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Vishay General Semiconductor - Diodes Division SMCJ30-E3/57T
- Part No.:
- SMCJ30-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30-E3/57T.pdf
- Description:
- TVS DIODE 30VWM 53.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,170
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Product details
Overview
SMCJ30-E3/57T from Vishay General Semiconductor is a unidirectional 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 - ideal for safeguarding power rails and signal lines in automotive ECUs and industrial motor drives.
For engineers reviewing the SMCJ30-E3/57T datasheet, SMCJ30-E3/57T pinout, SMCJ30-E3/57T application, or SMCJ30-E3/57T equivalent, key selection criteria include verified clamping performance under 31 A surge, unidirectional polarity with cathode band marking, RoHS-compliant E3 termination, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
The SMCJ30-E3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering sub-nanosecond response to transients. Its breakdown voltage (VBR) is specified at 33.3–36.8 V (min/max) with 1 mA test current, ensuring precise triggering above 30 V nominal system voltage while maintaining low leakage (<1.0 µA at VWM).
Thermally, it supports junction temperatures from –55 °C to +150 °C, with typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W on recommended 8.0 mm × 8.0 mm copper pads - enabling reliable operation without forced cooling in space-constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 33.3 V / 36.8 V - guaranteed avalanche breakdown range at 1 mA, defining turn-on threshold |
| VC @ IPPM | 48.4 V - clamped voltage during 31.0 A 10/1000 µs surge, limiting stress on downstream ICs |
| PPPM | 1500 W - peak transient power handling capability per standardized waveform |
| ID @ VWM | <1.0 µA - ultra-low reverse leakage ensures minimal standby power loss |
| TJ max. | +150 °C - extended thermal rating enables use in under-hood automotive environments |
| Package | DO-214AB (SMCJ) - surface-mount outline with J-bend leads, compatible with automated placement |
Pinout & Package
DO-214AB (SMCJ) package with matte tin-plated J-bend leads; polarity indicated by cathode band on one end. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per JEDEC standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lower-potential rail; conducts during positive transients when cathode is biased higher |
| Cathode | High-side transient input | Marked with band; connected to protected line (e.g., 30 V supply); avalanches into conduction when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
| JESD 201 Class 1A whisker resistance | Ensures mechanical reliability of matte tin terminations in high-vibration environments |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive I/O Protection |
|---|---|
Use Scenario: Protecting 24 V/30 V battery-supplied microcontrollers and CAN transceivers from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VCC and GND, clamping surges within 1 ns to prevent latch-up or gate oxide damage. Use Value: With 48.4 V clamping at 31 A, SMCJ30-E3/57T limits stress on 3.3 V/5 V logic supplies downstream of DC-DC converters. | Use Scenario: Shielding analog inputs and encoder feedback lines in servo drives from inductive switching noise. IC Role / Device Role / Timing Role: Mounted at connector entry points to shunt EFT bursts (IEC 61000-4-4) and surge events (IEC 61000-4-5) to chassis ground. Use Value: 1500 W PPPM rating sustains repeated 1 kV/500 A surges without degradation, supporting 10-year field life in factory automation. |
| Telecom DC Power Input Protection | Consumer Appliance Control Board Protection |
Use Scenario: Safeguarding PoE-powered Ethernet switches and base station RF modules against lightning-induced surges on 48 V DC inputs. IC Role / Device Role / Timing Role: First-line defense in series with upstream fuse and parallel to bulk capacitance, absorbing energy before it reaches DC-DC regulators. Use Value: 30 V VWM aligns with IEEE 802.3af/at hold-up requirements; 1.0 µA ID ensures no impact on remote sensing accuracy. | Use Scenario: Securing MCU GPIOs and relay driver outputs in washing machines and HVAC controllers exposed to relay coil flyback. IC Role / Device Role / Timing Role: Localized protection at each high-side switch output, suppressing 600 V/30 A inductive spikes from solenoid valves. Use Value: DO-214AB footprint allows dense placement near connectors; AEC-Q101 qualification covers extended temperature cycling in appliance thermal chambers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A-E3/57T | Lower PPPM (400 W), smaller DO-214AC (SMA) package, same VWM/VBR range | Suitable for lower-energy transients (e.g., ESD-only) but insufficient for ISO 7637-2 Pulse 5a | Select only if board space is critical and surge energy is ≤400 W |
| SMCJ30AHE3/57T | Identical electrical specs, but AEC-Q101 qualified (HE3 suffix) vs. commercial-grade E3 | Required for automotive OEM designs requiring full qualification documentation and traceability | Choose SMCJ30AHE3/57T when automotive PPAP submission or zero-defect reliability is mandated |
Compared with SMAJ30A-E3/57T and SMCJ30AHE3/57T, the SMCJ30-E3/57T delivers optimal balance of 1500 W surge capacity, commercial-grade cost, and proven DO-214AB thermal performance - making it the preferred choice for industrial and Tier-2 automotive applications where AEC-Q101 is not contractually required.
Availability
SMCJ30-E3/57T is available at Aetrix Electronics and suitable for automotive ECU design, industrial motor drive development, and telecom power system prototyping requiring stable component supply across multi-year production cycles.
Supply support for SMCJ30-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, efficiency, and application-specific optimization.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without compromising signal integrity.
FAQ
What is the clamping voltage of the SMCJ30-E3/57T under maximum rated surge current?
The SMCJ30-E3/57T exhibits a maximum clamping voltage (VC) of 48.4 V when subjected to its rated 31.0 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and ensures downstream components see less than 49 V during worst-case transients - critical for protecting 3.3 V or 5 V logic rails fed from 30 V supplies.
Is the SMCJ30-E3/57T suitable for automotive applications?
Yes, the SMCJ30-E3/57T is RoHS-compliant and meets MSL Level 1 per J-STD-020, but it is not AEC-Q101 qualified. For non-safety-critical automotive subsystems (e.g., infotainment power rails or body control modules without OEM qualification mandates), the SMCJ30-E3/57T provides robust protection. However, for systems requiring formal AEC-Q101 certification, the SMCJ30AHE3/57T variant must be used instead.
How does the SMCJ30-E3/57T differ from bi-directional SMCJ30CA variants?
The SMCJ30-E3/57T is unidirectional, featuring a cathode band and conducting only during positive transients relative to ground. In contrast, SMCJ30CA devices are bi-directional with no polarity marking and clamp both positive and negative excursions - making them suitable for AC lines or differential data buses. The SMCJ30-E3/57T offers lower leakage and tighter VBR tolerance for DC rail protection.
What is the thermal resistance profile of the SMCJ30-E3/57T?
The SMCJ30-E3/57T has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads. This allows sustained 6.5 W power dissipation at TA = 50 °C and supports operation up to +150 °C junction temperature - essential for under-hood or enclosed industrial enclosures without active cooling.
Does the SMCJ30-E3/57T require derating at elevated ambient temperatures?
Yes, the SMCJ30-E3/57T must be derated above TA = 25 °C per Figure 2 in Vishay document 88394. At 85 °C ambient, its peak pulse power capability drops to approximately 75 % of 1500 W (i.e., ~1125 W), and at 125 °C, it falls to ~40 %. Designers must verify clamping performance under worst-case thermal conditions using the published derating curve to ensure margin remains sufficient for application-specific surge profiles.
SMCJ30-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 28A
- 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)
SMCJ30-E3/57T FAQ
1.How can I place an order for SMCJ30-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30-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 SMCJ30-E3/57T reliable?
The price and inventory of SMCJ30-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 SMCJ30-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ30-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30-E3/57T?
SMCJ30-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30-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 SMCJ30-E3/57T?
For technical support, including SMCJ30-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30-E3/57T requirements.
6.How does Aetrix verify that SMCJ30-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ30-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 SMCJ30-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ30-E3/57T?
All SMCJ30-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30-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 SMCJ30-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ30-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30-E3/57T Tags
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