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Vishay General Semiconductor - Diodes Division SMBG51A-M3/52
- Part No.:
- SMBG51A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG51A-M3/52.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,318
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Product details
Overview
SMBG51A-M3/52 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. 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 ECUs, industrial I/O modules, and DC power rail protection.
For engineers reviewing the SMBG51A-M3/52 datasheet, SMBG51A-M3/52 pinout, SMBG51A-M3/52 application, or SMBG51A-M3/52 equivalent, key selection criteria include unidirectional polarity, DO-215AA (SMBG) package compatibility, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), and clamping performance under repetitive surge conditions.
Technical Context
This TVS diode operates as a shunt-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 transient energy. Its glass-passivated junction ensures stable leakage (<1 µA at VWM) and fast response time (<1 ns), critical for protecting sensitive MOSFET gates and microcontroller I/O pins.
The SMBG51A-M3/52 is rated for TJ = –55 °C to +150 °C operation, supports 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak - enabling use in high-reliability surface-mount assemblies without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - guaranteed breakdown threshold defining turn-on consistency |
| 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 - single half-sine surge current rating (8.3 ms), supporting inrush and load-dump events |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMBG (DO-215AA) - surface-mount outline with 0.235–0.255" body length, optimized for automated placement |
Pinout & Package
Package: SMBG (DO-215AA) - molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, 0.030" ±0.015" lead thickness, and cathode band marking for polarity identification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected line ground or low-side reference | Completes conduction path during transient clamping; must be routed with low-inductance trace to minimize overshoot |
| Cathode | Current exit terminal in forward bias; marked by band on package body | Connected to protected circuit node (e.g., MCU VDD rail); defines clamping reference point |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Halogen-free & RoHS compliant (M3 suffix) | Meets environmental compliance requirements for industrial and consumer end equipment without compromising surge robustness |
| 600 W peak pulse power (10/1000 µs) | Handles ISO 7637-2 Pulse 1/2a/5a transients and IEC 61000-4-5 surges without degradation |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1 µA) across temperature and lifetime |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without pre-baking or special handling |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load dump and alternator ripple transients on 12 V battery-fed ECUs and lighting modules. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between power rail and chassis ground to clamp spikes up to 120 V. Use Value: Limits voltage seen by downstream LDOs and MCUs to ≤82.4 V, preventing latch-up or gate oxide damage. | Use Scenario: Protecting analog front-end inputs of pressure/temperature sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Fast-response transient suppressor on signal lines (e.g., 4–20 mA loop, CAN stubs) referenced to local ground. Use Value: Clamps 8 kV HBM ESD pulses within <1 ns while maintaining <1 µA leakage at 51 V, preserving signal integrity. |
| DC-DC Converter Input Protection | Telecom Line Card Surge Suppression |
Use Scenario: Guarding buck converter inputs against induced switching noise and inductive kickback from adjacent relays or solenoids. IC Role / Device Role / Timing Role: Unidirectional TVS placed upstream of input filter capacitor to absorb 600 W surges without thermal runaway. Use Value: Withstands 100 A IFSM and maintains RθJL = 20 °C/W, enabling reliable operation without heatsinking. | Use Scenario: Safeguarding Ethernet PHY or PoE controller inputs against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level protector on RJ45 interface side, coordinated with GDT or polymer PTC secondary protection. Use Value: Provides precise 51 V VWM hold-off for 48 V PoE systems while clamping to 82.4 V to protect 5 V tolerant PHYs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBG51A-E3/52 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3) | Preferred for industrial-grade boards where halogen content is unrestricted | Select when halogen-free requirement is absent and cost optimization is prioritized |
| SMBG51AHM3/52 | Identical specs plus AEC-Q101 qualification (HM3 suffix denotes AEC-Q101 + halogen-free) | Required for automotive OEM designs needing full qualification evidence | Choose for Tier 1 automotive programs requiring documented AEC-Q101 test reports |
Compared with SMBG51A-M3/52, the E3 variant offers identical surge performance without halogen-free assurance, while the HM3 variant adds formal AEC-Q101 validation - making SMBG51A-M3/52 the optimal balance of automotive readiness, environmental compliance, and cost for Tier 2 suppliers and industrial designers.
Availability
SMBG51A-M3/52 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor nodes, and telecom power supply designs requiring stable component supply, halogen-free compliance, and AEC-Q101-aligned reliability.
Supply support for SMBG51A-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, MOSFETs, and protection devices with emphasis on high-reliability, automotive-qualified components.
The SMBG series was engineered for surface-mount transient suppression in space-constrained, high-surge environments - delivering 600 W pulse capability in the compact DO-215AA footprint while meeting automotive and industrial qualification standards.
FAQ
What is the clamping voltage of SMBG51A-M3/52 under standard test conditions?
The SMBG51A-M3/52 has a maximum clamping voltage (VC) of 82.4 V at 7.3 A peak pulse current (IPPM) using a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable voltage limiting during transient events. The SMBG51A-M3/52 maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMBG51A-M3/52 suitable for automotive applications?
Yes, SMBG51A-M3/52 is AEC-Q101 qualified and rated for junction temperatures up to +150 °C, making it suitable for under-hood and chassis-mounted automotive systems. Its glass-passivated junction, MSL Level 1 reflow rating, and 100 A IFSM support robust operation in engine control units, body controllers, and ADAS sensor modules. The SMBG51A-M3/52 meets automotive surge immunity requirements including ISO 7637-2.
How does the M3 suffix differ from E3 in SMBG51A-M3/52?
The M3 suffix indicates halogen-free, RoHS-compliant construction, whereas E3 is RoHS-compliant but contains halogens. Both share identical electrical specifications, thermal resistance (RθJA = 100 °C/W), and mechanical dimensions. The SMBG51A-M3/52 satisfies stricter environmental mandates such as JEDEC JESD201 Class 2 whisker resistance and EU RoHS Annex II halogen restrictions.
What is the reverse leakage current of SMBG51A-M3/52 at rated stand-off voltage?
At VWM = 51 V and TA = 25 °C, the SMBG51A-M3/52 exhibits a maximum reverse leakage current (ID) of 1 µA. This low leakage preserves power efficiency in always-on circuits and prevents false triggering in high-impedance sensor interfaces. The SMBG51A-M3/52 maintains leakage <5 µA up to +125 °C per derating curves in the Vishay datasheet.
Can SMBG51A-M3/52 be used in bidirectional configurations?
No - SMBG51A-M3/52 is a unidirectional TVS diode, identified by the "A" suffix and cathode band marking. For bidirectional operation, Vishay specifies the "CA" suffix (e.g., SMBG51CA). Using SMBG51A-M3/52 in reverse-biased configurations risks permanent breakdown. Always verify polarity alignment during PCB layout; the SMBG51A-M3/52 must be oriented with cathode toward the protected voltage rail.
SMBG51A-M3/52 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:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG51A-M3/52 FAQ
1.How can I place an order for SMBG51A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG51A-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 SMBG51A-M3/52 reliable?
The price and inventory of SMBG51A-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 SMBG51A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBG51A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG51A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG51A-M3/52?
SMBG51A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG51A-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 SMBG51A-M3/52?
For technical support, including SMBG51A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG51A-M3/52 requirements.
6.How does Aetrix verify that SMBG51A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG51A-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 SMBG51A-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBG51A-M3/52?
All SMBG51A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG51A-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 SMBG51A-M3/52 part is unused and in its original packaging.
Return procedure for SMBG51A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG51A-M3/52 Tags
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