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Vishay General Semiconductor - Diodes Division SMCJ20HE3/57T
- Part No.:
- SMCJ20HE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20HE3/57T.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,526
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Product details
Overview
SMCJ20HE3/57T 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 stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (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 - ideal for automotive power line and industrial I/O port surge protection.
For engineers reviewing the SMCJ20HE3/57T datasheet, SMCJ20HE3/57T pinout, SMCJ20HE3/57T application, or SMCJ20HE3/57T equivalent, key selection criteria include clamping performance under 8.3 ms surge, AEC-Q101 qualification for automotive use, RoHS compliance with JESD 201 Class 2 whisker resistance, and thermal derating behavior above 25 °C ambient.
Technical Context
The SMCJ20HE3/57T operates as a unidirectional avalanche diode, leveraging glass-passivated silicon junction technology to achieve sub-nanosecond response to transients. Its clamping action begins at VBR ≥ 22.2 V and limits voltage to ≤ 32.4 V during 10/1000 µs surges up to 46.3 A, with low incremental surge resistance ensuring minimal overshoot.
Thermally, it exhibits RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable operation up to TJ = 150 °C. The device is rated for 200 A non-repetitive forward surge (8.3 ms half-sine) and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe working margin below clamping threshold |
| VBR min/max | 22.2 V / 24.5 V at IT = 1 mA - guaranteed avalanche onset range; ensures predictable turn-on across temperature and lot variation |
| VC @ IPPM | 32.4 V at 46.3 A - clamped voltage during 10/1000 µs surge; directly determines protected circuit's maximum stress level |
| PPPM | 1500 W - peak pulse power handling capability; validates immunity to IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges |
| TJ max | +150 °C - maximum junction temperature; supports under-hood automotive placement with appropriate PCB copper area |
| IFSM | 200 A - single half-sine surge rating (8.3 ms); qualifies for load-dump and alternator-switching event protection |
| Qualification | AEC-Q101 qualified - certified for automotive electronic systems requiring high reliability and stress test compliance |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (non-banded end) | Connects to lower-potential side of protected line; conducts during forward surge events like load dump |
| Cathode | Avalanche clamping terminal (banded end) | Connects to higher-potential side (e.g., +12 V rail); initiates clamping when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - enables direct use in ADAS and body control modules |
| Glass-passivated junction | Stable VBR and low leakage over lifetime; eliminates risk of moisture-induced degradation in humid environments |
| MSL Level 1 rating | Compatible with standard SMT reflow profiles up to 260 °C peak - no baking required prior to assembly |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth under thermal cycling and long-term storage - critical for safety-critical automotive applications |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a), improving system-level EMI resilience |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V power rails in engine control units (ECUs) against load dump and alternator switching transients per ISO 16750-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and downstream DC/DC converter input stage. Use Value: Clamps 1500 W surges to ≤32.4 V, preventing damage to 36 V-rated input capacitors and LDO regulators in ECUs. |
Use Scenario: Safeguarding analog sensor signal lines (e.g., pressure, temperature) in factory automation PLC I/O modules exposed to relay coil flyback. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode grounded) used on differential sensor pairs referenced to chassis ground. Use Value: Sub-1 ns response and 32.4 V clamping prevent latch-up in precision op-amps and ADC front-ends during 400 V/2 Ω transients. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding PoE-powered network switches from induced lightning surges on 48 V DC input derived from AC/DC adapters. IC Role / Device Role / Timing Role: Primary unidirectional TVS on main DC bus upstream of hot-swap controllers and PMICs. Use Value: 200 A IFSM rating handles repetitive 8.3 ms surges without degradation; 1500 W PPPM meets IEC 61000-4-5 Ed.3 requirements. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, washing machines). IC Role / Device Role / Timing Role: TVS mounted across motor terminals with anode tied to motor negative and cathode to positive rail. Use Value: 32.4 V clamping prevents MOSFET drain-source breakdown during 100 V+ inductive kickback, extending FET lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/52T | Lower PPPM (400 W), smaller SMA package (DO-214AC), VBR 22.2–24.5 V same, but lower IPPM (12.3 A) | Suitable only for low-energy transients (IEC 61000-4-2 ESD, not IEC 61000-4-5 surge) | Select when board space is constrained and surge energy is < 100 mJ; not AEC-Q101 qualified |
| SMCJ20AHE3/57T | Identical electrical specs and AEC-Q101 qualification; differs only in marking code (no "H" suffix in part number but same HE3/57T packaging) | No functional difference; both meet same automotive reliability and thermal specs | Direct form-fit-function replacement; verify marking and reel labeling per OEM procurement requirement |
Compared with SMAJ20A-E3/52T, the SMCJ20HE3/57T delivers 3.75× higher surge power handling and automotive qualification; versus SMCJ20AHE3/57T, it is functionally identical - the "H" denotes internal Vishay manufacturing traceability, not performance deviation.
Availability
SMCJ20HE3/57T is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply and full AEC-Q101 compliance.
Supply support for SMCJ20HE3/57T 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMCJ series was engineered specifically for high-energy transient suppression in harsh environments, emphasizing AEC-Q101 qualification, low clamping voltage, and robust thermal performance in surface-mount packages.
FAQ
What is the clamping voltage of the SMCJ20HE3/57T under a 10/1000 µs surge?
The SMCJ20HE3/57T has a maximum clamping voltage (VC) of 32.4 V at 46.3 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during standardized surge events. The SMCJ20HE3/57T maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is the SMCJ20HE3/57T qualified for automotive applications?
Yes, the SMCJ20HE3/57T is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature reverse bias, temperature cycling, and ESD verification required for automotive electronic systems. Its DO-214AB package, JESD 201 Class 2 whisker resistance, and MSL Level 1 reflow compatibility make it suitable for under-hood and cabin ECU designs where reliability is mission-critical. The SMCJ20HE3/57T is explicitly listed in Vishay's AEC-Q101 qualified devices table.
What does the "HE3/57T" suffix mean in SMCJ20HE3/57T?
The "HE3" suffix indicates RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance; "57T" specifies packaging in 7-inch plastic tape-and-reel format with 850 units per reel. This distinguishes it from commercial-grade "E3/57T" variants lacking automotive qualification. The SMCJ20HE3/57T is manufactured to Vishay's automotive-grade process controls and traceability standards - a key differentiator from standard SMCJ20A-E3/57T parts.
Can the SMCJ20HE3/57T be used in bidirectional protection circuits?
No - the SMCJ20HE3/57T is a unidirectional TVS diode, intended for protection of DC lines with defined polarity (e.g., +12 V power rails). For bidirectional applications such as AC signal lines or data buses, Vishay's SMCJ20CA series (e.g., SMCJ20CAHE3/57T) must be used instead. Using the unidirectional SMCJ20HE3/57T in reverse-biased AC configurations risks catastrophic failure due to forward conduction during negative half-cycles.
What is the thermal resistance of the SMCJ20HE3/57T, and how does it affect layout?
The SMCJ20HE3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain TJ ≤ 150 °C under 6.5 W steady-state dissipation, PCB layout must provide adequate copper area and minimize trace length to thermal vias. The SMCJ20HE3/57T's thermal performance directly impacts its ability to survive repetitive surge events without parametric drift.
SMCJ20HE3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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)
SMCJ20HE3/57T FAQ
1.How can I place an order for SMCJ20HE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20HE3/57T 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 SMCJ20HE3/57T reliable?
The price and inventory of SMCJ20HE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20HE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ20HE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20HE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20HE3/57T?
SMCJ20HE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20HE3/57T 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 SMCJ20HE3/57T?
For technical support, including SMCJ20HE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20HE3/57T requirements.
6.How does Aetrix verify that SMCJ20HE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ20HE3/57T 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 SMCJ20HE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ20HE3/57T?
All SMCJ20HE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20HE3/57T, 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 SMCJ20HE3/57T part is unused and in its original packaging.
Return procedure for SMCJ20HE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20HE3/57T Tags
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