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Vishay General Semiconductor - Diodes Division SMCJ33AHE3/9AT
- Part No.:
- SMCJ33AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33AHE3/9AT.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,002
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Product details
Overview
SMCJ33AHE3/9AT from Vishay General Semiconductor is a unidirectional 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 33 V stand-off voltage (VWM), 53.3 V maximum clamping voltage at 28.1 A peak pulse current (10/1000 µs), and 1500 W peak pulse power dissipation - ideal for automotive electronics and industrial power supply input stages.
For engineers reviewing the SMCJ33AHE3/9AT datasheet, SMCJ33AHE3/9AT pinout, SMCJ33AHE3/9AT application, or SMCJ33AHE3/9AT equivalent, key selection criteria include clamping performance under 10/1000 µs surge, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 36.7–40.6 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable leakage (<1.0 µA at 33 V) and fast response (<1 ns), enabling protection against ESD, inductive switching spikes, and lightning-induced transients.
Designed for surface-mount use on PCBs with minimum recommended pad layout, it delivers 1500 W surge capability per JEDEC-standard 10/1000 µs waveform while maintaining low incremental surge resistance and meeting MSL Level 1 (260 °C reflow peak). The HE3 suffix confirms RoHS compliance and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - Ensures reliable turn-on margin above VWM with defined tolerance |
| VC @ IPPM | 53.3 V at 28.1 A - Clamped voltage during 1500 W surge protects downstream ICs rated ≤50 V |
| IPPM | 28.1 A - Peak surge current handling capacity under standardized 10/1000 µs waveform |
| PPPM | 1500 W - Surge power rating defining transient energy absorption capability |
| TJ max | +150 °C - Junction temperature limit supporting operation in under-hood automotive environments |
| RθJA | 75 °C/W - Thermal resistance indicating need for adequate copper pour for sustained power dissipation |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity marked by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in unidirectional configuration | Connected to ground or return path; carries full surge current during clamping |
| Cathode | High-side connection (marked with band) | Connected to protected line; reverse-biased during normal operation, avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power supplies |
| 1500 W peak pulse power | Withstands high-energy transients from load dump or inductive kick without degradation |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on protected devices during surge events |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking or special handling |
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and leakage current over temperature and life |
Applications
| Automotive Power Input Protection | Industrial DC Power Rail Clamp |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against ISO 7637-2 load dump pulses and alternator overshoot. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor. Use Value: Clamps transients to ≤53.3 V, preventing damage to 36 V-rated regulators and microcontrollers. | Use Scenario: Safeguarding PLC I/O module power inputs exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input stage before DC/DC converter. Use Value: Absorbs up to 1500 W surges without failure, maintaining system uptime in harsh factory environments. |
| Telecom Line Interface Protection | Consumer Power Adapter Output Clamp |
Use Scenario: Shielding Ethernet PHY power pins from ESD and induced surges on PoE-powered equipment. IC Role / Device Role / Timing Role: Secondary protection device after common-mode choke, across VDD/GND. Use Value: Sub-1 ns response time limits voltage overshoot to safe levels for 3.3 V/5 V PHY ICs. | Use Scenario: Preventing output overvoltage in wall-mounted AC/DC adapters due to feedback loop failure. IC Role / Device Role / Timing Role: Shunt clamp on regulated 5 V or 12 V output rail. Use Value: Limits fault voltage to 53.3 V, avoiding catastrophic failure of connected USB peripherals or displays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33AHE3/A | Lower PPPM (400 W), smaller SMA package, same VWM/VC specs | Not suitable for 1500 W surge requirements; limited to low-energy ESD-only scenarios | Select only when board space is constrained and surge energy is ≤400 W |
| SMCJ33CAHE3/9AT | Bidirectional variant; symmetric VBR and clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal occurs | Choose for RS-485, CAN, or sensor bridge circuits needing bidirectional protection |
Compared with SMAJ33AHE3/A and SMCJ33CAHE3/9AT, the SMCJ33AHE3/9AT uniquely balances high-energy 1500 W clamping, AEC-Q101 qualification, and unidirectional efficiency - making it optimal for automotive and industrial DC power rail protection where surge magnitude and reliability are critical.
Availability
SMCJ33AHE3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and telecom infrastructure requiring stable component supply with AEC-Q101 validation and 1500 W surge immunity.
Supply support for SMCJ33AHE3/9AT 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 automotive, industrial, and communications systems where robustness and repeatable clamping behavior are mandatory.
FAQ
What is the clamping voltage of SMCJ33AHE3/9AT at its rated peak pulse current?
The SMCJ33AHE3/9AT has a maximum clamping voltage (VC) of 53.3 V at its rated peak pulse current (IPPM) of 28.1 A, measured under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated surge event, ensuring compatibility with 36 V–50 V rated downstream components. The SMCJ33AHE3/9AT maintains this clamping performance across its specified operating temperature range.
Is SMCJ33AHE3/9AT qualified for automotive applications?
Yes, the SMCJ33AHE3/9AT carries the HE3 suffix, which denotes RoHS compliance and AEC-Q101 qualification per Vishay's ordering nomenclature. This certification validates its reliability for automotive use cases including engine control modules, body electronics, and ADAS power supplies. The SMCJ33AHE3/9AT meets stress tests for temperature cycling, humidity, mechanical shock, and surge endurance required by AEC-Q101.
What is the package type and mounting requirement for SMCJ33AHE3/9AT?
The SMCJ33AHE3/9AT uses the SMC (DO-214AB) surface-mount package, with dimensions of 7.75 mm × 6.22 mm × 2.62 mm. It requires mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated thermal and surge performance. The SMCJ33AHE3/9AT is compatible with standard reflow profiles (MSL Level 1, peak 260 °C) and supports automated pick-and-place assembly.
How does the breakdown voltage range of SMCJ33AHE3/9AT compare to its stand-off voltage?
The SMCJ33AHE3/9AT has a minimum breakdown voltage (VBR) of 36.7 V and a maximum of 40.6 V at 1 mA test current, while its stand-off voltage (VWM) is 33 V. This 3.7–7.6 V margin ensures the device remains non-conductive during normal operation yet triggers reliably before protected circuitry reaches hazardous voltage levels. The SMCJ33AHE3/9AT's VBR/VWM ratio (~1.11–1.23) reflects optimized design for stable, repeatable clamping.
Can SMCJ33AHE3/9AT be used in bidirectional signal protection applications?
No - the SMCJ33AHE3/9AT is a unidirectional TVS diode, intended for DC rail protection where polarity is fixed. For bidirectional applications such as AC lines, differential data buses (e.g., RS-485), or floating sensors, the bidirectional variant SMCJ33CAHE3/9AT must be used instead. Using the SMCJ33AHE3/9AT in reverse-biased AC conditions would result in forward conduction and potential failure. Always verify polarity alignment before integrating the SMCJ33AHE3/9AT.
SMCJ33AHE3/9AT 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 28.1A
- 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)
SMCJ33AHE3/9AT FAQ
1.How can I place an order for SMCJ33AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33AHE3/9AT 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 SMCJ33AHE3/9AT reliable?
The price and inventory of SMCJ33AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ33AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33AHE3/9AT?
SMCJ33AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33AHE3/9AT 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 SMCJ33AHE3/9AT?
For technical support, including SMCJ33AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33AHE3/9AT requirements.
6.How does Aetrix verify that SMCJ33AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ33AHE3/9AT 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 SMCJ33AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ33AHE3/9AT?
All SMCJ33AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33AHE3/9AT, 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 SMCJ33AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ33AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33AHE3/9AT Tags
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