Overview
The TX91 is a SO-DIMM Computer-on-Module from Ka-Ro electronics, part of the TX Family, based on NXP's new i.MX 91. In a 26mm DIMM200 SO-DIMM form factor, it pairs an Arm Cortex-A55 application core at 1.4 GHz with the NXP EdgeLock secure enclave for hardware-rooted security, 512 MB LPDDR4 with inline ECC and 4 GB eMMC. With dual Ethernet, eight UARTs, dual CAN-FD and a wide industrial power range, the TX91 is purpose-built for cost-optimised, secure industrial gateways, IoT controllers and connected sensor platforms running mainline Linux.
Key Features
Processor
NXP i.MX 91
Cortex-A55 @ 1.4 GHz
Memory
512 MB LPDDR4 (inline ECC)
4 GB eMMC Flash
Temperature Range
Industrial Grade
-25°C to +85°C
Form Factor
26 mm SO-DIMM
DIMM200 connector
Display & Security
24-bit RGB Display
NXP EdgeLock Secure Enclave
OS Support
Linux
Ready for application development
Connectivity
Available Variants
| Feature | TX91 |
|---|---|
| Processor | NXP i.MX 91 |
| Primary Core | Cortex-A55 @ 1.4 GHz |
| RAM | 512 MB LPDDR4 (inline ECC) |
| ROM | 4 GB eMMC |
| Display | 24-bit RGB |
| Ethernet | 10/100 (PHY) + 10/100/1000 RGMII/RMII |
| CAN | 2x CAN-FD |
| Security | NXP EdgeLock Secure Enclave |
| Power Supply | 3.3V to 5V |
| Temperature | -25°C to +85°C |
Design Advantages
Pin-Compatible TXCOM Design
Standard TXCOM pinout across the TX Family enables a scalable platform strategy. Design one baseboard and migrate between processors as application requirements evolve.
EdgeLock Hardware Security
NXP's EdgeLock Secure Enclave delivers crypto, secure boot, secure clock, eFuse key storage and an integrated true random number generator — meeting the security baseline expected by modern industrial IoT deployments without external secure elements.
Compact SO-DIMM Form Factor
At just 26mm wide, the DIMM200 SO-DIMM connector provides a compact, socketed solution that can be replaced or upgraded in the field without soldering.
Cost-Optimised i.MX 91
The i.MX 91 is NXP's entry-point Cortex-A55 application processor — perfect when you need 64-bit Linux capability, modern security and dual Ethernet but don't need GPU, NPU or video acceleration on the module.
Electrical Characteristics
| Parameter | Min | Max |
|---|---|---|
| Power Supply (VIN) | 3.3V | 5V |
| I/O Voltage | - | 3.3V |
| Operating Temperature | -25°C | +85°C |
Documentation
Download the full TX91 datasheet for complete specifications, pinout details, and design guidelines.
Download Datasheet (PDF)