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Vishay General Semiconductor - Diodes Division SMAJ14A-M3/5A
- Part No.:
- SMAJ14A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14A-M3/5A.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,484
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Product details
Overview
SMAJ14A-M3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 14 V standoff voltage (VWM), 15.6–17.2 V breakdown voltage (VBR) at 1 mA, 23.2 V clamping voltage (VC) at 17.2 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform). It is widely deployed to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supply rails.
For engineers reviewing the SMAJ14A-M3/5A datasheet, SMAJ14A-M3/5A pinout, SMAJ14A-M3/5A application, or SMAJ14A-M3/5A equivalent, key selection criteria include clamping performance under 17.2 A surge, thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification eligibility (via HM3 suffix), unidirectional polarity marking, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
The SMAJ14A-M3/5A operates as a silicon avalanche diode that enters controlled breakdown when reverse voltage exceeds its VBR range (15.6–17.2 V), limiting transient energy by clamping to ≤23.2 V at 17.2 A. Its glass-passivated junction ensures stable leakage (<1.0 μA at 14 V) and fast response time (<1.0 ps), critical for suppressing ESD and inductive switching spikes.
Thermally, it relies on PCB copper pad area for dissipation-rated at 3.3 W continuous power on infinite heatsink at 50 °C, with RθJL = 30 °C/W to leads. The M3 suffix confirms halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance and MSL Level 1 reflow profile (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working margin below clamping threshold. |
| VBR @ IT = 1 mA | 15.6–17.2 V - Breakdown onset range; ensures reliable triggering without premature leakage in 12 V rail protection. |
| VC @ IPPM = 17.2 A | 23.2 V - Clamped voltage during 10/1000 μs surge; limits downstream device stress to safe levels. |
| PPPM | 400 W - Peak pulse power handling (10/1000 μs); supports high-energy transients from relay coils or motor commutation. |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms half-sine); enables use in DC power input stages with occasional polarity reversal risk. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard footprint; requires adequate copper pour for sustained 3.3 W operation. |
| TJ Range | −55 to +150 °C - Full industrial/automotive temperature operation; validated for under-hood and factory-floor environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., 12 V rail); conducts surge current to ground during overvoltage events. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during reverse-biased surge. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against high-energy transients from inductive loads without derating below 78 V. |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free assembly without popcorn cracking or delamination. |
| AEC-Q101 qualification option (HM3 suffix) | Validates reliability for automotive applications including engine control modules and body electronics. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic interfaces. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 14 V. Use Value: Limits peak voltage to 23.2 V during 17.2 A transients, preventing damage to MCU power inputs and CAN transceivers. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) from ESD and field wiring faults. IC Role / Device Role / Timing Role: Bidirectional-capable layout (though SMAJ14A-M3/5A is unidirectional, used with series resistor for bidirectional effect) across signal and return. Use Value: Sub-1 ns response captures fast ESD events before op-amp input stages saturate or latch up. |
| Consumer Device DC Input Stage | MOSFET Gate Driver Transient Suppression |
Use Scenario: Safeguarding USB-C PD adapters and wall chargers against AC line surges coupled into secondary-side 12 V outputs. IC Role / Device Role / Timing Role: TVS mounted at output connector, shunting surge energy to common ground before reaching regulation ICs. Use Value: Withstands 400 W pulses without degradation, maintaining VWM stability over >100,000 surge events. | Use Scenario: Preventing gate oxide rupture in high-side N-channel MOSFETs driven by PWM controllers. IC Role / Device Role / Timing Role: Placed between gate and source to clamp Miller-induced voltage spikes during switching transitions. Use Value: Low clamping voltage (23.2 V) ensures gate-source voltage stays within ±20 V absolute maximum rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs M3). | No AEC-Q101 qualification path; limited to commercial-grade industrial use. | Select when halogen-free requirement is absent and cost sensitivity outweighs automotive compliance needs. |
| SMAJ14CA-M3/5A | Bidirectional version; symmetric VBR (15.6–17.2 V) in both polarities; same VC and PPPM. | Required for AC-coupled or floating signal lines where polarity reversal occurs (e.g., RS-485, audio jacks). | Choose only if bidirectional clamping is mandatory; otherwise unidirectional SMAJ14A-M3/5A offers tighter leakage control. |
Compared with SMAJ14A-E3/5A, the M3 variant adds halogen-free compliance without sacrificing surge capability; versus SMAJ14CA-M3/5A, the unidirectional configuration provides lower reverse leakage (<1.0 μA vs 2×ID for bidirectional), making it preferable for DC power rail protection where polarity is fixed.
Availability
SMAJ14A-M3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface guarding, and consumer DC adapter surge suppression requiring stable component supply across production lifecycles.
Supply support for SMAJ14A-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-reliability transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where compact size, repeatable clamping, and AEC-Q101 readiness are essential.
FAQ
What is the maximum clamping voltage of the SMAJ14A-M3/5A under a 10/1000 μs surge?
The SMAJ14A-M3/5A clamps to a maximum of 23.2 V when subjected to its rated peak pulse current of 17.2 A with a 10/1000 μs waveform. This value is guaranteed per the Vishay datasheet (Document Number: 88390, Rev. 09-Jan-2024) and reflects worst-case VC under standardized surge conditions. Designers must verify layout thermal performance to maintain this clamping behavior across temperature extremes.
Is the SMAJ14A-M3/5A suitable for automotive applications?
Yes-the SMAJ14A-M3/5A is halogen-free and RoHS-compliant, and the HM3 suffix variant (e.g., SMAJ14AHM3_A/I) is explicitly AEC-Q101 qualified. While SMAJ14A-M3/5A itself is commercial-grade, its construction and thermal specs align with automotive requirements; full qualification requires ordering the HM3-coded part. Always confirm qualification status via Vishay's official part numbering guide.
How does the M3 suffix differ from E3 in SMAJ14A-M3/5A?
The M3 suffix in SMAJ14A-M3/5A denotes halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance, whereas E3 indicates RoHS-compliance without halogen-free assurance. Both share identical electrical characteristics and packaging, but M3 is mandated for environmentally regulated markets (e.g., EU automotive supply chains) and offers enhanced long-term material stability under thermal stress.
What is the recommended PCB pad layout for optimal thermal performance of SMAJ14A-M3/5A?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal for SMAJ14A-M3/5A to achieve rated 400 W pulse power and 3.3 W continuous dissipation. Thermal vias under pads and internal copper planes further reduce RθJA; deviation from this layout risks exceeding TJ = 150 °C during repetitive surges or elevated ambient temperatures.
Can SMAJ14A-M3/5A be used in bidirectional signal protection?
No-SMAJ14A-M3/5A is strictly unidirectional, with cathode marked by a band. For bidirectional protection (e.g., data lines), the SMAJ14CA-M3/5A variant must be used. Attempting bidirectional use of SMAJ14A-M3/5A will result in forward conduction and potential failure during negative transients; always match device polarity to circuit topology.
SMAJ14A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 17.2A
- 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)
SMAJ14A-M3/5A FAQ
1.How can I place an order for SMAJ14A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14A-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 SMAJ14A-M3/5A reliable?
The price and inventory of SMAJ14A-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 SMAJ14A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ14A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14A-M3/5A?
SMAJ14A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14A-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 SMAJ14A-M3/5A?
For technical support, including SMAJ14A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14A-M3/5A requirements.
6.How does Aetrix verify that SMAJ14A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ14A-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 SMAJ14A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ14A-M3/5A?
All SMAJ14A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14A-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 SMAJ14A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ14A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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