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Vishay General Semiconductor - Diodes Division SMBJ20A-M3/5B
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- Part No.:
- SMBJ20A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20A-M3/5B.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,611
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Product details
Overview
SMBJ20A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC 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 industrial motor drives, automotive body control modules, and industrial sensor interfaces.
For engineers reviewing the SMBJ20A-M3/5B datasheet, SMBJ20A-M3/5B pinout, SMBJ20A-M3/5B application, or SMBJ20A-M3/5B equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, and halogen-free RoHS-compliant sourcing status per Vishay's M3 suffix specification.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 20 V, it avalanches to limit transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the 100 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design per Vishay's 0.2" × 0.2" (5.0 mm × 5.0 mm) recommendation.
The device sustains 100 A non-repetitive forward surge current (IFSM) and exhibits a +0.094 %/°C temperature coefficient of VBR, enabling predictable clamping shift across –55 °C to +150 °C operating range. Its 20 ns response time and low incremental surge resistance ensure effective suppression of ESD, lightning-induced transients, and inductive switching spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 22.2–24.5 V at IT = 1 mA - Confirmed avalanche onset range; ensures reliable triggering above normal rail voltage. |
| VC (Clamping Voltage) | 32.4 V at IPPM = 18.5 A - Peak voltage seen by protected circuit during 600 W transient; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 600 W with 10/1000 µs waveform - Energy-handling capacity for standardized surge events; validated per ANSI/IEEE C62.35. |
| IPPM (Peak Pulse Current) | 18.5 A - Maximum transient current diverted during clamping; directly derived from VC and PPPM. |
| TJmax | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and high-temperature industrial enclosures. |
| Package | SMB (DO-214AA) - Surface-mount outline with cathode band marking; compatible with automated placement and reflow soldering (MSL Level 1, 260 °C peak). |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional types. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; grounded or connected to low-impedance return path in TVS configuration. | Provides reference node for clamping action; must be routed with minimal inductance to maintain fast response. |
| Cathode | Current exit point in forward bias; connected to protected line (e.g., 20 V rail or signal trace). | Defines polarity-sensitive connection - reverse-biased during overvoltage event to initiate avalanche conduction. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without derating in standard PCB layouts. |
| 32.4 V clamping at 18.5 A | Keeps protected 24 V systems within safe operating area of downstream MOSFETs and microcontrollers during transients. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and automotive ELV directive for sustainable manufacturing. |
| 100 A IFSM (8.3 ms half-sine) | Supports robustness against accidental DC overcurrent events such as load dump in 12 V/24 V vehicle subsystems. |
| Low leakage (<1.0 µA at VWM) | Minimizes standby power loss in battery-powered sensors and ensures no measurable voltage drop on 20 V supply rails. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 24 V DC bus against inductive kickback from relay coils and solenoid drivers. IC Role / Device Role / Timing Role: Shunt TVS diode placed across power input terminals to clamp transients before they reach gate drivers and MCU power supplies. Use Value: Limits voltage excursions to ≤32.4 V during 18.5 A surges, preventing latch-up or oxide breakdown in 36 V-rated power management ICs. |
Use Scenario: Safeguarding LIN bus transceivers and LED driver ICs from load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN line and ground to suppress negative-going spikes and positive overshoots up to 32.4 V. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 5a (load dump) by clamping within 20 ns, avoiding communication errors or reset events. |
| Industrial Sensor Interfaces | Telecom Power Supply Inputs |
|
Use Scenario: Shielding 4–20 mA current loop receivers and analog front-end amplifiers from ESD and field wiring transients. IC Role / Device Role / Timing Role: TVS placed at connector entry point to absorb ±8 kV contact ESD (IEC 61000-4-2) and divert energy away from precision op-amps. Use Value: Achieves <100 ns total clamping delay, ensuring amplifier input stages remain below absolute maximum ratings during fast transients. |
Use Scenario: Input-stage surge protection for 24 V telecom rectifier modules exposed to lightning-induced surges on AC mains feeders. IC Role / Device Role / Timing Role: Primary shunt protector on DC output side of AC/DC converter, coordinated with upstream MOVs and fuses. Use Value: Handles 600 W pulses without degradation, supporting multi-level protection architecture compliant with GR-1089-CORE Section 4.5.2.2. |
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-E3/5B | Same electrical specs and SMB package; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Approved for commercial-grade industrial equipment where halogen content is unrestricted. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 qualification is not needed. |
| SMBJ20AHM3_B/I | Identical electrical and thermal specs; HM3 suffix denotes halogen-free + AEC-Q101 qualification; "B/I" indicates 13" reel packaging. | Qualified for automotive under-hood use per AEC-Q101; required for OEM Tier 1 BOMs in body electronics. | Choose for automotive production programs requiring full PPAP documentation and extended temperature validation. |
Compared with SMBJ20A-M3/5B, the E3/5B variant offers lower cost for non-automotive applications, while the HM3_B/I version adds AEC-Q101 qualification and automotive traceability - neither is pin-compatible with bidirectional variants like SMBJ20CA, and all require identical SMB footprint layout.
Availability
SMBJ20A-M3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supply inputs requiring stable component supply, halogen-free compliance, and repeatable surge performance across production batches.
Supply support for SMBJ20A-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 reliability, power efficiency, and application-specific ruggedization.
The SMBJ series was engineered for high-energy transient suppression in space-constrained surface-mount designs, targeting automotive, industrial, and telecom systems where consistent clamping voltage and long-term stability under thermal cycling are critical.
FAQ
What is the maximum clamping voltage of SMBJ20A-M3/5B at its rated peak pulse current?
The SMBJ20A-M3/5B has a maximum clamping voltage (VC) of 32.4 V at its rated peak pulse current (IPPM) of 18.5 A, measured under the standardized 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuits during transient events and is confirmed in Vishay's datasheet Document Number 88392, page 2. The SMBJ20A-M3/5B maintains this clamping performance across its full operating temperature range.
Is SMBJ20A-M3/5B suitable for automotive applications requiring AEC-Q101 qualification?
No, SMBJ20A-M3/5B is halogen-free and RoHS-compliant but not AEC-Q101 qualified. For automotive use, select SMBJ20AHM3_B/I or SMBJ20AHE3_B/I - both carry the HE3 or HM3 suffix and explicit AEC-Q101 qualification noted in Vishay's ordering table. The SMBJ20A-M3/5B remains appropriate for commercial and industrial applications where AEC-Q101 is not mandated.
What does the "M3" suffix indicate in SMBJ20A-M3/5B?
The "M3" suffix in SMBJ20A-M3/5B specifies halogen-free, RoHS-compliant construction meeting IPC-1752A material declaration standards, with matte tin-plated leads qualified per JESD 201 Class 2 whisker testing. It distinguishes the part from E3 (RoHS-compliant but not halogen-free) and HM3/HE3 (AEC-Q101 qualified) variants. The SMBJ20A-M3/5B is intended for environmentally regulated commercial and industrial deployments.
How does SMBJ20A-M3/5B differ from bidirectional versions like SMBJ20CA?
SMBJ20A-M3/5B is unidirectional, with polarity marked by a cathode band and functional only in reverse bias; SMBJ20CA is bidirectional, symmetrical in both directions with no polarity marking. Their VBR, VC, and PPPM values differ slightly due to internal structure - SMBJ20CA has higher VBR min/max and distinct clamping behavior. The SMBJ20A-M3/5B cannot substitute for SMBJ20CA without circuit redesign.
What PCB layout guidance applies to SMBJ20A-M3/5B for optimal thermal performance?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad area per terminal to achieve the rated 600 W peak pulse power and 100 °C/W RθJA. Traces to the SMBJ20A-M3/5B should be short and wide to minimize inductance, and ground planes must be solid beneath the device. Thermal vias under pads are recommended for sustained surge duty cycles. Failure to meet pad size degrades both clamping consistency and surge endurance.
SMBJ20A-M3/5B 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):
- 22.2V
- 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ20A-M3/5B FAQ
1.How can I place an order for SMBJ20A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20A-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 SMBJ20A-M3/5B reliable?
The price and inventory of SMBJ20A-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 SMBJ20A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ20A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20A-M3/5B?
SMBJ20A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20A-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 SMBJ20A-M3/5B?
For technical support, including SMBJ20A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20A-M3/5B requirements.
6.How does Aetrix verify that SMBJ20A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ20A-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 SMBJ20A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ20A-M3/5B?
All SMBJ20A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20A-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 SMBJ20A-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ20A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20A-M3/5B Tags
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