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Vishay General Semiconductor - Diodes Division SMCJ33CA-M3/9AT
- Part No.:
- SMCJ33CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33CA-M3/9AT.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,094
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Product details
Overview
SMCJ33CA-M3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 33 V standoff voltage (VWM), 53.3 V maximum clamping voltage at 28.1 A peak pulse current, and 1500 W peak pulse power dissipation with 10/1000 μs waveform.
For engineers reviewing the SMCJ33CA-M3/9AT datasheet, SMCJ33CA-M3/9AT pinout, SMCJ33CA-M3/9AT application, or SMCJ33CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, low incremental surge resistance, AEC-Q101 qualification eligibility (via HM3 suffix), UL 497B recognition, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: during transient overvoltage events exceeding its breakdown voltage range (36.7–40.6 V at 1 mA test current), it avalanches rapidly to limit the voltage across protected circuitry. Its bidirectional symmetry ensures identical clamping behavior for positive and negative transients without polarity sensitivity.
Thermal performance is defined by junction-to-ambient thermal resistance of 75 °C/W and junction-to-lead resistance of 15 °C/W, enabling reliable operation up to 150 °C junction temperature. The glass-passivated silicon junction delivers sub-nanosecond response time and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on under transient stress. |
| VC @ IPPM | 53.3 V at 28.1 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling capacity; supports high-energy transients like ISO 7637-2 Pulse 5a. |
| ID @ VWM | 1.0 μA - Reverse leakage at rated standoff voltage; negligible loading on 3.3 V or 5 V logic interfaces. |
| TJ max | +150 °C - Maximum junction temperature rating; enables use in under-hood automotive and industrial environments. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height. |
Pinout & Package
SMCJ33CA-M3/9AT uses a 2-terminal SMC (DO-214AB) package with no polarity marking for bidirectional operation. Both terminals are electrically symmetric; neither is designated anode or cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient shunt node | Connected across protected line and return; conducts surge current bidirectionally during overvoltage events. |
| Terminal 2 | Transient shunt node | Electrically identical to Terminal 1; completes low-inductance path for clamping current without polarity dependency. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance for ± transients; eliminates need for polarity-aware layout or external diode pairing. |
| UL 497B recognition | Underwriters Laboratories listed for telecom/data line protection; satisfies safety compliance for field-deployed equipment. |
| Halogen-free & RoHS-compliant | M3 suffix denotes halogen-free molding compound and lead finish; meets environmental requirements for EU and global markets. |
| MSL Level 1 rating | Rated for unlimited floor life and 260 °C peak reflow profile; compatible with standard lead-free SMT assembly processes. |
| Low clamping ratio | VC/VWM = 1.62 - Tight voltage margin between standoff and clamping; preserves headroom for downstream 3.3 V/5 V ICs. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus or 12 V power rail in body control modules from load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt TVS diode placed directly at connector entry point to clamp transients before reaching MCU or transceiver. Use Value: Withstands 1500 W surges and operates up to +150 °C, meeting ISO 16750-2 requirements for automotive environments. |
Use Scenario: Safeguarding analog outputs (4–20 mA) and digital I/O lines of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional clamping element across signal and ground to suppress ESD and switching noise from nearby solenoids or motors. Use Value: 1.0 μA leakage at 33 V avoids measurement drift; 53.3 V clamping protects 24 V-rated op-amps and ADC front-ends. |
| Telecom Data Line Surge Protection | Consumer USB Port ESD Protection |
Use Scenario: Shielding RS-485 transceivers in network infrastructure gear from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary-level TVS mounted at board edge, coordinated with secondary GDT or polymer PTC for staged protection. Use Value: UL 497B listing validates suitability for telecom safety standards; 10/1000 μs waveform rating matches ITU-T K.21 test profiles. |
Use Scenario: Adding robust ESD immunity to USB 2.0 data lines (D+/D−) in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Low-capacitance bidirectional shunt placed adjacent to connector to divert >8 kV HBM ESD pulses. Use Value: Sub-nanosecond response ensures clamping before transceiver damage occurs; SMC package allows compact dual-line layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC33-030 | 33 V VWM, 53 V VC, but rated for only 300 W PPPM and unidirectional configuration. | Limited to lower-energy transients; requires external series resistor or paired device for bidirectional coverage. | Select when cost-sensitive designs tolerate reduced surge margin and can accommodate unidirectional layout constraints. |
| TPSMD33CA | 33 V VWM, 53.3 V VC, same 1500 W rating, but uses SMA package (smaller footprint, higher RθJA = 100 °C/W). | Less thermal robustness in high-power or high-ambient scenarios; not recommended for sustained surge duty cycles. | Choose for space-constrained PCBs where thermal derating is managed via layout or lower duty-cycle operation. |
Compared with SAC33-030 and TPSMD33CA, the SMCJ33CA-M3/9AT provides superior thermal management (RθJA = 75 °C/W), standardized SMC mechanical robustness, and native bidirectional capability-making it optimal for automotive, industrial, and telecom applications demanding full-spectrum transient resilience.
Availability
SMCJ33CA-M3/9AT is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface hardening, and telecom data line surge suppression requiring stable component supply across production lifecycles.
Supply support for SMCJ33CA-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 targets high-energy transient suppression in harsh environments, delivering standardized 1500 W surge capability across 5.0–188 V VWM range in rugged SMC packaging for automotive, industrial, and infrastructure applications.
FAQ
What does the "CA" suffix indicate in SMCJ33CA-M3/9AT?
The "CA" suffix in SMCJ33CA-M3/9AT designates a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMCJ33A), the SMCJ33CA-M3/9AT has no polarity marking and functions identically regardless of voltage polarity applied across its terminals-critical for AC-coupled or differential signal line protection.
Is SMCJ33CA-M3/9AT qualified for automotive applications?
The base SMCJ33CA-M3/9AT is halogen-free and RoHS-compliant but not AEC-Q101 qualified. However, Vishay offers the HM3 variant (e.g., SMCJ33CAHM3_A/I) with full AEC-Q101 qualification for automotive use. Engineers specifying SMCJ33CA-M3/9AT for automotive designs must verify whether the non-qualified version meets their system's reliability and qualification requirements-or select the HM3-suffixed part for certified deployment.
How does the clamping voltage of SMCJ33CA-M3/9AT compare to its standoff voltage?
The SMCJ33CA-M3/9AT has a 33 V standoff voltage (VWM) and a maximum clamping voltage (VC) of 53.3 V at 28.1 A peak pulse current. This 20.3 V headroom ensures protected ICs experience limited overvoltage stress during transients. The clamping ratio (VC/VWM = 1.62) reflects efficient energy diversion-lower than many competing TVS diodes-and helps preserve timing margins and logic integrity in 3.3 V or 5 V systems.
Can SMCJ33CA-M3/9AT be used in parallel for higher surge current handling?
No-SMCJ33CA-M3/9AT is not designed for parallel operation due to parameter variation between units, which causes current imbalance and potential thermal runaway. For higher surge ratings, Vishay specifies single-device solutions (e.g., SMCJ36CA for 36 V VWM) or recommends coordinated multi-stage protection using upstream GDTs or PTCs. Parallel use of SMCJ33CA-M3/9AT violates manufacturer guidance and voids reliability guarantees.
What is the significance of the "M3" and "9AT" in SMCJ33CA-M3/9AT?
The "M3" suffix in SMCJ33CA-M3/9AT indicates halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. The "9AT" denotes packaging in 13-inch diameter plastic tape and reel, containing 3500 units-optimized for high-volume SMT assembly. Together, they define environmental compliance and logistics format, distinct from E3 (standard RoHS) or HE3/HM3 (AEC-Q101 qualified) variants.
SMCJ33CA-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:
- -
- 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-M3/9AT FAQ
1.How can I place an order for SMCJ33CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33CA-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 SMCJ33CA-M3/9AT reliable?
The price and inventory of SMCJ33CA-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 SMCJ33CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ33CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33CA-M3/9AT?
SMCJ33CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33CA-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 SMCJ33CA-M3/9AT?
For technical support, including SMCJ33CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ33CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ33CA-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 SMCJ33CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ33CA-M3/9AT?
All SMCJ33CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33CA-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 SMCJ33CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ33CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33CA-M3/9AT Tags
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