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Vishay General Semiconductor - Diodes Division SMBJ20AHM3_A/H
- Part No.:
- SMBJ20AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20AHM3_A/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,386
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Product details
Overview
SMBJ20AHM3_A/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, and 600 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMBJ20AHM3_A/H datasheet, SMBJ20AHM3_A/H pinout, SMBJ20AHM3_A/H application, or SMBJ20AHM3_A/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 subsystems, and telecom infrastructure where AEC-Q101 qualification, halogen-free RoHS compliance, and low incremental surge resistance are critical.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, leveraging a glass-passivated silicon junction for fast response (<1 ps) and stable clamping performance under repetitive surge conditions. Its thermal resistance (RθJA = 100 °C/W) and junction temperature range (–55 °C to +150 °C) support reliable operation in high-ambient environments when mounted on 5.0 mm × 5.0 mm copper pads.
The SMBJ20AHM3_A/H is rated for 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and exhibits 1.0 µA max reverse leakage at VWM, ensuring minimal standby power loss. Its MSL Level 1 moisture sensitivity and matte tin-plated leads meet J-STD-002 solderability requirements for automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V systems. |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - Confirmed breakdown threshold ensures predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamping voltage limits downstream IC stress during 600 W surge events; enables protection of 3.3 V–24 V logic and power stages. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform supports IEC 61000-4-5 Level 4 surge immunity compliance. |
| IFSM | 100 A - Single half-sine surge rating allows robust protection against motor commutation spikes and relay coil flyback. |
| TJ max | +150 °C - High junction temperature rating enables use in under-hood automotive modules and industrial enclosures without derating. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with JEDEC MS-012. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional configuration with cathode band marking on one end. Dimensions: 5.59 mm × 4.06 mm × 2.20 mm (L × W × H); terminals are matte tin-plated for lead-free reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or return path; forms clamping loop with cathode during transient events. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24 V rail or sensor output); band-marked end indicates polarity for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against severe IEC 61000-4-5 surges without cascaded TVS or external current limiting. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per JESD22 standards. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU Directive 2011/65/EU and IPC-1752A material declarations; supports green manufacturing and end-of-life recycling. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD > 15 kV), improving clamping precision for sensitive analog inputs. |
| MSL Level 1 (260 °C peak) | Eliminates bake-out requirement prior to reflow; supports standard Pb-free assembly processes without moisture-induced popcorn failure. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protecting 24 V supply rail and CAN transceiver I/O lines from load dump and inductive switching transients in vehicle door modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power rail and ground, responding within picoseconds to limit voltage excursions below 33 V. Use Value: Prevents latch-up or permanent damage to microcontrollers and LIN/CAN transceivers during ISO 7637-2 Pulse 5a (load dump) events up to 60 V. |
Use Scenario: Shielding 24 V digital input channels from field-wiring induced surges caused by solenoid valve switching in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input optocoupler terminals to shunt transient energy before it reaches isolation barrier. Use Value: Maintains functional safety integrity by limiting transient voltage to <33 V, preserving optocoupler CMTI and preventing false triggering of PLC logic. |
| Telecom Power Supply Front-End | Consumer Appliance Motor Driver Board |
|
Use Scenario: Safeguarding AC/DC converter primary-side control ICs and secondary-side monitoring circuits against lightning-induced surges on 48 V telecom distribution lines. IC Role / Device Role / Timing Role: Primary-side clamping device placed across bulk capacitor terminals to absorb differential-mode surge energy. Use Value: Reduces need for multi-stage protection; 600 W rating handles 10/1000 µs surges per IEC 61000-4-5 Ed. 3, Level 4 without thermal runaway. |
Use Scenario: Protecting gate drivers and bootstrap capacitors in BLDC motor inverters from shoot-through-inducing voltage spikes during PWM commutation. IC Role / Device Role / Timing Role: Localized TVS on low-side MOSFET source-to-ground path to clamp Miller-induced gate voltage overshoot. Use Value: Ensures gate oxide integrity by limiting transient voltage to ≤33 V, avoiding unintended turn-on and cross-conduction failures. |
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_A/H | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification; same electrical specs and SMB package. | Suitable for commercial/industrial designs where automotive qualification and halogen-free materials are not mandated. | Select when cost optimization is prioritized and environmental compliance only requires RoHS, not halogen-free or automotive grade. |
| SMAJ20A-M3/A | Lower 400 W PPPM; SMA (DO-214AC) package with smaller 4.5 mm × 2.7 mm footprint; identical VWM/VC ratings. | Better suited for space-constrained consumer electronics where 600 W surge headroom is not required. | Choose for compact layouts needing reduced board area, accepting lower surge margin for non-automotive or non-industrial use cases. |
Compared with SMBJ20AHM3_A/H, the SMBJ20AHE3_A/H offers identical protection performance without halogen-free or AEC-Q101 assurance, while the SMAJ20A-M3/A trades 33 % lower surge power for 30 % smaller footprint-making the SMBJ20AHM3_A/H optimal for automotive and high-reliability industrial deployments demanding full specification compliance.
Availability
SMBJ20AHM3_A/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and telecom power systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for SMBJ20AHM3_A/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 performance.
The SMBJ series was developed for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, surge robustness, and consistent clamping behavior are mandatory.
FAQ
What is the clamping voltage of SMBJ20AHM3_A/H at its rated peak pulse current?
The SMBJ20AHM3_A/H has a maximum clamping voltage (VC) of 32.4 V at 18.5 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ20AHM3_A/H maintains this clamping performance across its operational temperature range, making it suitable for protecting 24 V systems where downstream components require strict overvoltage limits.
Is SMBJ20AHM3_A/H qualified for automotive applications?
Yes, SMBJ20AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88392. This qualification covers stress tests including temperature cycling, highly accelerated life testing (HALT), and mechanical shock, validating its suitability for automotive body electronics, infotainment power supplies, and ADAS sensor interfaces. The SMBJ20AHM3_A/H meets the reliability requirements for under-hood and cabin-mounted modules operating up to +150 °C junction temperature.
What does the "HM3" suffix indicate in SMBJ20AHM3_A/H?
The "HM3" suffix in SMBJ20AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Specifically, "H" identifies the automotive-grade variant, "M" specifies halogen-free molding compound, and "3" confirms RoHS compliance per EU Directive 2011/65/EU. This distinguishes it from "HE3" (AEC-Q101 + RoHS, but not halogen-free) and "E3" (commercial RoHS only). The SMBJ20AHM3_A/H thus satisfies Tier 1 automotive supplier material declarations and green manufacturing mandates.
How does SMBJ20AHM3_A/H differ from bidirectional TVS diodes like SMBJ20CA?
The SMBJ20AHM3_A/H is unidirectional and functions as a polarity-sensitive clamp-conducting only during reverse-biased overvoltage events-whereas SMBJ20CA is bidirectional and clamps symmetrically for AC-coupled or floating signal lines. The SMBJ20AHM3_A/H has a cathode band for orientation-dependent placement and supports higher IFSM (100 A vs. 50 A for SMBJ20CA), making it preferred for DC power rail protection. Its VBR and VC values apply only in reverse direction, unlike the bidirectional SMBJ20CA which specifies identical parameters for both polarities.
What PCB layout guidance applies to SMBJ20AHM3_A/H for optimal surge performance?
For optimal surge performance, SMBJ20AHM3_A/H must be mounted on minimum 5.0 mm × 5.0 mm copper pads per terminal, as specified in Vishay datasheet 88392. Short, wide traces to ground and protected line minimize inductance, preserving sub-nanosecond response. Thermal relief should be avoided on pads to ensure low RθJL (20 °C/W). The SMBJ20AHM3_A/H cathode band must align with schematic polarity; incorrect orientation renders it ineffective against positive transients. No additional series impedance is needed due to its low incremental resistance.
SMBJ20AHM3_A/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:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SMBJ20AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20AHM3_A/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_A/H reliable?
The price and inventory of SMBJ20AHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ20AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20AHM3_A/H?
SMBJ20AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20AHM3_A/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_A/H?
For technical support, including SMBJ20AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20AHM3_A/H requirements.
6.How does Aetrix verify that SMBJ20AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ20AHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ20AHM3_A/H?
All SMBJ20AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20AHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMBJ20AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20AHM3_A/H Tags
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