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Vishay General Semiconductor - Diodes Division SMAJ7.0CA-E3/5A
- Part No.:
- SMAJ7.0CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0CA-E3/5A.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ7.0CA-E3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust ESD and surge protection on signal and power lines. It features a 7.0 V stand-off voltage (VWM), 7.78–8.60 V breakdown voltage (VBR) at 10 mA, clamps transients to ≤12.0 V at 33.3 A peak pulse current (IPPM), and delivers 400 W peak pulse power (10/1000 μs waveform) in the SMA (DO-214AC) package - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ7.0CA-E3/5A datasheet, SMAJ7.0CA-E3/5A pinout, SMAJ7.0CA-E3/5A application, or SMAJ7.0CA-E3/5A equivalent, key selection criteria include bidirectional clamping behavior, 12.0 V max clamping voltage at rated surge current, AEC-Q101 qualification eligibility (via HE3/HM3 variants), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its CA suffix designation, enabling protection of AC-coupled or differential signal paths without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<10 μA at 7.0 V), while the 120 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design for sustained surge handling.
The device complies with ANSI/IEEE C62.35 for surge suppression and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. It is rated for -55 °C to +150 °C operating junction temperature and supports repetitive surges at 0.01% duty cycle - critical for automotive load-dump and inductive-switching transient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 7.0 V - Maximum continuous reverse voltage before significant conduction; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 7.78–8.60 V at 10 mA - Confirmed minimum/maximum avalanche onset range; ensures predictable turn-on during transients |
| VC (Clamping Voltage) | ≤12.0 V at IPPM = 33.3 A - Peak voltage seen by protected circuit during 10/1000 μs surge; limits stress on downstream ICs |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Energy-handling capability under standardized surge waveform; derates to 300 W above 78 V |
| ID (Reverse Leakage) | ≤10 μA at 7.0 V - Low off-state current minimizes power loss and signal distortion in high-impedance circuits |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; optimized for pick-and-place |
| TJ max | +150 °C - Maximum junction temperature rating; enables operation in under-hood automotive and industrial ambient conditions |
Pinout & Package
Package: SMA (DO-214AC) - molded plastic case with matte tin-plated leads, UL 94 V-0 rated, compliant with J-STD-002 solderability and JESD 22-B102 whisker testing. Bidirectional construction means no polarity marking; both terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Identical bidirectional terminals - either terminal may connect to line or ground; no cathode band marking |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating signal lines without polarity constraints or external diode pairing |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) when mounted on 5.0 mm × 5.0 mm copper pads |
| Fast response time | Sub-nanosecond avalanche turn-on ensures protection before sensitive ICs experience overvoltage damage |
| AEC-Q101 qualification path | HE3/HM3 variants available - supports automotive-grade reliability requirements for engine control, ADAS sensors, and body electronics |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a), improving clamping precision |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching noise in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and chassis ground to clamp ±100 V transients within 1 ns. Use Value: Prevents latch-up or gate oxide damage in microcontroller input buffers by limiting voltage to ≤12.0 V during 33.3 A surge events. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V DC field devices subject to relay contact bounce and motor switching spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS shunting surge energy away from optocoupler inputs and level-shifting circuitry. Use Value: Maintains signal integrity by holding line voltage below 12.0 V during 400 W transient events, avoiding false triggering or component degradation. |
| Consumer USB Data Line Protection | Telecom Ethernet PHY Interface |
Use Scenario: ESD protection for USB 2.0 D+/D- lines in portable devices exposed to ±15 kV air discharge per IEC 61000-4-2. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor placed inline with data pairs to divert ESD without signal distortion. Use Value: Achieves <10 μA leakage at 7.0 V, preserving signal rise/fall times while surviving >1000 ESD strikes without parameter shift. |
Use Scenario: Secondary surge protection on 10/100BASE-TX Ethernet PHY side, downstream of primary gas discharge tube or MOV. IC Role / Device Role / Timing Role: Fast-clamping TVS limiting residual surge to ≤12.0 V before reaching magnetics and PHY transceiver pins. Use Value: Complements upstream protection by handling fast-rising edge components (tR < 1 ns) that bypass slower primary protectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0A-E3/5A | Unidirectional variant with cathode band marking; identical VWM, VBR, VC, and PPPM ratings | Requires correct polarity orientation; unsuitable for AC or floating lines without series diode pairing | Select when protecting DC-biased lines where polarity is fixed and lower cost is prioritized |
| SMBJ7.0CA-E3/52 | Same electrical specs but in larger SMB (DO-214AA) package; 100 W higher PPPM (500 W) and lower RθJA (80 °C/W) | Better thermal performance for high-duty-cycle surges; requires larger PCB footprint (4.58 mm × 3.94 mm vs. 4.50 mm × 2.29 mm) | Select when board space allows and enhanced surge endurance or thermal margin is required |
Compared with SMAJ7.0CA-E3/5A, the unidirectional SMAJ7.0A-E3/5A demands strict polarity alignment but offers identical clamping performance, while the SMBJ7.0CA-E3/52 provides superior thermal dissipation and surge headroom at the cost of increased footprint - making each suitable for distinct layout and reliability trade-offs.
Availability
SMAJ7.0CA-E3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, consumer USB data line hardening, and telecom Ethernet PHY interface designs requiring stable component supply across production lifecycles.
Supply support for SMAJ7.0CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, lightning-induced surges, and inductive switching events is mission-critical.
FAQ
What does the "CA" suffix indicate in SMAJ7.0CA-E3/5A?
The "CA" suffix denotes a bidirectional configuration, meaning SMAJ7.0CA-E3/5A conducts identically in both forward and reverse directions - unlike unidirectional variants (e.g., SMAJ7.0A-E3/5A) that require cathode alignment. This makes SMAJ7.0CA-E3/5A ideal for protecting AC-coupled signals, differential buses, or floating nodes where polarity is undefined or alternates.
What is the maximum clamping voltage of SMAJ7.0CA-E3/5A under surge conditions?
The maximum clamping voltage (VC) of SMAJ7.0CA-E3/5A is 12.0 V when subjected to its rated peak pulse current of 33.3 A using the standard 10/1000 μs waveform. This value is measured at the device terminals and represents the highest voltage imposed on the protected circuit during a full-power transient event - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ7.0CA-E3/5A qualified for automotive applications?
SMAJ7.0CA-E3/5A itself is commercial-grade (E3 suffix), but Vishay offers AEC-Q101-qualified versions under ordering codes SMAJ7.0CAHE3_X (RoHS-compliant, automotive) and SMAJ7.0CAHM3_X (halogen-free, RoHS-compliant, automotive). These variants undergo extended stress testing for temperature cycling, humidity, and mechanical shock - making them suitable for under-hood and safety-critical automotive subsystems.
How does the SMA (DO-214AC) package of SMAJ7.0CA-E3/5A affect thermal performance?
The SMA (DO-214AC) package of SMAJ7.0CA-E3/5A 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. This necessitates adequate PCB copper area for reliable 400 W surge handling; insufficient copper increases junction temperature and risks parametric shift or failure during repetitive events.
Can SMAJ7.0CA-E3/5A be used in place of SMAJ7.0A-E3/5A without circuit modification?
No - SMAJ7.0CA-E3/5A is bidirectional and lacks polarity marking, whereas SMAJ7.0A-E3/5A is unidirectional with a cathode band. Substituting SMAJ7.0CA-E3/5A for SMAJ7.0A-E3/5A in a DC-biased circuit may cause unintended conduction if reverse voltage exceeds VWM. The reverse substitution is also invalid due to polarity dependency. Always verify circuit topology and transient directionality before interchange.
SMAJ7.0CA-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:
- -
- 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-E3/5A FAQ
1.How can I place an order for SMAJ7.0CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0CA-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 SMAJ7.0CA-E3/5A reliable?
The price and inventory of SMAJ7.0CA-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 SMAJ7.0CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.0CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0CA-E3/5A?
SMAJ7.0CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0CA-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 SMAJ7.0CA-E3/5A?
For technical support, including SMAJ7.0CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ7.0CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0CA-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 SMAJ7.0CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.0CA-E3/5A?
All SMAJ7.0CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0CA-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 SMAJ7.0CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.0CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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