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Vishay General Semiconductor - Diodes Division SMAJ7.0CA-M3/5A
- Part No.:
- SMAJ7.0CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0CA-M3/5A.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ7.0CA-M3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 7.0 V stand-off voltage (VWM), 7.78–8.60 V breakdown voltage (VBR) at 10 mA, 12.0 V maximum clamping voltage (VC) at 33.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial electronics.
For engineers reviewing the SMAJ7.0CA-M3/5A datasheet, SMAJ7.0CA-M3/5A pinout, SMAJ7.0CA-M3/5A application, or SMAJ7.0CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, 12.0 V clamping at 33.3 A, SMA package thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification eligibility (via HM3 suffix), and compliance with UL 497B for surge protection systems.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VWM, and VC specifications in forward and reverse directions. Its glass-passivated junction enables fast response time (<1 ps) and low incremental surge resistance, critical for suppressing ESD and lightning-induced transients before sensitive downstream circuitry is damaged.
The device is rated for 400 W peak pulse power (10/1000 μs) up to 78 V; above that threshold, derating applies to 300 W. It supports operating junction temperatures from –55 °C to +150 °C and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak temperature tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse stand-off voltage before significant leakage; defines safe operating margin below clamping onset. |
| VBR (min/max) | 7.78 V / 8.60 V at 10 mA - Verified breakdown range ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 12.0 V at 33.3 A - Clamping voltage under full-rated 10/1000 μs surge; limits stress on protected ICs to safe levels. |
| PPPM | 400 W - Peak pulse power handling capacity with standard 10/1000 μs waveform; determines survivability against common transient threats. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); relevant for unidirectional variants only; not applicable here due to bidirectional configuration. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs PCB layout requirements for thermal management. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated terminals. No polarity marking for bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (either polarity) | One terminal of symmetrical junction; accepts surge current regardless of voltage polarity relative to cathode. |
| Cathode | Transient current exit (either polarity) | Second terminal of symmetrical junction; completes low-impedance path during clamping in both directions. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns - e.g., RS-485, CAN bus, or sensor differential pairs. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when properly mounted on recommended copper pads. |
| Low clamping ratio (VC/VWM ≈ 1.71) | Minimizes overvoltage exposure to protected devices - critical for 3.3 V or 5 V logic interfaces where margin is tight. |
| AEC-Q101 qualification option | HM3 suffix variant available for automotive applications requiring validated reliability under temperature cycling, humidity, and mechanical stress. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard SMT reflow without baking - reduces manufacturing overhead and avoids moisture-related popcorning. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of engine coolant temperature sensors exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across sensor output and ground to shunt transients before reaching ADC input stage. Use Value: Limits voltage excursion to ≤12.0 V during 33.3 A surge, preserving 12-bit ADC accuracy and preventing latch-up in microcontroller front-end circuitry. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers subject to inductive switching noise from solenoid valves. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing repetitive 10/1000 μs transients induced by relay coil de-energization. Use Value: Maintains channel integrity with <1 μA leakage at 7.0 V, ensuring stable logic-low detection while clamping spikes within 1 ns. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
|
Use Scenario: Shielding RS-485 transceiver data lines in outdoor base station equipment from lightning-induced surges. IC Role / Device Role / Timing Role: Differential pair protection using two SMAJ7.0CA-M3/5A devices (line-to-ground) to suppress common-mode transients. Use Value: Symmetrical clamping ensures balanced suppression without skewing differential signaling; 12.0 V VC stays below RS-485 receiver absolute max rating (±12.5 V). |
Use Scenario: Adding secondary-level surge immunity to USB 2.0 D+/D− lines in smart home hubs after primary TVS array. IC Role / Device Role / Timing Role: Localized clamping element placed immediately before USB connector to intercept fast ESD events (IEC 61000-4-2 ±15 kV contact). Use Value: Sub-12 V clamping prevents damage to USB PHY transceivers rated for 3.6 V max supply, leveraging low capacitance (<100 pF) to avoid signal integrity degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0CA-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free; uses standard tin plating instead of halogen-free matte tin. | Approved for commercial-grade industrial use but not automotive AEC-Q101 qualified. | Select when halogen-free requirement is absent and cost optimization is prioritized over automotive compliance. |
| SMBJ7.0CA-M3 | Higher 600 W peak pulse power; larger SMB (DO-214AA) package; RθJA = 85 °C/W vs. 120 °C/W. | Better suited for higher-energy transients; requires more PCB area and offers improved thermal dissipation. | Choose when system-level surge testing exceeds 400 W or ambient temperature exceeds 85 °C with limited airflow. |
Compared with SMAJ7.0CA-M3/5A, the E3/5A variant trades halogen-free construction for lower cost in non-automotive settings, while the SMBJ7.0CA-M3 provides higher surge robustness at the expense of footprint and thermal resistance - enabling design flexibility across commercial, industrial, and automotive tiers.
Availability
SMAJ7.0CA-M3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line drivers, and consumer USB port protection requiring stable component supply and halogen-free compliance.
Supply support for SMAJ7.0CA-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, precision, and application-specific performance.
The SMAJ series was engineered for high-reliability transient suppression in space-constrained surface-mount designs, targeting automotive, industrial, and telecom applications demanding consistent clamping behavior and AEC-Q101 readiness.
FAQ
What does the "CA" suffix indicate in SMAJ7.0CA-M3/5A?
The "CA" suffix denotes a bidirectional configuration, meaning SMAJ7.0CA-M3/5A provides symmetrical transient voltage suppression in both polarities - unlike unidirectional "A" variants. This eliminates polarity marking on the SMA package and enables use in AC-coupled or floating circuits such as RS-485, CAN, or sensor bridges where voltage reversals occur.
Is SMAJ7.0CA-M3/5A AEC-Q101 qualified?
SMAJ7.0CA-M3/5A itself is not AEC-Q101 qualified; however, Vishay offers the HM3 suffix in combination with an "X" revision code (e.g., SMAJ7.0CAHM3_A/I) to denote halogen-free, RoHS-compliant, and AEC-Q101-qualified versions. The M3/5A variant is commercial-grade and intended for non-automotive applications unless explicitly ordered with HM3_X designation.
What is the maximum clamping voltage of SMAJ7.0CA-M3/5A and under what test condition?
The maximum clamping voltage of SMAJ7.0CA-M3/5A is 12.0 V, measured at a peak pulse current (IPPM) of 33.3 A using the standardized 10/1000 μs double-exponential waveform. This value reflects worst-case voltage seen by protected circuitry during a full-rated surge event and is guaranteed across the operating temperature range.
Can SMAJ7.0CA-M3/5A be used in place of a unidirectional TVS like SMAJ7.0A-M3/5A?
No - SMAJ7.0CA-M3/5A is bidirectional and lacks polarity marking, whereas SMAJ7.0A-M3/5A is unidirectional with a cathode band. Substituting them requires verifying circuit topology: SMAJ7.0CA-M3/5A works only where symmetrical clamping is needed (e.g., differential lines), while SMAJ7.0A-M3/5A is required for DC-biased rails where forward conduction must be blocked.
What PCB pad layout is recommended for optimal thermal and surge performance of SMAJ7.0CA-M3/5A?
Vishay specifies mounting SMAJ7.0CA-M3/5A on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve the rated 400 W peak pulse power and 120 °C/W junction-to-ambient thermal resistance. Reducing pad size or omitting thermal vias degrades both surge handling and steady-state power dissipation - especially critical in high-temperature industrial enclosures.
SMAJ7.0CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ7.0CA-M3/5A FAQ
1.How can I place an order for SMAJ7.0CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0CA-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 SMAJ7.0CA-M3/5A reliable?
The price and inventory of SMAJ7.0CA-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 SMAJ7.0CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.0CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0CA-M3/5A?
SMAJ7.0CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0CA-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 SMAJ7.0CA-M3/5A?
For technical support, including SMAJ7.0CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ7.0CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0CA-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 SMAJ7.0CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.0CA-M3/5A?
All SMAJ7.0CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0CA-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 SMAJ7.0CA-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.0CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.0CA-M3/5A Tags
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