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Vishay General Semiconductor - Diodes Division SMCJ120AHE3_A/I
- Part No.:
- SMCJ120AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120AHE3_A/I.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,431
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Product details
Overview
SMCJ120AHE3_A/I 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 SMCJ120AHE3_A/I datasheet, SMCJ120AHE3_A/I pinout, SMCJ120AHE3_A/I application, or SMCJ120AHE3_A/I equivalent, key selection criteria include clamping performance under 10/1000 µs transients, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, and AEC-Q101 qualification status for automotive electronics protection.
Technical Context
This TVS diode operates as a fast-acting shunt protector, clamping transient overvoltages above its breakdown threshold while maintaining low leakage (<1.0 µA at VWM = 120 V) and exhibiting a temperature coefficient of VBR at +0.108 %/°C. Its glass-passivated junction ensures stable avalanche behavior and long-term reliability under repetitive surge stress.
Designed for PCB-level protection of DC power rails and signal lines, the SMCJ120AHE3_A/I leverages the SMC package's low-profile form factor and matte tin-plated leads compliant with J-STD-002 solderability standards. It meets MSL Level 1 per J-STD-020 and supports peak forward surge current up to 200 A (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 133 V / 147 V at IT = 1.0 mA - Confirmed avalanche onset range for reliable overvoltage triggering |
| VC @ IPPM | 193 V at 7.8 A - Clamped voltage during 10/1000 µs surge, defining maximum stress on protected circuitry |
| PPPM | 1500 W - Peak transient energy absorption capability under standardized surge waveform |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient, critical for derating above TA = 25 °C |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| AEC-Q101 | Qualified - Validated for automotive electronic systems per stress test requirements |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads; cathode indicated by band on body; RoHS-compliant and halogen-free (HE3 suffix); MSL Level 1, 260 °C reflow compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection in reverse-biased protection configuration | Connected to protected line; conducts when transient exceeds VBR, shunting current to ground |
| Anode (unbanded end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane to complete clamping path |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power rating | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V/48 V industrial and automotive rails |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, body control, and ADAS subsystems requiring extended temperature and lifetime validation |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., load dump, inductive switching) |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter stability under thermal cycling and humidity stress |
| MSL Level 1 rating | Permits standard SMT reflow without moisture sensitivity concerns or baking requirements |
Applications
| Automotive Power Rail Protection | Industrial DC Power Input |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs against load dump transients (ISO 16750-2) and jump-start spikes. IC Role / Device Role / Timing Role: Shunt TVS device placed between power rail and chassis ground to clamp surges within safe limits. Use Value: Limits peak voltage to ≤193 V during 10/1000 µs events, preventing damage to downstream regulators and microcontrollers. | Use Scenario: Safeguarding programmable logic controllers (PLCs) and motor drives from inductive kickback on 48 V auxiliary supplies. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input stage, coordinated with upstream fuses and filters. Use Value: Absorbs up to 1500 W transient energy without degradation, ensuring system uptime in factory automation environments. |
| Telecom Line Interface | Sensor Signal Line Protection |
Use Scenario: Shielding RS-485 transceivers and PoE-powered equipment from lightning-induced surges on outdoor data lines. IC Role / Device Role / Timing Role: Secondary-level TVS on power and signal pairs, downstream of gas discharge tubes or PTCs. Use Value: Fast response (<1 ps) and low clamping voltage preserve signal integrity while meeting ITU-T K.20/21 immunity requirements. | Use Scenario: Securing analog outputs of pressure/temperature sensors in engine compartments exposed to EMI and alternator noise. IC Role / Device Role / Timing Role: Point-of-entry protection on sensor supply and output lines before signal conditioning circuitry. Use Value: Leakage <1.0 µA at 120 V prevents loading of high-impedance sensor circuits during normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120AHE3_A/I | Lower PPPM (600 W), same VWM/VBR/VC, SMB (DO-214AA) package - 30% smaller footprint, higher RθJA (110 °C/W) | Better suited for space-constrained consumer or telecom boards where surge severity is moderate | Select when board area is limited and peak surge energy does not exceed 600 W |
| SMCJ120CAHE3_A/I | Bidirectional variant; identical VWM/VBR/VC ratings but symmetric conduction in both polarities | Required for AC-coupled or floating signal lines (e.g., CAN bus, audio inputs) where polarity reversal occurs | Choose only when bidirectional clamping is mandated by signal architecture |
Compared with SMCJ120AHE3_A/I, SMBJ120AHE3_A/I trades surge capacity for compactness, while SMCJ120CAHE3_A/I adds polarity symmetry at no clamping performance cost-selection depends strictly on layout constraints and signal polarity requirements.
Availability
SMCJ120AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and telecom infrastructure requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMCJ120AHE3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and communications systems where robustness and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMCJ120AHE3_A/I at its rated peak pulse current?
The SMCJ120AHE3_A/I 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 ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ120AHE3_A/I maintains this clamping performance across its qualified operating temperature range.
Is SMCJ120AHE3_A/I suitable for automotive applications?
Yes, SMCJ120AHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix indicating RoHS-compliant and AEC-Q101-qualified construction. It supports operating junction temperatures from –55 °C to +150 °C and is validated for reliability in engine control units, body electronics, and ADAS modules where load dump and jump-start transients occur.
How does the SMCJ120AHE3_A/I differ from the bidirectional SMCJ120CAHE3_A/I?
The SMCJ120AHE3_A/I is unidirectional, with polarity marked by a cathode band and intended for DC rail protection where current flows in one direction. In contrast, SMCJ120CAHE3_A/I is bidirectional, lacks polarity marking, and clamps transients of either polarity-making it appropriate for AC signals or floating interfaces like CAN or USB. Both share identical VWM, VBR, VC, and PPPM ratings.
What is the thermal resistance and how does it affect SMCJ120AHE3_A/I derating?
The SMCJ120AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 8.0 mm × 8.0 mm copper pad per terminal. This value directly determines power derating above 25 °C ambient: for example, at TA = 75 °C, maximum allowable continuous power drops to ~3.3 W. Derating curves are provided in Figure 2 of the Vishay datasheet 88394.
Does SMCJ120AHE3_A/I require special PCB layout considerations?
Yes - optimal performance requires minimum 8.0 mm × 8.0 mm copper pads per terminal to achieve rated PPPM and thermal performance. Short, low-inductance traces to ground are essential to minimize clamping overshoot. The cathode band must be correctly oriented toward the protected line, and the device should be placed as close as possible to the connector or IC input being protected to reduce parasitic inductance.
SMCJ120AHE3_A/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:
- 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:
- -
- 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_A/I FAQ
1.How can I place an order for SMCJ120AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120AHE3_A/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 SMCJ120AHE3_A/I reliable?
The price and inventory of SMCJ120AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ120AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120AHE3_A/I?
SMCJ120AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120AHE3_A/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 SMCJ120AHE3_A/I?
For technical support, including SMCJ120AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120AHE3_A/I requirements.
6.How does Aetrix verify that SMCJ120AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ120AHE3_A/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 SMCJ120AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ120AHE3_A/I?
All SMCJ120AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120AHE3_A/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 SMCJ120AHE3_A/I part is unused and in its original packaging.
Return procedure for SMCJ120AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120AHE3_A/I Tags
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