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Vishay General Semiconductor - Diodes Division SMBJ120AHM3/I
- Part No.:
- SMBJ120AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120AHM3/I.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,848
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Product details
Overview
SMBJ120AHM3/I 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 120 V stand-off voltage (VWM), 133–147 V breakdown voltage (VBR) at 1 mA, 193 A peak pulse current (IPPM), 600 W peak pulse power (10/1000 µs), and clamps transients to ≤193 V. It is widely deployed in industrial power supplies and motor drive circuits to protect MOSFETs and control ICs from inductive switching surges.
For engineers reviewing the SMBJ120AHM3/I datasheet, SMBJ120AHM3/I pinout, SMBJ120AHM3/I application, or SMBJ120AHM3/I equivalent, this page delivers verified electrical parameters, thermal behavior, AEC-Q101 qualification status, clamping performance under standardized surge waveforms, and real-world design guidance for transient suppression in high-reliability DC power rails and signal interfaces.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its specified VBR range (133–147 V). Its low incremental surge resistance ensures minimal voltage overshoot during fast transients, while its 100 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad sizing per Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) layout for rated 600 W pulse handling.
The SMBJ120AHM3/I is halogen-free and RoHS-compliant (HM3 suffix), qualified to AEC-Q101 for automotive-grade reliability, and exhibits a temperature coefficient of VBR at +0.108 %/°C - enabling predictable derating above 25 °C ambient. Its 1.0 µA max reverse leakage at VWM supports low-power standby integrity in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - maximum continuous reverse operating voltage before significant conduction begins; defines safe DC rail margin. |
| VBR (Breakdown Voltage) | 133–147 V at 1 mA - guaranteed avalanche initiation window; used to set minimum system overvoltage trip threshold. |
| VC (Clamping Voltage) | ≤193 V at IPPM = 193 A (10/1000 µs) - peak voltage seen by protected circuit during worst-case surge; determines downstream component voltage rating. |
| PPPM (Peak Pulse Power) | 600 W - maximum transient energy absorption capability under standard 10/1000 µs waveform; defines single-event surge survivability. |
| ID (Reverse Leakage) | ≤1.0 µA at VWM - negligible standby current draw; critical for low-power sensor nodes and battery-operated devices. |
| TJ max. | +150 °C - maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures. |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by a band on the body; anode is unmarked end. Meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line (e.g., +12 V rail); conducts surge current to ground when Vreverse > VBR. |
| Anode (unbanded end) | Reference/ground return path | Typically tied to system ground plane; must be low-inductance connection to maintain effective clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against high-energy inductive kickback (e.g., relay coils, solenoids) without device failure. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and chassis applications requiring extended temperature cycling and humidity resistance. |
| Halogen-free & RoHS-compliant | Meets global environmental compliance mandates (e.g., EU RoHS Directive 2011/65/EU) without compromising surge performance. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on downstream components - critical for protecting 200 V-rated MOSFETs or gate drivers. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of H-bridge MOSFETs against back-EMF spikes during PWM switching in 24 V DC motor controllers. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus input to clamp inductive transients before they reach power stage FETs. Use Value: Limits transient voltage to ≤193 V, ensuring MOSFETs with 200 V VDSS remain within safe SOA during repetitive 193 A surge events. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins from load dump and jump-start surges in door module ECUs. IC Role / Device Role / Timing Role: Standoff-clamp TVS on 12 V supply rail upstream of LDO regulators feeding MCU and CAN/LIN PHYs. Use Value: Withstands 600 W pulses and maintains <1 µA leakage at 12 V, preserving sleep-mode current budget while meeting ISO 7637-2 Pulse 5a immunity. |
| Telecom Power Feeds | Renewable Energy Inverters |
|
Use Scenario: Overvoltage protection on -48 V DC telecom rectifier outputs exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary unidirectional clamp on negative rail, oriented to conduct surge current toward ground reference. Use Value: Clamps 10/1000 µs surges to ≤193 V with <10 ns response time, preventing latch-up in downstream PMICs and FPGA configuration circuits. |
Use Scenario: DC-link surge suppression in solar string inverters where PV array open-circuit voltage reaches 1000 V, but local DC bus is 400–600 V. IC Role / Device Role / Timing Role: Secondary-level TVS on auxiliary 12 V control rail, guarding gate drivers and isolation amplifiers from coupling transients. Use Value: 120 V VWM provides 2× margin over nominal 12 V rail while delivering 193 A surge capacity - sufficient for IEC 61000-4-5 Level 4 testing. |
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/I | Same electrical specs, but RoHS-compliant (E3) without halogen-free certification; not AEC-Q101 qualified. | Suitable for commercial/industrial use only; excludes automotive under-hood deployment. | Select when halogen-free requirement is absent and AEC-Q101 is not mandated. |
| SMBJ120A-M3/5B | Identical electrical and mechanical specs; differs only in packaging (13" reel, 3200 pcs) and base P/N suffix format. | No functional difference; same application scope and reliability profile as SMBJ120AHM3/I. | Choose based on volume procurement needs and preferred tape-and-reel logistics - no design impact. |
Compared with SMBJ120AHE3/I, the SMBJ120AHM3/I adds halogen-free compliance and AEC-Q101 qualification - essential for automotive Tier 1 suppliers - while SMBJ120A-M3/5B offers identical performance in alternate packaging, enabling drop-in sourcing flexibility without layout or validation changes.
Availability
SMBJ120AHM3/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, long-term lifecycle support, and AEC-Q101 assurance.
Supply support for SMBJ120AHM3/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, efficiency, and application-specific optimization.
The SMBJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where robustness, low leakage, and precise clamping are non-negotiable.
FAQ
What is the clamping voltage of SMBJ120AHM3/I at its rated peak pulse current?
The SMBJ120AHM3/I clamps to a maximum of 193 V when subjected to its rated peak pulse current of 193 A under the standard 10/1000 µs waveform. This value is measured at the device terminals with proper PCB layout (0.2" × 0.2" copper pads per terminal) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ120AHM3/I achieves this with low incremental surge resistance, minimizing overshoot beyond VC.
Is SMBJ120AHM3/I suitable for automotive applications?
Yes, SMBJ120AHM3/I is AEC-Q101 qualified and carries the HM3 suffix denoting halogen-free, RoHS-compliant, and automotive-grade reliability. It is explicitly rated for operation from −55 °C to +150 °C junction temperature and validated for temperature cycling, humidity resistance, and mechanical shock - making it appropriate for body control modules, lighting drivers, and infotainment power rails where transient immunity is critical.
How does the VBR tolerance of SMBJ120AHM3/I affect circuit design?
The SMBJ120AHM3/I has a specified VBR range of 133 V to 147 V at 1 mA test current, representing ±5% tolerance around the nominal 140 V midpoint. Designers must ensure that the protected circuit's maximum allowable transient voltage exceeds 147 V to avoid premature conduction, while maintaining sufficient margin below the protected device's absolute maximum rating - e.g., selecting 200 V-rated MOSFETs when using SMBJ120AHM3/I for DC bus protection.
What is the thermal resistance of SMBJ120AHM3/I, and how does it impact PCB layout?
The SMBJ120AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To sustain repeated 600 W pulses or elevated ambient temperatures, designers must allocate adequate copper area and consider thermal vias to inner ground planes. Reducing RθJA via enhanced layout directly improves surge repetition rate capability and long-term reliability.
Does SMBJ120AHM3/I have polarity marking, and how is it identified?
Yes, SMBJ120AHM3/I is a unidirectional TVS diode with explicit polarity marking: a cathode band is printed on the banded end of the SMB (DO-214AA) package. During PCB layout, the banded end must connect to the line being protected (e.g., +12 V rail), while the unbanded (anode) end connects to ground. Incorrect orientation renders the device ineffective against positive transients and may cause catastrophic failure under reverse bias.
SMBJ120AHM3/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):
- 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/I FAQ
1.How can I place an order for SMBJ120AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120AHM3/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 SMBJ120AHM3/I reliable?
The price and inventory of SMBJ120AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120AHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ120AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120AHM3/I?
SMBJ120AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120AHM3/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 SMBJ120AHM3/I?
For technical support, including SMBJ120AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120AHM3/I requirements.
6.How does Aetrix verify that SMBJ120AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ120AHM3/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 SMBJ120AHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ120AHM3/I?
All SMBJ120AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120AHM3/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 SMBJ120AHM3/I part is unused and in its original packaging.
Return procedure for SMBJ120AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120AHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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