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...
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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 low-cost microcontroller chips and modules from Espressif with built-in WiFi and Bluetooth. They support programmable firmware and over-the-air updates, and are commonly programmed with toolchains such as the Arduino core and ESP-IDF.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- RAM
- RAM (random-access memory) is fast, temporary memory a device uses for working data while it is running; in its common volatile form, its contents are lost when power is removed. Some devices offer a mode that applies settings to RAM only, which is handy for testing changes temporarily because they are not stored permanently and disappear at power-off.
- 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.
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