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Vishay General Semiconductor - Diodes Division SMCJ20AHE3/57T
- Part No.:
- SMCJ20AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20AHE3/57T.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,036
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Product details
Overview
SMCJ20AHE3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with 32.4 V maximum clamping voltage at 46.3 A peak pulse current, 20 V stand-off voltage, and 22.2–24.5 V breakdown voltage range - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power rails.
For engineers reviewing the SMCJ20AHE3/57T datasheet, SMCJ20AHE3/57T pinout, SMCJ20AHE3/57T application, or SMCJ20AHE3/57T equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 1500 W 10/1000 µs surge rating, low incremental surge resistance, and RoHS-compliant matte tin-plated leads suitable for automated placement on PCBs with 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ20AHE3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering fast response time (<1 ns) and low clamping ratio (VC/VBR ≈ 1.45) under 10/1000 µs surge conditions. Its thermal resistance is 75 °C/W junction-to-ambient and 15 °C/W junction-to-lead, enabling reliable operation up to 150 °C junction temperature.
Designed for unidirectional transient suppression, it features cathode-band polarity marking, meets MSL Level 1 per J-STD-020, and supports peak forward surge current of 200 A (8.3 ms half-sine). The device is rated for ≤1.0 µA reverse leakage at 20 V stand-off voltage and exhibits +0.094 %/°C temperature coefficient of breakdown voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - sustains high-energy transients without failure in automotive load-dump or inductive-switching events |
| Stand-off Voltage (VWM) | 20 V - maximum continuous reverse operating voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 22.2–24.5 V at 1.0 mA - defines the onset of avalanche conduction under controlled test conditions |
| Clamping Voltage (VC) | 32.4 V at 46.3 A IPPM - maximum voltage seen by protected circuit during full-rated surge |
| Peak Pulse Current (IPPM) | 46.3 A - peak surge current capability under standardized 10/1000 µs waveform |
| Junction Temperature Range | −55 °C to +150 °C - enables deployment in under-hood automotive and industrial environments |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
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 on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point in reverse-biased protection configuration | Connected to protected line (e.g., 24 V rail); clamps positive transients to ground when voltage exceeds VBR |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping path during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| Low incremental surge resistance | Enables tighter clamping (VC − VBR = 10.2 V) and lower let-through energy during surge events |
| Glass passivated chip junction | Ensures stable long-term performance and reduced parameter drift under thermal cycling and humidity stress |
| MSL Level 1 rating | Allows unlimited floor life and reflow compatibility up to 260 °C peak without baking preconditioning |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body electronics, and ADAS modules requiring zero-defect reliability |
| RoHS-compliant & halogen-free option available | Meets global environmental compliance mandates while maintaining identical electrical performance and thermal behavior |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppresses load-dump transients (up to 40 V, 100 ms) on 24 V battery-fed ECUs in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp positive surges before reaching downstream regulators and microcontrollers. Use Value: Limits voltage seen by protected ICs to ≤32.4 V during 1500 W surge, preventing latch-up or gate oxide damage in 24 V systems. |
Use Scenario: Shields analog output lines (e.g., 4–20 mA current loop) from ESD and inductive kickback in factory automation sensors. IC Role / Device Role / Timing Role: Placed across signal and return lines to divert fast transients (<1 ns rise time) away from precision ADC inputs. Use Value: Maintains signal integrity with <1.0 µA leakage at 20 V, ensuring minimal offset error in millivolt-level measurements. |
| DC Motor Drive Board Protection | Telecom Power Interface Protection |
Use Scenario: Guards H-bridge MOSFET gates and bootstrap circuits against flyback voltage spikes during PWM switching of 24 V DC motors. IC Role / Device Role / Timing Role: Mounted directly at motor driver IC power pins to minimize inductance in clamping path. Use Value: Withstands 200 A non-repetitive forward surge (8.3 ms), protecting gate drivers from destructive inductive energy. |
Use Scenario: Protects PoE-powered equipment front-end from lightning-induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: First-stage clamping device upstream of DC-DC converter, sized for 1500 W IEC 61000-4-5 compliance. Use Value: Achieves 32.4 V clamping at 46.3 A, allowing downstream TVS or crowbar circuits to handle residual energy safely. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/61 | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Suitable for lower-energy transients; limited to ≤85 °C ambient without derating | Select when board space is constrained and surge energy does not exceed 400 W |
| SMCJ20CAHE3/57T | Bidirectional variant; same VWM (20 V), symmetric clamping in both polarities; no cathode marking | Required for AC-coupled or dual-polarity signal lines where negative transients must also be suppressed | Choose only if bidirectional protection is mandated - not a drop-in replacement due to polarity and marking differences |
Compared with SMAJ20A-E3/61, the SMCJ20AHE3/57T delivers 275 % higher surge power handling and superior thermal dissipation; versus SMCJ20CAHE3/57T, it provides optimized unidirectional clamping with lower leakage and defined cathode orientation for DC rail use.
Availability
SMCJ20AHE3/57T is available at Aetrix Electronics and suitable for automotive ECU design, industrial motor control, telecom power interface, and sensor module development requiring stable component supply and AEC-Q101 traceability.
Supply support for SMCJ20AHE3/57T 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 optimization.
The SMCJ series targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom infrastructure where robustness against load dump, ESD, and lightning surges is critical.
FAQ
What is the clamping voltage of the SMCJ20AHE3/57T at its rated peak pulse current?
The SMCJ20AHE3/57T has a maximum clamping voltage (VC) of 32.4 V at its rated peak pulse current (IPPM) of 46.3 A under the standard 10/1000 µs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal and represents the upper limit of voltage imposed on the protected circuit during full-rated surge conditions. The SMCJ20AHE3/57T maintains this clamping performance across its qualified operating temperature range.
Is the SMCJ20AHE3/57T suitable for automotive applications?
Yes, the SMCJ20AHE3/57T is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix, confirming validation for temperature cycling, highly accelerated life testing, and ESD robustness per automotive reliability standards. It is commonly deployed in 24 V power distribution modules, body control units, and ADAS sensor interfaces where load-dump immunity and long-term stability are required. The SMCJ20AHE3/57T meets these requirements without derating at junction temperatures up to 150 °C.
How does the SMCJ20AHE3/57T differ from the bidirectional SMCJ20CAHE3/57T?
The SMCJ20AHE3/57T is unidirectional with cathode-band marking and suppresses only positive transients relative to ground, whereas the SMCJ20CAHE3/57T is bidirectional with no polarity marking and clamps transients of either polarity. Their breakdown voltages differ: SMCJ20AHE3/57T specifies 22.2–24.5 V (unidirectional), while SMCJ20CAHE3/57T specifies symmetric 22.2–24.5 V in both directions. The SMCJ20AHE3/57T exhibits lower reverse leakage (≤1.0 µA at 20 V) than the bidirectional version (≤2.0 µA), making it preferable for DC rail protection.
What is the thermal resistance of the SMCJ20AHE3/57T, and how does it affect layout?
The SMCJ20AHE3/57T 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 the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads. This means that for 6.5 W steady-state power dissipation, the junction temperature rises ~488 °C above ambient - but since the device is intended for transient (not continuous) operation, layout focuses on minimizing inductance in the clamping path rather than heatsinking. The SMCJ20AHE3/57T achieves optimal surge performance only when pad geometry matches the datasheet specification.
Does the SMCJ20AHE3/57T require special handling or moisture sensitivity precautions?
No - the SMCJ20AHE3/57T is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can withstand peak reflow temperatures up to 260 °C without baking or dry-pack requirements. Its molding compound meets UL 94 V-0 flammability rating, and the matte tin-plated leads comply with J-STD-002 solderability standards. These characteristics simplify manufacturing integration and eliminate moisture-related yield loss. The SMCJ20AHE3/57T is supplied in 7" tape-and-reel (57T) packaging compatible with high-speed pick-and-place equipment.
SMCJ20AHE3/57T 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 46.3A
- 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)
SMCJ20AHE3/57T FAQ
1.How can I place an order for SMCJ20AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20AHE3/57T 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 SMCJ20AHE3/57T reliable?
The price and inventory of SMCJ20AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20AHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ20AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20AHE3/57T?
SMCJ20AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20AHE3/57T 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 SMCJ20AHE3/57T?
For technical support, including SMCJ20AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20AHE3/57T requirements.
6.How does Aetrix verify that SMCJ20AHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ20AHE3/57T 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 SMCJ20AHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ20AHE3/57T?
All SMCJ20AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20AHE3/57T, 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 SMCJ20AHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ20AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20AHE3/57T Tags
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