> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# ESP-PSRAM64H Chip - 64 Mbit Serial Pseudo SRAM - 3.3V 133 MHz

**Type:** Product page · **SKU:** ADA4677 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/esp-psram64h-chip-64-mbit-serial-pseudo-sram-3-3v-133-mhz.html ([markdown](https://core-electronics.com.au/esp-psram64h-chip-64-mbit-serial-pseudo-sram-3-3v-133-mhz.html.md))

The ESP-PSRAM64H is a 64 Mbit (8 Megabyte) serial pseudo SRAM device, organized in 8 M x 8 bits and in a compact SOIC-8 package. It is fabricated using the high-performance and high-reliability CMOS technology and can operates at 3.3V and can support up to 133 MHz clock rate. Note, however, that burst operations which cross page boundaries have a lower max input clock frequency at 84 MHz.

## Pricing

- **Price:** $3.50 (inc GST) — $3.18 AUD, exc GST
- **Quantity discounts:** 10+ $3.09 (exc GST) · 50+ $3.02 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 2 today, and up to 500 more in 8–12 days.

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## Description

The ESP-PSRAM64H is a 64 Mbit (8 Megabyte) serial pseudo SRAM device, organized in 8 M x 8 bits and in a compact SOIC-8 package. It is fabricated using the high-performance and high-reliability CMOS technology and can operates at 3.3V and can support up to 133 MHz clock rate. Note, however, that burst operations which cross page boundaries have a lower max input clock frequency at 84 MHz.

The PSRAM device can be accessed via basic Serial Peripheral Interface (SPI) or faster Quad Peripheral Interface (QPI) is supported if the application needs faster data rates. Because it is RAM not FLASH or EEPROM, this device supports unlimited reads and writes to the memory array.

A handy treat to upgrade an [ESP32](https://core-electronics.com.au/search/?q=esp32) based board or [Teensy 4.1](https://core-electronics.com.au/teensy-4-1.html)'s that have a spot on the bottom for PSRAM addition. While it can be used with basic SPI or QSPI interfacing, its best used with chips that have memory-mapping support for external PSRAM so you get seamless operation.

[Datasheet](https://core-electronics.com.au/attachments/localcontent/4677_esp-psram64_esp-psram64h_datasheet_en_134462503a6.pdf)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/4/6/4677-00_1_1.jpg)