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Vishay General Semiconductor - Diodes Division SMCJ30A-E3/57T
- Part No.:
- SMCJ30A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30A-E3/57T.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,664
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Product details
Overview
SMCJ30A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features a 30 V stand-off voltage (VWM), 33.3–36.8 V breakdown voltage (VBR) at 1 mA, 48.4 V maximum clamping voltage (VC) at 31 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive power rail protection and industrial sensor interface circuits.
For engineers reviewing the SMCJ30A-E3/57T datasheet, SMCJ30A-E3/57T pinout, SMCJ30A-E3/57T application, or SMCJ30A-E3/57T equivalent, key selection criteria include unidirectional polarity, 1.0 μA max reverse leakage at VWM, -55 °C to +150 °C operating junction temperature, RoHS-compliant matte tin-plated leads, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and low incremental surge resistance, enabling fast response (<1 ns) to ESD and lightning-induced surges.
The SMCJ30A-E3/57T is rated for 1500 W peak pulse power under standardized 10/1000 μs waveform, with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), supporting reliable operation on 8.0 mm × 8.0 mm copper pads per terminal without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR min/max | 33.3 V / 36.8 V at IT = 1 mA - Confirmed breakdown window ensures predictable turn-on behavior across production lot. |
| VC @ IPPM | 48.4 V at 31 A - Clamping voltage during 1500 W transient event; limits downstream IC stress to safe levels. |
| ID @ VWM | ≤1.0 μA - Ultra-low leakage preserves system power integrity in battery-powered or high-impedance sensing nodes. |
| PPPM | 1500 W - Peak surge handling capacity per 10/1000 μs waveform; meets IEC 61000-4-5 Level 4 requirements. |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments and industrial enclosures without derating. |
| Package | SMC (DO-214AB) - Surface-mount outline with 0.320" x 0.246" footprint; compatible with automated pick-and-place and reflow. |
Pinout & Package
SMCJ30A-E3/57T uses the standard SMC (DO-214AB) package: cathode-indicated by a band on one end; anode at opposite end. Leads are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, with MSL level 1 rating (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connects to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode (non-banded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables compact PCB layout in space-constrained modules such as ADAS camera ECUs and motor control boards. |
| Glass-passivated junction | Ensures long-term VBR stability and reduced parameter drift over temperature and lifetime cycling. |
| 1500 W peak pulse power | Withstands severe transients like ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems without failure. |
| AEC-Q101 qualification path | E3 suffix supports commercial-grade use; HE3 suffix variant enables automotive-grade qualification per stress test requirements. |
| MSL Level 1 moisture sensitivity | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and process complexity. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply lines in body control modules against load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional clamping device placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤48.4 V, preventing damage to downstream LDOs and microcontrollers rated for 40 V absolute maximum. |
Use Scenario: Safeguarding analog outputs of pressure sensors connected to PLC analog input cards. IC Role / Device Role / Timing Role: Standoff-mode protector on 4–20 mA current loop output lines exposed to field wiring ESD. Use Value: 1.0 μA leakage at 30 V ensures minimal error contribution to precision current-loop accuracy (±0.1% FS). |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Shielding Ethernet PHY power rails (3.3 V/5 V) from induced surges on adjacent AC mains traces in multi-port switches. IC Role / Device Role / Timing Role: Secondary-level TVS placed after primary MOV protection to handle fast-rising ringwave transients. Use Value: <1 ns response time captures sub-microsecond edges missed by slower bulk protectors, improving immunity to IEC 61000-4-4 EFT. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in smart home vacuum cleaners and robotic mowers. IC Role / Device Role / Timing Role: Freewheeling clamp across motor terminals to absorb stored inductive energy during PWM switching. Use Value: 200 A non-repetitive forward surge rating handles repeated commutation spikes without degradation over 10,000+ cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A-E3/61 | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VBR/VC ratings. | Limited to lower-energy transients; unsuitable for automotive load dump or industrial 2 kV surge testing. | Select when board space is critical and surge threat level is restricted to IEC 61000-4-2 ±8 kV contact discharge only. |
| SMCJ30CA-E3/57T | Bidirectional version; identical VWM (30 V), symmetric VBR (±33.3–36.8 V), same PPPM/VC/IPPM ratings. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus) where reverse polarity transients occur. | Choose bidirectional SMCJ30CA-E3/57T only if protecting balanced differential interfaces or AC power inputs. |
Compared with SMAJ30A-E3/61, SMCJ30A-E3/57T delivers 3.75× higher surge power handling and superior thermal dissipation; versus SMCJ30CA-E3/57T, it offers lower capacitance and avoids unnecessary bidirectional conduction in DC-only rails - optimizing clamping efficiency and leakage performance.
Availability
SMCJ30A-E3/57T is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, telecom infrastructure, and consumer appliance designs requiring stable component supply and full traceability.
Supply support for SMCJ30A-E3/57T 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, ruggedness, and automotive-grade qualification.
The SMCJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ISO 7637, IEC 61000-4-5, and AEC-Q101 stress profiles is mandatory.
FAQ
What is the maximum clamping voltage of the SMCJ30A-E3/57T under a 10/1000 µs surge?
The SMCJ30A-E3/57T has a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak pulse current of 31 A under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's Document Number 88394, ensuring predictable overvoltage limiting for downstream circuitry. The SMCJ30A-E3/57T maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is the SMCJ30A-E3/57T suitable for automotive applications?
Yes - the SMCJ30A-E3/57T is RoHS-compliant and manufactured using processes qualified to AEC-Q101 when ordered with the HE3 suffix (e.g., SMCJ30AHE3_A). While the E3/57T variant itself is commercial-grade, its construction - including glass-passivated junction, MSL Level 1 rating, and -55 °C to +150 °C TJ range - aligns with automotive environmental requirements. The SMCJ30A-E3/57T is widely deployed in body electronics and infotainment power rails where load dump and jump-start transients occur.
How does the SMCJ30A-E3/57T differ from the bidirectional SMCJ30CA-E3/57T?
The SMCJ30A-E3/57T is unidirectional, with polarity marked by a cathode band and optimized for DC power line protection; the SMCJ30CA-E3/57T is bidirectional, lacking polarity marking and rated for symmetrical clamping in AC or differential signal paths. Both share identical VWM (30 V), VBR (±33.3–36.8 V), VC (48.4 V), and PPPM (1500 W), but the SMCJ30A-E3/57T exhibits lower junction capacitance and zero reverse conduction in normal operation - making it preferable for DC bias applications. The SMCJ30A-E3/57T also avoids unnecessary leakage in single-polarity systems.
What is the thermal resistance of the SMCJ30A-E3/57T, and how does it affect PCB layout?
The SMCJ30A-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This means effective heat dissipation requires adherence to Vishay's recommended pad layout - undersized pads increase RθJA and risk exceeding the +150 °C maximum junction temperature during repetitive surges. The SMCJ30A-E3/57T does not require heatsinking for single-event transients but benefits from thermal relief in high-duty-cycle applications.
Can the SMCJ30A-E3/57T replace older P6KE30A or 1.5KE30A through-hole TVS diodes?
No direct drop-in replacement exists due to package and mounting differences: the SMCJ30A-E3/57T is surface-mount (SMC/DO-214AB), while P6KE30A and 1.5KE30A are axial-lead (DO-15/DO-201AD). Though electrical specs (VWM = 30 V, VC ≈ 48.4 V) are closely matched, PCB redesign is required. The SMCJ30A-E3/57T offers superior surge capability (1500 W vs. 600 W for P6KE30A), faster response, and automated assembly compatibility - but migration necessitates layout revision and requalification per IEC 61000-4-5 test plans. The SMCJ30A-E3/57T is not a pin-compatible substitute.
SMCJ30A-E3/57T 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ30A-E3/57T FAQ
1.How can I place an order for SMCJ30A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30A-E3/57T 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 SMCJ30A-E3/57T reliable?
The price and inventory of SMCJ30A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ30A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30A-E3/57T?
SMCJ30A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30A-E3/57T 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 SMCJ30A-E3/57T?
For technical support, including SMCJ30A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30A-E3/57T requirements.
6.How does Aetrix verify that SMCJ30A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ30A-E3/57T 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 SMCJ30A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ30A-E3/57T?
All SMCJ30A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30A-E3/57T, 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 SMCJ30A-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ30A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30A-E3/57T Tags
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