AT89S4051-24PU Microchip Integrated Circuit (Dual-In-Line Packages) In Stock
The AT89S4051-24PU is an 8-bit 8051-architecture microcontroller running up to 24 MHz with 4 kB of in-system programmable Flash and 256 B of RAM. It integrates two 16-bit timers, a full-duplex UART, and 15 programmable I/O lines in a compact 20-pin PDIP package. Available from stock worldwide with fast shipping.
- Manufacturer
- Microchip
- Package
- Dual-In-Line Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- AT89S4051-24PU Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of AT89S4051-24PU?
- 8-bit 8051 core running at up to 24 MHz for reliable low-power embedded control
- 4 kB in-system programmable Flash with 1,000-cycle endurance for flexible field updates
- Compact 20-pin PDIP package with 15 programmable I/O lines, dual 16-bit timers, and full-duplex UART
What is AT89S4051-24PU used for?
The AT89S4051-24PU suits cost-sensitive embedded designs such as industrial sensor interfaces, home appliance controllers, and simple robotics that need a proven 8051 core. Its 4 kB Flash and 256 B RAM support small firmware footprints, while the integrated UART enables straightforward serial communication with host systems. The 20-pin PDIP form factor makes it easy to prototype on breadboards and migrate to low-volume production.
What are the specifications of AT89S4051-24PU?
| Pbfree Code | Yes |
| Factory Lead Time | 4Weeks |
| YTEOL | 0 |
| Has ADC | NO |
| Bit Size | 8 |
| Boundary Scan | NO |
| CPU Family | 8051 |
| Clock Frequency-Max | 24MHz |
| DAC Channels | NO |
| DMA Channels | NO |
| Format | FIXED POINT |
| Integrated Cache | NO |
| JESD-30 Code | R-PDIP-T20 |
| JESD-609 Code | e3 |
| Low Power Mode | YES |
| Number of External Interrupts | 2 |
| Number of I/O Lines | 15 |
| Number of Serial I/Os | 1 |
| Number of Timers | 2 |
| On Chip Data RAM Width | 8 |
| On Chip Program ROM Width | 8 |
| PWM Channels | YES |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP20,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| RAM (bytes) | 256 |
| ROM (words) | 4096 |
| ROM Programmability | FLASH |
| Speed | 24MHz |
| Supply Current-Max | 10.5mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 3V |
| Supply Voltage-Nom | 3V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | MATTE TIN |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| uPs/uCs/Peripheral ICs Type | MICROCONTROLLER |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.31.00.01 |
| Country of Origin | Thailand |
Where can I find the AT89S4051-24PU datasheet?
AT89S4051-24PU Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for AT89S4051-24PU?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the maximum clock frequency of the AT89S4051-24PU and how does it affect execution speed?
The AT89S4051-24PU operates at up to 24 MHz. In classic 8051 mode each instruction takes 12 clock cycles, yielding a peak throughput of 2 million instructions per second, which is sufficient for most low-speed sensor-reading and control loops in industrial or consumer applications.
How much non-volatile program storage does the AT89S4051-24PU provide, and can it be updated in the field?
It includes 4 kB of in-system programmable Flash memory with a guaranteed endurance of 1,000 write/erase cycles. Field updates are possible via the SPI-compatible ISP interface, requiring only 4 pins, so the device can be reprogrammed on a target board without removal.
Which compact embedded designs benefit most from the AT89S4051-24PU's 20-pin PDIP package?
The 20-pin PDIP package provides 15 I/O lines in a through-hole footprint measuring roughly 25.4 mm × 6.4 mm, making it ideal for small industrial controllers, keypad scanners, LED drivers, and home-appliance timer circuits where board space is limited and hand-soldering is preferred during prototyping.
What are the supply voltage limits for the AT89S4051-24PU, and is it compatible with 3.3 V systems?
The AT89S4051-24PU is specified for a VCC range of 2.7 V to 5.5 V, covering both 3.3 V and 5 V logic rails. At 2.7 V the maximum clock drops to 6 MHz, while the full 24 MHz is available from 4.5 V to 5.5 V, giving designers flexibility to optimize between speed and power.
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