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Vishay General Semiconductor - Diodes Division SMCJ120AHE3/57T
- Part No.:
- SMCJ120AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120AHE3/57T.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,650
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Product details
Overview
SMCJ120AHE3/57T 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 against inductive switching transients and lightning-induced surges in automotive and industrial power systems.
For engineers reviewing the SMCJ120AHE3/57T datasheet, SMCJ120AHE3/57T pinout, SMCJ120AHE3/57T application, or SMCJ120AHE3/57T equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 1500 W 10/1000 μs surge capability, 120 V stand-off voltage, and SMC package thermal performance with RθJA = 75 °C/W.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below 120 V reverse stand-off voltage (VWM) and rapidly transitions to low-impedance conduction above its 133–147 V breakdown range (VBR at 1 mA), limiting transient voltages to ≤193 V at 7.8 A. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ns).
Designed for PCB-level protection of DC power rails and signal paths, it meets MSL Level 1 per J-STD-020, supports 260 °C lead-free reflow, and delivers 200 A non-repetitive forward surge current capability (IFSM) - critical for automotive load-dump immunity and industrial motor drive interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 133 V / 147 V at 1 mA - Confirmed breakdown threshold defining turn-on precision |
| VC @ IPPM | 193 V at 7.8 A - Clamped voltage during 10/1000 μs surge, directly limiting downstream stress |
| PPPM | 1500 W - Peak pulse power handling capacity under standardized surge waveform |
| IFSM | 200 A - Single half-sine surge current rating (8.3 ms), supporting automotive load-dump compliance |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood and industrial enclosures |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient on standard 8 mm × 8 mm copper pads |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection point for unidirectional clamping | Connected to protected line; conducts surge current to ground when voltage exceeds VBR |
| Anode | Low-side reference terminal | Typically tied to system ground or common return path; completes clamping loop during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 μA) across -55 °C to +150 °C operating range |
| 1500 W 10/1000 μs surge rating | Provides robust protection against ISO 7637-2 Pulse 5a/b (load dump) and IEC 61000-4-5 surges |
| MSL Level 1 moisture sensitivity | Enables standard SMT assembly without dry-pack or baking requirements |
| RoHS-compliant & halogen-free option available | Meets environmental compliance for global automotive and industrial supply chains |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Interface |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs and body control modules from load-dump transients up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges before they reach LDOs and microcontrollers. Use Value: Limits peak voltage to ≤193 V during 200 A load-dump events, preventing latch-up or gate oxide damage in downstream silicon. | Use Scenario: Shielding gate drivers and feedback sensors in variable-frequency drives from inductive kickback during IGBT switching. IC Role / Device Role / Timing Role: Mounted across DC bus or signal inputs to absorb µs-scale switching spikes induced by motor winding inductance. Use Value: Fast <1 ns response and 1500 W rating suppress >1 kV transients without degradation, preserving PWM timing integrity. |
| Telecom DC Power Input Stage | Automotive Sensor Signal Line Protection |
Use Scenario: Safeguarding PoE-powered base stations and remote radio units against lightning-induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converters, sized to handle IEC 61000-4-5 Combination Wave (10/700 µs) Use Value: 120 V VWM allows full utilization of 48 V nominal rail headroom while clamping to 193 V - within safe margin of 200 V-rated input capacitors. | Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) in engine compartments. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed inline with signal traces to shunt ESD and coupled noise to ground. Use Value: Sub-μA leakage at 120 V ensures no signal distortion on high-impedance sensor nodes; AEC-Q101 qualification guarantees long-term stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120AHE3/52T | Lower PPPM (600 W), same VWM/VC, SMB package (smaller footprint, higher RθJA) | Suitable only for lower-energy transients; not recommended for load-dump or IEC 61000-4-5 compliance | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD only. |
| SMCJ120CAHE3/57T | Bidirectional variant; identical VWM, VBR, and PPPM, but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal may occur | Choose for RS-485, CAN FD, or differential sensor interfaces needing bidirectional protection. |
Compared with SMCJ120AHE3/57T, SMBJ120AHE3/52T offers space savings at the cost of 60% lower surge energy handling, while SMCJ120CAHE3/57T provides polarity-agnostic clamping essential for differential or AC-biased circuits - neither is pin-compatible due to differing polarity marking and functional directionality.
Availability
SMCJ120AHE3/57T is available at Aetrix Electronics and suitable for automotive electronics, industrial motor controls, telecom power supplies, and sensor interface designs requiring stable component supply and AEC-Q101 assurance.
Supply support for SMCJ120AHE3/57T 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, efficiency, and application-specific validation.
The SMCJ series is engineered for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where sustained surge immunity and long-term parametric stability are mandatory.
FAQ
What is the clamping voltage of SMCJ120AHE3/57T at its rated peak pulse current?
The SMCJ120AHE3/57T has a maximum clamping voltage (VC) of 193 V when subjected to its specified peak pulse current (IPPM) of 7.8 A under a 10/1000 μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ120AHE3/57T maintains this clamping performance across its full operating temperature range.
Is SMCJ120AHE3/57T qualified for automotive applications?
Yes, SMCJ120AHE3/57T carries AEC-Q101 qualification, confirming its suitability for automotive use cases including engine control units, body electronics, and ADAS sensor interfaces. The "HE3" suffix explicitly denotes RoHS-compliant and AEC-Q101-qualified construction. This qualification covers stress tests such as temperature cycling, highly accelerated life testing (HALT), and mechanical shock - all verified per the SMCJ120AHE3/57T's certified test report.
What is the thermal resistance of SMCJ120AHE3/57T, and how does it affect PCB layout?
The SMCJ120AHE3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes standard FR-4 board material and no internal plane layers. To maintain safe junction temperatures during repeated surges, designers must provide adequate copper area and avoid excessive trace length between the SMCJ120AHE3/57T and ground planes.
How does the unidirectional configuration of SMCJ120AHE3/57T impact its placement in a circuit?
The unidirectional configuration of SMCJ120AHE3/57T requires correct orientation: the banded end (cathode) connects to the line being protected, and the anode connects to ground. This arrangement enables clamping only during positive transients relative to ground - making it ideal for DC power rails and single-ended signals. Reversing the SMCJ120AHE3/57T will prevent proper surge conduction and may cause catastrophic failure under overvoltage conditions.
What packaging format is used for SMCJ120AHE3/57T, and what does the "57T" suffix indicate?
The SMCJ120AHE3/57T is supplied in 7-inch diameter plastic tape and reel packaging, with 850 units per reel - denoted by the "57T" suffix. This format supports automated SMT placement and complies with EIA-481 standards. The "HE3" portion confirms RoHS compliance and AEC-Q101 qualification, while the base "SMCJ120A" identifies the 120 V stand-off, unidirectional TVS family. No additional moisture barrier bagging is required due to its MSL Level 1 rating.
SMCJ120AHE3/57T 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ120AHE3/57T FAQ
1.How can I place an order for SMCJ120AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120AHE3/57T 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 SMCJ120AHE3/57T reliable?
The price and inventory of SMCJ120AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120AHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ120AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120AHE3/57T?
SMCJ120AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120AHE3/57T 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 SMCJ120AHE3/57T?
For technical support, including SMCJ120AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120AHE3/57T requirements.
6.How does Aetrix verify that SMCJ120AHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ120AHE3/57T 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 SMCJ120AHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ120AHE3/57T?
All SMCJ120AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120AHE3/57T, 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 SMCJ120AHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ120AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120AHE3/57T Tags
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