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Vishay General Semiconductor - Diodes Division SMCJ7.5A-M3/9AT
- Part No.:
- SMCJ7.5A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ7.5A-M3/9AT.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,426
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Product details
Overview
SMCJ7.5A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. 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 (PPPM) with 10/1000 µs waveform.
For engineers reviewing the SMCJ7.5A-M3/9AT datasheet, SMCJ7.5A-M3/9AT pinout, SMCJ7.5A-M3/9AT application, or SMCJ7.5A-M3/9AT equivalent, key selection criteria include clamping performance under 100–200 A surge conditions, thermal resistance (RθJA = 75 °C/W), halogen-free RoHS compliance (M3 suffix), and suitability for automotive-grade designs when paired with AEC-Q101 qualified variants.
Technical Context
The SMCJ7.5A-M3/9AT operates as a unidirectional avalanche diode, conducting only in reverse bias above its breakdown threshold to shunt transient energy to ground. Its glass-passivated junction ensures stable VBR tolerance and low leakage (ID ≤ 100 µA at VWM), while the SMC package supports automated placement and meets UL 94 V-0 flammability rating.
It delivers fast response time (< 1 ns), low incremental surge resistance, and is rated for -55 °C to +150 °C operating junction temperature. The device is not bidirectional - polarity is marked by a cathode band, and forward voltage drop is 3.5 V at 100 A (per datasheet note 6).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 8.33 V / 9.21 V at IT = 1.0 mA - defines reliable turn-on threshold with ±5.3% tolerance |
| VC @ IPPM | 12.9 V at 116.3 A - clamping voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 1500 W - peak transient power it can absorb without failure under standardized waveform |
| ID @ VWM | ≤ 100 µA - ultra-low reverse leakage preserves signal integrity and battery life in standby |
| TJ max | +150 °C - enables operation in under-hood automotive or high-temperature industrial environments |
| Package | SMC (DO-214AB) - 8.13 mm × 6.22 mm footprint with 3.20 mm height, optimized for thermal dissipation on 8 mm × 8 mm copper pads |
Pinout & Package
SMCJ7.5A-M3/9AT uses the standard SMC (DO-214AB) surface-mount package: two-terminal, unidirectional configuration with cathode identified by a visible band. Leads are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional protection layout |
| Cathode | Reverse-bias clamping terminal | Connected to protected line (e.g., 5 V rail or sensor input); band-marked end absorbs positive transients |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction | M3 suffix confirms full compliance with JEDEC J-STD-201 Class 2 whisker resistance and environmental regulations |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR = ~4.6 V), reducing voltage overshoot on sensitive ICs during ESD/EFT events |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow up to 260 °C peak without baking, simplifying SMT manufacturing |
| Glass passivated junction | Ensures long-term stability of VBR and leakage across temperature and lifetime, critical for automotive reliability |
| 1500 W peak pulse power rating | Withstands IEC 61000-4-5 surge levels up to 4 kV (line-to-earth) in properly designed PCB layouts |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamping |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges > 25 V. Use Value: Limits voltage to ≤12.9 V during 116 A transients, preventing damage to MCU power inputs and CAN transceivers. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in PLC modules. IC Role / Device Role / Timing Role: TVS connected across sensor output and ground to suppress EFT bursts induced by nearby motor switching. Use Value: Sub-13 V clamping preserves ADC reference integrity and avoids false readings during 1 kV/50 Ω EFT testing. |
| Consumer USB Port Surge Suppression | Telecom DC Power Input Protection |
|
Use Scenario: Adding transient immunity to 5 V USB VBUS lines in set-top boxes and docking stations. IC Role / Device Role / Timing Role: SMCJ7.5A-M3/9AT installed upstream of USB controller ICs to absorb hot-swap and ESD events. Use Value: 12.9 V VC ensures USB PHY remains within absolute maximum ratings even during 1500 W surges. |
Use Scenario: Front-end protection for 48 V telecom rectifier outputs feeding base station backplanes. IC Role / Device Role / Timing Role: Used in parallel with higher-voltage TVS or MOVs to handle fast-rising edge transients before slower devices respond. Use Value: <1 ns response captures initial voltage spike, reducing stress on downstream DC-DC converters and PMICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5A-M3 | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (~110 °C/W) | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 level 4 compliance | Select when board space is constrained and surge requirements are ≤400 W |
| SMCJ7.5CA-M3/9AT | Bidirectional variant; same VWM (7.5 V), symmetric clamping in both polarities; ID doubled (200 µA) | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, audio) | Choose for bidirectional protection needs - not a drop-in replacement due to polarity symmetry |
Compared with SMAJ7.5A-M3, the SMCJ7.5A-M3/9AT delivers 275% higher surge power handling and superior thermal performance; versus SMCJ7.5CA-M3/9AT, it offers tighter leakage control and optimized unidirectional clamping but cannot protect against negative-going transients.
Availability
SMCJ7.5A-M3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, consumer power port protection, and telecom DC input stages requiring stable component supply and halogen-free compliance.
Supply support for SMCJ7.5A-M3/9AT 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and communications systems where robustness against ISO 7637-2 and IEC 61000-4-5 threats is mandatory.
FAQ
What is the clamping voltage of SMCJ7.5A-M3/9AT at its rated peak pulse current?
The SMCJ7.5A-M3/9AT has a maximum clamping voltage (VC) of 12.9 V when subjected to its rated peak pulse current (IPPM) of 116.3 A using a 10/1000 µs waveform. This value is measured under standardized test conditions with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal, ensuring repeatable thermal performance. The SMCJ7.5A-M3/9AT maintains this clamping performance across its specified operating temperature range.
Is SMCJ7.5A-M3/9AT suitable for automotive applications?
The SMCJ7.5A-M3/9AT itself is commercial-grade (M3 suffix), not AEC-Q101 qualified. However, Vishay offers the functionally identical SMCJ7.5A-HM3_X variant (e.g., SMCJ7.5A-HM3_A/I) that is AEC-Q101 qualified and shares the same electrical characteristics, package, and marking. For automotive use, specify the HM3_X version - the SMCJ7.5A-M3/9AT is appropriate for non-automotive industrial or consumer designs requiring halogen-free RoHS compliance.
What does the "M3" suffix mean in SMCJ7.5A-M3/9AT?
The "M3" suffix in SMCJ7.5A-M3/9AT indicates halogen-free, RoHS-compliant construction meeting JEDEC J-STD-201 Class 2 whisker resistance requirements. It also denotes commercial-grade qualification (not AEC-Q101). This differs from "E3" (RoHS-compliant, non-halogen-free) and "HM3" (halogen-free + AEC-Q101 qualified). The M3 suffix ensures compatibility with lead-free reflow profiles up to 260 °C and satisfies environmental mandates for global electronics manufacturing.
How does SMCJ7.5A-M3/9AT compare to SMCJ7.5CA-M3/9AT?
The SMCJ7.5A-M3/9AT is unidirectional, with polarity marked by a cathode band and optimized for clamping positive transients on grounded systems. The SMCJ7.5CA-M3/9AT is bidirectional, offering symmetric clamping for AC or floating lines, with double the maximum leakage current (200 µA vs. 100 µA) and no polarity marking. They share identical VWM (7.5 V), PPPM (1500 W), and package, but are not interchangeable without circuit review due to fundamental polarity differences.
What is the thermal resistance of SMCJ7.5A-M3/9AT, and how does it affect layout?
The SMCJ7.5A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended pad layout (0.31″ × 0.31″ copper pads per terminal). To maintain safe junction temperatures under repeated surges, PCB layout must provide adequate copper area and avoid excessive trace length or isolation. Derating curves in the datasheet show power capability drops significantly above 25 °C ambient - proper thermal design ensures the SMCJ7.5A-M3/9AT sustains its 1500 W rating in real-world conditions.
SMCJ7.5A-M3/9AT 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 (SMC)
SMCJ7.5A-M3/9AT FAQ
1.How can I place an order for SMCJ7.5A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ7.5A-M3/9AT 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-M3/9AT reliable?
The price and inventory of SMCJ7.5A-M3/9AT 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-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ7.5A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ7.5A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ7.5A-M3/9AT?
SMCJ7.5A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ7.5A-M3/9AT 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-M3/9AT?
For technical support, including SMCJ7.5A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ7.5A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ7.5A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ7.5A-M3/9AT 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-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ7.5A-M3/9AT?
All SMCJ7.5A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ7.5A-M3/9AT, 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-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ7.5A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ7.5A-M3/9AT Tags
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Diodes Incorporated
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