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Vishay General Semiconductor - Diodes Division SMCJ120AHM3/H
- Part No.:
- SMCJ120AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120AHM3/H.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,345
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Product details
Overview
SMCJ120AHM3/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, 193 V clamping voltage at 7.8 A peak pulse current, and 1500 W peak pulse power rating. It protects MOSFETs, ICs, and sensor signal lines in automotive power systems and industrial control interfaces.
For engineers reviewing the SMCJ120AHM3/H datasheet, SMCJ120AHM3/H pinout, SMCJ120AHM3/H application, or SMCJ120AHM3/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, 1500 W 10/1000 µs surge capability, and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This TVS diode operates as a voltage-clamping device triggered by transient overvoltage events exceeding its 120 V reverse standoff voltage (VWM), entering avalanche breakdown to clamp line voltage to ≤193 V within picoseconds. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM).
Designed for automated SMT assembly, it meets MSL Level 1 per J-STD-020 with 260 °C peak reflow tolerance and features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. The cathode band identifies polarity on unidirectional variants like SMCJ120AHM3/H.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping activation |
| VBR min/max | 133 V / 147 V - Breakdown voltage range at 1 mA test current, defining reliable turn-on threshold |
| VC @ IPPM | 193 V - Clamped voltage during 7.8 A 10/1000 µs surge, limiting downstream stress |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 µs waveform, enabling robust surge immunity |
| ID @ VWM | ≤1.0 µA - Reverse leakage current at rated standoff voltage, minimizing standby power loss |
| TJ max | +150 °C - Maximum junction temperature, supporting operation in under-hood automotive environments |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and thermal pad compatibility |
Pinout & Package
SMCJ120AHM3/H uses the SMC (DO-214AB) package: a surface-mount, molded plastic case with two coplanar terminals, 7.75 mm × 6.22 mm body size, 2.06 mm height, and cathode band marking on the unidirectional variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection in reverse-biased protection configuration | Connected to protected line; conducts avalanche current to ground when transient exceeds VWM |
| Anode (non-banded end) | Reference/ground return path | Typically tied to system ground plane; completes clamping current path during surge events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock per JESD22 standards |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU |
| Low incremental surge resistance | Enables tighter clamping (193 V at 7.8 A) versus higher-resistance alternatives, reducing voltage overshoot |
| Very fast response time | Sub-nanosecond turn-on ensures protection of sensitive CMOS inputs before damage occurs |
| MSL Level 1 rating | Allows unlimited floor life and single reflow at 260 °C peak, simplifying manufacturing logistics |
Applications
| Automotive Power Distribution | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump transients up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges induced by alternator regulation failure. Use Value: Limits voltage seen by downstream DC-DC converters to ≤193 V, preventing overvoltage latch-up or gate oxide rupture. | Use Scenario: Safeguarding PLC analog input modules from inductive kickback during solenoid switching. IC Role / Device Role / Timing Role: Standoff-rated TVS on signal conditioning front-end to absorb 1500 W energy spikes without degradation. Use Value: Maintains ≤1.0 µA leakage at 120 V, preserving measurement accuracy while surviving repeated 10/1000 µs surges. |
| Telecom Line Interface Protection | Onboard Charger DC Link Monitoring |
Use Scenario: Shielding RS-485 transceivers in base station backhaul equipment from lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on differential bus lines, coordinated with GDT secondary protection. Use Value: Fast sub-ns response prevents data corruption during EFT bursts; 193 V clamping preserves transceiver common-mode range. | Use Scenario: Securing voltage sense circuitry monitoring 400 V DC link in EV onboard chargers during switching transitions. IC Role / Device Role / Timing Role: High-VWM TVS on isolated feedback path to suppress coupling noise from SiC MOSFET switching edges. Use Value: 120 V standoff enables use with resistive divider networks; 1500 W rating handles repetitive dv/dt-induced transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120AHM3 | Lower PPPM (600 W), smaller SMB package (DO-214AA), same VWM/VBR/VC specs | Reduced surge margin; suitable only for lower-energy transients or space-constrained layouts | Select when board area is critical and worst-case surge energy is ≤600 W |
| SMCJ120AHE3 | Same electrical specs but RoHS-compliant commercial grade (E3), not AEC-Q101 qualified or halogen-free | Lacks automotive qualification and halogen-free certification; limited to non-automotive industrial use | Select for cost-sensitive non-automotive designs where AEC-Q101 and halogen-free requirements do not apply |
Compared with SMCJ120AHM3/H, SMBJ120AHM3 offers identical voltage ratings but reduced surge capacity and smaller footprint, while SMCJ120AHE3 matches performance but omits automotive qualification and halogen-free materials-making SMCJ120AHM3/H the sole choice for AEC-Q101–mandated, environmentally compliant automotive power protection.
Availability
SMCJ120AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial motor controls, and telecom infrastructure requiring stable component supply with full traceability and lifecycle management.
Supply support for SMCJ120AHM3/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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, 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 qualification, high PPPM, and robust thermal performance.
FAQ
What is the clamping voltage of the SMCJ120AHM3/H under maximum surge conditions?
The SMCJ120AHM3/H clamps to 193 V when subjected to its rated 7.8 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value is measured at the device terminals under specified test conditions and defines the upper voltage limit imposed on protected circuits during transient events.
Is the SMCJ120AHM3/H suitable for automotive applications?
Yes, the SMCJ120AHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction. It is explicitly intended for automotive power distribution, body control modules, and ADAS subsystems where reliability under temperature cycling and surge stress is mandatory.
How does the SMCJ120AHM3/H differ from the SMCJ120AHE3 variant?
The SMCJ120AHM3/H adds AEC-Q101 qualification and halogen-free materials versus the SMCJ120AHE3, which is RoHS-compliant but commercial-grade only. Both share identical electrical parameters (VWM = 120 V, VC = 193 V), but SMCJ120AHM3/H supports automotive deployment where SMCJ120AHE3 does not.
What is the thermal resistance of the SMCJ120AHM3/H from junction to ambient?
The typical thermal resistance from junction to ambient (RθJA) for the SMCJ120AHM3/H is 75 °C/W when mounted on the minimum recommended copper pad layout (0.31" × 0.31"). This value assumes no additional heatsinking and guides derating calculations for sustained power dissipation.
Does the SMCJ120AHM3/H have polarity marking, and how is it identified?
Yes, the SMCJ120AHM3/H is unidirectional and features a visible cathode band on the package body. Per Vishay documentation, the banded end is the cathode terminal and must be connected toward the protected line, while the anode (non-banded end) connects to ground or reference potential.
SMCJ120AHM3/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:
- 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/H FAQ
1.How can I place an order for SMCJ120AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120AHM3/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/H reliable?
The price and inventory of SMCJ120AHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMCJ120AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120AHM3/H?
SMCJ120AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120AHM3/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/H?
For technical support, including SMCJ120AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120AHM3/H requirements.
6.How does Aetrix verify that SMCJ120AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ120AHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMCJ120AHM3/H?
All SMCJ120AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120AHM3/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/H part is unused and in its original packaging.
Return procedure for SMCJ120AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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