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Vishay General Semiconductor - Diodes Division SMCJ120CAHM3/I
- Part No.:
- SMCJ120CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120CAHM3/I.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,075
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Product details
Overview
SMCJ120CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 1500 W peak pulse power rating, 193 V maximum clamping voltage at 7.8 A peak pulse current, and 120 V standoff voltage. It protects sensitive signal lines and power rails in automotive ECUs, industrial I/O modules, and telecom interface circuits against lightning-induced transients and inductive switching spikes.
For engineers reviewing the SMCJ120CAHM3/I datasheet, SMCJ120CAHM3/I pinout, SMCJ120CAHM3/I application, or SMCJ120CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with 10/1000 µs surge waveforms per IEC 61000-4-5.
Technical Context
This device operates as a voltage-clamped crowbar during overvoltage events, leveraging an avalanche breakdown mechanism with low incremental surge resistance and fast sub-nanosecond response time. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity sensitivity in AC-coupled or differential signal paths.
Designed for surface-mount automated assembly, it features glass-passivated junctions, matte tin-plated leads compliant with J-STD-002, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. The SMC package provides thermal resistance of 15 °C/W junction-to-lead and supports 200 A unidirectional surge current (not applicable to bidirectional variant).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 120 V - Maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 133–147 V at 1 mA - Confirmed avalanche initiation range under standardized test conditions |
| Clamping Voltage (VC) | 193 V at 7.8 A IPPM - Peak voltage seen by protected circuit during full-rated 10/1000 µs surge |
| Peak Pulse Power (PPPM) | 1500 W - Energy-handling capacity for transient suppression per IEC 61000-4-5 Class 4 |
| Package | SMC (DO-214AB) - Industry-standard 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint |
| Temperature Range | −55 °C to +150 °C - Full operational range suitable for under-hood automotive and industrial environments |
| Qualification | AEC-Q101 qualified - Validated for automotive reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMC (DO-214AB), 2-terminal surface-mount case with no polarity marking for bidirectional operation. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H), cathode band omitted per bidirectional design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive half-cycle) | Conducts during positive overvoltage excursions; forms symmetrical path with Cathode |
| Cathode | Transient current entry point (negative half-cycle) | Conducts during negative overvoltage excursions; forms symmetrical path with Anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance in both directions eliminates need for polarity-aware layout |
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTGB, TCT, and ESD robustness per stress test plan |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with JEDEC JS709E and EU RoHS Directive 2011/65/EU |
| Low clamping ratio | VC/VWM = 1.61 enables tighter protection margins versus 120 V rail without overdesigning downstream components |
| MSL Level 1 moisture sensitivity | Unlimited floor life at ≤30 °C/60% RH, enabling standard SMT reflow without dry-pack requirements |
Applications
| Automotive Body Control Module (BCM) | Industrial RS-485 Communication Port |
|---|---|
Use Scenario: Protects LIN/CAN signal lines and power inputs in BCMs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply rail and bidirectional data lines. Use Value: Withstands 1500 W surges while limiting clamped voltage to 193 V, preventing damage to MCU I/O and transceivers. | Use Scenario: Shields RS-485 transceivers (e.g., SN65HVD230) from ESD and surge events on field wiring. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pair (A/B) and common-mode line (GND or VCC). Use Value: Symmetrical clamping ensures equal protection for both signal polarities without polarity-dependent failure modes. |
| Telecom DSL Line Interface | Medical Patient Monitor Sensor Inputs |
Use Scenario: Guards ADSL/VDSL line drivers and receivers against lightning-induced surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: First-stage protection device mounted at connector entry point before filtering and conditioning stages. Use Value: 193 V clamping voltage preserves integrity of ±12 V analog front-end circuitry while meeting ITU-T K.21 basic protection level. | Use Scenario: Safeguards low-noise analog sensor inputs (ECG, SpO₂) from electrostatic discharge during clinical handling. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA at 120 V) TVS placed directly at connector pins to minimize noise coupling. Use Value: Maintains signal fidelity with <1 pF junction capacitance at zero bias, avoiding distortion of sub-mV physiological signals. |
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 | Lower PPPM (600 W), same VWM (120 V), SOD-123FL package | Not rated for AEC-Q101; limited to consumer/industrial use | Select when space-constrained layouts require smaller footprint and lower surge energy suffices |
| SMCJ120AHE3/I | Unidirectional variant; identical VWM, VBR, VC, and PPPM but polarity-sensitive | Requires correct orientation during placement; unsuitable for AC or differential lines | Choose only for DC-biased rails where polarity is fixed and cost is prioritized over flexibility |
Compared with SMCJ120CAHM3/I, SAC120CA offers reduced surge capacity in a smaller package but lacks automotive qualification, while SMCJ120AHE3/I provides identical electrical specs in unidirectional form-requiring careful polarity alignment and excluding bidirectional signal paths.
Availability
SMCJ120CAHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial communication interfaces, and telecom infrastructure requiring stable component supply with long-term lifecycle assurance.
Supply support for SMCJ120CAHM3/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 SMCJ series targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom systems demanding AEC-Q101 validation and robust 10/1000 µs surge immunity.
FAQ
What is the clamping voltage of SMCJ120CAHM3/I at its rated peak pulse current?
The SMCJ120CAHM3/I has a maximum clamping voltage (VC) of 193 V at 7.8 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured across the device terminals during full-rated surge event and defines the upper voltage limit imposed on protected circuitry. The SMCJ120CAHM3/I maintains this clamping performance symmetrically in both directions due to its bidirectional construction.
Is SMCJ120CAHM3/I qualified for automotive applications?
Yes, SMCJ120CAHM3/I is AEC-Q101 qualified, as confirmed by the HM3 suffix and documentation in Vishay's SMCJ5.0A–SMCJ188CA datasheet (Rev. 09-Jan-2024). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD, making SMCJ120CAHM3/I suitable for under-hood and body electronics in passenger vehicles and commercial vehicles.
What does the "HM3" suffix indicate in SMCJ120CAHM3/I?
The "HM3" suffix in SMCJ120CAHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information, HM3 indicates compliance with JEDEC JS709E and EU RoHS Directive 2011/65/EU, plus automotive reliability validation-distinct from M3 (halogen-free, commercial grade) and HE3 (RoHS-compliant, AEC-Q101) variants.
Can SMCJ120CAHM3/I be used in place of a unidirectional TVS like SMCJ120AHE3/I?
No-SMCJ120CAHM3/I is bidirectional and cannot replace unidirectional SMCJ120AHE3/I in DC-biased applications without circuit redesign. While both share identical VWM (120 V), VBR (133–147 V), and VC (193 V), the unidirectional part requires correct cathode orientation and blocks forward conduction. Using SMCJ120CAHM3/I in such a role may cause unintended conduction during normal operation.
What is the thermal resistance specification for SMCJ120CAHM3/I?
The SMCJ120CAHM3/I has a typical thermal resistance of 15 °C/W from junction to lead (RθJL) and 75 °C/W from junction to ambient air (RθJA) when mounted on minimum recommended pad layout. These values enable effective heat dissipation during repetitive surge events and inform PCB copper pour design-especially critical in high-density automotive modules where ambient temperatures exceed 100 °C.
SMCJ120CAHM3/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:
- 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):
- 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/I FAQ
1.How can I place an order for SMCJ120CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120CAHM3/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/I reliable?
The price and inventory of SMCJ120CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMCJ120CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120CAHM3/I?
SMCJ120CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120CAHM3/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/I?
For technical support, including SMCJ120CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120CAHM3/I requirements.
6.How does Aetrix verify that SMCJ120CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ120CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMCJ120CAHM3/I?
All SMCJ120CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMCJ120CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120CAHM3/I Tags
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