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Vishay General Semiconductor - Diodes Division SMCJ30CA-M3/57T
- Part No.:
- SMCJ30CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30CA-M3/57T.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,844
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Product details
Overview
SMCJ30CA-M3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on power and signal lines. It features a 30 V stand-off voltage (VWM), 48.4 V maximum clamping voltage (VC) at 31.0 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive power supply rails and industrial sensor interfaces.
For engineers reviewing the SMCJ30CA-M3/57T datasheet, SMCJ30CA-M3/57T pinout, SMCJ30CA-M3/57T application, or SMCJ30CA-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 mm × 8 mm copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transients: when reverse voltage exceeds its breakdown range (33.3–36.8 V at 1 mA), it avalanches to limit downstream voltage to ≤48.4 V. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response (<1 ns), critical for protecting MOSFET gates and CAN/LIN bus transceivers.
The SMCJ30CA-M3/57T uses a symmetrical bidirectional structure - no polarity marking - enabling identical clamping in both directions. Thermal performance is defined by RθJA = 75 °C/W and RθJL = 15 °C/W, supporting operation from –55 °C to +150 °C junction temperature with derating above 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC working margin. |
| VBR min/max | 33.3 V / 36.8 V at 1 mA - guaranteed avalanche onset range; ensures consistent turn-on across production lots. |
| VC @ IPPM | 48.4 V at 31.0 A - clamped voltage under 10/1000 µs surge; determines maximum stress on protected ICs. |
| PPPM | 1500 W - peak transient energy absorption capacity; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage at rated stand-off; minimizes standby power loss in battery-powered systems. |
| TJ max | +150 °C - maximum junction temperature; supports under-hood automotive and high-temperature industrial environments. |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; optimized for reflow and wave soldering. |
Pinout & Package
SMCJ30CA-M3/57T is housed in an SMC (DO-214AB) plastic package with two terminals: Cathode and Anode. As a bidirectional TVS, it has no polarity marking and functions identically in either orientation - both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Surge Input/Output Node | Connected across protected line and ground (or rail); conducts bidirectionally during overvoltage events. |
| Terminal 2 | Surge Input/Output Node | Electrically identical to Terminal 1; no cathode/anode distinction - enables flexible PCB layout without polarity constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both polarities - eliminates need for orientation-aware placement in AC-coupled or differential lines. |
| 1500 W peak pulse rating | Withstands 10/1000 µs surges up to 31.0 A - meets IEC 61000-4-5 surge immunity requirements for industrial and automotive applications. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage over temperature and lifetime - critical for long-term reliability in harsh environments. |
| Halogen-free, RoHS-compliant (M3) | Meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability - suitable for green manufacturing and safety-critical systems. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60 % RH - supports standard SMT assembly without baking or dry-pack requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping element placed between power input and DC/DC converter input stage. Use Value: Limits transient voltage to ≤48.4 V, preventing damage to downstream regulators and microcontrollers during 100 V/50 ms load dump events. |
Use Scenario: Shielding 4–20 mA current loop transmitters from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional shunt clamp on analog signal pair (e.g., IN+/IN−) referenced to local ground. Use Value: Maintains signal integrity below 1.0 µA leakage at 30 V, while clamping ±30 kV contact ESD per IEC 61000-4-2 with sub-ns response. |
| Telecom DC Power Feeds | Consumer USB Port Surge Suppression |
|
Use Scenario: Safeguarding PoE-powered devices (e.g., IP cameras) against lightning-induced surges on 48 V DC lines. IC Role / Device Role / Timing Role: Secondary-level TVS mounted upstream of PoE controller ICs and Ethernet magnetics. Use Value: Absorbs 1500 W transient energy without degradation, ensuring compliance with IEEE 802.3bt surge immunity requirements. |
Use Scenario: Adding robustness to USB 2.0 data lines (D+/D−) in portable chargers and docking stations. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed directly at USB connector pins. Use Value: Provides <1.0 µA leakage at 30 V stand-off while clamping ±15 kV air discharge ESD - preserving signal rise time and eye diagram integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA-E3/61 | Same VWM (30 V), lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W). | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 or automotive load dump. | Select when board space is constrained and surge threat level is ≤IEC 61000-4-2 ESD only. |
| SMCJ33CA-M3/57T | Higher VWM (33 V), VBR (36.7–40.6 V), VC (53.3 V); otherwise identical SMC package and 1500 W rating. | Better margin for 3.3 V logic rails with tighter VWM tolerance; slightly higher clamping voltage reduces protection headroom. | Choose for 3.3 V systems where 30 V VWM risks false triggering near nominal rail voltage. |
Compared with SMCJ30CA-M3/57T, SMAJ30CA-E3/61 trades surge capability for size, while SMCJ33CA-M3/57T offers higher stand-off voltage at the cost of elevated clamping - requiring system-level validation of protected IC's absolute maximum ratings.
Availability
SMCJ30CA-M3/57T is available at Aetrix Electronics and suitable for automotive power distribution modules, industrial PLC I/O cards, telecom DC power supplies, and consumer USB-C port protection requiring stable component supply and halogen-free compliance.
Supply support for SMCJ30CA-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, and protection devices with emphasis on reliability, thermal performance, and automotive-grade qualification.
The SMCJ series was developed for high-power transient suppression in demanding environments - targeting automotive, industrial, and telecom infrastructure where 1500 W surge handling and AEC-Q101 readiness are mandatory.
FAQ
What is the clamping voltage of SMCJ30CA-M3/57T under a 10/1000 µs surge?
The SMCJ30CA-M3/57T clamps to a maximum of 48.4 V when subjected to its rated peak pulse current of 31.0 A using a 10/1000 µs waveform. This value is measured at the device terminals under standardized test conditions with 0.31" × 0.31" copper pads per terminal, and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMCJ30CA-M3/57T suitable for automotive applications?
Yes - the SMCJ30CA-M3/57T is halogen-free and RoHS-compliant (M3 suffix), and belongs to the AEC-Q101-qualified SMCJ family. While the base M3 variant is commercial-grade, ordering codes with HM3 suffix (e.g., SMCJ30CAHM3_X) are explicitly AEC-Q101 qualified. System designers must specify HM3 for automotive use to ensure full qualification documentation and process control.
How does the bidirectional design of SMCJ30CA-M3/57T affect PCB layout?
The bidirectional nature of SMCJ30CA-M3/57T eliminates polarity constraints: no cathode band marking is present, and both terminals function identically. This allows placement across AC-coupled lines, differential pairs, or ungrounded rails without orientation checks - simplifying layout, reducing assembly errors, and enabling reuse across symmetric protection schemes like RS-485 or CAN bus termination networks.
What is the thermal resistance of SMCJ30CA-M3/57T, and how does it impact power dissipation?
The SMCJ30CA-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. At 25 °C ambient, its steady-state power dissipation is limited to 6.5 W; however, this derates linearly above 25 °C - reaching ~3.3 W at 75 °C ambient. Effective copper pad area (8 mm × 8 mm per terminal) is required to achieve published ratings.
Does SMCJ30CA-M3/57T meet any international surge immunity standards?
The SMCJ30CA-M3/57T's 1500 W peak pulse power rating with 10/1000 µs waveform aligns with the energy requirements of IEC 61000-4-5 (Level 4: 4 kV line-earth, 2 kV line-line) when applied with appropriate series impedance. It is also used in designs meeting ISO 7637-2 (Pulse 1, 2a, 3a/b) and IEC 61000-4-2 (ESD) - though system-level testing is required to validate full compliance.
SMCJ30CA-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):
- 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-M3/57T FAQ
1.How can I place an order for SMCJ30CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30CA-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 SMCJ30CA-M3/57T reliable?
The price and inventory of SMCJ30CA-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 SMCJ30CA-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ30CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30CA-M3/57T?
SMCJ30CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30CA-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 SMCJ30CA-M3/57T?
For technical support, including SMCJ30CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30CA-M3/57T requirements.
6.How does Aetrix verify that SMCJ30CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ30CA-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 SMCJ30CA-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ30CA-M3/57T?
All SMCJ30CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30CA-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 SMCJ30CA-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ30CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30CA-M3/57T Tags
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