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Intel KU87C51SLAH — Microcontrollers & Processors (MCU / MPU / DSP)

KU87C51SLAH 8-bit 8051 MCU, 16 MHz, OTP, 100-QFP

MPNKU87C51SLAH
End of Life

Intel/KOCOM KU87C51SLAH, 8-bit 87C51 core MCU, 16 MHz, 16 KB OTP, 256 x 8 RAM, 24 I/O, A/D 4x8b SAR, 100-QFP, 0°C to 70°C, 3 V to 5.5 V.

$15.17Ref. price · indicative, final on quote
Packaging100-QFP
RoHSRoHS non-compliant
Series8XC51SL
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

KU87C51SLAH specifications
ParameterValue
Series8XC51SL
MountingSurface Mount
Oscillator typeExternal, Internal
Program memory typeOTP
Voltage - supply (Vcc (Vdd))3V ~ 5.5V
Operating temperature0°C ~ 70°C (TA)
Speed16MHz
PackageBulk
RAM size256 x 8
Core size8-Bit
PeripheralsLED
ConnectivityUART/USART
Number of i (O)24
Core processor87C51
Case100-QFP
Data convertersA/D 4x8b SAR
Program memory size16KB (16K x 8)

Product details

OTP memory: firmware is locked at the factory

The KU87C51SLAH carries 16 KB of one-time-programmable (OTP) program memory. Once the device is programmed, the code is permanent — no UV erase window, no EEPROM reflash, no firmware field update. For a BOM line, this means every firmware revision or bug fix requires a new, unprogrammed part. The 16 KB OTP is organized as 16K x 8 and is intended for production code that is finalized before the first unit is assembled.

Supply voltage spans 3 V to 5.5 V.

Housed in a 100-pin QFP (19.05 x 19.05 mm body), surface-mount. 24 I/O lines, 4-channel 8-bit SAR ADC, UART/USART integrated.

Frequently asked questions

Can KU87C51SLAH be reprogrammed?

No. The KU87C51SLAH uses one-time-programmable (OTP) memory — once programmed, the code is permanent and cannot be erased or rewritten. Any firmware change requires a new, unprogrammed part.

What is KU87C51SLAH's listed speed?

The KU87C51SLAH is rated for a 16 MHz operating speed on the 87C51 core.

What is the difference between OTP and EPROM?

OTP (one-time programmable) memory is programmed once and cannot be erased. EPROM (erasable programmable read-only memory) can be erased by exposing the die to ultraviolet light through a quartz window, then reprogrammed. The KU87C51SLAH uses OTP, so there is no erase capability.