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Vishay General Semiconductor - Diodes Division SMCJ120AHM3/I
- Part No.:
- SMCJ120AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120AHM3/I.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,830
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Product details
Overview
SMCJ120AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 120 V standoff voltage (VWM), 133–147 V breakdown range (VBR at 1 mA), 193 V maximum clamping voltage (VC) at 7.8 A peak pulse current, and 1500 W peak pulse power rating with a 10/1000 µs waveform - deployed in automotive power distribution modules, industrial motor drives, and telecom DC power inputs.
For engineers reviewing the SMCJ120AHM3/I datasheet, SMCJ120AHM3/I pinout, SMCJ120AHM3/I application, or SMCJ120AHM3/I equivalent, this page delivers verified electrical specs, package dimensions, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, and real-world protection use cases - all aligned to Vishay Document #88394 (Rev. 09-Jan-2024).
Technical Context
The SMCJ120AHM3/I operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast response (<1 ps) to ESD and lightning-induced transients. Its clamping action begins at VBR ≥133 V and limits line voltage to ≤193 V under 7.8 A IPPM, maintaining low incremental surge resistance and stable performance across -55 °C to +150 °C junction temperature.
Designed for surface-mount implementation in SMC (DO-214AB) package, it supports automated placement and meets J-STD-020 MSL Level 1 (260 °C peak reflow). The HM3 suffix confirms halogen-free, RoHS-compliant construction with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC/AC line hold-off capability. |
| VBR (min/max) | 133 V / 147 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above normal operating voltage with margin. |
| VC @ IPPM | 193 V at 7.8 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure level. |
| PPPM | 1500 W - Peak pulse power handling capacity; enables suppression of high-energy transients without failure. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| RθJA | 75 °C/W - Thermal resistance junction-to-ambient on standard 8 mm × 8 mm copper pads; informs derating requirements for sustained surge duty. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with UL 94 V-0 flammability rating; cathode indicated by band on body; terminals are matte tin-plated leads compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point (unidirectional forward conduction) | Connected to protected line side; conducts during forward surge events (e.g., reverse polarity misconnection). |
| Cathode | Current exit point / clamping reference node | Connected to ground or low-impedance return path; defines clamping reference and enables reverse-biased TVS operation. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Withstands high-energy transients (e.g., ISO 7637-2 Pulse 5a) without degradation when mounted on 8 mm × 8 mm copper pads. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, body electronics, and ADAS power rails. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for downstream MOSFETs and ICs. |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; compatible with standard SMT assembly processes up to 260 °C peak reflow. |
| Halogen-free & RoHS-compliant (HM3) | Fulfills environmental compliance requirements for global automotive and industrial OEM supply chains. |
Applications
| Automotive Power Distribution | Industrial Motor Drive DC Bus |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ground to clamp surges up to ±150 V. Use Value: Limits voltage seen by MCU power supplies and CAN transceivers to ≤193 V, preventing latch-up or gate oxide damage. |
Use Scenario: Safeguarding IGBT gate drivers and bus voltage monitors in variable-frequency drives exposed to inductive switching spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS on DC link to absorb commutation energy and suppress ringing. Use Value: Clamps 10/1000 µs surges to 193 V while dissipating 1500 W, avoiding overvoltage shutdown or component failure. |
| Telecom DC Power Input | Consumer Appliance Control Board |
|
Use Scenario: Shielding PoE-powered equipment front-end from lightning-induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary-level TVS on input filter stage, upstream of DC/DC converters. Use Value: Responds in <1 ps to divert >7 A transient current, preserving converter ICs rated for ≤200 V absolute max. |
Use Scenario: Guarding microcontroller reset lines and sensor interfaces in washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA at 120 V) unidirectional suppressor on 5 V/3.3 V rails. Use Value: Maintains system stability during ESD events (IEC 61000-4-2 ±8 kV contact) without false resets or data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120A-E3/57T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VC ratings. | Not suitable for high-energy automotive load dump; limited to low-power signal or secondary-side protection. | Select only where space constraints outweigh surge energy requirements and ambient temperature remains <70 °C. |
| SMCJ120AHE3_A/I | Same electrical specs and SMC package, but RoHS-compliant commercial grade (not AEC-Q101 qualified); E3 suffix instead of HM3. | Lacks automotive qualification; not approved for under-hood or safety-critical vehicle systems. | Use in non-automotive industrial or consumer designs where halogen-free requirement is absent and AEC validation is unnecessary. |
Compared with SMCJ120AHM3/I, SMAJ120A-E3/57T trades surge capacity for size, while SMCJ120AHE3_A/I retains identical protection performance but omits AEC-Q101 validation and halogen-free compliance - making SMCJ120AHM3/I the sole choice for production automotive applications requiring both qualifications.
Availability
SMCJ120AHM3/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive DC bus protection, and telecom DC power input applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMCJ120AHM3/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, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMCJ series was developed for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness, AEC-Q101 compliance, and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of the SMCJ120AHM3/I under maximum surge conditions?
The SMCJ120AHM3/I clamps to a maximum of 193 V when subjected to its rated 7.8 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay Document #88394, ensuring predictable overvoltage limiting for downstream components like MCUs and gate drivers in the SMCJ120AHM3/I design.
Is the SMCJ120AHM3/I suitable for automotive applications?
Yes - the SMCJ120AHM3/I carries the HM3 suffix, indicating halogen-free, RoHS-compliant construction and full AEC-Q101 qualification per Vishay's automotive test plan. It is explicitly rated for under-hood and chassis-mounted use in vehicles, supporting ISO 7637-2 load dump and ISO 16750-2 supply voltage variation requirements in SMCJ120AHM3/I deployments.
What does the "HM3" suffix mean in SMCJ120AHM3/I?
The "HM3" suffix denotes halogen-free, RoHS-compliant materials and AEC-Q101 qualification - distinguishing it from commercial-grade variants like SMCJ120A-E3. This marking confirms compliance with automotive environmental standards and reliability validation, directly impacting SMCJ120AHM3/I suitability for Tier 1 OEM programs and long-lifecycle industrial designs.
How does the SMCJ120AHM3/I compare to bidirectional TVS diodes like SMCJ120CA?
The SMCJ120AHM3/I is unidirectional and intended for DC circuits with defined polarity (e.g., battery feeds), offering lower leakage and tighter VBR tolerance than bidirectional types. In contrast, SMCJ120CA protects AC or polarity-agnostic lines but exhibits higher ID at VWM; thus, SMCJ120AHM3/I is preferred where reverse leakage must stay ≤1 µA and clamping precision is critical in the SMCJ120AHM3/I application context.
What PCB layout guidance applies to the SMCJ120AHM3/I for optimal thermal performance?
Vishay specifies mounting the SMCJ120AHM3/I on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve the rated RθJA of 75 °C/W. Reducing pad area increases thermal resistance, derating power dissipation - so SMCJ120AHM3/I layouts must maintain these dimensions to sustain 1500 W surge capability and avoid junction overheating during repetitive transients.
SMCJ120AHM3/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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ120AHM3/I FAQ
1.How can I place an order for SMCJ120AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120AHM3/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 SMCJ120AHM3/I reliable?
The price and inventory of SMCJ120AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120AHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ120AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120AHM3/I?
SMCJ120AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120AHM3/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 SMCJ120AHM3/I?
For technical support, including SMCJ120AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120AHM3/I requirements.
6.How does Aetrix verify that SMCJ120AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ120AHM3/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 SMCJ120AHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ120AHM3/I?
All SMCJ120AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120AHM3/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 SMCJ120AHM3/I part is unused and in its original packaging.
Return procedure for SMCJ120AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120AHM3/I Tags
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