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Vishay General Semiconductor - Diodes Division SMBJ120CAHM3_A/I
- Part No.:
- SMBJ120CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CAHM3_A/I.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,580
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Product details
Overview
SMBJ120CAHM3_A/I from Vishay General Semiconductor is a bidirectional 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 standoff 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 ≤328 V while delivering 600 W peak pulse power - deployed on power rails and signal lines in industrial motor drives and telecom interface circuits.
For engineers reviewing the SMBJ120CAHM3_A/I datasheet, SMBJ120CAHM3_A/I pinout, SMBJ120CAHM3_A/I application, or SMBJ120CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamped crowbar during transient events: when reverse voltage exceeds VWM = 120 V, it avalanches at VBR = 133–147 V (1 mA test current) and limits surge voltage to VC ≤ 328 V at IPPM = 193 A. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
Constructed with glass-passivated silicon junction and matte tin-plated leads, SMBJ120CAHM3_A/I meets J-STD-002 solderability and JESD22-B102 whisker resistance Class 2. It is rated for TJ = –55 to +150 °C operation and MSL Level 1 per J-STD-020 (peak reflow 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (Breakdown Voltage) | 133–147 V at 1 mA - guaranteed avalanche onset range defining protection threshold |
| VC (Clamping Voltage) | ≤328 V at IPPM = 193 A - peak voltage seen by protected circuit during worst-case 10/1000 µs surge |
| PPPM (Peak Pulse Power) | 600 W - transient energy absorption capacity under standardized 10/1000 µs waveform |
| IPPM (Peak Pulse Current) | 193 A - maximum non-repetitive surge current the device safely conducts without failure |
| TJmax | +150 °C - maximum junction temperature enabling reliable operation in high-ambient environments |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, guiding heatsinking requirements on standard 5 mm × 5 mm copper pads |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Identical bidirectional terminals - either terminal may connect to line or return; no cathode band marking |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating signal paths without polarity-sensitive layout |
| AEC-Q101 qualified | Validated reliability for automotive powertrain and body electronics requiring extended temperature cycling and humidity exposure |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance mandates for industrial and consumer end equipment without compromising surge performance |
| 600 W peak pulse power (10/1000 µs) | Supports robust immunity against IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) in compact SMB footprint |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response time), improving protection margin for downstream ICs |
Applications
| Industrial Motor Drives | Telecom Interface Protection |
|---|---|
|
Use Scenario: Protection of gate driver supply rails and feedback sensing lines against inductive switching spikes from IGBT/MOSFET half-bridges. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed across DC bus or isolated signal inputs to limit transient excursions below IC absolute maximum ratings. Use Value: Prevents latch-up or permanent damage to isolated amplifiers and PWM controllers during 100–200 V nanosecond-scale turn-off spikes. |
Use Scenario: Surge suppression on RS-485/RS-422 data lines exposed to lightning-induced surges in outdoor base stations and network switches. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between differential pair and transceiver IC to shunt common-mode transients. Use Value: Maintains signal integrity during 4 kV IEC 61000-4-5 surges by clamping differential voltage to <328 V, preserving receiver input tolerance. |
| Automotive Body Control Modules | Consumer Power Adapters |
|
Use Scenario: Input rail protection for LIN bus nodes and LED driver modules subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply input, coordinated with upstream fuse and downstream LDO. Use Value: Survives 35 V/100 ms load dump events and 100 A/50 ms ISO 7637-2 Pulse 5a without degradation, ensuring module uptime. |
Use Scenario: Secondary-side transient suppression on USB-C PD output rails and auxiliary 5/9/12 V outputs in multi-port wall adapters. IC Role / Device Role / Timing Role: Final-stage clamping device after DC-DC converter, guarding connected devices against output overvoltage faults. Use Value: Limits fault voltage to ≤328 V during converter control loop failure, preventing USB port IC damage and meeting UL 62368-1 safety margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CAHE3_A/I | Same electrical specs, but RoHS-compliant commercial grade (not halogen-free); lacks AEC-Q101 qualification | Suitable for non-automotive industrial or consumer use where halogen-free requirement is absent | Select when cost sensitivity outweighs halogen-free mandate and automotive qualification is unnecessary |
| SAC120CA | Same VWM/VBR/VC, but in SMC (DO-214AB) package - larger footprint, higher IPPM (212 A), RθJA = 65 °C/W | Better thermal performance and surge margin, but requires PCB redesign due to larger 7.11 mm × 6.22 mm outline | Choose when higher surge endurance or lower thermal resistance is critical and board space permits SMC footprint |
Compared with SMBJ120CAHM3_A/I, the HE3 variant trades halogen-free compliance for lower cost in non-automotive settings, while SAC120CA offers superior thermal and surge handling at the expense of PCB real estate - making SMBJ120CAHM3_A/I optimal for space-constrained, automotive-grade, halogen-free designs.
Availability
SMBJ120CAHM3_A/I is available at Aetrix Electronics and suitable for industrial motor drives, telecom interface protection, automotive body control modules, and consumer power adapters requiring stable component supply with full traceability and lifecycle management.
Supply support for SMBJ120CAHM3_A/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 space-constrained, high-reliability applications - engineered for fast response, low clamping, and robust surge handling across automotive, industrial, and communications systems.
FAQ
What does the 'CA' suffix indicate in SMBJ120CAHM3_A/I?
The 'CA' suffix denotes a bidirectional configuration: SMBJ120CAHM3_A/I provides symmetrical clamping for both positive and negative voltage transients, eliminating polarity concerns during PCB layout. Unlike unidirectional variants (e.g., SMBJ120A), it has no cathode marking and functions identically regardless of terminal orientation - essential for protecting AC-coupled or differential interfaces.
Is SMBJ120CAHM3_A/I qualified for automotive applications?
Yes, SMBJ120CAHM3_A/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's ordering information table. This qualification validates its performance under automotive-grade stress tests including temperature cycling, humidity bias, and mechanical shock - making it suitable for body electronics, infotainment power supplies, and LIN bus protection in production vehicles.
What is the maximum clamping voltage of SMBJ120CAHM3_A/I under surge conditions?
The maximum clamping voltage (VC) of SMBJ120CAHM3_A/I is 328 V, measured at its peak pulse current (IPPM) of 193 A under the standardized 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and must be verified against downstream IC absolute maximum ratings to ensure safe operation.
How does the HM3 suffix differ from E3 or M3 in Vishay's SMBJ series?
The HM3 suffix in SMBJ120CAHM3_A/I indicates halogen-free, RoHS-compliant, and AEC-Q101 qualified construction - distinguishing it from E3 (RoHS-compliant commercial), M3 (halogen-free RoHS-compliant commercial), and HE3 (RoHS-compliant + AEC-Q101). HM3 ensures full compliance with automotive environmental and reliability standards, including JESD201 Class 2 whisker resistance and MSL Level 1 reflow capability.
Can SMBJ120CAHM3_A/I be used in place of a unidirectional SMBJ120A?
No - SMBJ120CAHM3_A/I is bidirectional and cannot replace unidirectional SMBJ120A in circuits requiring forward conduction or DC blocking in one direction only. While both share identical VWM (120 V) and VC (328 V), the unidirectional part conducts forward current up to 100 A (IFSM) and has a cathode band; SMBJ120CAHM3_A/I lacks forward rectification capability and has no polarity marking, limiting it to pure clamping roles.
SMBJ120CAHM3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ120CAHM3_A/I FAQ
1.How can I place an order for SMBJ120CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CAHM3_A/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 SMBJ120CAHM3_A/I reliable?
The price and inventory of SMBJ120CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ120CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CAHM3_A/I?
SMBJ120CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CAHM3_A/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 SMBJ120CAHM3_A/I?
For technical support, including SMBJ120CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ120CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ120CAHM3_A/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 SMBJ120CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ120CAHM3_A/I?
All SMBJ120CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CAHM3_A/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 SMBJ120CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ120CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120CAHM3_A/I Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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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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