{"product_id":"mtl5045-mtl-5000-series-analog-signal-isolator-current-loop-interface","title":"MTL5045 MTL 5000 Series Analog Signal Isolator Current Loop Interface","description":"\u003ch2\u003eMTL5045 | MTL 5000 Series 4–20 mA Hazardous-Area Signal Isolator\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eMTL5045\u003c\/strong\u003e transfers a 4–20 mA control signal from safe-area equipment to a load located in a hazardous area. Its single-channel design supports an output load of up to \u003cstrong\u003e800 Ω\u003c\/strong\u003e, delivering 16 V at 20 mA while keeping the input voltage drop below 4 V at 20 mA.\u003c\/p\u003e\n\n\u003cp\u003eFor control engineers, the key selection factors are loop compliance voltage, output load resistance, hazardous-area certification, and supply voltage. The MTL5045 also provides a green power LED, low signal ripple, and a specified transfer accuracy better than 20 µA at 20°C.\u003c\/p\u003e\n\n\u003ch3\u003eSignal Path at a Glance\u003c\/h3\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSignal-path stage\u003c\/th\u003e\n\u003cth\u003eMTL5045 function\u003c\/th\u003e\n\u003cth\u003eCommissioning check\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafe-area input\u003c\/td\u003e\n\u003ctd\u003eAccepts a 4–20 mA signal, with an under\/over-range span of 0–24 mA\u003c\/td\u003e\n\u003ctd\u003eConfirm controller output type, polarity, and available compliance voltage.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation and transfer\u003c\/td\u003e\n\u003ctd\u003eTransfers the current signal through the isolator interface\u003c\/td\u003e\n\u003ctd\u003eCheck supply voltage, wiring, and channel condition.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHazardous-area output\u003c\/td\u003e\n\u003ctd\u003eDrives a load up to 800 Ω, rated at 16 V at 20 mA\u003c\/td\u003e\n\u003ctd\u003eCalculate the total loop load and confirm the receiving device's requirements.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower indication\u003c\/td\u003e\n\u003ctd\u003eGreen LED indicates power\u003c\/td\u003e\n\u003ctd\u003eUse the LED as a supply-status clue, not proof of correct signal transfer.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eElectrical Specifications\u003c\/h2\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eMTL5045\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of channels\u003c\/td\u003e\n\u003ctd\u003eOne\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafe-area input signal\u003c\/td\u003e\n\u003ctd\u003e4–20 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput under\/over-range\u003c\/td\u003e\n\u003ctd\u003e0–24 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHazardous-area output load\u003c\/td\u003e\n\u003ctd\u003eMaximum 800 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput drive capability\u003c\/td\u003e\n\u003ctd\u003e16 V at 20 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput resistance\u003c\/td\u003e\n\u003ctd\u003eGreater than 2 MΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput voltage drop\u003c\/td\u003e\n\u003ctd\u003eLess than 4 V at 20 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput\/output circuit ripple\u003c\/td\u003e\n\u003ctd\u003eLess than 40 µA peak-to-peak\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransfer accuracy at 20°C\u003c\/td\u003e\n\u003ctd\u003eBetter than 20 µA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature drift\u003c\/td\u003e\n\u003ctd\u003eLess than 1 µA\/°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResponse time\u003c\/td\u003e\n\u003ctd\u003eSettles within 10% of final value in 250 µs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply voltage\u003c\/td\u003e\n\u003ctd\u003e20–35 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum current consumption\u003c\/td\u003e\n\u003ctd\u003e50 mA at 24 V; 60 mA at 20 V; 40 mA at 35 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum internal power dissipation\u003c\/td\u003e\n\u003ctd\u003e1.0 W at 24 V; 1.1 W at 35 V, with a 20 mA signal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety description\u003c\/td\u003e\n\u003ctd\u003e28 V, 300 Ω, 93 mA; Um = 250 V RMS or DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower LED\u003c\/td\u003e\n\u003ctd\u003eGreen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eTerminal Assignment and Wiring Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse the terminal numbers below to verify the field wiring against the applicable MTL5045 installation drawing. Isolate the circuit and follow site safety procedures before changing connections.\u003c\/p\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eTerminal\u003c\/th\u003e\n\u003cth\u003eFunction\u003c\/th\u003e\n\u003cth\u003eConnection purpose\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003eOutput −ve\u003c\/td\u003e\n\u003ctd\u003eNegative output connection to the hazardous-area load circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eOutput +ve\u003c\/td\u003e\n\u003ctd\u003ePositive output connection to the hazardous-area load circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003ctd\u003eInput −ve\u003c\/td\u003e\n\u003ctd\u003eNegative safe-area current input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003eInput +ve\u003c\/td\u003e\n\u003ctd\u003ePositive safe-area current input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003ctd\u003eSupply −ve\u003c\/td\u003e\n\u003ctd\u003eNegative DC supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003eSupply +ve\u003c\/td\u003e\n\u003ctd\u003ePositive DC supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eWiring reminder:\u003c\/strong\u003e Do not interchange the input, output, and supply terminals. Confirm polarity and terminal numbering on the actual unit before energizing the circuit. The terminal table is a reference, not a substitute for the manufacturer's approved wiring diagram.\u003c\/p\u003e\n\n\u003ch2\u003eLoad Selection: Check the 800 Ω Limit\u003c\/h2\u003e\n\n\u003cp\u003eThe MTL5045 can drive a maximum load of 800 Ω at 20 mA, with a specified output capability of 16 V. The total load must include the receiving instrument and the resistance contributed by field wiring and other series components.\u003c\/p\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eExample load\u003c\/th\u003e\n\u003cth\u003eVoltage required at 20 mA\u003c\/th\u003e\n\u003cth\u003eSelection implication\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e250 Ω\u003c\/td\u003e\n\u003ctd\u003e5 V\u003c\/td\u003e\n\u003ctd\u003eBelow the specified maximum load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e500 Ω\u003c\/td\u003e\n\u003ctd\u003e10 V\u003c\/td\u003e\n\u003ctd\u003eBelow the specified maximum load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e800 Ω\u003c\/td\u003e\n\u003ctd\u003e16 V\u003c\/td\u003e\n\u003ctd\u003eAt the stated maximum output load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAbove 800 Ω\u003c\/td\u003e\n\u003ctd\u003eMore than 16 V at 20 mA\u003c\/td\u003e\n\u003ctd\u003eOutside the stated load rating; reassess the circuit design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eUse Ohm's law to estimate the load voltage: \u003cstrong\u003eV = I × R\u003c\/strong\u003e. At 20 mA, an 800 Ω load requires 16 V. Keep the total resistance within the specified limit and confirm that the receiving device can accept the resulting signal.\u003c\/p\u003e\n\n\u003ch2\u003eWhere the MTL5045 Fits\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePLC or DCS analog output to a hazardous-area load:\u003c\/strong\u003e Transfers a safe-area 4–20 mA control signal to a suitable field load when the installation meets the required intrinsic-safety conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl valves and field actuators:\u003c\/strong\u003e Potentially suitable for compatible current-driven devices whose required signal, load, and certification match the interface specification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProcess-control skids:\u003c\/strong\u003e Provides a single-channel interface for analog control loops routed between safe and hazardous areas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial signal-interface cabinets:\u003c\/strong\u003e Fits applications that require a defined 4–20 mA transfer path and a 20–35 V DC supply.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eConfirm the field load type before installation. A 4–20 mA signal interface is not automatically compatible with every positioner, actuator, indicator, or transmitter. Verify whether the receiving device expects a current input, the required loop direction, and the applicable hazardous-area approval.\u003c\/p\u003e\n\n\u003ch2\u003eHazardous-Area Suitability and Safety Parameters\u003c\/h2\u003e\n\n\u003cp\u003eThe supplied specification identifies the load location as Zone 0, IIC, T4–T6 hazardous area when suitably certified, and Division 1, Group A hazardous location. The listed safety description is \u003cstrong\u003e28 V, 300 Ω, 93 mA\u003c\/strong\u003e, with \u003cstrong\u003eUm = 250 V RMS or DC\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eVerify the exact MTL5045 certification and the approval applicable to the installation jurisdiction.\u003c\/li\u003e\n\u003cli\u003eCheck the field device's entity parameters and the complete intrinsically safe loop design against the manufacturer's documentation.\u003c\/li\u003e\n\u003cli\u003eConfirm cable parameters, grounding requirements, and installation drawings before energizing the circuit.\u003c\/li\u003e\n\u003cli\u003eDo not assume that a generic model description alone establishes suitability for a particular gas group, temperature class, or Zone 0 installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eField Diagnostics: Symptoms, Causes and Checks\u003c\/h2\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eObserved symptom\u003c\/th\u003e\n\u003cth\u003ePossible cause\u003c\/th\u003e\n\u003cth\u003eRecommended diagnostic action\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo output current\u003c\/td\u003e\n\u003ctd\u003eMissing supply, incorrect terminal wiring, open loop, or input signal absent\u003c\/td\u003e\n\u003ctd\u003eCheck the green power LED, verify supply voltage at terminals 13 and 14, then measure the input signal using an approved method.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput remains below the commanded value\u003c\/td\u003e\n\u003ctd\u003eExcessive loop resistance, incorrect polarity, or receiving-device loading\u003c\/td\u003e\n\u003ctd\u003eCalculate total loop resistance and confirm that the load does not exceed 800 Ω at 20 mA.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReading fluctuates\u003c\/td\u003e\n\u003ctd\u003eUnstable controller output, loose connections, electrical interference, or poor wiring practices\u003c\/td\u003e\n\u003ctd\u003eCompare the safe-area input with the hazardous-area output and inspect terminals, cable routing, and shielding according to the installation design.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent is correct at the input but incorrect at the load\u003c\/td\u003e\n\u003ctd\u003eOutput-side wiring fault, excessive load, or a damaged interface\u003c\/td\u003e\n\u003ctd\u003eCheck the output loop independently and compare measurements with the receiving instrument's input requirements.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal error changes with ambient temperature\u003c\/td\u003e\n\u003ctd\u003eTemperature drift or a temperature-related fault elsewhere in the loop\u003c\/td\u003e\n\u003ctd\u003eCompare the observed change with the specified drift of less than 1 µA\/°C and inspect the complete loop before attributing the fault to the isolator.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower LED is on but the signal is wrong\u003c\/td\u003e\n\u003ctd\u003eInput, output, polarity, load, or receiving-device issue\u003c\/td\u003e\n\u003ctd\u003eRemember that the LED indicates power only. Verify input current, output current, wiring, and load resistance separately.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003ePractical troubleshooting sequence:\u003c\/strong\u003e Verify the DC supply first, then measure the safe-area input, check the hazardous-area loop and total load, and finally confirm the receiving device's configuration. Follow hazardous-area procedures and use appropriately rated test equipment; never bypass required intrinsic-safety protection to troubleshoot a live circuit.\u003c\/p\u003e\n\n\u003ch2\u003eGlobal PLC Spare HUB's Insight\u003c\/h2\u003e\n\n\u003cp\u003eFor the MTL5045, a common selection mistake is checking only the nominal 4–20 mA range without verifying the load and voltage budget. At 20 mA, an 800 Ω load requires 16 V, which matches the stated output capability. A higher resistance can prevent the output from reaching the commanded current.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eValidate the loop budget:\u003c\/strong\u003e Include the receiving device, cable resistance, and any other series elements when calculating total load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeparate supply checks from signal checks:\u003c\/strong\u003e A green LED confirms power indication, but does not prove correct current transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse the terminal numbers carefully:\u003c\/strong\u003e Input, output, and supply connections have distinct terminal pairs. Verify polarity before energizing the unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfirm hazardous-area compatibility:\u003c\/strong\u003e Select the interface based on the complete loop approval and field-device requirements, not the area classification alone.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompare input and output measurements:\u003c\/strong\u003e This helps distinguish a controller-side issue from a load, wiring, or interface-side problem.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eGlobal PLC Spare HUB can help customers review the part number, current-loop requirements, load resistance, and application details before ordering industrial automation interface components.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty and Shipping\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct condition:\u003c\/strong\u003e New, original item, subject to order confirmation and availability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 12-month warranty against qualifying product defects, subject to applicable sales terms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping methods:\u003c\/strong\u003e FedEx, UPS, and DHL, subject to destination and service availability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrder verification:\u003c\/strong\u003e Confirm the exact model, quantity, destination, and any required compliance documentation before dispatch.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003e1. Can the MTL5045 drive a 4–20 mA load that requires more than 16 V at 20 mA?\u003c\/h3\u003e\n\u003cp\u003eThe stated output capability is 16 V at 20 mA, corresponding to a maximum load resistance of 800 Ω. If the complete loop requires more voltage, the application falls outside the stated load capability. Recalculate the load and review the receiving device's input requirements before selecting an interface.\u003c\/p\u003e\n\n\u003ch3\u003e2. What is the practical difference between the 0–24 mA input range and the normal 4–20 mA signal?\u003c\/h3\u003e\n\u003cp\u003eThe normal operating signal is 4–20 mA. The stated 0–24 mA range describes the specified under\/over-range span, not a replacement for the normal control range. Confirm how the controller and receiving device interpret underrange and overrange values before using them for alarms or fault logic.\u003c\/p\u003e\n\n\u003ch3\u003e3. If the green LED is on, does that prove the hazardous-area output is healthy?\u003c\/h3\u003e\n\u003cp\u003eNo. The green LED indicates power. It does not confirm that the input signal reaches the output correctly or that the load is within specification. Compare the input and output current, inspect terminal polarity, and verify the total loop resistance.\u003c\/p\u003e\n\n\u003ch3\u003e4. How should I choose this model for a control valve or positioner?\u003c\/h3\u003e\n\u003cp\u003eStart by confirming that the field device accepts a 4–20 mA current input and determine its required voltage and input resistance. Then check the total load against the 800 Ω limit, verify the required hazardous-area certification, and confirm whether the application needs this particular signal-transfer arrangement.\u003c\/p\u003e\n\n\u003ch3\u003e5. What should I provide when asking for a replacement or compatibility check?\u003c\/h3\u003e\n\u003cp\u003eProvide the full model number, controller or output-card model, receiving-device model, measured or specified loop resistance, supply voltage, hazardous-area classification, and wiring arrangement. These details help determine whether the interface fits the circuit and whether the required approvals and load limits are satisfied.\u003c\/p\u003e","brand":"MTL","offers":[{"title":"Default Title","offer_id":45014020325558,"sku":"MTL5045","price":143.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/MTL5045-1.jpg?v=1792051443","url":"https:\/\/www.plcsparehub.com\/products\/mtl5045-mtl-5000-series-analog-signal-isolator-current-loop-interface","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}