SparkFun

8MB PSRAM Chip for Teensy 4.1

Name: 8MB PSRAM Chip for Teensy 4.1
Brand: SparkFun
SKU: SF-COM-28391
Price: 4.25 AUD
Availability: InStock

· MPN: COM-28391

Teensy ICs and Microchips

$4.25 |

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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...

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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.

Jargon buster

Plain-language definitions for the technical terms used above.

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.
SMD: SMD means surface-mount device, a component style designed to be soldered directly onto the surface of a circuit board rather than through holes. SMD parts are compact and mounted flat on the board, which suits smaller and mass-produced designs.
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.