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Vishay General Semiconductor - Diodes Division SMCJ20AHE3/9AT
- Part No.:
- SMCJ20AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20AHE3/9AT.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,484
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Product details
Overview
SMCJ20AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. 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 (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ20AHE3/9AT datasheet, SMCJ20AHE3/9AT pinout, SMCJ20AHE3/9AT application, or SMCJ20AHE3/9AT equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 1500 W surge capability, low clamping ratio (VC/VBR ≈ 1.42), and compatibility with automated SMT assembly on 8 mm × 8 mm copper pads.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM (20 V) and rapidly transitions to low-impedance conduction above VBR (min 22.2 V) to limit transient overvoltages. Its glass-passivated junction ensures stable leakage (<1 μA at VWM) and fast response time (<1 ns), critical for protecting downstream MOSFETs and ICs from ESD and inductive switching spikes.
Thermally, it exhibits RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable operation up to TJ = 150 °C. The HE3 suffix confirms RoHS-compliance and AEC-Q101 qualification - required for automotive-grade power rail protection where long-term reliability under thermal cycling and humidity is mandated.
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 1 mA - defines precise turn-on threshold for transient suppression |
| VC @ IPPM | 32.4 V at 46.3 A - clamped voltage during 1500 W surge, limiting stress on protected circuitry |
| PPPM | 1500 W - peak pulse power handling with 10/1000 μs waveform, per IEC 61000-4-5 |
| Leakage ID | <1 μA at 20 V - negligible standby current, preserving battery life in always-on systems |
| TJ max | +150 °C - supports under-hood automotive environments and industrial enclosures |
| AEC-Q101 | Qualified - validated for automotive electronics per stress test requirements (HTOL, TC, HAST, etc.) |
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. Cathode marked by band; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop during transients |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail); conducts when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive power systems requiring extended temperature cycling and humidity resistance |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage across lifetime and environmental stress |
| 1500 W peak pulse rating | Withstands severe load-dump and ISO 7637-2 Pulse 5a surges without degradation |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot during clamping, reducing risk of downstream IC latch-up |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 24 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp surges before they reach DC-DC converters and microcontrollers. Use Value: Limits peak voltage to ≤32.4 V during 1500 W transients, preventing damage to 36 V-rated input stages and ensuring system-level EMC compliance. | Use Scenario: Analog output lines (e.g., 4–20 mA current loops) in factory automation sensors subjected to cable ESD and field wiring faults. IC Role / Device Role / Timing Role: TVS mounted differential across signal and return, referenced to local ground, suppressing ±15 kV contact ESD per IEC 61000-4-2. Use Value: Sub-1 ns response and <1 μA leakage preserve signal integrity and offset accuracy while surviving repeated 8/20 μs surges up to 1500 W. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drive Inputs |
Use Scenario: Central office power distribution units supplying -48 V DC to remote terminal units, vulnerable to lightning-induced surges on long feeder lines. IC Role / Device Role / Timing Role: Unidirectional TVS installed at PSE input stage to absorb longitudinal surges before they propagate into PoE controllers and PHYs. Use Value: 20 V VWM allows stable operation under nominal -48 V bias (with appropriate polarity orientation), while 32.4 V VC protects -56 V tolerant silicon. | Use Scenario: Brushless DC motor drive boards in smart appliances, where PWM switching induces dV/dt spikes on low-voltage control rails. IC Role / Device Role / Timing Role: TVS placed across gate driver supply (e.g., 12 V VDD) to suppress cross-talk and Miller-induced transients. Use Value: Fast clamping prevents false triggering of high-side drivers and avoids shoot-through conditions in half-bridge configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20AHE3/A | Lower PPPM (400 W), same VWM/VBR/VC, SMA package (smaller footprint, lower thermal mass) | Suitable for space-constrained consumer PCBs with lower surge exposure (IEC 61000-4-5 Level 2) | Select when board area is limited and surge threat level is moderate; not recommended for automotive load dump. |
| SMCJ20CAHE3/9AT | Bidirectional variant; identical VWM/VBR/VC ratings but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal may occur | Choose only when bidirectional protection is mandatory; unidirectional SMCJ20AHE3/9AT offers better leakage and lower capacitance for DC rails. |
Compared with SMAJ20AHE3/A and SMCJ20CAHE3/9AT, the SMCJ20AHE3/9AT delivers higher surge immunity (1500 W vs. 400 W) and automotive qualification - making it the preferred choice for 24 V/48 V power inputs in harsh environments where reliability outweighs size constraints.
Availability
SMCJ20AHE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor modules, telecom power feeds, and appliance motor drives requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ20AHE3/9AT 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMCJ series is engineered for high-energy transient suppression in demanding environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated through robust, AEC-Q101-qualified components.
FAQ
What is the clamping voltage of the SMCJ20AHE3/9AT under full 1500 W surge conditions?
The SMCJ20AHE3/9AT clamps to 32.4 V at its rated peak pulse current of 46.3 A (10/1000 μs waveform), corresponding to 1500 W. This value is measured per JEDEC standards and confirmed in the Vishay datasheet revision 09-Jan-2024, Document Number 88394. The clamping voltage directly determines the maximum stress imposed on downstream components during surge events, making it a critical parameter for safe margining in 24 V systems.
Is the SMCJ20AHE3/9AT suitable for automotive applications?
Yes, the SMCJ20AHE3/9AT is AEC-Q101 qualified, as indicated by the "HE3" suffix, and meets the stress test requirements for automotive electronics including high-temperature operating life, temperature cycling, and humidity testing. Its 1500 W surge rating and 150 °C maximum junction temperature make it appropriate for engine bay and chassis-mounted ECUs subject to load dump and jump-start transients - consistent with ISO 7637-2 compliance when properly applied.
What does the "9AT" suffix mean in SMCJ20AHE3/9AT?
The "9AT" suffix denotes the packaging configuration: 13-inch diameter plastic tape and reel, with a base quantity of 3500 units per reel. This format is optimized for high-volume SMT assembly lines using standard pick-and-place equipment. The "HE3" portion confirms RoHS compliance and AEC-Q101 qualification, while "SMCJ20A" identifies the electrical family (20 V stand-off, unidirectional). No functional or electrical differences exist between /9AT and /57T variants beyond packaging.
How does the SMCJ20AHE3/9AT compare to bidirectional TVS diodes like SMCJ20CAHE3/9AT?
The SMCJ20AHE3/9AT is unidirectional and optimized for DC rail protection with cathode-anode polarity, offering lower reverse leakage (<1 μA) and slightly lower junction capacitance than its bidirectional counterpart SMCJ20CAHE3/9AT. The latter provides symmetrical clamping for AC or floating signals but sacrifices leakage performance and adds complexity in polarity-sensitive layouts. For 24 V power inputs, SMCJ20AHE3/9AT is preferred unless bidirectional behavior is explicitly required.
What is the thermal resistance of the SMCJ20AHE3/9AT, and how does it affect layout design?
The SMCJ20AHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W, measured on 8.0 mm × 8.0 mm copper pads per terminal. To maintain TJ ≤ 150 °C under continuous 6.5 W dissipation, PCB layout must provide adequate copper area and minimize thermal bottlenecks. Use of internal ground/power planes and thermal vias beneath the SMC pad significantly improves heat spreading - especially critical in enclosed automotive or industrial enclosures.
SMCJ20AHE3/9AT 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:
- 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)
SMCJ20AHE3/9AT FAQ
1.How can I place an order for SMCJ20AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20AHE3/9AT 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 SMCJ20AHE3/9AT reliable?
The price and inventory of SMCJ20AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ20AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20AHE3/9AT?
SMCJ20AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20AHE3/9AT 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 SMCJ20AHE3/9AT?
For technical support, including SMCJ20AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20AHE3/9AT requirements.
6.How does Aetrix verify that SMCJ20AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ20AHE3/9AT 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 SMCJ20AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ20AHE3/9AT?
All SMCJ20AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20AHE3/9AT, 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 SMCJ20AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ20AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20AHE3/9AT Tags
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