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Vishay General Semiconductor - Diodes Division SMBJ51A-M3/52
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- Part No.:
- SMBJ51A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51A-M3/52.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,420
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Product details
Overview
SMBJ51A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 51 V standoff voltage (VWM), 56.7–62.7 V breakdown range at 1 mA, 82.4 V maximum clamping voltage at 7.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial and telecom equipment.
For engineers reviewing the SMBJ51A-M3/52 datasheet, SMBJ51A-M3/52 pinout, SMBJ51A-M3/52 application, or SMBJ51A-M3/52 equivalent, key selection criteria include unidirectional polarity, 150 °C max junction temperature, halogen-free RoHS-compliant construction (M3 suffix), and compatibility with automated SMT placement on standard PCB pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage performance and fast response (<1 ns), while low incremental surge resistance minimizes clamping overshoot during transient events.
The SMBJ51A-M3/52 is rated for 600 W peak pulse power under 10/1000 µs waveform with 0.01 % duty cycle, and derates linearly above 25 °C ambient per Fig. 2. Thermal resistance is 100 °C/W junction-to-ambient (on 0.2" × 0.2" copper pads) and 20 °C/W junction-to-lead, enabling reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 51 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - Confirmed breakdown range defining turn-on threshold tolerance |
| VC @ IPPM | 82.4 V at 7.3 A - Clamped voltage during 600 W transient, limiting downstream stress |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform, critical for lightning/surge immunity |
| IPPM | 7.3 A - Corresponding peak pulse current at VC, used to size PCB trace and layout |
| TJ max | 150 °C - Maximum junction temperature enabling use in high-ambient industrial environments |
| Package | SMB (DO-214AA) - Standard surface-mount outline with cathode band marking, compatible with J-STD-020 MSL Level 1 |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, halogen-free (M3 suffix), RoHS-compliant. Cathode indicated by band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased terminal | Connected to protected line; conducts avalanche current during overvoltage |
| Anode (unbanded end) | Reference/ground terminal | Typically tied to system ground or low-impedance return path for clamping |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12–48 V rails |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage (<1 µA at VWM) across temperature and life |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without baking or special handling |
| Halogen-free (M3) | Meets IPC-4101D/21 and JEDEC J-STD-20E environmental compliance for green manufacturing |
| Low clamping ratio (VC/VBR ≈ 1.33) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio TVS devices |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of gate drivers and bus voltage sense circuits against switching-induced transients in 48 V DC motor control systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus or gate-source terminals to clamp inductive kickback spikes. Use Value: Limits transient voltage to ≤82.4 V, preventing gate oxide rupture in 100 V-rated MOSFETs and ensuring functional safety compliance. |
Use Scenario: Input-stage surge suppression on AC/DC front-end rectifiers and DC/DC converter inputs in base station power modules. IC Role / Device Role / Timing Role: Primary-level TVS connected between line and chassis ground to absorb lightning-induced common-mode surges. Use Value: Withstands 600 W pulses without degradation, maintaining protection integrity across 100,000+ surge events per Telcordia GR-1089-CORE. |
| Automotive Body Control Modules | Industrial Sensor Interfaces |
|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load-dump and jump-start transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Unidirectional clamping device mounted at connector entry point, referenced to battery ground. Use Value: Halogen-free M3 construction meets automotive material requirements; 150 °C rating supports under-hood deployment. |
Use Scenario: Shielding analog front-ends of pressure, temperature, and current sensors from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <100 pF) placed directly at connector pins to minimize signal distortion. Use Value: Fast <1 ns response captures sub-microsecond ESD events (IEC 61000-4-2 ±8 kV contact), preserving sensor accuracy and uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A-E3/52 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs M3) | Preferred for commercial-grade non-automotive designs where halogen content is unrestricted | Select E3 for cost-sensitive consumer applications; M3 required for automotive or green procurement mandates |
| SMBJ51CA-M3/52 | Bidirectional variant; symmetric VBR = 56.7–62.7 V, no polarity marking | Used where AC-coupled or dual-polarity signal lines require protection without polarity constraints | Choose CA only if protecting bidirectional buses (e.g., RS-485, CAN); unidirectional SMBJ51A-M3/52 is optimal for DC rails |
Compared with SMBJ51A-E3/52 and SMBJ51CA-M3/52, the SMBJ51A-M3/52 uniquely combines halogen-free compliance, unidirectional clamping, and optimized thermal performance for high-reliability DC power rail protection - making it the preferred choice for automotive and industrial OEMs requiring both environmental and functional assurance.
Availability
SMBJ51A-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and industrial sensor interfaces requiring stable component supply, long-term lifecycle support, and halogen-free compliance.
Supply support for SMBJ51A-M3/52 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, efficiency, and application-specific optimization.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting industrial, automotive, and telecom infrastructure where failure resilience is mission-critical.
FAQ
What is the clamping voltage of SMBJ51A-M3/52 and how is it measured?
The SMBJ51A-M3/52 has a maximum clamping voltage (VC) of 82.4 V, measured at a peak pulse current (IPPM) of 7.3 A using a 10/1000 µs waveform. This value is guaranteed per Vishay Document Number 88392 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ51A-M3/52 maintains this clamping performance across its full operating temperature range and lifetime.
Is SMBJ51A-M3/52 suitable for automotive applications?
The SMBJ51A-M3/52 is halogen-free and RoHS-compliant but not AEC-Q101 qualified in this M3/52 configuration. For automotive use, Vishay specifies AEC-Q101 variants with HE3 or HM3 suffixes (e.g., SMBJ51A-HM3_X). The SMBJ51A-M3/52 is approved for industrial and telecom applications where AEC-Q101 is not mandated, and its 150 °C TJ rating supports under-hood adjacent placement.
How does the M3 suffix differ from E3 in SMBJ51A-M3/52?
The M3 suffix indicates halogen-free, RoHS-compliant construction meeting IPC-4101D/21 and JEDEC J-STD-20E standards, whereas E3 denotes RoHS-compliant but non-halogen-free packaging. Both share identical electrical characteristics and SMB package dimensions. The SMBJ51A-M3/52 is selected when environmental compliance requires bromine/chlorine restrictions - common in EU automotive and industrial OEM supply chains.
What is the thermal resistance of SMBJ51A-M3/52 and how does it affect layout?
The SMBJ51A-M3/52 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 per terminal. This value assumes standard FR-4 PCB; increasing pad area or adding internal copper planes reduces RθJA. Layout must allocate sufficient copper to maintain TJ ≤ 150 °C under worst-case power dissipation, especially during repetitive surge events.
Can SMBJ51A-M3/52 be used for bidirectional signal line protection?
No - SMBJ51A-M3/52 is strictly unidirectional, with cathode marked by a band and intended for DC rail or single-polarity line protection. For bidirectional applications such as RS-485 or CAN bus, the SMBJ51CA-M3/52 variant must be used. Using SMBJ51A-M3/52 on AC or reversible signals risks forward conduction and failure; the SMBJ51A-M3/52 is validated only for reverse-biased transient clamping.
SMBJ51A-M3/52 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ51A-M3/52 FAQ
1.How can I place an order for SMBJ51A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51A-M3/52 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 SMBJ51A-M3/52 reliable?
The price and inventory of SMBJ51A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ51A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51A-M3/52?
SMBJ51A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51A-M3/52 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 SMBJ51A-M3/52?
For technical support, including SMBJ51A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51A-M3/52 requirements.
6.How does Aetrix verify that SMBJ51A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ51A-M3/52 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 SMBJ51A-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ51A-M3/52?
All SMBJ51A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51A-M3/52, 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 SMBJ51A-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ51A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51A-M3/52 Tags
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