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Vishay General Semiconductor - Diodes Division SMCJ7.5CA-E3/9AT
- Part No.:
- SMCJ7.5CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ7.5CA-E3/9AT.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ7.5CA-E3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1 mA test current, 12.9 V maximum clamping voltage (VC) at 116.3 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed on power rails and signal lines in automotive sensor interfaces and industrial I/O modules.
For engineers reviewing the SMCJ7.5CA-E3/9AT datasheet, SMCJ7.5CA-E3/9AT pinout, SMCJ7.5CA-E3/9AT application, or SMCJ7.5CA-E3/9AT equivalent, key selection criteria include bidirectional clamping symmetry, low clamping ratio (VC/VWM ≈ 1.72), AEC-Q101 qualification eligibility (via HE3 suffix variants), and compatibility with automated SMT placement on 8 mm × 8 mm copper pads per JEDEC standard.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, delivering identical electrical characteristics forward and reverse - critical for AC-coupled or floating signal paths where polarity reversal is possible. Its glass-passivated junction ensures stable VBR tolerance (±5% typical), low incremental surge resistance, and fast response time (<1 ns) to ESD and lightning-induced transients.
The device uses a planar silicon avalanche structure optimized for low clamping voltage and high surge current handling. Thermal performance is defined by RθJA = 75 °C/W (on recommended pad layout) and RθJL = 15 °C/W, enabling reliable operation up to TJ = +150 °C with derating above TA = 25 °C per Figure 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR min/max | 8.33 V / 9.21 V at IT = 1 mA - Tight breakdown window ensures predictable turn-on and minimal variation across production lots |
| VC @ IPPM | 12.9 V at 116.3 A - Clamping voltage during 10/1000 μs surge; limits downstream voltage stress to <1.72× VWM |
| PPPM | 1500 W - Peak pulse power handling capability under standardized surge waveform; supports IEC 61000-4-5 Level 4 compliance |
| ID @ VWM | 100 μA - Reverse leakage at rated stand-off voltage; low enough to avoid loading low-power sensor bias networks |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 8.13 mm footprint and 3.20 mm height; compatible with IPC-7351B standard land patterns |
Pinout & Package
SMCJ7.5CA-E3/9AT is a two-terminal bidirectional TVS diode housed in the SMC (DO-214AB) package. No polarity marking is applied, as both terminals are functionally identical. The device mounts with cathode/anode indistinguishable - symmetrical conduction eliminates orientation concerns during automated placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as input/output path for transient energy; no DC polarity dependency - ideal for AC lines, differential pairs, or floating buses |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically identical to Terminal 1; forms symmetrical clamping path across protected node and reference (e.g., ground or rail) |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout or external bridge configuration |
| Low clamping ratio | VC/VWM = 1.72 - minimizes voltage overshoot during surge, protecting 3.3 V and 5 V logic interfaces without additional series impedance |
| MSL Level 1 rating | Rated for reflow up to 260 °C peak - supports lead-free assembly without moisture sensitivity concerns or baking requirements |
| AEC-Q101 readiness | HE3/HM3 variants qualified - enables drop-in use in automotive ECUs, ADAS sensors, and body control modules requiring automotive-grade reliability |
| Glass passivated junction | Stable parametric drift over temperature and lifetime - maintains VBR tolerance and leakage stability in harsh thermal cycling environments |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN FD and LIN bus transceivers in engine control units against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between transceiver pins and chassis ground to shunt surge energy before IC input stages. Use Value: Maintains signal integrity during 10/1000 μs surges up to 1500 W while holding clamped voltage below 13 V - within absolute maximum ratings of 5 V tolerant transceivers. | Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to relay coil flyback and field wiring transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on channel input, mounted directly at connector entry point before optocoupler or Schmitt trigger interface. Use Value: Limits transient voltage to ≤12.9 V during 116 A surges, preventing latch-up or gate oxide damage in upstream protection FETs and level translators. |
| Consumer Power Adapter Output | Telecom Ethernet Port Protection |
Use Scenario: Secondary-side surge suppression on 12 V DC output rails of wall-mounted AC/DC adapters used in smart home hubs. IC Role / Device Role / Timing Role: Final-stage TVS placed after DC-DC converter and before USB-PD controller to absorb residual switching spikes and ESD events. Use Value: Withstands repetitive 1500 W surges without degradation, ensuring long-term reliability in unattended consumer deployments with no maintenance access. | Use Scenario: Common-mode transient suppression on RJ45 Ethernet ports in VoIP phones and small-cell base stations. IC Role / Device Role / Timing Role: Bidirectional clamp across differential pair (e.g., TX+/TX−) referenced to chassis ground to suppress EFT and lightning-induced common-mode noise. Use Value: Symmetrical clamping prevents signal skew and preserves Ethernet signal integrity up to 100 Mbps, verified per IEC 61000-4-4/5 test profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC7.5CA | Same VWM (7.5 V), lower PPPM (600 W), smaller SMA package (DO-214AC) | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 or automotive load dump | Select when board space is constrained and surge threat level is limited to ESD or low-energy switching noise |
| SMCJ7.0CA | Lower VWM (7.0 V), tighter VBR range (7.78–8.60 V), same PPPM (1500 W) and package | Higher risk of false triggering on nominal 7.5 V rails with ripple; requires margin verification in 7 V systems | Choose only if system nominal voltage is ≤7.0 V and clamping headroom must be maximized at cost of increased leakage |
Compared with SAC7.5CA and SMCJ7.0CA, the SMCJ7.5CA-E3/9AT provides optimal balance of 7.5 V system compatibility, 1500 W surge capacity, and SMC package thermal robustness - making it preferred for industrial and automotive applications demanding full IEC/ISO compliance without layout compromise.
Availability
SMCJ7.5CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer power adapter outputs, and telecom Ethernet port protection requiring stable component supply across multi-year production cycles.
Supply support for SMCJ7.5CA-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 is engineered for high-energy transient suppression in demanding environments - targeting automotive, industrial automation, and infrastructure equipment where failure modes must be mitigated without compromising signal fidelity or thermal margin.
FAQ
What is the clamping voltage of SMCJ7.5CA-E3/9AT at its rated peak pulse current?
The SMCJ7.5CA-E3/9AT has a maximum clamping voltage (VC) of 12.9 V when subjected to its rated peak pulse current (IPPM) of 116.3 A using the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and reflects worst-case voltage seen by downstream circuitry during surge events - a critical parameter for ensuring protected ICs remain within their absolute maximum voltage ratings. The SMCJ7.5CA-E3/9AT achieves this with a clamping ratio of approximately 1.72 relative to its 7.5 V stand-off voltage.
Is SMCJ7.5CA-E3/9AT suitable for automotive applications?
Yes, the SMCJ7.5CA-E3/9AT is suitable for automotive applications when used in conjunction with AEC-Q101-qualified variants (e.g., SMCJ7.5CAHE3). While the -E3/9AT suffix denotes RoHS-compliant commercial grade, the underlying SMCJ7.5CA die is AEC-Q101 qualified in HE3/HM3 configurations. Engineers deploying the SMCJ7.5CA-E3/9AT in automotive contexts should verify qualification status via Vishay's ordering code matrix and ensure thermal design meets under-hood ambient requirements up to +125 °C ambient with appropriate derating. The SMCJ7.5CA-E3/9AT itself supports TJ up to +150 °C.
How does the bidirectional nature of SMCJ7.5CA-E3/9AT affect PCB layout?
The bidirectional nature of SMCJ7.5CA-E3/9AT eliminates polarity constraints in PCB layout - no cathode band or orientation marking is present, and either terminal functions identically. This allows placement across differential signal pairs (e.g., RS-485, CAN), AC lines, or floating grounds without concern for directionality. Layout best practice remains mounting the device as close as possible to the protected node with short, low-inductance traces to ground or reference plane. The SMCJ7.5CA-E3/9AT's SMC package supports this with symmetric 2-pin geometry and low parasitic inductance.
What is the maximum reverse leakage current for SMCJ7.5CA-E3/9AT at its stand-off voltage?
The maximum reverse leakage current (ID) for SMCJ7.5CA-E3/9AT is 100 μA when biased at its rated stand-off voltage (VWM) of 7.5 V and tested at TA = 25 °C. This low leakage ensures minimal impact on high-impedance sensor bias networks, battery-powered circuits, or precision analog front-ends. Leakage increases with temperature and voltage stress but remains within specification limits up to TJ = +150 °C. The SMCJ7.5CA-E3/9AT's glass-passivated junction contributes to stable, repeatable leakage behavior across environmental stress testing.
Can SMCJ7.5CA-E3/9AT be used in place of a unidirectional TVS like SMCJ7.5A?
No - the SMCJ7.5CA-E3/9AT is strictly bidirectional and cannot replace a unidirectional TVS such as SMCJ7.5A in DC-biased applications requiring forward conduction or polarity-specific clamping. Unidirectional types have a defined cathode band and conduct in forward bias (e.g., for DC power rail protection), whereas the SMCJ7.5CA-E3/9AT clamps symmetrically in both directions and exhibits no forward voltage drop specification. Substituting the SMCJ7.5CA-E3/9AT for SMCJ7.5A would result in unintended conduction during normal DC operation. Always match device polarity type to circuit topology - the SMCJ7.5CA-E3/9AT is intended for AC, differential, or floating node protection only.
SMCJ7.5CA-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):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 116.3A
- 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)
SMCJ7.5CA-E3/9AT FAQ
1.How can I place an order for SMCJ7.5CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ7.5CA-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 SMCJ7.5CA-E3/9AT reliable?
The price and inventory of SMCJ7.5CA-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 SMCJ7.5CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ7.5CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ7.5CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ7.5CA-E3/9AT?
SMCJ7.5CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ7.5CA-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 SMCJ7.5CA-E3/9AT?
For technical support, including SMCJ7.5CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ7.5CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ7.5CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ7.5CA-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 SMCJ7.5CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ7.5CA-E3/9AT?
All SMCJ7.5CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ7.5CA-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 SMCJ7.5CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ7.5CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ7.5CA-E3/9AT Tags
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