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Vishay General Semiconductor - Diodes Division SMCJ33A-M3/57T
- Part No.:
- SMCJ33A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33A-M3/57T.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,526
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Product details
Overview
SMCJ33A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V maximum 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 power rail protection and industrial sensor interface circuits.
For engineers reviewing the SMCJ33A-M3/57T datasheet, SMCJ33A-M3/57T pinout, SMCJ33A-M3/57T application, or SMCJ33A-M3/57T equivalent, key selection criteria include clamping performance under 28.1 A surge, thermal resistance (RθJA = 75 °C/W), halogen-free RoHS compliance (M3 suffix), and unidirectional polarity marking for correct PCB orientation in DC-biased protection paths.
Technical Context
This TVS diode operates as a voltage-clamping device triggered by transient overvoltage events exceeding its reverse stand-off voltage of 33 V. Its glass-passivated junction ensures stable breakdown behavior, while low incremental surge resistance enables rapid energy diversion during 10/1000 µs surges up to 1500 W.
The SMCJ33A-M3/57T is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and exhibits 0.100 %/°C temperature coefficient of VBR - critical for predictable clamping across automotive thermal cycles.
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 - guaranteed breakdown range defining turn-on threshold tolerance |
| VC @ IPPM | 53.3 V at 28.1 A - clamped voltage seen by protected circuit during full-rated 1500 W transient |
| PPPM | 1500 W - peak pulse power handling capability with standard 10/1000 µs waveform |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, determines derating above 25 °C |
| Package | SMC (DO-214AB) - surface-mount outline with 8.0 mm × 8.0 mm copper pad requirement for rated power |
| Polarity | Unidirectional - cathode marked by band; blocks forward current until breakdown, conducts only in reverse surge |
Pinout & Package
SMCJ33A-M3/57T uses the SMC (DO-214AB) package: molded plastic case with matte tin-plated leads, 0.305–0.320 inch length, 0.220–0.246 inch width, and cathode band marking on one end. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per datasheet fig. 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage rail; forms return path during clamping conduction |
| Cathode | High-side transient input node | Connected to protected line (e.g., 33 V supply); band-marked end accepts surge current into ground |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free & RoHS-compliant | M3 suffix confirms compliance with JEDEC J-STD-201 Class 2 whisker resistance and environmental directives |
| Fast response time | Sub-nanosecond avalanche turn-on ensures clamping before sensitive ICs experience overvoltage stress |
| Low incremental surge resistance | Minimizes VC rise under high IPPM, preserving margin between clamped voltage and protected device's absolute max rating |
| MSL Level 1 rating | Supports standard SMT reflow without moisture-induced popcorning; peak temperature up to 260 °C allowed |
| 1500 W pulse power | Handles IEC 61000-4-5 Level 4 surge (4 kV/2 Ω) on 33 V rails with margin when properly mounted |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 33 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 33 V supply and chassis ground to clamp positive-going surges. Use Value: Clamps to ≤53.3 V at 28.1 A, maintaining safe headroom below 60 V-rated power management ICs. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: TVS shunt-connected across sensor output and ground to suppress ESD and inductive switching noise. Use Value: 1.0 µA max leakage at 33 V ensures minimal impact on 4–20 mA loop accuracy and offset stability. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drive Supplies |
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges on outdoor cabinet feeds. IC Role / Device Role / Timing Role: Paired unidirectional TVS (cathode to -48 V rail) clamps negative transients toward ground reference. Use Value: 1500 W PPPM rating sustains multiple 10/1000 µs surges without degradation in central office power systems. |
Use Scenario: Shielding microcontroller supply inputs in washing machine motor control boards from relay coil kickback. IC Role / Device Role / Timing Role: TVS installed at 33 V LDO input to absorb 100–200 A spikes from brushed motor commutation. Use Value: 200 A IFSM rating allows survival of repeated half-sine surges without bond wire fusing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-M3/57T | Lower PPPM (400 W), smaller SMA package, higher RθJA (110 °C/W) | Suitable only for lower-energy transients; requires tighter thermal layout | Select when space-constrained and surge threat is limited to IEC 61000-4-2 ESD or low-current inductive spikes |
| SMCJ33CA-M3/57T | Bidirectional variant; symmetric VBR (36.7–40.6 V) in both polarities; same PPPM/package | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus) | Choose only if protecting bidirectional signals or floating references where reverse polarity surges occur |
Compared with SMAJ33A-M3/57T, the SMCJ33A-M3/57T delivers 275 % higher surge power handling and 32 % lower thermal resistance; versus SMCJ33CA-M3/57T, it offers lower capacitance and avoids unnecessary bidirectional conduction in DC-biased rails.
Availability
SMCJ33A-M3/57T is available at Aetrix Electronics and suitable for automotive ECU power protection, industrial sensor interface hardening, and telecom DC feed surge suppression requiring stable component supply and halogen-free compliance.
Supply support for SMCJ33A-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and AEC-Q qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ISO 7637, IEC 61000-4-5, and ESD threats is mandatory.
FAQ
What is the maximum clamping voltage of the SMCJ33A-M3/57T under full-rated surge current?
The SMCJ33A-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 using the standard 10/1000 µs waveform. This value is measured at the device terminals under specified test conditions with 0.31" × 0.31" copper pads, and defines the highest voltage the protected circuit will experience during worst-case transient events. The SMCJ33A-M3/57T maintains this clamping performance across its full operating temperature range.
Does the SMCJ33A-M3/57T meet automotive qualification standards?
The base SMCJ33A-M3/57T is commercial-grade and halogen-free RoHS-compliant but not AEC-Q101 qualified. For automotive applications requiring AEC-Q101, Vishay offers the SMCJ33A-HM3/57T variant (with HM3 suffix), which adds stress testing per AEC-Q101 including HTGB, HTRB, and temperature cycling. The SMCJ33A-M3/57T remains suitable for non-safety-critical automotive subsystems where qualification is not mandated.
How does the M3 suffix affect the SMCJ33A-M3/57T's material composition and reliability?
The M3 suffix on SMCJ33A-M3/57T indicates halogen-free, RoHS-compliant construction meeting JEDEC J-STD-201 Class 2 whisker resistance requirements. It uses bromine-free flame-retardant molding compound (UL 94 V-0 rated) and matte tin-plated leads solderable per J-STD-002. This enhances long-term reliability in humid or thermally cycled environments compared to legacy leaded or halogen-containing variants. The SMCJ33A-M3/57T retains identical electrical specs and thermal performance as E3-suffix parts.
Can the SMCJ33A-M3/57T be used in bidirectional signal protection?
No - the SMCJ33A-M3/57T is strictly unidirectional and must be oriented with its cathode band toward the protected line. For bidirectional signal lines such as RS-485, CAN, or AC-coupled audio, the SMCJ33CA-M3/57T (CA suffix) is required. Using the unidirectional SMCJ33A-M3/57T on bidirectional paths risks forward conduction during negative excursions, potentially damaging downstream circuitry or distorting signals. Always verify polarity alignment before placing the SMCJ33A-M3/57T in design.
What is the recommended PCB pad layout for optimal thermal and surge performance of the SMCJ33A-M3/57T?
Vishay specifies minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads for each terminal of the SMCJ33A-M3/57T to achieve rated 1500 W pulse power and 75 °C/W thermal resistance. Pads must be solid, unslotted, and directly connected to internal ground/power planes via multiple thermal vias. Avoid narrow traces between pads and protected nodes - use ≥20 mil width. The SMCJ33A-M3/57T's performance degrades significantly if mounted on smaller pads or isolated islands, especially above 25 °C ambient.
SMCJ33A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ33A-M3/57T FAQ
1.How can I place an order for SMCJ33A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33A-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 SMCJ33A-M3/57T reliable?
The price and inventory of SMCJ33A-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 SMCJ33A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ33A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33A-M3/57T?
SMCJ33A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33A-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 SMCJ33A-M3/57T?
For technical support, including SMCJ33A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33A-M3/57T requirements.
6.How does Aetrix verify that SMCJ33A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ33A-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 SMCJ33A-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ33A-M3/57T?
All SMCJ33A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33A-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 SMCJ33A-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ33A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33A-M3/57T Tags
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