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Vishay General Semiconductor - Diodes Division SMCJ30CA-M3/9AT
- Part No.:
- SMCJ30CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30CA-M3/9AT.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,918
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Product details
Overview
SMCJ30CA-M3/9AT 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 48.4 V clamping voltage at 31.0 A peak pulse current and 30 V standoff voltage. It protects sensitive signal lines and power rails in automotive sensor interfaces, industrial I/O modules, and telecom surge-prone ports.
For engineers reviewing the SMCJ30CA-M3/9AT datasheet, SMCJ30CA-M3/9AT pinout, SMCJ30CA-M3/9AT application, or SMCJ30CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, 1500 W 10/1000 µs surge rating, 30 V working voltage, and halogen-free RoHS-compliant M3 termination - critical for automotive-grade ESD/EFT robustness and PCB assembly compatibility.
Technical Context
The SMCJ30CA-M3/9AT operates as a bidirectional avalanche diode with symmetrical breakdown characteristics in both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR (33.3–36.8 V) and low incremental surge resistance under repetitive transient stress.
Thermally, it features RθJA = 75 °C/W and RθJL = 15 °C/W, supporting operation from –55 °C to +150 °C junction temperature. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 when ordered with HE3/HM3 suffixes - though SMCJ30CA-M3/9AT itself is commercial-grade halogen-free.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - sustains high-energy lightning-induced surges on power/signal lines without failure |
| Standoff Voltage (VWM) | 30 V - blocks normal operating voltages while remaining inactive until transients exceed threshold |
| Clamping Voltage (VC @ IPPM) | 48.4 V - limits downstream IC voltage to safe level during 31.0 A transient event |
| Breakdown Voltage (VBR) | 33.3–36.8 V @ 1.0 mA - defines precise avalanche initiation range for repeatable protection behavior |
| Package | SMC (DO-214AB) - industry-standard 2-pin surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal requirement |
| Operating Temperature | –55 °C to +150 °C - supports under-hood automotive, industrial control, and outdoor telecom environments |
| RoHS Compliance | Halogen-free, RoHS-compliant (M3 suffix) - satisfies environmental compliance for global manufacturing and end-of-life handling |
Pinout & Package
SMCJ30CA-M3/9AT uses the SMC (DO-214AB) package: a 2-terminal, non-polarized surface-mount case with matte tin-plated leads solderable per J-STD-002. Bidirectional construction means no cathode/anode marking; terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as input/output path for transient energy - no polarity dependency in layout |
| Terminal 2 | Anode / Cathode (bidirectional) | Paired terminal completing low-inductance clamping loop across protected line and ground or rail |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity concerns |
| 1500 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 (4 kV surge) on 2 Ω source impedance with margin |
| Glass-passivated junction | Ensures long-term VBR stability and low leakage (<1.0 µA @ 30 V) over temperature and lifetime |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - reduces manufacturing overhead |
| Halogen-free (M3) | Meets IPC-4101D/21 and EU Directive 2011/65/EU Annex II requirements for flame-retardant PCB assemblies |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Module |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver signal pins and microcontroller GPIOs from load-dump and inductive switching transients in engine control units. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and chassis ground to clamp ±40 V transients within 1 ns response time. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V MCUs by limiting voltage to ≤48.4 V during 31 A surge events. | Use Scenario: Shielding 24 V DC digital input circuits in PLC backplanes from field-wiring induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input optocoupler terminals to absorb 1500 W transients without degrading isolation barrier integrity. Use Value: Maintains functional safety integrity by ensuring input stage survives repeated 1 kV/500 A surge tests per IEC 61000-4-4. |
| Telecom Line Interface | Consumer USB Port Protection |
Use Scenario: Safeguarding Ethernet PHY differential pairs and PoE injectors against lightning-induced common-mode surges on outdoor network drops. IC Role / Device Role / Timing Role: Bidirectional TVS mounted across each twisted pair to clamp mode-common transients while preserving signal integrity up to 100 MHz. Use Value: Enables compliance with GR-1089-CORE Section 4.5.2.2 (lightning immunity) without adding series impedance or signal distortion. | Use Scenario: Adding secondary-level surge suppression on USB 2.0 VBUS and D+/D− lines in set-top boxes exposed to user-handling ESD and adapter ripple. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ < 100 pF) shunting transient energy away from USB controller ESD diodes during hot-plug events. Use Value: Extends system-level ESD immunity beyond IEC 61000-4-2 Level 4 (±15 kV air/±8 kV contact) without compromising 480 Mbps data rate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA-E3/61T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VC | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 3+ or automotive load-dump | Select when board space is constrained and surge threat level is ≤400 W (e.g., internal logic rails) |
| SMCJ33CA-M3/9AT | Higher VWM (33 V), VBR min/max 36.7–40.6 V, identical package and PPPM | Better margin for 33 V systems but less headroom for 30 V nominal rails near tolerance limits | Prefer for 33 V industrial power supplies where tighter VWM tolerance avoids false triggering |
Compared with SMCJ30CA-M3/9AT, SMAJ30CA-E3/61T trades surge capacity for compactness, while SMCJ33CA-M3/9AT offers higher standoff voltage at identical form factor - making SMCJ30CA-M3/9AT optimal for 30 V nominal systems requiring full 1500 W immunity.
Availability
SMCJ30CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and telecom line interface designs requiring stable component supply, halogen-free compliance, and MSL Level 1 reflow readiness.
Supply support for SMCJ30CA-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, thermal performance, and automotive qualification.
The SMCJ series targets high-energy transient suppression in harsh environments, with design focus on clamping consistency, surge endurance, and manufacturability for automated SMT assembly in automotive, industrial, and infrastructure applications.
FAQ
What is the clamping voltage of SMCJ30CA-M3/9AT at its rated peak pulse current?
The SMCJ30CA-M3/9AT has a maximum clamping voltage (VC) of 48.4 V at its rated peak pulse current (IPPM) of 31.0 A, measured under the standardized 10/1000 µs double-exponential waveform. This value ensures downstream components see no more than 48.4 V during worst-case surge events, directly protecting 3.3 V or 5 V logic interfaces when used with appropriate series impedance.
Is SMCJ30CA-M3/9AT suitable for automotive applications requiring AEC-Q101 qualification?
SMCJ30CA-M3/9AT is not AEC-Q101 qualified; it carries the commercial-grade M3 suffix. For automotive use, Vishay offers the HM3 variant (e.g., SMCJ30CAHM3_A/I), which adds AEC-Q101 qualification while retaining identical electrical specs and SMC package. Always verify qualification status via the full ordering code before deployment in automotive ECUs or ADAS modules.
How does the bidirectional nature of SMCJ30CA-M3/9AT affect PCB layout compared to unidirectional TVS diodes?
The bidirectional structure of SMCJ30CA-M3/9AT eliminates polarity marking and orientation constraints - either terminal connects to the protected line and the other to ground or return path. Unlike unidirectional TVS diodes (e.g., SMCJ30A), no cathode band alignment is needed, simplifying automated placement and reducing assembly errors in differential or AC-coupled circuits.
What is the thermal resistance from junction to ambient for SMCJ30CA-M3/9AT, and how does it impact power derating?
SMCJ30CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 8.0 mm × 8.0 mm copper pads. At 70 °C ambient, this limits continuous power dissipation to ~2.6 W before reaching the 150 °C max junction temperature - confirming its role as a transient-only device, not for sustained overvoltage regulation.
Does SMCJ30CA-M3/9AT meet lead-free and halogen-free compliance standards?
Yes, SMCJ30CA-M3/9AT is halogen-free and RoHS-compliant per the M3 suffix definition in Vishay's ordering guide. It contains no brominated flame retardants or chlorine-based compounds, satisfies IPC-4101D/21 requirements, and uses matte tin-plated leads compatible with Pb-free reflow profiles up to 260 °C peak.
SMCJ30CA-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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMCJ30CA-M3/9AT FAQ
1.How can I place an order for SMCJ30CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30CA-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 SMCJ30CA-M3/9AT reliable?
The price and inventory of SMCJ30CA-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 SMCJ30CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ30CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30CA-M3/9AT?
SMCJ30CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30CA-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 SMCJ30CA-M3/9AT?
For technical support, including SMCJ30CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ30CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ30CA-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 SMCJ30CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ30CA-M3/9AT?
All SMCJ30CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30CA-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 SMCJ30CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ30CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30CA-M3/9AT Tags
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