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Vishay General Semiconductor - Diodes Division SMAJ7.0A-M3/5A
- Part No.:
- SMAJ7.0A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0A-M3/5A.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,222
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Product details
Overview
SMAJ7.0A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast-rising voltage transients on power and signal lines. It features a 7.0 V stand-off voltage (VWM), 7.78–8.60 V breakdown voltage (VBR) at 10 mA, and clamps to ≤12.0 V at 33.3 A peak pulse current (IPPM) under 10/1000 μs waveform - protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ7.0A-M3/5A datasheet, SMAJ7.0A-M3/5A pinout, SMAJ7.0A-M3/5A application, or SMAJ7.0A-M3/5A equivalent, key selection criteria include its 400 W peak pulse power rating, low 0.065 %/°C VBR temperature coefficient, unidirectional polarity with cathode band marking, and halogen-free RoHS-compliant M3 termination - critical for high-reliability PCB layouts subject to ESD, load dump, and inductive switching events.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<800 μA at 7.0 V), while the SMA package enables automated placement and meets MSL Level 1 reflow requirements up to 260 °C.
It delivers 400 W peak pulse power (10/1000 μs) at TA = 25 °C, derating linearly above 25 °C per Fig. 2, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). The device is rated for -55 °C to +150 °C operating junction temperature and supports 40 A non-repetitive forward surge current (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - maximum continuous reverse working voltage before significant leakage; sets upper limit for safe operation in 5 V–7 V rail protection. |
| VBR (min/max) | 7.78 V / 8.60 V at 10 mA - defines precise avalanche onset range; ensures consistent clamping across production lots. |
| VC @ IPPM | ≤12.0 V at 33.3 A - clamped voltage during 10/1000 μs surge; guarantees downstream ICs see <12 V stress even under full-rated transient. |
| PPPM | 400 W - peak pulse power handling capability; sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| IFSM | 40 A - single half-sine surge rating (8.3 ms); supports robust protection against motor-switching or relay-coil turn-off spikes. |
| TJ max | +150 °C - maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - standardized surface-mount outline with 5.28 mm × 4.93 mm footprint; compatible with IPC-7351B land patterns. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side connection | Connected to ground or lower-potential node in unidirectional configuration; must be routed with low-inductance path for effective clamping. |
| Cathode | Reverse-biased terminal / protected line connection | Connected to the line being protected (e.g., 5 V supply rail); cathode band identifies this terminal visually and on silkscreen. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with automotive load-dump and industrial surge immunity standards without external heat sinking. |
| Glass passivated chip junction | Ensures stable VBR over time and temperature, with minimal parameter drift during repeated transient events. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance mandates for automotive and EU industrial equipment without compromising solderability or reliability. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly processes without preconditioning or special handling. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast transients, improving protection margin for 3.3 V and 5 V logic interfaces. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 5 V microcontroller power inputs against load-dump transients (ISO 7637-2 Pulse 5a) in vehicle body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VCC and GND, clamping surges within nanoseconds to prevent latch-up or permanent damage. Use Value: Clamps to ≤12.0 V at 33.3 A, maintaining safe headroom below the 16 V absolute maximum rating of typical automotive MCUs. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA transmitter) from ESD and field-wiring faults in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: TVS mounted at connector entry point, shunting fast transients before they reach precision DAC or op-amp circuitry. Use Value: 7.0 V VWM allows uninterrupted operation during normal 5 V/12 V signaling while reacting in <1 ns to >8 kV contact ESD per IEC 61000-4-2. |
| Consumer USB Port ESD Protection | Telecom DC Power Input Protection |
Use Scenario: Adding secondary-level surge suppression on VBUS line of USB 2.0 host ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB power switch, absorbing repetitive ESD events without degradation. Use Value: 800 μA max leakage at 7.0 V avoids loading the 5 V rail; low capacitance (~500 pF) prevents signal integrity issues on 480 Mbps data paths. |
Use Scenario: Protecting -48 V telecom rectifier outputs from lightning-induced surges on central office power distribution boards. IC Role / Device Role / Timing Role: Unidirectional TVS configured with cathode to -48 V rail and anode to chassis ground, clamping negative-going transients. Use Value: 400 W rating handles multi-kA induced surges; 150 °C TJ max ensures stability in sealed, high-temp telecom enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0A-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3 termination). | Preferred for commercial-grade designs where halogen-free requirement is not mandated. | Select SMAJ7.0A-E3/5A when cost optimization is prioritized and halogen-free certification is unnecessary. |
| SMAJ7.0AHE3_A/I | Identical electrical parameters plus AEC-Q101 qualification; uses HE3 suffix and I-tape packaging. | Required for automotive safety-critical ECUs needing qualified components per ISO/TS 16949. | Choose SMAJ7.0AHE3_A/I only when AEC-Q101 validation and traceable automotive lot documentation are mandatory. |
Compared with SMAJ7.0A-E3/5A, the SMAJ7.0A-M3/5A offers halogen-free compliance without sacrificing clamping performance or thermal capability; versus SMAJ7.0AHE3_A/I, it omits AEC-Q101 qualification but retains identical surge ratings and footprint - making it optimal for cost-sensitive industrial and consumer applications requiring environmental compliance.
Availability
SMAJ7.0A-M3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, consumer USB port ESD suppression, and telecom DC input surge mitigation requiring stable component supply and halogen-free material compliance.
Supply support for SMAJ7.0A-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for robust transient suppression in automotive, industrial, and communications infrastructure where fast response, high surge capacity, and long-term stability are essential.
FAQ
What is the clamping voltage of SMAJ7.0A-M3/5A at its rated peak pulse current?
The SMAJ7.0A-M3/5A clamps to a maximum of 12.0 V at its rated peak pulse current of 33.3 A under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and represents the upper bound of voltage seen by protected circuitry during worst-case surge events - a critical parameter for ensuring compatibility with downstream IC voltage tolerances. The SMAJ7.0A-M3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ7.0A-M3/5A suitable for bidirectional transient protection?
No, SMAJ7.0A-M3/5A is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only in reverse bias (cathode positive) and blocks forward current. For bidirectional protection, the SMAJ7.0CA variant must be used - which has symmetric breakdown in both directions and no polarity marking. Using SMAJ7.0A-M3/5A in bidirectional applications risks forward conduction and failure during positive transients.
What does the "M3" suffix mean in SMAJ7.0A-M3/5A?
The "M3" suffix in SMAJ7.0A-M3/5A denotes halogen-free, RoHS-compliant construction with matte tin-plated leads meeting J-STD-002 and JESD 22-B102 solderability standards. It also satisfies JESD 201 Class 2 whisker resistance requirements. This distinguishes it from the "E3" variant (RoHS-compliant but not halogen-free) and "HM3" variants (halogen-free + AEC-Q101 qualified). The M3 designation confirms compliance with strict environmental regulations in consumer and industrial markets.
Can SMAJ7.0A-M3/5A be used in place of SMAJ6.0A or SMAJ8.0A?
SMAJ7.0A-M3/5A is not a direct replacement for SMAJ6.0A or SMAJ8.0A due to differences in stand-off voltage (VWM = 7.0 V vs. 6.0 V or 8.0 V) and corresponding breakdown ranges. Substituting requires verifying that the protected circuit's normal operating voltage remains safely below VWM with adequate margin - e.g., SMAJ6.0A suits 5 V rails with tighter tolerance, while SMAJ8.0A better fits 6–7 V systems. The SMAJ7.0A-M3/5A is optimized for nominal 7 V applications such as certain automotive sensors and industrial 5 V/7 V hybrid supplies.
What is the maximum leakage current of SMAJ7.0A-M3/5A at its stand-off voltage?
The maximum reverse leakage current (ID) of SMAJ7.0A-M3/5A is 800 μA at its stand-off voltage of 7.0 V and TA = 25 °C. This value is specified in the Vishay datasheet and reflects worst-case leakage under rated DC bias - critical for low-power battery-operated systems where standby current must be minimized. Leakage increases with temperature but remains within design-safe limits up to 125 °C junction temperature.
SMAJ7.0A-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):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 33.3A
- 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)
SMAJ7.0A-M3/5A FAQ
1.How can I place an order for SMAJ7.0A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0A-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 SMAJ7.0A-M3/5A reliable?
The price and inventory of SMAJ7.0A-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 SMAJ7.0A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.0A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0A-M3/5A?
SMAJ7.0A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0A-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 SMAJ7.0A-M3/5A?
For technical support, including SMAJ7.0A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0A-M3/5A requirements.
6.How does Aetrix verify that SMAJ7.0A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0A-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 SMAJ7.0A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.0A-M3/5A?
All SMAJ7.0A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0A-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 SMAJ7.0A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.0A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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