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Vishay General Semiconductor - Diodes Division SMCJ33CA/57T
- Part No.:
- SMCJ33CA/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33CA/57T.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,073
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Product details
Overview
SMCJ33CA/57T from Vishay General Semiconductor is a bi-directional 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), 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 sensor signal lines, industrial I/O ports, and telecom interface protection.
For engineers reviewing the SMCJ33CA/57T datasheet, SMCJ33CA/57T pinout, SMCJ33CA/57T application, or SMCJ33CA/57T equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, 150 °C junction temperature rating, low incremental surge resistance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ33CA/57T operates as a bi-directional avalanche diode, leveraging glass-passivated silicon junctions to clamp transient voltages symmetrically in both polarities. Its breakdown voltage (VBR) ranges from 36.7 V to 40.6 V at 1 mA test current, ensuring reliable triggering above 33 V stand-off while maintaining sub-1 µA leakage at rated VWM.
Thermally, it exhibits 15 °C/W junction-to-lead thermal resistance (RθJL) and 75 °C/W junction-to-ambient (RθJA) on standard PCB pads, enabling sustained operation up to 150 °C junction temperature. It meets MSL Level 1 per J-STD-020 and passes JESD 201 Class 1A whisker testing (E3 suffix).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - ensures consistent avalanche turn-on across production lots |
| VC @ IPPM | 53.3 V at 28.1 A - limits protected circuit voltage during 10/1000 µs transients |
| PPPM | 1500 W - handles high-energy surges such as ISO 7637-2 Pulse 5a without failure |
| TJ max | +150 °C - supports under-hood automotive and industrial ambient environments |
| Package | DO-214AB (SMCJ) - surface-mount, low-profile, RoHS-compliant, AEC-Q101 qualified |
| Leakage ID | 1.0 µA at 33 V - minimizes standby power loss in battery-powered systems |
Pinout & Package
SMCJ33CA/57T uses the DO-214AB (SMCJ) package: molded plastic case with J-bend leads, matte tin-plated terminals solderable per J-STD-002, no polarity marking (bi-directional). Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per Vishay specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Bi-directional avalanche junction | Identical clamping behavior in either polarity; no cathode band marking required |
| Lead 1 / Lead 2 | Surge current path | Both terminals conduct equally during positive or negative transients; symmetric layout essential |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal/humidity stress |
| MSL Level 1 rating | Enables standard reflow without moisture sensitivity concerns - no baking required pre-assembly |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., EFT bursts) |
| 1500 W peak pulse power | Withstands repeated 10/1000 µs surges up to 28.1 A without degradation per JEDEC standards |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional TVS clamping device placed directly at connector entry point to shunt surge energy before reaching IC pins. Use Value: Maintains signal integrity by limiting transient voltage to ≤53.3 V, preventing latch-up or gate oxide damage in 3.3 V/5 V interface ICs. | Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring induced surges and ground bounce in factory automation. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input channels, coordinated with series impedance and filtering. Use Value: Enables compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) up to 1 kV/42 Ω without derating. |
| Telecom Interface Protection | Consumer Power Adapter EMI Filtering |
Use Scenario: Shielding RS-485/RS-232 transceivers in base station backhaul equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: First-line transient suppressor on differential data lines, placed before common-mode chokes and TVS arrays. Use Value: Symmetric clamping preserves differential signal swing while absorbing >1500 W surge energy per line pair. | Use Scenario: Secondary-side transient suppression in AC/DC adapters for smart home devices exposed to mains-borne noise and capacitor discharge events. IC Role / Device Role / Timing Role: Standoff-rated protector across DC output rails (e.g., 5 V, 12 V) downstream of regulation. Use Value: Prevents brownout or reset events in connected microcontrollers by clamping output rail spikes to ≤53.3 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Lower PPPM (600 W), smaller SMB package (DO-214AA), higher RθJA (110 °C/W) | Less suitable for high-energy surges; limited thermal margin in enclosed enclosures | Select when board space is constrained and surge energy is ≤600 W (e.g., low-power IoT nodes) |
| SMCJ33CAHE3/57T | Identical electrical specs; HE3 suffix denotes AEC-Q101 qualification and JESD 201 Class 2 whisker testing | No functional difference; intended for automotive safety-critical subsystems requiring enhanced process validation | Prefer for ASIL-B designs where extended reliability documentation and traceability are mandated |
Compared with SMBJ33CA and SMCJ33CAHE3/57T, the SMCJ33CA/57T offers optimal balance of 1500 W surge handling, industry-standard AEC-Q101 qualification, and cost-effective commercial-grade sourcing - making it ideal for high-volume industrial and Tier-2 automotive applications where full HE3 traceability is not required.
Availability
SMCJ33CA/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom data line protection requiring stable component supply, full traceability, and rapid fulfillment of SMT reels.
Supply support for SMCJ33CA/57T 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, power efficiency, and automotive qualification.
The SMCJ series belongs to Vishay's TRANSZORB® transient voltage suppressor family, engineered specifically for high-energy, bi-directional surge immunity in harsh environments - targeting automotive, industrial, and telecom infrastructure applications.
FAQ
What is the clamping voltage of SMCJ33CA/57T and how is it measured?
The SMCJ33CA/57T has a maximum clamping voltage (VC) of 53.3 V, measured at 28.1 A peak pulse current (IPPM) using a standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed per Vishay Document Number 88394 and reflects the voltage seen across the device terminals during worst-case transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMCJ33CA/57T suitable for automotive applications?
Yes, SMCJ33CA/57T is AEC-Q101 qualified and rated for operation from –55 °C to +150 °C junction temperature. It meets automotive surge immunity requirements including ISO 7637-2 and IEC 61000-4-5, and its DO-214AB package supports automated SMT assembly with MSL Level 1 handling - making SMCJ33CA/57T appropriate for engine control units, body electronics, and ADAS sensor interfaces.
What does the "/57T" suffix mean in SMCJ33CA/57T?
The "/57T" suffix in SMCJ33CA/57T indicates packaging: 7-inch diameter plastic tape-and-reel format containing 850 units per reel. This is the standard logistics configuration for high-volume SMT production. The "E3" in the base part (e.g., SMCJ33CA-E3/57T) denotes RoHS-compliant, commercial-grade construction per Vishay's ordering nomenclature.
How does SMCJ33CA/57T differ from uni-directional SMCJ33A?
SMCJ33CA/57T is bi-directional with symmetrical clamping in both polarities and no cathode marking, while SMCJ33A is uni-directional with a cathode band and forward voltage drop (~3.5 V at 100 A). The CA version supports AC-coupled or floating signal lines (e.g., RS-485), whereas the A version suits DC-biased rails where polarity is fixed - SMCJ33CA/57T is mandatory for applications requiring bidirectional transient suppression.
What PCB layout guidance applies to SMCJ33CA/57T?
Vishay specifies mounting SMCJ33CA/57T on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated 1500 W pulse power. Thermal vias under pads and short, wide traces are recommended to minimize inductance and maintain clamping performance. Avoid routing sensitive signals near the device body, and ensure no silkscreen or solder mask encroachment on pad edges per IPC-7351B.
SMCJ33CA/57T 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:
- -
- 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/57T FAQ
1.How can I place an order for SMCJ33CA/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33CA/57T 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/57T reliable?
The price and inventory of SMCJ33CA/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33CA/57T is usually 5 days.
3.What payment methods are accepted for SMCJ33CA/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33CA/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33CA/57T?
SMCJ33CA/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33CA/57T 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/57T?
For technical support, including SMCJ33CA/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33CA/57T requirements.
6.How does Aetrix verify that SMCJ33CA/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ33CA/57T 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/57T meets industry standards.
7.What is the process for return or replacement of SMCJ33CA/57T?
All SMCJ33CA/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33CA/57T, 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/57T part is unused and in its original packaging.
Return procedure for SMCJ33CA/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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