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Vishay General Semiconductor - Diodes Division SMBJ120CAHM3_B/I
- Part No.:
- SMBJ120CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CAHM3_B/I.pdf
- Description:
- 600W,120V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,812
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Product details
Overview
SMBJ120CAHM3_B/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 120 V standoff voltage (VWM), 133–147 V breakdown range (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤193 V at 3.1 A peak surge current - used in industrial sensor interface protection and DC power rail surge suppression.
For engineers reviewing the SMBJ120CAHM3_B/I datasheet, SMBJ120CAHM3_B/I pinout, SMBJ120CAHM3_B/I application, or SMBJ120CAHM3_B/I equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, AEC-Q101-qualified halogen-free construction, thermal resistance data, and real-world use cases in automotive-grade power electronics and telecom line protection.
Technical Context
This device operates as a voltage-clamping protector with symmetrical bidirectional conduction - no polarity marking required. Its silicon avalanche junction provides sub-nanosecond response to ESD and lightning-induced transients, with low incremental surge resistance ensuring stable clamping under repetitive 0.01% duty cycle surges.
Designed for surface-mount assembly on 5.0 mm × 5.0 mm copper pads, it meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), supports automated placement, and maintains thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead) under defined mounting conditions.
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 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on during overvoltage events |
| VC (Clamping Voltage) | ≤193 V at IPPM = 3.1 A (10/1000 µs) - peak voltage seen by protected circuit during worst-case transient |
| PPPM (Peak Pulse Power) | 600 W - energy-handling capability for standardized 10/1000 µs surge waveform; enables robust IEC 61000-4-5 compliance |
| ID (Max Reverse Leakage) | 1.0 µA at VWM - negligible standby current; avoids loading sensitive analog or low-power circuits |
| TJ max | +150 °C - maximum junction temperature rating; supports operation in under-hood automotive and industrial enclosures |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMD outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration - no cathode/anode marking; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no polarity dependency in layout |
| Terminal 2 | Anode / Cathode (bidirectional) | Electrically identical to Terminal 1; symmetric conduction enables single-component protection of AC or floating DC lines |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines without polarity concerns |
| 600 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial and telecom equipment |
| AEC-Q101 qualified & halogen-free (HM3 suffix) | Validated for automotive powertrain and body electronics; compliant with RoHS and JESD201 Class 2 whisker resistance |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during surge events - critical for protecting 120 V-rated MOSFETs and gate drivers |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT manufacturing logistics |
Applications
| Industrial Sensor Interface Protection | Automotive Body Control Module (BCM) Power Input |
|---|---|
|
Use Scenario: Protecting 24 V CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional TVS placed across VCC/GND and signal pairs to clamp transients before they reach IC pins. Use Value: Limits voltage excursion to ≤193 V during 3.1 A surge, preventing latch-up or oxide breakdown in 3.3 V/5 V interface ICs downstream. |
Use Scenario: Safeguarding 12 V supply rails feeding microcontrollers, relays, and LED drivers in door modules and lighting control units. IC Role / Device Role / Timing Role: Primary front-end surge suppressor on main power input, upstream of DC-DC converters and LDOs. Use Value: Withstands 12 V system load dump pulses (ISO 7637-2 Pulse 5a) while maintaining <1 µA leakage at nominal voltage. |
| Telecom Line Surge Protection | AC-DC Adapter Secondary-Side Clamping |
|
Use Scenario: Protecting Ethernet PHY interfaces, RS-485 transceivers, and PoE-powered devices against induced lightning surges on outdoor cabling. IC Role / Device Role / Timing Role: Common-mode TVS on differential pair or power-over-data lines, referenced to chassis ground. Use Value: Symmetrical 120 V standoff and 193 V clamping ensure balanced protection without skewing common-mode rejection. |
Use Scenario: Clamping secondary-side rectifier output in offline AC-DC adapters to prevent overvoltage damage during transformer saturation or feedback loop failure. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor to absorb energy from flyback voltage spikes. Use Value: 600 W pulse rating absorbs >100 mJ transient energy without degradation, extending capacitor and controller lifetime. |
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_B/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker qualification | Suitable for commercial-grade industrial equipment where halogen-free requirement is not mandated | Select when cost sensitivity outweighs automotive or high-reliability environmental compliance needs |
| SMBJ120AHE3_B/I | Unidirectional version; includes cathode band marking; VF ≤3.5 V at 50 A forward conduction | Applicable only where DC polarity is fixed and forward conduction must be supported (e.g., DC power input with reverse polarity protection) | Choose only if circuit requires unidirectional clamping with forward surge capability - not drop-in compatible with SMBJ120CAHM3_B/I |
Compared with SMBJ120CAHE3_B/I, the HM3 variant adds halogen-free and enhanced whisker resistance for automotive use; compared with SMBJ120AHE3_B/I, the CA suffix confirms true bidirectional symmetry essential for AC or floating-line protection - neither is pin-compatible with the other due to functional divergence.
Availability
SMBJ120CAHM3_B/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, telecom line protection, and AC-DC adapter secondary-side clamping requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ120CAHM3_B/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, TVS, MOSFETs, and optoelectronics with emphasis on reliability, precision, and application-specific performance.
The SMBJ series targets high-energy transient suppression in space-constrained SMT designs - engineered for automotive, industrial, and telecom systems demanding AEC-Q101 qualification and repeatable clamping behavior under harsh surge conditions.
FAQ
What does the "CA" suffix mean in SMBJ120CAHM3_B/I?
The "CA" suffix in SMBJ120CAHM3_B/I indicates a bidirectional Transient Voltage Suppressor - meaning it clamps voltage transients equally in both polarities, with no cathode marking required. This distinguishes it from unidirectional variants (e.g., SMBJ120A) that conduct only in reverse bias and require correct polarity orientation during PCB layout. SMBJ120CAHM3_B/I is therefore ideal for AC lines, differential signals, or floating DC rails.
Is SMBJ120CAHM3_B/I AEC-Q101 qualified?
Yes, SMBJ120CAHM3_B/I is AEC-Q101 qualified - confirmed by the "HM3" suffix, which denotes halogen-free, RoHS-compliant construction with full automotive stress testing. This qualification covers temperature cycling, humidity bias, mechanical shock, and surge endurance, making SMBJ120CAHM3_B/I suitable for under-hood and body electronics applications where reliability under thermal and vibration stress is mandatory.
What is the clamping voltage of SMBJ120CAHM3_B/I at its rated surge current?
The clamping voltage (VC) of SMBJ120CAHM3_B/I is ≤193 V at a peak pulse current (IPPM) of 3.1 A, measured using the standardized 10/1000 µs double-exponential waveform. This value represents the maximum voltage imposed on the protected circuit during a worst-case transient event, and is directly specified in the Vishay SMBJ5.0A–SMBJ188A datasheet (Document Number 88392, Rev. 09-Jan-2024).
Can SMBJ120CAHM3_B/I replace SMBJ120AHE3_B/I in a design?
No - SMBJ120CAHM3_B/I cannot directly replace SMBJ120AHE3_B/I because they differ fundamentally in functionality: SMBJ120CAHM3_B/I is bidirectional, while SMBJ120AHE3_B/I is unidirectional with a marked cathode. Substituting them would risk improper clamping or forward conduction in DC circuits. Layout, polarity marking, and system-level surge path analysis must be revalidated if changing between CA and A variants.
What is the thermal resistance of SMBJ120CAHM3_B/I, and how does it affect PCB layout?
SMBJ120CAHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures during repetitive surges, designers must provide adequate copper area and avoid excessive trace length - undersized pads increase thermal impedance and risk exceeding the +150 °C maximum junction temperature during high-duty-cycle events.
SMBJ120CAHM3_B/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:
- Active
- 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_B/I FAQ
1.How can I place an order for SMBJ120CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CAHM3_B/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_B/I reliable?
The price and inventory of SMBJ120CAHM3_B/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_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ120CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CAHM3_B/I?
SMBJ120CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CAHM3_B/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_B/I?
For technical support, including SMBJ120CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ120CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ120CAHM3_B/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_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ120CAHM3_B/I?
All SMBJ120CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CAHM3_B/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_B/I part is unused and in its original packaging.
Return procedure for SMBJ120CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120CAHM3_B/I Tags
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Diodes Incorporated
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