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Vishay General Semiconductor - Diodes Division SMBJ20D-M3/I
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- Part No.:
- SMBJ20D-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20D-M3/I.pdf
- Description:
- TVS DIODE 20VWM 32VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,286
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Product details
Overview
SMBJ20D-M3/I 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 (10/1000 μs). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD in industrial and telecom power rails.
For engineers reviewing the SMBJ20D-M3/I datasheet, SMBJ20D-M3/I pinout, SMBJ20D-M3/I application, or SMBJ20D-M3/I equivalent, this page delivers verified electrical parameters, polarity marking, thermal derating behavior, M3-grade halogen-free RoHS compliance, and bidirectional alternative options for surge protection design validation.
Technical Context
The SMBJ20D-M3/I operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 22.5–24.2 V breakdown threshold. Its low 32.0 V clamping voltage at 18.8 A ensures downstream components remain below safe operating limits during 600 W transient events.
Designed for surface-mount assembly on standard PCB pads, it meets J-STD-020 MSL Level 1 (peak reflow 260 °C), features matte tin-plated leads, and complies with JESD201 Class 2 whisker resistance. Polarity is indicated by a cathode band on the device body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 22.5 V / 24.2 V at 1 mA - precise avalanche onset range enabling tight circuit margin control |
| VC @ IPPM | 32.0 V at 18.8 A - clamped voltage during full 600 W transient, limiting stress on protected ICs |
| PPPM | 600 W (10/1000 μs waveform) - standardized surge energy handling per IEC 61000-4-5 |
| ID @ VWM | ≤ 0.5 μA - negligible leakage at rated stand-off, critical for low-power sensor interfaces |
| TJ max | +150 °C - enables operation in high-temperature industrial environments without derating |
| RθJA | 125 °C/W (min pad layout) - defines thermal rise under steady-state dissipation (1.0 W at 25 °C) |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, M3-grade (JESD201 Class 2 whisker resistant), cathode-indicated by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential side (e.g., ground or return path) in unidirectional clamp configuration |
| Cathode | Banded end | Connected to protected line (e.g., 20 V rail); conducts during overvoltage to shunt surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables predictable clamping across production lots, reducing safety margin overhead in 20 V rail designs |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-to-line) without degradation when properly mounted |
| Low 0.5 μA leakage at 20 V | Preserves signal integrity and battery life in always-on sensor nodes and low-power microcontrollers |
| MSL Level 1 rating | Allows single-pass reflow without baking, supporting high-yield automated SMT assembly |
| M3 suffix compliance | Guarantees long-term reliability in vibration-prone industrial equipment via JESD201 Class 2 tin whisker mitigation |
Applications
| Industrial Motor Control | Telecom Power Supply |
|---|---|
Use Scenario: Protection of gate drivers and MCU I/O against flyback spikes from 24 V DC solenoid switching. IC Role / Device Role / Timing Role: Unidirectional TVS placed between MOSFET gate and source, clamping negative transients to <32 V. Use Value: Prevents gate oxide rupture in logic-level MOSFETs while maintaining <0.5 μA standby leakage. | Use Scenario: Input rail protection on 24 V/48 V telecom rectifier modules exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge clamp on DC input bus, coordinated with upstream MOVs and downstream LC filters. Use Value: Limits transient overshoot to ≤32 V during 600 W 10/1000 μs events, preserving DC-DC converter ICs. |
| Automotive Body Control Module | Industrial Sensor Interface |
Use Scenario: Reverse battery and load dump protection on LIN bus power inputs in BCM subassemblies. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to chassis ground, absorbing 12 V system transients up to 32 V. Use Value: Survives ISO 7637-2 Pulse 1 (−150 V/50 ms) and Pulse 3b (−100 V/100 ns) when combined with series impedance. | Use Scenario: ESD and cable discharge protection on 20 V analog sensor supply lines (e.g., pressure transducers). IC Role / Device Role / Timing Role: Local TVS at connector entry point, shunting fast transients before reaching precision ADC reference rails. Use Value: Maintains <0.5 μA leakage to avoid offset drift in 24-bit sigma-delta ADC front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-M3/I | Bidirectional variant; symmetric VBR (22.5–24.2 V) and VC (32.0 V) in both polarities; no cathode band | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus) where reverse transients occur | Select SMBJ20CA-M3/I only when protecting balanced differential pairs or floating rails needing bidirectional clamping |
| P6SMB20AHE3/A | Same SMB package, 20 V VWM, but ±5 % VBR tolerance (21–23.1 V); higher ID (1.0 μA); non-M3 finish | Acceptable for cost-sensitive consumer applications where tighter leakage and whisker resistance are non-critical | Choose P6SMB20AHE3/A only if M3 qualification and sub-0.5 μA leakage are not required for the target environment |
Compared with SMBJ20CA-M3/I, the SMBJ20D-M3/I provides directional clamping essential for DC power rails, while P6SMB20AHE3/A trades precision and reliability for lower cost-making SMBJ20D-M3/I optimal for industrial-grade 20 V rail protection where leakage, thermal robustness, and long-term whisker immunity are mandatory.
Availability
SMBJ20D-M3/I is available at Aetrix Electronics and suitable for industrial motor control, telecom power supply, and automotive body control module designs requiring stable component supply, M3-grade reliability, and consistent 20 V clamping performance.
Supply support for SMBJ20D-M3/I 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 ruggedness and reliability.
The SMBJ series was engineered for high-energy transient suppression in harsh environments, targeting industrial automation, telecom infrastructure, and automotive subsystems where repeatable clamping and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ20D-M3/I and how is it measured?
The SMBJ20D-M3/I has a maximum clamping voltage (VC) of 32.0 V, measured at its peak pulse current (IPPM) of 18.8 A using a standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed per Vishay's datasheet (Doc. #87606, Rev. 09-Jan-2024) and reflects the actual voltage seen by downstream components during worst-case transient events. The SMBJ20D-M3/I maintains this clamping performance across its full operating temperature range.
Does SMBJ20D-M3/I meet RoHS and halogen-free requirements?
Yes, SMBJ20D-M3/I is halogen-free and RoHS-compliant, as confirmed by the "Base P/N-M3" designation in Vishay's datasheet. The M3 suffix indicates compliance with JESD201 Class 2 whisker resistance, UL 94 V-0 flammability rating for the molding compound, and full adherence to EU RoHS Directive 2011/65/EU. Traceability documentation for SMBJ20D-M3/I is available upon request from Aetrix Electronics.
What is the thermal resistance of SMBJ20D-M3/I and how does it affect power handling?
The SMBJ20D-M3/I has a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W when mounted on the minimum recommended pad layout. This means a 1.0 W steady-state power dissipation at 25 °C ambient raises junction temperature by 125 °C-limiting continuous use to derated conditions. For transient events, the device relies on short-duration thermal mass, not steady-state cooling; its 600 W PPPM rating remains valid regardless of RθJA due to the 1000 μs pulse width.
How is polarity identified on SMBJ20D-M3/I and why does it matter?
Polarity on SMBJ20D-M3/I is marked by a cathode band on the banded end of the SMB (DO-214AA) package. This identifies the terminal that must be connected to the protected line (e.g., +20 V rail), while the anode connects to ground or return. Correct orientation is essential: reverse installation renders the device ineffective for unidirectional surge suppression, as conduction only occurs when cathode voltage exceeds anode by ≥22.5 V.
Can SMBJ20D-M3/I replace SMBJ20A or SMBJ20CA in existing designs?
No-SMBJ20D-M3/I is not a drop-in replacement for SMBJ20A (older revision, non-M3) or SMBJ20CA-M3/I (bidirectional). While all share the same VWM and package, SMBJ20D-M3/I offers tighter VBR tolerance (±3.5 % vs. ±5 %), lower leakage (≤0.5 μA vs. ≤1.0 μA), and M3 whisker resistance. Substituting requires validation of thermal, leakage, and reliability margins; SMBJ20CA-M3/I must only be used where bidirectional clamping is functionally required.
SMBJ20D-M3/I 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/I FAQ
1.How can I place an order for SMBJ20D-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20D-M3/I 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/I reliable?
The price and inventory of SMBJ20D-M3/I 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/I is usually 5 days.
3.What payment methods are accepted for SMBJ20D-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20D-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20D-M3/I?
SMBJ20D-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20D-M3/I 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/I?
For technical support, including SMBJ20D-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20D-M3/I requirements.
6.How does Aetrix verify that SMBJ20D-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ20D-M3/I 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/I meets industry standards.
7.What is the process for return or replacement of SMBJ20D-M3/I?
All SMBJ20D-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20D-M3/I, 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/I part is unused and in its original packaging.
Return procedure for SMBJ20D-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20D-M3/I Tags
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