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Vishay General Semiconductor - Diodes Division SMBJ20AHM3/I
- Part No.:
- SMBJ20AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20AHM3/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,287
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Product details
Overview
SMBJ20AHM3/I 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 capability with 10/1000 µs waveform.
For engineers reviewing the SMBJ20AHM3/I datasheet, SMBJ20AHM3/I pinout, SMBJ20AHM3/I application, or SMBJ20AHM3/I 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 low clamping voltage and fast response (<1 ns) are critical.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, conducting only in reverse bias above its breakdown threshold while remaining high-impedance below VWM. Its glass-passivated junction ensures stable leakage performance (≤1.0 µA at 20 V) and long-term reliability under repetitive surge stress.
The device is rated for 150 °C maximum junction temperature, exhibits 0.094 %/°C temperature coefficient of VBR, and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility. It is halogen-free and RoHS-compliant (HM3 suffix), and qualified to AEC-Q101 when ordered with HE3/HM3 automotive suffixes.
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 range ensures reliable triggering without premature conduction. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamping voltage during 10/1000 µs surge; limits downstream voltage stress to <33 V. |
| PPPM | 600 W - Peak pulse power handling with standard 10/1000 µs waveform; supports IEC 61000-4-5 Level 3/4 surge immunity. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage preserves power efficiency in battery-backed or low-quiescent circuits. |
| TJ max. | +150 °C - Enables operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band marking on one end. Mounting uses 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per datasheet recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events (IFSM = 100 A). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V rail); initiates avalanche conduction when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity up to 4 kV (line-to-ground) in properly laid-out PCBs. |
| 32.4 V clamping at 18.5 A | Restricts transient overvoltage on 24 V systems to ≤33 V, protecting 30 V-rated MOSFETs and logic ICs. |
| MSL Level 1, 260 °C reflow | Supports single-pass lead-free assembly without moisture sensitivity concerns or baking requirements. |
| Halogen-free, RoHS-compliant (HM3) | Fulfills environmental compliance mandates for industrial and automotive OEM supply chains. |
| AEC-Q101 qualification option | Available with HM3_X suffix for automotive applications requiring validated reliability under temperature cycling and humidity testing. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate driver ICs and bootstrap FETs against inductive kickback from 24 V solenoid and relay coils. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between gate and source, triggered within <1 ns to limit VGS spikes to <33 V. Use Value: Prevents gate oxide rupture in 30 V MOSFETs and avoids false turn-on during coil de-energization. |
Use Scenario: Surge suppression on LIN bus power rail and sensor supply lines exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V/24 V auxiliary rail, activated before system-level fuses blow. Use Value: Maintains microcontroller reset integrity and prevents EEPROM corruption during 200 ms, 35 V load dump events. |
| Telecom Power Feeds | Consumer Appliance Control Boards |
Use Scenario: Input-side protection of DC-DC converters receiving PoE-derived 48 V or AC/DC adapter outputs. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of input capacitors and EMI filters. Use Value: Absorbs 600 W surges without degradation, preserving converter controller lifetime and reducing need for redundant clamping stages. |
Use Scenario: Protection of MCU I/O pins and Hall-effect sensor inputs in washing machine motor control boards. IC Role / Device Role / Timing Role: Localized TVS on 5 V/3.3 V sensor supply and feedback lines, mounted adjacent to connectors. Use Value: Eliminates field returns due to ESD-induced latch-up on microcontroller peripherals during service technician handling. |
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-M3/52 | Same electrical specs, but commercial-grade (non-AEC-Q101), RoHS-compliant with M3 halogen-free finish. | Approved for industrial and consumer use; not certified for automotive under-hood deployment. | Select when AEC-Q101 qualification is not required and cost optimization is prioritized. |
| SAC20 | Lower PPPM (400 W), higher VC (36 V at 12.5 A), same VWM (20 V); SOD-123FL package (smaller, lower thermal mass). | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4; requires layout review for thermal derating. | Choose only for space-constrained designs with verified surge energy <400 W and ambient <100 °C. |
Compared with SMBJ20A-M3/52, SMBJ20AHM3/I adds AEC-Q101 qualification and traceable lot control for automotive programs; compared with SAC20, it delivers 50 % higher surge power headroom and 3.6 V lower clamping-critical for protecting 30 V MOSFETs in motor drives.
Availability
SMBJ20AHM3/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ20AHM3/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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting design-in across automotive, industrial automation, and infrastructure equipment where failure modes must be mitigated at the component level.
FAQ
What is the clamping voltage of SMBJ20AHM3/I at its rated peak pulse current?
The SMBJ20AHM3/I has a maximum clamping voltage (VC) of 32.4 V at 18.5 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and guarantees that downstream components see no more than 32.4 V during a defined surge event, making SMBJ20AHM3/I suitable for safeguarding 30 V-rated MOSFETs and 3.3 V/5 V logic interfaces fed from 24 V rails.
Is SMBJ20AHM3/I qualified for automotive applications?
Yes, SMBJ20AHM3/I is halogen-free, RoHS-compliant, and AEC-Q101 qualified-confirmed by the "HM3" suffix and documented in Vishay's ordering information table. The "I" denotes 13-inch tape-and-reel packaging, and the part meets stress testing requirements for temperature cycling, humidity, and mechanical shock per AEC-Q101 Rev D, enabling use in body control modules, lighting drivers, and infotainment power supplies.
How does the SMBJ20AHM3/I differ from the SMBJ20A-E3/52 variant?
The SMBJ20AHM3/I differs from SMBJ20A-E3/52 in three key ways: it uses halogen-free molding compound (HM3 vs. E3), carries AEC-Q101 qualification (vs. commercial-grade E3), and ships in 13-inch tape-and-reel (I) versus 7-inch (52). Electrically, both share identical VWM (20 V), VBR (22.2–24.5 V), and VC (32.4 V), but SMBJ20AHM3/I supports automotive production traceability and extended thermal reliability.
What is the maximum reverse leakage current for SMBJ20AHM3/I at 20 V?
The maximum reverse leakage current (ID) for SMBJ20AHM3/I is 1.0 µA at 20 V (VWM) and 25 °C, as specified in the Electrical Characteristics table. This ultra-low leakage ensures minimal power loss in always-on circuits such as battery-backed sensors or standby power rails, and remains stable across temperature due to the device's glass-passivated junction construction.
Can SMBJ20AHM3/I be used in bidirectional protection circuits?
No, SMBJ20AHM3/I is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, Vishay specifies the "CA" suffix (e.g., SMBJ20CA). Using SMBJ20AHM3/I in bidirectional applications would result in forward conduction during negative transients, potentially damaging the device or failing to suppress the surge-always match polarity suffix to circuit topology.
SMBJ20AHM3/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:
- 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/I FAQ
1.How can I place an order for SMBJ20AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20AHM3/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 SMBJ20AHM3/I reliable?
The price and inventory of SMBJ20AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20AHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ20AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20AHM3/I?
SMBJ20AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20AHM3/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 SMBJ20AHM3/I?
For technical support, including SMBJ20AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20AHM3/I requirements.
6.How does Aetrix verify that SMBJ20AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ20AHM3/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 SMBJ20AHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ20AHM3/I?
All SMBJ20AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20AHM3/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 SMBJ20AHM3/I part is unused and in its original packaging.
Return procedure for SMBJ20AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20AHM3/I Tags
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