The TPS2661x is a compact, feature-rich, fully integrated current loop protector suitable for analog inputs, analog outputs, sensor transmitters, HART inputs, and UART IO protection. The device provides universal input protection for ±20 mA, 0 mA to 20 mA, and 4 mA–20 mA. Low RON values of 7.5 Ω minimizes drop in the current loop, thereby extending operating range and supporting operation even with lower voltage power supplies. The device can withstand and protect the loads from positive and negative supply voltages up to ±50 V. The MODE pin allows flexibility to enable 2x current limit through the device to enable proper start-up of two wire transmitters. Device is capable of operating from an external bipolar supply as low as ± 2.25 V to ±20 V. The device can also be powered from unipolar supplies as low as 3 V to 30 V. The TPS26610 and TPS26613 feature loop power mode to facilitate loop testing in un-powered state without ±Vs supplies.
The device also protects the system from output side miswiring in analog outputs and sensor transmitters by turning off the current path. The internal robust protection control blocks along with the 50-V rating of the TPS2661x help to protect against surge (IEC61000-4-5) and EFT (IEC61000-4-4) transients for signal lines. The device greatly reduces system footprint by its 2.9-mm × 1.6-mm 8-pin SOT-23 package.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | TPS2661x: 50-V, Universal 4–20 mA, ±20-mA Current Loop Protector With Input and Output Miswiring Protection datasheet (Rev. C) | PDF | HTML | 08 Dec 2021 |
| Circuit design | Output Overvoltage Protection Circuit for Voltage DACs Without an External Feedback Pin | PDF | HTML | 18 Jun 2025 | |
| Certificate | TPS2661 UL2367 Certificate of Compliance E169910 | 09 Feb 2023 | ||
| Application note | Cost-Optimized, High-Performance Front-End Design for Analog Input Modules | PDF | HTML | 22 Jun 2022 | |
| Application note | Protection for HART I/O in Analog Input and Output Modules with TPS2661x | PDF | HTML | 09 Sep 2021 | |
| Application note | New Approach to Protect 4–20 mA, ±20-mA Analog Input | PDF | HTML | 06 Jul 2021 | |
| Certificate | TPS2661EVM EU RoHS Declaration of Conformity (DoC) (Rev. A) | 17 Feb 2021 | ||
| Application note | Enabling Smarter, Integrated Protection for 4-20mA Current Loops with eFuses | PDF | HTML | 11 Dec 2020 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23-THN (DDF) | 8 | Ultra Librarian |
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