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Vishay General Semiconductor - Diodes Division SMCJ33CA-M3/57T
- Part No.:
- SMCJ33CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33CA-M3/57T.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,654
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Product details
Overview
SMCJ33CA-M3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 33 V standoff voltage (VWM), 53.3 V maximum clamping voltage (VC) at 28.1 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (PPPM) under 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial I/O modules.
For engineers reviewing the SMCJ33CA-M3/57T datasheet, SMCJ33CA-M3/57T pinout, SMCJ33CA-M3/57T application, or SMCJ33CA-M3/57T equivalent, key selection criteria include bidirectional clamping symmetry, low incremental surge resistance, AEC-Q101 qualification eligibility (via HM3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transients exceeding its reverse standoff voltage (VWM = 33 V). Its bidirectional architecture ensures symmetrical clamping in both polarities, with breakdown voltage (VBR) specified at 36.7–40.6 V (min/max) at 1 mA test current - validated per ANSI/IEEE C62.35 standards.
Thermal performance is defined by junction-to-ambient thermal resistance (RθJA = 75 °C/W) and junction-to-lead resistance (RθJL = 15 °C/W), enabling reliable operation up to TJ = +150 °C. The device uses glass-passivated silicon junctions and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability requirements.
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 IT = 1 mA - defines precise breakdown threshold for bidirectional conduction |
| VC @ IPPM | 53.3 V at 28.1 A - clamping voltage limiting downstream circuit stress during 10/1000 µs surge |
| PPPM | 1500 W - peak transient energy absorption capability without failure |
| ID @ VWM | 1.0 µA - ultra-low leakage ensuring minimal standby power loss |
| TJ max. | +150 °C - enables deployment in under-hood automotive and high-temperature industrial environments |
| Package | SMC (DO-214AB) - surface-mount outline with 8.0 mm × 8.0 mm thermal pad footprint per terminal |
Pinout & Package
SMCJ33CA-M3/57T is housed in an SMC (DO-214AB) package: low-profile, halogen-free, RoHS-compliant, with matte tin-plated leads. No polarity marking is present on bidirectional variants; terminals are symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; common node in bidirectional clamping | Connected to protected line (e.g., CAN_H or RS-485 A); forms symmetrical clamp path with cathode |
| Cathode | Current exit point in forward bias; common node in bidirectional clamping | Connected to protected line (e.g., CAN_L or RS-485 B); completes bidirectional surge shunt path |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR min/max and VC performance in both directions - eliminates need for orientation-aware layout |
| Low incremental surge resistance | Enables tighter VC margin (53.3 V at 33 V VWM), reducing voltage overshoot during fast transients |
| MSL Level 1 rating | Compatible with lead-free reflow up to 260 °C peak - supports standard SMT assembly without moisture sensitivity concerns |
| AEC-Q101 qualification path | HM3 suffix variant available - meets automotive reliability requirements for engine control, ADAS sensor interfaces |
| Glass passivated junction | Enhances long-term stability and surge endurance versus epoxy-passivated alternatives |
Applications
| Automotive Power Line Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power rails against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between VCC and GND, clamping surges before they reach LDO inputs. Use Value: Withstands 1500 W pulses and maintains <1.0 µA leakage at 33 V, preserving system quiescent current budget. |
Use Scenario: Safeguarding differential RS-485 transceivers (e.g., THVD1550) against ESD and lightning-induced surges on field wiring. IC Role / Device Role / Timing Role: Bidirectional line-to-line and line-to-ground clamp across A/B bus terminals. Use Value: Symmetrical 53.3 V clamping limits differential swing to safe levels while maintaining signal integrity up to 20 Mbps. |
| Consumer USB-C Port Protection | Telecom DSL Line Interface |
Use Scenario: Guarding USB-C VBUS and CC lines against hot-plug transients and ESD events per IEC 61000-4-2 Level 4. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed directly at connector pins. Use Value: Sub-1 µA leakage and 53.3 V clamping prevent false VBUS detection while meeting ±15 kV air/±8 kV contact ESD immunity. |
Use Scenario: Protecting ADSL/VDSL line drivers and receivers from induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Primary-level surge suppressor mounted at line interface transformer secondary. Use Value: 1500 W PPPM rating handles longitudinal surges up to 10/1000 µs, extending modem MTBF in lightning-prone regions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC33CA-13-F | Lower PPPM (600 W), higher VBR tolerance (±10%), DO-214AA (SMB) package | Limited to lower-energy transients; smaller footprint but reduced thermal mass | Select when board space is constrained and surge energy remains below 600 W |
| 1.5KE33CA | Through-hole TO-218 package, same VWM/VC specs, higher RθJA (100 °C/W) | Not suitable for high-density SMT designs; requires wave solder or hand assembly | Choose only for legacy through-hole systems where rework flexibility outweighs automation needs |
Compared with SAC33CA-13-F and 1.5KE33CA, the SMCJ33CA-M3/57T delivers superior surge handling (1500 W vs. 600 W/1500 W), optimized SMT manufacturability, and lower thermal resistance - making it the preferred choice for new automotive and industrial PCB designs requiring AEC-Q101 readiness and high-reliability SMT integration.
Availability
SMCJ33CA-M3/57T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O cards, and telecom line interface units requiring stable component supply, halogen-free compliance, and consistent SMC-package form factor.
Supply support for SMCJ33CA-M3/57T 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, efficiency, and application-specific optimization.
The SMCJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom infrastructure where robustness, AEC-Q101 readiness, and repeatable clamping performance are mandatory.
FAQ
What does the "CA" suffix indicate in SMCJ33CA-M3/57T?
The "CA" suffix denotes a bidirectional configuration: SMCJ33CA-M3/57T provides symmetrical clamping in both polarities, unlike unidirectional "A" variants. This eliminates orientation dependency during placement and ensures identical protection for positive and negative transients - critical for AC-coupled interfaces like RS-485 or Ethernet PHYs. The SMCJ33CA-M3/57T achieves this via internal back-to-back diode structure.
Is SMCJ33CA-M3/57T qualified to AEC-Q101?
The base SMCJ33CA-M3/57T is commercial-grade and halogen-free (M3 suffix), but not AEC-Q101 qualified. However, Vishay offers the HM3-suffixed variant (e.g., SMCJ33CAHM3_X) which carries full AEC-Q101 qualification for automotive use. Engineers requiring automotive qualification must specify the HM3 version - the M3/57T reel itself does not include AEC-Q101 test documentation or screening.
What is the maximum clamping voltage of SMCJ33CA-M3/57T under surge conditions?
The SMCJ33CA-M3/57T has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current (IPPM) of 28.1 A under the standardized 10/1000 µs waveform. This value is measured at the device terminals and represents the upper limit of voltage imposed on protected circuitry during worst-case surge events - a key parameter for ensuring downstream ICs remain within absolute maximum ratings.
How does the SMC (DO-214AB) package of SMCJ33CA-M3/57T support thermal management?
The SMC (DO-214AB) package of SMCJ33CA-M3/57T is designed for effective thermal dissipation: its recommended mounting uses 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, achieving a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W. This allows the SMCJ33CA-M3/57T to sustain repeated 1500 W surges without exceeding its +150 °C maximum junction temperature when properly laid out on FR-4 with adequate copper area.
Can SMCJ33CA-M3/57T be used in place of unidirectional SMCJ33A-M3/57T?
No - SMCJ33CA-M3/57T is bidirectional and lacks polarity marking, while SMCJ33A-M3/57T is unidirectional with cathode band identification. Interchanging them risks incorrect installation and failure to clamp negative transients. Though both share VWM = 33 V and similar VC, their internal structures differ: SMCJ33CA-M3/57T uses dual-diode symmetry, whereas SMCJ33A-M3/57T is single-junction. Use only the CA variant where bidirectional protection is explicitly required.
SMCJ33CA-M3/57T 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 (SMC)
SMCJ33CA-M3/57T FAQ
1.How can I place an order for SMCJ33CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33CA-M3/57T 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-M3/57T reliable?
The price and inventory of SMCJ33CA-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33CA-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ33CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33CA-M3/57T?
SMCJ33CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33CA-M3/57T 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-M3/57T?
For technical support, including SMCJ33CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33CA-M3/57T requirements.
6.How does Aetrix verify that SMCJ33CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ33CA-M3/57T 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-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ33CA-M3/57T?
All SMCJ33CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33CA-M3/57T, 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-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ33CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33CA-M3/57T Tags
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