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Vishay General Semiconductor - Diodes Division SMCJ33A-M3/9AT
- Part No.:
- SMCJ33A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33A-M3/9AT.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,799
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Product details
Overview
SMCJ33A-M3/9AT from Vishay General Semiconductor is a unidirectional 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 stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA test current, and clamps to 53.3 V at 28.1 A peak pulse current - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power rails.
For engineers reviewing the SMCJ33A-M3/9AT datasheet, SMCJ33A-M3/9AT pinout, SMCJ33A-M3/9AT application, or SMCJ33A-M3/9AT equivalent, key selection criteria include unidirectional polarity, 1500 W surge rating, 53.3 V clamping voltage at rated IPPM, thermal resistance (RθJA = 75 °C/W), and halogen-free RoHS-compliant M3 suffix packaging for high-reliability PCB assembly.
Technical Context
The SMCJ33A-M3/9AT operates as a silicon avalanche diode with glass-passivated junction, delivering fast response time (<1 ns) and low incremental surge resistance to suppress ESD, lightning-induced surges, and inductive switching transients. Its unidirectional configuration provides cathode-banded polarity for DC rail protection.
It is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and supports automated placement due to low-profile SMC package geometry and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse working voltage before clamping begins; defines safe DC operating margin |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - guaranteed avalanche initiation range; ensures consistent turn-on across production lots |
| VC @ IPPM | 53.3 V at 28.1 A - clamped voltage during 1500 W transient; determines protected circuit's maximum stress level |
| PPPM | 1500 W - peak pulse power handling with 10/1000 μs waveform; defines surge energy absorption capability |
| ID @ VWM | 1.0 μA - reverse leakage at 33 V; ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive and industrial environments |
| RθJA | 75 °C/W - thermal resistance junction-to-ambient on standard pad layout; informs derating requirements above 25 °C ambient |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case with matte tin-plated leads; cathode indicated by band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to system ground or lower-potential rail | Provides reference node for clamping; must be routed with low-inductance path to minimize overshoot during surge |
| Cathode | Current exit terminal in forward bias; marked with band; connected to protected line | Defines polarity-sensitive connection point; reverse-biased during normal operation; conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power rating | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V/24 V power buses without derating |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during transients, reducing risk of damage to downstream 3.3 V/5 V logic and analog ICs |
| Halogen-free, RoHS-compliant M3 suffix | Meets automotive and industrial environmental compliance mandates while maintaining solderability and whisker resistance (JESD 201 Class 2) |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, simplifying SMT manufacturing flow |
| 150 °C maximum junction temperature | Supports deployment in engine control units, motor drives, and industrial PLCs with elevated ambient temperatures |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp positive-going surges. Use Value: Limits transient voltage to ≤53.3 V, preventing latch-up or gate oxide damage in MCU power supply inputs. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS mounted at connector interface to shunt fast transients before reaching ADC front-end. Use Value: Sub-1 ns response and <1 μA leakage preserve signal accuracy and prevent false triggering in precision measurement systems. |
| DC Motor Drive Surge Suppression | Telecom Power Supply Input Protection |
Use Scenario: Absorbing inductive kickback from brushed DC motors in factory automation actuators. IC Role / Device Role / Timing Role: TVS placed across motor terminals or H-bridge supply rails to clamp flyback spikes. Use Value: 1500 W rating handles repetitive 50–100 A surge currents typical in 24 V motor commutation cycles. | Use Scenario: Safeguarding AC/DC converter inputs against lightning-induced surges on outdoor telecom equipment. IC Role / Device Role / Timing Role: Primary-stage TVS on rectified DC bus to limit surge propagation into SMPS controller. Use Value: 53.3 V clamping ensures downstream 65 V-rated electrolytics and MOSFETs remain within safe operating area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/61T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VBR/VC | Not suitable for >400 W surge events; limited to low-energy signal-line or USB port protection | Select when board space is constrained and surge threat level is IEC 61000-4-2 only |
| SMCJ33CA-M3/9AT | Bidirectional variant; identical VWM/VBR/VC ratings but symmetrical clamping in both polarities | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where negative transients occur | Choose for bidirectional protection needs; not interchangeable without circuit redesign |
Compared with SMAJ33A-E3/61T and SMCJ33CA-M3/9AT, the SMCJ33A-M3/9AT delivers superior energy handling in the same SMC footprint while maintaining unidirectional polarity - making it optimal for DC power rail protection where high surge immunity and thermal performance are critical.
Availability
SMCJ33A-M3/9AT is available at Aetrix Electronics and suitable for automotive ECU design, industrial motor drive development, and telecom power supply validation requiring stable component supply and full traceability.
Supply support for SMCJ33A-M3/9AT 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, efficiency, and application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered for high-energy transient suppression in harsh environments including automotive, industrial, and telecommunications infrastructure.
FAQ
What is the clamping voltage of the SMCJ33A-M3/9AT at its rated peak pulse current?
The SMCJ33A-M3/9AT clamps to 53.3 V at its rated peak pulse current of 28.1 A (10/1000 μs waveform). This value is measured under standardized test conditions with 0.31" × 0.31" copper pads per terminal and defines the maximum voltage seen by downstream components during a full-rated surge event. The SMCJ33A-M3/9AT maintains this clamping performance across its specified operating temperature range.
Is the SMCJ33A-M3/9AT suitable for automotive applications?
Yes, the SMCJ33A-M3/9AT is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; however, the M3/9AT variant is commercial-grade and not AEC-Q101 certified. For non-automotive-qualified use, it remains widely deployed in automotive subsystems such as body control modules and infotainment power supplies where qualification is not mandated. Always verify qualification status via the full ordering code before automotive production use of SMCJ33A-M3/9AT.
What does the "M3" suffix indicate in SMCJ33A-M3/9AT?
The "M3" suffix in SMCJ33A-M3/9AT denotes halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. It also confirms compliance with UL 94 V-0 flammability rating for the molding compound. This distinguishes it from E3-suffixed variants (RoHS-compliant but not halogen-free) and supports environmentally regulated industrial and consumer designs requiring strict material declarations.
How does the SMCJ33A-M3/9AT differ from the bidirectional SMCJ33CA-M3/9AT?
The SMCJ33A-M3/9AT is unidirectional with cathode band marking and protects only positive-going transients relative to ground, whereas the SMCJ33CA-M3/9AT is bidirectional and suppresses surges of either polarity. Their VWM, VBR, and VC values are identical, but the SMCJ33CA-M3/9AT has no polarity marking and cannot replace SMCJ33A-M3/9AT without verifying circuit symmetry and grounding topology. Both share the same SMC package and thermal characteristics.
What is the maximum reverse leakage current of the SMCJ33A-M3/9AT at its stand-off voltage?
The maximum reverse leakage current (ID) of the SMCJ33A-M3/9AT is 1.0 μA at its 33 V stand-off voltage (VWM) and 25 °C ambient temperature. This low leakage ensures minimal power loss and avoids interference with high-impedance sensing nodes or battery-powered circuits. Leakage increases with temperature but remains below 10 μA up to 85 °C, as confirmed by Vishay's characterization data for the SMCJ family.
SMCJ33A-M3/9AT 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:
- 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-M3/9AT FAQ
1.How can I place an order for SMCJ33A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33A-M3/9AT 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 SMCJ33A-M3/9AT reliable?
The price and inventory of SMCJ33A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ33A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33A-M3/9AT?
SMCJ33A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33A-M3/9AT 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 SMCJ33A-M3/9AT?
For technical support, including SMCJ33A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ33A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ33A-M3/9AT 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 SMCJ33A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ33A-M3/9AT?
All SMCJ33A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33A-M3/9AT, 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 SMCJ33A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ33A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33A-M3/9AT Tags
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