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Vishay General Semiconductor - Diodes Division SMAJ7.0CA-M3/61
- Part No.:
- SMAJ7.0CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0CA-M3/61.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ7.0CA-M3/61 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 and 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 interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ7.0CA-M3/61 datasheet, SMAJ7.0CA-M3/61 pinout, SMAJ7.0CA-M3/61 application, or SMAJ7.0CA-M3/61 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.71), AEC-Q101 qualification eligibility (via HM3 suffix), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: during transient overvoltage events exceeding VWM, it avalanches symmetrically in both directions to limit voltage across protected circuit nodes. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while low incremental surge resistance enables effective energy diversion without thermal runaway under repetitive 0.01% duty cycle surges.
The device is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It meets UL 497B recognition (QVGQ2) and complies with JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow profile (peak 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 5 V–7 V signal/power rails. |
| VBR (min/max) | 7.78 V / 8.60 V at 10 mA - Confirmed avalanche onset range; ensures reliable triggering above VWM with tight tolerance (±5.4%). |
| VC @ IPPM | 12.0 V at 33.3 A - Clamped voltage during 10/1000 μs surge; limits stress on downstream 12 V-tolerant ICs and transceivers. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against inductive switch-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 2-pin surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with JEDEC MS-013. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity-unmarked for bidirectional operation; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive polarity event) | Conducts surge current into device during positive-going transients; forms symmetrical conduction path with cathode. |
| Cathode | Transient current entry (negative polarity event) | Conducts surge current into device during negative-going transients; enables identical clamping behavior in both directions. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, USB D+/D−) without polarity concerns. |
| 400 W peak pulse power (10/1000 μs) | Supports EN 61000-4-5 surge testing up to 1 kV open-circuit / 0.5 kV short-circuit with 2 Ω source impedance. |
| Low clamping ratio (VC/VWM = 1.71) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V and 5 V logic interfacing with legacy 12 V systems. |
| MSL Level 1, 260 °C reflow compatible | Eliminates pre-baking requirement and supports standard lead-free SMT assembly processes without moisture-induced damage. |
| AEC-Q101 qualification option (HM3 suffix) | Validates reliability for automotive applications including body electronics, infotainment, and ADAS sensor interfaces. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt-type transient clamp placed directly at connector interface to divert >100 V spikes before reaching ADC front-end. Use Value: Prevents latch-up or permanent damage to 12-bit SAR ADCs by limiting transient voltage to ≤12.0 V during 400 W surges. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers connected to 24 V DC field wiring subject to relay contact bounce and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional voltage limiter installed between terminal block and optocoupler input stage. Use Value: Maintains signal integrity under repeated 100 A/10 ms surges while enabling direct connection to unshielded industrial cabling. |
| USB 2.0 Data Line ESD Suppression | DC Power Rail Surge Protection |
|
Use Scenario: ESD and EOS protection for USB 2.0 D+ and D− lines in portable medical devices requiring IEC 61000-4-2 Level 4 compliance. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed adjacent to USB connector to clamp ±15 kV air discharge events. Use Value: Limits junction capacitance to <50 pF (typ.) at VWM, preserving signal rise/fall times and maintaining USB 2.0 eye diagram integrity. |
Use Scenario: Secondary-level surge suppression on 5 V or 12 V DC power distribution networks feeding microcontrollers and communication ICs. IC Role / Device Role / Timing Role: Standoff-rated shunt protector located after bulk filtering but before point-of-load regulators. Use Value: Absorbs 400 W transients without forward conduction, avoiding regulator shutdown or brownout during lightning-induced surges. |
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-M3/61 | Unidirectional version; same VWM, VBR, VC, and PPPM, but only conducts in reverse direction - requires correct polarity orientation. | Restricted to DC-biased lines where polarity is fixed (e.g., 5 V supply rail); unsuitable for AC or floating signals. | Select SMAJ7.0A-M3/61 only when protecting unidirectional power rails with known ground reference and no risk of reverse polarity events. |
| SMBJ7.0CA-M3/5A | Same electrical specs but in larger SMB (DO-214AA) package; 600 W PPPM rating; 1.5× higher thermal mass and 20 % lower RθJA. | Better suited for high-repetition-rate surges or elevated ambient temperatures (>85 °C); occupies more PCB area. | Choose SMBJ7.0CA-M3/5A when system-level surge testing exceeds 400 W or board layout allows larger footprint for improved thermal margin. |
Compared with SMAJ7.0CA-M3/61, the unidirectional SMAJ7.0A-M3/61 requires strict polarity alignment but offers identical clamping performance on DC rails, while the SMBJ7.0CA-M3/5A trades compact size for higher surge endurance and thermal resilience - making SMAJ7.0CA-M3/61 optimal for space-constrained bidirectional protection with balanced power/size requirements.
Availability
SMAJ7.0CA-M3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, USB data line protection, and DC power rail surge suppression requiring stable component supply, halogen-free RoHS compliance, and SMT-ready packaging.
Supply support for SMAJ7.0CA-M3/61 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, precision, and automotive-grade qualification.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, EFT, and surge events is mandatory.
FAQ
What is the clamping voltage of SMAJ7.0CA-M3/61 at its rated peak pulse current?
The SMAJ7.0CA-M3/61 has a maximum clamping voltage (VC) of 12.0 V when subjected to its rated peak pulse current (IPPM) of 33.3 A with a 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88390 and confirms the device's ability to limit transient overvoltages to a safe level for downstream 12 V-tolerant components. The SMAJ7.0CA-M3/61 maintains this clamping performance bidirectionally due to its symmetrical junction structure.
Is SMAJ7.0CA-M3/61 suitable for automotive applications?
Yes - the SMAJ7.0CA-M3/61 is halogen-free and RoHS-compliant, and its base part number SMAJ7.0CA-HM3_X (with revision suffix) is AEC-Q101 qualified. While the M3/61 variant itself is commercial-grade, it shares identical electrical and mechanical specifications with the qualified version and is widely deployed in automotive body electronics, sensor interfaces, and infotainment systems. Designers should specify HM3 suffix for production releases requiring formal qualification. The SMAJ7.0CA-M3/61 meets UL 497B and operates reliably from -55 °C to +150 °C.
How does SMAJ7.0CA-M3/61 differ from SMAJ7.0A-M3/61?
The SMAJ7.0CA-M3/61 is bidirectional, meaning it clamps voltage transients of either polarity symmetrically, while the SMAJ7.0A-M3/61 is unidirectional and only clamps in reverse bias - requiring correct cathode orientation relative to system ground. Both share identical VWM (7.0 V), VBR (7.78–8.60 V), VC (12.0 V), and PPPM (400 W) ratings. The SMAJ7.0CA-M3/61 is preferred for AC-coupled, floating, or polarity-agnostic signal lines such as RS-485 or USB; the SMAJ7.0A-M3/61 suits fixed-polarity DC rails like 5 V supply inputs.
What is the thermal resistance of SMAJ7.0CA-M3/61, and how does it affect PCB layout?
The SMAJ7.0CA-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W, measured on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under repetitive surges, PCB layout must provide minimum pad dimensions matching Vishay's recommended mounting footprint and avoid excessive trace length between the SMAJ7.0CA-M3/61 and protected node. Thermal vias under pads further reduce RθJA in high-power applications.
Does SMAJ7.0CA-M3/61 meet industry surge immunity standards?
Yes - the SMAJ7.0CA-M3/61 supports compliance with IEC 61000-4-5 (surge immunity), IEC 61000-4-2 (ESD), and IEC 61000-4-4 (EFT) when applied per Vishay's recommended layout and derating guidelines. Its 400 W peak pulse power rating aligns with Level 3 (1 kV/2 Ω) surge testing, and its sub-nanosecond response time ensures clamping occurs before sensitive ICs experience overstress. The SMAJ7.0CA-M3/61 is UL 497B recognized (QVGQ2), confirming suitability for telecommunications and industrial equipment safety certification.
SMAJ7.0CA-M3/61 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-M3/61 FAQ
1.How can I place an order for SMAJ7.0CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0CA-M3/61 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-M3/61 reliable?
The price and inventory of SMAJ7.0CA-M3/61 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-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ7.0CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0CA-M3/61?
SMAJ7.0CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0CA-M3/61 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-M3/61?
For technical support, including SMAJ7.0CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ7.0CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0CA-M3/61 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-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ7.0CA-M3/61?
All SMAJ7.0CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0CA-M3/61, 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-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ7.0CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.0CA-M3/61 Tags
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