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TPS2661

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50-V, universal 4-20-mA, ±20-mA current loop protector

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Data sheet

TPS2661

ACTIVE
Data sheet Order now

Product details

FET Internal Ron (Typ) (mOhm) 7500 Vin (Min) (V) -50 Vin (Max) (V) 50 Vabsmax_cont (V) 55 Current limit (Min) (A) 0.025 Current limit (Max) (A) 0.035 Overcurrent response Current limiting Fault response Auto Retry UL recognition —
FET Internal Ron (Typ) (mOhm) 7500 Vin (Min) (V) -50 Vin (Max) (V) 50 Vabsmax_cont (V) 55 Current limit (Min) (A) 0.025 Current limit (Max) (A) 0.035 Overcurrent response Current limiting Fault response Auto Retry UL recognition —
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SOT-23-THN (DDF) 8 8 mm² 2.9 x 2.8
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  • ±50-V operating voltage, ±55-V absolute maximum
  • Integrated fixed bipolar 32-mA current limit
  • Allows 2x current limit at start-up
  • 50% space savings compared to a typical discrete protection circuit
  • Low R-on: 7.5-Ω typical
  • Low IQ (< 100 nA) – current drawn from loop when powered from external supply
  • Protection against miswiring conditions on IN and OUT
  • Protection during signal line surge IEC61000-4-5 (with external TVS)
  • Criteria-A EFT (IEC61000-4-4) immunity (with external TVS)
  • Supports loop testing without supply (TPS26610 only)
  • HART compliant
  • Enable control
  • SGOOD for system health monitoring
  • Thermal shutdown
  • ±50-V operating voltage, ±55-V absolute maximum
  • Integrated fixed bipolar 32-mA current limit
  • Allows 2x current limit at start-up
  • 50% space savings compared to a typical discrete protection circuit
  • Low R-on: 7.5-Ω typical
  • Low IQ (< 100 nA) – current drawn from loop when powered from external supply
  • Protection against miswiring conditions on IN and OUT
  • Protection during signal line surge IEC61000-4-5 (with external TVS)
  • Criteria-A EFT (IEC61000-4-4) immunity (with external TVS)
  • Supports loop testing without supply (TPS26610 only)
  • HART compliant
  • Enable control
  • SGOOD for system health monitoring
  • Thermal shutdown
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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.

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.

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Technical documentation

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Type Title Date
* Data sheet TPS2661x: 50-V, Universal 4–20 mA, ±20-mA Current Loop Protector With Input and Output Miswiring Protection datasheet (Rev. C) 08 Dec 2021
User guide TPS2661EVM: Evaluation Module for TPS2661x Current-Loop Protector (Rev. B) 13 Dec 2021
Application note Protection for HART I/O in Analog Input and Output Modules with TPS2661x 09 Sep 2021
Application note New Approach to Protect 4–20 mA, ±20-mA Analog Input 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 11 Dec 2020
Functional safety information TPS266x Functional Safety FIT Rate and Failure Mode Distribution 16 Dec 2019

Design & development

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Evaluation board

TPS2661EVM — TPS2661x current loop protector evaluation module

The TPS2661EVM allows reference circuit evaluation of TPS26611 and TPS26612 current-loop protectors. The TPS2661 product is a 50-V, universal (±20-mA, 0-mA to 20-mA, 4-mA to 20-mA) current-loop protector with integrated fixed bipolar 30-mA current limit and output overvoltage (...)
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Simulation model

TPS2661 PSpice Transient Model (Rev. A)

SLVMDF3A.ZIP (135 KB) - PSpice Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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