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Vishay General Semiconductor - Diodes Division SMAJ7.0A-E3/5A
- Part No.:
- SMAJ7.0A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0A-E3/5A.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ7.0A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection of sensitive ICs, MOSFETs, 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 transients to ≤12.0 V at 33.3 A peak pulse current (IPPM) under 10/1000 μs waveform - used in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ7.0A-E3/5A datasheet, SMAJ7.0A-E3/5A pinout, SMAJ7.0A-E3/5A application, or SMAJ7.0A-E3/5A equivalent, key selection criteria include its 400 W peak pulse power rating (≤78 V), 0.065 %/°C temperature coefficient of VBR, unidirectional polarity with cathode band marking, and SMA (DO-214AC) package compatibility with automated SMT assembly.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM = 7.0 V and rapidly transitions to low-impedance conduction above VBR (min 7.78 V), limiting transient-induced voltage excursions across protected nodes. Its glass-passivated junction ensures stable leakage (<800 μA at VWM) and repeatable breakdown behavior.
Designed for surge immunity per IEC 61000-4-5 (indirect lightning) and ISO 7637-2 (automotive load dump), it delivers 33.3 A peak pulse current capability with <1 ps response time and low incremental surge resistance - critical for protecting low-voltage logic inputs and analog front-ends without signal distortion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse operating voltage before significant leakage begins; sets upper limit for normal circuit operation. |
| VBR (min/max) | 7.78 V / 8.60 V at 10 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM while avoiding false triggering. |
| VC @ IPPM | ≤12.0 V at 33.3 A - Clamping voltage defines worst-case stress on downstream components during 10/1000 μs surge events. |
| PPPM | 400 W - Peak pulse power handling capacity with 10/1000 μs waveform; derates linearly above TA = 25 °C per Fig. 2. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine), supporting robustness against inductive switch-off spikes. |
| TJ max. | +150 °C - Maximum junction temperature enables use in under-hood automotive and high-ambient industrial environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. Polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to lower-potential side of protected line; conducts during positive transients when cathode is biased higher. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to higher-potential rail (e.g., VCC or signal line); initiates clamping when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against severe ESD and lightning-induced surges without thermal runaway in compact layouts. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping - critical for safeguarding 3.3 V and 5 V logic interfaces. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT reflow profiles without moisture-related popcorn failure or delamination. |
| 0.065 %/°C VBR tempco | Ensures predictable breakdown shift over temperature - simplifies design margining for automotive (-40 to +125 °C ambient) use. |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground to clamp negative-going spikes and between VCC and signal to clamp positive excursions. Use Value: Limits transient voltage to ≤12.0 V, preventing latch-up or gate oxide damage in 5 V tolerant transceivers and ADC front-ends. | Use Scenario: Shielding digital input modules from inductive kickback generated by solenoid and relay coil switching in factory automation systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input channels, mounted directly at connector entry point to minimize trace inductance. Use Value: Absorbs 400 W surge energy without degradation, maintaining signal integrity and eliminating need for secondary filtering stages. |
| Consumer Power Adapter Output | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side transient suppression on 5 V/9 V USB-C PD adapter outputs exposed to system-level ESD and cable coupling events. IC Role / Device Role / Timing Role: Fast-response shunt device across output rails, triggered within picoseconds to divert surge current before regulator or load IC sees overvoltage. Use Value: Achieves <12.0 V clamping at full 33.3 A surge, ensuring compliance with IEC 61000-4-2 Level 4 (15 kV air/8 kV contact) requirements. | Use Scenario: Front-end protection for Ethernet PHYs and DSL line drivers subjected to induced surges from nearby AC mains or lightning strikes. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 7.0 V) placed in series with common-mode chokes to suppress differential-mode transients on data pairs. Use Value: Provides repeatable 400 W surge handling with <800 μA leakage at 7.0 V - preserving signal-to-noise ratio in high-speed analog links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0AHE3_A/I | AEC-Q101 qualified; identical electrical specs but validated for automotive-grade reliability and extended temperature cycling. | Required for ASIL-B functional safety paths and under-hood ECUs where qualification evidence is mandatory. | Select SMAJ7.0AHE3_A/I when automotive OEM compliance documentation (PPAP, test reports) is required; otherwise SMAJ7.0A-E3/5A suffices for commercial/industrial use. |
| SMBJ7.0A-E3/52 | Same VWM/VBR/VC specs but in SMB (DO-214AA) package - 2.6 mm wider body, 1.6 mm higher profile, 10% higher thermal resistance (RθJA = 130 °C/W). | Better suited for manual repair or high-power derating scenarios where PCB real estate allows larger footprint. | Choose SMBJ7.0A-E3/52 only if layout constraints permit larger pad area and thermal management requires lower junction temperature rise per watt. |
Compared with SMAJ7.0AHE3_A/I, the SMAJ7.0A-E3/5A offers identical clamping performance and surge rating at lower cost and broader commercial availability, while the SMBJ7.0A-E3/52 trades compactness for marginally improved thermal dissipation - making the SMAJ7.0A-E3/5A optimal for space-constrained, high-volume SMT designs requiring proven reliability without automotive certification overhead.
Availability
SMAJ7.0A-E3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and consumer power adapter output circuits requiring stable component supply, consistent RoHS-compliant sourcing, and tape-and-reel delivery for high-speed pick-and-place assembly.
Supply support for SMAJ7.0A-E3/5A 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh electromagnetic environments - targeting automotive, industrial control, and telecom infrastructure where fast, repeatable clamping and long-term parametric stability are non-negotiable.
FAQ
What is the maximum clamping voltage of the SMAJ7.0A-E3/5A under a 10/1000 μs surge?
The SMAJ7.0A-E3/5A has a maximum clamping voltage (VC) of 12.0 V when subjected to its rated peak pulse current of 33.3 A with a 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ7.0A-E3/5A maintains this clamping performance across its full operating temperature range.
Does the SMAJ7.0A-E3/5A meet automotive qualification standards?
No - the SMAJ7.0A-E3/5A is a commercial-grade, RoHS-compliant part (E3 suffix) and is not AEC-Q101 qualified. For automotive applications requiring formal qualification, Vishay offers the SMAJ7.0AHE3_A/I variant, which carries the HE3 suffix and full AEC-Q101 documentation. The SMAJ7.0A-E3/5A remains suitable for non-safety-critical automotive subsystems where qualification is not mandated, such as infotainment power rails or cabin sensor interfaces.
What is the standoff voltage and why does it matter for SMAJ7.0A-E3/5A placement?
The standoff voltage (VWM) of the SMAJ7.0A-E3/5A is 7.0 V - the maximum DC or continuous reverse voltage the device can block without entering conduction. This parameter dictates placement relative to system operating voltage: it must exceed the highest normal operating voltage on the protected line (e.g., 5 V logic rail) by ≥10–20 % to prevent leakage-induced power loss or false triggering. For a 5 V rail, the SMAJ7.0A-E3/5A provides appropriate margin; for 12 V systems, a higher-VWM variant like SMAJ12A would be required.
How does the thermal resistance of SMAJ7.0A-E3/5A affect its power handling in real PCB layouts?
The SMAJ7.0A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended pad layout (0.2" × 0.2" copper per terminal). In practice, this means each watt of sustained power dissipation raises the junction temperature by ~120 °C above ambient - so at 25 °C ambient, even 0.5 W continuous dissipation risks exceeding the 150 °C TJ max. Hence, the SMAJ7.0A-E3/5A is intended for transient-only duty; its 400 W rating applies only to short-duration pulses (≤50 ms), not steady-state conditions.
Can SMAJ7.0A-E3/5A be used in bidirectional signal protection applications?
No - the SMAJ7.0A-E3/5A is strictly unidirectional, as indicated by the "A" suffix and cathode band marking. For bidirectional protection (e.g., AC-coupled data lines or symmetrical buses), the SMAJ7.0CA variant must be used. Attempting to use the SMAJ7.0A-E3/5A in reverse-biased configurations will result in forward conduction and potential damage. Always verify suffix: "A" = unidirectional, "CA" = bidirectional - the SMAJ7.0A-E3/5A supports only single-polarity clamping.
SMAJ7.0A-E3/5A 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-E3/5A FAQ
1.How can I place an order for SMAJ7.0A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0A-E3/5A 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-E3/5A reliable?
The price and inventory of SMAJ7.0A-E3/5A 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-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.0A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0A-E3/5A?
SMAJ7.0A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0A-E3/5A 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-E3/5A?
For technical support, including SMAJ7.0A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0A-E3/5A requirements.
6.How does Aetrix verify that SMAJ7.0A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0A-E3/5A 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-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.0A-E3/5A?
All SMAJ7.0A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0A-E3/5A, 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-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.0A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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