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Vishay General Semiconductor - Diodes Division SMBJ120CAHM3_A/H
- Part No.:
- SMBJ120CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CAHM3_A/H.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,033
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Product details
Overview
SMBJ120CAHM3_A/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 stand-off 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, and operates across –55 °C to +150 °C junction temperature range - deployed in industrial sensor signal lines and power supply rails.
For engineers reviewing the SMBJ120CAHM3_A/H datasheet, SMBJ120CAHM3_A/H pinout, SMBJ120CAHM3_A/H application, or SMBJ120CAHM3_A/H equivalent, this page delivers verified electrical specs, thermal behavior, AEC-Q101 qualification status, bidirectional clamping performance, and real-world design implications for surge immunity in automotive-grade and industrial control systems.
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 50 °C ambient on infinite heatsink. Thermal resistance is 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), supporting reliable operation in compact PCB layouts with minimal copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR (min/max) | 133 V / 147 V at 1 mA - Confirmed breakdown range ensures predictable turn-on during surges without premature conduction |
| VC @ IPPM | 193 V at 3.1 A - Clamping voltage limits downstream IC stress during 600 W transient events |
| PPPM | 600 W - Peak pulse power handling capability per 10/1000 µs waveform supports IEC 61000-4-5 Level 4 compliance |
| ID @ VWM | 1.0 µA max - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss |
| TJ Range | –55 °C to +150 °C - Wide junction temperature range enables deployment in under-hood automotive and industrial environments |
| Package | SMB (DO-214AA) - Surface-mount footprint (5.21 mm × 4.06 mm × 2.20 mm) compatible with automated placement and reflow |
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 cathode/anode marking; terminals are symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no polarity marking required |
| Terminal 2 | Anode / Cathode (bidirectional) | Electrically identical to Terminal 1; forms symmetrical clamping path for ± transients |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power | Withstands high-energy surges per IEC 61000-4-5 (10/1000 µs) without degradation |
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for industrial and consumer end equipment |
| Low thermal resistance (RθJL = 20 °C/W) | Supports efficient heat transfer to PCB copper pads, enabling sustained operation under repeated surges |
Applications
| Industrial Sensor Signal Protection | Automotive Power Rail Clamping |
|---|---|
|
Use Scenario: Protecting 4–20 mA current loop outputs and analog sensor inputs (e.g., pressure, temperature) from ESD and load dump-induced transients in factory automation PLCs. IC Role / Device Role / Timing Role: Standby shunt protector that remains non-conductive until transient exceeds 120 V, then clamps within nanoseconds to limit voltage seen by op-amps and ADCs. Use Value: Prevents latch-up or damage to precision analog front-ends while maintaining <1 µA leakage at nominal 24 V supply. |
Use Scenario: Safeguarding 12 V battery-fed ECUs against ISO 7637-2 pulse 1 (inductive switch-off) and pulse 3a/b (load dump simulation) in passenger vehicles. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly at power entry point, absorbing up to 600 W surges without requiring series impedance. Use Value: Enables compliance with AEC-Q100 Grade 2 temperature requirements and sustains operation up to +150 °C junction temperature. |
| Telecom Line Interface Protection | Consumer Device USB/DisplayPort ESD Guard |
|
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs from lightning-induced surges on outdoor telecom wiring in base station backhaul links. IC Role / Device Role / Timing Role: Fast-acting bidirectional clamp placed before line driver/receiver ICs to divert common-mode transients away from differential data paths. Use Value: Maintains signal integrity with <2 pF junction capacitance at zero bias, avoiding data rate degradation on 10 Mbps+ links. |
Use Scenario: Adding secondary-level ESD protection on USB-C and DisplayPort receptacles in laptops and docking stations exposed to human-body model (HBM) discharges. IC Role / Device Role / Timing Role: Secondary TVS stage after integrated ESD diodes in port controllers, handling higher-energy events (>30 kV contact discharge). Use Value: Provides 193 V clamping at 3.1 A to prevent catastrophic failure of Type-C CC logic and DP AUX channel circuitry. |
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/H | Same electrical specs and SMB package, but RoHS-compliant commercial grade (non-halogen-free); lacks halogen-free certification | Suitable for non-automotive industrial use where halogen-free mandate does not apply | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not needed |
| SMAJ120CAHM3_A/H | Lower 400 W peak pulse power rating; same VWM/VBR, but higher clamping voltage (220 V @ 1.8 A); SMA (DO-214AC) package (smaller footprint) | Acceptable for lower-energy surge environments (e.g., Class B IEC 61000-4-5) with space-constrained layouts | Choose only if board space is critical and system-level surge testing confirms 400 W sufficiency |
Compared with SMBJ120CAHM3_A/H, the HE3 variant trades halogen-free compliance for lower cost in commercial applications, while the SMAJ120CAHM3_A/H reduces surge capacity and increases clamping voltage to fit smaller PCB footprints - neither offers drop-in replacement due to differing power ratings and package dimensions.
Availability
SMBJ120CAHM3_A/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive power rail protection, and telecom line conditioning requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ120CAHM3_A/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, power efficiency, and automotive-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMBJ120CAHM3_A/H at its rated peak pulse current?
The SMBJ120CAHM3_A/H has a maximum clamping voltage (VC) of 193 V at its specified peak pulse current (IPPM) of 3.1 A, measured using a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuits during worst-case surge events and is confirmed in Vishay's official datasheet revision 09-Jan-2024 (Document Number: 88392). The SMBJ120CAHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMBJ120CAHM3_A/H suitable for automotive applications?
Yes, SMBJ120CAHM3_A/H is AEC-Q101 qualified and specifically designated for automotive use, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, AEC-Q101 qualified). It meets stringent reliability, thermal, and surge endurance requirements for engine control modules, body electronics, and ADAS sensor interfaces. The SMBJ120CAHM3_A/H operates up to +150 °C junction temperature and passes vibration, temperature cycling, and humidity tests per AEC-Q101.
Does SMBJ120CAHM3_A/H have polarity markings on the package?
No, SMBJ120CAHM3_A/H does not feature polarity markings because it is a bidirectional TVS diode. Its symmetrical construction allows either terminal to serve as anode or cathode depending on transient polarity, eliminating the need for cathode bands or other orientation indicators. This simplifies layout and assembly for AC-coupled or floating signal paths where polarity reversal is possible.
What is the maximum reverse leakage current for SMBJ120CAHM3_A/H at its stand-off voltage?
The SMBJ120CAHM3_A/H exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 120 V stand-off voltage (VWM), tested at 25 °C ambient. This ultra-low leakage ensures minimal impact on high-impedance sensor circuits and battery-powered systems. The SMBJ120CAHM3_A/H maintains tight leakage control even at elevated temperatures, supporting stable operation in industrial and automotive environments.
How does the SMBJ120CAHM3_A/H package compare to SMA and SMC variants?
The SMBJ120CAHM3_A/H uses the SMB (DO-214AA) package - measuring 5.21 mm × 4.06 mm × 2.20 mm - which offers higher power handling than the smaller SMA (DO-214AC) and lower profile than the larger SMC (DO-214AB). Compared to SMAJ120CAHM3_A/H, the SMBJ120CAHM3_A/H delivers 50 % more peak pulse power (600 W vs. 400 W) and lower clamping voltage. Unlike SMCJ120CAHM3_A/H, it retains compatibility with standard pick-and-place equipment for mid-density boards.
SMBJ120CAHM3_A/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:
- 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/H FAQ
1.How can I place an order for SMBJ120CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CAHM3_A/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_A/H reliable?
The price and inventory of SMBJ120CAHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ120CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CAHM3_A/H?
SMBJ120CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CAHM3_A/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_A/H?
For technical support, including SMBJ120CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ120CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ120CAHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ120CAHM3_A/H?
All SMBJ120CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CAHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMBJ120CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120CAHM3_A/H Tags
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