AT89C51CC03CA-RLTUM - 8-bit 8051 MCU 64KB Flash CAN VQFP-44 | Microchip
MPN: AT89C51CC03CA-RLTUM ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.45 | $5,450.00 |
AT89C51CC03CA-RLTUM Overview
An 8051 microcontroller is a CISC 8-bit MCU architecture originally introduced by Intel in 1980 and now widely produced as a license-free core by several vendors. The 8051 sits within the broader hierarchy of microcontrollers -> embedded controllers -> semiconductor ICs and is widely deployed in industrial, automotive, and consumer nodes where deterministic behavior, low cost, and a mature toolchain outweigh the need for high-performance 32-bit cores. Devices with on-chip CAN are specifically positioned for automotive body and chassis networks, industrial fieldbus, and building-automation backbones where a CAN 2.0B controller simplifies bus arbitration.
The AT89C51CC03CA integrates a full CAN 2.0B controller (15 message objects, programmable bit timing up to 1 Mbit/s), three 16-bit timer/counters, a hardware watchdog, dual UARTs, SPI, and a 10-bit ADC. With 1,000 write/erase cycle endurance on Flash, three-level program memory lock, and 4 KB of boot Flash for in-application re-programmability over UART or CAN, the device targets field-upgradable nodes and CAN bootloader implementations. The 32 programmable I/O lines on the 44-pin VQFP expose most of the 8051 peripheral set without external glue logic.
Typical applications include CAN nodes in automotive body ECUs (door modules, seat controllers, lighting), industrial CANopen / DeviceNet slave nodes, HVAC controllers, building automation gateways, and sensor hubs that must communicate over an ISO 11898 bus. The combination of 64 KB Flash, 2 KB EEPROM for parameter storage, and an on-chip CAN controller lets engineers build a complete CAN node with no external protocol IC. The wide 3.0 V to 5.5 V supply range also supports both 3.3 V and legacy 5 V CAN transceivers without level shifting.
When designing with this MCU, ensure the CAN bus termination, slew-rate, and common-mode voltage ratings of the external transceiver (such as MCP2551 or ATA6560) match the target network. The VQFP-44 thermal resistance is modest; at 40 MHz the core is well within junction limits, but a ground plane and decoupling close to VCC/AVCC pins are required to keep the ADC reference stable. This page synthesizes distributor pricing, drop-in VQFP-44 alternatives within the AT89 family, and practical design notes that go beyond the manufacturer datasheet.
Drop-in alternatives for AT89C51CC03CA-RLTUM — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AT89C51CC03CA-RLTUM (same form factor and footprint) — differing in CAN Controller, Package, Flash Endurance, Mounting Type, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AT89C51CC03CAT-RLTUM
✅ Drop-In📋 Reference alternative (not in catalog)
AT89C51CC03UA-RLTUM
✅ Drop-In📋 Reference alternative (not in catalog)
AT89C51CC03U-RLRIM
✅ Drop-In📋 Reference alternative (not in catalog)
AT89C51AC3T-RLTUM
✅ Drop-In📋 Reference alternative (not in catalog)
AT89C51CC03CA-RDTUM
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$10.2 / Unit
View Datasheet →AT89C51CC03CA-RLTUM Maximum Ratings & Electrical Characteristics
| Core | 80C51 8-bit (MCS-51 compatible) |
| Series | AT89C51 CAN family |
| Maximum Clock Frequency | 40 MHz (X1 mode), 20 MHz X2 mode |
| Program Memory (Flash) | 64 KB (64K x 8) in-system programmable |
| Boot Flash | 4 KB (CAN/UART bootloader) |
| RAM | 2.25 KB (256 B internal + 2 KB XRAM) |
| EEPROM | 2 KB |
| CAN Controller | CAN 2.0B, 15 message objects, up to 1 Mbit/s |
| Supply Voltage (Vcc) | 3.0 V to 5.5 V |
| I/O Lines | 32 programmable |
| Timers | 3 x 16-bit timer/counters |
| UART | 2 |
| SPI | Yes |
| ADC | 10-bit, 8 channels |
| Watchdog Timer | Hardware, programmable |
| Package | 44-pin VQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (industrial) |
| Flash Endurance | 1,000 write/erase cycles |
| RoHS Status | Compliant |
AT89C51CC03CA-RLTUM Pin Configuration
| Pin 1 | P1.4/CEX4/SS — Port 1.4 / PWM channel 4 / SPI slave select |
| Pin 2 | P1.5/MOSI — Port 1.5 / SPI master-out slave-in |
| Pin 3 | P1.6/MISO — Port 1.6 / SPI master-in slave-out |
| Pin 4 | P1.7/SCK — Port 1.7 / SPI clock |
| Pin 5 | RST — Reset input (active high) |
| Pin 6 | P3.0/RxD — Port 3.0 / UART0 receive |
| Pin 7 | P3.1/TxD — Port 3.1 / UART0 transmit |
| Pin 8 | P3.2/INT0 — Port 3.2 / external interrupt 0 |
| Pin 9 | P3.3/INT1 — Port 3.3 / external interrupt 1 |
| Pin 10 | P3.4/T0 — Port 3.4 / Timer 0 external input |
| Pin 11 | P3.5/T1 — Port 3.5 / Timer 1 external input |
| Pin 12 | P3.6/WR — Port 3.6 / external data write strobe |
| Pin 13 | P3.7/RD — Port 3.7 / external data read strobe |
| Pin 14 | XTAL2 — Crystal output (to crystal) |
| Pin 15 | XTAL1 — Crystal input (from crystal or external clock) |
| Pin 16 | P0.4 — Port 0.4 (bidirectional, open-drain capable) |
| Pin 17 | P0.5 — Port 0.5 |
| Pin 18 | P0.6 — Port 0.6 |
| Pin 19 | P0.7 — Port 0.7 |
| Pin 20 | VCC — Digital supply voltage (3.0 V to 5.5 V) |
| Pin 21 | P0.0/AD0 — Port 0.0 / multiplexed address-data 0 |
| Pin 22 | P0.1/AD1 — Port 0.1 / multiplexed address-data 1 |
| Pin 23 | P0.2/AD2 — Port 0.2 / multiplexed address-data 2 |
| Pin 24 | P0.3/AD3 — Port 0.3 / multiplexed address-data 3 |
| Pin 25 | CANRX — CAN receive input from external transceiver |
| Pin 26 | CANTX — CAN transmit output to external transceiver |
| Pin 27 | P2.0/A8 — Port 2.0 / high address byte bit 0 |
| Pin 28 | P2.1/A9 — Port 2.1 / high address byte bit 1 |
| Pin 29 | P2.2/A10 — Port 2.2 / high address byte bit 2 |
| Pin 30 | P2.3/A11 — Port 2.3 / high address byte bit 3 |
| Pin 31 | EA/VPP — External access enable / Flash programming voltage |
| Pin 32 | P2.4/A12 — Port 2.4 / high address byte bit 4 |
| Pin 33 | P2.5/A13 — Port 2.5 / high address byte bit 5 |
| Pin 34 | P2.6/A14 — Port 2.6 / high address byte bit 6 |
| Pin 35 | P2.7/A15 — Port 2.7 / high address byte bit 7 |
| Pin 36 | PSEN — Program store enable (external code fetch) |
| Pin 37 | ALE — Address latch enable |
| Pin 38 | P1.0/T2 — Port 1.0 / Timer 2 external input |
| Pin 39 | P1.1/T2EX — Port 1.1 / Timer 2 capture/reload trigger |
| Pin 40 | P1.2/CEX0 — Port 1.2 / PCA/PWM channel 0 |
| Pin 41 | P1.3/CEX1 — Port 1.3 / PCA/PWM channel 1 |
| Pin 42 | AVCC — Analog supply voltage (tie to VCC) |
| Pin 43 | AVSS — Analog ground |
| Pin 44 | GND — Digital ground |
Typical Applications
AT89C51CC03CA-RLTUM is suitable for 6 applications: Automotive CAN Body Control Node, Industrial CANopen / DeviceNet Slave, Building Automation Gateway, HVAC and Refrigeration Controller, Sensor Hub with CAN Uplink, CAN Bootloader Service Tool.
Automotive CAN Body Control Node
The AT89C51CC03CA-RLTUM is well-suited for automotive body and chassis CAN nodes such as door modules, seat controllers, and lighting ECUs. The integrated CAN 2.0B controller with 15 message objects supports 500 kbit/s HS-CAN bus arbitration directly, eliminating an external CAN protocol IC and shrinking BOM. The 64 KB Flash holds the full state-machine plus J1939/CANopen stack, while 2 KB of EEPROM stores node configuration, calibration tables, and DTCs across key-off cycles. With 32 programmable I/O lines and three 16-bit timers, the MCU can drive H-bridge FETs, read switches, and PWM lamps from one VQFP-44 footprint, making it a strong fit for distributed body nodes.
Recommended
Industrial CANopen / DeviceNet Slave
On industrial CANopen and DeviceNet slave nodes, the AT89C51CC03CA-RLTUM combines a deterministic 8051 core with a hardware CAN 2.0B engine, allowing real-time PDO/SDO handling without software bit-banging. The 64 KB in-system programmable Flash supports object dictionary updates in the field, and the 4 KB boot Flash area enables CAN-based firmware upgrades over the bus. With 3.0 V to 5.5 V supply tolerance, the device interfaces directly with 5 V CAN transceivers used on legacy 24 V industrial backplanes. The combination of 2 KB EEPROM, dual UART, and SPI simplifies connection to digital sensors and HMI displays in a single slave module.
Recommended
Building Automation Gateway
In building-automation backbones (BACnet, Modbus-over-CAN, KNX gateways), the AT89C51CC03CA-RLTUM acts as a small protocol bridge. Its on-chip CAN controller aggregates sensor data from multiple HVAC, lighting, and access-control nodes onto a single HS-CAN backbone, while the dual UART links to legacy RS-485 or RS-232 metering devices. The 64 KB Flash fits BACnet/Modbus stacks with room for custom logic, and 2 KB of EEPROM retains scheduling and setpoint data through power cycles. Operating from -40C to +85C, the part handles unheated plant rooms and rooftop equipment with no derating.
Recommended
HVAC and Refrigeration Controller
The AT89C51CC03CA-RLTUM is widely used in compressor and refrigeration controllers, where its integrated CAN bus simplifies master/slave communication between indoor and outdoor units. The 10-bit ADC with 8 channels reads temperature sensors (NTC), pressure transducers, and current sense amplifiers directly, while the three 16-bit timers generate PWM for compressor inverters, fans, and EEV valves. The 2 KB EEPROM stores service logs, fault counters, and compressor run-hours that must persist across power cycles. Industrial -40C to +85C operation and 5 V tolerance suit both indoor thermostats and outdoor condensing units.
Recommended
Sensor Hub with CAN Uplink
Distributed sensor hubs - such as environmental monitors, smart agriculture nodes, or motor vibration sensors - benefit from the AT89C51CC03CA-RLTUM's combination of 10-bit ADC, SPI, dual UART, and CAN 2.0B. The MCU samples multiple analog and digital sensors, performs local filtering, and reports aggregated data over CAN at programmable bit rates up to 1 Mbit/s. With 2.25 KB of RAM and 2 KB EEPROM, the device can buffer measurement bursts and store calibration constants without external memory. The 44-pin VQFP fits compact IP65 sensor enclosures with limited PCB area.
Recommended
CAN Bootloader Service Tool
The AT89C51CC03CA-RLTUM's 4 KB boot Flash area and hardware CAN controller make it an ideal CAN bootloader target. A service tool can upload new firmware over the bus without opening the enclosure, reducing field-service cost for installed CAN nodes. The 64 KB application Flash provides ample room for full firmware images, while 2 KB of EEPROM retains boot flags and version counters across reprogramming cycles. The integrated CAN 2.0B controller with 15 message objects supports the UDS/KWP2000 over CAN service protocols used in automotive diagnostics.
Recommended
Recommended Products Summary
Engineering reference data for AT89C51CC03CA-RLTUM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AT89C51CC03CAT-RLTUM | AT89C51CC03UA-RLTUM | AT89C51CC03U-RLRIM | AT89C51AC3T-RLTUM |
|---|---|---|---|---|---|
| Package | VQFP-44 (10x10 mm) | VQFP-44 (10x10 mm) | VQFP-44 (10x10 mm) | VQFP-44 (10x10 mm) | VQFP-44 (10x10 mm) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | 80C51, 8-bit | 80C51, 8-bit | 80C51, 8-bit | 80C51, 8-bit | 80C51, 8-bit |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| CAN Controller | CAN 2.0B, 15 msg objects | CAN 2.0B, 15 msg objects | CAN 2.0B, 15 msg objects | CAN 2.0B, 15 msg objects | None (no CAN, more analog channels) |
| Max Clock (X1 mode) | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
Key Differentiators
- Integrated CAN 2.0B controller with 15 message objects (vs AT89C51AC3T-RLTUM)
- 2 KB on-chip EEPROM for parameter storage (vs AT89C51ED2-RLTUM)
- 4 KB dedicated boot Flash for CAN/UART bootloader (vs AT89C51CC03CA-RDTUM (VQFP-64))
Design Notes
Decouple VCC (pin 20) and AVCC (pin 42) with 100 nF ceramic capacitors placed within 5 mm of the pins, plus a 10 uF bulk capacitor at the supply entry. Tie AVSS (pin 43) and GND (pin 44) to a single low-impedance ground plane; do not run high-current return paths between these pins. Estimated: at 40 MHz with all peripherals enabled the core current peaks near 25 mA, so the regulator must provide at least 50 mA headroom to avoid supply sag during CAN transmissions.
Route the CANTX (pin 26) and CANRX (pin 25) traces as a differential pair with 60 ohm controlled impedance, kept as short as possible to the external MCP2551 or ATA6560 transceiver. Place the transceiver within 30 mm of the MCU and add a 120 ohm termination resistor at the bus end, not at the MCU. Avoid routing CAN traces near the switching node of any onboard DC-DC converter; keep at least 3 mm clearance from clock and PWM edges.
Do not leave EA/VPP (pin 31) floating; tie it to VCC for normal execution from internal Flash. Pull RST (pin 5) high with a 10 kohm resistor and add a 1 nF cap to GND to filter noise; floating resets are a common field-failure source. When using the CAN bootloader, the boot Flash is write-locked by default - unlock bit BLJB in SFR must be cleared before ISP programming over CAN can begin.
XTAL1 (pin 15) and XTAL2 (pin 14) traces must be short, symmetric, and surrounded by a ground pour on both sides to avoid clock jitter that corrupts CAN bit timing. Use a crystal rated for 20 pF load or less; the on-chip oscillator amplifier saturates with larger loads. If using an external clock source, drive XTAL1 only and leave XTAL2 floating.
Compliance Information
RoHS and REACH compliance confirmed via Microchip product page. AEC-Q100 not applicable; for AEC-Q100 automotive grade, consider Microchip dsPIC33/AVR automotive families rather than the legacy AT89 industrial grade.
