# 3v3 Sustain for Raspberry Pi 4

Keep the 3.3v rail alive between reboots.

- **Seller:** [8086 Consultancy](https://lectronz.com/stores/8086net), Nottinghamshire, ENG, UK
- **Price:** €2.87 (EUR, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Raspberry Pi, Power management
- **Country of origin:** UK
- **HS code:** 8471800000
- **Product page:** https://lectronz.com/products/-3v3-sustain-for-raspberry-pi-4

## Images

![3v3 Sustain for Raspberry Pi 4](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NDg5ODksInB1ciI6ImJsb2JfaWQifX0=--e912fe564a84d9977e77ce05fa61a277e58de7d5/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2019-07-16T11-32-43.678Z-2019-07-16-2012.10.17.jpg)
![3v3 Sustain for Raspberry Pi 4](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NDg5OTAsInB1ciI6ImJsb2JfaWQifX0=--cad912c9298975d2879b39554b72420d21f4c671/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2019-07-16T11-32-43.678Z-2019-07-16-2012.12.37.jpg)
![3v3 Sustain for Raspberry Pi 4](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NDg5OTEsInB1ciI6ImJsb2JfaWQifX0=--746f3643d0a1c8c4e6dbf83ae255c34c942e6c11/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2019-07-16T11-32-43.678Z-2019-07-16-2012.14.45.jpg)
![3v3 Sustain for Raspberry Pi 4](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NDg5OTIsInB1ciI6ImJsb2JfaWQifX0=--a342f2dc1499b9ec1e339efed75884cf0c472208/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2019-07-16T11-32-43.678Z-2019-07-16-2012.17.18.jpg)

## Description

When rebooting a Raspberry Pi 4 the 3.3 volt rail is reset which causes problems for some HATs.

3v3 Sustain fits in between a Raspberry Pi and a HAT/pHAT and provides a stable 3.3 volts (300 mA max) during reboots.

**Example use**

One of the features added to the Cluster HAT v2.x was to allow the controller Pi to reboot without powering off the Pi Zeros. With the Pi 4 this no longer works for Cluster HAT v2.0 to v2.3 (resolved in v2.4 and above) as once the 3.3 volt rail is reset the I/O expander loses power and powers off the Pi Zeros.

It also has a cutout to help keep the Pi 4 cooler (can be used with the Pimoroni FanSHIM etc.).

**Contents**

- Pre-soldered 3v3 Sustain PCB
- 4x 12mm M2.5 spacers
- 8x 6mm M2.5 screws

Pi4, ClusterHAT, FanSHIM, etc. not included.

## Shipping policy

Please ensure your address is full and correct before placing an order and be aware I'm unable to use some shipping methods to PO boxes.
Deliveries to the USA are sent using RoyalMail PDDP (Postal Delivery Duties Paid).