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Vishay General Semiconductor - Diodes Division SMCJ120CAHM3_A/I
- Part No.:
- SMCJ120CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120CAHM3_A/I.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,478
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Product details
Overview
SMCJ120CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection of sensitive electronics. It features 120 V standoff voltage (VWM), 193 V maximum clamping voltage (VC) at 7.8 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 μs waveform), commonly deployed on automotive power rails and industrial sensor interfaces.
For engineers reviewing the SMCJ120CAHM3_A/I datasheet, SMCJ120CAHM3_A/I pinout, SMCJ120CAHM3_A/I application, or SMCJ120CAHM3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging an avalanche breakdown mechanism to shunt surge energy away from downstream circuitry. Its bidirectional structure ensures symmetrical clamping in both polarities, with breakdown voltage (VBR) specified between 133 V and 147 V at 1 mA test current - critical for protecting AC-coupled or floating signal lines.
Thermally, it sustains 150 °C maximum junction temperature and exhibits low incremental surge resistance, enabling fast response (<1 ns) to ESD and lightning-induced surges. The SMC package supports 200 A non-repetitive forward surge current (IFSM) for unidirectional variants, though SMCJ120CAHM3_A/I uses bidirectional configuration with no polarity marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V–48 V systems with transient headroom. |
| VC @ IPPM | 193 V - Clamped voltage at 7.8 A peak pulse current (10/1000 μs); determines maximum stress imposed on protected ICs during surge events. |
| PPPM | 1500 W - Peak pulse power handling capability; enables robust protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges. |
| VBR min/max | 133 V / 147 V - Breakdown voltage range at 1 mA; ensures consistent triggering across production lots and temperature extremes. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures without derating. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard PCB pad layout; informs heatsinking requirements for sustained power dissipation. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H). Matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (bidirectional) | One terminal of symmetrical PN junction; accepts surge current in either polarity without polarity marking. |
| Cathode | Transient current sink (bidirectional) | Second terminal of symmetrical PN junction; functions identically to Anode due to bidirectional construction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics per stress-test requirements including HTOL, TCT, and ESD. |
| Halogen-free & RoHS-compliant | Meets JEDEC JS709C and IPC-1752A material declarations; eliminates brominated flame retardants in molding compound. |
| MSL Level 1 | Unlimited floor life at ≤30 °C/60% RH; compatible with standard reflow profiles up to 260 °C peak. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a), improving clamping precision. |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives in humid environments. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and microcontroller power inputs. Use Value: Limits transient voltage to ≤193 V during 120 V load dump events, preventing latch-up or gate oxide damage in downstream MOSFETs and regulators. | Use Scenario: Shielding 4–20 mA current loop transmitters from field wiring surges in factory automation. IC Role / Device Role / Timing Role: Bidirectional shunt protector across loop terminals to absorb induced common-mode transients. Use Value: Maintains loop integrity during 1 kV/500 Ω surge tests (IEC 61000-4-5) without disrupting analog signal accuracy or causing reset events. |
| Telecom Line Card Surge Suppression | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding Ethernet PHY front-ends and PoE injectors against lightning-induced surges on RJ45 ports. IC Role / Device Role / Timing Role: Secondary-level TVS placed after gas discharge tube (GDT) primary protection to refine clamping voltage. Use Value: Reduces residual clamping to 193 V while preserving signal integrity up to 100 MHz due to low junction capacitance (~100 pF at 0 V). | Use Scenario: Protecting BLDC motor driver ICs from back-EMF spikes generated during commutation in HVAC compressors. IC Role / Device Role / Timing Role: DC bus rail clamp across VDD and GND to absorb inductive kickback energy. Use Value: Absorbs 1500 W pulses without degradation, extending MOSFET lifetime and eliminating need for snubber RC networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC120CA | Same VWM (120 V) and PPPM (1500 W), but TO-220AC package; higher RθJA (50 °C/W) and larger footprint. | Requires through-hole mounting and heatsink; unsuitable for high-density SMT layouts. | Select when board space allows larger package and higher thermal mass is needed for repetitive surge duty cycles. |
| SMCJ120AHE3_A/I | Unidirectional variant with identical VWM, VC, and PPPM; includes cathode band marking and slightly lower leakage (<1 μA vs. <1 μA at VWM). | Only suitable for DC-biased rails where polarity is fixed; cannot protect AC or floating nodes. | Choose only if system topology guarantees unidirectional surge direction and polarity alignment is assured. |
Compared with SAC120CA and SMCJ120AHE3_A/I, the SMCJ120CAHM3_A/I delivers optimal balance of SMT compatibility, AEC-Q101 qualification, halogen-free compliance, and symmetrical bidirectional clamping - making it the preferred choice for automotive and industrial SMT designs requiring zero-polarity dependency.
Availability
SMCJ120CAHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom line card prototyping requiring stable component supply and full traceability.
Supply support for SMCJ120CAHM3_A/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, automotive qualification, and high-power handling.
The SMCJ series is engineered specifically for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 compliance and 1500 W surge capability are mandatory.
FAQ
What is the clamping voltage of SMCJ120CAHM3_A/I at its rated peak pulse current?
The SMCJ120CAHM3_A/I has a maximum clamping voltage (VC) of 193 V at its rated peak pulse current (IPPM) of 7.8 A using the standardized 10/1000 μs waveform. This value is measured under defined test conditions per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for protected circuits. The SMCJ120CAHM3_A/I maintains this clamping performance across its operational temperature range of -55 °C to +150 °C.
Is SMCJ120CAHM3_A/I suitable for automotive applications?
Yes, the SMCJ120CAHM3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix "HM3" indicating halogen-free, RoHS-compliant, and AEC-Q101 validated construction. It meets stress test requirements for temperature cycling, high-temperature operating life, and ESD robustness required in engine control units, body electronics, and ADAS modules. The SMCJ120CAHM3_A/I is listed in Vishay's automotive-grade product portfolio with full qualification documentation available upon request.
How does the bidirectional configuration of SMCJ120CAHM3_A/I affect its circuit implementation?
The bidirectional configuration of SMCJ120CAHM3_A/I means it provides symmetrical clamping for both positive and negative transients without polarity sensitivity - ideal for AC-coupled lines, differential pairs, or floating grounds. Unlike unidirectional TVS diodes, the SMCJ120CAHM3_A/I has no cathode band marking and must be placed across terminals without orientation constraints. This simplifies layout and eliminates risk of reverse installation, especially in high-volume SMT assembly where polarity verification is impractical.
What is the thermal resistance of SMCJ120CAHM3_A/I, and how does it impact PCB layout?
The SMCJ120CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB with no internal copper planes. To maintain reliability during repetitive surge events, designers should adhere strictly to Vishay's pad layout guidelines and avoid excessive trace length or narrow traces that increase thermal impedance. The SMCJ120CAHM3_A/I's RθJA directly affects allowable surge repetition rate and steady-state power dissipation limits.
Does SMCJ120CAHM3_A/I meet lead-free and halogen-free compliance standards?
Yes, the "HM3" suffix in SMCJ120CAHM3_A/I confirms halogen-free, RoHS-compliant construction per JEDEC JS709C and IPC-1752A. The molding compound contains no brominated or chlorinated flame retardants, and all terminations are matte tin-plated per J-STD-002. This makes the SMCJ120CAHM3_A/I suitable for environmentally regulated markets including EU, China RoHS II, and Japan J-Moss. Compliance documentation and material declarations are available from Vishay upon request for the SMCJ120CAHM3_A/I.
SMCJ120CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- 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):
- 7.8A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ120CAHM3_A/I FAQ
1.How can I place an order for SMCJ120CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120CAHM3_A/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 SMCJ120CAHM3_A/I reliable?
The price and inventory of SMCJ120CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ120CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120CAHM3_A/I?
SMCJ120CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120CAHM3_A/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 SMCJ120CAHM3_A/I?
For technical support, including SMCJ120CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ120CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ120CAHM3_A/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 SMCJ120CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ120CAHM3_A/I?
All SMCJ120CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120CAHM3_A/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 SMCJ120CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ120CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120CAHM3_A/I Tags
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