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Vishay General Semiconductor - Diodes Division SMAJ14CA-M3/5A
- Part No.:
- SMAJ14CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14CA-M3/5A.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,995
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Product details
Overview
SMAJ14CA-M3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for clamping voltage transients on signal and power lines. It features a 14 V standoff voltage (VWM), 23.2 V maximum clamping voltage (VC) at 17.2 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 SMAJ14CA-M3/5A datasheet, SMAJ14CA-M3/5A pinout, SMAJ14CA-M3/5A application, or SMAJ14CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, SMA (DO-214AC) package compatibility, AEC-Q101 qualification status, and thermal resistance (RθJA = 120 °C/W) for board-level surge protection design.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while the 150 °C maximum junction temperature supports operation in under-hood automotive environments.
The device responds within picoseconds to transient events and maintains low incremental surge resistance to minimize voltage overshoot during ESD or load-switching surges. It meets MSL Level 1 per J-STD-020 and is halogen-free and RoHS-compliant (M3 suffix), with matte tin-plated leads solderable per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 15.6 V / 17.2 V at 1.0 mA - Confirmed breakdown threshold range for reliable turn-on margin |
| VC @ IPPM | 23.2 V at 17.2 A - Clamped voltage during 400 W transient, defining worst-case stress on protected circuit |
| PPPM | 400 W (10/1000 μs) - Peak surge energy handling capacity for standard lightning/inductive switching transients |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms), relevant for unidirectional variants only; not applicable here |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads, guiding PCB layout cooling needs |
| TJ max | +150 °C - Maximum junction temperature, supporting under-hood and industrial ambient conditions |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (one direction) | One terminal of symmetrical PN junction; conducts during positive transients relative to cathode reference |
| Cathode | Transient current entry (opposite direction) | Second terminal of symmetrical junction; conducts during negative transients - functionally identical to anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating signal lines without polarity constraints |
| 400 W peak pulse power | Handles IEC 61000-4-5 surge test levels up to 4 kV (line-to-earth) with appropriate impedance matching |
| Low clamping ratio (VC/VBR ≈ 1.43) | Minimizes overvoltage stress on downstream components during fast transients |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow at 260 °C peak, simplifying SMT manufacturing |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for automotive and industrial end equipment |
Applications
| Automotive Body Control Module | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus and switch inputs in door modules against load dump and ESD. IC Role / Device Role / Timing Role: Bidirectional TVS clamping transient energy before it reaches microcontroller GPIO or transceiver inputs. Use Value: Prevents latch-up or permanent damage to 5 V logic circuits exposed to ±25 kV contact ESD per IEC 61000-4-2. | Use Scenario: Safeguarding analog outputs (4–20 mA) and digital I/O of pressure/temperature sensors in factory automation. IC Role / Device Role / Timing Role: Fast-response voltage clamp absorbing inductive kickback from solenoid drivers sharing same PCB ground plane. Use Value: Maintains signal integrity by limiting transient overshoot to <23.2 V, well below 30 V absolute maximum ratings of common op-amps and ADCs. |
| Consumer Power Adapter Input Stage | Telecom Ethernet PHY Protection |
Use Scenario: Secondary-side transient suppression on DC output rails of wall adapters subject to capacitive coupling noise. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 μA) bidirectional clamp preventing false triggering of overvoltage protection circuits. Use Value: Ensures stable 12 V rail operation during conducted EFT bursts (IEC 61000-4-4) without affecting regulation loop stability. | Use Scenario: Common-mode surge protection on RJ45 magnetics secondary side in PoE-powered network switches. IC Role / Device Role / Timing Role: Symmetrical clamping across differential pairs to suppress longitudinal surges without distorting signal timing. Use Value: Limits common-mode voltage excursion to ≤23.2 V, preserving Ethernet signal integrity and avoiding PHY reset during 1 kV surge tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A-M3/5A | Unidirectional variant; includes cathode band marking and forward voltage drop (VF = 3.5 V @ 25 A) | Requires correct polarity placement; unsuitable for AC or floating nodes | Select only when protecting DC-biased lines with known polarity and need for forward conduction capability |
| SMBJ14CA-M3/5A | Same VWM/VC, but SMB (DO-214AA) package - 2.5 mm wider body and higher PPPM (600 W) | Requires larger PCB footprint; better suited for higher-energy surge environments | Choose when system-level surge testing exceeds 400 W or board space allows larger package |
Compared with SMAJ14CA-M3/5A, the unidirectional SMAJ14A-M3/5A demands strict polarity alignment but offers forward conduction, while SMBJ14CA-M3/5A delivers higher surge robustness in a physically larger package - both require layout review and are not drop-in replacements.
Availability
SMAJ14CA-M3/5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer power adapter designs, and telecom PHY protection requiring stable component supply and halogen-free compliance.
Supply support for SMAJ14CA-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 and automotive-grade qualification.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against ESD, EFT, and lightning-induced surges is critical.
FAQ
What does the "CA" suffix indicate in SMAJ14CA-M3/5A?
The "CA" suffix denotes a bidirectional configuration - meaning SMAJ14CA-M3/5A provides symmetrical clamping in both polarities, with no cathode marking required. This distinguishes it from unidirectional "A" variants like SMAJ14A-M3/5A, which have a defined cathode band and conduct only in reverse bias. The CA version is ideal for AC-coupled or floating signal lines where polarity is undefined.
Is SMAJ14CA-M3/5A qualified to AEC-Q101?
No - SMAJ14CA-M3/5A is halogen-free and RoHS-compliant (M3 grade) but not AEC-Q101 qualified. For automotive applications requiring AEC-Q101, the equivalent part is SMAJ14CAHM3_A/I (with HM3 suffix and revision code), which carries the same electrical specs but adds stress-test validation for automotive use. Always verify qualification status via Vishay's official ordering codes before automotive deployment.
What is the maximum clamping voltage of SMAJ14CA-M3/5A and how is it measured?
The maximum clamping voltage (VC) of SMAJ14CA-M3/5A is 23.2 V, measured at 17.2 A peak pulse current using the standardized 10/1000 μs double-exponential waveform. This value represents the worst-case voltage seen by downstream circuitry during a surge event and is guaranteed across temperature and production lot variations per Vishay's datasheet specification on page 2.
Can SMAJ14CA-M3/5A be used in place of SMAJ14A-M3/5A?
No - SMAJ14CA-M3/5A cannot directly replace SMAJ14A-M3/5A without circuit review. While both share VWM = 14 V and similar VC, SMAJ14A-M3/5A is unidirectional and conducts forward current (VF = 3.5 V @ 25 A), whereas SMAJ14CA-M3/5A is bidirectional with no forward conduction path. Substitution may cause malfunction in DC-biased circuits relying on forward voltage drop for sensing or regulation.
What PCB pad layout is recommended for optimal thermal performance of SMAJ14CA-M3/5A?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad for each terminal of SMAJ14CA-M3/5A to achieve the rated 400 W peak pulse power and RθJA = 120 °C/W. Smaller pads reduce surge capability and increase junction temperature - derating curves in Figure 2 show >20% power loss at 0.1" pads. Thermal vias under pads further improve heat dissipation in high-reliability designs.
SMAJ14CA-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):
- 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)
SMAJ14CA-M3/5A FAQ
1.How can I place an order for SMAJ14CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14CA-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 SMAJ14CA-M3/5A reliable?
The price and inventory of SMAJ14CA-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 SMAJ14CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ14CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14CA-M3/5A?
SMAJ14CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14CA-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 SMAJ14CA-M3/5A?
For technical support, including SMAJ14CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ14CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ14CA-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 SMAJ14CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ14CA-M3/5A?
All SMAJ14CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14CA-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 SMAJ14CA-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ14CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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