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Vishay General Semiconductor - Diodes Division SMBJ120AHM3_B/H
- Part No.:
- SMBJ120AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120AHM3_B/H.pdf
- Description:
- 600W,120V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,658
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Product details
Overview
SMBJ120AHM3_B/H 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 sensitive electronics. It features a 120 V stand-off voltage (VWM), 133–147 V breakdown voltage (VBR) at 1 mA, 193 A peak pulse current (IPPM) under 10/1000 µs waveform, and clamps transients to ≤193 V at rated surge. It is widely deployed to protect MOSFETs, ICs, and sensor signal lines in industrial power supplies and telecom interfaces.
For engineers reviewing the SMBJ120AHM3_B/H datasheet, SMBJ120AHM3_B/H pinout, SMBJ120AHM3_B/H application, or SMBJ120AHM3_B/H equivalent, this page delivers verified electrical specs, thermal behavior, AEC-Q101 qualification status, packaging details, and real-world protection use cases - all aligned with Vishay's 09-Jan-2024 revision of document 88392.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging an avalanche breakdown mechanism to divert transient energy away from downstream circuitry. Its low incremental surge resistance and fast response time (<1 ns) ensure effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
Rated for 600 W peak pulse power (10/1000 µs), it sustains repetitive surges at 0.01% duty cycle and operates across -55 °C to +150 °C junction temperature range. The halogen-free, RoHS-compliant HM3 suffix confirms compliance with JESD201 Class 2 whisker resistance and MSL Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working margin below breakdown. |
| VBR (min/max) | 133 V / 147 V at IT = 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | ≤193 V at 193 A - Clamping voltage under full-rated surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 600 W - Peak pulse power handling capability with 10/1000 µs waveform; validates suitability for industrial-level surge immunity. |
| IFSM | 100 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports protection against short-duration line faults. |
| TJ max | +150 °C - Maximum junction temperature; enables reliable operation in high-ambient environments like motor drives or base stations. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs PCB thermal design requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Cathode indicated by band marking; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side for transient current path | Connected to protected line (e.g., DC bus or signal trace); carries surge current into device during clamping. |
| Cathode | Output side tied to ground or reference rail | Provides low-impedance return path to ground; must be routed with minimal inductance to preserve clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validated surge handling for IEC 61000-4-5 Level 4 (4 kV) protection without derating on standard PCB layout. |
| AEC-Q101 qualified (HM3 suffix) | Qualified for automotive powertrain and body electronics where reliability under thermal cycling and vibration is mandatory. |
| Halogen-free & RoHS-compliant | Meets global environmental regulations and enables use in consumer, industrial, and medical equipment with strict material declarations. |
| MSL Level 1 (260 °C peak reflow) | Supports standard SMT assembly without pre-baking; eliminates moisture-related popcorning risk during reflow. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot during clamping, reducing stress on downstream 150 V-rated MOSFETs or interface ICs. |
Applications
| Industrial Motor Drives | Telecom Power Interfaces |
|---|---|
|
Use Scenario: Protection of gate drivers and IGBTs against inductive kickback from contactor switching and motor commutation. IC Role / Device Role / Timing Role: Unidirectional TVS placed between gate driver output and power switch source, clamping negative-going transients. Use Value: Limits gate-source voltage to ≤193 V, preventing destructive breakdown of 200 V-rated SiC MOSFETs during 100 A+ switching events. |
Use Scenario: Surge protection on -48 V DC telecom power feed lines exposed to lightning-induced surges in central office equipment. IC Role / Device Role / Timing Role: Primary front-end clamp on input rail, coordinated with upstream MOVs and downstream DC-DC converters. Use Value: Absorbs up to 600 W of transient energy while maintaining <1 µA leakage at -48 V, ensuring no standby power loss. |
| Automotive Body Control Modules | Industrial Sensor Signal Conditioning |
|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load dump and jump-start transients in BCMs. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN line and chassis ground, with cathode grounded. Use Value: Clamps 12 V system transients to ≤193 V within <1 ns, preserving signal integrity and meeting ISO 16750-2 pulse 5a requirements. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA loops) and digital sensor interfaces (I²C, SPI) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Point-of-entry TVS on sensor PCB, placed immediately before connector or level-shifter IC. Use Value: Provides ±15 kV HBM ESD protection per IEC 61000-4-2 while adding <1 pF capacitance - negligible impact on 100 kHz sensor bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120AHE3_B/H | Same electrical specs and SMB package, but RoHS-compliant (E3) instead of halogen-free (HM3); no AEC-Q101 qualification. | Suitable for commercial-grade industrial or consumer designs where halogen-free mandate or automotive qualification is not required. | Select when cost optimization is prioritized and environmental compliance only requires RoHS, not halogen-free materials. |
| SMCJ120A-HM3 | Same VWM, VBR, and VC, but in larger SMC (DO-214AB) package with 1500 W PPPM rating and higher IPPM (328 A). | Better suited for high-energy surge environments (e.g., outdoor AC mains interfaces) where PCB space allows larger footprint. | Choose when surge immunity requirement exceeds 600 W or when thermal margin must accommodate >100 °C ambient without derating. |
Compared with SMBJ120AHM3_B/H, the E3 variant trades halogen-free compliance for lower cost in non-automotive settings, while the SMCJ120A-HM3 offers higher surge capacity at the expense of board area - making SMBJ120AHM3_B/H optimal for space-constrained, automotive-qualified, medium-energy protection.
Availability
SMBJ120AHM3_B/H is available at Aetrix Electronics and suitable for industrial motor drives, telecom power interfaces, automotive body control modules, and industrial sensor signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ120AHM3_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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMBJ series targets high-reliability transient suppression in space-constrained, high-volume applications - engineered for automotive, industrial, and telecom systems demanding AEC-Q101 validation and consistent surge immunity.
FAQ
What is the clamping voltage of SMBJ120AHM3_B/H at its rated peak pulse current?
The SMBJ120AHM3_B/H has a maximum clamping voltage (VC) of 193 V when subjected to its rated peak pulse current (IPPM) of 193 A under the standardized 10/1000 µs waveform. This value is measured per Vishay's datasheet revision 09-Jan-2024 (document 88392) and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. Maintaining VC ≤ 193 V ensures compatibility with 200 V-rated power semiconductors downstream.
Is SMBJ120AHM3_B/H qualified for automotive applications?
Yes, SMBJ120AHM3_B/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its ordering code and explicitly stated in Vishay's datasheet notes. This qualification covers stress tests including temperature cycling, humidity bias, mechanical shock, and ESD - validating its suitability for automotive body electronics, powertrain subsystems, and infotainment interfaces where reliability under harsh conditions is critical. The SMBJ120AHM3_B/H meets these requirements without derating.
What does the "HM3" suffix indicate in SMBJ120AHM3_B/H?
The "HM3" suffix in SMBJ120AHM3_B/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS but not halogen-free). Per Vishay's ordering information table, HM3 parts meet JESD201 Class 2 whisker resistance and MSL Level 1 reflow profile (260 °C peak), making SMBJ120AHM3_B/H appropriate for high-reliability, environmentally regulated deployments.
How does SMBJ120AHM3_B/H compare to bidirectional TVS diodes like SMBJ120CA?
SMBJ120AHM3_B/H is unidirectional and intended for DC line protection where polarity is fixed (e.g., +12 V rails), offering lower leakage and tighter VBR tolerance than bidirectional variants. In contrast, SMBJ120CA protects AC or polarity-agnostic lines but exhibits doubled ID at VWM. For a 120 V DC system, SMBJ120AHM3_B/H provides superior clamping precision and lower standby current - critical in battery-powered or low-power sensor nodes where SMBJ120AHM3_B/H leakage remains ≤1.0 µA.
What PCB layout guidance applies to SMBJ120AHM3_B/H for optimal surge performance?
To maximize SMBJ120AHM3_B/H effectiveness, route the cathode directly to a low-inductance ground plane using wide, short traces - ideally with thermal relief minimized and copper pour connected via multiple vias. Mount on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay's thermal characteristics table. Avoid daisy-chaining ground connections; place SMBJ120AHM3_B/H as close as possible to the protected port or IC input to reduce parasitic inductance that degrades clamping speed and voltage overshoot.
SMBJ120AHM3_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):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 3.1A
- 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)
SMBJ120AHM3_B/H FAQ
1.How can I place an order for SMBJ120AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120AHM3_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 SMBJ120AHM3_B/H reliable?
The price and inventory of SMBJ120AHM3_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 SMBJ120AHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ120AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120AHM3_B/H?
SMBJ120AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120AHM3_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 SMBJ120AHM3_B/H?
For technical support, including SMBJ120AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120AHM3_B/H requirements.
6.How does Aetrix verify that SMBJ120AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ120AHM3_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 SMBJ120AHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ120AHM3_B/H?
All SMBJ120AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120AHM3_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 SMBJ120AHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ120AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120AHM3_B/H Tags
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