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Vishay General Semiconductor - Diodes Division SMCJ20HE3/9AT
- Part No.:
- SMCJ20HE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20HE3/9AT.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,430
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Product details
Overview
SMCJ20HE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 20 V standoff voltage (VWM), 22.2–24.5 V breakdown range (VBR at 1 mA), 32.4 V clamping voltage (VC) at 46.3 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive power rails, industrial sensor interfaces, and DC-DC converter input stages.
For engineers reviewing the SMCJ20HE3/9AT datasheet, SMCJ20HE3/9AT pinout, SMCJ20HE3/9AT application, or SMCJ20HE3/9AT equivalent, this AEC-Q101 qualified, RoHS-compliant TVS offers verified surge immunity per IEC 61000-4-5, low clamping ratio (VC/VBR ≈ 1.45), and MSL Level 1 moisture sensitivity - critical for high-reliability automotive and industrial PCB designs requiring stable transient suppression without derating penalties.
Technical Context
The SMCJ20HE3/9AT operates as a silicon avalanche diode with glass-passivated junction, delivering sub-nanosecond response to transients. Its unidirectional polarity enables integration into DC-biased lines where reverse conduction must be blocked, and its 1500 W PPPM rating supports repeated surge events under 8.3 ms half-sine wave (IFSM = 200 A) and 10/1000 µs combination wave stress.
Thermal performance is defined by RθJA = 75 °C/W (on 8.0 mm × 8.0 mm copper pads) and maximum junction temperature of +150 °C. The device meets J-STD-020 MSL Level 1 (peak reflow ≤ 260 °C) and JESD201 Class 2 whisker resistance, confirming suitability for lead-free SMT assembly in automotive-grade production.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line DC bias. |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during fast transients. |
| VC @ IPPM | 32.4 V at 46.3 A - Clamped voltage during 1500 W surge; defines worst-case overvoltage seen by downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 µs waveform; validates compliance with IEC 61000-4-5 Level 4. |
| IFSM | 200 A - Non-repetitive forward surge current (8.3 ms half-sine); supports inrush and load-dump survival in 12 V automotive systems. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood environments without thermal shutdown. |
| Leakage ID | 1.0 µA at 20 V - Ultra-low reverse leakage preserves battery life in always-on automotive modules. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band on body; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to system ground or low-impedance return plane; carries full surge current during clamping. |
| Cathode | Protected line connection | Connected to line being protected (e.g., 12 V rail); avalanche conduction occurs when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensors, with extended temperature cycling and humidity testing. |
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime, resisting degradation from moisture or contamination in harsh environments. |
| MSL Level 1 rating | Enables single-reflow assembly without baking; compatible with standard lead-free reflow profiles up to 260 °C peak. |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving protection margin for 3.3 V or 5 V logic interfaces downstream. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V supply lines in engine control modules against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp surges before regulation stage. Use Value: Withstands 200 A IFSM and clamps to 32.4 V, preventing damage to buck controller ICs rated for ≤ 36 V absolute maximum. | Use Scenario: Shielding 4–20 mA current loop inputs in PLC analog I/O modules from ESD and inductive switching transients. IC Role / Device Role / Timing Role: Placed across loop terminals to shunt fast transients while maintaining < 1 µA leakage at 24 V nominal. Use Value: 1.0 µA leakage at VWM avoids measurement error; 1500 W PPPM handles repetitive 1 kV/500 A surge events per IEC 61000-4-4. |
| DC-DC Converter Input Stage | Automotive Infotainment USB Power |
Use Scenario: Input protection for 24 V-to-5 V isolated flyback converters in commercial vehicle telematics units. IC Role / Device Role / Timing Role: First-line defense upstream of input capacitor and primary-side controller, absorbing energy before filtering. Use Value: 75 °C/W RθJA allows thermal design with minimal copper area; 32.4 V clamping prevents overvoltage stress on MOSFET gate drivers. | Use Scenario: Overvoltage suppression on 5 V USB VBUS lines in automotive head units exposed to hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to ground, blocking reverse current while clamping positive surges above 5.5 V. Use Value: VWM = 20 V provides ample margin above 5 V rail; AEC-Q101 qualification ensures reliability across -40 °C to +125 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC20-13-F | Same VWM (20 V), lower PPPM (600 W), TO-220AC package | Requires heatsink for >100 W surges; not surface-mountable | Select when higher thermal mass is needed and board space permits through-hole mounting. |
| SMCJ20A-E3/9AT | Identical electrical specs and DO-214AB package; differs only in qualification level (commercial vs. AEC-Q101) | No automotive qualification; not validated for temperature cycling or humidity exposure per AEC standards | Choose SMCJ20HE3/9AT for automotive OEM programs; use SMCJ20A-E3/9AT for cost-sensitive industrial prototypes. |
Compared with SAC20-13-F and SMCJ20A-E3/9AT, the SMCJ20HE3/9AT uniquely combines AEC-Q101 qualification, 1500 W surge capability, and SMT compatibility - enabling drop-in deployment in automotive ECUs without layout changes or thermal derating.
Availability
SMCJ20HE3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC-DC converter input stage surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMCJ20HE3/9AT 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, precision, and automotive-grade validation.
The SMCJ series was engineered specifically for high-energy transient suppression in automotive and industrial environments, balancing clamping performance, thermal robustness, and AEC-Q101 compliance in compact SMT packages.
FAQ
What is the clamping voltage of the SMCJ20HE3/9AT under maximum surge conditions?
The SMCJ20HE3/9AT has a maximum clamping voltage (VC) of 32.4 V at 46.3 A peak pulse current (IPPM) with 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 a 1500 W transient event. The SMCJ20HE3/9AT maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is the SMCJ20HE3/9AT suitable for automotive applications?
Yes, the SMCJ20HE3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including engine control, infotainment, and ADAS subsystems. Its qualification covers temperature cycling, humidity testing, and mechanical shock per AEC standards. The SMCJ20HE3/9AT also meets J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance, making it suitable for lead-free reflow in automotive manufacturing.
How does the SMCJ20HE3/9AT differ from the commercial-grade SMCJ20A-E3/9AT?
The SMCJ20HE3/9AT and SMCJ20A-E3/9AT share identical electrical specifications and DO-214AB packaging, but differ in qualification: SMCJ20HE3/9AT is AEC-Q101 qualified, while SMCJ20A-E3/9AT is commercial grade. The HE3 suffix indicates enhanced reliability testing for automotive environments, including extended temperature cycling and humidity exposure - critical for SMCJ20HE3/9AT deployment in OEM production.
What is the maximum reverse leakage current of the SMCJ20HE3/9AT at its standoff voltage?
The SMCJ20HE3/9AT exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 20 V standoff voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage ensures minimal power loss in always-on automotive modules and preserves accuracy in precision sensor signal paths where leakage could introduce offset errors.
Can the SMCJ20HE3/9AT be used in bi-directional protection circuits?
No, the SMCJ20HE3/9AT is a unidirectional TVS diode, indicated by the "A" suffix (not "CA"). It conducts only in reverse bias above VBR and blocks forward current - making it unsuitable for AC or bidirectional signal lines. For bi-directional protection at 20 V, the correct variant is SMCJ20CA; using SMCJ20HE3/9AT in such applications would fail to suppress positive transients on grounded references.
SMCJ20HE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 41.9A
- 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)
SMCJ20HE3/9AT FAQ
1.How can I place an order for SMCJ20HE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20HE3/9AT 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 SMCJ20HE3/9AT reliable?
The price and inventory of SMCJ20HE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20HE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ20HE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20HE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20HE3/9AT?
SMCJ20HE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20HE3/9AT 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 SMCJ20HE3/9AT?
For technical support, including SMCJ20HE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20HE3/9AT requirements.
6.How does Aetrix verify that SMCJ20HE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ20HE3/9AT 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 SMCJ20HE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ20HE3/9AT?
All SMCJ20HE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20HE3/9AT, 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 SMCJ20HE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ20HE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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