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 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)