8MB PSRAM Chip for Teensy 4.1

Add extra RAM to a Teensy 4.1 with this 8 Megabyte PSRAM chip. It is intended for projects that need more working memory than the onboard RAM can provide.

The chip is soldered to the smaller pads on the bottom side of the Teensy 4.1, underneath the SD card socket, between pins 31-32 and 33-34. Do not use the larger pads. A single PSRAM chip must be soldered to the smaller pads to be detected.

If 8 MB is not enough for your project, two PSRAM chips can be fitted for a total of 16 MB. Documentation includes Teensy 4.1 hookup details, a memory test program, and the APS6404L-3SQR datasheet.

Specifications:

• Memory Size: 64 Mbit
• Memory Type: PSRAM
• Organization: 8 M x 8
• Clock Frequency: 84MHz for Linear Burst operation
• Interface Type: SPI/QPI with SDR mode
• Supply Voltage - Max: 3.6V
• Supply Voltage - Min: 2.7V
• Maximum Standby Current: 350µA @ 105°C
• Maximum Standby Current: 250µA @ 85°C
• Maximum Standby Current: 140µA @ 25°C
• Operating Temperature Range: Tc = -40°C to +85°C (standard range)
• Operating Temperature Range: Tc = -40°C to +105°C (extended range)
• Mounting: SMD/SMT
• Package: SOP-8L(150)

A compact memory upgrade option for Teensy 4.1 builds that need additional PSRAM for larger buffers, data handling, or memory-intensive embedded projects.