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Vishay General Semiconductor - Diodes Division SMAJ7.0CA-E3/61
- Part No.:
- SMAJ7.0CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0CA-E3/61.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:12,107
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Product details
Overview
SMAJ7.0CA-E3/61 from Vishay General Semiconductor is a bidirectional 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, and clamps to ≤12.0 V at 33.3 A peak pulse current (IPPM) under 10/1000 μs waveform - used in automotive sensor protection, industrial I/O interfaces, and telecom line surge suppression.
For engineers reviewing the SMAJ7.0CA-E3/61 datasheet, SMAJ7.0CA-E3/61 pinout, SMAJ7.0CA-E3/61 application, or SMAJ7.0CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, 400 W peak pulse power rating, low clamping ratio (VC/VBR ≈ 1.5), AEC-Q101 qualification eligibility, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction enables fast response time (<1 ps), low incremental surge resistance, and stable clamping performance under repetitive 10/1000 μs transients at 0.01% duty cycle.
The device is rated for 400 W peak pulse power up to 78 V and derates to 300 W above that threshold. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting operation from –55 °C to +150 °C with no polarity marking required for bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - maximum continuous reverse stand-off voltage before significant leakage; defines safe operating window for protected circuit. |
| VBR min/max | 7.78 V / 8.60 V at 10 mA - guaranteed breakdown onset range; ensures reliable triggering during overvoltage events. |
| VC @ IPPM | 12.0 V at 33.3 A - clamped voltage under 10/1000 μs surge; determines worst-case stress on downstream ICs. |
| PPPM | 400 W - peak pulse power handling with 10/1000 μs waveform; supports robust protection against lightning-induced surges. |
| IPPM | 33.3 A - maximum non-repetitive surge current; defines physical current-handling limit before degradation. |
| TJ max | +150 °C - maximum junction temperature; enables use in under-hood automotive or high-ambient industrial environments. |
| RθJA | 120 °C/W - thermal resistance to ambient on standard PCB pad; informs heatsinking requirements for sustained surge duty. |
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. No polarity marking - bidirectional symmetry eliminates cathode/anode distinction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals behave identically; surge current flows bidirectionally without polarity dependency. |
| Case (body) | Thermal and mechanical interface | Non-electrical; provides mechanical anchoring and contributes to thermal dissipation via PCB copper pads. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) on properly laid out PCBs with 5 mm × 5 mm copper pads. |
| Low clamping voltage (12.0 V) | Provides margin below 13.5 V logic supply rails or 12 V automotive systems, preventing latch-up or damage to downstream MOSFETs or MCUs. |
| AEC-Q101 qualification option | HE3/HM3 suffix variants meet automotive reliability standards for engine control, body electronics, and ADAS sensor interfaces. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow at 260 °C peak without baking - simplifies manufacturing and reduces process risk. |
Applications
| Automotive Sensor Protection | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before it reaches signal conditioning circuitry. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 1/2a/5a events while enabling compact layout due to SMA footprint and no polarity constraints. | Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges from solenoid coils, relay contacts, or motor drives. IC Role / Device Role / Timing Role: Primary overvoltage limiter on 24 V DC input channels, coordinated with series impedance and filtering components. Use Value: Limits transient voltage to ≤12.0 V within 1 ps, preventing false triggering or latch-up in optocoupler or Schmitt-trigger input stages. |
| Telecom Line Interface | Consumer Power Adapter ESD/Surge |
Use Scenario: Protecting Ethernet PHYs, RS-485 transceivers, or DSL line drivers from lightning-induced surges on outdoor-facing ports. IC Role / Device Role / Timing Role: First-line transient suppressor in multi-stage protection architecture, absorbing bulk energy before secondary TVS or GDT stages. Use Value: Delivers 400 W surge handling with <12.0 V clamping, meeting ITU-T K.20/K.21 requirements for Class B equipment. | Use Scenario: Adding secondary surge immunity to USB-C or barrel-jack DC inputs in smart home hubs, set-top boxes, and IoT gateways. IC Role / Device Role / Timing Role: Clamp component placed after primary fuse and common-mode choke to handle differential-mode surges exceeding ESD diode limits. Use Value: Extends system-level surge withstand from ±8 kV (IEC 61000-4-2) to ±1 kV (IEC 61000-4-5) without increasing board area or cost significantly. |
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-E3/61 | Unidirectional variant; same VWM, VBR, and VC, but requires correct polarity orientation during placement. | Only suitable where circuit topology enforces defined polarity (e.g., DC power rail); not usable on AC or floating signals. | Select SMAJ7.0A-E3/61 only when polarity is fixed and board space allows explicit cathode marking. |
| SMBJ7.0CA-E3/52 | Same electrical specs but in larger SMB (DO-214AA) package; 600 W PPPM rating and lower RθJA (90 °C/W). | Better thermal performance and higher surge margin; occupies ~40% more PCB area and may not fit tight layouts. | Choose SMBJ7.0CA-E3/52 when surge repetition rate or ambient temperature exceeds SMAJ7.0CA-E3/61 limits. |
Compared with SMAJ7.0A-E3/61, the bidirectional SMAJ7.0CA-E3/61 eliminates polarity-dependent layout constraints, while SMBJ7.0CA-E3/52 trades footprint efficiency for enhanced thermal and surge robustness - making SMAJ7.0CA-E3/61 optimal for space-constrained, polarity-agnostic protection in automotive and industrial edge nodes.
Availability
SMAJ7.0CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O modules, telecom line protection, and consumer power adapter surge suppression requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ7.0CA-E3/61 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, power efficiency, and automotive-grade qualification.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting design-in across automotive, industrial automation, and communications infrastructure where robustness and AEC-Q101 readiness are critical.
FAQ
What is the clamping voltage of SMAJ7.0CA-E3/61 at its rated peak pulse current?
The SMAJ7.0CA-E3/61 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 guarantees worst-case voltage seen by protected circuitry during surge events - critical for ensuring compatibility with 12 V logic or automotive supply rails. The SMAJ7.0CA-E3/61 achieves this with a clamping ratio (VC/VBR) of approximately 1.5, indicating efficient energy diversion without excessive voltage overshoot.
Is SMAJ7.0CA-E3/61 suitable for automotive applications?
Yes, SMAJ7.0CA-E3/61 is suitable for automotive applications when ordered with HE3 or HM3 suffixes (e.g., SMAJ7.0CAHE3_A), which denote AEC-Q101 qualification. The base SMAJ7.0CA-E3/61 variant is commercial-grade but shares identical electrical and thermal specifications; its 150 °C junction rating, MSL Level 1 rating, and glass-passivated junction support under-hood and body-control module use. Always verify qualification status via the full ordering code - SMAJ7.0CA-E3/61 itself is RoHS-compliant but not automatically AEC-Q101 qualified.
How does SMAJ7.0CA-E3/61 differ from unidirectional SMAJ7.0A-E3/61?
SMAJ7.0CA-E3/61 is bidirectional with symmetrical clamping in both polarities and no cathode band marking, whereas SMAJ7.0A-E3/61 is unidirectional, requires correct polarity orientation (cathode marked), and conducts only in reverse bias. Both share identical VWM (7.0 V), VBR (7.78–8.60 V), and VC (12.0 V) specs. The SMAJ7.0CA-E3/61 eliminates layout errors from misoriented placement and supports AC-coupled or floating signal lines - making it preferred for CAN, RS-485, or sensor bridge applications where polarity isn't fixed.
What PCB layout guidance applies to SMAJ7.0CA-E3/61 for optimal surge performance?
For optimal surge performance, SMAJ7.0CA-E3/61 must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve its rated 400 W peak pulse power. Trace inductance must be minimized - place the device as close as possible to the protected port with short, wide traces. Avoid vias in the main surge path. Thermal relief should be avoided on pads to maximize heat spreading. The SMAJ7.0CA-E3/61's RθJA of 120 °C/W assumes this layout; deviation reduces surge endurance and increases junction temperature during repetitive events.
Does SMAJ7.0CA-E3/61 require external series impedance for effective protection?
Yes, SMAJ7.0CA-E3/61 requires external series impedance (e.g., resistor, ferrite bead, or PTC) between the protected line and the device to limit peak current and coordinate with downstream ICs. Without it, the low dynamic impedance of the SMAJ7.0CA-E3/61 can cause excessive current flow during clamping, potentially damaging the TVS or upstream components. Typical designs use 1–10 Ω resistors or 600 Ω–1 kΩ ferrites for signal lines, sized to ensure the protected IC sees <100 mA during clamping - verified using the SMAJ7.0CA-E3/61's VC = 12.0 V and system voltage.
SMAJ7.0CA-E3/61 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-E3/61 FAQ
1.How can I place an order for SMAJ7.0CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0CA-E3/61 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-E3/61 reliable?
The price and inventory of SMAJ7.0CA-E3/61 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-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ7.0CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0CA-E3/61?
SMAJ7.0CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0CA-E3/61 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-E3/61?
For technical support, including SMAJ7.0CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ7.0CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0CA-E3/61 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-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ7.0CA-E3/61?
All SMAJ7.0CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0CA-E3/61, 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-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ7.0CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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