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Vishay General Semiconductor - Diodes Division SMCJ30CA/57T
- Part No.:
- SMCJ30CA/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30CA/57T.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,021
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Product details
Overview
SMCJ30CA/57T from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. 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 dissipation (PPPM) with 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial I/O modules.
For engineers reviewing the SMCJ30CA/57T datasheet, SMCJ30CA/57T pinout, SMCJ30CA/57T application, or SMCJ30CA/57T equivalent, key selection criteria include verified bi-directional clamping performance, AEC-Q101 qualification for automotive use, DO-214AB mechanical compatibility, and thermal resistance (RθJA = 75 °C/W) under standard PCB pad layout.
Technical Context
The SMCJ30CA/57T operates as a voltage-clamped shunt protector: when transient voltage exceeds its breakdown range (33.3–36.8 V at 1 mA test current), it avalanches to divert surge current away from downstream circuitry. Its bi-directional symmetry ensures identical clamping behavior in both polarities, eliminating polarity marking and simplifying layout in AC-coupled or floating interfaces.
Designed for high-energy transients, it sustains 1500 W peak pulse power per 10/1000 µs waveform with low incremental surge resistance and fast response time (<1 ns). Thermal performance is characterized by RθJA = 75 °C/W (on 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, enabling reliable operation up to TJ = +150 °C.
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 IT = 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 48.4 V at 31.0 A - Clamped voltage during full-rated 10/1000 µs surge; determines maximum stress on protected ICs. |
| PPPM | 1500 W - Peak transient energy handling capacity; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity design. |
| ID @ VWM | 1.0 µA - Reverse leakage at stand-off voltage; negligible power loss and signal integrity impact in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature rating; enables deployment in under-hood automotive and industrial environments. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bi-directional construction means no polarity marking; terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Bi-directional conduction: either terminal serves as anode or cathode depending on transient polarity; no orientation required during placement. |
| Case (cathode band absent) | Thermal and mechanical interface | DO-214AB body provides thermal path to PCB copper; absence of band confirms bi-directional configuration per Vishay marking convention. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Identical VBR and VC in both directions - eliminates polarity concerns in AC, differential, or floating signal paths. |
| AEC-Q101 qualification | Validated for automotive under-hood applications including temperature cycling, high-temp reverse bias, and mechanical shock. |
| Low incremental surge resistance | Enables tighter VC control under high IPPM - reduces voltage overshoot during fast-rising transients like ISO 7637-2 pulses. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning - supports automated SMT assembly without moisture sensitivity risk. |
| Glass passivated junction | Enhances long-term stability and reliability under humidity and thermal stress - critical for industrial field-deployed equipment. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-supplied microcontrollers and CAN transceivers from load-dump and jump-start transients in vehicle body control modules. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at power entry point before LDO or DC/DC converter input. Use Value: Clamps 30 V nominal rail to ≤48.4 V during 1500 W surges, preventing latch-up or permanent damage to downstream logic and analog circuitry. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA current loops) and digital sensor interfaces (I²C, SPI) in factory automation PLC I/O cards. IC Role / Device Role / Timing Role: Bi-directional TVS placed across differential or single-ended signal pairs to absorb ESD and inductive switching noise. Use Value: Sub-1 ns response and symmetric clamping ensure signal integrity preservation while meeting IEC 61000-4-2 Level 4 (15 kV air) and IEC 61000-4-4 (4 kV) immunity requirements. |
| Telecom Interface Surge Protection | Consumer Device USB/Power Port Protection |
Use Scenario: Shielding Ethernet PHYs and PoE injectors from lightning-induced surges on outdoor telecom line cards and base station backhaul interfaces. IC Role / Device Role / Timing Role: Primary-level TVS on RJ45 transformer center taps and DC feed lines, coordinated with secondary GDT or polymer PTC. Use Value: 1500 W PPPM rating supports coordination with upstream gas discharge tubes for multi-stage IEC 61000-4-5 compliance up to 10/700 µs waveforms. |
Use Scenario: Hardening USB-C power delivery inputs and HDMI hot-plug detection lines against user-handling ESD and adapter-induced transients in smart displays and docking stations. IC Role / Device Role / Timing Role: Bi-directional clamp on VBUS and CC lines to limit voltage excursions during plug insertion, cable discharge events, and adapter fault conditions. Use Value: 30 V VWM aligns with USB PD 3.0 20 V max, while 48.4 V VC prevents overvoltage damage to USB PD controllers and level shifters during 8 kV contact ESD. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA | Lower PPPM (400 W), smaller DO-214AC (SMA) package, higher RθJA (~125 °C/W). | Suitable only for lower-energy transients (IEC 61000-4-2 Level 2); limited thermal margin in high-power density layouts. | Select SMAJ30CA only if space-constrained and surge threat level is confirmed ≤400 W. |
| SMCJ33CA | Higher VWM (33 V), VBR (36.7–40.6 V), and VC (53.3 V); same PPPM (1500 W) and DO-214AB package. | Better margin for 3.3 V logic rails with higher supply tolerance; less suitable for strict 30 V nominal systems. | Choose SMCJ33CA when protecting 3.3 V systems with >3 V headroom or where tighter VWM tolerance is required. |
Compared with SMCJ30CA/57T, SMAJ30CA trades surge capability for footprint reduction, while SMCJ33CA offers higher voltage margin at the cost of elevated clamping - making SMCJ30CA/57T optimal for 30 V nominal systems requiring full 1500 W immunity without overdesign.
Availability
SMCJ30CA/57T is available at Aetrix Electronics and suitable for automotive ECU power protection, industrial I/O surge hardening, and telecom interface transient suppression requiring stable component supply, RoHS-compliant sourcing, and AEC-Q101 traceability.
Supply support for SMCJ30CA/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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure applications demanding AEC-Q101 validation and repeatable clamping performance.
FAQ
What is the clamping voltage of SMCJ30CA/57T under maximum rated surge current?
The SMCJ30CA/57T has a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak pulse current (IPPM) of 31.0 A using the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 11-Dec-12, ensuring predictable overvoltage limiting for protected circuitry.
Is SMCJ30CA/57T suitable for automotive applications?
Yes, SMCJ30CA/57T is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its thermal performance (TJ max = +150 °C), mechanical robustness, and validated reliability testing - such as temperature cycling and high-temperature reverse bias - make it appropriate for engine control units, body electronics, and ADAS power domains.
Does SMCJ30CA/57T have polarity markings on the package?
No, SMCJ30CA/57T is a bi-directional TVS diode and carries no cathode band or polarity marking on the DO-214AB (SMCJ) case. Its symmetrical construction allows installation in either orientation, simplifying PCB layout and reducing assembly errors - a key advantage over uni-directional variants like SMCJ30A.
What is the maximum reverse leakage current for SMCJ30CA/57T at its stand-off voltage?
The SMCJ30CA/57T exhibits a maximum reverse leakage current (ID) of 1.0 µA when biased at its rated stand-off voltage (VWM) of 30 V, measured at TA = 25 °C. This ultra-low leakage ensures minimal power loss and avoids interference in high-impedance sensing or battery-powered circuits where quiescent current matters.
What packaging format does SMCJ30CA/57T ship in?
SMCJ30CA/57T ships in 7-inch diameter plastic tape and reel format (package code 57T), with a base quantity of 850 units per reel. The tape conforms to EIA-481 standards and supports high-speed pick-and-place assembly; lead finish is matte tin, compliant with J-STD-002 and JESD 22-B102 solderability requirements.
SMCJ30CA/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:
- Obsolete
- 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 (SMCJ)
SMCJ30CA/57T FAQ
1.How can I place an order for SMCJ30CA/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30CA/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/57T reliable?
The price and inventory of SMCJ30CA/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/57T is usually 5 days.
3.What payment methods are accepted for SMCJ30CA/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30CA/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30CA/57T?
SMCJ30CA/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30CA/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/57T?
For technical support, including SMCJ30CA/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30CA/57T requirements.
6.How does Aetrix verify that SMCJ30CA/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ30CA/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/57T meets industry standards.
7.What is the process for return or replacement of SMCJ30CA/57T?
All SMCJ30CA/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30CA/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/57T part is unused and in its original packaging.
Return procedure for SMCJ30CA/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30CA/57T Tags
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