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Vishay General Semiconductor - Diodes Division SMCJ33-E3/9AT
- Part No.:
- SMCJ33-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33-E3/9AT.pdf
- Description:
- TVS DIODE 33VWM 59VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,642
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Product details
Overview
SMCJ33-E3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) 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 clamping voltage (VC) at 28.1 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive ECUs, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMCJ33-E3/9AT datasheet, SMCJ33-E3/9AT pinout, SMCJ33-E3/9AT application, or SMCJ33-E3/9AT equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), RoHS-compliant packaging, and real-world protection use cases - all aligned to Vishay's official SMCJ series specification document 88394.
Technical Context
The SMCJ33-E3/9AT operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its 33 V stand-off level (VWM) and clamping transients to ≤53.3 V at rated surge current. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM).
Designed for surface-mount automated assembly on 8.0 mm × 8.0 mm copper pads, it meets J-STD-020 MSL Level 1 (260 °C peak reflow), supports 200 A non-repetitive forward surge (IFSM), and maintains operation across -55 °C to +150 °C junction temperature range.
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 1.0 mA test current - guaranteed avalanche breakdown window |
| VC @ IPPM | 53.3 V at 28.1 A - clamped voltage during 10/1000 µs surge, defining protected circuit stress |
| PPPM | 1500 W - peak transient power handling capability under standardized waveform |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, critical for derating above 25 °C |
| TJ max | +150 °C - maximum allowable junction temperature, enabling high-temperature automotive use |
| AEC-Q101 | Qualified - validated for automotive-grade reliability per stress-test requirements |
Pinout & Package
Package: DO-214AB (SMCJ), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail in unidirectional TVS configuration |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 33 V supply rail); conducts during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile DO-214AB package | Enables compact PCB layout and compatibility with standard SMT pick-and-place equipment |
| Glass-passivated junction | Ensures consistent breakdown voltage tolerance and long-term stability under thermal cycling |
| 1500 W peak pulse power | Withstands high-energy transients from inductive switching (e.g., solenoid drivers, motor controllers) |
| AEC-Q101 qualification | Validates suitability for automotive applications including engine control, body electronics, and ADAS sensors |
| MSL Level 1 rating | Allows single-reflow soldering without moisture sensitivity concerns or baking preconditioning |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 33 V battery-supplied microcontrollers and CAN transceivers in vehicle body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 33 V rail and chassis ground to clamp surges before they reach downstream ICs. Use Value: Limits transient voltage to ≤53.3 V, preserving logic-level integrity and preventing latch-up in 3.3 V/5 V peripherals powered from regulated 33 V sources. |
Use Scenario: Safeguarding analog input pins of 24–36 V industrial pressure/temperature sensors exposed to ESD and field-wiring induced transients. IC Role / Device Role / Timing Role: Standoff-clamp TVS on sensor signal lines referenced to local ground, absorbing fast-rising spikes before ADC front-end. Use Value: Maintains <1.0 µA leakage at 33 V, avoiding measurement drift while delivering sub-1 ns response to 8 kV ESD events per IEC 61000-4-2. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Protection |
Use Scenario: Shielding 33 V DC-DC converter inputs in base station remote radio units from lightning-induced surges on outdoor power feeds. IC Role / Device Role / Timing Role: Primary-stage TVS on main DC input, coordinated with upstream fusing and secondary filtering. Use Value: Absorbs 1500 W peak energy without degradation, enabling compliance with ITU-T K.20 and Telcordia GR-1089-CORE immunity requirements. |
Use Scenario: Clamping Miller-induced voltage spikes on high-side gate driver supply rails in 3-phase inverters using SiC MOSFETs. IC Role / Device Role / Timing Role: Local TVS across gate driver VDD-to-VSS, suppressing dV/dt coupling during fast switching transitions. Use Value: Fast avalanche response (<1 ns) limits overshoot to <53.3 V, preventing false turn-on and ensuring reliable gate drive timing margins. |
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-E3/61T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Suitable for space-constrained consumer electronics but insufficient for automotive load-dump duty cycles | Select only for cost-sensitive, low-energy protection where 1500 W headroom is unnecessary |
| SMCJ33AHE3/9AT | Identical electrical specs and DO-214AB package; differs only in AEC-Q101 qualification marking (HE3 suffix) | Same functional performance; HE3 variant explicitly certified for automotive use per AEC-Q101 | Choose SMCJ33AHE3/9AT when formal automotive qualification documentation is required for PPAP submission |
Compared with SMAJ33A-E3/61T, the SMCJ33-E3/9AT delivers 3.75× higher surge power handling and superior thermal dissipation; versus SMCJ33AHE3/9AT, it shares identical protection capability but lacks the explicit AEC-Q101 certification label - making it suitable for industrial or telecom applications where full automotive qualification is not mandated.
Availability
SMCJ33-E3/9AT is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, and telecom DC power inputs requiring stable component supply, traceable sourcing, and long-term lifecycle support.
Supply support for SMCJ33-E3/9AT 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, and protection devices with emphasis on reliability, precision, and automotive-grade validation.
The SMCJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where failure resilience and repeatable clamping performance are critical.
FAQ
What is the clamping voltage of the SMCJ33-E3/9AT under maximum rated surge current?
The SMCJ33-E3/9AT clamps to 53.3 V at its rated peak pulse current of 28.1 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 standards and defines the maximum voltage seen by protected circuitry during a worst-case transient event. The SMCJ33-E3/9AT maintains this clamping performance across its full operating temperature range and after repeated surge exposures, provided derating guidelines from Vishay document 88394 are followed.
Is the SMCJ33-E3/9AT RoHS compliant and lead-free?
Yes, the SMCJ33-E3/9AT is RoHS compliant and lead-free, as confirmed by the "E3" suffix in its part number and Vishay's material categorization documentation (www.vishay.com/doc?99912). Its matte tin-plated terminals meet J-STD-002 and JESD 22-B102 solderability requirements, and it passes JESD 201 Class 1A whisker testing. The device uses halogen-free molding compound compliant with JEDEC JS709A standards.
Does the SMCJ33-E3/9AT have AEC-Q101 qualification?
No, the SMCJ33-E3/9AT is not AEC-Q101 qualified; that designation applies only to variants with the "HE3" suffix (e.g., SMCJ33AHE3/9AT). The SMCJ33-E3/9AT carries commercial-grade qualification and meets MSL Level 1, glass passivation, and UL 497B recognition, but lacks the extended stress-test validation required for automotive PPAP. For AEC-Q101–mandated designs, specify the HE3 version.
What is the thermal resistance and how does it affect layout design for the SMCJ33-E3/9AT?
The SMCJ33-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This value directly impacts power derating: at 70 °C ambient, its usable power drops to ~3.5 W (vs. 6.5 W at 50 °C). To maintain reliability, PCB layout must replicate the specified pad dimensions and avoid excessive trace length or isolation - otherwise, thermal impedance rises and clamping consistency degrades during repetitive surges.
How does the SMCJ33-E3/9AT differ from bi-directional SMCJ33CA variants?
The SMCJ33-E3/9AT is unidirectional, meaning it conducts only in reverse bias above 33 V and blocks forward current like a standard diode. In contrast, SMCJ33CA is bi-directional - symmetrically clamping both positive and negative transients, with no polarity marking. The SMCJ33-E3/9AT is used on DC rails where polarity is fixed (e.g., +33 V to ground); SMCJ33CA suits AC-coupled or floating signal lines. Their VWM, VC, and PPPM values are identical, but forward characteristics differ significantly.
SMCJ33-E3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- Current - Peak Pulse (10/1000µs):
- 25.4A
- 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)
SMCJ33-E3/9AT FAQ
1.How can I place an order for SMCJ33-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33-E3/9AT 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 SMCJ33-E3/9AT reliable?
The price and inventory of SMCJ33-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ33-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33-E3/9AT?
SMCJ33-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33-E3/9AT 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 SMCJ33-E3/9AT?
For technical support, including SMCJ33-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33-E3/9AT requirements.
6.How does Aetrix verify that SMCJ33-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ33-E3/9AT 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 SMCJ33-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ33-E3/9AT?
All SMCJ33-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33-E3/9AT, 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 SMCJ33-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ33-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33-E3/9AT Tags
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