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Vishay General Semiconductor - Diodes Division SMCJ30CAHE3/9AT
- Part No.:
- SMCJ30CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30CAHE3/9AT.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,963
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Product details
Overview
SMCJ30CAHE3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with a 10/1000 µs waveform. It features a 30 V standoff voltage (VWM), 48.4 V maximum clamping voltage at 31.0 A peak pulse current, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMCJ30CAHE3/9AT datasheet, SMCJ30CAHE3/9AT pinout, SMCJ30CAHE3/9AT application, or SMCJ30CAHE3/9AT equivalent, this device is selected for robust overvoltage protection on DC power rails, sensor signal lines, and automotive ECUs where fast response (<1 ns), low clamping ratio (1.61), and MSL Level 1 reflow compatibility are critical.
Technical Context
The SMCJ30CAHE3/9AT operates as a bidirectional avalanche diode, symmetrically clamping transient voltages above ±48.4 V while maintaining <1.0 µA leakage at 30 V reverse standoff. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance under repetitive surge stress.
Designed for PCB-level ESD and lightning-induced surge suppression, it delivers 1500 W peak pulse power handling per IEC 61000-4-5 (10/1000 µs) and meets UL 497B recognition (QVGQ2). Thermal resistance is 75 °C/W junction-to-ambient on standard 8 mm × 8 mm copper pads.
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 - Verified breakdown range at 1.0 mA test current; ensures consistent turn-on threshold |
| VC @ IPPM | 48.4 V - Clamped voltage at 31.0 A peak pulse current; defines worst-case voltage seen by protected circuit |
| PPPM | 1500 W - Peak pulse power rating per 10/1000 µs waveform; determines surge energy absorption capacity |
| ID @ VWM | 1.0 µA - Reverse leakage at rated standoff voltage; negligible loading on 30 V supply rails |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments |
| MSL Level | Level 1 - Compatible with standard 260 °C lead-free reflow without baking |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (bidirectional) | Conducts surge current during positive or negative overvoltage events; symmetrical to cathode |
| Cathode | Transient current sink (bidirectional) | Conducts surge current during positive or negative overvoltage events; symmetrical to anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, and ESD; enables use in engine control and ADAS modules |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) on 12 V/24 V systems without degradation |
| Clamping ratio of 1.61 | VC/VWM = 48.4/30; lower ratio than many competing TVS devices, reducing stress on downstream ICs |
| Low thermal resistance (RθJA = 75 °C/W) | Enables reliable operation at full power on standard PCB copper without heatsinking |
| UL 497B recognized (QVGQ2) | Approved for telecom and industrial signal line protection per safety standard for protectors |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontrollers and CAN transceivers against load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional clamping device placed between power rail and ground, responding within <1 ns to suppress spikes up to ±100 V. Use Value: Prevents latch-up or permanent damage to automotive-grade MCUs by limiting rail voltage to ≤48.4 V during 1500 W surges. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input modules. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing induced surges on 4–20 mA loop wiring exposed to motor drive noise. Use Value: Maintains signal integrity by holding sensor output node below 48.4 V during 10/1000 µs transients, avoiding ADC saturation or op-amp rail-to-rail clipping. |
| Telecom Line Interface Protection | Consumer USB Power Port Protection |
Use Scenario: Shielding Ethernet PHY power pins and data lines from EFT and surge coupling in PoE-powered switches. IC Role / Device Role / Timing Role: Standoff-rated TVS across VDD/GND and differential pairs, activated only during overvoltage events. Use Value: Enables compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) without adding series impedance or signal distortion. | Use Scenario: Adding secondary overvoltage protection on USB-C VBUS lines after primary buck converter stage. IC Role / Device Role / Timing Role: Fast-clamping element shunting fault currents from accidental 20 V adapter misconnection or hot-swap inrush. Use Value: Limits VBUS to 48.4 V during 31 A transient, preventing damage to USB PD controllers and port protection ICs rated for 24 V max. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CAHE3/A | Lower PPPM (400 W), smaller SMA package, same VWM/VC specs | Not suitable for IEC 61000-4-5 Level 4; limited to board-level ESD and low-energy transients | Select when space-constrained layouts require smaller footprint and surge energy is ≤400 W |
| SMCJ33CAHE3/9AT | Higher VWM (33 V), higher VBR (36.7–40.6 V), same package and PPPM | Better margin for 33 V nominal systems; clamps at 53.3 V, increasing protected IC voltage stress | Select for 33 V rail protection where tighter tolerance on clamping voltage is acceptable |
Compared with SMAJ30CAHE3/A and SMCJ33CAHE3/9AT, the SMCJ30CAHE3/9AT uniquely balances 30 V system compatibility, 1500 W surge capability, and AEC-Q101 qualification-making it optimal for automotive 12 V power domains requiring certified reliability and high-energy immunity.
Availability
SMCJ30CAHE3/9AT is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom infrastructure projects requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ30CAHE3/9AT 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 application-specific validation.
The SMCJ series targets high-energy transient suppression in harsh environments; engineered for automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated.
FAQ
What is the clamping voltage of SMCJ30CAHE3/9AT at its rated peak pulse current?
The SMCJ30CAHE3/9AT has a maximum clamping voltage (VC) of 48.4 V at its rated peak pulse current (IPPM) of 31.0 A, measured using a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuits during surge events and is confirmed in Vishay's datasheet Document Number 88394, page 2. The SMCJ30CAHE3/9AT maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMCJ30CAHE3/9AT suitable for automotive applications?
Yes, the SMCJ30CAHE3/9AT is AEC-Q101 qualified (as indicated by the "HE3" suffix), making it suitable for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. It meets stringent stress testing requirements for temperature cycling, high-temperature operating life, and ESD. The SMCJ30CAHE3/9AT is explicitly listed in Vishay's ordering table with automotive-grade qualification notes, confirming its readiness for under-hood and chassis-mounted deployments.
What does the "CA" suffix mean in SMCJ30CAHE3/9AT?
The "CA" suffix in SMCJ30CAHE3/9AT denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMCJ30A), the SMCJ30CAHE3/9AT has no polarity marking and functions identically in either orientation. This is essential for protecting AC-coupled lines, differential buses, or floating power domains where polarity reversal may occur.
What is the thermal resistance of SMCJ30CAHE3/9AT, and how does it affect PCB layout?
The SMCJ30CAHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's package drawing. To maintain safe junction temperatures during repeated 1500 W surges, designers must provide adequate copper area and avoid excessive trace length or isolation. The SMCJ30CAHE3/9AT does not require external heatsinking under standard conditions but benefits from thermal vias under pads for high-duty-cycle applications.
How does SMCJ30CAHE3/9AT compare to SMCJ30AHE3/9AT in circuit implementation?
The SMCJ30CAHE3/9AT is bidirectional with no polarity marking, while SMCJ30AHE3/9AT is unidirectional and requires correct cathode orientation relative to the protected rail. The SMCJ30CAHE3/9AT clamps both polarities at 48.4 V, whereas SMCJ30AHE3/9AT only clamps positive transients on the cathode side and conducts forward current if reverse-biased beyond VF (~3.5 V at 100 A). For DC power rails referenced to ground, SMCJ30AHE3/9AT offers slightly lower leakage but mandates strict layout polarity; SMCJ30CAHE3/9AT simplifies placement at the cost of marginally higher standby leakage (1.0 µA vs. 1.0 µA for unidirectional at same VWM).
SMCJ30CAHE3/9AT 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:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ30CAHE3/9AT FAQ
1.How can I place an order for SMCJ30CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30CAHE3/9AT 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 SMCJ30CAHE3/9AT reliable?
The price and inventory of SMCJ30CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ30CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30CAHE3/9AT?
SMCJ30CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30CAHE3/9AT 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 SMCJ30CAHE3/9AT?
For technical support, including SMCJ30CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30CAHE3/9AT requirements.
6.How does Aetrix verify that SMCJ30CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ30CAHE3/9AT 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 SMCJ30CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ30CAHE3/9AT?
All SMCJ30CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30CAHE3/9AT, 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 SMCJ30CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ30CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30CAHE3/9AT Tags
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