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Vishay General Semiconductor - Diodes Division SMBG51A-E3/52
- Part No.:
- SMBG51A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG51A-E3/52.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,989
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Product details
Overview
SMBG51A-E3/52 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of sensitive electronics. It features 51 V stand-off voltage (VWM), 56.7–62.7 V breakdown voltage (VBR at 1 mA), 82.4 V maximum clamping voltage (VC) at 7.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed on automotive sensor signal lines, industrial I/O ports, and DC power rails.
For engineers reviewing the SMBG51A-E3/52 datasheet, SMBG51A-E3/52 pinout, SMBG51A-E3/52 application, or SMBG51A-E3/52 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (–55 to +150 °C), and RoHS-compliant industrial-grade packaging details.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 51 V), then rapidly switches to low-impedance conduction when transients exceed VBR, clamping the protected line to ≤82.4 V. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns), while the SMBG package supports automated SMT placement and meets MSL Level 1 (260 °C reflow).
The device is rated for 100 A non-repetitive forward surge current (8.3 ms half-sine), has typical junction-to-lead thermal resistance of 20 °C/W, and is qualified per AEC-Q101 for automotive under-hood and chassis applications - enabling use in environments with wide thermal cycling and mechanical vibration.
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 - precise breakdown threshold defining turn-on sensitivity |
| VC @ IPPM | 82.4 V at 7.3 A - clamped voltage during 600 W transient, limiting stress on downstream ICs |
| PPPM | 600 W - peak pulse power handling with 10/1000 μs waveform, duty cycle ≤0.01 % |
| IFSM | 100 A - surge current tolerance for 8.3 ms half-sine, critical for inductive load switching events |
| TJ range | –55 °C to +150 °C - full operational range supporting automotive and industrial ambient extremes |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 5 mm × 5 mm copper pads |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, low-profile gull-wing leadframe with matte tin-plated terminals solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during clamping | Connected to protected line (e.g., signal or supply rail); must be routed with low-inductance path to ground |
| Cathode | Current exit point during clamping | Connected to system ground; band-marked end; defines directionality and clamping polarity |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood and chassis applications including engine control, ADAS sensors, and body electronics |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift |
| 600 W peak pulse power | Handles ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surge events without degradation |
| MSL Level 1 rating | Supports standard 260 °C Pb-free reflow without preconditioning or baking |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD or inductive kick) |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between signal line and chassis ground, absorbing energy before it reaches the transceiver input. Use Value: Limits transient voltage to ≤82.4 V, preventing latch-up or gate oxide damage in 5 V/12 V interface ICs while maintaining signal integrity. | Use Scenario: Safeguarding PLC digital input modules against field-wiring surges and relay contact bounce. IC Role / Device Role / Timing Role: Front-end protection element on 24 V DC input channels, placed upstream of optocoupler or Schmitt trigger input stage. Use Value: Withstands repeated 600 W pulses without parametric shift, ensuring long-term reliability in factory automation environments. |
| DC Power Rail Protection | Consumer Device USB Port Protection |
Use Scenario: Clamping 12 V/24 V supply rails in telematics units and infotainment head units against ISO 16750-2 load dump. IC Role / Device Role / Timing Role: Parallel-connected TVS across input capacitor, conducting fault current to ground during >51 V excursions. Use Value: 100 A IFSM rating enables survival of 8.3 ms load dump events, preserving downstream PMICs and microcontrollers. | Use Scenario: Secondary-level surge suppression on VBUS lines of USB-C ports in portable medical monitors and smart home hubs. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after primary fuse and upstream of USB PD controller, providing final-stage clamping. Use Value: 51 V VWM avoids interference with 20 V PD negotiation while clamping lightning-induced surges to safe levels. |
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 VWM/VBR/VC specs but in SMB (DO-214AA) package; RθJA = 110 °C/W vs. 100 °C/W | Lower power density; less suitable for high-ambient automotive under-hood locations | Select SMBG51A-E3/52 when board space allows and thermal performance is critical; choose SMBJ51A-E3/52 for legacy SMB footprint compatibility. |
| SMCJ51A-E3/52 | Same electrical specs but in larger SMC (DO-214AB) package; higher IPPM (12.3 A) and PPPM (1500 W) | Overqualified for 600 W needs; occupies ~2.5× PCB area; better for high-energy industrial surges | Choose SMBG51A-E3/52 for cost-optimized, space-constrained designs meeting 600 W requirements; use SMCJ51A-E3/52 only if future-proofing for higher surge standards is required. |
Compared with SMBJ51A-E3/52 and SMCJ51A-E3/52, SMBG51A-E3/52 delivers optimal thermal performance (RθJA = 100 °C/W) in a compact SMBG outline, making it preferred for AEC-Q101-compliant automotive modules where both size and thermal margin are constrained.
Availability
SMBG51A-E3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial programmable logic controllers, and DC power distribution systems requiring stable component supply, AEC-Q101 validation, and RoHS-compliant manufacturing traceability.
Supply support for SMBG51A-E3/52 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, automotive qualification, and high-volume manufacturability.
The SMBG series is engineered specifically for surface-mount transient suppression in harsh-environment applications - balancing compact size, AEC-Q101 compliance, and repeatable clamping performance across temperature and lifetime.
FAQ
What is the clamping voltage of SMBG51A-E3/52 and how is it measured?
The SMBG51A-E3/52 has a maximum clamping voltage (VC) of 82.4 V, measured at 7.3 A peak pulse current using a 10/1000 μs waveform per IEC 61000-4-5. This value reflects the actual voltage seen by protected circuitry during a standardized surge event and is guaranteed across the full operating temperature range of –55 °C to +150 °C. The SMBG51A-E3/52 achieves this with low incremental surge resistance and fast junction response.
Is SMBG51A-E3/52 qualified for automotive applications?
Yes, SMBG51A-E3/52 is AEC-Q101 qualified, meaning it has passed stress tests for temperature cycling, humidity, mechanical shock, and high-temperature operating life required for automotive electronic components. It is rated for junction temperatures up to +150 °C and meets MSL Level 1 for lead-free reflow - making it suitable for engine control units, ADAS camera modules, and body control modules. The SMBG51A-E3/52 carries the HE3 suffix variant for explicit AEC-Q101 certification.
What does the "E3/52" suffix mean in SMBG51A-E3/52?
The "E3" suffix indicates RoHS-compliant, industrial-grade construction with matte tin-plated leads; "52" denotes the preferred packaging code - 750-unit quantity on 7-inch plastic tape-and-reel. This configuration supports automated pick-and-place assembly and complies with J-STD-002 solderability standards. The SMBG51A-E3/52 is distinct from HE3 (AEC-Q101 qualified) and M3 (halogen-free) variants, though all share identical electrical characteristics.
How does SMBG51A-E3/52 compare to bidirectional TVS diodes like SMBG51CA?
SMBG51A-E3/52 is unidirectional and intended for DC line protection where polarity is fixed (e.g., 12 V supply rails), while SMBG51CA is bidirectional and used on AC or floating signal lines (e.g., RS-485, audio). The SMBG51A-E3/52 has a cathode band marking and conducts only in reverse bias above VBR; SMBG51CA has no polarity marking and clamps symmetrically in both directions. Their VBR and VC values differ slightly due to internal structure - SMBG51A-E3/52 is not interchangeable with SMBG51CA without circuit review.
What is the thermal resistance of SMBG51A-E3/52 and why does it matter?
The SMBG51A-E3/52 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 determines how much the junction temperature rises under sustained power dissipation - critical for reliability during repetitive surge events or elevated ambient conditions. Lower RθJA than SMBJ variants makes SMBG51A-E3/52 more thermally robust in compact, high-density layouts. Designers must verify layout adherence to the recommended pad dimensions to achieve this rating.
SMBG51A-E3/52 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:
- 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 (SMBG)
SMBG51A-E3/52 FAQ
1.How can I place an order for SMBG51A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG51A-E3/52 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 SMBG51A-E3/52 reliable?
The price and inventory of SMBG51A-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG51A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBG51A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG51A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG51A-E3/52?
SMBG51A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG51A-E3/52 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 SMBG51A-E3/52?
For technical support, including SMBG51A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG51A-E3/52 requirements.
6.How does Aetrix verify that SMBG51A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG51A-E3/52 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 SMBG51A-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBG51A-E3/52?
All SMBG51A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG51A-E3/52, 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 SMBG51A-E3/52 part is unused and in its original packaging.
Return procedure for SMBG51A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG51A-E3/52 Tags
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