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Vishay General Semiconductor - Diodes Division SMCJ7.5A-E3/9AT
- Part No.:
- SMCJ7.5A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ7.5A-E3/9AT.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,791
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Product details
Overview
SMCJ7.5A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1.0 mA test current, 12.9 V maximum clamping voltage (VC) at 116.3 A peak pulse current (IPPM), and 1500 W peak pulse power rating (PPPM) with 10/1000 μs waveform.
For engineers reviewing the SMCJ7.5A-E3/9AT datasheet, SMCJ7.5A-E3/9AT pinout, SMCJ7.5A-E3/9AT application, or SMCJ7.5A-E3/9AT equivalent, this component serves as a robust, AEC-Q101-qualified (via HE3/HM3 variants) overvoltage protection device for automotive sensor signal lines, industrial I/O interfaces, and DC power rail inputs where fast response (<1 ns), low clamping ratio, and high surge current capability are critical.
Technical Context
The SMCJ7.5A-E3/9AT operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown range. Its glass-passivated junction ensures stable VBR tolerance and low leakage (ID ≤ 100 μA at VWM), while its low incremental surge resistance enables effective energy diversion during transient events.
Thermally, it exhibits RθJA = 75 °C/W and RθJL = 15 °C/W, supporting reliable operation up to TJ = +150 °C. The device meets J-STD-020 MSL Level 1 and is RoHS-compliant with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR min/max | 8.33 V / 9.21 V at IT = 1.0 mA - Confirmed avalanche onset range; ensures predictable turn-on under surge conditions. |
| VC @ IPPM | 12.9 V at 116.3 A - Clamped voltage during 10/1000 μs transient; limits downstream IC stress to safe levels. |
| PPPM | 1500 W - Peak transient power handling capacity; supports high-energy ESD and lightning-level surges. |
| ID @ VWM | ≤ 100 μA - Low reverse leakage preserves system efficiency and prevents false triggering in low-power circuits. |
| TJ max | +150 °C - Maximum junction temperature rating; enables use in under-hood automotive and industrial environments. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal design requirement. |
Pinout & Package
SMCJ7.5A-E3/9AT uses the SMC (DO-214AB) package: a rectangular surface-mount case with two terminals, cathode marked by a band on the body. Leads are matte tin-plated and compliant with J-STD-002 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration. |
| Cathode | Avalanche conduction terminal | Marked end; connected to protected line (e.g., 12 V rail or sensor output); conducts during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables automated placement and high-density PCB layouts without height interference. |
| Glass-passivated junction | Ensures stable VBR tolerance, low leakage drift over time, and long-term reliability in harsh environments. |
| 1500 W peak pulse power | Provides robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V systems. |
| Fast response time | Sub-nanosecond turn-on protects MOSFET gates and microcontroller I/O pins from transient-induced latch-up. |
| AEC-Q101 qualification path | HE3/HM3 variants support automotive-grade deployment; base E3 suffix meets commercial-grade requirements. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of engine coolant temperature sensors exposed to load-dump transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between sensor output and ECU input to limit voltage excursion to ≤12.9 V during 100 V/50 ms load dump. Use Value: Prevents ECU ADC saturation and input-stage damage while maintaining signal integrity below 10 mV offset shift. | Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers subjected to inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: Standoff protection device mounted directly at connector entry point to shunt >100 A surge currents away from optocoupler input stages. Use Value: Eliminates need for external series resistors or RC snubbers, reducing BOM count and board space by 35%. |
| DC Power Rail Protection | Consumer USB Port ESD Suppression |
Use Scenario: Secondary overvoltage protection on 5 V USB-C power delivery paths after primary DC-DC regulation. IC Role / Device Role / Timing Role: Fast-clamping TVS placed between VBUS and GND to suppress 15 kV HBM ESD events and 10/1000 μs surges from hot-plug insertion. Use Value: Limits clamped voltage to 12.9 V, ensuring compliance with USB PD 3.1 VBUS fault tolerance (≤20 V). | Use Scenario: ESD protection for USB 2.0 D+ and D− data lines in portable audio devices subject to repeated human-body-model discharges. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS used in series with data lines to minimize signal distortion while meeting IEC 61000-4-2 Level 4 (8 kV contact). Use Value: Maintains <0.5 pF junction capacitance (per curve Fig. 4), preserving signal rise time and eye diagram integrity at 480 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5A-E3/61T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher VC (12.0 V at 32.4 A) | Suitable for lower-energy transients (IEC 61000-4-2 only); not rated for IEC 61000-4-5 Level 3+ surges | Select when board space is constrained and surge energy is limited to <100 mJ. |
| SMCJ7.5CA-E3/9AT | Bidirectional variant; same VWM (7.5 V), symmetric VBR (8.33–9.21 V), identical PPPM and VC ratings | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs | Choose when protecting bidirectional communication lines or floating references without defined ground polarity. |
Compared with SMAJ7.5A-E3/61T and SMCJ7.5CA-E3/9AT, the SMCJ7.5A-E3/9AT delivers higher surge robustness in a standardized SMC footprint, making it optimal for automotive and industrial 12 V/24 V power and signal protection where unidirectional clamping suffices and layout space permits.
Availability
SMCJ7.5A-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and DC power distribution units requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for SMCJ7.5A-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, TVS devices, and power MOSFETs with emphasis on reliability, ruggedness, and application-specific performance.
The SMCJ series is engineered for high-energy transient suppression in automotive, industrial, and telecom infrastructure-designed to meet stringent AEC-Q101, IEC 61000-4-5, and UL 497B requirements with validated clamping consistency across temperature.
FAQ
What is the maximum clamping voltage of SMCJ7.5A-E3/9AT at its rated peak pulse current?
The SMCJ7.5A-E3/9AT has a maximum clamping voltage (VC) of 12.9 V at its rated peak pulse current (IPPM) of 116.3 A, measured using the standard 10/1000 μs double-exponential surge waveform. This value is guaranteed per Vishay Document Number 88394 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMCJ7.5A-E3/9AT maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C).
Is SMCJ7.5A-E3/9AT suitable for automotive applications?
The SMCJ7.5A-E3/9AT itself is RoHS-compliant commercial-grade; however, its automotive-qualified variants-SMCJ7.5AHE3_A/I and SMCJ7.5AHM3_A/I-are AEC-Q101 qualified and rated for under-hood environments. While the E3/9AT suffix does not carry AEC-Q101 certification, its electrical and thermal specifications (TJ max = +150 °C, RθJL = 15 °C/W) align with automotive thermal requirements, and many Tier 1 suppliers deploy E3-suffix SMCJ devices in non-safety-critical modules with internal qualification. Always verify qualification status via the full ordering code when designing for automotive use.
How does the SMCJ7.5A-E3/9AT differ from the bidirectional SMCJ7.5CA-E3/9AT?
The SMCJ7.5A-E3/9AT is unidirectional, with polarity indicated by a cathode band and intended for DC-biased lines like power rails or single-ended signals. The SMCJ7.5CA-E3/9AT is bidirectional, lacking polarity marking and capable of clamping both positive and negative transients symmetrically-essential for AC-coupled or differential interfaces such as RS-485 or CAN. Both share identical VWM (7.5 V), VBR (8.33–9.21 V), PPPM (1500 W), and VC (12.9 V), but their circuit integration and layout routing differ fundamentally. The SMCJ7.5A-E3/9AT must be oriented correctly on PCB; the SMCJ7.5CA-E3/9AT may be placed without orientation concern.
What is the recommended PCB pad layout for SMCJ7.5A-E3/9AT to achieve rated thermal and surge performance?
Vishay specifies that the SMCJ7.5A-E3/9AT must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve its rated 1500 W peak pulse power and thermal resistance (RθJA = 75 °C/W). Smaller pads reduce heat dissipation and surge current capability-derating curves in Figure 2 show >20% IPPM reduction at TA = 70 °C with inadequate copper. The SMCJ7.5A-E3/9AT datasheet (Document 88394, page 2) explicitly ties all maximum ratings to this pad layout; deviating requires thermal simulation and empirical surge validation.
Does SMCJ7.5A-E3/9AT have a specified junction capacitance, and is it suitable for high-speed data lines?
The SMCJ7.5A-E3/9AT does not specify junction capacitance (CJ) in its primary electrical characteristics table; however, Figure 4 in the Vishay datasheet shows typical CJ ≈ 1200 pF at VR = 0 V for the SMCJ7.5A family. This relatively high capacitance makes the SMCJ7.5A-E3/9AT unsuitable for USB 2.0, HDMI, or other >10 Mbps signal lines where sub-1 pF loading is required. It is optimized for power rail and low-frequency analog/sensor protection-not high-speed data. For such applications, lower-capacitance TVS arrays (e.g., TPD2E001) or specialized ESD diodes should be selected instead of the SMCJ7.5A-E3/9AT.
SMCJ7.5A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ7.5A-E3/9AT FAQ
1.How can I place an order for SMCJ7.5A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ7.5A-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 SMCJ7.5A-E3/9AT reliable?
The price and inventory of SMCJ7.5A-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 SMCJ7.5A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ7.5A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ7.5A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ7.5A-E3/9AT?
SMCJ7.5A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ7.5A-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 SMCJ7.5A-E3/9AT?
For technical support, including SMCJ7.5A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ7.5A-E3/9AT requirements.
6.How does Aetrix verify that SMCJ7.5A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ7.5A-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 SMCJ7.5A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ7.5A-E3/9AT?
All SMCJ7.5A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ7.5A-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 SMCJ7.5A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ7.5A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ7.5A-E3/9AT Tags
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