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Vishay General Semiconductor - Diodes Division SMBG20A-M3/5B
- Part No.:
- SMBG20A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG20A-M3/5B.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,906
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Product details
Overview
SMBG20A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power rails and signal lines. It features a 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V maximum clamping voltage (VC) at 18.5 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive power electronics, industrial sensor interfaces, and DC-DC converter input stages.
For engineers reviewing the SMBG20A-M3/5B datasheet, SMBG20A-M3/5B pinout, SMBG20A-M3/5B application, or SMBG20A-M3/5B equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free M3 suffix, DO-215AA (SMBG) package, unidirectional polarity with cathode band marking, and verified clamping performance under repetitive surge conditions per IEC 61000-4-5.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at 20 V), while the low incremental surge resistance enables rapid energy absorption without thermal runaway.
The device is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), supporting reliable operation on standard 5.0 mm × 5.0 mm copper pads. It meets J-STD-020 MSL Level 1 and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 22.2–24.5 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 32.4 V at 18.5 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; critical for IC survival. |
| PPPM (Peak Pulse Power) | 600 W - Sustained surge energy handling capability under standardized waveform; validates protection level per IEC 61000-4-5. |
| IPPM (Peak Pulse Current) | 18.5 A - Maximum non-repetitive surge current the device safely clamps without degradation. |
| TJmax | +150 °C - Enables use in under-hood automotive and high-temperature industrial environments without derating. |
| Package | SMBG (DO-215AA) - Low-profile surface-mount outline with gull-wing leads; optimized for automated placement and reflow compatibility. |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount gull-wing configuration with cathode band marking on one end. Matte tin-plated leads meet J-STD-002 solderability and JESD22-B102 reliability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path (unidirectional) | Connected to ground or low-impedance return node; completes clamping loop during overvoltage events. |
| Cathode | Reverse-biased terminal / Surge sink | Connected to protected line (e.g., 24 V rail); conducts avalanche current when VIN > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias HAST, and mechanical shock - suitable for engine control units and ADAS power supplies. |
| Halogen-free (M3 suffix) | Complies with IEC 61249-2-21 and RoHS Directive 2011/65/EU; eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating. |
| 600 W peak pulse power (10/1000 µs) | Provides proven protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges in 12 V/24 V systems. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during clamping - preserves margin for 3.3 V/5 V logic interfaces downstream of DC-DC converters. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs of body control modules (BCM) against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and DC-DC input capacitor. Use Value: Clamps 120 V/200 ms load dump spikes to ≤32.4 V, preventing damage to buck controller ICs and enabling compliance with ISO 16750-2. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in PLC I/O modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Point-of-entry TVS on 4–20 mA current loop output line, upstream of op-amp driver. Use Value: Limits induced transients to <33 V, preserving 24 V-rated op-amp input stage integrity and avoiding latch-up during 4 kV EFT bursts. |
| DC-DC Converter Input Stage | Telecom Line Card Surge Suppression |
Use Scenario: Input protection for isolated 24 V → 5 V flyback converters powering Ethernet PHYs in industrial gateways. IC Role / Device Role / Timing Role: Primary-side TVS across bulk capacitor input, coordinated with fuse and common-mode choke. Use Value: Absorbs 600 W surge energy within 1000 µs, maintaining <33 V stress on primary MOSFET and transformer insulation. |
Use Scenario: Secondary-side protection on -48 V telecom power feeds entering line cards in central office equipment. IC Role / Device Role / Timing Role: Unidirectional TVS on -48 V return path, referenced to chassis ground. Use Value: Withstands repeated 10/700 µs lightning surges up to 10 A while holding clamping voltage below -55 V, protecting PMICs and FPGAs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBG20A-E3/5B | Same electrical specs and SMBG package; uses standard RoHS-compliant (non-halogen-free) molding compound. | Approved for industrial but not automotive AEC-Q101 applications; lacks halogen-free certification. | Select when halogen-free requirement is absent and cost optimization is prioritized. |
| SMBG20AHM3/5B | Identical electrical specs and halogen-free construction; adds AEC-Q101 qualification and enhanced reliability screening. | Required for automotive safety-critical subsystems (e.g., ADAS, infotainment power rails) where qualification traceability is mandated. | Choose when full automotive qualification documentation and extended lifetime validation are needed. |
Compared with SMBG20A-M3/5B, SMBG20A-E3/5B offers identical protection performance at lower cost but excludes halogen-free compliance, while SMBG20AHM3/5B delivers the same environmental profile plus formal AEC-Q101 certification - making it the preferred choice for Tier 1 automotive BOMs requiring audit-ready qualification evidence.
Availability
SMBG20A-M3/5B is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom line card development requiring stable component supply, halogen-free compliance, and AEC-Q101 reliability assurance.
Supply support for SMBG20A-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 devices, and optoelectronics with emphasis on high-reliability, automotive-qualified components.
The SMBG TransZORB® series was engineered specifically for high-energy transient suppression in space-constrained, thermally demanding environments - targeting automotive, industrial, and telecom infrastructure applications where failure modes must be rigorously controlled.
FAQ
What is the maximum clamping voltage of the SMBG20A-M3/5B under a 10/1000 µs surge?
The SMBG20A-M3/5B has a maximum clamping voltage (VC) of 32.4 V at 18.5 A peak pulse current with a 10/1000 µs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMBG20A-M3/5B maintains this clamping performance across its full operating temperature range.
Is the SMBG20A-M3/5B suitable for automotive applications?
Yes, the SMBG20A-M3/5B is AEC-Q101 qualified and rated for operation from -55 °C to +150 °C, making it suitable for under-hood and chassis-mounted automotive applications including body control modules, lighting drivers, and ADAS power supplies. Its halogen-free (M3) construction and MSL Level 1 rating further support automotive manufacturing requirements. The SMBG20A-M3/5B meets all stress tests defined in the AEC-Q101 standard for transient voltage suppressors.
What does the "M3" suffix indicate in SMBG20A-M3/5B?
The "M3" suffix in SMBG20A-M3/5B denotes halogen-free, RoHS-compliant construction meeting IEC 61249-2-21 requirements, with UL 94 V-0 flammability rating. It distinguishes this variant from the "E3" (standard RoHS) and "HM3" (AEC-Q101 + halogen-free) versions. The SMBG20A-M3/5B retains full electrical equivalence with E3 variants while satisfying stricter environmental mandates in industrial and consumer electronics.
How is polarity identified on the SMBG20A-M3/5B package?
The SMBG20A-M3/5B is a unidirectional TVS diode with polarity marked by a cathode band on the package body - located at the end corresponding to the cathode terminal. During PCB layout, the cathode must connect to the line being protected (e.g., 24 V rail), and the anode to ground or return path. This orientation ensures proper avalanche conduction during positive-going transients. The SMBG20A-M3/5B does not function correctly if installed in reverse.
What is the thermal resistance specification for the SMBG20A-M3/5B?
The SMBG20A-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W, measured on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. These values enable accurate thermal modeling in high-power surge scenarios and confirm suitability for reflow soldering at 260 °C peak temperature. The SMBG20A-M3/5B's thermal performance supports sustained operation in enclosed industrial enclosures without forced airflow.
SMBG20A-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 18.5A
- 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)
SMBG20A-M3/5B FAQ
1.How can I place an order for SMBG20A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG20A-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 SMBG20A-M3/5B reliable?
The price and inventory of SMBG20A-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 SMBG20A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBG20A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG20A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG20A-M3/5B?
SMBG20A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG20A-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 SMBG20A-M3/5B?
For technical support, including SMBG20A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG20A-M3/5B requirements.
6.How does Aetrix verify that SMBG20A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG20A-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 SMBG20A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBG20A-M3/5B?
All SMBG20A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG20A-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 SMBG20A-M3/5B part is unused and in its original packaging.
Return procedure for SMBG20A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG20A-M3/5B Tags
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