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Vishay General Semiconductor - Diodes Division SMCJ33A-E3/51T
- Part No.:
- SMCJ33A-E3/51T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33A-E3/51T.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,054
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Product details
Overview
SMCJ33A-E3/51T 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 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), 53.3 V clamping voltage at 28.1 A peak surge current, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMCJ33A-E3/51T datasheet, SMCJ33A-E3/51T pinout, SMCJ33A-E3/51T application, or SMCJ33A-E3/51T equivalent, key selection criteria include clamping performance under 10/1000 µs transients, junction temperature derating above 25 °C, unidirectional polarity marking (cathode band), and compliance with UL 497B and JESD201 Class 1A whisker testing.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transient overvoltages induced by inductive switching or ESD events. Its glass-passivated junction ensures stable leakage (<1.0 µA at 33 V) and low incremental surge resistance, enabling precise clamping at 53.3 V under 28.1 A IPPM.
Thermal design relies on its RθJA of 75 °C/W and RθJL of 15 °C/W, with maximum junction temperature rated at +150 °C. Derating curves confirm usable pulse power down to ~50% at TA = 100 °C when mounted on 8.0 mm × 8.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on margin above VWM |
| VC @ IPPM | 53.3 V at 28.1 A - Clamping voltage during 10/1000 µs surge, limiting downstream voltage stress |
| PPPM | 1500 W - Peak pulse power handling capability under standardized transient waveform |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| AEC-Q101 | Qualified - Validated for automotive electronic systems per stress test requirements |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (uni-directional) | Connected to protected line; conducts only when cathode is > anode by ≥VBR |
| Cathode | Forward current exit / clamping reference | Marked with band; ties to ground or lower-potential rail to shunt transients |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| JESD201 Class 1A whisker resistance | Prevents tin whisker growth in high-reliability applications over extended service life |
| UL 497B recognition (QVGQ2) | Validates suitability for telecom and industrial signal-line protection per safety standards |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load-dump transients up to ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Shunt clamping device placed between power rail and chassis ground. Use Value: Limits voltage to ≤53.3 V during 1500 W surges, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in PLC I/O modules exposed to field wiring noise. IC Role / Device Role / Timing Role: Bidirectional-capable protection on signal lines referenced to local ground. Use Value: Sub-µA leakage at 33 V avoids loading high-impedance sensor bridges; fast response preserves signal fidelity. |
| Telecom DSL Line Protection | Consumer Power Adapter Input Stage |
Use Scenario: Guarding ADSL/VDSL line drivers against lightning-induced surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Primary shunt protector on differential pair inputs, coordinated with gas discharge tubes. Use Value: UL 497B recognition supports regulatory compliance; 53.3 V clamping aligns with ITU-T K.20/21 immunity thresholds. | Use Scenario: Secondary-side overvoltage clamp in AC/DC adapters after rectification, before bulk capacitor. IC Role / Device Role / Timing Role: Unidirectional TVS across DC output to absorb switching spikes and residual transients. Use Value: 1500 W rating handles repetitive flyback energy; RoHS-compliant E3 suffix meets global environmental mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Lower PPPM (400 W), smaller DO-214AC (SMA) package, same VWM/VBR range | Suitable for space-constrained consumer PCBs where surge energy is <400 W | Select SMCJ33A-E3/51T when 1500 W surge immunity is required; SMAJ33A-E3/57T fits tighter layouts but offers reduced robustness. |
| SMCJ33CA-E3/51T | Bi-directional version; identical VWM/VBR/PPPM but symmetrical clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal occurs | Choose SMCJ33A-E3/51T for DC rails with defined polarity; use SMCJ33CA-E3/51T only if bidirectional clamping is mandatory. |
Compared with SMAJ33A-E3/57T, the SMCJ33A-E3/51T delivers 3.75× higher surge power handling in a larger but thermally superior package; versus SMCJ33CA-E3/51T, it provides optimized unidirectional clamping with lower leakage and no need for symmetrical protection.
Availability
SMCJ33A-E3/51T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface, and telecom line protection requiring stable component supply across extended production lifecycles.
Supply support for SMCJ33A-E3/51T 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 automotive qualification.
The SMCJ series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-energy transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of the SMCJ33A-E3/51T under a 10/1000 µs surge?
The SMCJ33A-E3/51T clamps to a maximum of 53.3 V when subjected to its rated peak pulse current of 28.1 A under the standardized 10/1000 µs waveform. This value is measured at the device terminals and defines the upper voltage limit imposed on protected circuitry during transient events. The SMCJ33A-E3/51T maintains this clamping performance across its specified operating temperature range.
Is the SMCJ33A-E3/51T suitable for automotive applications?
Yes, the SMCJ33A-E3/51T is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junctions, MSL Level 1 moisture sensitivity, and JESD201 Class 1A whisker resistance - all validated for under-hood and ECU environments. The SMCJ33A-E3/51T meets ISO 7637-2 Pulse 5a load-dump immunity requirements when properly mounted.
How does the SMCJ33A-E3/51T differ from the bi-directional SMCJ33CA-E3/51T?
The SMCJ33A-E3/51T is unidirectional with cathode-band polarity marking and ≤1.0 µA leakage at 33 V, while the SMCJ33CA-E3/51T is bi-directional with no polarity marking and symmetric clamping in both directions. Both share identical VWM, VBR, PPPM, and package, but the SMCJ33A-E3/51T offers lower leakage and is intended for DC-biased lines where polarity is fixed.
What is the thermal resistance of the SMCJ33A-E3/51T?
The SMCJ33A-E3/51T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W, measured on the recommended 8.0 mm × 8.0 mm copper pad layout. These values enable accurate thermal modeling for board-level power dissipation and derating calculations, especially critical in high-temperature automotive or industrial deployments of the SMCJ33A-E3/51T.
Does the SMCJ33A-E3/51T meet RoHS and halogen-free requirements?
Yes, the SMCJ33A-E3/51T carries the E3 suffix, confirming full RoHS compliance per Directive 2011/65/EU and halogen-free status per JEDEC JS709A. Its molding compound meets UL 94 V-0 flammability rating, and matte tin-plated leads comply with J-STD-002 solderability standards - all verified and documented for the SMCJ33A-E3/51T by Vishay.
SMCJ33A-E3/51T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ33A-E3/51T FAQ
1.How can I place an order for SMCJ33A-E3/51T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33A-E3/51T 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 SMCJ33A-E3/51T reliable?
The price and inventory of SMCJ33A-E3/51T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33A-E3/51T is usually 5 days.
3.What payment methods are accepted for SMCJ33A-E3/51T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33A-E3/51T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33A-E3/51T?
SMCJ33A-E3/51T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33A-E3/51T 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 SMCJ33A-E3/51T?
For technical support, including SMCJ33A-E3/51T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33A-E3/51T requirements.
6.How does Aetrix verify that SMCJ33A-E3/51T is sourced from the original manufacturer or authorized distributors?
All SMCJ33A-E3/51T 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 SMCJ33A-E3/51T meets industry standards.
7.What is the process for return or replacement of SMCJ33A-E3/51T?
All SMCJ33A-E3/51T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33A-E3/51T, 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 SMCJ33A-E3/51T part is unused and in its original packaging.
Return procedure for SMCJ33A-E3/51T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33A-E3/51T Tags
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