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Vishay General Semiconductor - Diodes Division SMCJ7.5A-M3/57T
- Part No.:
- SMCJ7.5A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ7.5A-M3/57T.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,237
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Product details
Overview
SMCJ7.5A-M3/57T 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 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMCJ7.5A-M3/57T datasheet, SMCJ7.5A-M3/57T pinout, SMCJ7.5A-M3/57T application, or SMCJ7.5A-M3/57T equivalent, key selection criteria include unidirectional polarity, halogen-free RoHS-compliant M3 suffix, 1500 W surge capability, -55 °C to +150 °C operating junction temperature, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ7.5A-M3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering sub-nanosecond response to transient overvoltages. Its low incremental surge resistance and excellent clamping ratio (VC/VBR ≈ 1.55) ensure minimal let-through energy during ESD or inductive switching events.
Designed for unidirectional protection only, it exhibits 100 μA maximum reverse leakage at VWM = 7.5 V and a positive temperature coefficient of VBR (+0.067 %/°C), enabling stable performance across temperature. Mounting on specified 0.31" × 0.31" copper pads ensures rated 1500 W PPPM dissipation per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 8.33 V / 9.21 V at IT = 1.0 mA - Confirmed avalanche onset range; ensures predictable turn-on under transient stress. |
| VC @ IPPM | 12.9 V at 116.3 A - Clamped voltage during full 1500 W surge; limits downstream device stress to safe levels. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 μs waveform; validates robustness against IEC 61000-4-5 Level 4 surges. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 8.13 mm footprint and 3.20 mm height; compatible with IPC-7351B land patterns. |
| Polarity | Unidirectional - Cathode marked by band; blocks forward conduction above ~3.5 V (VF = 3.5 V at IF = 100 A), conducts only in reverse avalanche mode. |
Pinout & Package
SMCJ7.5A-M3/57T uses the SMC (DO-214AB) package: a molded plastic case with two coplanar matte tin-plated leads, compliant with J-STD-002 solderability and JESD22-B102 whisker testing. Polarity is indicated by a cathode band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; carries surge current during reverse-biased clamping. |
| Cathode | Avalanche clamping terminal | Marked by band; connected to higher-potential side (e.g., VCC rail); initiates avalanche breakdown when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction | M3 suffix confirms compliance with IEC 61249-2-21 and JEDEC JS709E, supporting green manufacturing and end-of-life recycling. |
| MSL Level 1 rating | Rated for unlimited floor life at ≤30 °C/85 % RH; enables direct placement without baking or dry-pack requirements. |
| Low incremental surge resistance | Enables tight VC/VBR ratio (1.55), minimizing voltage overshoot and protecting sensitive 5 V or 3.3 V logic interfaces. |
| AEC-Q101 qualification option | Available in HM3 variant (e.g., SMCJ7.5AHM3/57T); validated for automotive powertrain and body electronics applications. |
| Glass passivated junction | Provides stable, repeatable avalanche characteristics over 1000+ surge events and extended thermal cycling life. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump transients up to 35 V and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, clamping surges before they reach LDOs and microcontrollers. Use Value: Limits clamped voltage to 12.9 V, ensuring downstream 16 V-rated input regulators remain within safe SOA during 1500 W transients. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC modules from EFT and ESD. IC Role / Device Role / Timing Role: TVS mounted at connector entry point on 24 V signal lines, shunting fast transients before reaching op-amp front-ends. Use Value: Sub-ns response and 100 μA leakage at 7.5 V preserve signal integrity and offset accuracy in precision 4–20 mA loops. |
| DC-DC Converter Input Protection | Consumer USB Power Path Protection |
|
Use Scenario: Safeguarding buck converter inputs in telecom power systems exposed to lightning-induced surges on 48 V backplanes. IC Role / Device Role / Timing Role: Primary-level TVS on HV input rail, coordinated with upstream fuses and downstream MOVs for staged protection. Use Value: 1500 W PPPM rating handles multi-kA induced surges while maintaining <13 V clamping to prevent MOSFET gate oxide failure. |
Use Scenario: Adding secondary overvoltage protection on USB-C VBUS lines in portable chargers where primary OVP may fail. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to VBUS, triggered only during overvoltage events exceeding 7.5 V. Use Value: Low VWM avoids interference with normal 5 V ±5 % USB operation while reacting within 1 ns to 20 V+ faults. |
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-M3 | Lower PPPM (400 W), smaller SMA (DO-214AC) package, same VWM/VBR/VC specs. | Suitable for space-constrained consumer PCBs but insufficient for automotive load-dump or industrial surge immunity. | Select SMAJ7.5A-M3 only when surge energy is limited to <400 W and board area is critical. |
| SMCJ7.5CA-M3/57T | Bidirectional variant with identical VWM/VBR/PPPM, but symmetric clamping in both polarities; no cathode marking. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs. | Choose SMCJ7.5CA-M3/57T only when bidirectional protection is mandated by interface standard or circuit topology. |
Compared with SMAJ7.5A-M3 and SMCJ7.5CA-M3/57T, the SMCJ7.5A-M3/57T uniquely balances 1500 W surge capacity, unidirectional polarity, and SMC package thermal performance - making it optimal for high-energy DC rail protection where directional clamping suffices and layout space permits.
Availability
SMCJ7.5A-M3/57T is available at Aetrix Electronics and suitable for automotive power distribution units, industrial PLC I/O modules, and DC-DC converter front-end protection requiring stable component supply, halogen-free compliance, and AEC-Q101-qualified traceability.
Supply support for SMCJ7.5A-M3/57T 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, power efficiency, and automotive-grade qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where sustained surge immunity and long-term parametric stability are mandatory.
FAQ
What is the maximum clamping voltage of the SMCJ7.5A-M3/57T under full-rated surge conditions?
The SMCJ7.5A-M3/57T has a maximum clamping voltage (VC) of 12.9 V when subjected to its rated 116.3 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88394. The SMCJ7.5A-M3/57T maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) when mounted on the recommended 8.0 mm × 8.0 mm copper pads.
Is the SMCJ7.5A-M3/57T suitable for automotive applications?
Yes - the base SMCJ7.5A-M3/57T is halogen-free and RoHS-compliant, and an AEC-Q101-qualified version (SMCJ7.5AHM3/57T) is available for automotive use. While the M3 suffix alone does not imply qualification, the underlying die and SMC package meet the mechanical and thermal requirements for under-hood deployment. Engineers must specify HM3 for certified automotive grade; the SMCJ7.5A-M3/57T itself is widely used in non-safety-critical automotive subsystems such as infotainment power rails and body control modules.
How does the SMCJ7.5A-M3/57T differ from the SMCJ7.5CA-M3/57T?
The SMCJ7.5A-M3/57T is unidirectional with cathode band marking and conducts only in reverse avalanche mode, whereas the SMCJ7.5CA-M3/57T is bidirectional with symmetrical breakdown in both polarities and no polarity marking. Both share identical VWM (7.5 V), VBR (8.33–9.21 V), VC (12.9 V), and PPPM (1500 W), but the CA variant is required for AC signals or floating buses like CAN or RS-485. The SMCJ7.5A-M3/57T is preferred for DC power rail protection where polarity is fixed and layout simplicity matters.
What is the thermal resistance and derating behavior of the SMCJ7.5A-M3/57T?
The SMCJ7.5A-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended pad layout, and junction-to-lead (RθJL) of 15 °C/W. Its peak pulse power must be derated linearly above TA = 25 °C per Figure 2 in the datasheet - e.g., at 75 °C ambient, PPPM drops to ~1125 W. Full 1500 W rating assumes 25 °C ambient and proper 0.31" × 0.31" copper pads. The SMCJ7.5A-M3/57T remains functional up to TJ = 150 °C, with VBR increasing predictably at +0.067 %/°C.
Does the SMCJ7.5A-M3/57T require a heatsink for continuous operation?
No - the SMCJ7.5A-M3/57T is not intended for continuous power dissipation. Its 6.5 W steady-state power rating (PD) applies only with infinite heatsink at TA = 50 °C, and real-world operation relies on transient duty cycle (e.g., single 10/1000 μs pulses). For repeated surges, thermal recovery time and PCB copper mass dominate cooling. The SMCJ7.5A-M3/57T leverages its SMC package's low RθJL (15 °C/W) to rapidly dump surge energy into PCB traces; no external heatsink is needed or recommended.
SMCJ7.5A-M3/57T 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-M3/57T FAQ
1.How can I place an order for SMCJ7.5A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ7.5A-M3/57T 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-M3/57T reliable?
The price and inventory of SMCJ7.5A-M3/57T 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-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ7.5A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ7.5A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ7.5A-M3/57T?
SMCJ7.5A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ7.5A-M3/57T 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-M3/57T?
For technical support, including SMCJ7.5A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ7.5A-M3/57T requirements.
6.How does Aetrix verify that SMCJ7.5A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ7.5A-M3/57T 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-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ7.5A-M3/57T?
All SMCJ7.5A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ7.5A-M3/57T, 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-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ7.5A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ7.5A-M3/57T Tags
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