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Vishay General Semiconductor - Diodes Division SMBG51-E3/5B
- Part No.:
- SMBG51-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG51-E3/5B.pdf
- Description:
- TVS DIODE 51VWM 91.1VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,716
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Product details
Overview
SMBG51-E3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-215AA (SMBG) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V standoff 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 - used to protect automotive sensor signal lines against inductive switching transients.
For engineers reviewing the SMBG51-E3/5B datasheet, SMBG51-E3/5B pinout, SMBG51-E3/5B application, or SMBG51-E3/5B equivalent, this page delivers verified electrical parameters, mechanical package details, real-world use cases in automotive and industrial systems, and validated alternative parts with documented functional differences.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging glass-passivated silicon junction technology for fast response (<1 ns) and low incremental surge resistance. Its thermal design supports operation from –55 °C to +150 °C junction temperature, with RθJA = 100 °C/W on standard 5.0 mm × 5.0 mm copper pads.
The SMBG51-E3/5B is rated for 100 A non-repetitive forward surge current (8.3 ms half-sine), exhibits ≤1.0 µA reverse leakage at VWM, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. It is RoHS-compliant (E3 suffix) and qualified to AEC-Q101 for automotive under-hood applications.
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 during transient events |
| VC @ IPPM | 82.4 V at 7.3 A - clamping voltage limits downstream IC stress during 600 W 10/1000 µs surge |
| PPPM | 600 W - peak pulse power handling capability defines transient energy absorption capacity |
| IFSM | 100 A - surge current rating validates survivability against automotive load-dump pulses |
| TJ max | +150 °C - enables deployment in high-temperature engine compartment environments |
| Leakage ID | ≤1.0 µA at 51 V - minimal standby power loss and signal integrity impact in always-on circuits |
Pinout & Package
Package: DO-215AA (SMBG), surface-mount, gull-wing leads, matte tin-plated terminals solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band on body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., sensor supply or signal trace); band marks this end |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against ISO 7637-2 Pulse 1/2a/5a transients without derating in standard PCB layouts |
| AEC-Q101 qualification | Validates reliability for automotive powertrain and chassis modules requiring extended temperature cycling and humidity exposure |
| Glass passivated junction | Ensures stable VBR and low leakage across 1000+ thermal cycles and 1000 hrs HTOL stress |
| MSL Level 1 (260 °C peak) | Supports single-reflow assembly without moisture sensitivity concerns or baking requirements |
| Low profile DO-215AA footprint | Reduces board space vs. SMA/SMB while maintaining 0.2" × 0.2" thermal pad compatibility for heat dissipation |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control units exposed to load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between sensor VOUT and ground, activated within <1 ns of overvoltage onset. Use Value: Limits transient voltage to ≤82.4 V, preventing damage to 3.3 V/5 V ADC inputs and ensuring ASIL-B functional safety compliance. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers subjected to field-wiring surges and relay contact bounce. IC Role / Device Role / Timing Role: Standoff protector on input front-end, conducting only during >51 V transients while remaining high-impedance during normal operation. Use Value: Maintains ≤1.0 µA leakage at 24 V, avoiding false triggering of optocoupler-based isolation stages. |
| Telecom Line Interface | Consumer Power Adapter ESD Clamp |
Use Scenario: Secondary-side transient suppression on 48 V PoE-powered Ethernet switch ports vulnerable to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-clamping unidirectional TVS on DC bias rail, coordinated with upstream GDT or MOV for staged protection. Use Value: Delivers 600 W surge handling without thermal runaway, validated per IEC 61000-4-5 Level 3 (1 kV/2 kV) |
Use Scenario: Input-stage ESD clamp on 12 V auxiliary rails of smart speaker power supplies exposed to human-body-model discharges. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) transient suppressor placed directly at connector entry point. Use Value: Clamps 8 kV HBM ESD events to <82.4 V within nanoseconds, preserving LDO regulator and USB controller integrity. |
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-E3/5B | Same DO-215AB (SMB) package but slightly larger body; identical VWM/VBR/VC specs and 600 W rating | Compatible with legacy SMB footprints; marginally higher RθJA (110 °C/W) due to smaller thermal pad area | Select when migrating from SMBJ-series designs or when tighter VBR tolerance (±5 % vs. ±10 %) is required |
| 1.5SMC51A | DO-214AB (SMC) package; same electrical specs but 1.5 kW peak power rating and higher IPPM (23.3 A) | Used where higher surge margin is needed (e.g., industrial motor drives); requires larger PCB area and different thermal layout | Choose for applications demanding >600 W headroom or where SMC's 150 °C TJ rating must be leveraged in convection-cooled enclosures |
Compared with SMBJ51A-E3/5B and 1.5SMC51A, the SMBG51-E3/5B offers optimal balance of AEC-Q101 qualification, compact DO-215AA footprint, and proven performance in automotive signal-line protection - making it preferred for space-constrained, high-reliability deployments where MSL Level 1 and whisker-tested leads are mandatory.
Availability
SMBG51-E3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom power rails, and consumer power adapter designs requiring stable component supply and long-term lifecycle support.
Supply support for SMBG51-E3/5B 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The SMBG series was engineered specifically for high-energy transient suppression in automotive and industrial environments, combining AEC-Q101 validation, low-profile packaging, and consistent clamping performance across temperature extremes.
FAQ
What is the standoff voltage rating of the SMBG51-E3/5B?
The SMBG51-E3/5B has a maximum reverse standoff voltage (VWM) of 51 V, meaning it remains non-conductive up to this DC or RMS voltage level under normal operating conditions. This value is critical for ensuring the device does not interfere with circuit functionality while providing reliable clamping above 51 V. The SMBG51-E3/5B maintains ≤1.0 µA leakage current at this voltage, supporting low-power sensor and interface applications.
Is the SMBG51-E3/5B suitable for automotive applications?
Yes, the SMBG51-E3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments with operating junction temperatures from –55 °C to +150 °C. Its glass-passivated junction, MSL Level 1 reflow compatibility, and JESD201 Class 1A whisker resistance make it appropriate for engine control units, ADAS sensor modules, and body electronics. The SMBG51-E3/5B meets ISO 7637-2 surge immunity requirements when applied per Vishay's recommended layout guidelines.
What is the clamping voltage of the SMBG51-E3/5B at its rated peak pulse current?
The SMBG51-E3/5B clamps to a maximum of 82.4 V at its specified peak pulse current (IPPM) of 7.3 A, measured using the standardized 10/1000 µs waveform. This clamping voltage defines the upper voltage limit imposed on protected circuitry during transient events and is essential for ensuring downstream components like microcontrollers or transceivers remain within their absolute maximum ratings. The SMBG51-E3/5B achieves this with low incremental surge resistance for minimal voltage overshoot.
Does the SMBG51-E3/5B have polarity marking, and how is it identified?
Yes, the SMBG51-E3/5B is a unidirectional TVS diode with polarity clearly marked by a cathode band on one end of the DO-215AA package body. This band identifies the cathode terminal, which must be connected toward the protected line (e.g., 51 V rail or signal trace), while the anode connects to ground or lower potential. No marking appears on bi-directional variants, but the SMBG51-E3/5B's band confirms its unidirectional function and correct orientation during automated placement.
What packaging option does SMBG51-E3/5B use, and what is its reel quantity?
The SMBG51-E3/5B is supplied in 13-inch diameter plastic tape and reel format with a base quantity of 3200 pieces per reel (package code "5B"). This packaging supports high-speed SMT assembly and complies with EIA-481 standards. The E3 suffix indicates RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD201 Class 1A whisker resistance requirements - all confirmed for the SMBG51-E3/5B delivery configuration.
SMBG51-E3/5B 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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 91.1V
- Current - Peak Pulse (10/1000µs):
- 6.6A
- 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 (SMBG)
SMBG51-E3/5B FAQ
1.How can I place an order for SMBG51-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG51-E3/5B 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 SMBG51-E3/5B reliable?
The price and inventory of SMBG51-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG51-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBG51-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG51-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG51-E3/5B?
SMBG51-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG51-E3/5B 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 SMBG51-E3/5B?
For technical support, including SMBG51-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG51-E3/5B requirements.
6.How does Aetrix verify that SMBG51-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG51-E3/5B 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 SMBG51-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBG51-E3/5B?
All SMBG51-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG51-E3/5B, 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 SMBG51-E3/5B part is unused and in its original packaging.
Return procedure for SMBG51-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG51-E3/5B Tags
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