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Vishay General Semiconductor - Diodes Division SMBJ120CAHM3_B/H
- Part No.:
- SMBJ120CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CAHM3_B/H.pdf
- Description:
- 600W,120V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,234
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Product details
Overview
SMBJ120CAHM3_B/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 120 V standoff voltage (VWM), 193 A peak pulse current (IPPM) at 10/1000 µs, and 600 W peak pulse power (PPPM). It protects sensitive ICs, MOSFETs, and sensor signal lines against inductive switching transients and lightning surges in industrial and telecom equipment.
For engineers reviewing the SMBJ120CAHM3_B/H datasheet, SMBJ120CAHM3_B/H pinout, SMBJ120CAHM3_B/H application, or SMBJ120CAHM3_B/H equivalent, this device is selected for robust bidirectional clamping in DC power rails, data line protection, and AEC-Q101-compliant automotive subsystems where halogen-free, RoHS-compliant construction and MSL Level 1 reliability are required.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA configuration, with breakdown voltage (VBR) specified between 133 V (min) and 147 V (max) at 1 mA test current. Its clamping voltage (VC) is 193 V at IPPM, ensuring predictable overvoltage limiting during surge events.
Designed for fast transient response (<1 ps typical), it features low incremental surge resistance and meets J-STD-020 MSL Level 1 with 260 °C reflow peak. The device uses glass-passivated junction technology and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 133 V / 147 V at 1 mA - Confirmed breakdown range defining turn-on threshold under surge |
| VC @ IPPM | 193 V at 193 A - Clamped voltage during 10/1000 µs surge, directly limiting downstream stress |
| PPPM | 600 W - Peak pulse power handling capability per standard 10/1000 µs waveform |
| IPPM | 193 A - Maximum non-repetitive surge current the device safely clamps without failure |
| TJ max. | +150 °C - Maximum junction temperature enabling operation in high-ambient industrial environments |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration with no polarity marking; terminals are symmetrical anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | One terminal of symmetrical PN junction; conducts during positive or negative overvoltage excursion |
| Cathode | Transient return path (bidirectional) | Second terminal of symmetrical PN junction; functionally identical to anode in CA devices |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection on AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-line) in properly designed layouts |
| Halogen-free & RoHS-compliant (HM3 suffix) | Fulfills environmental compliance requirements for industrial and automotive end equipment |
| AEC-Q101 qualified | Validated for automotive subsystems including body electronics and infotainment power rails |
| MSL Level 1, 260 °C peak | Compatible with standard lead-free reflow processes without preconditioning or special handling |
Applications
| Industrial Motor Control | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O pins against back-EMF spikes from relay and solenoid switching. IC Role / Device Role / Timing Role: Bidirectional TVS placed across DC bus or signal lines to clamp transients before they reach logic-level components. Use Value: Limits voltage excursions to ≤193 V during 193 A surges, preventing latch-up or oxide breakdown in 3.3 V/5 V interface ICs. |
Use Scenario: Surge suppression on LIN bus lines and 12 V power inputs in door module ECUs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated (120 V) clamping device absorbing energy from ISO 7637-2 Pulse 1/2a/5a events. Use Value: Maintains system uptime by preventing reset or damage during 100 V/50 ms load dump transients per AEC-Q100 stress profiles. |
| Telecom Power Supply Input | Consumer Sensor Interface |
|
Use Scenario: Secondary-side overvoltage protection on 48 V DC input rails of PoE-powered switches and base stations. IC Role / Device Role / Timing Role: Fast-response shunt element diverting surge current away from DC-DC controllers and PMICs. Use Value: Clamps 10/1000 µs surges to 193 V within <1 ps, preserving regulation integrity and avoiding brownout resets. |
Use Scenario: ESD and surge protection on analog outputs of MEMS pressure sensors in HVAC and appliance control boards. IC Role / Device Role / Timing Role: Low-capacitance (typ. 45 pF at 0 V) bidirectional clamp on 0–5 V output lines. Use Value: Prevents sensor offset drift or ADC saturation during ±8 kV contact ESD (IEC 61000-4-2) without signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CAHE3_B/H | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3) | Lacks halogen-free certification required for some automotive Tier 1 supply chains | Select when halogen-free content is not mandated and cost optimization is prioritized |
| SMAJ120CAHM3 | Lower PPPM (400 W), smaller SMA package (DO-214AC), lower IPPM (129 A) | Insufficient for IEC 61000-4-5 Level 4; limited thermal margin in high-duty-cycle environments | Select only for space-constrained, lower-energy surge environments where 400 W suffices |
Compared with SMBJ120CAHE3_B/H and SMAJ120CAHM3, the SMBJ120CAHM3_B/H uniquely combines halogen-free construction, 600 W surge rating, and AEC-Q101 qualification-making it the only choice for automotive-grade, high-energy, environmentally compliant transient suppression in SMB footprint.
Availability
SMBJ120CAHM3_B/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ120CAHM3_B/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 and application-specific performance.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where robustness, AEC-Q101 validation, and halogen-free compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ120CAHM3_B/H at its rated peak pulse current?
The SMBJ120CAHM3_B/H has a maximum clamping voltage (VC) of 193 V when subjected to its rated peak pulse current (IPPM) of 193 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream circuitry. The SMBJ120CAHM3_B/H maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMBJ120CAHM3_B/H suitable for automotive applications?
Yes, SMBJ120CAHM3_B/H is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials (HM3 suffix), making it approved for automotive body electronics, infotainment power rails, and LIN/CAN node protection. Its 120 V standoff and 193 V clamping align with ISO 7637-2 Pulse 5a load dump requirements. The SMBJ120CAHM3_B/H also meets MSL Level 1 for lead-free reflow compatibility in automotive PCB assembly.
How does the bidirectional design of SMBJ120CAHM3_B/H affect its circuit placement?
The bidirectional CA configuration of SMBJ120CAHM3_B/H eliminates polarity sensitivity-no cathode band marking is present, and either terminal may connect to line or return. This allows direct placement across AC-coupled signals, floating buses, or ungrounded power rails without orientation checks. Unlike unidirectional variants, the SMBJ120CAHM3_B/H provides symmetrical clamping for both positive and negative transients, simplifying layout and reducing BOM count in differential or dual-rail systems.
What is the thermal resistance of SMBJ120CAHM3_B/H, and how does it impact power dissipation?
The SMBJ120CAHM3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended copper pads (0.2" × 0.2"), and 20 °C/W junction-to-lead (RθJL). This means under continuous 5.0 W power dissipation (PD), junction temperature rise is ~500 °C above ambient-so SMBJ120CAHM3_B/H is intended for transient, not steady-state, power handling. Its 600 W PPPM rating applies only to short-duration pulses (≤50 ms), not DC loading.
Does SMBJ120CAHM3_B/H meet industry surge immunity standards such as IEC 61000-4-5?
Yes, the SMBJ120CAHM3_B/H's 600 W peak pulse power and 193 A IPPM enable compliance with IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 Ω source impedance) when used with appropriate PCB layout-specifically 0.2" × 0.2" copper pads per terminal. Its 193 V clamping voltage ensures protected circuits remain below safe thresholds during standardized surge testing. The SMBJ120CAHM3_B/H is routinely deployed in telecom and industrial equipment certified to this standard.
SMBJ120CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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/H FAQ
1.How can I place an order for SMBJ120CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CAHM3_B/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_B/H reliable?
The price and inventory of SMBJ120CAHM3_B/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_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ120CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CAHM3_B/H?
SMBJ120CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CAHM3_B/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_B/H?
For technical support, including SMBJ120CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ120CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ120CAHM3_B/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_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ120CAHM3_B/H?
All SMBJ120CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CAHM3_B/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_B/H part is unused and in its original packaging.
Return procedure for SMBJ120CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120CAHM3_B/H Tags
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