Adafruit
ESP-PSRAM64H Chip - 64 Mbit Serial Psuedo SRAM - 3.3V 133 MHz
The ESP-PSRAM64H is a 64 Mbit (8 MB) serial pseudo SRAM chip in a compact SOIC-8 package. It provides fast, unlimited read/write external memory for microcon...
The ESP-PSRAM64H is a 64 Mbit (8 MB) serial pseudo SRAM chip in a compact SOIC-8 package. It provides fast, unlimited read/write external memory for microcontrollers like the ESP32 and Teensy 4.1, which have dedicated PSRAM pads or memory-mapping support for seamless integration.
Unlike flash or EEPROM, pseudo SRAM supports unlimited read and write cycles with no wear concerns. The chip operates at 3.3V and supports clock speeds up to 133 MHz via SPI or QPI interfaces, making it ideal for memory-hungry applications such as large buffers, image processing, and audio streaming.
Key Features
- 64 Mbit (8 MB) Capacity – Organised as 8M × 8 bits
- SOIC-8 Package – Compact form factor, suitable for soldering to ESP32 and Teensy 4.1 PSRAM pads
- 3.3V Operation – Compatible with common microcontroller logic levels
- Up to 133 MHz Clock – High-speed serial access; 84 MHz max for burst operations crossing page boundaries
- SPI and QPI Interfaces – Standard SPI for basic use, Quad SPI for faster data rates
- Unlimited Read/Write Cycles – No wear limitations unlike flash or EEPROM
- Memory-Mapping Support – Best performance with chips that support external PSRAM mapping (e.g., ESP32)
Ideal For
- Upgrading ESP32-based boards with additional RAM
- Teensy 4.1 PSRAM expansion
- Memory-intensive applications: image buffers, audio streaming, large data structures
- Any project requiring fast, rewritable external memory via SPI/QPI
Package Contents
- 1× ESP-PSRAM64H Chip (SOIC-8)
Jargon buster
Plain-language definitions for the technical terms used above.
- EEPROM
- A type of non-volatile memory that keeps stored data even when power is turned off. In a sensor module, it can be used to store settings or calibration data so they do not need to be re-entered every time.
- ESP32
- ESP32 is a family of microcontroller modules with built-in wireless features such as Bluetooth and WiFi. Knowing this product uses an ESP32-based module helps explain how it provides wireless serial communication and firmware update features.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- RAM
- RAM is temporary memory used while a device is running, and its contents are lost when power is removed. A “Run in RAM” mode is useful for testing settings without permanently programming the module, but it may not support every feature.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
- SRAM
- Fast temporary memory used by a processor while a program is running. More SRAM helps with projects that handle larger data buffers, networking, displays, or more complex code.
Find this product in
Related Tutorials
Free guides on learn.littlebird.com.au
