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Vishay General Semiconductor - Diodes Division SMAJ7.5A-M3/5A
- Part No.:
- SMAJ7.5A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5A-M3/5A.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,144
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Product details
Overview
SMAJ7.5A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) 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 31.0 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ7.5A-M3/5A datasheet, SMAJ7.5A-M3/5A pinout, SMAJ7.5A-M3/5A application, or SMAJ7.5A-M3/5A equivalent, key selection criteria include clamping performance under 31.0 A surge, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking (cathode band), RoHS-compliant halogen-free construction (M3 suffix), and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protection device that clamps transient overvoltages above its breakdown threshold while maintaining low leakage (<100 μA at 7.5 V) during normal operation. Its glass-passivated junction ensures stable VBR tolerance (±5%) and robust surge handling up to 40 A IFSM (8.3 ms half-sine).
The device is rated for continuous operation from −55 °C to +150 °C junction temperature, with thermal resistance of 30 °C/W junction-to-lead and 120 °C/W junction-to-ambient (on 5.0 mm × 5.0 mm copper pads). It meets MSL Level 1 per J-STD-020 and supports reflow soldering up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum reverse working voltage before significant conduction; defines safe operating margin below clamping threshold. |
| VBR min/max | 8.33 V / 9.21 V at 1.0 mA - Confirmed breakdown range ensuring reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 12.9 V at 31.0 A - Clamping voltage under 10/1000 μs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 400 W - Peak pulse power dissipation capability; enables protection against high-energy transients like EFT or lightning-induced surges. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against inrush or fault currents. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in automotive under-hood and industrial environments. |
| RθJA | 120 °C/W - Thermal resistance to ambient on standard 5.0 mm × 5.0 mm copper pads; informs derating requirements for sustained power dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to ground or low-side reference; forms shunt path when transient exceeds VBR. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line (e.g., VCC, signal); blocks normal operation but conducts during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against high-energy transients such as ISO 7637-2 Pulse 1/2a/5a without degradation under repetitive stress. |
| 12.9 V clamping at 31.0 A | Limits voltage stress on downstream 5 V logic ICs or MOSFET gate drivers during surge events, preserving functional integrity. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for consumer, industrial, and automotive electronics without compromising surge performance. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without moisture-related popcorning or delamination risks. |
| Glass passivated chip junction | Ensures stable VBR tolerance (±5%), low leakage (<100 μA), and long-term reliability under thermal cycling and humidity exposure. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between power rail and chassis ground to clamp spikes up to 400 W. Use Value: Limits voltage excursion to ≤12.9 V during 31.0 A surges, preventing latch-up or gate oxide damage in microcontrollers and CAN transceivers. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in PLC I/O modules exposed to field wiring transients. IC Role / Device Role / Timing Role: Unidirectional TVS connected across differential signal pair or single-ended output to ground. Use Value: Maintains signal fidelity by clamping ESD and inductive kickback to <13 V while adding <100 μA leakage at 7.5 V DC bias. |
| Consumer USB Port ESD Protection | Telecom DSL Line Surge Suppression |
|
Use Scenario: Secondary-level protection on USB VBUS lines after primary polymer PTC or fuse. IC Role / Device Role / Timing Role: Fast-response shunt device absorbing 8 kV HBM ESD pulses and 10/1000 μs surges from hot-plug events. Use Value: Achieves sub-1 ns response time and 12.9 V clamping to prevent damage to USB controller PHYs rated for 5.5 V absolute maximum. |
Use Scenario: Front-end protection on ADSL/VDSL line cards subjected to lightning-induced surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Unidirectional TVS placed between line transformer secondary and codec input, referenced to system ground. Use Value: Handles 400 W peak pulse energy while maintaining low capacitance (<100 pF at 0 V), minimizing signal distortion on 30 MHz DSL bands. |
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-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs M3 suffix). | Preferred for commercial-grade designs where halogen-free requirement is not mandated. | Select when cost sensitivity outweighs halogen-free compliance; identical footprint and assembly process. |
| SMBJ7.5A-M3 | Higher 600 W PPPM, larger SMB (DO-214AA) package, same VWM/VC ratings. | Better suited for higher-energy transients or designs requiring greater thermal margin. | Choose when surge energy exceeds 400 W or board layout allows larger 4.58 mm × 3.94 mm footprint. |
Compared with SMAJ7.5A-M3/5A, SMAJ7.5A-E3/5A offers identical protection performance with standard RoHS compliance, while SMBJ7.5A-M3 provides 50% higher pulse power in a physically larger package-enabling design flexibility for varying surge severity and thermal constraints.
Availability
SMAJ7.5A-M3/5A is available at Aetrix Electronics and suitable for automotive ECU power rails, industrial sensor interfaces, consumer USB ports, and telecom DSL line cards requiring stable component supply with halogen-free compliance and AEC-Q101 readiness.
Supply support for SMAJ7.5A-M3/5A 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 optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where fast clamping, high surge tolerance, and long-term stability are critical.
FAQ
What is the clamping voltage of SMAJ7.5A-M3/5A at its rated peak pulse current?
The SMAJ7.5A-M3/5A has a maximum clamping voltage (VC) of 12.9 V at 31.0 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable voltage limiting during surge events, directly protecting downstream 5 V logic circuits and MOSFET gate drivers without exceeding their absolute maximum ratings.
Is SMAJ7.5A-M3/5A suitable for automotive applications?
Yes, SMAJ7.5A-M3/5A is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes (e.g., SMAJ7.5AHM3_A/I). The base SMAJ7.5A-M3/5A is commercial-grade but shares identical electrical characteristics, thermal performance, and construction-including glass-passivated junction and MSL Level 1 rating-making it suitable for non-safety-critical automotive subsystems like body control modules and infotainment power rails.
How does the M3 suffix affect the material composition of SMAJ7.5A-M3/5A?
The M3 suffix on SMAJ7.5A-M3/5A indicates halogen-free, RoHS-compliant construction per IEC 61249-2-21, with brominated flame retardants replaced by alternative chemistries. This maintains UL 94 V-0 flammability rating while eliminating chlorine and bromine content-critical for compliance in EU, China, and Japan markets where halogen restrictions apply to electronic assemblies.
What is the thermal resistance of SMAJ7.5A-M3/5A, and how does it impact PCB layout?
SMAJ7.5A-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under sustained power dissipation, designers must allocate adequate copper area and consider airflow or adjacent heat sources-especially important in enclosed automotive or industrial enclosures where ambient temperatures exceed 85 °C.
Can SMAJ7.5A-M3/5A be used in bidirectional configurations?
No, SMAJ7.5A-M3/5A is a unidirectional TVS diode, identified by the "A" suffix and cathode band marking. For bidirectional operation, the equivalent part is SMAJ7.5CA-M3/5A (with "CA" suffix), which provides symmetrical clamping in both polarities and no polarity marking. Using SMAJ7.5A-M3/5A in reverse-biased signal paths may result in unintended conduction or failure to suppress negative transients.
SMAJ7.5A-M3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- 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):
- 31A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ7.5A-M3/5A FAQ
1.How can I place an order for SMAJ7.5A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5A-M3/5A 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 SMAJ7.5A-M3/5A reliable?
The price and inventory of SMAJ7.5A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.5A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5A-M3/5A?
SMAJ7.5A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5A-M3/5A 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 SMAJ7.5A-M3/5A?
For technical support, including SMAJ7.5A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5A-M3/5A requirements.
6.How does Aetrix verify that SMAJ7.5A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5A-M3/5A 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 SMAJ7.5A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.5A-M3/5A?
All SMAJ7.5A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5A-M3/5A, 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 SMAJ7.5A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.5A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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