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Vishay General Semiconductor - Diodes Division SMCJ30CA-E3/9AT
- Part No.:
- SMCJ30CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30CA-E3/9AT.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,210
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Product details
Overview
SMCJ30CA-E3/9AT from Vishay General Semiconductor is a bidirectional surface-mount 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 sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching transients and lightning-induced surges.
For engineers reviewing the SMCJ30CA-E3/9AT datasheet, SMCJ30CA-E3/9AT pinout, SMCJ30CA-E3/9AT application, or SMCJ30CA-E3/9AT equivalent, key selection criteria include bidirectional clamping capability, 1500 W surge rating, 30 V working voltage, RoHS-compliant matte tin plating, and AEC-Q101 qualification eligibility via HE3/HM3 variants - all critical for robust overvoltage protection in harsh environments.
Technical Context
The SMCJ30CA-E3/9AT operates as a bidirectional avalanche diode, exhibiting symmetrical breakdown behavior in both polarities with identical VBR min/max (33.3 V / 36.8 V) and clamping performance. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps), enabling effective suppression of sub-nanosecond transients.
Thermally, it features RθJA = 75 °C/W and RθJL = 15 °C/W, supporting reliable operation up to TJ = +150 °C. The device is rated for non-repetitive 10/1000 μs waveform surges and derates linearly above TA = 25 °C per Figure 2, with MSL Level 1 moisture sensitivity and LF peak reflow tolerance of 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines system-level DC bias compatibility. |
| VBR (min/max) | 33.3 V / 36.8 V - Breakdown occurs within this range at 1.0 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 48.4 V - Clamped voltage across device at 31.0 A peak pulse current; determines maximum stress on protected circuitry. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 μs waveform; quantifies single-event surge energy absorption capacity. |
| ID @ VWM | ≤1.0 μA - Reverse leakage current at 30 V; guarantees minimal standby power loss and signal integrity in high-impedance paths. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive and industrial ambient conditions. |
| Package | SMC (DO-214AB) - Surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal requirement; supports automated placement and high-power dissipation. |
Pinout & Package
SMCJ30CA-E3/9AT uses the SMC (DO-214AB) package: a 2-terminal, bidirectional surface-mount device with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | No functional distinction between terminals; either terminal serves as anode or cathode depending on instantaneous polarity of surge event. |
| Case (cathode band absent) | Non-polarized package body | Absence of band confirms bidirectional configuration; eliminates orientation errors during automated assembly. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions - simplifies PCB layout and eliminates polarity concerns in AC-coupled or floating signal lines. |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) without degradation - suitable for front-end protection in industrial interfaces. |
| Low incremental surge resistance | Enables tight VC-to-VWM ratio (48.4 V / 30 V = 1.61) - minimizes overvoltage overshoot during fast transients while maintaining margin to IC absolute maximum ratings. |
| AEC-Q101 qualification option | HE3/HM3 suffix variants available - meets automotive-grade reliability requirements including temperature cycling, HTRB, and ESD testing for engine control and ADAS modules. |
| MSL Level 1, 260 °C reflow | Compatible with standard lead-free SMT processes without pre-baking - reduces manufacturing complexity and cost in high-volume production. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and CAN node power rails from load dump and alternator ripple in 12 V vehicle electrical systems. IC Role / Device Role: Bidirectional shunt clamp absorbing >100 V transients while holding downstream voltage below 50 V. Use Value: Prevents latch-up or destruction of 3.3 V/5 V microcontrollers and transceivers during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) and digital I/O of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role: Low-leakage (≤1.0 μA) transient suppressor placed directly at connector entry point. Use Value: Maintains signal fidelity during EFT bursts (IEC 61000-4-4) and prevents false triggering due to sub-μA leakage drift. |
| Telecom DSL Line Interface | Consumer Appliance Motor Drive Control |
|
Use Scenario: Safeguarding ADSL/VDSL line drivers and receivers from lightning-induced surges on outdoor copper pairs. IC Role / Device Role: Primary-stage TVS in hybrid coupler circuits, coordinated with gas discharge tubes (GDTs) for staged protection. Use Value: 1500 W rating handles 10/700 μs telecom surges per ITU-T K.21; 48.4 V VC aligns with 50 V-rated interface ICs. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines, HVAC blowers, and power tools. IC Role / Device Role: Snubber-connected TVS across motor terminals or flyback diode replacement in low-side switch configurations. Use Value: Fast response (<1 ps) clamps 100+ V inductive kick before MOSFET drain-source breakdown; SMC package withstands repeated 31 A pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC30CA | Same VWM (30 V) and PPPM (1500 W), but smaller SMA package (DO-214AC); lower thermal mass and higher RθJA (100 °C/W). | Limited to lower-duty-cycle surges; unsuitable for sustained industrial environments above 85 °C ambient. | Select SAC30CA only when board space is constrained and thermal derating can be accommodated. |
| SMCJ33CA | Higher VWM (33 V), VBR (36.7–40.6 V), and VC (53.3 V); same SMC package and 1500 W rating. | Better suited for 3.3 V logic with tighter margin to 36 V rail; less effective for 30 V nominal systems requiring precise clamping. | Choose SMCJ33CA if system nominal voltage is ≥33 V or if higher VBR improves noise immunity without violating downstream IC limits. |
Compared with SAC30CA and SMCJ33CA, the SMCJ30CA-E3/9AT provides optimal balance of 30 V standoff precision, 48.4 V clamping headroom, and SMC thermal robustness - making it the preferred choice for 12–30 V systems where both accuracy and reliability are required.
Availability
SMCJ30CA-E3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom line protection, and consumer appliance motor drives requiring stable component supply and full traceability.
Supply support for SMCJ30CA-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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series targets high-energy transient suppression in demanding environments, engineered for automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 readiness are essential.
FAQ
What is the clamping voltage of the SMCJ30CA-E3/9AT at its rated peak pulse current?
The SMCJ30CA-E3/9AT has a maximum clamping voltage (VC) of 48.4 V at its rated peak pulse current (IPPM) of 31.0 A, measured under the standard 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during a surge event and is confirmed in the Vishay datasheet Document Number 88394, Table on page 2. The SMCJ30CA-E3/9AT maintains this clamping performance symmetrically in both directions due to its bidirectional construction.
Is the SMCJ30CA-E3/9AT RoHS-compliant and halogen-free?
Yes, the SMCJ30CA-E3/9AT carries the "E3" suffix, indicating it is RoHS-compliant and commercial grade per Vishay's ordering nomenclature. It is not halogen-free; that designation requires the "M3" suffix (e.g., SMCJ30CA-M3/9AT). The E3 variant uses matte tin-plated leads and meets JESD 201 Class 2 whisker resistance, making the SMCJ30CA-E3/9AT suitable for standard commercial and industrial applications where halogen-free compliance is not mandated.
Does the SMCJ30CA-E3/9AT have polarity markings on its package?
No, the SMCJ30CA-E3/9AT does not have polarity markings such as a cathode band because it is a bidirectional TVS diode. Unlike unidirectional variants (e.g., SMCJ30A), the CA suffix indicates symmetrical avalanche behavior in both directions, eliminating the need for orientation during placement. This feature simplifies PCB design and automated assembly for the SMCJ30CA-E3/9AT, especially in AC-coupled or floating signal paths.
What is the maximum operating junction temperature for the SMCJ30CA-E3/9AT?
The SMCJ30CA-E3/9AT has a maximum operating junction temperature (TJ max.) of +150 °C, as specified in the Vishay datasheet under "Maximum Ratings." This rating allows the device to function reliably in under-hood automotive environments, industrial enclosures, and other high-ambient-temperature applications. Derating of peak pulse power begins above TA = 25 °C per Figure 2 in the datasheet, ensuring safe operation of the SMCJ30CA-E3/9AT across its full thermal range.
Can the SMCJ30CA-E3/9AT be used as a direct replacement for SMCJ30A in existing designs?
No, the SMCJ30CA-E3/9AT is not a direct replacement for the unidirectional SMCJ30A. While both share identical VWM (30 V), VBR (33.3–36.8 V), and PPPM (1500 W), the SMCJ30CA-E3/9AT is bidirectional with no polarity marking, whereas SMCJ30A is unidirectional with a cathode band. Substituting the SMCJ30CA-E3/9AT into a unidirectional circuit may cause unintended conduction or failure to clamp correctly - always verify topology compatibility before using the SMCJ30CA-E3/9AT.
SMCJ30CA-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:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ30CA-E3/9AT FAQ
1.How can I place an order for SMCJ30CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30CA-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 SMCJ30CA-E3/9AT reliable?
The price and inventory of SMCJ30CA-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 SMCJ30CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ30CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30CA-E3/9AT?
SMCJ30CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30CA-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 SMCJ30CA-E3/9AT?
For technical support, including SMCJ30CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ30CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ30CA-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 SMCJ30CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ30CA-E3/9AT?
All SMCJ30CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30CA-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 SMCJ30CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ30CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30CA-E3/9AT Tags
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