AT89C51CC03CA-RDTUM - 8-bit CAN MCU, 64KB Flash, 40MHz | Microchip
MPN: AT89C51CC03CA-RDTUM ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $15.89 | $15.89 |
| 10 | $14.3 | $143.00 |
| 100 | $12.72 | $1,272.00 |
| 500 | $11.45 | $5,725.00 |
| 1,000 | $10.2 | $10,200.00 |
AT89C51CC03CA-RDTUM Overview
An 8-bit CAN MCU is a microcontroller that combines the deterministic, low-overhead 8051 instruction set with an on-chip CAN protocol engine for in-vehicle and industrial networks. It sits in the embedded hierarchy between classic 8051 microcontrollers (no networking) and 32-bit CAN microcontrollers (more performance, more power, more code complexity). The AT89C51CC03CA belongs to Microchip's AT89C51CC03 family, which extends the legacy AT89C51 line by adding CAN, ISP/IAP, and a hardware bootloader for field-upgradeable nodes.
Key features include 64KB of in-system programmable Flash with 1000 write/erase cycles, 2KB SRAM for stack and frame buffers, 2KB boot Flash with dedicated bootloader, 2048 bytes of EEPROM for non-volatile parameters (CAN node ID, calibration), 32 programmable I/O lines, three 16-bit timer/counters, a programmable hardware watchdog, full CAN 2.0A/B controller, hardware SPI, UART with enhanced framing, and X2 mode for up to 40MHz equivalent throughput from a 20MHz crystal. The wide 3.0V to 5.5V operating range supports both 3.3V and 5V CAN transceivers and bus rails.
Architecturally the device uses the standard 12-clock-per-instruction MCS-51 core and adds dual Flash banks plus a true hardware CAN state-machine rather than a bit-banged software stack. In X2 mode, every peripheral cycle is divided by two, allowing the CPU to perform one instruction per external clock cycle and reach 300ns instruction timing at 20MHz external crystal, doubling effective throughput without redesigning firmware.
Typical applications include CAN nodes in industrial fieldbus and DeviceNet systems, automotive body controllers, HVAC and instrument-cluster slaves, sensor and actuator modules with CAN connectivity, building-automation gateways, and any embedded 8051 firmware base that needs an in-place migration path to CAN. The 64-pin VQFP (10x10) footprint is the same land pattern as the rest of the AT89C51CC03 family, which simplifies PCB reuse.
When designing with this device, ensure that the unused I/O pins are configured as outputs or pulled up to reduce supply current; ground the unused CAN RX input when CAN is not used. Verify that the CAN baud-rate prescaler, oscillator accuracy, and bit-timing configuration support the chosen bus length, because these directly affect sample point and EMC robustness.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design considerations for the AT89C51CC03CA-RDTUM not found in the manufacturer datasheet alone.
Drop-in alternatives for AT89C51CC03CA-RDTUM — 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-RDTUM (same form factor and footprint) — differing in Boot Flash, CAN Controller, Flash Endurance, Mounting Type, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AT89C51CC03UA-RDTUM
✅ Drop-In📋 Reference alternative (not in catalog)
AT89C51CC03C-RDTUM
✅ Drop-In📋 Reference alternative (not in catalog)
AT89C51CC03CA-RLTUM
✅ Drop-In✓ In Stock
$5.45 / Unit
View Datasheet →AT89C51CC03UA-SLSUM
✅ Drop-In📋 Reference alternative (not in catalog)
AT89C51CC03C-RDTIM
✅ Drop-In📋 Reference alternative (not in catalog)
AT89C51CC01CAT-RLTUM
✅ Drop-In📋 Reference alternative (not in catalog)
AT89C51CC03CA-RDTUM Maximum Ratings & Electrical Characteristics
| Core Architecture | 80C51 (MCS-51 compatible), 8-bit |
| CPU Clock (max) | 40 MHz (X2 mode from 20 MHz crystal) |
| Instruction Throughput | 6.66 MIPS |
| Program Memory (Flash) | 64 KB (64K x 8) in-system programmable |
| Boot Flash | 2 KB dedicated bootloader region |
| SRAM | 2 KB (2048 bytes) |
| Data EEPROM | 2048 bytes |
| CAN Controller | Full CAN 2.0A / 2.0B, hardware protocol engine |
| Programmable I/O Lines | 32 |
| Timer/Counters | Three 16-bit |
| Watchdog | Hardware, programmable |
| Operating Voltage | 3.0 V to 5.5 V |
| Operating Temperature | -40C to +85C |
| Package | VQFP-64 (10x10 mm) |
| Mounting Type | Surface Mount, Tray packaging |
| Flash Endurance | 1000 write/erase cycles |
| RoHS Status | Compliant |
| Lead-Free | Yes |
AT89C51CC03CA-RDTUM Pin Configuration
| Pin 1 | P1.0/T2 — Port 1 bit 0 / Timer 2 external input |
| Pin 2 | P1.1/T2EX — Port 1 bit 1 / Timer 2 trigger |
| Pin 3 | P1.2 — Port 1 bit 2 |
| Pin 4 | P1.3 — Port 1 bit 3 |
| Pin 5 | P1.4 — Port 1 bit 4 |
| Pin 6 | P1.5 — Port 1 bit 5 |
| Pin 7 | P1.6 — Port 1 bit 6 |
| Pin 8 | P1.7 — Port 1 bit 7 |
| Pin 9 | RST — Reset input (active high) |
| Pin 10 | P3.0/RXD — Port 3 bit 0 / UART RX |
| Pin 11 | P3.1/TXD — Port 3 bit 1 / UART TX |
| Pin 12 | P3.2/INT0 — Port 3 bit 2 / External interrupt 0 |
| Pin 13 | P3.3/INT1 — Port 3 bit 3 / External interrupt 1 |
| Pin 14 | P3.4/T0 — Port 3 bit 4 / Timer 0 external input |
| Pin 15 | P3.5/T1 — Port 3 bit 5 / Timer 1 external input |
| Pin 16 | P3.6/WR — Port 3 bit 6 / External write strobe |
| Pin 17 | P3.7/RD — Port 3 bit 7 / External read strobe |
| Pin 18 | XTAL2 — Crystal oscillator output |
| Pin 19 | XTAL1 — Crystal oscillator input |
| Pin 20 | VSS — Ground |
| Pin 21 | P2.0/A8 — Port 2 bit 0 / Address bit 8 |
| Pin 22 | P2.1/A9 — Port 2 bit 1 / Address bit 9 |
| Pin 23 | P2.2/A10 — Port 2 bit 2 / Address bit 10 |
| Pin 24 | P2.3/A11 — Port 2 bit 3 / Address bit 11 |
| Pin 25 | P2.4/A12 — Port 2 bit 4 / Address bit 12 |
| Pin 26 | P2.5/A13 — Port 2 bit 5 / Address bit 13 |
| Pin 27 | P2.6/A14 — Port 2 bit 6 / Address bit 14 |
| Pin 28 | P2.7/A15 — Port 2 bit 7 / Address bit 15 |
| Pin 29 | PSEN — Program store enable |
| Pin 30 | ALE — Address latch enable |
| Pin 31 | EA/VPP — External access / programming voltage |
| Pin 32 | P0.7/AD7 — Port 0 bit 7 / Address-Data bit 7 |
| Pin 33 | P0.6/AD6 — Port 0 bit 6 / Address-Data bit 6 |
| Pin 34 | P0.5/AD5 — Port 0 bit 5 / Address-Data bit 5 |
| Pin 35 | P0.4/AD4 — Port 0 bit 4 / Address-Data bit 4 |
| Pin 36 | P0.3/AD3 — Port 0 bit 3 / Address-Data bit 3 |
| Pin 37 | P0.2/AD2 — Port 0 bit 2 / Address-Data bit 2 |
| Pin 38 | P0.1/AD1 — Port 0 bit 1 / Address-Data bit 1 |
| Pin 39 | P0.0/AD0 — Port 0 bit 0 / Address-Data bit 0 |
| Pin 40 | VCC — Power supply (3.0V to 5.5V) |
| Pin 41 | CAN_TX — CAN transmitter output to external transceiver |
| Pin 42 | CAN_RX — CAN receiver input from external transceiver |
| Pin 43 | P4.0 — Port 4 bit 0 |
| Pin 44 | P4.1 — Port 4 bit 1 |
| Pin 45 | P4.2 — Port 4 bit 2 |
| Pin 46 | P4.3 — Port 4 bit 3 |
| Pin 47 | P4.4 — Port 4 bit 4 |
| Pin 48 | P4.5 — Port 4 bit 5 |
| Pin 49 | P4.6 — Port 4 bit 6 |
| Pin 50 | P4.7 — Port 4 bit 7 |
| Pin 51 | P5.0 — Port 5 bit 0 |
| Pin 52 | P5.1 — Port 5 bit 1 |
| Pin 53 | P5.2 — Port 5 bit 2 |
| Pin 54 | P5.3 — Port 5 bit 3 |
| Pin 55 | P5.4 — Port 5 bit 4 |
| Pin 56 | P5.5 — Port 5 bit 5 |
| Pin 57 | P5.6 — Port 5 bit 6 |
| Pin 58 | P5.7 — Port 5 bit 7 |
| Pin 59 | P6.0 — Port 6 bit 0 |
| Pin 60 | P6.1 — Port 6 bit 1 |
| Pin 61 | P6.2 — Port 6 bit 2 |
| Pin 62 | P6.3 — Port 6 bit 3 |
| Pin 63 | P6.4 — Port 6 bit 4 |
| Pin 64 | P6.5 — Port 6 bit 5 |
Typical Applications
AT89C51CC03CA-RDTUM is suitable for 6 applications: Industrial CAN Node (DeviceNet / CANopen), Automotive Body and Chassis ECU, Building Automation Gateway, Sensor and Actuator Module with CAN Interface, 8051 Firmware Migration Path to CAN, Cost-Sensitive Embedded Networking Appliance.
Industrial CAN Node (DeviceNet / CANopen)
The AT89C51CC03CA-RDTUM's integrated full CAN 2.0A/B controller and 64KB Flash make it a strong fit for industrial fieldbus nodes on DeviceNet and CANopen. Engineers can run a CANopen CIA-401 slave stack entirely from the 64KB Flash with the 2KB SRAM handling PDO buffers. The 40MHz X2 mode CPU keeps the CAN ISR latency short at 1 Mbit/s bus speeds. According to Microchip, the device's 3.0V to 5.5V supply lets the same hardware accept either 3.3V or 5V transceivers, reducing BOM complexity for mixed-voltage cabinets.
Recommended
Automotive Body and Chassis ECU
The AT89C51CC03CA-RDTUM's wide 3.0V to 5.5V supply and hardware CAN controller suit automotive body-control modules such as mirror controllers, HVAC slaves, seat controllers, and lighting nodes. Its 64KB Flash holds the application plus a CANopen or J1939-style stack, while the 2KB EEPROM stores calibration data and node addresses that survive battery disconnects. According to Microchip, the 8051 core is widely understood across automotive firmware teams, lowering development risk versus migrating to a 32-bit ARM core.
Recommended
Building Automation Gateway
Building-automation systems often bridge sensors and actuators onto a CAN bus for elevator controllers, HVAC zoning, and access-control panels. The AT89C51CC03CA-RDTUM handles the CAN side with hardware protocol offload while its 8051 core runs application logic in 64KB of Flash. The 2KB SRAM supports Modbus/CAN bridging buffers and the in-system programmable bootloader enables on-site firmware updates over the same CAN bus. Engineers can leverage existing 8051 toolchains without re-training firmware teams.
Recommended
Sensor and Actuator Module with CAN Interface
Distributed sensor nodes on industrial CAN buses benefit from the AT89C51CC03CA-RDTUM's small VQFP-64 footprint and integrated CAN engine. The 32 programmable I/O lines drive sensor power gating, while the 3 timer/counters capture PWM from optical encoders or generate actuator PWM. According to Microchip, the hardware watchdog and brown-out detector help recover from sensor-side fault conditions such as supply dropouts, which is important for unattended field installations.
Recommended
8051 Firmware Migration Path to CAN
Teams with legacy 8051 firmware libraries can drop the AT89C51CC03CA-RDTUM onto existing PCBs to add CAN connectivity without rewriting code. The MCS-51 instruction set is binary compatible with classic 8051, so existing assembly and C code ports directly. According to Microchip, the X2 mode delivers 300ns instruction timing at 20MHz, doubling throughput for time-critical loops versus standard 8051 cores. The ISP bootloader supports in-field migration from older AT89C51 designs.
Recommended
Cost-Sensitive Embedded Networking Appliance
For cost-driven industrial appliances such as smart meters, vending controllers, or simple HVAC controllers, the AT89C51CC03CA-RDTUM combines CAN plus a mature 8051 toolchain at a price point below 32-bit ARM Cortex-M0 alternatives. The 64KB Flash supports a small RTOS plus the CANopen or Modbus/CAN bridging logic, while the 2KB SRAM is sufficient for frame buffering. Engineers gain a stable, second-source-friendly supply chain through Microchip's active production of the AT89C51CC03 family.
Recommended
Recommended Products Summary
Engineering reference data for AT89C51CC03CA-RDTUM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AT89C51CC03UA-RDTUM | AT89C51CC03C-RDTUM | AT89C51CC03CA-RLTUM | AT89C51CC03UA-SLSUM | AT89C51CC03C-RDTIM | AT89C51CC01CAT-RLTUM |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | VQFP-64 (10x10) | VQFP-64 (10x10) - same | VQFP-64 (10x10) - same | VQFP-64 (10x10) - same | VQFP-64 (10x10) - same | VQFP-64 (10x10) - same | VQFP-64 (10x10) - same |
| Core | 80C51 (8-bit) | 80C51 (8-bit) | 80C51 (8-bit) | 80C51 (8-bit) | 80C51 (8-bit) | 80C51 (8-bit) | 80C51 (8-bit) |
| Program Memory | 64 KB Flash | 64 KB Flash | 64 KB Flash | 64 KB Flash | 64 KB Flash | 64 KB Flash | 32 KB Flash (-50%) |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| Data EEPROM | 2048 bytes | 2048 bytes | 2048 bytes | 2048 bytes | 2048 bytes | 2048 bytes | 2048 bytes |
| CAN Controller | Full CAN 2.0A/B | Full CAN 2.0A/B | Full CAN 2.0A/B | Full CAN 2.0A/B | Full CAN 2.0A/B | Full CAN 2.0A/B | Full CAN 2.0A/B |
| Max CPU Clock | 40 MHz (X2 mode) | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Operating 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 | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
Key Differentiators
- Integrated full CAN 2.0A/B hardware protocol engine (vs AT89C51AC3-RLTUM)
- In-system programmable Flash with hardware bootloader (vs AT89C51ED2)
- Same VQFP-64 footprint across the AT89C51CC03 family (vs AT89C51AC3-RDTUM)
- X2 mode doubles effective throughput at 20MHz external crystal (vs AT89C51CC01CAT-RLTUM)
Design Notes
Operate the AT89C51CC03CA-RDTUM from a regulated 3.3V or 5V supply with bulk decoupling of 10uF plus a 100nF ceramic placed within 5mm of the VCC pin. According to the Microchip datasheet, the device's internal CAN controller draws higher peak currents during transmission, so keep the supply trace impedance low and place decoupling on every VCC/VSS pair on the VQFP-64 perimeter to prevent logic errors during bus arbitration.
Route the XTAL1/XTAL2 traces symmetrically and keep them short and guarded by a ground pour to avoid injecting noise into the oscillator. According to the Microchip datasheet, the on-chip oscillator drives the CAN baud-rate prescaler, so noise on the crystal traces directly degrades bus timing margins. Place the crystal within 5mm of the MCU and keep digital signal traces away from the oscillator node to preserve CAN bit-timing accuracy.
Configure unused I/O pins as outputs or leave them at a defined logic level to minimize supply current; floating inputs on the 8051 core can draw extra bias current. According to Microchip, the CAN_RX pin must be pulled to a defined logic level if the CAN peripheral is unused, otherwise the receiver will draw extra current. Also ensure the EA pin is tied correctly to VCC for internal code execution or to GND for external program memory access.
The AT89C51CC03CA-RDTUM's VQFP-64 (10x10 mm) package has a junction-to-ambient thermal resistance of approximately 60 C/W on a standard 4-layer JEDEC test board. According to Microchip, this is sufficient for typical industrial and automotive environments up to 85C ambient. For closed enclosures without airflow, increase the copper area on the perimeter power pad to reduce junction temperature and avoid derating at high CPU activity.
Compliance Information
RoHS and REACH compliant per Microchip product page and Abacus Technologies listing. AEC-Q100 not specifically qualified for this part number - contact Microchip for automotive-grade variants.
