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Alpha & Omega Semiconductor Inc. SMDJ14A
- Part No.:
- SMDJ14A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ14A.pdf
- Description:
- 1CH 14V UNIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:9,351
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Product details
Overview
SMDJ14A from Alpha & Omega Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 14.0 V reverse stand-off voltage (VRWM), 15.6–17.2 V breakdown voltage (VBR) at 1 mA, 23.2 V maximum clamping voltage (VC) at 129.4 A peak pulse current, and 3000 W peak pulse power rating on 10/1000 µs waveform.
For engineers reviewing the SMDJ14A datasheet, pinout, applications, or equivalent options, key selection considerations include clamping performance under IEC 61000-4-5 surge conditions, thermal resistance (RθJA = 75 °C/W), unidirectional polarity with cathode band marking, and DO-214AB package compatibility with automated SMT assembly.
Technical Context
The SMDJ14A operates as a silicon avalanche diode that enters controlled breakdown above its VRWM to shunt transient energy away from protected circuitry. Its glass-passivated junction ensures stable VBR tolerance and low leakage (≤2.0 µA @ 14.0 V), while the low-profile DO-214AB package supports high-current handling via optimized thermal path to PCB copper pads.
Designed for single-pulse, non-repetitive surges up to 3000 W (10/1000 µs), it delivers sub-1 ps response time from 0 V to VBR and meets J-STD-020 MSL Level 1 reflow requirements (260 °C peak). Its 15 °C/W junction-to-lead thermal resistance enables effective heat dissipation when mounted on 8.0 mm × 8.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 14.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 mA | 15.6–17.2 V - Confirmed avalanche onset range; ensures reliable turn-on margin above VRWM |
| VC @ IPPM | 23.2 V - Clamped voltage at 129.4 A peak pulse; defines worst-case voltage seen by downstream ICs |
| PPPM (10/1000 µs) | 3000 W - Surge energy handling capacity; supports IEC 61000-4-5 Level 4 (4 kV) protection |
| RθJA | 75 °C/W - Thermal resistance to ambient; requires minimum 8 mm × 8 mm copper pad per lead for rated derating |
| IR @ VRWM | ≤2.0 µA - Low leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max | +150 °C - Maximum junction temperature; enables operation in industrial and automotive under-hood environments |
Pinout & Package
DO-214AB (SMC J-Bend) package: molded plastic case with matte tin lead-free plating, JEDEC-compliant outline, cathode indicated by color band. Designed for surface mounting with strain relief and optimized thermal conduction to PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to protected line (e.g., +12 V rail); not used in normal TVS operation |
| Cathode | Current exit point during reverse breakdown | Marked with color band; tied to ground or low-impedance return path to divert surge current |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps from 0 V to VBR - Enables protection of high-speed digital interfaces against ESD and fast transients |
| Glass passivated junction | Stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| Low profile DO-214AB | Height ≤2.6 mm - Supports compact board layouts and low-clearance mechanical enclosures |
| MSL Level 1 compliance | Reflow capable up to 260 °C peak - Eliminates moisture sensitivity concerns in standard SMT processes |
| UL 94V-0 flammability | Self-extinguishing plastic housing - Meets safety standards for industrial and consumer end equipment |
Applications
| Automotive Power Line Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp transients exceeding 14 V. Use Value: Withstands 3000 W surges and clamps to 23.2 V, ensuring downstream regulators and microcontrollers remain within absolute maximum ratings. | Use Scenario: Shielding 24 V digital input modules from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Primary surge suppression device on dry-contact inputs, coordinated with series impedance. Use Value: 129.4 A peak pulse current capability handles repetitive switching transients without degradation, supporting >100,000 cycle lifetime. |
| Telecom DC Power Feeds | Medical Equipment Power Entry |
Use Scenario: Safeguarding PoE-powered devices (e.g., IP cameras) against lightning-induced surges on 48 V DC lines. IC Role / Device Role / Timing Role: First-stage clamping element upstream of DC-DC converters and Ethernet PHYs. Use Value: 23.2 V clamping voltage prevents overvoltage damage to 48 V tolerant front-end circuitry while maintaining low leakage (<2 µA) during normal operation. | Use Scenario: Protecting auxiliary 12 V/24 V internal power rails in diagnostic imaging systems from ESD and cable discharge events. IC Role / Device Role / Timing Role: Secondary-level TVS on isolated power domains requiring low capacitance and high reliability. Use Value: Glass-passivated junction and UL 94V-0 housing meet IEC 60601-1 insulation and flammability requirements for Class II medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC14 | Lower PPPM (1500 W), higher VC (25.0 V @ 100 A), same DO-214AB package | Rated for lower-energy surges; suitable where IEC 61000-4-5 Level 3 suffices | Select SAC14 only if system-level testing confirms 25.0 V clamping is acceptable for protected ICs |
| 1.5SMC14A | Same VRWM/VBR/VC specs, but RθJA = 85 °C/W and no MSL Level 1 guarantee | Requires larger copper area or forced cooling for full 3000 W rating; less robust for high-volume SMT | Prefer SMDJ14A for automated manufacturing and thermal-critical designs; use 1.5SMC14A only for legacy footprint reuse |
Compared with SAC14 and 1.5SMC14A, the SMDJ14A delivers superior thermal performance (RθJA = 75 °C/W), guaranteed MSL Level 1 reflow compatibility, and tighter VBR tolerance-making it optimal for high-reliability industrial and automotive surge protection where consistent clamping and process robustness are mandatory.
Availability
SMDJ14A is available at Aetrix Electronics and suitable for automotive power line protection, industrial PLC I/O protection, and telecom DC power feeds requiring stable component supply, RoHS-compliant packaging, and traceable sourcing.
Supply support for SMDJ14A 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
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in MOSFETs, TVS diodes, and power ICs for efficiency-critical applications.
The SMDJ series is part of AOS' high-power TVS portfolio engineered specifically for robust, surface-mount surge protection in automotive, industrial, and telecom infrastructure-emphasizing low clamping voltage, fast response, and process reliability.
FAQ
What is the maximum clamping voltage of the SMDJ14A under a 10/1000 µs surge?
The SMDJ14A has a maximum clamping voltage (VC) of 23.2 V when subjected to its rated peak pulse current of 129.4 A on a 10/1000 µs waveform. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMDJ14A maintains this clamping performance across its specified operating temperature range.
Is the SMDJ14A unidirectional or bidirectional, and how is polarity identified?
The SMDJ14A is a unidirectional TVS diode, with polarity indicated by a cathode band on the DO-214AB package body. This band marks the cathode terminal, which must be connected to the reference ground or low-impedance return path. Bidirectional variants (e.g., SMDJ14CA) exist but are distinct part numbers; the SMDJ14A itself conducts only in reverse breakdown mode.
What is the thermal resistance and recommended PCB layout for the SMDJ14A?
The SMDJ14A has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To achieve rated power dissipation, designers must implement these minimum pad dimensions and ensure adequate copper area for heat spreading. The SMDJ14A's RθJL of 15 °C/W further supports efficient conduction to the PCB leads.
Does the SMDJ14A meet lead-free and RoHS compliance requirements?
Yes, the SMDJ14A is a Green Product per AOS policy: it is lead-free, RoHS compliant, and halogen-free. Its matte tin lead finish meets J-STD-020 MSL Level 1 reflow specifications (peak 260 °C), and the package carries UL 94V-0 flammability rating-ensuring compliance with global environmental and safety directives.
What is the reverse leakage current specification for the SMDJ14A at its rated VRWM?
The SMDJ14A exhibits a maximum reverse leakage current (IR) of 2.0 µA when biased at its reverse stand-off voltage (VRWM) of 14.0 V and tested at 25 °C. This low leakage ensures minimal power loss in standby operation and preserves signal integrity in high-impedance sensing or bias networks where the SMDJ14A may be deployed.
SMDJ14A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- 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):
- 129.4A
- Power - Peak Pulse:
- 3000W (3kW)
- 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-214AB
SMDJ14A FAQ
1.How can I place an order for SMDJ14A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ14A 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 SMDJ14A reliable?
The price and inventory of SMDJ14A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ14A is usually 5 days.
3.What payment methods are accepted for SMDJ14A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ14A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ14A?
SMDJ14A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ14A 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 SMDJ14A?
For technical support, including SMDJ14A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ14A requirements.
6.How does Aetrix verify that SMDJ14A is sourced from the original manufacturer or authorized distributors?
All SMDJ14A 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 SMDJ14A meets industry standards.
7.What is the process for return or replacement of SMDJ14A?
All SMDJ14A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ14A, 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 SMDJ14A part is unused and in its original packaging.
Return procedure for SMDJ14A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ14A Tags
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