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Vishay General Semiconductor - Diodes Division SMCJ33CA-E3/57T
- Part No.:
- SMCJ33CA-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33CA-E3/57T.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ33CA-E3/57T from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with a 10/1000 μs waveform. It features a 33 V standoff voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, and clamps to ≤53.3 V at 28.1 A peak pulse current - protecting sensitive signal lines and power rails in automotive and industrial control systems.
For engineers reviewing the SMCJ33CA-E3/57T datasheet, SMCJ33CA-E3/57T pinout, SMCJ33CA-E3/57T application, or SMCJ33CA-E3/57T equivalent, key selection criteria include bidirectional surge capability, low clamping ratio (VC/VBR ≈ 1.42), AEC-Q101 qualification eligibility (via HE3 suffix variants), RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
The SMCJ33CA-E3/57T operates as a silicon avalanche diode optimized for transient suppression in both polarities, with symmetrical VBR min/max (36.7 V / 40.6 V) and identical clamping behavior in forward and reverse directions. Its glass-passivated junction ensures stable leakage (<1.0 μA at 33 V) and fast response time (<1.0 ps), enabling protection against ESD, inductive switching spikes, and lightning-induced surges.
Thermally, it sustains operation from –55 °C to +150 °C junction temperature, with RθJA = 75 °C/W and RθJL = 15 °C/W, and is rated for 6.5 W steady-state power dissipation at TA = 50 °C. The device meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 36.7–40.6 V at 1 mA - Avalanche onset range; ensures reliable triggering without premature conduction |
| VC (Clamping Voltage) | ≤53.3 V at IPPM = 28.1 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines safe IC stress level |
| PPPM (Peak Pulse Power) | 1500 W - Surge energy handling capacity under standardized 10/1000 μs waveform; enables robust IEC 61000-4-5 compliance |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - Minimal standby current; avoids loading of high-impedance sensor or communication lines |
| TJ max. | +150 °C - Maximum junction temperature; supports under-hood automotive and high-ambient industrial deployments |
| Package | SMC (DO-214AB) - Industry-standard 2-pin surface-mount outline; 7.75 mm × 6.22 mm footprint with 2.62 mm height; compatible with IPC-7351B |
Pinout & Package
SMCJ33CA-E3/57T uses the SMC (DO-214AB) package: a 2-terminal, non-polarized surface-mount case with no marking for bidirectional devices. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path (bidirectional) | Completes low-inductance surge path during either polarity event; connects to ground or common reference plane |
| Cathode | Transient current entry point (bidirectional) | Accepts surge current from protected line regardless of polarity; ties directly to I/O or power rail being safeguarded |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, USB D+/D−) without polarity concerns |
| 1500 W peak pulse rating | Withstands 4 kV/2 Ω IEC 61000-4-5 surge test levels when properly laid out - eliminates need for cascaded protection stages |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage exposure to downstream ICs; critical for 3.3 V or 5 V logic interfaces with tight absolute maximum ratings |
| AEC-Q101 qualification path | HE3/HM3 variants available - supports functional safety requirements in automotive body electronics and ADAS sensor modules |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; reduces manufacturing overhead in high-volume SMT lines |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and temperature/pressure sensors exposed to load dump and ISO 7637-2 pulses in engine control units. IC Role / Device Role / Timing Role: Bidirectional TVS placed across sensor supply and signal lines to clamp transients before they reach analog front-end or MCU GPIO. Use Value: Prevents latch-up or gate oxide damage in 3.3 V microcontrollers and precision ADCs by limiting surge voltage to ≤53.3 V during 100 A/10 ms events. |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers subjected to relay coil flyback and field wiring ESD. IC Role / Device Role / Timing Role: Primary transient suppressor at terminal block interface, shunting surge energy to chassis ground before entering optocoupler isolation stage. Use Value: Maintains system uptime by eliminating false triggers and input latch-up caused by >1 kV contact discharge events per IEC 61000-4-2 Level 4. |
| Telecom Line Interface | Consumer USB Port Protection |
Use Scenario: Shielding Ethernet PHY magnetics and PoE injectors from lightning-induced surges on outdoor telecom links. IC Role / Device Role / Timing Role: Secondary-level TVS mounted adjacent to RJ45 jack, working with GDT primary protectors to limit let-through voltage. Use Value: Achieves <100 V clamping across differential pairs under 10/1000 μs threat, preserving Ethernet signal integrity and PHY IC reliability. |
Use Scenario: Guarding USB 2.0 data lines (D+/D−) and VBUS against ESD and hot-plug transients in portable docking stations. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor placed directly at connector, minimizing stub length to preserve 480 Mbps signaling. Use Value: Limits ESD-induced voltage to <55 V on D+ line during ±15 kV air discharge, preventing USB controller reset or enumeration failure. |
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-13-F (Diodes Inc.) | Same VWM (33 V), lower PPPM (1000 W), higher VC (58 V at 24 A); SOD-123FL package (smaller, lower thermal mass) | Lower surge margin; suited for space-constrained consumer ports but not industrial 4 kV surge testing | Select when board area is critical and surge threat level is limited to IEC 61000-4-2 only |
| TPSMC33CA (Littelfuse) | Identical VWM (33 V), same PPPM (1500 W), tighter VBR tolerance (36.7–40.0 V), same SMC package | Direct form-fit replacement with marginally improved clamping consistency; AEC-Q101 qualified in HE3 variant | Choose for drop-in validation where Vishay's HE3 automotive variant is unavailable |
Compared with SAC33CA-13-F, SMCJ33CA-E3/57T delivers 50 % higher surge power headroom and lower clamping voltage, making it suitable for harsher environments; versus TPSMC33CA, it offers identical protection performance but differs in traceability documentation and qualification reporting scope.
Availability
SMCJ33CA-E3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer USB port hardening requiring stable component supply, full RoHS compliance, and long-term production continuity.
Supply support for SMCJ33CA-E3/57T 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-grade qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and communications infrastructure where robustness and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMCJ33CA-E3/57T at its rated peak pulse current?
The SMCJ33CA-E3/57T clamps to a maximum of 53.3 V at its specified peak pulse current of 28.1 A under a 10/1000 μs waveform. This value is measured across the device terminals during surge testing and defines the upper voltage limit imposed on protected circuitry - critical for ensuring compatibility with 3.3 V or 5 V logic interfaces. The SMCJ33CA-E3/57T maintains this clamping performance consistently across its operating temperature range.
Is SMCJ33CA-E3/57T suitable for automotive applications?
SMCJ33CA-E3/57T itself is RoHS-compliant commercial-grade; however, Vishay offers AEC-Q101-qualified versions under the HE3 and HM3 suffixes (e.g., SMCJ33CAHE3). These variants undergo extended stress testing including temperature cycling, humidity bias, and mechanical shock - validating suitability for under-hood and chassis-mounted automotive ECUs. For production automotive use, specify the HE3 variant rather than SMCJ33CA-E3/57T.
How does the bidirectional design of SMCJ33CA-E3/57T affect its PCB layout?
The bidirectional nature of SMCJ33CA-E3/57T eliminates polarity concerns during placement - no cathode band marking is present, and either terminal may connect to the protected line or ground. Layout requires symmetric, low-inductance traces to both terminals, with minimum copper area per datasheet-recommended 8.0 mm × 8.0 mm pads per terminal. Avoid routing signal traces beneath the device to prevent coupling; maintain ≥1.5 mm clearance to adjacent high-voltage nodes.
What is the maximum operating temperature for SMCJ33CA-E3/57T?
The SMCJ33CA-E3/57T has a maximum junction temperature (TJ max.) of +150 °C and an operating ambient range of –55 °C to +150 °C. Its thermal resistance values - RθJA = 75 °C/W and RθJL = 15 °C/W - mean that at 6.5 W steady-state dissipation, the junction will rise ~488 °C above ambient if uncooled; thus, derating is essential. In practice, the SMCJ33CA-E3/57T is used for transient-only duty, not continuous power, so thermal design focuses on short-duration surge energy dissipation.
Does SMCJ33CA-E3/57T require a heatsink for standard surge protection use?
No, the SMCJ33CA-E3/57T does not require an external heatsink for typical transient suppression applications because it handles energy in short pulses (microseconds to milliseconds), not continuous power. Its 6.5 W power dissipation rating applies only at TA = 50 °C with infinite heatsinking - a theoretical limit. Real-world use relies on thermal mass of PCB copper pads (per recommended 8.0 mm × 8.0 mm layout) to absorb and dissipate surge heat. Heatsinks are unnecessary and impractical for TVS diodes due to their pulsed duty cycle.
SMCJ33CA-E3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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-E3/57T FAQ
1.How can I place an order for SMCJ33CA-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33CA-E3/57T 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-E3/57T reliable?
The price and inventory of SMCJ33CA-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33CA-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ33CA-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33CA-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33CA-E3/57T?
SMCJ33CA-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33CA-E3/57T 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-E3/57T?
For technical support, including SMCJ33CA-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33CA-E3/57T requirements.
6.How does Aetrix verify that SMCJ33CA-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ33CA-E3/57T 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-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ33CA-E3/57T?
All SMCJ33CA-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33CA-E3/57T, 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-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ33CA-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33CA-E3/57T Tags
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