80C51 Microcontrollers

Tekmos now offers replacement parts for many members of the 80C51 family. Based around our internally developed 80C51 core, we now offer replacements for the original Atmel, Intel, and NXP parts.

The main 8051 family is supported by our 8xC51Rx2 family. The 80C51RA2 is a ROMless part that replaced the 80C31, 80C32, 80C32x2, 80C51, 80C51, 80C51FA, and 80C51RA2 devices. This part contains a masked program ROM that can replace the 83C51, 83C52, 833C51FA, and 83C51RB2 devices. Our flash version can replace the one-time-programmable (OTP) 87C51, 87C52, 87C51FA, 87C51FB, 87C51FC, 87C51RA2, 87C51RB2, 87C51RC2, and 87C51RD2 devices. The flash version can also replace the 89C51RA2, 89C51RB2, 89C51RC2, and 89CRD2 devices.

Tekmos also supports many specialty versions of the 80C51 produced by NXP. These include the S87C751/S83C751, the P87C451, and the P89C668.

The Tekmos 80C51 core has been carefully designed to duplicate the original 80C51 on a clock for clock basis. This guarantees complete compatibility with existing code. Even timing loops will work perfectly.

Below is a list of 80C51 microcontroller variants that are available immediately. Consult the Atmel Cross Reference, Intel Cross Reference or the NXP Cross Reference to locate the equivalent Tekmos device. If you need a version not listed here please: Contact Us.