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Vishay General Semiconductor - Diodes Division SMBJ20AHM3/H
- Part No.:
- SMBJ20AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20AHM3/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,913
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Product details
Overview
SMBJ20AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform).
For engineers reviewing the SMBJ20AHM3/H datasheet, SMBJ20AHM3/H pinout, SMBJ20AHM3/H application, or SMBJ20AHM3/H equivalent, this device is selected for robust overvoltage protection on DC power rails, MOSFET gate drivers, and sensor signal lines in industrial control, automotive ECUs, and telecom infrastructure where halogen-free, RoHS-compliant, and AEC-Q101-qualified components are required.
Technical Context
The SMBJ20AHM3/H operates as a unidirectional avalanche diode with cathode-band polarity marking, optimized for fast response (<1 ns) to transient events. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, enabling precise clamping during repetitive 10/1000 µs surges at 0.01% duty cycle.
Thermally, it exhibits RθJA = 100 °C/W and RθJL = 20 °C/W, supporting operation from –55 °C to +150 °C junction temperature. The HM3 suffix confirms halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 22.2 V / 24.5 V at 1 mA - Ensures reliable turn-on within defined tolerance band under standardized test conditions |
| VC @ IPPM | 32.4 V at 18.5 A - Clamped voltage during 600 W transient, limiting stress on downstream ICs |
| PPPM | 600 W (10/1000 µs) - Peak surge energy handling capability for industrial-grade transient immunity |
| ID @ VWM | 1.0 µA max - Ultra-low leakage preserves efficiency in battery-powered or high-impedance circuits |
| TJ max | +150 °C - Enables use in under-hood automotive and high-temperature industrial environments |
| Package | SMB (DO-214AA) - Standardized surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C reflow peak). Cathode indicated by band; anode is unmarked end.
| 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 low-impedance return path for clamping action |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 surge immunity without derating in standard PCB layouts |
| AEC-Q101 qualified & halogen-free (HM3) | Meets automotive reliability requirements and environmental compliance for Tier-1 ECU designs |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes voltage overshoot during transients, protecting 24 V-rated logic and analog interfaces |
| Fast response time (<1 ns) | Clamps before ESD or fast-switching transients propagate into sensitive circuitry |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow without moisture-related failures |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate driver ICs and bootstrap circuits against inductive kickback from BLDC motor phase switches. IC Role / Device Role / Timing Role: Unidirectional TVS placed between high-side gate and source, clamping negative-going transients during turn-off. Use Value: Limits voltage excursion to ≤32.4 V, preventing gate oxide damage to 30 V-rated MOSFETs and ensuring long-term drive reliability. | Use Scenario: Input protection for LIN bus transceivers and microcontroller I/O pins exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail and signal lines, absorbing 600 W surges per ISO 7637-2 Pulse 5a. Use Value: Maintains <1 µA leakage at 13.5 V nominal, avoiding quiescent current penalties while meeting AEC-Q101 lifetime validation. |
| Telecom Power Supply Inputs | Factory Automation Sensor Interfaces |
Use Scenario: Secondary-side overvoltage suppression on 24 V DC input rails of PoE-powered network switches and base stations. IC Role / Device Role / Timing Role: Primary clamping element upstream of DC-DC converters, triggered by lightning-induced surges on outdoor cabling. Use Value: Withstands repeated 600 W transients without parameter shift, preserving system uptime in harsh outdoor deployments. | Use Scenario: Protection of analog output lines (4–20 mA) and digital I/O (RS-485) in PLC analog modules subjected to field wiring faults. IC Role / Device Role / Timing Role: Low-capacitance TVS on signal paths, placed adjacent to connector to shunt surge energy before reaching precision DACs or isolators. Use Value: Clamps to 32.4 V within nanoseconds, preventing latch-up in 3.3 V/5 V interface ICs while adding <0.5 pF parasitic capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20AHE3/H | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial-grade industrial equipment without automotive certification needs | Select when halogen-free content and automotive qualification are not required; lower cost alternative |
| SMCJ20A-HM3 | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package with higher thermal mass (RθJA = 50 °C/W) | Better suited for high-repetition-rate surges or elevated ambient temperatures (>85 °C) | Choose when board space allows and thermal performance under sustained surge duty is critical |
Compared with SMBJ20AHE3/H and SMCJ20A-HM3, the SMBJ20AHM3/H uniquely combines halogen-free construction, AEC-Q101 qualification, and SMB footprint-making it optimal for space-constrained automotive and green-industrial designs requiring full regulatory alignment.
Availability
SMBJ20AHM3/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supply inputs requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ20AHM3/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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was developed for high-energy transient suppression in compact surface-mount formats, targeting automotive, industrial, and telecom systems needing robust, standards-compliant overvoltage protection without design compromises.
FAQ
What is the clamping voltage of SMBJ20AHM3/H at its rated peak pulse current?
The SMBJ20AHM3/H has a maximum clamping voltage (VC) of 32.4 V at 18.5 A peak pulse current (IPPM), measured using the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a 600 W transient event and is confirmed in Vishay's datasheet Document Number 88392, page 2.
Is SMBJ20AHM3/H suitable for automotive applications?
Yes, SMBJ20AHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction. It meets automotive reliability requirements for under-hood and body electronics, including temperature cycling, humidity testing, and surge endurance-making it appropriate for use in ECUs, BCMs, and ADAS power domains.
What does the "HM3" suffix mean in SMBJ20AHM3/H?
The "HM3" suffix in SMBJ20AHM3/H denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. It distinguishes this variant from commercial-grade "E3" or "M3" versions and confirms compliance with automotive environmental and reliability standards per Vishay's ordering information table on page 3 of document 88392.
How does SMBJ20AHM3/H differ from SMBJ20AHE3/H?
SMBJ20AHM3/H adds halogen-free material content and AEC-Q101 qualification versus SMBJ20AHE3/H, which is RoHS-compliant but not halogen-free or automotive-qualified. Both share identical electrical specs (VWM = 20 V, VC = 32.4 V), but SMBJ20AHM3/H supports stricter automotive supply chain and emissions requirements.
What is the thermal resistance of SMBJ20AHM3/H from junction to ambient?
The SMBJ20AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the minimum recommended pad layout (0.2" × 0.2" copper pads per terminal). This value is specified in the Thermal Characteristics table on page 3 of Vishay's SMBJ5.0A–SMBJ188A datasheet (88392).
SMBJ20AHM3/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:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SMBJ20AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20AHM3/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/H reliable?
The price and inventory of SMBJ20AHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMBJ20AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20AHM3/H?
SMBJ20AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20AHM3/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/H?
For technical support, including SMBJ20AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20AHM3/H requirements.
6.How does Aetrix verify that SMBJ20AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ20AHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMBJ20AHM3/H?
All SMBJ20AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20AHM3/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/H part is unused and in its original packaging.
Return procedure for SMBJ20AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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