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5B42:  Isolated Current Input with loop power Signal Conditioning Module

Product Details

Model 5B42 interfaces with 2-wire transmitters to convert their 4-to-20 mA process current signal into a high accuracy output of +1 V to +5 V or +2 V to +10 V. The module provides 1500 V isolation with 140 dB CMR, 20 V regulated loop power (at a 4-to-20 mA loop current), signal filtering, and input protection against accidental line voltage connection. The industry standard 5B Series encapsulated plug-in modular package is compatible with all 5B backplanes. Modules are powered by +5 V dc, ±5%.

Signal isolation is provided by transformer coupling using a proprietary technique for linear, stable performance. A demodulator on the output side of the signal transformer recovers the input signal, which is filtered and buffered to provide an accurate, low impedance, low noise output.

True three-port isolation includes common-mode voltage of: 1500 V rms between input and output, and between input and power; 250 V rms between output and power.

Accurate performance is maintained over a wide –40°C to +85°C operating temperature range. The 5B42’s low drift design achieves an output offset drift of only ±5 µV/°C and gain drift of ±25 ppm/°C.

The 5B42 offers significant advantages over signal conditioners that require an external current sense resistor. An external resistor is not protected from accidental connection to ac line voltages, and its error tolerance must be added to the conditioner’s specified errors.

The 5B42 is trimmed and specified including its internal 25 ohm current-sense input resistor. The 5B42 signal input, loop supply and the sense resistor are all protected against accidental application of voltages, such as an ac power line, up to 240 V rms continuous. There is no need to install an external resistor on the backplane, but if one is installed, it has no effect on the 5B42 performance.

The module has a –3 dB bandwidth of 100 Hz, an optimized 5-pole signal filter with low overshoot and exceptional output noise performance of 200 µV peak-to-peak at 100 kHz bandwidth.

The 5B42 logic-controlled series output switch eliminates the need for external multiplexing in many applications. This low output resistance switch is controlled by an active low enable input. When the output switch is not used, ground the enable input to I/O common to turn on the switch.


  • Accepts Tramsmitter Input (0-20 or 4-20mA)
  • Provides Transmitter Loop Power
  • 100 Hz BW
  • 1-5V or 2-10V Output

Functional Block Diagram for 5B42


Title Content Type File Type
5B42: Isolated, Process Current Input Data Sheet (Rev 0, 01/1999) (pdf, 688 kB) Data Sheets PDF
AN-529: 5B Series Signal Conditioning Subsystems in RFI/EMI Fields  (pdf, 24 kB) Application Notes PDF
AN-535: Digital Input/Output Subsystems  (pdf, 336 kB) Application Notes PDF
AN-533: Applying 5B Series Backplanes and Mounting Cards  (pdf, 145 kB) Application Notes PDF
AN-530: Narrow or Wide Bandwidth 5B Series Input Modules: Which is the Right Choice?  (pdf, 18 kB) Application Notes PDF
AN-528: Design Considerations for Designing a 5B Series System  (pdf, 16 kB) Application Notes PDF
5B Series Manual  (pdf, 2274 kB) User Guides PDF
Make vs. Buy! When Should I Reinvent the Wheel?
(Analog Dialogue, Vol. 33, No. 10, November-December, 1999)
Analog Dialogue HTML
5B Series Backplanes and Mounting Cards Backplanes HTML
5B Series Custom Configuration Ranges Configuration Guides HTML
5B Series Configuration Guide Configuration Guides HTML
IOS Custom Product Worksheet
As a Design Subcontractor, IOS believes it essential to engage with our customers early in the development cycle. Complete the form and it will be reviewed and you will be contacted by one of our design specialists.
Custom Product Worksheet HTML
5B Series Accessories Accessories HTML
5B Series Power Supplies Power Supplies HTML
Selecting the Right Signal Conditioning Series for Your Application Overview HTML
All Series Modules Overview HTML
IOS 3 Year Warranty  (pdf, 23 kB) Overview PDF
5B Series Overviews Overview HTML
IOS Short Form Brochure  (pdf, 2298 kB) Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
5B I/O Subsystem Software Tools
  • 5BCUSTOM.ZIP  (zip, 2111 kB)
    5B Custom Program for Windows 3.1. 5B Custom program assists users of 5B Series of signal conditioners in selecting Custom-Ranged 5B Modules. The program also lists general 5B information, ranges, application notes, etc... [D/L Time 22.5 min @ 14.4Kbps]. 2162562 01-22-96
    Steps on how to deal with noise with the 5B modules. 4096 10-27-93 (txt, 4,096 bytes)
    Windows Conversion Utility Program for common temperature sensing devices. Sensors (Ver 1.2) Dated: Feb 15, 1994. 351525 08-24-95 (zip, 351,525 bytes)
    Simple steps explaining Temperature Conversion for our Thermocouple Modules (3B, 5B, 7B). 1920 07-09-93 (txt, 2,136 bytes)
I/O Subsystem Software Tools HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

5B42 Model Options
Model Package Pins Temp.
Price RoHS View PCN/ PDN Check Inventory/
5B42-01 Status: Production IOS MODULE 14 Comm. Tray, 1 - N  Material Info Notify Me Purchase
5B42-02 Status: Production IOS MODULE 14 Comm. Tray, 1 - N  Material Info Notify Me Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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