This module protects a connected load from reverse voltages down to -60 V. This version acts as an ideal diode, blocking reverse current from output to input.

Operating voltage¹	Max current	Resistance²	Reverse current blocking	Size
4 V – 60 V	12 A	< 5 mΩ	yes (ideal diode)	0.3″×0.5″

Note 1: Operates down to 3.2 V after startup.

Note 2: MOSFET on resistance.

Pololu Reverse Voltage Protectors are compact modules that can be inserted between a power supply and its load to protect that load from damage in the case of accidental reversal of power polarity. They operate from 4 V (3.2 V after startup) to 60 V and provide protection from negative voltages down to -60 V. They are available in different power levels and with or without reverse current blocking:

Function	Max current	MOSFET on resistance	Size	Price	Pololu Item #

Reverse voltage protection only	10 A	< 10 mΩ	0.3″×0.5″	$3.29	#5380
	12 A	< 5 mΩ	0.3″×0.5″	$4.39	#5381
	20 A	< 3 mΩ	0.435″×0.7″	$5.95	#5386
	25 A	< 1.5 mΩ	0.435″×0.7″	$7.95	#5387

Reverse voltage and current protection (ideal diode)	10 A	< 10 mΩ	0.3″×0.5″	$3.79	#5382
	12 A	< 5 mΩ	0.3″×0.5″	$4.95	#5383
	20 A	< 3 mΩ	0.435″×0.7″	$6.49	#5388
	25 A	< 1.5 mΩ	0.435″×0.7″	$8.49	#5389

Ideal diode pair for ORing power	6 A per channel	< 10 mΩ	0.75″×0.775″	$7.95	#5398

The versions without reverse current blocking are suitable for applications such as battery-powered motor control where the ability to deliver energy back into the supply is desirable. The versions with reverse current blocking act as ideal diodes, preventing any current from flowing from the load back into the supply.

Pololu Reverse Voltage Protectors are available in 20A/25A (left) and 10A/12A (right) versions.

Size comparison of the 20A/25A (top) and 10A/12A (bottom) Pololu Reverse Voltage Protectors.

Pololu Power ORing Ideal Diode Pair, 4-60V, 6A.

Note: Any voltage on the output will reduce the 60 V maximum rating. For example, if there is a large capacitor charged to 24 V on the ouput, the minimum negative voltage would be -36 V.

Details for item #5383:

Pololu Ideal Diode Reverse Voltage Protector, 4-60V, 12A, top view.

Pololu 10A/12A Reverse Voltage Protector/Ideal Diode Reverse Voltage Protector, bottom view.

This module uses an LM74700-Q1 reverse voltage protection ideal diode controller and N-channel MOSFET to provide protection from negative voltages down to -60 V. It operates from 4 V (3.2V after startup) to 60 V and has a VIN path impedance of approximately 5 mΩ when the MOSFET is on (i.e. when power is connected with the proper polarity), enabling currents up to around 12 A continuous (and up to around 40 A for a few seconds). This version acts as an ideal diode, blocking reverse current from output to input.

Operating voltage	Max current	MOSFET on resistance	Reverse current blocking	Size
4 V – 60 V^*	12 A	< 5 mΩ	yes (ideal diode)	0.3″×0.5″
^* Operates down to 3.2 V after startup.

Connections:

Supply power and ground connect to the VIN and GND side of the board, and the VOUT and GND pins connect to the load. If the supply is connected correctly, with its positive voltage on VIN, the power will pass through the board to VOUT. If the supply is connected incorrectly, with the positive voltage on GND, supply power will not pass through to the output, and any connected load will be protected from the reversed supply voltage.

The input and output slots can accommodate a variety of connectors, including 5mm-pitch terminal blocks, 3.5mm-pitch terminal blocks, 0.2″-pitch headers, and 0.1″-pitch headers.

Examples of various connectors that can be used with the Pololu 10A/12A Reverse Voltage Protectors (from left to right: 5mm terminal blocks, 3.5mm terminal blocks, 0.1″ headers).

Pololu 10A/12A Reverse Voltage Protector soldered to a pair of two-pin, 5mm-pitch screw terminal blocks (not included).

Pololu 10A/12A Reverse Voltage Protector soldered with 0.1″ male headers (not included) for use in a breadboard.

Optional TVS diode mounting location

There are pads for adding an optional SMB-size transient voltage suppressor (TVS) across VIN and GND on the bottom side of the board:

We can manufacture these with the TVS diode of your choice for custom high-volume orders (typically at least a few hundred pieces). If you are interested in such a customization, please contact us for a quote.

Schematic: