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Vishay General Semiconductor - Diodes Division SMCJ20CAHE3/9AT
- Part No.:
- SMCJ20CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20CAHE3/9AT.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,376
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Product details
Overview
SMCJ20CAHE3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 20 V standoff voltage (VWM), 32.4 V clamping voltage (VC) at 46.3 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed on automotive sensor signal lines, industrial I/O ports, and telecom interface circuits.
For engineers reviewing the SMCJ20CAHE3/9AT datasheet, SMCJ20CAHE3/9AT pinout, SMCJ20CAHE3/9AT application, or SMCJ20CAHE3/9AT equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low incremental surge resistance, and compatibility with automated SMT assembly on 8 mm × 8 mm copper pads.
Technical Context
The SMCJ20CAHE3/9AT operates as a voltage-clamped shunt protector, responding within picoseconds to transients induced by inductive switching or ESD events. Its bidirectional architecture enables symmetrical clamping in both polarities without polarity marking, and its glass-passivated junction ensures stable breakdown behavior under repetitive surge stress.
Thermally, it delivers RθJA = 75 °C/W (typ.) and RθJL = 15 °C/W (typ.), supporting reliable operation up to TJ = +150 °C. The device meets J-STD-020 MSL Level 1 and is qualified to AEC-Q101 for automotive use - confirmed by HE3 suffix and Vishay's automotive ordering code designation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 22.2 V / 24.5 V at IT = 1 mA - guaranteed breakdown threshold range for design margining |
| VC | 32.4 V at IPPM = 46.3 A - clamped voltage during 10/1000 µs surge, defining protected IC voltage ceiling |
| PPPM | 1500 W - peak transient power handling capacity, enabling protection against ISO 7637-2 Pulse 1/2/5a |
| IPPM | 46.3 A - maximum non-repetitive surge current supported with defined clamping performance |
| TJ max | +150 °C - maximum junction temperature, allowing deployment in under-hood automotive environments |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height for high-power density layout |
Pinout & Package
SMCJ20CAHE3/9AT uses the SMC (DO-214AB) package: a two-terminal, bidirectional surface-mount device with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Acts as cathode during positive surges and anode during negative surges - symmetric conduction |
| Cathode | Transient return path (bidirectional) | Acts as anode during positive surges and cathode during negative surges - no band marking required |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| 1500 W peak pulse power | Withstands high-energy transients such as load dump (ISO 16750-2) and coupled lightning surges |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage |
| MSL Level 1 moisture sensitivity | Enables standard reflow without baking, compatible with high-volume automated SMT lines |
| Glass-passivated junction | Ensures stable VBR over time and temperature, critical for long-life industrial deployments |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) in engine compartments exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional shunt clamp that diverts surge energy away from downstream signal conditioning ICs and microcontrollers. Use Value: Maintains signal integrity below 32.4 V during 46.3 A transients, preventing reset or damage to A/D converters and communication PHYs. | Use Scenario: Safeguarding digital input/output terminals of programmable logic controllers against field-wiring induced surges and ground bounce. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed directly at connector entry points to limit transient propagation into backplane circuitry. Use Value: Enables compliance with IEC 61000-4-5 (Level 4, 4 kV) while maintaining <1 ns response time and minimal leakage (<1 µA at 20 V). |
| Telecom Interface Protection | Consumer Power Adapter Protection |
Use Scenario: Shielding Ethernet PHYs, PoE injectors, and DSL line drivers from ESD and induced surges on unshielded twisted-pair cabling. IC Role / Device Role / Timing Role: Primary-level TVS placed before common-mode chokes to absorb differential-mode transients before filtering stages. Use Value: Clamps to 32.4 V within picoseconds, preserving signal eye diagram integrity and meeting GR-1089-CORE immunity requirements. | Use Scenario: Protecting secondary-side rectifier outputs and feedback sensing nodes in AC/DC adapters against output short-circuit transients and capacitor discharge spikes. IC Role / Device Role / Timing Role: Secondary-side transient suppressor across DC output rails to prevent overvoltage shutdown or regulator latch-up. Use Value: Handles 1500 W surges without degradation, supporting UL 62368-1 transient immunity testing and 10-year reliability targets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20CAHE3/A | Lower PPPM (400 W), smaller SMA package, higher RθJA (110 °C/W) | Limited to lower-energy transients (IEC 61000-4-2 ±8 kV contact); unsuitable for ISO 7637-2 Pulse 5a | Select when board space is constrained and surge energy is ≤400 W - not a drop-in replacement |
| SMCJ20CAHM3/9AT | Halogen-free variant with identical electrical specs and AEC-Q101 qualification | No functional difference; used where RoHS-compliant halogen-free materials are mandated (e.g., EU automotive Tier 1) | Direct material substitution for green manufacturing - same footprint, thermal, and electrical behavior |
Compared with SMAJ20CAHE3/A and SMCJ20CAHM3/9AT, the SMCJ20CAHE3/9AT uniquely balances 1500 W surge capacity, AEC-Q101 validation, and commercial-grade RoHS compliance in the SMC package - making it optimal for high-reliability automotive and industrial designs requiring proven surge robustness without halogen restrictions.
Availability
SMCJ20CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom Ethernet PHY protection requiring stable component supply and full traceability.
Supply support for SMCJ20CAHE3/9AT 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom systems demanding AEC-Q101 validation and 1500 W surge resilience.
FAQ
What is the clamping voltage of the SMCJ20CAHE3/9AT at its rated peak pulse current?
The SMCJ20CAHE3/9AT has a maximum clamping voltage (VC) of 32.4 V at its rated peak pulse current (IPPM) of 46.3 A using a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is measured per ANSI/IEEE C62.35 standards. The SMCJ20CAHE3/9AT maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is the SMCJ20CAHE3/9AT suitable for automotive applications?
Yes, the SMCJ20CAHE3/9AT is AEC-Q101 qualified and explicitly designated for automotive use via its HE3 suffix and Vishay's automotive ordering code structure. It supports under-hood and cabin applications including engine control units, ADAS camera modules, and body electronics - validated for temperature cycling, humidity, and mechanical shock per AEC-Q101 test conditions. The SMCJ20CAHE3/9AT also meets J-STD-020 MSL Level 1 for reflow compatibility.
How does the bidirectional configuration of the SMCJ20CAHE3/9AT affect PCB layout?
The SMCJ20CAHE3/9AT has no polarity marking and operates identically in both directions, eliminating orientation constraints during placement. Unlike unidirectional TVS diodes, it requires no cathode band alignment - simplifying automated pick-and-place and reducing assembly errors. Its SMC (DO-214AB) footprint remains unchanged, but designers must ensure symmetric trace routing to avoid impedance imbalance in differential lines. The SMCJ20CAHE3/9AT is optimized for mounting on 8.0 mm × 8.0 mm copper pads per terminal to achieve specified thermal and surge ratings.
What is the maximum reverse leakage current of the SMCJ20CAHE3/9AT at its standoff voltage?
The SMCJ20CAHE3/9AT exhibits a maximum reverse leakage current (ID) of 1.0 µA at its standoff voltage (VWM) of 20 V and ambient temperature of 25 °C. This low leakage ensures minimal power loss in always-on circuits and avoids false triggering in high-impedance sensor interfaces. Leakage remains below 5 µA up to 80 % of VWM, supporting precision analog front-end protection without signal distortion. The SMCJ20CAHE3/9AT achieves this performance via glass-passivated junction technology.
Does the SMCJ20CAHE3/9AT require heatsinking for continuous operation?
No external heatsink is required for the SMCJ20CAHE3/9AT under normal standby conditions, as its power dissipation rating (PD) is 6.5 W at TA = 50 °C with infinite heatsink assumptions. In typical PCB layouts using minimum recommended 8.0 mm × 8.0 mm copper pads per terminal, thermal resistance is RθJA = 75 °C/W (typ.), allowing safe operation at full rated power without forced cooling. However, sustained surge duty cycles above 0.1 Hz may necessitate additional copper area or thermal vias - verified per the derating curve in Figure 2 of the SMCJ20CAHE3/9AT datasheet.
SMCJ20CAHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ20CAHE3/9AT FAQ
1.How can I place an order for SMCJ20CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20CAHE3/9AT 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 SMCJ20CAHE3/9AT reliable?
The price and inventory of SMCJ20CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ20CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20CAHE3/9AT?
SMCJ20CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20CAHE3/9AT 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 SMCJ20CAHE3/9AT?
For technical support, including SMCJ20CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20CAHE3/9AT requirements.
6.How does Aetrix verify that SMCJ20CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ20CAHE3/9AT 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 SMCJ20CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ20CAHE3/9AT?
All SMCJ20CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20CAHE3/9AT, 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 SMCJ20CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ20CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20CAHE3/9AT Tags
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