Intel KU81C51SLAH, 8-Bit 8051 MCU, 16 MHz, 16 KB Mask ROM, 256 x 8 RAM, 4x8b SAR ADC, UART/USART, 24 I/O, 3V–5.5V, 0°C–70°C, 100-PQFP.
| Parameter | Value |
|---|---|
| Mounting type | Surface Mount |
| Oscillator type | External, Internal |
| Program memory type | ROM |
| Voltage - supply (Vcc (Vdd)) | 3V ~ 5.5V |
| Operating temperature | 0°C ~ 70°C (TA) |
| Speed | 16MHz |
| Package | Bulk |
| RAM size | 256 x 8 |
| Core size | 8-Bit |
| Peripherals | LED |
| Connectivity | UART/USART |
| Number of i (O) | 24 |
| Core processor | 87C51 |
| Case | 100-QFP Bumpered |
| Data converters | A/D 4x8b SAR |
| Program memory size | 16KB (16K x 8) |
16 KB program memory is mask ROM, not OTP or Flash. Firmware is etched during fabrication; no field reprogramming.
Rated for 0°C to 70°C ambient. Not qualified for automotive or outdoor use below 0°C or above 70°C.
The KU81C51SLAH uses the same 87C51 core and is pin-compatible with standard 87C51 devices in a 100-PQFP package, but it has 16 KB of mask ROM instead of EPROM or Flash. It is a drop-in for the pinout and electrical interface, but the firmware must be mask-programmed at the factory — not field-programmable like an 87C51 EPROM part.
KU81C51SLAH is sourced to order through independent distribution. Submit an RFQ to confirm current availability and pricing; stock levels and lead times are confirmed at quote time. No stock or price figures are published on this page.
Pricing for KU81C51SLAH in bulk quantities is quoted on request against an RFQ. The mask ROM NRE and minimum order quantities are factored into the quote; contact the distributor for a firm price based on your volume and delivery schedule.
A complete datasheet with full pinout, electrical characteristics, and timing diagrams is available from the manufacturer (Intel) and is typically provided upon request through the distributor. The datasheet covers the 87C51 core, the 16 MHz operating frequency, the 4x8b ADC, and the 100-PQFP pin assignments.
There is no direct pin-compatible second source listed for this specific mask-ROM variant. The MT80C51FB is a functional peer in the 8051 family but runs at 12 MHz and uses a different package type (Bulk). For a Flash-based alternative, consider the AT89C51 series from Microchip, though pinout and package options differ.
No, the KU81C51SLAH is marked RoHS non-compliant. It contains lead and cannot be used in products sold into EU markets or other jurisdictions requiring RoHS conformance. A lead-free 8051 alternative must be sourced for RoHS-regulated BOMs.