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Vishay General Semiconductor - Diodes Division SMAJ14-E3/5A
- Part No.:
- SMAJ14-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14-E3/5A.pdf
- Description:
- TVS DIODE 14VWM 25.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,909
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Product details
Overview
SMAJ14-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping transient overvoltages on power and signal lines. It features a 14 V stand-off voltage (VWM), 25.8 V maximum clamping voltage (VC) at 15.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ14-E3/5A datasheet, SMAJ14-E3/5A pinout, SMAJ14-E3/5A application, or SMAJ14-E3/5A equivalent, key selection criteria include unidirectional polarity, 150 °C max junction temperature, RoHS-compliant matte tin plating, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device using an avalanche breakdown mechanism. Its unidirectional configuration provides forward conduction only during reverse-transient events, with cathode band marking for polarity identification and no inherent DC blocking function in forward bias.
It delivers 400 W peak pulse power (derated to 300 W above 78 V) under 10/1000 µs surge conditions, with low incremental surge resistance and fast response time (<1 ns). Thermal performance is defined by RθJA = 120 °C/W and RθJL = 30 °C/W when mounted on 0.2 × 0.2" copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 14 V - Maximum continuous reverse working voltage before clamping initiates |
| Clamping Voltage (VC) | 25.8 V at 15.5 A - Peak voltage seen across protected circuit during 10/1000 µs surge |
| Peak Pulse Power (PPPM) | 400 W - Surge energy handling capability with 10/1000 µs waveform at TA = 25 °C |
| Breakdown Voltage (VBR) | 15.6–19.1 V at 1 mA - Confirmed avalanche onset range ensuring reliable triggering margin |
| Reverse Leakage (ID) | 1.0 µA max at 14 V - Negligible standby current enabling low-power system compatibility |
| Junction Temperature Range | −55 °C to +150 °C - Supports operation in harsh industrial and automotive under-hood environments |
| Package | DO-214AC (SMA) - Standard surface-mount outline with 0.208" body length and cathode band marking |
Pinout & Package
DO-214AC (SMA) package: surface-mount, single-axis molded case with cathode band indicating terminal polarity; terminals are matte tin-plated leads solderable per J-STD-002 and JESD22-B102; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance reference in unidirectional clamp configuration |
| Cathode (marked) | Transient voltage sensing and clamping node | Connected to protected line; avalanche conduction begins when line exceeds VWM |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable avalanche characteristics and long-term reliability under repeated surge stress |
| MSL Level 1 rating | Enables direct placement without baking; compatible with standard reflow profiles up to 260 °C peak |
| 400 W peak pulse power (10/1000 µs) | Provides robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V systems |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for downstream ICs |
| RoHS-compliant & JESD201 Class 1A whisker tested | Meets commercial-grade environmental and reliability requirements for high-volume industrial production |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O lines against inductive kickback from relay and solenoid switching. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between MCU GPIO and external load interface. Use Value: Limits transient voltage to ≤25.8 V during 15.5 A surges, preventing latch-up or oxide damage in 3.3 V/5 V logic circuits. |
Use Scenario: Safeguarding LIN bus transceivers and sensor inputs from battery dump and load-dump events. IC Role / Device Role / Timing Role: Standoff-clamp protector on 12 V supply rail feeding CAN/LIN interface ICs. Use Value: Withstands 400 W pulses while maintaining <1 µA leakage at 14 V, preserving sleep-mode current budgets. |
| Consumer Power Adapters | Telecom PoE Injectors |
Use Scenario: Secondary-side overvoltage suppression on 5 V/9 V/12 V DC outputs of AC-DC adapters. IC Role / Device Role / Timing Role: Fast-response shunt clamp parallel to output capacitor and regulator feedback network. Use Value: Clamps 10/1000 µs surges to 25.8 V before downstream USB port controllers experience overvoltage stress. |
Use Scenario: Input-side transient suppression on 48 V PoE power feed before DC-DC conversion stage. IC Role / Device Role / Timing Role: Primary-line TVS on PSE side, rated for repetitive 10/1000 µs surges per IEEE 802.3af/at. Use Value: Handles 400 W peak power with 150 °C junction rating, supporting continuous operation in sealed PoE enclosure environments. |
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-E3/5A | Lower VBR range (15.6–17.2 V), tighter tolerance; clamps at 23.2 V @ 17.2 A | Better suited for precision 12 V rail protection where lower clamping voltage is critical | Select SMAJ14A-E3/5A when design requires <24 V clamping threshold with same footprint |
| SMBJ14A-E3/52 | DO-214AA (SMB) package; higher PPPM = 600 W; same VWM/VC specs | Used where higher surge margin is needed but board space allows larger SMB outline | Choose SMBJ14A-E3/52 if system-level testing shows 400 W insufficient for worst-case lightning-induced surges |
Compared with SMAJ14-E3/5A, SMAJ14A-E3/5A offers tighter breakdown control and lower clamping voltage for improved protection margin, while SMBJ14A-E3/52 provides 50 % higher surge power in a physically larger package - both require layout review due to non-pin-compatible footprints.
Availability
SMAJ14-E3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and consumer power adapters requiring stable component supply with full traceability and volume scalability.
Supply support for SMAJ14-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, rectifiers, MOSFETs, and protection devices with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for robust transient suppression in space-constrained surface-mount applications, targeting industrial, automotive, and telecom systems where high-energy surge immunity and automated assembly compatibility are essential.
FAQ
What is the maximum clamping voltage of the SMAJ14-E3/5A under standard test conditions?
The SMAJ14-E3/5A has a maximum clamping voltage (VC) of 25.8 V when subjected to its rated peak pulse current of 15.5 A with a 10/1000 µs waveform. This value is measured at TA = 25 °C on specified 0.2 × 0.2" copper pads and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ14-E3/5A maintains this clamping performance across its full operating temperature range.
Is the SMAJ14-E3/5A suitable for bidirectional transient protection?
No, the SMAJ14-E3/5A is a unidirectional TVS diode, indicated by its part number suffix absence of "C" or "CA". It conducts only in reverse bias during overvoltage events and blocks forward current like a standard diode. For bidirectional protection, Vishay specifies variants such as SMAJ14CA-E3/5A. Using SMAJ14-E3/5A in AC-coupled or symmetrical signal lines would result in unintended forward conduction and potential failure.
What does the "E3/5A" suffix indicate in SMAJ14-E3/5A?
The "E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting JESD201 Class 1A whisker resistance. The "/5A" specifies packaging in 13-inch diameter plastic tape and reel containing 7500 units - distinct from "/61" (7-inch reel, 1800 units). Both formats use the same die and electrical specifications; the suffix solely identifies compliance level and logistics configuration for SMAJ14-E3/5A.
How does the thermal resistance of SMAJ14-E3/5A affect PCB layout?
The SMAJ14-E3/5A has RθJA = 120 °C/W and RθJL = 30 °C/W, meaning effective heat dissipation depends critically on copper pad area and via count. To maintain TJ ≤ 150 °C during repetitive surges, Vishay specifies minimum 0.2 × 0.2" (5.0 × 5.0 mm) copper pads per terminal. Reducing pad size or omitting thermal vias will raise junction temperature and degrade surge endurance for SMAJ14-E3/5A.
Can SMAJ14-E3/5A be used in automotive applications requiring AEC-Q101 qualification?
No, SMAJ14-E3/5A is commercial-grade (base P/N-E3). For AEC-Q101 qualified automotive use, Vishay offers the SMAJ14HE3/5A variant, which carries the "HE3" suffix and undergoes additional stress testing per the AEC standard. Substituting SMAJ14-E3/5A in automotive designs risks non-compliance with functional safety requirements and may void warranty - SMAJ14HE3/5A is the validated alternative for under-hood and chassis applications.
SMAJ14-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 25.8V
- Current - Peak Pulse (10/1000µs):
- 15.5A
- 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)
SMAJ14-E3/5A FAQ
1.How can I place an order for SMAJ14-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14-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 SMAJ14-E3/5A reliable?
The price and inventory of SMAJ14-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 SMAJ14-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ14-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14-E3/5A?
SMAJ14-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14-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 SMAJ14-E3/5A?
For technical support, including SMAJ14-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14-E3/5A requirements.
6.How does Aetrix verify that SMAJ14-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ14-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 SMAJ14-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ14-E3/5A?
All SMAJ14-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14-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 SMAJ14-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ14-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ14-E3/5A Tags
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