MCP2551-E - 1Mb/s High-Speed CAN Transceiver, ISO-11898 | Microchip
MPN: MCP2551-E ✓ Hoạt độngMCP2551-E Tóm tắt
A CAN transceiver is the analog physical-layer bridge of any CAN bus, sitting between a digital CAN controller (such as the MCP2515) and the actual twisted-pair wiring harness. Its primary job is to translate the controller's TXD/RXD CMOS logic into the dominant/recessive differential voltage levels defined by ISO-11898, while absorbing ESD strikes, bus shorts, and load-dump transients so the fragile controller is never exposed to them. As a category, CAN transceivers fall under interface ICs in the broader semiconductor taxonomy of standard logic and bus-interface devices.
Key features of the MCP2551-E include three operating modes (high-speed, slope-control for lower EMI, and standby) selected via the RS pin, a transmitter capable of driving a worst-case 45-Ω load (corresponding to a heavily-loaded bus with 64 nodes), automatic thermal-shutdown protection, and bus fault tolerance meeting the 24V automotive requirement. The VREF pin supplies a 0.5 × VCC reference useful for stabilizing the recessive level.
Architecturally, the die uses a bipolar driver stage for robust bus-side drive strength, with CMOS logic on the controller-side pins. The driver's output impedance and the on-chip slope-control current source are trimmed at the wafer level to give predictable rise/fall times across temperature, which is important in automotive under-hood environments where the bus length and capacitance can vary widely.
Typical applications include in-vehicle networking (OBD-II, body controllers, instrument clusters), industrial CANopen and DeviceNet links, and any 5V microcontroller system needing a standard ISO-11898 CAN port. Designers often pair the MCP2551-E with the MCP2515 controller (the same Microchip family) for a complete CAN node.
When designing with the MCP2551-E, always place a 100 nF decoupling capacitor close to VCC and provide a common-mode choke plus a 120 Ω termination resistor at each end of the bus. The part is now being superseded by the AEC-Q100-qualified MCP2561 for new automotive designs, but remains widely available and fully supported for industrial and legacy systems.
This page consolidates Microchip datasheet specifications, drop-in SOIC-8 alternatives such as the MCP2561 and TI SN65HVD251, and field-level design guidance not found in a quick distributor lookup.
Bộ thay thế dễ dàng lắp đặt cho MCP2551-E — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MCP2551-E (cùng hình factor và footprint) — khác nhau ở Package, Product Type.
MCP2561-E/SN
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MCP2562-E/SN
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MCP2551T-E/SN
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MCP2551-I/SN
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN65HVD251D
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MCP2551-E Thông số kỹ thuật
| Data Rate (Max) | 1 Mb/s |
| CAN Standard | ISO-11898 (including 24V) |
| Supply Voltage (VCC) | 4.5 V to 5.5 V |
| Standby Current (typ) | 275 µA |
| Number of Drivers/Receivers | 1/1 |
| Nhiệt độ hoạt động | -40°C to +125°C (E temp grade) |
| Bus Pins Fault Voltage (max) | -40 V to +40 V |
| Common-Mode Voltage Range | -2 V to +7 V |
| Hộp | 8-pin SOIC (SN) |
| Kiểu lắp đặt | Surface Mount |
| Pin Function (RS) | Slope-control / mode select |
| Pin Function (VREF) | 0.5 × VCC reference |
| Thermal-Shutdown Protection | Yes |
| AEC-Q100 Qualified | No (MCP2561 is the AEC-Q100 upgrade) |
| Trạng thái RoHS | Compliant |
Cấu hình chân MCP2551-E
| Chân 1 | TXD — Transmit data input from CAN controller (CMOS, 5V tolerant) |
| Chân 2 | VCC — 5V supply input (4.5V to 5.5V) |
| Chân 3 | RS — Slope-control / mode select (high = standby, low = high-speed, resistor to GND = slope-control) |
| Chân 4 | RXD — Receive data output to CAN controller (CMOS, 5V) |
| Chân 5 | VREF — Reference voltage output, nominally 0.5 × VCC |
| Chân 6 | CANL — Low-side CAN bus line (differential) |
| Chân 7 | CANH — High-side CAN bus line (differential) |
| Chân 8 | GND — Ground |
Ứng dụng tiêu biểu
MCP2551-E phù hợp cho 7 Áp dụngs: In-Vehicle OBD-II / Body Network CAN Nodes, Industrial CANopen and DeviceNet Networks, Embedded HMI and I/O Module CAN Backbones, CAN-Bus-Based Robotics and Motor-Control Links, Smart-Sensor CAN Modules, Industrial IoT Gateways and Edge Bridges, Aftermarket Telematics and Diagnostics Tools.
In-Vehicle OBD-II / Body Network CAN Nodes
The MCP2551-E is widely deployed as the physical-layer interface in automotive OBD-II, body-control and instrument-cluster CAN nodes. Its ±40V bus-pin fault tolerance covers 24V load-dump excursions on 12V vehicle buses, and its 1 Mb/s capability supports both 500 kb/s high-speed CAN and 250 kb/s fault-tolerant CAN used in body modules. The internal thermal-shutdown trips at ~165°C to protect the die during sustained shorts. Pair the part with the Microchip MCP2515 controller for a complete CAN node; engineers usually terminate the bus with 120 Ω at each end and add a common-mode choke for EMI. The MCP2551-E/SN is the default reference for retrofit and aftermarket automotive tooling where AEC-Q100 is not mandatory.
Được đề xuất
Industrial CANopen and DeviceNet Networks
In industrial automation the MCP2551-E is a common building block of CANopen and DeviceNet nodes driving PLCs, motor inverters and remote I/O blocks. The RS pin lets the designer trade slew-rate vs EMI for long cables typically found on factory floors, where EN 50321 emissions budgets push designers toward the slowed-edge mode. The device's 8-pin SOIC footprint is friendly to 0805-passive placement machines, and the 5V supply is available from nearly every industrial MCU's voltage rail. Industrial designers should still re-spice to add a TVS diode on the bus pins for 24V surge protection beyond the bare ISO-11898 envelope.
Được đề xuất
Embedded HMI and I/O Module CAN Backbones
Embedded human-machine interfaces (HMIs) and remote I/O modules on industrial equipment frequently use the MCP2551-E to attach a 5V Cortex-M or PIC MCU to a CAN backbone running Modbus-over-CAN or CANopen. The 0.5 × VCC VREF output is useful for biasing the bus before connecting the rest of the network, allowing hot-plug of an HMI without disturbing communication. The 1 Mb/s rate enables fast polling for time-critical process variables, while standby mode at 275 µA lets designers hit industrial energy-saving targets when the HMI is not actively polling.
Được đề xuất
CAN-Bus-Based Robotics and Motor-Control Links
Compact robotic platforms using a centralized host with multiple distributed motor controllers rely on the MCP2551-E's small SOIC-8 footprint and 1 Mb/s rate to handle high-rate joint-torque feedback loops. The part's ±40V fault rating protects motor-driver ground-bounce events, and the slope-control mode lets designers tighten the bus spectrum for compliance with industrial EMC immunity standards. Pair with a microcontroller such as the dsPIC33EP or a TI C2000 MCU that exposes a CAN peripheral to form a full motion-control node. Use ferrite beads and TVS diodes to harden against motor PWM noise coupling into the bus.
Được đề xuất
Smart-Sensor CAN Modules
Smart sensor nodes (temperature, pressure, GPS receivers with CAN output) frequently drop a small 8-pin SOIC transceiver like the MCP2551-E to bridge the 5V sensor DSP to an in-vehicle or in-cab CAN backbone. The standby current of 275 µA supports battery-powered sensor parking mode, while the fast loop delay keeps latency below the CAN arbitration gate. Designers should add a CAN bus shield ground connection at the sensor housing to keep EMI out of the analog front-end; the VREF pin helps bias the bus for the host controller's recessive level detection.
Được đề xuất
Industrial IoT Gateways and Edge Bridges
Industrial IoT gateways that aggregate sensor data from CAN-connected machines often use the MCP2551-E as one of multiple bus-side interfaces. At roughly 1.42 USD per unit in 100-piece quantities as of 2026-10-16 it is among the lowest-cost 5V CAN transceivers on the market, and its Microchip second-source ecosystem (the AEC-Q100 upgrade MCP2561) guarantees long-term supply. The slope-control mode is useful in long-cable installations such as wind-turbine pitch systems or substation monitoring, where slow edges reduce ringing on stub branches.
Được đề xuất
Aftermarket Telematics and Diagnostics Tools
Aftermarket OBD-II dongles, fleet telematics devices and CAN-bus loggers often build on the MCP2551-E because of its wide availability, 5V single-supply operation and 1 Mb/s data rate compatible with both 500 kb/s and 250 kb/s real-world vehicle networks. The device's 8-pin SOIC footprint eases installation on custom PCB shields for popular SBC platforms (Raspberry Pi, BeagleBone). Use the RS pin in slope-control mode on the diagnostic port to keep EMI under FCC Part 15 Class B limits for consumer telematics hardware.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MCP2551-E — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MCP2561-E/SN | MCP2562-E/SN | MCP2551T-E/SN | MCP2551-I/SN | SN65HVD251D |
|---|---|---|---|---|---|---|
| Package | SOIC-8 (SN) | SOIC-8 (SN) - same | SOIC-8 (SN) - same | SOIC-8 (SN) - same | SOIC-8 (SN) - same | SOIC-8 (D) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Texas Instruments |
| Max Data Rate | 1 Mb/s | 1 Mb/s | 1 Mb/s | 1 Mb/s | 1 Mb/s | 1 Mb/s |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Operating Temperature | -40°C to +125°C (E) | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | 0°C to +70°C | -40°C to +85°C |
| Bus Fault Voltage | ±40 V | ±40 V | ±40 V | ±40 V | ±40 V | -7 V to +12 V |
| AEC-Q100 Qualified | No | Yes | Yes | No | No | No |
| VREF Pin | Yes (0.5 × VCC) | Yes (SPLIT pin replaces VREF) | Yes (SPLIT pin replaces VREF) | Yes | Yes | Yes |
| Price (1k qty) | $0.96 | $1.05 | $1.10 | $0.96 | $0.78 | $1.20 |
Bảo phân biệt quan trọng
- 24V-tolerant bus pins covered by single BOM line (vsMCP2561-E/SN)
- Wide Microchip second-source ecosystem (vsTI SN65HVD251D)
- Commercial-temp-grade alternates available (vsMCP2551-I/SN)
Ghi chú thiết kế
Place a 100 nF X7R decoupling capacitor within 5 mm of the VCC pin (pin 2) to keep ground-bounce currents out of the digital supply. The CANH and CANL traces must be routed as a 100-Ω differential pair, kept matched to within 0.5 mm of each other, and never routed parallel to switching power traces for more than a few millimetres. Maintain a continuous ground plane under the bus traces to control the differential impedance; a single PCB layer under the SOIC-8 paddle is acceptable since the package has no exposed thermal pad and no thermal via array is required. Keep the CAN bus away from clock-generating crystals and large inductor flybacks.
Do not use the TI SN65HVD230 as a drop-in replacement for the MCP2551-E: the HVD230 is a 3.3V part and will be damaged by a 5V VCC. Use the TI SN65HVD251 (5V) or the Microchip MCP2561 instead. Also ensure the RS pin is not left floating; with no external mode voltage the part's state is undefined and can settle into a high-emission partial state. Tie RS to ground through 10 kΩ for slope-control mode or directly to VCC for standby, or hard-wire to ground for fixed high-speed mode per Microchip datasheet 20001667G.
Implement bus termination only at the two ends of the CAN backbone, never at a stub node. A 120 Ω ±1% resistor in parallel with the bus capacitance keeps the differential rise time controlled. For long (>40 m) backbones split the bus termination to two 60 Ω resistors with a 4.7 nF capacitor to ground in the middle, called split termination, which further attenuates common-mode noise on the pair. Add bidirectional TVS diodes (PESD1CAN or similar) on CANH and CANL near the transceiver connector to clamp ESD and load-dump transients to within ±40V.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified; the Microchip MCP2561 family is the AEC-Q100 upgrade path. Lead-free and halogen-free per Microchip material declarations.
