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Vishay General Semiconductor - Diodes Division SMBJ20D-M3/H
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- Part No.:
- SMBJ20D-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20D-M3/H.pdf
- Description:
- TVS DIODE 20VWM 32VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,146
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Product details
Overview
SMBJ20D-M3/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, with 20 V stand-off voltage (VWM), 22.5–24.2 V breakdown voltage (VBR) at 1 mA, 32.0 V clamping voltage (VC) at 18.8 A peak pulse current, and 600 W peak pulse power rating per 10/1000 μs waveform. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD in industrial power supplies.
For engineers reviewing the SMBJ20D-M3/H datasheet, SMBJ20D-M3/H pinout, SMBJ20D-M3/H application, or SMBJ20D-M3/H equivalent, key selection criteria include unidirectional polarity, ±3.5 % VBR tolerance, 0.5 μA max reverse leakage at VWM, MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction for automated SMT assembly.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuit nodes, triggering conduction when transient voltage exceeds its breakdown threshold. Its low incremental surge resistance and fast response time ensure effective suppression of sub-microsecond transients without affecting normal DC operation.
Designed for unidirectional protection only, SMBJ20D-M3/H features a cathode band marking, requires no biasing, and maintains stable clamping performance across -55 °C to +150 °C junction temperature range. Thermal resistance is 125 °C/W (junction-to-ambient, mounted on minimum pad layout).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 22.5 V / 24.2 V at 1 mA - Tight ±3.5 % tolerance ensures predictable turn-on across production lots |
| VC @ IPPM | 32.0 V at 18.8 A - Clamped voltage during 600 W transient limits stress on downstream components |
| PPPM | 600 W (10/1000 μs) - Rated surge energy handling for repetitive transients at 0.01 % duty cycle |
| ID @ VWM | ≤ 0.5 μA - Negligible leakage preserves signal integrity and battery life in low-power circuits |
| TJ max | +150 °C - Enables reliable operation in high-temperature industrial environments |
| Package | SMB (DO-214AA) - Standardized SMT footprint compatible with JEDEC MS-012AC, supports automated placement |
Pinout & Package
Two-terminal unidirectional TVS diode in SMB (DO-214AA) package. Cathode marked by band; anode is unmarked end. Matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when V > VBR |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lowest potential reference point |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise overvoltage threshold setting without margin stacking in safety-critical designs |
| 600 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) with margin in compact SMB package |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without baking, simplifying SMT manufacturing |
| Halogen-free & RoHS | Meets industrial environmental compliance requirements without compromising surge robustness |
| Low 0.5 μA leakage | Prevents measurable DC loading on high-impedance sensor inputs or battery-backed circuits |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O pins from inductive kickback during relay or solenoid switching in PLC output stages. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between MOSFET gate and source, shunting transient energy before it reaches driver IC. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic interfaces while maintaining <1 ns response to 100 V/μs edges. | Use Scenario: Safeguarding LIN bus transceivers and sensor supply rails against load dump and jump-start transients in door module ECUs. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V rail upstream of LDO regulators, activated only during >20 V excursions. Use Value: Limits clamped voltage to 32.0 V, staying below absolute maximum ratings of automotive-grade regulators and transceivers. |
| Telecom Power Supplies | Consumer Appliance Control Boards |
Use Scenario: Input-stage surge protection on AC-DC adapter secondary side feeding isolated DC/DC converters in base station power modules. IC Role / Device Role / Timing Role: Primary transient clamp on +24 V distribution bus, coordinated with upstream MOVs and downstream ceramic filters. Use Value: Delivers 600 W pulse handling without thermal runaway, validated for repeated 10/1000 μs surges per IEC 61000-4-5. | Use Scenario: ESD and switching transient protection on touch panel interface lines and relay coil drivers in smart washing machine control boards. IC Role / Device Role / Timing Role: Point-of-use TVS on 5 V I²C lines and 24 V actuator outputs, placed within 2 mm of connector entry points. Use Value: Achieves <100 ps response with 32.0 V clamping, preventing false triggers and data corruption during 8 kV contact ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A-M3/H | Bidirectional variant; symmetric clamping in both polarities; same VWM/VBR/VC ratings | Required where AC-coupled or floating signal lines need protection against bipolar transients | Select SMBJ20A-M3/H only if bidirectional clamping is explicitly required; SMBJ20D-M3/H is optimal for DC-biased rails. |
| P6SMB20A | Same SMB package but ±5 % VBR tolerance (21–23.1 V); higher 1.0 μA ID at VWM | Acceptable for cost-sensitive consumer applications where tighter VBR control is not critical | Choose P6SMB20A only when ±5 % VBR tolerance and 1 μA leakage are acceptable; SMBJ20D-M3/H offers superior precision and leakage performance. |
Compared with SMBJ20A-M3/H and P6SMB20A, SMBJ20D-M3/H delivers tighter VBR tolerance (±3.5 % vs. ±5 %), lower leakage (0.5 μA vs. 1.0 μA), and guaranteed unidirectional operation-making it preferred for DC power rail and logic-level signal protection where polarity is fixed and precision matters.
Availability
SMBJ20D-M3/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMBJ20D-M3/H 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 reliability and ruggedized performance.
SMBJ20D-M3/H belongs to Vishay's TRANSZORB® family of surface-mount TVS diodes, engineered specifically for high-energy transient suppression in harsh industrial, automotive, and telecom environments.
FAQ
What is the clamping voltage of SMBJ20D-M3/H at its rated peak pulse current?
The SMBJ20D-M3/H has a maximum clamping voltage (VC) of 32.0 V at its rated peak pulse current (IPPM) of 18.8 A, measured under the standard 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated surge event and is critical for ensuring downstream components remain within their absolute maximum voltage ratings.
Is SMBJ20D-M3/H suitable for bidirectional transient protection?
No, SMBJ20D-M3/H is a unidirectional TVS diode, indicated by the "D" suffix and cathode band marking. For bidirectional protection, the SMBJ20A-M3/H (with "A" suffix and no polarity band) must be used. Using SMBJ20D-M3/H on AC or floating lines may result in unintended conduction or failure to suppress negative-going transients.
What is the maximum reverse leakage current for SMBJ20D-M3/H at its stand-off voltage?
The SMBJ20D-M3/H exhibits a maximum reverse leakage current (ID) of 0.5 μA at its 20 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage ensures minimal impact on high-impedance sensor circuits, battery-powered systems, and precision analog signal paths where even nanoamp-level currents could affect accuracy or runtime.
Does SMBJ20D-M3/H comply with lead-free and RoHS requirements?
Yes, SMBJ20D-M3/H carries the "M3" suffix, confirming it is halogen-free, RoHS-compliant, and qualified to JESD 201 Class 2 for tin whisker resistance. Its matte tin-plated terminals meet J-STD-002 solderability standards and support lead-free reflow profiles up to 260 °C peak temperature per J-STD-020 MSL Level 1.
What is the thermal resistance of SMBJ20D-M3/H when mounted on the minimum recommended PCB pad layout?
When mounted on the minimum recommended copper pad layout per Vishay specification, SMBJ20D-M3/H has a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W. This value is essential for calculating safe power derating above 25 °C ambient and confirms the device can dissipate 1.0 W continuously at room temperature under standard board conditions.
SMBJ20D-M3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.5V
- Voltage - Clamping (Max) @ Ipp:
- 32V
- Current - Peak Pulse (10/1000µs):
- 18.8A
- 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 (SMBJ)
SMBJ20D-M3/H FAQ
1.How can I place an order for SMBJ20D-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20D-M3/H 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 SMBJ20D-M3/H reliable?
The price and inventory of SMBJ20D-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20D-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ20D-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20D-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20D-M3/H?
SMBJ20D-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20D-M3/H 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 SMBJ20D-M3/H?
For technical support, including SMBJ20D-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20D-M3/H requirements.
6.How does Aetrix verify that SMBJ20D-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ20D-M3/H 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 SMBJ20D-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ20D-M3/H?
All SMBJ20D-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20D-M3/H, 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 SMBJ20D-M3/H part is unused and in its original packaging.
Return procedure for SMBJ20D-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20D-M3/H Tags
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