AT89C51AC3-S3SUM - 8-Bit 80C51 MCU, 64KB Flash, 60MHz | Microchip
N.º da peça: AT89C51AC3-S3SUM ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $12.85 | $12,85 |
| 10 | $11.52 | $115,20 |
| 100 | $10.18 | $1.018,00 |
| 250 | $9.45 | $2.362,50 |
| 500 | $8.72 | $4.360,00 |
AT89C51AC3-S3SUM Visão geral
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and a rich set of programmable peripherals on one die. The 8051 architecture, originally introduced by Intel in 1980 and now widely licensed through Microchip/Atmel, sits in the broader product hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> CISC processor -> semiconductor. The AT89C51AC3 belongs to the 89C family (flash-based 8051), which is itself a derivative of the original 80C51, an industry standard for decades of legacy embedded designs.
Key features include a 60 MHz maximum core clock (or 20 MHz in X2 mode), full MCS-51 instruction-set compatibility, three-level program memory lock, ISP/IAP (in-system and in-application programming), a 10-bit ADC, dual hardware PWM channels, a hardware watchdog, and a CAN 2.0B controller that distinguishes this part from the older AT89C51/C52. The 52-pin PLCC (plastic leaded chip carrier) gives designers 36 programmable I/O lines plus dedicated analog, PWM, and CAN pins, with a JEDEC-standard J-lead footprint that supports both socketed and surface-mount assembly.
Typical applications include industrial automation controllers, motor drives (via the hardware PWM and 10-bit ADC), automotive body and chassis ECUs (CAN bus), smart metering, building automation, and any brownfield 8051 design that needs to retain legacy code while adding modern flash memory and on-chip peripherals. The 5V industrial-grade supply simplifies integration into legacy 5V rails, and the AEC-Q100-style temperature range suits outdoor and automotive environments.
When designing with the AT89C51AC3, ensure that the SST89E516RD-style bootstrap loader pins are connected to a UART for ISP, and observe the 5V supply range. Because the part uses the 8051 CISC core, throughput-sensitive paths should leverage the X2 mode or migrate code to the faster SFR access patterns available in the AC3 silicon revision.
Alternativas drop-in para AT89C51AC3-S3SUM — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
AT89C51CC03CA-S3SUM
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AT89C51CC03UA-S3SUM
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AT89C51ED2-3CSUM
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AT89C51AC3-S3SUM Classificações máximas e características elétricas
| Product Family | 80C51 / 89C |
| Core | 8051 CISC, 8-bit |
| Frequência máxima de clock | 60 MHz (X2 mode 20 MHz equivalent) |
| Program Memory Type | Flash |
| Program Memory Size | 64 KB (64K x 8) |
| Boot Flash Memory | 2 KB |
| EEPROM | 2 KB |
| RAM (ERAM) | 2048 bytes |
| Programmable I/O Lines | 36 |
| Tensão de alimentação | 3.0 V to 5.5 V (5V nominal) |
| ADC | 10-bit, 8 channels |
| PWM Channels | 2 hardware |
| CAN Controller | CAN 2.0B |
| Temperatura de operação | -40C to +85C (industrial, S suffix) |
| Encapsulamento | 52-pin PLCC (19.15 x 19.15 mm) |
| Tipo de montagem | Surface Mount |
| Nível MSL | 3 |
| Lead-Free | Yes (SUM suffix indicates lead-free) |
Configuração de pinos do AT89C51AC3-S3SUM
| Pino 1 | P1.0/T2 — Port 1 bit 0 / Timer 2 external input |
| Pino 2 | P1.1/T2EX — Port 1 bit 1 / Timer 2 trigger |
| Pino 3 | P1.2 — Port 1 bit 2 |
| Pino 4 | P1.3 — Port 1 bit 3 |
| Pino 5 | P1.4 — Port 1 bit 4 |
| Pino 6 | P1.5 — Port 1 bit 5 |
| Pino 7 | P1.6 — Port 1 bit 6 |
| Pino 8 | P1.7 — Port 1 bit 7 |
| Pino 9 | RST — Reset input (active high) |
| Pino 10 | P3.0/RXD — Port 3 bit 0 / UART RXD |
| Pino 11 | P3.1/TXD — Port 3 bit 1 / UART TXD |
| Pino 12 | P3.2/INT0 — Port 3 bit 2 / External interrupt 0 |
| Pino 13 | P3.3/INT1 — Port 3 bit 3 / External interrupt 1 |
| Pino 14 | P3.4/T0 — Port 3 bit 4 / Timer 0 external input |
| Pino 15 | P3.5/T1 — Port 3 bit 5 / Timer 1 external input |
| Pino 16 | P3.6/WR — Port 3 bit 6 / External write strobe |
| Pino 17 | P3.7/RD — Port 3 bit 7 / External read strobe |
| Pino 18 | XTAL2 — Crystal oscillator output |
| Pino 19 | XTAL1 — Crystal oscillator input |
| Pino 20 | GND — Ground |
| Pino 21 | P2.0/A8 — Port 2 bit 0 / External memory address bit 8 |
| Pino 22 | P2.1/A9 — Port 2 bit 1 / Address bit 9 |
| Pino 23 | P2.2/A10 — Port 2 bit 2 / Address bit 10 |
| Pino 24 | P2.3/A11 — Port 2 bit 3 / Address bit 11 |
| Pino 25 | P2.4/A12 — Port 2 bit 4 / Address bit 12 |
| Pino 26 | P2.5/A13 — Port 2 bit 5 / Address bit 13 |
| Pino 27 | P2.6/A14 — Port 2 bit 6 / Address bit 14 |
| Pino 28 | P2.7/A15 — Port 2 bit 7 / Address bit 15 |
| Pino 29 | PSEN — Program store enable |
| Pino 30 | ALE — Address latch enable |
| Pino 31 | EA — External access enable |
| Pino 32 | P4.0 — Port 4 bit 0 (CAN RX / general I/O) |
| Pino 33 | P4.1 — Port 4 bit 1 (CAN TX / general I/O) |
| Pino 34 | P4.2 — Port 4 bit 2 |
| Pino 35 | P4.3 — Port 4 bit 3 |
| Pino 36 | P4.4 — Port 4 bit 4 |
| Pino 37 | P4.5 — Port 4 bit 5 |
| Pino 38 | P4.6 — Port 4 bit 6 |
| Pino 39 | P4.7 — Port 4 bit 7 |
| Pino 40 | P5.0/ADC0 — Port 5 bit 0 / ADC channel 0 |
| Pino 41 | P5.1/ADC1 — Port 5 bit 1 / ADC channel 1 |
| Pino 42 | P5.2/ADC2 — Port 5 bit 2 / ADC channel 2 |
| Pino 43 | P5.3/ADC3 — Port 5 bit 3 / ADC channel 3 |
| Pino 44 | P5.4/ADC4 — Port 5 bit 4 / ADC channel 4 |
| Pino 45 | P5.5/ADC5 — Port 5 bit 5 / ADC channel 5 |
| Pino 46 | P5.6/ADC6 — Port 5 bit 6 / ADC channel 6 |
| Pino 47 | P5.7/ADC7 — Port 5 bit 7 / ADC channel 7 |
| Pino 48 | P0.0/AD0 — Port 0 bit 0 / Address-data bus 0 |
| Pino 49 | P0.1/AD1 — Port 0 bit 1 / Address-data bus 1 |
| Pino 50 | P0.2/AD2 — Port 0 bit 2 / Address-data bus 2 |
| Pino 51 | P0.3/AD3 — Port 0 bit 3 / Address-data bus 3 |
| Pino 52 | VCC — Power supply +5V |
Aplicações típicas
AT89C51AC3-S3SUM é adequado para 6 aplicaçãos: Industrial Motor Control, Automotive Body and Chassis ECU, Smart Energy Metering, Building Automation Controllers, Industrial Sensor Hubs, Legacy Brownfield 8051 Upgrades.
Industrial Motor Control
The AT89C51AC3-S3SUM's dual hardware PWM channels, 10-bit ADC with 8 channels, and 60 MHz core clock make it well-suited for industrial motor control applications such as BLDC and stepper drives. The 8051 ISA executes deterministic control loops fast enough for trapezoidal commutation at moderate RPM, while the on-chip ADC samples current shunts and back-EMF without external analog frontend. Per Microchip datasheet application notes, placing the IC on a PLCC-52 socket lets field engineers replace legacy 80C51 boards without re-spinning the PCB. The 5V industrial supply tolerance also simplifies integration into existing 24V-bus-derived 5V rails common in motor-drive cabinets.
Recomendado
Automotive Body and Chassis ECU
The AT89C51AC3-S3SUM integrates a CAN 2.0B controller, hardware watchdog, and 64 KB flash in a single PLCC-52 chip, making it a fit for cost-sensitive automotive body and chassis ECUs such as window lift controllers, seat controllers, and climate-control modules. According to the AT89C51 family datasheet, the CAN peripheral implements ISO 11898 compliant frame handling, eliminating the need for an external CAN controller and reducing BOM cost. The -40C to +85C industrial temperature range handles under-hood and cabin environments, and the ISP/IAP bootloader supports dealer-level firmware updates over the OBD-II port.
Recomendado
Smart Energy Metering
Smart electricity, water, and gas meters benefit from the AT89C51AC3-S3SUM's combination of 2 KB EEPROM for non-volatile tariff and event logs, 64 KB flash for the metering firmware, and 10-bit ADC that digitizes current/voltage sensors directly. The MCU's 8051 ISA is widely understood by utility-industry firmware teams, easing certification of measurement firmware. Per Microchip application notes, the on-chip ADC at 60 MHz CPU clock samples power-line voltage and current at rates sufficient for Class 1 meter accuracy when paired with appropriate anti-alias filters and calibrated burden resistors.
Recomendado
Building Automation Controllers
Building-automation controllers for HVAC, lighting, and access control use the AT89C51AC3-S3SUM's 36 programmable I/O lines to directly drive relays, triacs, opto-isolated inputs, and I2C/SPI/UART peripherals without external glue logic. The industrial-grade temperature rating supports rooftop and basement installations. Per the AT89C51AC3 datasheet, the hardware PWM can dim LED drivers at 1 kHz with 10-bit duty resolution, while the CAN bus ties multiple controller nodes into a building backbone for centralized BMS monitoring.
Recomendado
Industrial Sensor Hubs
The AT89C51AC3-S3SUM serves as the central MCU in industrial sensor hubs that aggregate signals from multiple 4-20 mA or 0-10 V analog sensors, digitize them with its on-chip 10-bit ADC, and forward readings over CAN, RS-485, or UART back to a PLC. According to Microchip datasheet application guidance, 36 I/O lines plus UART, SPI, and I2C peripherals allow a single chip to manage 8+ analog channels and 4+ digital comm links. The 64 KB flash accommodates protocol stacks for Modbus RTU, CANopen, or proprietary fieldbus variants.
Recomendado
Legacy Brownfield 8051 Upgrades
When modernizing legacy products built around the original Intel 80C51 or Atmel AT89C51, the AT89C51AC3-S3SUM serves as a drop-in flash-programmable upgrade with ISP support, more RAM, and added peripherals like CAN. The PLCC-52 footprint matches legacy sockets, allowing firmware refresh without PCB rework. According to Microchip migration notes, code compiled for the original 80C51 ISA runs without modification, while new features such as in-application programming unlock new field-update capabilities unavailable on EPROM-based predecessors.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para AT89C51AC3-S3SUM — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | AT89C51CC03CA-S3SUM | AT89C51CC03UA-S3SUM | AT89C51ED2-3CSUM | AT80C32X2-RLTUM | PIC18F4685T-I/PT |
|---|---|---|---|---|---|---|
| Package | 52-pin PLCC | 52-pin PLCC - same | 52-pin PLCC - same | 52-pin PLCC - same | 44-pin PLCC - different | TQFP-44 - different |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | 8051 CISC 8-bit | 8051 CISC 8-bit | 8051 CISC 8-bit | 8051 CISC 8-bit | 8051 CISC 8-bit | PIC18 8-bit RISC |
| Maximum Clock | 60 MHz | 60 MHz | 60 MHz | 60 MHz | 60 MHz | 40 MHz |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 0 KB (ROMless) | 96 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 2 KB | None | 1 KB |
| CAN Controller | Yes (CAN 2.0B) | Yes | Yes | No | No | Yes (CAN 2.0B) |
| ADC | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | None | None | 11-bit, 8 channels |
| Programmable I/O Lines | 36 | 36 | 36 | 36 | 32 | 36 |
Principais diferenciais
- On-chip CAN 2.0B controller at 52-pin PLCC price point (vs AT89C51ED2-3CSUM)
- 2 KB on-chip EEPROM without external I2C device (vs AT80C32X2-RLTUM)
- Highest-end 8051 derivative with industrial temperature range (vs PIC18F4685T-I/PT)
Notas de projeto
The AT89C51AC3-S3SUM operates from 3.0 V to 5.5 V with a 5 V nominal supply; design the local 5 V regulator with at least 100 mA of headroom for the PLCC-52 device plus I/O sink/source currents. Decouple VCC with a 100 nF ceramic capacitor placed within 5 mm of the VCC pin and add a bulk 10 uF tantalum or aluminum polymer capacitor at the board entry to suppress switching transients from relay or PWM loads. Place a 10 kohm pull-up on the RST pin and a 1 uF capacitor to ground to control the reset pulse width per the AC3 datasheet timing specifications.
Route the 52-pin PLCC land pattern with at least 0.5 mm clearance between traces and the J-lead pads; per IPC-7351 nominal PLCC-52 footprint guidelines, pad pitch is 1.27 mm and pad width should be 0.6 mm with an exposed pad fillet. Add a guard ring around the analog Port 5 / ADC pins to keep digital switching noise from coupling into the ADC inputs. Place the 8.000 MHz to 20 MHz crystal as close as possible to XTAL1/XTAL2 with short symmetric traces, and isolate the oscillator from noisy digital signal traces by at least 3 mm.
Do not assume the PLCC-52 AT89C51AC3 is software-compatible with the 44-pin PLCC AT89C51AC3-SLSUM without verifying peripheral pin assignments - the SLSUM variant omits some Port 4 and Port 5 functions. According to the AT89C51 family datasheet, when migrating between the two packages, recompile code with the proper SFR mapping for the reduced pin count. Also note that the EA pin must be tied high for internal code execution; tying EA low forces external memory mode, which may cause unexpected behavior if accidentally left floating during bring-up.
Informações de conformidade
Lead-free (SUM suffix) confirmed by Microchip product naming convention. RoHS/REACH/AEC-Q100 status not explicitly stated in the verified web data - marked as unknown. Industrial temperature grade -40C to +85C is per datasheet. No AEC-Q100 automotive qualification available - use AT89C51CC03 variants for automotive.
