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Vishay General Semiconductor - Diodes Division SMBG51A-M3/5B
- Part No.:
- SMBG51A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG51A-M3/5B.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,998
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Product details
Overview
SMBG51A-M3/5B 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 a 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 in automotive sensor signal lines, industrial I/O interfaces, and DC power rail protection.
For engineers reviewing the SMBG51A-M3/5B datasheet, SMBG51A-M3/5B pinout, SMBG51A-M3/5B application, or SMBG51A-M3/5B equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), 150 °C max junction temperature, and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM = 51 V and rapidly transitions to low-impedance conduction above VBR = 56.7–62.7 V to divert surge energy. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while the SMBG package delivers thermal resistance of RθJA = 100 °C/W and RθJL = 20 °C/W under defined pad layout.
The SMBG51A-M3/5B supports repetitive surge events at 0.01% duty cycle, withstands 100 A non-repetitive forward surge (8.3 ms half-sine), and meets J-STD-020 MSL Level 1 with 260 °C reflow peak. Its clamping performance (VC = 82.4 V @ IPPM = 7.3 A) provides predictable protection margin for 48 V nominal systems against ISO 7637-2 pulses and inductive switching transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before significant leakage; defines system working voltage ceiling. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on without premature conduction. |
| VC @ IPPM | 82.4 V at 7.3 A - Clamped voltage during 600 W surge; determines protected circuit's maximum transient exposure. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 μs waveform; validates immunity to common automotive/lightning surges. |
| IFSM | 100 A - Single half-sine surge rating (8.3 ms); supports high-energy inductive load switching events. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial environments. |
| Leakage ID | <1.0 μA at VWM - Low reverse leakage preserves signal integrity and minimizes standby power loss. |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, gull-wing lead form, matte tin-plated terminals solderable per J-STD-002/JESD 22-B102; polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected line or ground reference | Provides low-impedance path to ground during transient clamp; must be routed with minimal inductance. |
| Cathode | Current exit point in forward bias; marked with band on package body | Connected to higher-potential node (e.g., 48 V rail); defines unidirectional conduction direction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails. |
| Halogen-free & RoHS compliant (M3) | Meets environmental compliance requirements for industrial and automotive OEM supply chains. |
| 600 W peak pulse power (10/1000 μs) | Handles high-energy transients without degradation; suitable for ISO 7637-2 Pulse 1/2a/5a testing. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients; improves clamping precision. |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow assembly without moisture sensitivity concerns. |
Applications
| Automotive Sensor Protection | Industrial 24/48 V Power Rail |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive kickback in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between signal line and chassis ground. Use Value: Limits transient voltage to ≤82.4 V, preserving signal integrity and preventing damage to 5 V or 3.3 V interface ICs downstream. | Use Scenario: Safeguarding PLC I/O modules, motor drives, and programmable logic controllers against switching surges on 24 V or 48 V DC distribution buses. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input power rail, upstream of DC-DC converters and LDOs. Use Value: Absorbs up to 600 W surge energy without failure, maintaining system uptime during relay/contact bounce events. |
| Telecom Power Interface | Consumer Device DC Input |
Use Scenario: Shielding PoE-powered equipment (e.g., IP cameras, access points) from lightning-induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: First-line transient suppressor on primary DC input, coordinated with secondary MOV or GDT stages. Use Value: Fast response time and low clamping voltage reduce stress on downstream TVS arrays and protect Ethernet PHYs. | Use Scenario: Securing USB-C PD adapters, wall chargers, and portable electronics power inputs against ESD and accidental AC line transients. IC Role / Device Role / Timing Role: Unidirectional surge protector on DC input before primary filter capacitor and controller IC. Use Value: Halogen-free M3 construction supports global regulatory compliance; 150 °C rating accommodates enclosed thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBG51A-E3/5B | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3) | Preferred for industrial-grade non-automotive designs where halogen-free requirement is absent | Select when halogen-free material is not mandated and cost optimization is prioritized. |
| SMBG51AHM3/5B | Identical electrical specs; adds AEC-Q101 qualification (HM3 suffix denotes AEC-Q101 + halogen-free) | Required for automotive safety-critical subsystems (e.g., ADAS, powertrain) needing full qualification evidence | Choose when formal AEC-Q101 test reports and PPAP documentation are contractually required. |
Compared with SMBG51A-M3/5B, SMBG51A-E3/5B lacks halogen-free certification but offers identical surge performance, while SMBG51AHM3/5B adds verified AEC-Q101 qualification - enabling use in automotive functional safety domains where traceable qualification data is mandatory.
Availability
SMBG51A-M3/5B is available at Aetrix Electronics and suitable for automotive sensor protection, industrial 24/48 V power rail hardening, and telecom DC interface surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMBG51A-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, MOSFETs, and protection devices with emphasis on reliability, automotive qualification, and industrial robustness.
The SMBG series was engineered for high-power transient suppression in space-constrained SMT applications, targeting automotive, industrial, and telecom markets where AEC-Q101 compliance and repeatable clamping performance are critical.
FAQ
What is the clamping voltage of SMBG51A-M3/5B and how is it measured?
The SMBG51A-M3/5B 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's datasheet (Document Number: 88456, Rev. 09-Jan-2024) and reflects the voltage seen across the SMBG51A-M3/5B during standardized surge testing - critical for ensuring downstream ICs remain within safe operating limits.
Is SMBG51A-M3/5B suitable for automotive applications?
Yes, SMBG51A-M3/5B is halogen-free and RoHS compliant, but it is not AEC-Q101 qualified. For automotive use, select SMBG51AHM3/5B instead. The SMBG51A-M3/5B is rated for industrial-grade operation up to +150 °C and meets MSL Level 1, making it appropriate for non-safety-critical automotive subsystems where formal qualification is not mandated - always verify system-level compliance requirements before finalizing the SMBG51A-M3/5B design-in.
What does the "M3" suffix mean in SMBG51A-M3/5B?
The "M3" suffix in SMBG51A-M3/5B indicates halogen-free, RoHS-compliant construction meeting Vishay's industrial-grade reliability standards. It replaces lead-free solderability requirements and satisfies environmental regulations for global electronics manufacturing. This differs from "E3" (RoHS but not halogen-free) and "HM3" (AEC-Q101 qualified + halogen-free). The SMBG51A-M3/5B retains identical electrical performance to its E3 counterpart.
Can SMBG51A-M3/5B be used in bidirectional configurations?
No, SMBG51A-M3/5B is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and cathode band marking. Bidirectional operation requires the "CA" variant (e.g., SMBG51CA). Using SMBG51A-M3/5B in reverse-biased configurations risks permanent breakdown. Always confirm polarity alignment in PCB layout - the SMBG51A-M3/5B anode must connect toward the lower-potential node (typically ground).
What is the thermal resistance of SMBG51A-M3/5B and how does it affect layout?
SMBG51A-M3/5B 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. To maintain TJ ≤ 150 °C during repeated surges, PCB layout must provide adequate copper area and minimize trace inductance. Derating curves in the SMBG51A-M3/5B datasheet (Fig. 2) require thermal design validation at worst-case ambient temperatures and duty cycles.
SMBG51A-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:
- 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:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG51A-M3/5B FAQ
1.How can I place an order for SMBG51A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG51A-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 SMBG51A-M3/5B reliable?
The price and inventory of SMBG51A-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 SMBG51A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBG51A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG51A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG51A-M3/5B?
SMBG51A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG51A-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 SMBG51A-M3/5B?
For technical support, including SMBG51A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG51A-M3/5B requirements.
6.How does Aetrix verify that SMBG51A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG51A-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 SMBG51A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBG51A-M3/5B?
All SMBG51A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG51A-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 SMBG51A-M3/5B part is unused and in its original packaging.
Return procedure for SMBG51A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG51A-M3/5B Tags
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