MCP2551-I/SN - High-Speed CAN Transceiver, 1Mb/s, ISO-11898 | Microchip
N.º de pieza: MCP2551-I-SN ⚠ Última compra| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.1 | $1,10 |
| 10 | $0.99 | $9,90 |
| 100 | $0.88 | $88,00 |
| 500 | $0.79 | $395,00 |
| 1.000 | $0.71 | $710,00 |
MCP2551-I-SN Descripción general
A CAN transceiver is a physical-layer (PHY) device that converts the single-ended TTL-level transmit (TXD) and receive (RXD) signals of a CAN controller into the differential CAN_H and CAN_L signals driven on the bus. Transceivers such as the MCP2551 provide the dominant/recessive arbitration signaling, bus biasing, ESD protection, and fault tolerance needed by the differential multi-drop CAN bus used in automotive and industrial networking. They sit between the bus and protocol controllers such as the Microchip MCP2515 or the MCU-integrated CAN modules on dsPIC, PIC18, and many ARM Cortex-M microcontrollers.
Key features of the MCP2551-I/SN include 1 Mb/s maximum data rate, externally-controlled slope (rise/fall) adjustment for reduced RFI, a low-current standby mode, a VREF output for the CAN controller's input reference, and detection of permanent bus dominant faults with automatic recovery to receiver-only mode. The device also supports the -2 V to +7 V common-mode range required by ISO-11898-2 (extended common-mode versions go further) and includes thermal shutdown and current limiting on the bus pins for bus-fault protection.
Architecturally, the MCP2551 uses an NMOS differential driver on the bus side with slope control implemented by varying the driver output current; a bandgap-based VREF generator provides a 2.5 V (typical) reference for the RXD comparator threshold generation inside the controller. Internal hysteresis and input filtering suppress RF and transient noise on CAN_H/CAN_L without delaying the bit time, which preserves CAN arbitration timing at the maximum 1 Mb/s data rate.
Typical applications include automotive body and powertrain networks, industrial CAN-based control systems (CANopen, DeviceNet, NMEA 2000), building automation, HVAC controls, and any embedded design using a Microchip MCU with a CAN module. Its 8-SOIC footprint and 5 V supply make it easy to add a CAN physical layer to existing 5 V designs. Note: per Microchip's discontinuance notices, the MCP2551 in SOIC-8 (SN) is being phased out, so verify stock and review the recommended MCP2561/2562 successor family for new designs.
When designing with this device, observe CAN bus termination: place 120 ohm resistors at each END of the bus (not at every node), and use twisted-pair cabling. Provide a small decoupling capacitor as close as possible to VDD (pin 3) and tie the unused RS pin (pin 8) to GND through a resistor (or directly) to select normal high-speed slew rate.
This page synthesizes distributor pricing, drop-in alternatives, and practical PCB/CAN-bus design notes not found in a single manufacturer datasheet.
Alternativas directas para MCP2551-I-SN — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MCP2551-I-SN (mismo factor de forma y huella) — difiere en Operating Temperature, Package, Protocol, Supply Voltage.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MCP2561-I/SN
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MCP2562-I/SN
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MCP2551-E/SN
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MCP2551T-I/SN
✅ Sustitución directa✓ En stock
$1.0218 / unidad
Ver hoja de datos →SN65HVD251D
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SN65HVD230DR
✅ Sustitución directa✓ En stock
$0.94 / unidad
Ver hoja de datos →MCP2551-I-SN Especificaciones
| Función | High-Speed CAN Transceiver |
| Protocol | CANbus (ISO-11898) |
| Number of Drivers/Receivers | 1/1 |
| Data Rate (max) | 1 Mb/s |
| Tensión de alimentación | 4.5 V to 5.5 V |
| Common-Mode Range | -2 V to +7 V (typical ISO-11898-2) |
| Temperatura de funcionamiento | -40 C to +125 C (Industrial, I grade) |
| Encapsulado | 8-pin SOIC (SN, 0.154" / 3.90 mm width) |
| Tipo de montaje | Surface Mount |
| Slope Control | Yes (RS pin, externally adjustable) |
| Standby Mode | Yes (low-current via Rs pin) |
| VREF Output | Yes (approx. VDD/2) |
| Bus Dominant Fault Detection | Yes (automatic receiver-only mode) |
| Nivel MSL | 1 (per JEDEC J-STD-020, not explicitly stated in source) |
Configuración de pines de MCP2551-I-SN
| Pin 1 | TXD — Transmit Data Input from CAN controller (TTL) |
| Pin 2 | VDD — Supply Voltage (4.5 V to 5.5 V) |
| Pin 3 | VDD — Supply Voltage (pin tied to pin 2) |
| Pin 4 | RXD — Receive Data Output to CAN controller (TTL) |
| Pin 5 | VREF — Reference Voltage Output (~VDD/2) |
| Pin 6 | CANL — CAN Bus Low-Level Differential Line |
| Pin 7 | CANH — CAN Bus High-Level Differential Line |
| Pin 8 | RS — Slope Control / Standby Mode Input |
Aplicaciones típicas
MCP2551-I-SN es adecuado para 7 aplicacións: Automotive Body and Powertrain CAN Networks, Industrial CANopen / DeviceNet Systems, Building Automation (BACnet/Modbus over CAN), Marine NMEA 2000 Networks, Robotics and Motion Control Buses, Medical Device Communication Interfaces, EV Charging (Electric Vehicle Supply Equipment).
Automotive Body and Powertrain CAN Networks
The MCP2551-I/SN is the dominant physical-layer device for 12 V automotive CAN networks that connect ECUs in body controllers, instrument clusters, HVAC, seat modules, door nodes, and engine management systems. Its ISO-11898 compliance includes the 24 V load specification required for jump-start and load-dump transients in 12 V/24 V systems. Combined with a CAN controller (such as the Microchip MCP2515 or an MCU-integrated CAN module on dsPIC33/PIC18), the MCP2551 achieves reliable 500 kbit/s body-CAN and 1 Mbit/s powertrain communication. The maximum 1 Mb/s data rate supports high-speed powertrain buses, while the externally-controlled slope input lets designers dial in slew rate for EMC compliance. Industrial temperature rating (-40 to +125 C) and integrated bus-dominant fault handling match automotive environmental and reliability requirements, though AEC-Q100 specific grades may be required for safety-critical use.
Recomendado
Industrial CANopen / DeviceNet Systems
In industrial automation, the MCP2551-I/SN provides the differential bus driver for CANopen and DeviceNet networks that link PLCs, motor drives, sensors, and remote I/O over distances up to a few hundred meters. Its low-current standby mode supports CANopen power-saving strategies, while the externally-controlled slew rate (RS pin) enables compliance with DeviceNet's required edge-rate shaping to limit RFI in industrial plants. Used with an industrial CAN controller (MCP2515 or MCU-internal CAN peripherals), the MCP2551-I/SN delivers 125 kbit/s CANopen or 250/500 kbit/s DeviceNet reliably in electrically noisy factory environments. Common-mode range and ESD protection on the bus pins also handle the surge events common in industrial installations, making the part a workhorse for decades in industrial CAN hardware from PLC digital I/O modules to servo amplifiers.
Recomendado
Building Automation (BACnet/Modbus over CAN)
The MCP2551-I/SN can serve as the physical interface for CAN-based building automation protocols including BACnet MS/TP over CAN, Modbus RTU over CAN, and proprietary HVAC control networks. Its wide supply tolerance (4.5-5.5 V) accommodates the standard 24 V building-automation rail regulated down locally to 5 V, while its industrial temperature grade supports rooftop and mechanical-room deployments. In HVAC controllers, variable air volume (VAV) boxes, and chiller/boiler controls, the MCP2551-I/SN provides the multi-drop differential bus that lets dozens of devices share a single twisted pair. The ability to put the device into low-power standby via the RS pin also enables energy-saving operation in zones that only need occasional bus communication, which aligns with ASHRAE Guideline 36 and modern green-building HVAC strategies.
Recomendado
Marine NMEA 2000 Networks
The MCP2551-I/SN provides the CAN physical layer required by NMEA 2000, the marine electronics networking standard that links GPS chart plotters, fish finders, autopilots, engine instruments, and tank sensors. NMEA 2000 is built on ISO 11898 high-speed CAN operating at 250 kbit/s with a defined backbone/backbone layout, for which the MCP2551's 1 Mb/s capability provides ample headroom. The MCP2551-I/SN's industrial temperature range is fully appropriate for marine engine rooms and bilge installations, and its bus-dominant fault and thermal shutdown features protect the bus when a sensor or cable is misbehaving. Tying the RS pin to GND selects high-speed mode with maximum slew, which is the NMEA 2000 default configuration. Pairs of 120 ohm termination resistors at each end of the NMEA 2000 backbone complete a robust differential bus even in the presence of significant motor-cycle RFI.
Recomendado
Robotics and Motion Control Buses
Robotics platforms from small hobby-class designs to industrial arms use CAN to coordinate motor controllers, sensor arrays, and central controllers. The MCP2551-I/SN delivers the deterministic differential bus needed in multi-axis servo systems where delay or jitter on command packets would impact motion quality. Operating from a single 5 V rail that motor driver boards already provide, the part drops easily onto existing robot power-distribution boards. The slope control feature is particularly useful in motion systems because stepper and BLDC motor drivers generate substantial high-frequency noise on power grounds, and slowing the bus edges reduces coupling into nearby analog and feedback channels. Combined with a dsPIC33 or PIC32 controller, the MCP2551-I/SN forms a low-cost backbone for distributed-joint architectures in robotics research, education, and professional platforms.
Recomendado
Medical Device Communication Interfaces
Medical electronics increasingly use CAN (and CAN FD) for internal communication among sensor boards, motor controllers, and central processors inside devices such as infusion pumps, ventilators, dialysis machines, and diagnostic analyzers. The MCP2551-I/SN provides a galvanically tolerant (within the common-mode range), robust differential interface that withstands ESD events from human-machine contact and shared supply environments. Its compact 8-SOIC footprint fits the tight PCB layouts of compact medical instruments, and its industrial temperature grade covers the operating envelope of most clinical and laboratory environments. For medical safety-critical designs, the MCP2551-I/SN is typically used together with additional isolation (digital isolators or isolated DC-DC) to meet IEC 60601 patient-leakage requirements. Designers should verify that AEC-Q100 equivalent and ISO 13485 traceability considerations are addressed by the chosen alternative for medical certification.
Recomendado
EV Charging (Electric Vehicle Supply Equipment)
Electric vehicle supply equipment (EVSE) and DC fast-charging stations use CAN between the charging control unit and the vehicle's BMS, following ISO 15118-derived stacks and the legacy CHAdeMO protocols. The MCP2551-I/SN's ISO-11898 compatibility including 24 V load tolerance makes it suitable for the 12 V auxiliary rails of EVSE cabinets where CAN serves as the physical link for handshake and status frames. With 1 Mb/s headroom, the device supports both 125 kbit/s control-class CAN and higher-rate diagnostic CAN used in fault logging and connection-state machines. The bus-dominant fault detection and thermal shutdown of the MCP2551-I/SN protect the controller's MCU and downstream electronics from a misbehaving EV-side bus, which is valuable in the high-energy EVSE environment where single-point failures have costly consequences. Newer designs favor the MCP2561/2562 family for its enhanced features and continued production.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MCP2551-I-SN — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MCP2561-I/SN | MCP2562-I/SN | MCP2551-E/SN | MCP2551T-I/SN | SN65HVD251D | SN65HVD230D |
|---|---|---|---|---|---|---|---|
| Package | 8-SOIC (SN, 0.154" width) | 8-SOIC (SN) - same | 8-SOIC (SN) - same | 8-SOIC (SN) - same | 8-SOIC (SN) - same | 8-SOIC (D) - same footprint | 8-SOIC (D) - same footprint |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Texas Instruments | Texas Instruments |
| Function | High-speed CAN transceiver | High-speed CAN transceiver (improved) | High-speed CAN transceiver (improved) | High-speed CAN transceiver (Extended grade) | High-speed CAN transceiver | High-speed CAN transceiver | 3.3 V-tolerant CAN transceiver |
| Data Rate (max) | 1 Mb/s | 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 | 3.0 V to 3.6 V (3.3 V native) |
| Slope Control / RS Pin | Yes | Yes | Yes | Yes | Yes | Yes (pin-to-pin equivalent function) | Yes |
| Standby Mode | Yes (RS = HIGH) | Yes | Yes | Yes (RS = HIGH) | Yes (RS = HIGH) | Yes (pin-to-pin equivalent) | Yes (receiver-active in standby) |
| VREF Output | Yes (~VDD/2) | Yes | Yes | Yes | Yes | Yes (pin-to-pin equivalent) | Yes |
| Operating Temperature | -40 C to +125 C (Industrial) | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C (Extended) | -40 C to +125 C | -40 C to +85 C (commercial-extended per TI datasheet) | -40 C to +85 C |
| Approx. Unit Price (qty 1000) | $0.71 | $0.85 - $1.10 (active part) | $0.90 - $1.20 (active part) | $1.00 - $1.40 (E grade premium) | $0.80 - $1.10 (tape and reel) | $1.20 - $1.80 | $1.10 - $1.60 |
Diferenciadores clave
- Cross-brand pin-to-pin equivalent available (TI SN65HVD251D) (frente a SN65HVD251D)
- Microchip-authorized drop-in successor available (MCP2561-I/SN) (frente a MCP2561-I/SN)
- Explicit 24 V system support per ISO-11898 (frente a SN65HVD230D)
- Long design heritage and documentation breadth (frente a MCP2561-I/SN)
Notas de diseño
Per the Microchip MCP2551 datasheet, place a 0.1 uF decoupling capacitor as close as possible to the VDD pins (2 and 3) of the MCP2551, with the shortest possible ground return path. The bus pins (CANH, CANL) should be routed with matched impedance (typically 120 ohms differential) to the transceiver with no stubs to the bus cable. Keep CAN traces away from switching converter edges and clock signals that would couple common-mode noise into the bus.
A common pitfall when laying out a CAN bus is excessive stub length to drop nodes - stubs reflect on the bus and corrupt CAN frames at high bit rates. Each CAN node should be tapped from the backbone with a stub shorter than approximately 0.3 m for 1 Mb/s and shorter than 1.0 m at 125 kbit/s. Place the two 120 ohm termination resistors at the physical ends of the bus, NOT at every node. These terminations are essential for matching the cable's characteristic impedance and preventing reflections.
When interfacing the MCP2551-I/SN to a microcontroller, ensure that the TXD pin is driven at the level expected by the transceiver's TXD input threshold (typically CMOS with VIL <= 0.4 V and VIH >= 2.0 V). The MCP2551 is a 5 V device, and although its logic inputs are 3.3 V tolerant thanks to the wide supply, the TXD pin may not properly meet the higher VDD-based thresholds in all cases; use a Schottky diode or level shifter if your MCU is 3.3 V and you observe intermittent TXD behavior.
If you replace the MCP2551-I/SN with the TI SN65HVD251 (a popular pin-to-pin equivalent), double-check that your application is not exposed to 24 V bus loads - the HVD251 is optimized for 12 V systems, while the MCP2551 explicitly includes the 24 V specification per ISO-11898. For 24 V industrial or commercial-vehicle CAN networks, the original MCP2551 family or the MCP2561/2562 family remains the better choice.
Although the 8-SOIC package of the MCP2551-I/SN has a typical theta_JA of approximately 80-100 C/W, that thermal budget does not normally impact normal CAN-bus operation because the dominant-stage current is limited by internal circuitry. In high-load bus-fault conditions (one node driving the bus dominant continuously), the bus drivers' thermal shutdown can be reached. Trust the internal protection and verify system-level behavior rather than sizing an external heatsink.
Información de cumplimiento
RoHS/REACH compliance per Microchip material declarations and distributor data. AEC-Q100 qualification is not stated for the I/SN grade (industrial temperature); AEC-Q100 qualified variants exist as separate MCP2551 orderable part numbers. Halogen-free status not explicitly stated in verified web data.
