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Vishay General Semiconductor - Diodes Division SMCJ30AHE3/9AT
- Part No.:
- SMCJ30AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30AHE3/9AT.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,433
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Product details
Overview
SMCJ30AHE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 30 V standoff voltage (VWM), 48.4 V clamping voltage (VC) at 31.0 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics against inductive switching transients.
For engineers reviewing the SMCJ30AHE3/9AT datasheet, SMCJ30AHE3/9AT pinout, SMCJ30AHE3/9AT application, or SMCJ30AHE3/9AT equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 1500 W surge rating, 30 V working voltage, and SMC surface-mount compatibility with automated placement.
Technical Context
This TVS diode operates as a clamping device that transitions from high-impedance to low-impedance state within picoseconds upon detecting a transient exceeding its breakdown voltage (VBR = 33.3–36.8 V). Its glass-passivated junction ensures stable leakage performance and robust surge handling under repetitive stress.
Designed for unidirectional DC line protection, it features a cathode band marking, meets MSL Level 1 per J-STD-020, and supports peak forward surge current (IFSM) up to 200 A (8.3 ms half-sine), enabling use in 12 V/24 V automotive power rails and industrial I/O interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 33.3 V / 36.8 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 48.4 V - Clamped voltage during 10/1000 µs surge at 31.0 A, limiting downstream voltage stress |
| PPPM | 1500 W - Peak pulse power handling capability under standardized 10/1000 µs waveform |
| IPPM | 31.0 A - Maximum non-repetitive surge current supported at rated clamping voltage |
| TJ max. | +150 °C - Maximum junction temperature, enabling operation in under-hood automotive environments |
| Leakage @ VWM | 1.0 µA - Low reverse leakage ensures minimal standby power loss in always-on circuits |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H), with cathode band marking on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or return path; defines current flow direction during clamping |
| Cathode | High-side surge input terminal | Marked with band; connects to protected line (e.g., 12 V rail); conducts surge current to ground when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage across temperature and lifetime |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a) |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| 1500 W 10/1000 µs rating | Provides robust protection against load dump and inductive kick events in 24 V systems |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground, clamping surges before they reach PMICs or microcontrollers. Use Value: Limits rail voltage to ≤48.4 V during 31 A transients, preventing latch-up or gate oxide damage in downstream silicon. | Use Scenario: Shielding analog outputs of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) unidirectional clamp on sensor output line referenced to system ground. Use Value: Maintains signal integrity with sub-µA leakage at 30 V, while suppressing ±8 kV contact ESD per IEC 61000-4-2. |
| MOSFET Gate Driver Protection | Telecom DC Power Interface |
Use Scenario: Safeguarding high-side N-channel MOSFET drivers in motor control inverters from shoot-through-induced voltage spikes. IC Role / Device Role / Timing Role: Fast-response (sub-ns) TVS placed between gate and source, absorbing Miller-induced transients. Use Value: Clamps gate-source voltage to safe levels (<48.4 V) without adding parasitic capacitance that degrades switching speed. | Use Scenario: Front-end surge suppression on -48 V telecom power feeds exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary unidirectional clamp on negative supply rail, referenced to chassis ground. Use Value: Handles 1500 W pulses while maintaining 30 V nominal operation-critical for legacy -48 V infrastructure compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30AHE3/A | Lower PPPM (400 W), smaller SMA package, same VWM/VC specs | Suitable for space-constrained, lower-energy circuits (e.g., USB port protection) | Select SMCJ30AHE3/9AT when 1500 W surge immunity is required; SMAJ30AHE3/A fits tighter layouts but sacrifices energy handling. |
| SMCJ30CAHE3/9AT | Bidirectional variant; symmetric VBR and clamping in both polarities; same package and PPPM | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal may occur | Choose SMCJ30CAHE3/9AT only if bidirectional clamping is needed; SMCJ30AHE3/9AT is optimal for fixed-polarity DC rails. |
Compared with SMAJ30AHE3/A and SMCJ30CAHE3/9AT, the SMCJ30AHE3/9AT uniquely delivers 1500 W unidirectional surge protection in an AEC-Q101-qualified SMC package-making it the preferred choice for automotive power distribution and industrial 24 V control modules where high-energy, polarity-specific clamping is mandatory.
Availability
SMCJ30AHE3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, MOSFET gate driver safeguarding, and telecom DC feed protection requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ30AHE3/9AT 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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and automotive qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments-including under-hood automotive, industrial automation, and telecom infrastructure.
FAQ
What is the clamping voltage of the SMCJ30AHE3/9AT under maximum rated surge current?
The SMCJ30AHE3/9AT clamps to 48.4 V when subjected to its maximum rated peak pulse current of 31.0 A under the standard 10/1000 µs waveform. This value is measured at TA = 25 °C with specified mounting conditions (0.31" × 0.31" copper pads), and represents the upper voltage limit imposed on protected circuitry during surge events. The SMCJ30AHE3/9AT maintains this clamping performance across its full operating temperature range.
Is the SMCJ30AHE3/9AT suitable for automotive applications?
Yes, the SMCJ30AHE3/9AT is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It meets requirements for temperature cycling, mechanical shock, and humidity testing per AEC-Q101 Rev D. Its 1500 W surge rating, +150 °C max junction temperature, and MSL Level 1 reflow compatibility make the SMCJ30AHE3/9AT appropriate for engine control units, body electronics, and ADAS power domains.
How does the SMCJ30AHE3/9AT differ from the bidirectional SMCJ30CAHE3/9AT?
The SMCJ30AHE3/9AT is unidirectional and clamps only when voltage exceeds 30 V in the forward direction (anode-to-cathode), whereas the SMCJ30CAHE3/9AT provides symmetrical clamping for both polarities. Both share identical package, PPPM, and thermal ratings, but the SMCJ30AHE3/9AT offers lower leakage and is optimized for DC power rails. The SMCJ30AHE3/9AT must not be substituted for SMCJ30CAHE3/9AT in AC or floating applications without circuit review.
What is the reverse leakage current of the SMCJ30AHE3/9AT at its standoff voltage?
The SMCJ30AHE3/9AT exhibits a maximum reverse leakage current (ID) of 1.0 µA at its rated standoff voltage (VWM) of 30 V and TA = 25 °C. This low leakage ensures minimal power loss in always-on automotive modules and preserves accuracy in high-impedance sensor interfaces. Leakage remains below 5 µA up to +125 °C per Vishay's characterization data.
Does the SMCJ30AHE3/9AT require a heatsink for normal operation?
No, the SMCJ30AHE3/9AT is designed for surface-mount operation without external heatsinking under typical surge duty cycles. Its thermal resistance (RθJA) is 75 °C/W on standard PCB pads (0.31" × 0.31"), and continuous power dissipation is limited to 6.5 W. For repeated surge events or elevated ambient temperatures, thermal relief via increased copper area is recommended-but no dedicated heatsink is required for compliance with its 1500 W single-pulse rating. The SMCJ30AHE3/9AT relies on PCB copper as its primary heat path.
SMCJ30AHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ30AHE3/9AT FAQ
1.How can I place an order for SMCJ30AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30AHE3/9AT 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 SMCJ30AHE3/9AT reliable?
The price and inventory of SMCJ30AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ30AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30AHE3/9AT?
SMCJ30AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30AHE3/9AT 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 SMCJ30AHE3/9AT?
For technical support, including SMCJ30AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30AHE3/9AT requirements.
6.How does Aetrix verify that SMCJ30AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ30AHE3/9AT 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 SMCJ30AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ30AHE3/9AT?
All SMCJ30AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30AHE3/9AT, 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 SMCJ30AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ30AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30AHE3/9AT Tags
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