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Vishay General Semiconductor - Diodes Division SMBJ51CA-M3/52
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- Part No.:
- SMBJ51CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CA-M3/52.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,090
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Product details
Overview
SMBJ51CA-M3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 51 V standoff voltage (VWM), 600 W peak pulse power (10/1000 µs), and clamps to ≤82.4 V at 7.3 A peak surge current - used to protect MOSFETs, sensor interfaces, and industrial I/O circuits against ESD and inductive switching spikes.
For engineers reviewing the SMBJ51CA-M3/52 datasheet, SMBJ51CA-M3/52 pinout, SMBJ51CA-M3/52 application, or SMBJ51CA-M3/52 equivalent, key selection criteria include bidirectional clamping capability, 51 V working voltage compatibility with 48 V systems, low leakage (<1 µA at VWM), MSL Level 1 reflow rating, and halogen-free RoHS compliance per Vishay's M3 suffix.
Technical Context
This TVS operates symmetrically in both directions, with breakdown voltage VBR specified as 56.7–62.7 V at 1 mA test current and clamping voltage VC = 82.4 V at IPPM = 7.3 A. Its junction-to-lead thermal resistance is 20 °C/W, enabling effective transient energy dissipation without external heatsinking under standard PCB pad layout.
The device uses a glass-passivated silicon junction, achieves <1 ns response time, and maintains stable performance across -55 °C to +150 °C operating junction temperature. It meets UL 497B recognition (QVGQ2) and is rated for repetitive 0.01% duty cycle surges per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before clamping begins; matches 48 V nominal bus systems with 6.25% margin. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - ensures reliable turn-on above system overvoltage threshold while avoiding false triggering. |
| VC @ IPPM | 82.4 V at 7.3 A - defines worst-case clamped voltage seen by protected IC during 600 W transient; limits stress on downstream components. |
| PPPM | 600 W (10/1000 µs waveform) - supports robust protection against lightning-induced surges and inductive kickback in industrial environments. |
| ID @ VWM | <1 µA - negligible standby leakage, critical for low-power sensor nodes and battery-backed circuits. |
| TJ max | +150 °C - enables operation in high-temperature enclosures such as motor drives and outdoor telecom equipment. |
| Package | SMB (DO-214AA) - standardized SMT footprint compatible with automated assembly; 0.205" × 0.130" body size fits dense PCB layouts. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration - no polarity marking; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts surge current in either direction when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., RS-485, CAN) without polarity concerns. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surge events (4 kV line-earth, 2 kV line-line) when mounted per recommended 0.2" × 0.2" copper pads. |
| Halogen-free & RoHS-compliant (M3) | Fulfills environmental compliance requirements for industrial and automotive supply chains without compromising surge robustness. |
| MSL Level 1, 260 °C peak reflow | Supports lead-free soldering without pre-baking; eliminates moisture-related popcorning risk during standard SMT assembly. |
| UL 497B recognized (QVGQ2) | Validated for use in safety-critical telecom and industrial protection circuits requiring third-party certification. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and current-sense amplifiers from inductive flyback spikes during MOSFET/IGBT switching. IC Role / Device Role: Bidirectional TVS placed across DC bus or signal inputs to clamp transients below IC absolute maximum ratings. Use Value: Prevents latch-up or permanent damage to precision analog front-ends and logic controllers exposed to >100 V switching noise. |
Use Scenario: Shielding LIN bus transceivers and microcontroller I/O pins from load dump and jump-start surges in 12 V vehicle networks. IC Role / Device Role: Standoff voltage (51 V) aligns with ISO 7637-2 Pulse 5a requirements; clamps to 82.4 V within safe margin for 3.3 V/5 V logic rails. Use Value: Eliminates need for discrete Zener + series resistor networks while maintaining AEC-Q101-compatible reliability. |
| 48 V Telecom Power Supplies | Industrial Sensor Signal Conditioning |
|
Use Scenario: Safeguarding primary-side controller ICs and optocoupler feedback paths against AC line surges and hot-swap transients in PoE-powered infrastructure. IC Role / Device Role: Placed across input bulk capacitor or auxiliary bias winding to limit transient overvoltage during fault conditions. Use Value: Maintains system uptime by preventing controller reset or bootstrap circuit failure during repeated 600 W surge events. |
Use Scenario: Guarding analog outputs (4–20 mA, 0–10 V) and digital I/O (RS-232/422) of PLC modules against ESD and field wiring faults. IC Role / Device Role: Low-capacitance (<50 pF typical) bidirectional TVS minimizes signal distortion while providing ±82.4 V clamping. Use Value: Preserves measurement accuracy and communication integrity in harsh factory-floor environments with frequent cable disconnects. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA-E3/52 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Preferred for commercial-grade designs where halogen content is unrestricted. | Select E3 for cost-sensitive non-automotive applications; M3 required for halogen-free mandates. |
| SMAJ51CA-13-F | Lower peak power (400 W), SMA package (smaller footprint, higher RθJA = 140 °C/W). | Suitable only for lower-energy transients; less robust thermal performance under sustained surge duty. | Choose SMAJ51CA-13-F only if board space is constrained and surge threat level is limited to IEC 61000-4-2 Level 3. |
Compared with SMBJ51CA-E3/52, the M3 variant adds halogen-free compliance without altering clamping behavior; versus SMAJ51CA-13-F, SMBJ51CA-M3/52 delivers 50% higher surge power handling and superior thermal dissipation for mission-critical industrial deployments.
Availability
SMBJ51CA-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and 48 V telecom power supplies requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ51CA-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, and protection devices with emphasis on reliability, power handling, and automotive qualification.
The SMBJ series targets high-energy transient suppression in harsh environments, engineered specifically for industrial automation, transportation, and infrastructure systems demanding certified surge resilience.
FAQ
What is the clamping voltage of SMBJ51CA-M3/52 at its rated peak pulse current?
The SMBJ51CA-M3/52 clamps to a maximum of 82.4 V at its specified peak pulse current of 7.3 A (10/1000 µs waveform). This value is measured under standard test conditions with 0.2" × 0.2" copper pads per terminal and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ51CA-M3/52 maintains this clamping performance across its full operating temperature range.
Is SMBJ51CA-M3/52 suitable for automotive applications?
SMBJ51CA-M3/52 itself is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the functionally identical SMBJ51CA-HM3_X variant (e.g., SMBJ51CA-HM3_A) with full AEC-Q101 qualification. For automotive body control or infotainment systems requiring qualification, the HM3_X version must be selected - the SMBJ51CA-M3/52 remains appropriate for non-automotive industrial and telecom use cases.
How does the bidirectional design of SMBJ51CA-M3/52 affect its PCB layout?
The SMBJ51CA-M3/52 has no polarity marking and functions identically in both directions, simplifying PCB layout by eliminating orientation constraints during placement. Engineers can route it across any two nodes requiring symmetrical overvoltage protection - such as differential data lines (RS-485, CAN) or AC-coupled sensors - without verifying anode/cathode alignment. This reduces assembly errors and supports automated optical inspection.
What is the maximum steady-state power dissipation of SMBJ51CA-M3/52?
The SMBJ51CA-M3/52 has a maximum steady-state power dissipation (PD) of 5.0 W at 50 °C ambient temperature with infinite heatsink conditions. In real-world PCB mounting (0.2" × 0.2" copper pads), derating applies per Figure 2 in the datasheet; at 70 °C ambient, usable continuous power drops to approximately 3.5 W. This rating governs thermal design for sustained leakage or low-duty-cycle surge scenarios.
Does SMBJ51CA-M3/52 meet UL safety certification?
Yes, SMBJ51CA-M3/52 is UL recognized under file E136766 for both unidirectional and bidirectional configurations, compliant with UL 497B for signal and power line protectors. This certification validates its suitability in safety-critical end equipment including industrial control panels, telecom infrastructure, and building automation systems requiring third-party verified surge protection.
SMBJ51CA-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:
- -
- 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-M3/52 FAQ
1.How can I place an order for SMBJ51CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CA-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 SMBJ51CA-M3/52 reliable?
The price and inventory of SMBJ51CA-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 SMBJ51CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ51CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CA-M3/52?
SMBJ51CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CA-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 SMBJ51CA-M3/52?
For technical support, including SMBJ51CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CA-M3/52 requirements.
6.How does Aetrix verify that SMBJ51CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ51CA-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 SMBJ51CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ51CA-M3/52?
All SMBJ51CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CA-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 SMBJ51CA-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ51CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CA-M3/52 Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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