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Vishay General Semiconductor - Diodes Division SMBJ51CA-M3/5B
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- Part No.:
- SMBJ51CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CA-M3/5B.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,733
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Product details
Overview
SMBJ51CA-M3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V standoff voltage (VWM), 600 W peak pulse power (10/1000 µs), clamping voltage of 82.4 V at 7.3 A peak surge current, and operates across –55 °C to +150 °C junction temperature - deployed on signal lines and power rails in industrial sensor interfaces and telecom front-end circuits.
For engineers reviewing the SMBJ51CA-M3/5B datasheet, SMBJ51CA-M3/5B pinout, SMBJ51CA-M3/5B application, or SMBJ51CA-M3/5B equivalent, key selection criteria include bidirectional clamping behavior, low clamping ratio (VC/VWM ≈ 1.62), halogen-free RoHS-compliant construction (M3 suffix), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads per JEDEC standard.
Technical Context
This device functions as a voltage-clamping protector using an avalanche breakdown mechanism triggered by transients exceeding its reverse standoff voltage (VWM = 51 V). Its bidirectional symmetry ensures identical clamping performance in both polarities, eliminating polarity marking requirements and simplifying layout in AC-coupled or differential signal paths.
The SMBJ51CA-M3/5B delivers fast response time (<1 ps), low incremental surge resistance, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its thermal resistance (RθJA = 100 °C/W) and 5.0 W steady-state power dissipation support reliable operation under repetitive surge conditions when mounted on recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - Breakdown voltage tolerance band; ensures predictable turn-on threshold across production lots. |
| VC @ IPPM | 82.4 V at 7.3 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability; enables suppression of high-energy transients like EFT and lightning-induced surges. |
| IPPM | 7.3 A - Peak surge current supported at rated waveform; defines minimum trace/solder joint robustness required. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in high-ambient environments such as industrial motor drives. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; optimized for automated pick-and-place and thermal pad routing. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Cathode/anode terminals are symmetrical; both leads serve as interchangeable surge current paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry (negative polarity) | Accepts transient energy during negative excursions; forms one half of symmetrical clamping path. |
| Anode | Surge current exit (positive polarity) | Provides return path during positive transients; completes bidirectional conduction loop with cathode terminal. |
| Cathode | Surge current entry (positive polarity) | Accepts transient energy during positive excursions; forms second half of symmetrical clamping path. |
| Cathode | Surge current exit (negative polarity) | Provides return path during negative transients; ensures equal clamping in both directions without polarity dependency. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both polarities - eliminates need for orientation verification during assembly and supports AC signal line protection. |
| 600 W peak pulse power | Withstands 10/1000 µs surges up to 7.3 A - meets IEC 61000-4-5 Level 3 (1 kV line-to-line, 2 kV line-to-ground) without derating. |
| Halogen-free & RoHS-compliant (M3) | Meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability - suitable for automotive and industrial applications requiring strict material compliance. |
| Low clamping ratio (VC/VWM) | 1.62 - Minimizes overvoltage stress on protected ICs compared to alternatives with ratios >1.8, improving system-level ESD/EFT margin. |
| MSL Level 1 rating | 260 °C peak reflow compatibility - allows single-pass soldering without moisture sensitivity concerns or baking requirements. |
Applications
| Industrial Sensor Signal Protection | Telecom Line Interface Protection |
|---|---|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA, 0–10 V) of pressure/temperature sensors exposed to inductive switching noise in factory automation cabinets. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at connector entry point to shunt transients before reaching precision ADC or op-amp input stages. Use Value: Limits induced surges to ≤82.4 V, preserving sensor accuracy and preventing latch-up in downstream instrumentation amplifiers. |
Use Scenario: Safeguarding RS-485 transceivers and Ethernet PHYs against lightning-induced surges on outdoor telecom drop cables and base station backhaul links. IC Role / Device Role / Timing Role: Bidirectional surge suppressor installed between differential pair and transceiver, referenced to local ground plane. Use Value: Maintains signal integrity under repeated 600 W surges while meeting IEC 61000-4-5 immunity requirements for outdoor infrastructure. |
| Automotive Body Control Module (BCM) | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding LIN bus nodes and CAN transceivers from load dump and jump-start transients in vehicle body electronics modules. IC Role / Device Role / Timing Role: Secondary-level TVS on LIN/CAN data lines, coordinated with primary battery-side suppressors to manage energy distribution. Use Value: Withstands 100 A IFSM pulses and operates reliably at +125 °C ambient, supporting AEC-Q101-qualified variants in same family. |
Use Scenario: Suppressing commutation spikes generated by brushed DC motors in washing machines, HVAC blowers, and power tools. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to clamp inductive kickback before it couples into MCU power rails or control logic. Use Value: Prevents reset events and EEPROM corruption in microcontrollers by limiting spike amplitude to <83 V at full-rated surge current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA-E3/5B | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3); tin-lead compatible finish. | Preferred for commercial-grade assemblies where halogen content is unrestricted and legacy solder processes apply. | Select E3 when cost-sensitive commercial designs require RoHS compliance without halogen-free mandate. |
| SAC51CA | Same VWM/VC but lower PPPM (400 W); smaller SOD-123 package; higher RθJA (150 °C/W). | Suitable only for low-energy transients (e.g., ESD-only) in space-constrained consumer PCBs; not for lightning or inductive switching. | Choose SAC51CA only if board area is critical and surge threat level is limited to IEC 61000-4-2 ±15 kV contact discharge. |
Compared with SMBJ51CA-M3/5B, the E3 variant offers identical protection performance with broader solder process compatibility, while the SAC51CA trades power handling and thermal robustness for miniaturization - making the SMBJ51CA-M3/5B optimal for industrial and telecom applications demanding full 600 W surge resilience.
Availability
SMBJ51CA-M3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and appliance motor drive circuits requiring stable component supply and halogen-free compliance.
Supply support for SMBJ51CA-M3/5B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting industrial automation, telecommunications infrastructure, and automotive subsystems where robustness and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ51CA-M3/5B at its rated peak pulse current?
The SMBJ51CA-M3/5B has a maximum clamping voltage (VC) of 82.4 V at its rated peak pulse current (IPPM) of 7.3 A under a 10/1000 µs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ51CA-M3/5B maintains this clamping performance symmetrically in both directions due to its bidirectional design.
Is SMBJ51CA-M3/5B suitable for automotive applications?
The SMBJ51CA-M3/5B itself is commercial-grade and not AEC-Q101 qualified; however, it belongs to the SMBJ family that includes AEC-Q101 variants (e.g., SMBJ51CAHM3_B/I). For automotive use, engineers must select the HM3-suffixed version with underscored revision code. The SMBJ51CA-M3/5B remains appropriate for non-safety-critical automotive test equipment or aftermarket systems where qualification is not mandated.
How does the M3 suffix affect the SMBJ51CA-M3/5B's compliance and assembly process?
The M3 suffix indicates halogen-free, RoHS-compliant construction with matte tin-plated leads meeting J-STD-002 and JESD 22-B102 solderability standards. It also satisfies JESD 201 Class 2 whisker resistance. These properties ensure compatibility with lead-free reflow profiles (peak 260 °C, MSL Level 1) and eliminate halogen-related corrosion risks in humid or high-reliability environments. The SMBJ51CA-M3/5B requires no special handling beyond standard SMT practices.
Can SMBJ51CA-M3/5B be used in place of a unidirectional TVS like SMBJ51A-M3/5B?
No - SMBJ51CA-M3/5B is strictly bidirectional and lacks polarity marking, whereas SMBJ51A-M3/5B is unidirectional with cathode band identification. Substituting them requires verifying circuit topology: bidirectional use is mandatory for AC-coupled, differential, or floating signal lines; unidirectional types are required where DC bias or polarity-dependent conduction is present. Using SMBJ51CA-M3/5B in a unidirectional design may cause unintended conduction during normal operation.
What is the thermal resistance and power derating behavior of SMBJ51CA-M3/5B?
The SMBJ51CA-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads. Its 5.0 W steady-state power dissipation derates linearly above 25 °C ambient, dropping to zero at 75 °C per Vishay's Fig. 2. This derating curve ensures safe operation under sustained leakage or repetitive surge conditions. The SMBJ51CA-M3/5B must be routed with adequate copper area to maintain thermal performance.
SMBJ51CA-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ51CA-M3/5B FAQ
1.How can I place an order for SMBJ51CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CA-M3/5B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMBJ51CA-M3/5B reliable?
The price and inventory of SMBJ51CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ51CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CA-M3/5B?
SMBJ51CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CA-M3/5B order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMBJ51CA-M3/5B?
For technical support, including SMBJ51CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ51CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ51CA-M3/5B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMBJ51CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ51CA-M3/5B?
All SMBJ51CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CA-M3/5B, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMBJ51CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ51CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CA-M3/5B Tags
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