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Vishay General Semiconductor - Diodes Division SMCJ33CA-E3/9AT
- Part No.:
- SMCJ33CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33CA-E3/9AT.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:868
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Product details
Overview
SMCJ33CA-E3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 33 V standoff voltage, 1500 W peak pulse power rating, and 53.3 V clamping voltage at 28.1 A peak pulse current. It protects sensitive ICs, MOSFETs, and sensor signal lines against inductive switching transients and lightning-induced surges in automotive and industrial power rails.
For engineers reviewing the SMCJ33CA-E3/9AT datasheet, SMCJ33CA-E3/9AT pinout, SMCJ33CA-E3/9AT application, or SMCJ33CA-E3/9AT equivalent, key selection criteria include bidirectional clamping capability, 1500 W 10/1000 μs surge rating, -55 °C to +150 °C operating junction temperature, RoHS-compliant matte tin plating, and compliance with UL 497B and AEC-Q101 qualification requirements.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative polarity transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at 33 V), while the low incremental surge resistance supports consistent clamping performance under repetitive surge stress.
The device is rated for 1500 W peak pulse power per 10/1000 μs waveform, with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), allowing effective heat dissipation on standard 8.0 mm × 8.0 mm copper pads. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 when ordered with HE3 suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 33 V - Maximum continuous reverse working voltage before clamping initiates |
| Breakdown Voltage (VBR) | 36.7 V min / 40.6 V max at 1 mA - Confirmed avalanche onset range for reliable triggering |
| Clamping Voltage (VC) | 53.3 V at 28.1 A IPPM - Peak voltage seen by protected circuit during 10/1000 μs surge |
| Peak Pulse Power (PPPM) | 1500 W - Energy-handling capacity for standardized transient waveforms |
| Operating Temperature | -55 °C to +150 °C - Full-range operation suitable for under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
| RoHS Compliance | E3 suffix - Lead-free, halogen-free compliant per JEDEC JESD201 Class 2 whisker test |
Pinout & Package
SMCJ33CA-E3/9AT uses the SMC (DO-214AB) package: a two-terminal, non-polarized surface-mount case with no cathode marking (bidirectional configuration). Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Acts as cathode during positive surges and anode during negative surges - no fixed polarity |
| Cathode | Transient return path (bidirectional) | Acts as anode during positive surges and cathode during negative surges - symmetrical conduction |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 1500 W 10/1000 μs rating | Supports robust immunity to IEC 61000-4-5 Level 4 surges (4 kV line-earth) in properly designed layouts |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on downstream components during surge events |
| AEC-Q101 qualification option | Available with HE3 suffix for automotive-grade reliability validation in engine control and ADAS modules |
| UL 497B recognition (QVGQ2) | Validated for telecom and industrial interface protection per safety standards for protectors |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppressing load-dump and jump-start transients on 24 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power input pins to clamp ±120 V spikes within 1 ns response time. Use Value: Prevents latch-up or gate oxide damage in MCU power supplies and CAN transceivers during ISO 7637-2 pulse 5a/b events. | Use Scenario: Protecting analog outputs of pressure/temperature sensors connected to PLC analog inputs. IC Role / Device Role / Timing Role: Low-capacitance (≈200 pF) shunt device limiting transient voltage to ≤53.3 V during ESD or field-wiring faults. Use Value: Maintains signal integrity and prevents ADC saturation or op-amp input stage damage in 4–20 mA loop interfaces. |
| Telecom Interface Protection | Consumer Equipment DC Power Input |
Use Scenario: Guarding RS-485 transceiver bus lines against lightning-induced surges in outdoor base stations. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between differential pair and ground, rated for UL 497B protector classification. Use Value: Enables compliance with ITU-T K.20/21 secondary protection requirements while preserving signal rise time. | Use Scenario: Safeguarding USB-C PD and 12 V adapter inputs in smart home hubs and set-top boxes. IC Role / Device Role / Timing Role: Primary surge suppressor mounted at board edge, absorbing >1000 W transients before reaching DC-DC converters. Use Value: Eliminates need for secondary TVS stages and reduces BOM count while meeting UL 62368-1 transient immunity clauses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC33CA | Lower PPPM (600 W), same VWM (33 V), SOD-123FL package (smaller footprint, lower thermal mass) | Not suitable for high-energy 10/1000 μs surges; limited to IEC 61000-4-2 ESD and low-energy transients | Select only where space constraints outweigh energy handling needs and surge threat level is low |
| 1.5KE33CA | Same VWM (33 V) and bidirectional function, but through-hole DO-201 package, higher thermal resistance (RθJA = 100 °C/W) | Requires PCB real estate for axial leads and larger pad clearance; unsuitable for automated SMT assembly | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SAC33CA and 1.5KE33CA, the SMCJ33CA-E3/9AT delivers superior surge robustness (1500 W vs. 600 W or 1500 W with inferior thermal management), full SMT manufacturability, and AEC-Q101 qualification path - making it optimal for production-grade automotive and industrial systems requiring repeatable high-energy clamping.
Availability
SMCJ33CA-E3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom port surge suppression requiring stable component supply, long-term lifecycle support, and traceable RoHS-compliant sourcing.
Supply support for SMCJ33CA-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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments including automotive, industrial automation, and telecommunications infrastructure.
FAQ
What does the "CA" suffix indicate in SMCJ33CA-E3/9AT?
The "CA" suffix denotes a bidirectional configuration, meaning the SMCJ33CA-E3/9AT provides symmetrical clamping for both positive and negative voltage transients without polarity dependence. This differs from unidirectional variants (e.g., SMCJ33A), which require correct cathode orientation and only clamp in one direction. The CA version is ideal for AC-coupled lines or floating references where surge polarity is unpredictable.
Is SMCJ33CA-E3/9AT qualified for automotive applications?
The base SMCJ33CA-E3/9AT is RoHS-compliant and commercial-grade; however, Vishay offers AEC-Q101 qualification under the HE3 ordering code (e.g., SMCJ33CAHE3_A/I). The SMCJ33CA-E3/9AT itself is not AEC-Q101 qualified, but shares identical electrical and thermal characteristics with the qualified variant - only differing in traceability documentation and lot-level testing protocol.
What is the maximum clamping voltage of SMCJ33CA-E3/9AT and how is it measured?
The maximum clamping voltage of SMCJ33CA-E3/9AT is 53.3 V, measured at 28.1 A peak pulse current using a standardized 10/1000 μs double-exponential surge waveform. This value represents the highest voltage imposed on the protected circuit during worst-case transient conditions and is guaranteed per Vishay's datasheet specification 88394, page 2.
Can SMCJ33CA-E3/9AT be used in place of a unidirectional TVS like SMCJ33A?
No - SMCJ33CA-E3/9AT is bidirectional and lacks polarity marking, while SMCJ33A is unidirectional with a defined cathode band. Substituting them requires verifying circuit topology: SMCJ33CA-E3/9AT may be used in place of SMCJ33A only if the protected node is referenced to ground on both sides (e.g., differential bus) and no forward conduction path exists. Reverse substitution is unsafe due to polarity mismatch.
What is the thermal resistance and how does it affect layout design for SMCJ33CA-E3/9AT?
The SMCJ33CA-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. To maintain safe operation below 150 °C junction temperature during repeated surges, PCB layout must use minimum 8.0 mm × 8.0 mm copper pads per terminal as specified in Vishay's datasheet - reducing RθJA by up to 30% compared to standard land patterns.
SMCJ33CA-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ33CA-E3/9AT FAQ
1.How can I place an order for SMCJ33CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33CA-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 SMCJ33CA-E3/9AT reliable?
The price and inventory of SMCJ33CA-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 SMCJ33CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ33CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33CA-E3/9AT?
SMCJ33CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33CA-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 SMCJ33CA-E3/9AT?
For technical support, including SMCJ33CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ33CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ33CA-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 SMCJ33CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ33CA-E3/9AT?
All SMCJ33CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33CA-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 SMCJ33CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ33CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33CA-E3/9AT Tags
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