# Reverse polarity protection module, MOSFET, 3–28V, 12A

> MOSFET-based reverse polarity protection module, part number 88230. Operates between 3 and 28 VDC, supports continuous current up to 12A (peak 15A), with a voltage drop below 50 mV and MOSFET internal resistance below 5 mΩ. Response time under 1 μs. Dimensions 12x22 mm. Pins: B+/B- input, V+/V- protected output. Suitable for batteries, DC power supplies, solar panels and development boards.

- Page: https://sigmanortec.ro/en/reverse-polarity-protection-module-mosfet-328v-12a
- Price: 10.25 RON
- Availability: In stock; 1-2 zile
- Reference: 88230 · EAN: 5942239367330
- Category: Electronic components > Protection Module
- Specifications: Supply Voltage: 3; Maximum Input Voltage: 28; Maximum Output Current: 12; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.; Switching technology: MOSFET
- Updated: 2026-06-10
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 04:14 (Europe/Bucharest)

## Description

Protects equipment quickly against reverse power connection, using a MOSFET with minimal losses. It operates between 3 and 28 VDC, supports up to 12A continuous, offers a very low voltage drop below 50 mV, and an ultra-fast response under 1 us. Its compact 12x22 mm size makes it easy to integrate into projects with batteries, DC power supplies, and development boards.
The reverse polarity protection module is a compact and efficient solution for protecting sensitive electronic equipment against incorrect power supply connection.
Based on a power MOSFET transistor with an extremely low internal resistance, below 5 mΩ, the module introduces a negligible voltage drop in the circuit, below 50 mV at maximum load, which practically eliminates energy losses and the risk of overheating.
It operates over a wide voltage range, from 3 to 28 VDC, and supports a continuous current of up to 12 A, with peaks of up to 15 A, making it suitable for both medium-power applications and more demanding circuits. The response time of under 1 μs ensures instant protection: when the polarity is connected correctly, current flows freely to the load, and if the terminals are accidentally reversed, the module completely blocks current flow, preventing any damage to downstream components.
Thanks to its compact 12 x 22 mm size, it can be easily integrated into any project, regardless of available space. The module is compatible with any DC power supply within the specified voltage range, including batteries, rechargeable cells, solar panels, or laboratory power supplies, and can be used together with Arduino, ESP32, STM32 development boards, or any other electronic platform that requires reverse polarity protection.
Specifications:
Operating voltage: 3 – 28 VDC
Maximum current (continuous): 12 A
Peak current: 15 A
Voltage drop at maximum load: < 50 mV
MOSFET internal resistance: < 5 mΩ
Response time: < 1 μs
Dimensions: 12 x 22 mm
Layout:
Pin
Signal
Description
B+
Input +
Battery / power supply positive
B-
Input -
Battery / power supply negative
V+
Output +
Protected output positive
V-
Output -
Protected output negative
Usage:
Connect the positive terminal of the power supply (battery, rechargeable cell, solar panel) to pin B+ and the negative terminal to pin B-.
Connect the load (the circuit that needs to be protected) to terminals V+ and V-, respecting polarity.
Check the connections before powering the circuit.
When connected correctly, the module allows current to pass freely to the load with no intervention.
In the event of accidental reversal of the power supply polarity, the module automatically blocks the current, protecting the load connected at the output.
No additional configuration is required; the module operates passively, without external components.
Dimensions diagram: