# 3v3 Sustain for Raspberry Pi

**Type:** Product page · **SKU:** CE08446 · **Brand:** [The Pi Hut](https://core-electronics.com.au/brands/the-pi-hut)
**Page:** https://core-electronics.com.au/3v3-sustain-for-raspberry-pi.html ([markdown](https://core-electronics.com.au/3v3-sustain-for-raspberry-pi.html.md))

When rebooting a Raspberry Pi 4, the 3.3V rail is reset which causes problems for some HATs and projects. The 3v3 Sustain solves this problem! The board...

## Pricing

- **Price:** $8.60 (inc GST) — $7.82 AUD, exc GST
- **Quantity discounts:** 10+ $7.51 (exc GST) · 25+ $7.27 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 28 and Aug 31.

## Description

When rebooting a Raspberry Pi 4, the 3.3V rail is reset which causes problems for some HATs and projects.

The 3v3 Sustain solves this problem! The board fits in between a Raspberry Pi and a HAT/pHAT and provides a stable 3.3V (300mA max) during reboots.

It also has a cutout to help keep the Pi 4 cooler (can be used with the [Pimoroni Fan Shim](https://core-electronics.com.au/fan-shim-for-raspberry-pi) or similar).

**Example use**

One of the features added to the [Cluster HAT v2.x](https://core-electronics.com.au/cluster-hat-v2-0) was to allow the controller Pi to reboot without powering off the Pi Zeros. With the Raspberry Pi 4, this no longer works as once the 3.3V rail is reset, the I/O expander loses power and powers off the Pi Zeros.

**Contents**

- Pre-soldered 3v3 Sustain PCB
- 4x 12mm M2.5 spacers
- 8x 6mm M2.5 screws
 
**Note**: Raspberry Pi 4, ClusterHAT and Fan Shim not included

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/i/m/image_13276.jpg)