# FlexTrip: Adjustable Current e-Fuse 3-22 V, 5.5 A

3-22 V Unidirectional Electronic Fuse (e-Fuse) with Latch-off Circuit Breaker functionality operating up to 5 A continuously.

- **Seller:** [PN Labs](https://lectronz.com/stores/pnlabs), Montreal, Quebec, Canada
- **Price:** $20.99 (USD, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Prototyping, Power, Power management
- **HS code:** 85363080
- **Product page:** https://lectronz.com/products/flextrip-adjustable-current-e-fuse-3-22-v-55-a

## Links

- [Documentation](https://pnlabs.ca/wp-content/uploads/2026/01/FlexTrip-Datasheet.pdf)

## Images

![FlexTrip: Adjustable Current e-Fuse 3-22 V, 5.5 A](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NDQ5NTcsInB1ciI6ImJsb2JfaWQifX0=--a8c71cf8c655a9383b01bcfda5ee039698ac80a7/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJwbmciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--605f1da017bcbb03ce31845cd0e81d97e3b3c574/2025-08-02T05-3A25-3A36.178Z-1.png)
![FlexTrip: Adjustable Current e-Fuse 3-22 V, 5.5 A](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NDQ5NTgsInB1ciI6ImJsb2JfaWQifX0=--00794b7308e067f2f41590a045d2452281a8efca/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJwbmciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--605f1da017bcbb03ce31845cd0e81d97e3b3c574/2025-08-02T05-3A25-3A36.178Z-2.png)
![FlexTrip: Adjustable Current e-Fuse 3-22 V, 5.5 A](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NDQ5NTksInB1ciI6ImJsb2JfaWQifX0=--54df61be679542f661d540de243943819e64618c/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJwbmciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--605f1da017bcbb03ce31845cd0e81d97e3b3c574/2025-08-02T05-3A25-3A36.178Z-3.png)
![FlexTrip: Adjustable Current e-Fuse 3-22 V, 5.5 A](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NDQ5NjAsInB1ciI6ImJsb2JfaWQifX0=--fb985ee5543f5da5bebfc79966aa819900d00299/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJwbmciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--605f1da017bcbb03ce31845cd0e81d97e3b3c574/2025-08-02T05-3A25-3A36.178Z-4.png)
![FlexTrip: Adjustable Current e-Fuse 3-22 V, 5.5 A](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NDQ5NzQsInB1ciI6ImJsb2JfaWQifX0=--12a8af5c75a25b4647178f4933ae096aa400528b/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJwbmciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--605f1da017bcbb03ce31845cd0e81d97e3b3c574/5.png)

## Description

The PN Labs FlexTrip is a highly capable unidirectional electronic fuse with ideal diode functionality, working from 3-22 V at currents of up to 5 A continuous. It can be used solely as an electronic fuse, to isolate multiple supplies in parallel, or to perform power multiplexing between multiple power sources using the Power Good (PG) and Reset (RST) signals.

Its features include:

- **Adjustable current** levels of 0.5, 1, 2, 3, 5, 5.5 A made by soldering an onboard jumper. The response time depends on the input voltage conditions and the amount of overcurrent. Typical response times are 0.1-1.5 seconds.
- **Low on-state resistance** of about 37 mOhm
- Wide **3-22 V operating voltage range**
- **Electrical Reset** (3-15 V on RST pin) and **Mechanical Reset** (button) available.
- an open-drain **Power Good (PG) signal** which is pulled up to Vcc
- **Thermal Shutdown feature and on-board SMD fuse**: In the event that the steady state current draw is exceeded and the board overheats, the IC has a thermal shutdown feature that will kick in around 140-150 C. Rest assured that there is also an 8 A series fuse on the module as a last resort in case a rapid power surge destroys the IC before the shutdown can respond.
- **Soft-start feature**: The power output gets ramped at around 1 V/ms into your circuit, which helps reduce inrush current on start up and provides a smooth turn-on.

**Overcurrent Response Behavior:**
The short circuit threshold is defined solely by soldering the corresponding solder jumper.

- If downstream loads attempt to exceed the set current limit, the device will actively regulate the input voltage in an attempt to not exceed the limit. If enough heat is dissipated in the device that its over-temperature feature activates, it will latch off. 

- If the overcurrent event is severe enough that it exceeds double the set current limit, the device will skip current limiting and immediately shut down, latching off. 


The module can be used to perform power multiplexing/power path control by sending a signal to the reset pin to turn the module on or off.

I made this module because electronic fuses offer a more reliable and convenient solution than conventional fuses, but there are surprisingly few electronic fuse boards available on the market today, and if they do exist, they are not rated for low voltages like 3 V and are very expensive.

This module is sold a pack of 2, and comes with all required header pins and terminal blocks.

## Shipping policy

Ships next business day if in-stock, through Canada's Postal service or UPS. Alternate shipping carriers available upon request.