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Vishay General Semiconductor - Diodes Division SMBJ120CAHM3/I
- Part No.:
- SMBJ120CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CAHM3/I.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,170
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Product details
Overview
SMBJ120CAHM3/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), 193 A peak pulse current (IPPM) under 10/1000 µs waveform, and 600 W peak pulse power dissipation - deployed to protect MOSFETs, ICs, and sensor interfaces in industrial and telecom equipment.
For engineers reviewing the SMBJ120CAHM3/I datasheet, SMBJ120CAHM3/I pinout, SMBJ120CAHM3/I application, or SMBJ120CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), thermal resistance (RθJA = 100 °C/W), and junction temperature rating up to +150 °C.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction enables fast response time (<1 ns), low incremental surge resistance, and stable clamping performance under repetitive transient stress.
The device is rated for 600 W peak pulse power (10/1000 µs), derated linearly above 25 °C ambient per Fig. 2, and supports 8.3 ms half-sine surge current up to 100 A only in unidirectional variants - not applicable to SMBJ120CAHM3/I due to its bidirectional construction.
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 conduction onset; ensures predictable turn-on during overvoltage events |
| VC (Clamping Voltage) | 193 V at IPPM = 193 A - peak voltage seen by protected circuit during worst-case transient; critical for downstream component survivability |
| PPPM (Peak Pulse Power) | 600 W - energy-handling capacity under standardized 10/1000 µs surge; determines protection level against lightning or inductive spikes |
| IPPM (Peak Pulse Current) | 193 A - maximum non-repetitive surge current supported; sets minimum trace width and PCB layout requirements |
| TJmax | +150 °C - maximum junction temperature; enables operation in high-ambient environments such as motor drives or outdoor telecom enclosures |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs heatsinking necessity in sustained surge scenarios |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C reflow peak), matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | One side of symmetrical bidirectional structure; no polarity marking on device body |
| Cathode | Current exit terminal in forward bias | Other side of symmetrical bidirectional structure; functionally identical to Anode under reverse polarity |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines or differential signals without polarity concerns |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance requirements for industrial and consumer end-equipment |
| 600 W peak pulse power | Provides robust immunity against IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) |
| Fast response time (<1 ns) | Clamps transients before sensitive downstream components experience damaging overvoltage |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of DC bus inputs against switching transients from IGBT gate drive noise and regenerative braking spikes. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp ±150 V surges within 1 ns. Use Value: Prevents latch-up or oxide rupture in upstream DC-DC controllers and isolators by limiting voltage excursion to ≤193 V. |
Use Scenario: Input-stage surge suppression on -48 V telecom rectifier outputs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on secondary-side distribution rails prior to POL converters. Use Value: Maintains system uptime by absorbing 600 W transient energy without degradation, verified per IEC 61000-4-5. |
| Automotive Body Control Modules | Industrial Sensor Signal Conditioning |
|
Use Scenario: CAN bus power rail protection in BCMs subjected to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Bidirectional suppressor co-located with fuse and reverse-polarity protection FET. Use Value: Survives AEC-Q101 stress tests and clamps 12 V system transients to safe levels for 3.3 V microcontroller I/O. |
Use Scenario: Overvoltage safeguard on 4–20 mA analog sensor loop inputs in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector interface to shunt ESD and cable discharge events. Use Value: Preserves signal integrity with <1 pF junction capacitance at zero bias, avoiding measurement drift or offset errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CAHE3/I | Same electrical specs, but RoHS-compliant without halogen-free certification (E3 vs HM3) | Lacks halogen-free compliance required for certain EU industrial standards | Select SMBJ120CAHE3/I only if halogen-free material declaration is not mandated |
| SMAJ120CAHM3 | Lower 400 W PPPM, smaller SMA package (DO-214AC), higher RθJA = 140 °C/W | Insufficient for IEC 61000-4-5 Level 4; limited thermal margin in enclosed enclosures | Use SMAJ120CAHM3 only in space-constrained, low-energy surge environments |
Compared with SMBJ120CAHE3/I, SMBJ120CAHM3/I adds halogen-free compliance without sacrificing clamping performance; versus SMAJ120CAHM3, it delivers 50 % higher surge power handling and superior thermal dissipation in the same footprint family.
Availability
SMBJ120CAHM3/I is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and industrial sensor signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ120CAHM3/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 and application-specific optimization.
The SMBJ series targets high-energy transient suppression in harsh environments, engineered for automotive, industrial, and telecom systems where failure resilience and regulatory compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ120CAHM3/I at its rated peak pulse current?
The SMBJ120CAHM3/I 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 defines the upper voltage limit imposed on protected circuitry during surge events - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings. The SMBJ120CAHM3/I maintains this clamping performance across its full operating temperature range.
Is SMBJ120CAHM3/I suitable for automotive applications?
Yes, SMBJ120CAHM3/I is AEC-Q101 qualified, meaning it has passed stress tests including high-temperature reverse bias, temperature cycling, and ESD robustness required for automotive electronic modules. Its halogen-free (HM3) and RoHS-compliant construction meets Tier 1 supplier material requirements. The SMBJ120CAHM3/I is commonly used in body control units, infotainment power rails, and LIN/CAN interface protection where bidirectional surge immunity and long-term reliability are essential.
How does the HM3 suffix differ from E3 or HE3 in SMBJ120CAHM3/I?
The HM3 suffix in SMBJ120CAHM3/I denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-201 Class 2 whisker resistance, whereas E3 indicates RoHS-compliant but not halogen-free, and HE3 adds AEC-Q101 qualification without halogen-free assurance. SMBJ120CAHM3/I uniquely combines all three attributes: automotive qualification, RoHS compliance, and halogen-free materials - making it suitable for environmentally regulated industrial and automotive programs where substance restrictions are enforced.
What is the thermal resistance of SMBJ120CAHM3/I, and how does it affect layout?
SMBJ120CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimal PCB copper; reducing pad area increases thermal impedance and risks exceeding the +150 °C max junction temperature during repeated surges. For high-duty-cycle applications, designers should extend copper pours or add thermal vias - the SMBJ120CAHM3/I's low RθJL of 20 °C/W supports efficient heat transfer to internal layers.
Does SMBJ120CAHM3/I have polarity markings, and how is it installed?
No, SMBJ120CAHM3/I has no polarity markings because it is a bidirectional TVS diode - its anode and cathode terminals are functionally symmetric and interchangeable in circuit placement. Unlike unidirectional variants (e.g., SMBJ120A), the SMBJ120CAHM3/I lacks a cathode band. Installation requires no orientation check; it can be placed across any two points needing bidirectional overvoltage protection, such as AC power inputs, differential data lines, or floating sensor references - simplifying assembly and reducing misplacement risk.
SMBJ120CAHM3/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:
- 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/I FAQ
1.How can I place an order for SMBJ120CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CAHM3/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/I reliable?
The price and inventory of SMBJ120CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMBJ120CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CAHM3/I?
SMBJ120CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CAHM3/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/I?
For technical support, including SMBJ120CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CAHM3/I requirements.
6.How does Aetrix verify that SMBJ120CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ120CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMBJ120CAHM3/I?
All SMBJ120CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMBJ120CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120CAHM3/I Tags
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Diodes Incorporated
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