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Vishay General Semiconductor - Diodes Division SMBJ20AHM3_B/H
- Part No.:
- SMBJ20AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20AHM3_B/H.pdf
- Description:
- 600W,20V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,427
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Product details
Overview
SMBJ20AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping inductive switching transients and ESD events on power and signal lines. It features 22.2 V minimum breakdown voltage (VBR), 20 V maximum stand-off voltage (VWM), 32.4 V clamping voltage (VC) at 18.5 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used in automotive sensor protection and industrial I/O interface circuits.
For engineers reviewing the SMBJ20AHM3_B/H datasheet, SMBJ20AHM3_B/H pinout, SMBJ20AHM3_B/H application, or SMBJ20AHM3_B/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), thermal resistance (RθJA = 100 °C/W), and junction temperature range (–55 °C to +150 °C).
Technical Context
This TVS diode operates as a voltage-clamping protection device in series with sensitive downstream circuitry. Its glass-passivated junction enables fast response time (<1 ns), low incremental surge resistance, and stable clamping under repetitive 10/1000 µs transients at 0.01% duty cycle.
The SMBJ20AHM3_B/H is rated for 100 A non-repetitive forward surge current (IFSM) and exhibits a positive temperature coefficient of VBR (+0.094 %/°C), ensuring predictable voltage shift across operating temperature. It meets J-STD-020 MSL Level 1 and JEDEC JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 22.2 V - ensures reliable conduction above normal operating voltage without false triggering |
| VWM | 20 V - maximum continuous reverse voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 32.4 V at 18.5 A - clamping voltage limits downstream IC stress during 600 W transient events |
| PPPM | 600 W - peak pulse power handling capability with standardized 10/1000 µs waveform |
| TJ max | +150 °C - supports operation in under-hood automotive and high-temperature industrial environments |
| RθJA | 100 °C/W - thermal resistance defines derating curve for sustained power dissipation |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated placement and reflow soldering |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band marking on one end; terminals are anode and cathode - no internal circuitry beyond PN junction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input terminal for unidirectional clamping | Connected to protected line; conducts when cathode-to-anode voltage exceeds VBR |
| Cathode | Output/reference terminal | Banded end; ties to ground or lower-potential rail; defines clamping reference point |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance standards without compromising surge robustness or thermal performance |
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy transients common in 12 V/24 V vehicle systems and industrial motor drives |
| Fast response time (<1 ns) | Clamps before transient energy reaches protected ICs, reducing risk of latch-up or gate oxide damage |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage margin required in system-level protection design |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional clamping element placed between signal line and chassis ground. Use Value: Limits transient voltage to ≤32.4 V while maintaining <1 µA leakage at 20 V, preserving signal integrity and ADC accuracy. |
Use Scenario: Safeguarding digital input modules against inductive kickback from solenoids, relays, and contactors in factory automation. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input channels prior to optocoupler or Schmitt trigger. Use Value: Absorbs 600 W surges without degradation, enabling >100,000 surge cycles per IEC 61000-4-5 compliance testing. |
| Power Supply Input Protection | Consumer Appliance Motor Control |
|
Use Scenario: Secondary protection stage after fuse and common-mode choke on 12 V/24 V DC power rails feeding microcontrollers and communication ICs. IC Role / Device Role / Timing Role: Fast-acting shunt device that diverts surge current away from downstream regulators and LDOs. Use Value: Clamps within nanoseconds to prevent brownout or reset events caused by transient-induced voltage sag. |
Use Scenario: Suppressing back-EMF spikes generated by brushed DC motors in washing machines, HVAC blowers, and power tools. IC Role / Device Role / Timing Role: Mounted across motor terminals or H-bridge outputs to clamp bidirectional flyback energy. Use Value: Withstands 100 A single-half-sine surge (8.3 ms), matching typical motor stall current profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20AHE3_B/H | Same electrical specs but RoHS-compliant (E3), not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial-grade industrial equipment where automotive qualification is not required | Select SMBJ20AHE3_B/H only if halogen-free content and AEC-Q101 are not mandated. |
| SMAJ20A-HF | Lower peak pulse power (400 W), smaller SMA package (DO-214AC), higher RθJA (150 °C/W) | Used in space-constrained consumer electronics with lower surge exposure levels | Choose SMAJ20A-HF only when board area is critical and 400 W rating suffices per IEC 61000-4-5 Level 3. |
Compared with SMBJ20AHM3_B/H, SMBJ20AHE3_B/H offers identical clamping performance but reduced environmental compliance and automotive qualification, while SMAJ20A-HF trades power handling and thermal robustness for compact size - making SMBJ20AHM3_B/H optimal for AEC-Q101–required, high-energy industrial and automotive applications.
Availability
SMBJ20AHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and power supply input protection requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMBJ20AHM3_B/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets high-energy transient suppression in harsh environments, engineered for automotive, industrial, and telecom infrastructure where robustness, consistency, and regulatory compliance are mandatory.
FAQ
What is the breakdown voltage tolerance for SMBJ20AHM3_B/H?
The SMBJ20AHM3_B/H has a minimum breakdown voltage (VBR) of 22.2 V and maximum of 24.5 V at 10 mA test current, yielding a ±5.2% tolerance band. This tight specification ensures consistent clamping behavior across production lots and supports precise overvoltage margin allocation in safety-critical designs.
Is SMBJ20AHM3_B/H suitable for bidirectional transient protection?
No - SMBJ20AHM3_B/H is a unidirectional TVS diode, marked with a cathode band and intended for use with defined polarity. For bidirectional protection, Vishay specifies CA-suffix variants (e.g., SMBJ20CA); using SMBJ20AHM3_B/H in reverse-biased configurations risks permanent junction damage due to lack of symmetrical avalanche capability.
Does SMBJ20AHM3_B/H meet automotive qualification standards?
Yes - the HM3 suffix confirms SMBJ20AHM3_B/H is halogen-free, RoHS-compliant, and AEC-Q101 qualified. It has passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per AEC-Q101 Rev D, making it approved for use in engine control units, body electronics, and ADAS sensor modules.
What is the maximum clamping voltage of SMBJ20AHM3_B/H under surge conditions?
The SMBJ20AHM3_B/H clamps to a maximum of 32.4 V at its rated peak pulse current of 18.5 A (10/1000 µs waveform). This value is guaranteed per datasheet Table 1 and verified across temperature range –55 °C to +150 °C, enabling accurate worst-case overvoltage analysis in protected circuit design.
How does the thermal resistance of SMBJ20AHM3_B/H affect PCB layout?
SMBJ20AHM3_B/H has RθJA = 100 °C/W, meaning 1 W of dissipated power raises junction temperature by 100 °C above ambient. To maintain TJ ≤ 150 °C at 50 °C ambient, keep average power below 1 W - achieved via adequate copper pad area (0.2" × 0.2" per terminal) and avoid dense thermal islands under the SMB package.
SMBJ20AHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ20AHM3_B/H FAQ
1.How can I place an order for SMBJ20AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20AHM3_B/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 SMBJ20AHM3_B/H reliable?
The price and inventory of SMBJ20AHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20AHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ20AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20AHM3_B/H?
SMBJ20AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20AHM3_B/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 SMBJ20AHM3_B/H?
For technical support, including SMBJ20AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20AHM3_B/H requirements.
6.How does Aetrix verify that SMBJ20AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ20AHM3_B/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 SMBJ20AHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ20AHM3_B/H?
All SMBJ20AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20AHM3_B/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 SMBJ20AHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ20AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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