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Vishay General Semiconductor - Diodes Division SMCJ120AHM3_A/H
- Part No.:
- SMCJ120AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120AHM3_A/H.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,625
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Product details
Overview
SMCJ120AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 120 V standoff voltage (VWM), 133–147 V breakdown voltage (VBR), and 193 V clamping voltage (VC) at 7.8 A peak pulse current (IPPM). It delivers 1500 W peak pulse power (10/1000 µs waveform) and supports automotive-grade reliability via AEC-Q101 qualification.
For engineers reviewing the SMCJ120AHM3_A/H datasheet, SMCJ120AHM3_A/H pinout, SMCJ120AHM3_A/H application, or SMCJ120AHM3_A/H equivalent, key selection criteria include its 120 V stand-off rating, low clamping ratio (VC/VWM ≈ 1.61), halogen-free RoHS-compliant construction (HM3 suffix), and suitability for protecting DC power rails and signal lines in harsh environments.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at VWM), but triggers into low-impedance conduction when transient voltage exceeds VBR, diverting surge current away from downstream ICs. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns).
The device is rated for 150 °C maximum junction temperature and features a thermal resistance of 75 °C/W (junction-to-ambient) on standard 8 mm × 8 mm copper pads. Its unidirectional polarity (cathode band marked) enables use on positive-rail protection without reverse-bias concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - Maximum continuous reverse voltage before significant leakage; defines operating rail margin. |
| VBR (Breakdown Voltage) | 133–147 V at 1 mA - Voltage at which device enters avalanche conduction; tight tolerance ensures predictable triggering. |
| VC (Clamping Voltage) | 193 V at IPPM = 7.8 A - Maximum voltage seen by protected circuit during 10/1000 µs surge; determines safe overvoltage headroom. |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capacity for standardized 10/1000 µs transients; enables robust IEC 61000-4-5 Level 4 compliance. |
| ID (Reverse Leakage) | 1.0 µA max at VWM - Minimal standby current draw; critical for low-power sensor or battery-backed circuits. |
| TJ max. | 150 °C - Enables operation in under-hood automotive or industrial enclosures without derating. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated placement. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads; cathode indicated by band on one end. Meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes shunt path during transient event. |
| Cathode | High-side connection point | Connected to protected line (e.g., +12 V rail); polarity marking ensures correct orientation in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensors; supports 15-year field life under thermal cycling. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations without compromising surge performance or solderability (J-STD-002 compliant). |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ≈ 1.37) and higher energy absorption per unit volume versus legacy TVS families. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking; reduces manufacturing complexity. |
| Glass passivated junction | Ensures stable VBR over time and temperature; eliminates parameter drift due to moisture ingress or contamination. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in engine control modules against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between power rail and ground, triggered within nanoseconds to clamp voltage spikes. Use Value: Limits rail voltage to ≤193 V during 1500 W surges, preventing damage to microcontrollers and CAN transceivers. |
Use Scenario: Safeguarding analog outputs (4–20 mA) and digital I/O (RS-485) of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional-capable protection element (used unidirectionally here) across signal and return paths. Use Value: Maintains signal integrity by suppressing ESD (IEC 61000-4-2 ±8 kV contact) and EFT (IEC 61000-4-4 ±2 kV) without loading the 100 kΩ sensor output impedance. |
| Telecom DC Feeder Protection | Consumer Power Adapter Output Clamping |
Use Scenario: Securing -48 V DC power feeds in base station remote radio units exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-rail, cathode-to-ground to handle negative-going transients on negative rails. Use Value: Withstands repeated 10/1000 µs surges up to 1500 W while maintaining <1 µA leakage at -48 V, minimizing standby power loss. |
Use Scenario: Clamping output overvoltage in 12 V/24 V wall adapters during feedback loop failure or rectifier short. IC Role / Device Role / Timing Role: Final-stage overvoltage limiter placed after secondary-side rectification and filtering. Use Value: Activates at 133 V breakdown to prevent >193 V from reaching USB-PD or PoE-powered devices, meeting UL 62368-1 fault safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120AHE3_A/H | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VBR range. | Suitable only for lower-energy threats (IEC 61000-4-2 ESD, not IEC 61000-4-5 surge). | Select when board space is constrained and surge energy is limited to ≤400 W. |
| SMCJ120AHE3_A/H | Same electrical specs and SMC package, but RoHS-compliant commercial grade (E3) instead of halogen-free (HM3). | Lacks halogen-free certification; not acceptable for automotive OEMs requiring material declarations. | Choose for cost-sensitive industrial designs where halogen-free compliance is not mandated. |
Compared with SMCJ120AHM3_A/H, SMAJ120AHE3_A/H trades surge robustness for compactness, while SMCJ120AHE3_A/H retains identical protection performance but omits halogen-free assurance-making the HM3 variant essential for Tier 1 automotive supply chains.
Availability
SMCJ120AHM3_A/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom DC feeder safeguarding, and consumer power adapter output clamping requiring stable component supply across multi-year production cycles.
Supply support for SMCJ120AHM3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMCJ series was developed to deliver high-power transient suppression in automotive and industrial environments, combining AEC-Q101 qualification, halogen-free materials, and industry-standard SMC packaging for drop-in replacement capability.
FAQ
What is the clamping voltage of SMCJ120AHM3_A/H at its rated peak pulse current?
The SMCJ120AHM3_A/H has a maximum clamping voltage (VC) of 193 V when subjected to its rated peak pulse current (IPPM) of 7.8 A under the standard 10/1000 µs waveform. This value is measured at the device terminals with specified mounting conditions (0.31" × 0.31" copper pads), and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ120AHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMCJ120AHM3_A/H suitable for bidirectional transient protection?
No, SMCJ120AHM3_A/H is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, Vishay offers the SMCJ120CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities. Using SMCJ120AHM3_A/H in reverse-biased configurations risks permanent damage due to forward conduction beyond its 200 A IFSM rating. Always verify polarity alignment in PCB layout for the SMCJ120AHM3_A/H.
Does SMCJ120AHM3_A/H meet automotive qualification standards?
Yes, SMCJ120AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3_X" (where "X" denotes revision A/H). This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing-validating suitability for under-hood and chassis-mounted automotive electronics. The SMCJ120AHM3_A/H data sheet explicitly references AEC-Q101 compliance in its mechanical data section.
What is the thermal resistance of SMCJ120AHM3_A/H, and how does it affect power dissipation?
The SMCJ120AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended pad layout (0.31" × 0.31" copper pads). At ambient temperatures above 25 °C, its 6.5 W steady-state power dissipation (PD) must be derated linearly-e.g., at 50 °C TA, PD drops to ~4.9 W. This RθJA value directly impacts thermal design margins in enclosed or high-temperature environments where the SMCJ120AHM3_A/H operates continuously near its TJ max. of 150 °C.
How does the HM3 suffix differentiate SMCJ120AHM3_A/H from other SMCJ120A variants?
The "HM3" suffix in SMCJ120AHM3_A/H indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification-distinguishing it from "E3" (RoHS-compliant commercial grade) and "HE3" (RoHS + AEC-Q101, but not halogen-free) variants. HM3 meets strict material content requirements for automotive OEMs and export markets, verified via IEC 61249-2-21 testing. All SMCJ120AHM3_A/H units carry this designation, ensuring consistent compliance across production lots.
SMCJ120AHM3_A/H 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:
- 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_A/H FAQ
1.How can I place an order for SMCJ120AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120AHM3_A/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 SMCJ120AHM3_A/H reliable?
The price and inventory of SMCJ120AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ120AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120AHM3_A/H?
SMCJ120AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120AHM3_A/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 SMCJ120AHM3_A/H?
For technical support, including SMCJ120AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120AHM3_A/H requirements.
6.How does Aetrix verify that SMCJ120AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ120AHM3_A/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 SMCJ120AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ120AHM3_A/H?
All SMCJ120AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120AHM3_A/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 SMCJ120AHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ120AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120AHM3_A/H Tags
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