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Vishay General Semiconductor - Diodes Division SMCJ30-E3/9AT
- Part No.:
- SMCJ30-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30-E3/9AT.pdf
- Description:
- TVS DIODE 30VWM 53.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,571
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Product details
Overview
SMCJ30-E3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 30 V stand-off voltage (VWM), 48.4 V clamping voltage at 31.0 A peak pulse current (IPPM), 1500 W peak pulse power (PPPM), and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMCJ30-E3/9AT datasheet, SMCJ30-E3/9AT pinout, SMCJ30-E3/9AT application, or SMCJ30-E3/9AT equivalent, this device is selected for high-energy surge suppression in automotive ECUs, industrial motor drives, and telecom power interfaces where fast response (<1 ns), low clamping ratio, and MSL Level 1 solderability are critical.
Technical Context
The SMCJ30-E3/9AT operates as a silicon avalanche diode with glass-passivated junction, delivering bi-directional surge immunity only when used in paired configuration - its unidirectional variant requires correct polarity placement with cathode band aligned to protected line ground. It complies with ANSI/IEEE C62.35 for transient suppression and meets UL 497B recognition (QVGQ2).
Thermal performance is defined by RθJA = 75 °C/W (typ.) and RθJL = 15 °C/W (typ.), enabling reliable operation up to TJ = 150 °C. Its 10/1000 µs waveform rating and derating curve (Fig. 2) support design validation across ambient temperatures from –55 °C to +125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min/max | 33.3 V / 36.8 V at 1 mA - Breakdown voltage tolerance ensures consistent turn-on across production lots. |
| VC @ IPPM | 48.4 V at 31.0 A - Clamping voltage under full 1500 W surge; determines maximum stress on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 µs waveform; supports ISO 7637-2 Pulse 1/2/5a compliance. |
| ID @ VWM | 1.0 µA - Reverse leakage at rated stand-off; negligible power loss in always-on protection circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments. |
| MSL Level | Level 1 (J-STD-020) - Supports lead-free reflow up to 260 °C peak without preconditioning. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102. Cathode identified by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Connected to protected line (e.g., +12 V rail) | Forward-biased during positive transients; must be placed upstream of load. |
| Cathode (banded end) | Connected to reference/ground plane | Defines unidirectional conduction path; incorrect orientation disables protection. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, and HAST. |
| Glass passivated junction | Ensures stable breakdown characteristics and long-term reliability under thermal cycling. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 16750-2 load dump spikes). |
| UL 497B recognized (QVGQ2) | Meets safety standard for telecom and industrial signal-line protectors; simplifies system certification. |
| RoHS-compliant, JESD201 Class 1A whisker tested | Enables use in high-reliability consumer and medical-adjacent applications with no tin whisker risk. |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive I/O Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power inputs in engine control units (ECUs) against ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a (load dump). IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and LDO input, clamping within <1 ns to limit voltage to ≤48.4 V. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers during vehicle cranking or alternator regulation faults. |
Use Scenario: Shielding analog sensor inputs (e.g., current shunt amplifiers) and digital I/O lines in variable-frequency drives exposed to EFT/burst noise and motor commutation spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS on 3.3 V/5 V signal paths, absorbing repetitive 500 W surges without degradation. Use Value: Maintains signal integrity and avoids false triggering in feedback loops during high-dV/dt switching events. |
| Telecom DC Power Interface | Consumer Appliance Main Board Protection |
Use Scenario: Safeguarding PoE-powered Ethernet switches and base station DC inputs against lightning-induced surges per IEC 61000-4-5 (1.2/50 µs + 8/20 µs combo wave). IC Role / Device Role / Timing Role: Primary-level TVS on 48 V input rail, coordinated with secondary MOV/GDT stages for staged energy diversion. Use Value: Enables single-stage clamping to sub-60 V levels, reducing need for oversized downstream capacitors and improving surge withstand beyond 10 kV. |
Use Scenario: Securing AC-DC converter outputs and microcontroller supply rails in smart home hubs and white goods against mains-borne transients (IEC 61000-4-4 EFT). IC Role / Device Role / Timing Role: Low-leakage (1 µA) TVS on 5 V/12 V rails, operating continuously without thermal drift or standby current penalty. Use Value: Eliminates field failures due to repeated sub-100 V surges that degrade unprotected LDOs and USB PHYs over time. |
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-E3/61T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Suitable for space-constrained consumer PCBs but insufficient for automotive load dump (ISO 7637-2 Pulse 5a) | Select when board area is critical and surge energy is limited to ≤400 W. |
| SMCJ30CA-E3/9AT | Bi-directional version; same VWM (30 V), VC (48.4 V), and PPPM (1500 W); no polarity marking | Used in AC-coupled or floating signal lines (e.g., RS-485, CAN FD) requiring symmetrical clamping | Choose for differential bus protection where bidirectional transients dominate. |
Compared with SMCJ30-E3/9AT, SMAJ30A-E3/61T offers footprint savings at the cost of 73 % lower surge capacity, while SMCJ30CA-E3/9AT provides identical surge robustness with polarity-agnostic installation - making it preferable for differential signaling but unsuitable for DC rail polarity enforcement.
Availability
SMCJ30-E3/9AT is available at Aetrix Electronics and suitable for automotive ECU designs, industrial motor drive interfaces, and telecom DC power systems requiring stable component supply with AEC-Q101 assurance and RoHS compliance.
Supply support for SMCJ30-E3/9AT 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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The SMCJ series targets high-energy transient suppression in harsh environments, with design focus on AEC-Q101 qualification, UL recognition, and compatibility with automated SMT assembly for Tier 1 automotive suppliers.
FAQ
What is the clamping voltage of the SMCJ30-E3/9AT under maximum surge conditions?
The SMCJ30-E3/9AT clamps to 48.4 V at its rated peak pulse current of 31.0 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The SMCJ30-E3/9AT maintains this clamping performance across its full operating temperature range when mounted per recommended pad layout.
Is the SMCJ30-E3/9AT suitable for automotive applications?
Yes, the SMCJ30-E3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its 150 °C maximum junction temperature, MSL Level 1 reflow capability, and compliance with ISO 7637-2 Pulse 1/2/5a make it appropriate for protecting ECUs, body control modules, and ADAS power supplies. The SMCJ30-E3/9AT also carries UL 497B recognition for system-level safety certification.
How does the SMCJ30-E3/9AT differ from the bi-directional SMCJ30CA-E3/9AT?
The SMCJ30-E3/9AT is unidirectional with a cathode band marking, intended for DC rail protection where polarity is fixed. The SMCJ30CA-E3/9AT is bi-directional, lacks polarity marking, and clamps symmetrically in both directions - ideal for AC-coupled or differential buses like CAN or RS-485. Both share identical VWM (30 V), VC (48.4 V), and PPPM (1500 W), but the SMCJ30-E3/9AT cannot replace the CA variant in floating applications.
What is the maximum reverse leakage current of the SMCJ30-E3/9AT at its rated stand-off voltage?
The SMCJ30-E3/9AT exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 30 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage ensures minimal standby power loss in always-connected protection circuits and prevents unintended biasing of sensitive analog front-ends. Leakage remains below 5 µA up to 125 °C per characterization data.
Does the SMCJ30-E3/9AT require heatsinking for standard operation?
No external heatsink is required for the SMCJ30-E3/9AT under typical surge duty cycles, as its RθJA of 75 °C/W and RθJL of 15 °C/W allow adequate thermal dissipation via standard PCB copper pads (0.31" × 0.31"). However, for repetitive surge events (>1 Hz) or elevated ambient temperatures (>85 °C), increasing copper area or adding thermal vias is recommended to maintain TJ ≤ 150 °C. The SMCJ30-E3/9AT's thermal performance is validated per Fig. 2 derating curves.
SMCJ30-E3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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-E3/9AT FAQ
1.How can I place an order for SMCJ30-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30-E3/9AT 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 SMCJ30-E3/9AT reliable?
The price and inventory of SMCJ30-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ30-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30-E3/9AT?
SMCJ30-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30-E3/9AT 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 SMCJ30-E3/9AT?
For technical support, including SMCJ30-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30-E3/9AT requirements.
6.How does Aetrix verify that SMCJ30-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ30-E3/9AT 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 SMCJ30-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ30-E3/9AT?
All SMCJ30-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30-E3/9AT, 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 SMCJ30-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ30-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30-E3/9AT Tags
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