Product details


FET Internal Vin (Min) (V) 4.5 Vin (Max) (V) 18 Vabsmax_cont (V) 20 Current limit (Min) (A) 0.4 Current limit (Max) (A) 1.6 UL recognition Yes Overcurrent response Current Limiting Current limit type Adjustable Fault response Latch Off Current limit function enabled Always Ron (Typ) (mOhm) 90 Rating Catalog Operating temperature range (C) -40 to 85 open-in-new Find other eFuses & hot swap controllers

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 open-in-new Find other eFuses & hot swap controllers


  • 4.5 V – 18 V Operating Voltage, 20 V (Max)
  • 90 mΩ RDS(ON) (Typical)
  • 0.4 A to 1.6 A Adjustable Current Limit
  • ±2% Accurate ILIMIT at 1A at 25°C
  • ±3% Overvoltage, Undervoltage Threshold
  • Programmable dVO/dt Control
  • Fault Output for Thermal Shutdown, UVLO and
  • –40°C to 125°C Junction Temperature Range
  • Auto-Retry and Latch-Off Versions
  • UL2367 Recognized - File No. E169910
  • UL60950 - Safe during Single Point Failure Test
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The TPS25921 is a compact, feature rich eFuse with a full suite of protection functions. The wide operating voltage allows control of many popular DC buses. The precise ±2% current limit, at room temperature, provides excellent accuracy making the TPS25921 well suited for many system protection applications.

Load, source and device protection are provided with multiple programmable features including overcurrent, overvoltage and undervoltage. 3% threshold accuracy for UV and OV, ensures tight supervision of bus voltages, eliminating the need for supervisor circuitry. Fault flag output (FLT) is provided for system status monitoring and down stream load control.

For hot-plug-in boards, TPS25921 provides in-rush current control and programmable output ramp-rate. Output ramp rate is programmable using a capacitor at soft-start (SS) pin, for maximum design flexibility.

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Same functionality and pinout but is not an equivalent to the compared device:
TPS2596 ACTIVE 2.7-V to 19-V, 85mΩ, 0.13-2A eFuse with selectable over voltage protection clamp in leaded This product is an EFT tolerant eFuse with high accuracy at very low current limit settings.

Technical documentation

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Type Title Date
* Datasheet TPS25921x 4.5V - 18V eFuse with Precise Current Limit and Over Voltage Protection datasheet (Rev. C) Nov. 11, 2015
Application notes eFuse: Safety Certification and why it Matters Mar. 18, 2020
More literature TPS25921x UL Certificate of Compliance IEC 62368-1 Jan. 17, 2020
Application notes Basics of eFuses (Rev. A) Apr. 05, 2018
Technical articles How can a load switch extend your device’s battery life? Mar. 20, 2018
Technical articles How and why you should use load switches for power sequencing Feb. 06, 2018
Technical articles How to use load switches and eFuses in your set-top box design Nov. 23, 2017
Technical articles Don’t leave it floating! Power off your outputs with quick output discharge Dec. 09, 2016
User guides User Guide for TPS25921EVM-637 Aug. 04, 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The TPS25921xD eFuses are highly integrated circuit protection and power management solution in a small package. These devices use few external components and provide multiple protection modes, along with providing  a robust defense against overloads, shorts circuits, voltage surges and (...)

  • 4.5V to 18V operating voltage range  eFuse
  • Up to 1.5A Adjustable ILIMIT setting option using Jumper
  • On board fault and power good LEDs
  • Linear output ramp (gate dV/dt control) option
  • On board test point access for all device level pins

Design tools & simulation

SLVMAE7B.ZIP (99 KB) - PSpice Model
SLUC573.ZIP (72 KB)

Reference designs

Flat-Clamp TVS based Reference Design for Protection Against Transient for Grid Applications
TIDA-010008 — This reference design features multiple approaches for  protecting AC or DC analog input, DC analog output, AC or DC binary input, digital output with a high side or low side driver, LCD bias supply, USB interfaces (power and data) and onboard power supplies with 24, 12 or 5V input used in (...)
document-generic Schematic document-generic User guide
12-V, 15-W Power limit, single driver-based stepper, brushed DC and actuator drive reference design
TIDA-010004 — This reference design demonstrates a multi-load drive using one driver chip in multiple configurations enabling reduced inventory. The multiple loads include one bipolar stepper motor, one brushed DC motor, and three actuator or solenoid loads driven from a 12-V DC supply. The design shows less than (...)
document-generic Schematic document-generic User guide
High accuracy split-phase CT electricity meter reference design using standalone ADCs
TIDA-010037 — This reference design implements Class 0.1 split-phase energy measurement using high-performance, multi-channel analog-to-digital converters (ADC). The independent ADC samples the output of current transformers (CT) at 8 kHz to measure the current and voltage of each leg of the AC mains. The (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options

Ordering & quality

Support & training

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Understanding circuit protection solutions: eFuses vs. discrete protection circuits

In this video, learn how eFuse solutions overcome the limitations of discrete solutions while meeting circuit protection requirements.

Posted: 21-Jan-2017
Duration: 02:56

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