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Vishay General Semiconductor - Diodes Division SMBJ120CAHM3/H
- Part No.:
- SMBJ120CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CAHM3/H.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,543
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Product details
Overview
SMBJ120CAHM3/H 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, 600 W peak pulse power (10/1000 μs), clamping voltage of 193 V at 3.1 A IPPM, and operates across -55 °C to +150 °C junction temperature range - deployed in industrial sensor signal lines and telecom interface protection.
For engineers reviewing the SMBJ120CAHM3/H datasheet, SMBJ120CAHM3/H pinout, SMBJ120CAHM3/H application, or SMBJ120CAHM3/H equivalent, this page delivers verified electrical specs, real-world use cases, validated alternatives, thermal behavior, and supply-chain-ready availability details - all grounded in Vishay's official 88392 document revision 09-Jan-2024.
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1 ns), low incremental surge resistance, and stable clamping under repetitive transients. Its symmetrical I-V characteristics enable identical protection in both polarities without polarity marking on the case.
Rated for 600 W peak pulse power with 10/1000 μs waveform and 0.01% duty cycle, it dissipates 5.0 W continuously at TA = 50 °C on infinite heatsink and exhibits 100 °C/W junction-to-ambient thermal resistance - requiring careful PCB copper pad layout per Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 133–147 V at IT = 1 mA - guaranteed conduction onset range; ensures predictable turn-on during transients |
| VC (Clamping Voltage) | 193 V at IPPM = 3.1 A - peak voltage seen by protected circuit during 10/1000 μs surge; limits stress on downstream ICs |
| PPPM (Peak Pulse Power) | 600 W - energy-handling capacity for standardized lightning/surge waveforms; enables IEC 61000-4-5 Level 4 compliance |
| ID (Reverse Leakage) | 1.0 μA max at VWM - minimal standby current; avoids loading of high-impedance signal paths or battery-powered circuits |
| TJ max. | +150 °C - maximum junction temperature; supports operation in under-hood automotive or industrial enclosures |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 2.20 mm min. cathode band width; compatible with automated pick-and-place |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C peak reflow). Bidirectional construction means no polarity marking; both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve as interchangeable surge current entry/exit points; no cathode band marking required for bidirectional types |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional transient suppression | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 combination wave surges up to 4 kV (open-circuit)/2 kA (short-circuit) with proper PCB layout |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during clamping; reduces risk of latch-up or gate oxide damage in protected MOSFETs/ICs |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; suitable for ADAS sensor interfaces |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-20; supports green manufacturing and end-of-life recycling requirements |
Applications
| Industrial Sensor Signal Protection | Telecom Interface Surge Guard |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop sensors and RS-485 transceivers against EFT and lightning-induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Standby shunt protector placed across differential bus lines (A/B) or between signal and ground. Use Value: Limits transient voltage to ≤193 V during 3.1 A surge, preventing damage to MAX1487 or SN65HVD72 transceivers while maintaining signal integrity. |
Use Scenario: Safeguarding Ethernet PHY front-end and PoE injectors against induced surges from nearby AC mains or antenna coupling. IC Role / Device Role / Timing Role: Primary-level TVS on RJ45 magnetics secondary side, coordinated with GDT or MOV secondary-stage protection. Use Value: Responds in <1 ns to clamp common-mode transients, reducing stress on Broadcom BCM54213 or Microchip LAN8742A PHYs during surge events. |
| Automotive Body Control Module (BCM) | Consumer Appliance Motor Drive Inputs |
|
Use Scenario: Securing LIN bus lines and switch inputs in door modules and seat control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamp on LIN data line (VPW) referenced to battery ground, leveraging AEC-Q101 qualification. Use Value: Survives repeated 12 V system transients up to ±100 V/500 ms while maintaining <1 μA leakage at 12 V nominal - critical for low-power wake-up functionality. |
Use Scenario: Shielding microcontroller GPIOs and optocoupler inputs driving BLDC motor controllers in smart washing machines and HVAC fans. IC Role / Device Role / Timing Role: Localized TVS on MCU input pins tied to hall-effect sensor outputs or zero-cross detection circuits. Use Value: Clamps inductive kickback from relay coils or fan windings to ≤193 V, preventing false triggering or reset of STM32G0B1 or PIC16F15323 MCUs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CA-E3/52 | Same VWM/VBR/VC/PPPM specs; RoHS-compliant but not halogen-free or AEC-Q101 qualified | Limited to commercial-grade industrial or consumer systems without automotive qualification requirements | Select when cost sensitivity outweighs automotive reliability needs and halogen-free compliance is not mandated |
| SMLJ120CA | Higher 1500 W PPPM rating; same VWM/VBR but larger SMC (DO-214AB) package (7.11 mm x 6.22 mm vs. SMB's 4.57 mm x 3.94 mm) | Used where higher surge margin is needed and PCB space allows larger footprint; not drop-in compatible due to different pad layout | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and board area permits SMC package |
Compared with SMBJ120CAHM3/H, the E3/52 variant trades AEC-Q101 and halogen-free compliance for lower cost in non-automotive settings, while SMLJ120CA offers 2.5× higher surge power at the expense of footprint size and layout redesign.
Availability
SMBJ120CAHM3/H is available at Aetrix Electronics and suitable for industrial sensor protection, telecom interface hardening, and automotive body electronics requiring stable component supply with full traceability and lifecycle management.
Supply support for SMBJ120CAHM3/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 optimization.
The SMBJ series targets high-reliability transient suppression in space-constrained surface-mount designs, with variants engineered for automotive (HM3/HE3), commercial (E3/M3), and industrial environments requiring repeatable clamping performance.
FAQ
What does the "CA" suffix indicate in SMBJ120CAHM3/H?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ120CAHM3/H provides symmetrical transient suppression for both positive and negative voltage excursions without polarity dependence. Unlike unidirectional "A" variants, it has no cathode marking and is used where AC signals, floating references, or undefined polarity require equal clamping in either direction.
Is SMBJ120CAHM3/H suitable for automotive applications?
Yes - the "HM3" suffix confirms SMBJ120CAHM3/H is halogen-free, RoHS-compliant, and AEC-Q101 qualified per Vishay document 88392. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD, making it appropriate for body electronics, infotainment interfaces, and ADAS sensor protection in passenger vehicles.
How does SMBJ120CAHM3/H compare to unidirectional SMBJ120AHM3/H in clamping behavior?
SMBJ120CAHM3/H clamps identically in both directions with VBR = 133–147 V and VC = 193 V, whereas SMBJ120AHM3/H only clamps in reverse bias and conducts forward like a standard diode (VF ≤ 3.5 V at 50 A). Use SMBJ120CAHM3/H for AC-coupled lines or undefined polarity; use the unidirectional version only when forward conduction must be blocked or leveraged.
What PCB layout practices maximize SMBJ120CAHM3/H surge performance?
To achieve rated 600 W PPPM, mount SMBJ120CAHM3/H on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal as specified in Vishay's datasheet figure notes. Avoid narrow traces between the device and protected node; keep lead lengths short (<2 mm) and use ground planes to reduce inductance - otherwise clamping voltage may exceed 193 V during fast transients.
Does SMBJ120CAHM3/H meet UL 497B recognition?
Yes - Vishay's documentation (document 88392) states "(+)"-marked SMBJ devices, including SMBJ120CAHM3/H, carry Underwriters Laboratories recognition under UL 497B (file E136766) for both unidirectional and bidirectional configurations. This validates its suitability for primary-side surge protection in telecom and industrial equipment requiring UL certification.
SMBJ120CAHM3/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:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SMBJ120CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CAHM3/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 SMBJ120CAHM3/H reliable?
The price and inventory of SMBJ120CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ120CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CAHM3/H?
SMBJ120CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CAHM3/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 SMBJ120CAHM3/H?
For technical support, including SMBJ120CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CAHM3/H requirements.
6.How does Aetrix verify that SMBJ120CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ120CAHM3/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 SMBJ120CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ120CAHM3/H?
All SMBJ120CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CAHM3/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 SMBJ120CAHM3/H part is unused and in its original packaging.
Return procedure for SMBJ120CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120CAHM3/H Tags
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