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Vishay General Semiconductor - Diodes Division SMBG51CA-M3/5B
- Part No.:
- SMBG51CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG51CA-M3/5B.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,336
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Product details
Overview
SMBG51CA-M3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of signal and power lines. It features a 51 V stand-off voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), clamping voltage of 82.4 V at 7.3 A, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMBG51CA-M3/5B datasheet, SMBG51CA-M3/5B pinout, SMBG51CA-M3/5B application, or SMBG51CA-M3/5B equivalent, this device is selected for high-reliability transient suppression in automotive sensor interfaces, industrial I/O ports, and telecom line protection where bidirectional surge immunity, low clamping ratio, and halogen-free RoHS compliance are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at 51 V), while the low incremental surge resistance enables tight clamping under fast transients.
The device is rated for 150 °C maximum junction temperature and exhibits a thermal resistance of 100 °C/W (junction-to-ambient) on standard 5.0 mm × 5.0 mm copper pads. It meets J-STD-020 MSL Level 1 and withstands 260 °C lead-free reflow peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - Ensures reliable turn-on within defined tolerance band under ESD/surge stress |
| VC @ IPPM | 82.4 V at 7.3 A - Clamping voltage during 600 W 10/1000 µs surge, limiting downstream voltage stress |
| PPPM | 600 W - Peak pulse power handling capability per single transient event (0.01% duty cycle) |
| ID @ VWM | ≤1.0 µA - Ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - Enables operation in under-hood automotive and industrial environments |
| Qualification | AEC-Q101 qualified - Validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 6.48 mm × 3.94 mm × 2.41 mm (L × W × H); matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | One terminal of symmetrical junction; conducts during positive surges relative to cathode reference |
| Cathode | Transient current entry (negative half-cycle) | Second terminal of symmetrical junction; conducts during negative surges - functionally identical to anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional symmetry | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout in AC-coupled or floating lines |
| Halogen-free & RoHS | M3 suffix indicates halogen-free molding compound and RoHS compliance - meets automotive environmental requirements |
| 600 W surge rating | Handles IEC 61000-4-5 Level 4 (4 kV) surges when properly mounted - suitable for industrial fieldbus and CAN FD protection |
| AEC-Q101 qualification | Validated for automotive applications including engine control, ADAS sensors, and infotainment interfaces |
| Low clamping ratio | VC/VWM = 1.62 - minimizes voltage overshoot during transients compared to competing 51 V TVS devices |
Applications
| Automotive Sensor Protection | Industrial Fieldbus Interface |
|---|---|
Use Scenario: Protecting LIN/CAN bus nodes and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, absorbing ±1 kV/500 A transients without degradation. Use Value: Prevents latch-up or permanent damage to MCU GPIOs and analog front-ends while maintaining signal fidelity below 51 V normal operation. | Use Scenario: Shielding RS-485/RS-422 transceivers and PLC I/O modules from lightning-induced surges and EFT bursts in factory automation systems. IC Role / Device Role / Timing Role: Primary line-side TVS on differential pair inputs, clamping common-mode transients before they reach isolation barriers or receiver inputs. Use Value: Enables compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) up to Level 4 without additional filtering components. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Safeguarding Ethernet PHYs, DSL line drivers, and POTS interface ICs against induced surges from nearby power lines or antenna coupling. IC Role / Device Role / Timing Role: Secondary protection device downstream of gas discharge tubes (GDTs), providing fast-response clamping after primary coarse protection. Use Value: Reduces residual clamping voltage to <85 V, protecting 100 V-rated Ethernet magnetics and PHY ESD structures. | Use Scenario: Overvoltage protection on AC-DC adapter input rectifier outputs and DC-DC converter inputs exposed to mains transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor or input rail, shunting surge energy away from switching controllers and electrolytic capacitors. Use Value: Extends product lifetime by preventing repeated overvoltage stress on primary-side MOSFETs and controller ICs during brownout recovery events. |
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-M3/5B | Same VWM/VBR/VC, but lower PPPM = 600 W (same rating), different package: SMB (DO-214AA), slightly larger footprint (4.57 mm × 3.94 mm vs. SMBG's 6.48 mm × 3.94 mm) | Less suitable for ultra-dense layouts; higher RθJA (110 °C/W) reduces thermal margin in sealed enclosures | Select SMBG51CA-M3/5B when board space is constrained and thermal performance at elevated ambient is critical. |
| SMCJ51CA-M3/5B | Same VWM/VBR, but higher PPPM = 1500 W; larger SMC (DO-214AB) package (7.11 mm × 6.22 mm) | Overqualified for 600 W needs; introduces unnecessary cost and PCB area unless system-level surge testing exceeds IEC 61000-4-5 Level 4 | Choose SMBG51CA-M3/5B for cost-sensitive, space-constrained designs meeting standard automotive and industrial surge requirements. |
Compared with SMBJ51CA-M3/5B and SMCJ51CA-M3/5B, SMBG51CA-M3/5B delivers identical electrical protection in a smaller, thermally optimized package-ideal for next-generation ADAS modules and miniaturized industrial gateways where footprint and thermal resistance directly impact system reliability.
Availability
SMBG51CA-M3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial fieldbus protection, and telecom line conditioning requiring stable component supply, halogen-free compliance, and AEC-Q101 assurance.
Supply support for SMBG51CA-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, TVS, MOSFETs, and optoelectronics with emphasis on reliability and application-specific performance.
The SMBG series was developed for high-density, high-reliability transient suppression in automotive and industrial environments-prioritizing low-profile packaging, AEC-Q101 qualification, and consistent bidirectional clamping behavior.
FAQ
What does the "CA" suffix indicate in SMBG51CA-M3/5B?
The "CA" suffix denotes a bidirectional configuration: SMBG51CA-M3/5B provides symmetrical transient suppression in both polarities, with identical breakdown and clamping characteristics for positive and negative surges. This eliminates polarity marking on PCB silkscreen and simplifies layout for AC-coupled or floating signal lines. Unlike unidirectional variants (e.g., SMBG51A), the CA version has no cathode band and is used where voltage transients may occur in either direction.
Is SMBG51CA-M3/5B suitable for automotive applications?
Yes, SMBG51CA-M3/5B is AEC-Q101 qualified and explicitly rated for automotive use. Its construction-including halogen-free molding compound (M3 suffix), matte tin-plated leads, and validation across temperature cycling, high-temperature reverse bias (HTRB), and accelerated life testing-meets stringent automotive reliability requirements. It is deployed in engine control units, body electronics, and ADAS sensor interfaces where transient immunity must be guaranteed over 15-year service life.
How does the SMBG (DO-215AA) package differ from SMB (DO-214AA) in SMBG51CA-M3/5B?
The SMBG (DO-215AA) package used in SMBG51CA-M3/5B is dimensionally distinct from SMB (DO-214AA): it is longer (6.48 mm vs. 4.57 mm) but maintains the same width (3.94 mm) and height (2.41 mm). This elongated shape improves thermal dissipation-RθJA is 100 °C/W versus ~110 °C/W for SMB-making SMBG51CA-M3/5B better suited for high-power-density automotive modules where junction temperature rise must be minimized during repetitive surge events.
What is the maximum clamping voltage of SMBG51CA-M3/5B under surge conditions?
The maximum clamping voltage (VC) of SMBG51CA-M3/5B is 82.4 V at a peak pulse current (IPPM) of 7.3 A, measured with a 10/1000 µs waveform. This value represents the upper limit of voltage seen by protected circuitry during a full 600 W transient event. The clamping ratio (VC/VWM = 1.62) confirms efficient energy diversion, and the specification is guaranteed across -55 °C to +150 °C operating range per Vishay's datasheet revision 09-Jan-2024.
Does SMBG51CA-M3/5B require derating at elevated ambient temperatures?
Yes, SMBG51CA-M3/5B requires thermal derating above 25 °C ambient. Per Figure 2 in the Vishay datasheet, its peak pulse power (PPPM) decreases linearly to 50% at 100 °C ambient and reaches zero at 150 °C. For example, at 85 °C ambient, maximum allowable PPPM is ~360 W. Designers must apply this derating curve when sizing PCB copper pads and estimating worst-case surge survival in sealed enclosures or under-hood locations.
SMBG51CA-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- 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:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG51CA-M3/5B FAQ
1.How can I place an order for SMBG51CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG51CA-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 SMBG51CA-M3/5B reliable?
The price and inventory of SMBG51CA-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 SMBG51CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBG51CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG51CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG51CA-M3/5B?
SMBG51CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG51CA-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 SMBG51CA-M3/5B?
For technical support, including SMBG51CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG51CA-M3/5B requirements.
6.How does Aetrix verify that SMBG51CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG51CA-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 SMBG51CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBG51CA-M3/5B?
All SMBG51CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG51CA-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 SMBG51CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBG51CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG51CA-M3/5B Tags
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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