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Alpha & Omega Semiconductor Inc. SMDJ15A
- Part No.:
- SMDJ15A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ15A.pdf
- Description:
- 1CH 15V UNIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:3,164
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Product details
Overview
SMDJ15A 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 15.0 V reverse stand-off voltage (VRWM), 16.7–18.5 V breakdown voltage (VBR) at 1 mA, 24.4 V maximum clamping voltage (VC) at 123 A peak pulse current, and 3000 W peak pulse power rating on a 10/1000 µs waveform - deployed in industrial motor drives and telecom power supplies.
For engineers reviewing the SMDJ15A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 123 A surges, thermal resistance (RθJA = 75 °C/W), unidirectional polarity with cathode band marking, and DO-214AB package compatibility with automated SMT assembly.
Technical Context
The SMDJ15A operates as a silicon avalanche diode optimized for fast transient suppression. Its glass-passivated junction enables sub-nanosecond response time (<1.0 ps), while the low-profile DO-214AB package supports high-density PCB layouts and meets J-STD-020 MSL Level 1 reflow requirements (260 °C peak).
Designed for single-polarity surge events, it delivers stable clamping across -55 °C to +150 °C operating junction temperature, with 0.1 %/°C temperature coefficient of VBR and 2.0 µA maximum reverse leakage at VRWM - ensuring predictable behavior in automotive body control modules and PoE-powered equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 15.0 V - Maximum continuous reverse operating voltage before clamping begins; sets system DC rail margin. |
| VBR @ IT=1 mA | 16.7–18.5 V - Measured breakdown range defining reliable avalanche onset; ensures consistent turn-on across production lots. |
| VC @ IPPM | 24.4 V - Clamped voltage at 123 A peak pulse; determines protected circuit's maximum transient overvoltage exposure. |
| PPPM (10/1000 µs) | 3000 W - Peak pulse power handling capacity; defines survivability against IEC 61000-4-5 Level 4 surges. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; guides heatsinking requirements. |
| IR @ VRWM | 2.0 µA - Reverse leakage current at rated stand-off voltage; minimizes standby power loss in battery-backed systems. |
Pinout & Package
DO-214AB (SMC J-Bend) package: molded plastic case with matte tin lead-free plating; cathode indicated by color band; terminals solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration. |
| Cathode | Current exit terminal; marked with color band | Connected to protected line (e.g., 12 V rail); avalanche conduction occurs when line voltage exceeds VRWM. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables suppression of ESD and lightning-induced transients before downstream ICs experience overstress. |
| Glass passivated junction | Improved long-term reliability and moisture resistance - critical for outdoor telecom enclosures and industrial PLCs. |
| Low profile DO-214AB | Height ≤2.6 mm - Allows placement beneath heat sinks or in space-constrained power supply modules. |
| MSL Level 1 compliance | Reflow capable up to 260 °C peak - eliminates pre-baking requirement and supports high-yield automated assembly. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensing circuits against inductive kickback and AC line surges. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed across DC bus rails and isolated signal lines. Use Value: Limits transient overvoltage to ≤24.4 V during 123 A surges, preventing latch-up or permanent damage to 3.3 V/5 V logic interfaces. | Use Scenario: Input-stage surge suppression on 48 V DC distribution boards feeding base station RF modules. IC Role / Device Role / Timing Role: Primary overvoltage protector on secondary-side DC outputs prior to DC-DC converters. Use Value: Withstands repeated 3000 W pulses per IEC 61000-4-5, maintaining <2 µA leakage to preserve efficiency in always-on systems. |
| Automotive Body Control Modules | POE-Powered Surveillance Cameras |
Use Scenario: CAN bus power rail protection and microcontroller I/O line hardening against load dump and jump-start transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply inputs with cathode tied to rail and anode grounded. Use Value: 15.0 V VRWM aligns with automotive battery nominal voltage; 150 °C TJ max supports under-hood operation without derating. | Use Scenario: Surge protection on IEEE 802.3af/at power sourcing equipment (PSE) output ports delivering 44–57 V DC. IC Role / Device Role / Timing Role: Secondary-level TVS on powered device (PD) input, clamping induced transients from cable coupling. Use Value: 24.4 V clamping voltage ensures safe operation of PD-side DC-DC controllers rated for ≤36 V input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC15 | Lower PPPM (1500 W), same VRWM (15 V), DO-214AA package (slightly smaller footprint) | Reduced surge energy handling; suitable only for IEC 61000-4-2 ESD, not full IEC 61000-4-5 line surges | Select SAC15 only if system-level testing confirms 1500 W sufficiency and board layout allows DO-214AA pitch. |
| 1.5SMC15A | Same electrical specs (VRWM/VBR/VC), identical DO-214AB package, but higher RθJA (90 °C/W) and no MSL1 rating | Requires pre-bake before reflow; less robust thermal performance in high-ambient environments | Choose 1.5SMC15A only for non-reflow applications or where extended thermal derating is acceptable. |
Compared with SAC15 and 1.5SMC15A, the SMDJ15A delivers superior surge robustness (3000 W), guaranteed MSL1 reflow compatibility, and tighter thermal resistance - making it the preferred choice for high-reliability industrial and telecom power protection where layout space permits DO-214AB.
Availability
SMDJ15A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, RoHS-compliant packaging, and traceable sourcing.
Supply support for SMDJ15A 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 high-efficiency power conversion and protection.
The SMDJ series is engineered for high-energy transient suppression in harsh environments - targeting applications demanding 3000 W pulse handling, low clamping voltage, and industrial-grade thermal and reflow reliability.
FAQ
What is the maximum clamping voltage of the SMDJ15A under a 10/1000 µs surge?
The SMDJ15A has a maximum clamping voltage (VC) of 24.4 V when subjected to its rated peak pulse current of 123 A on a 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees that downstream circuitry will not experience overvoltage beyond this threshold during specified surge events - a critical parameter for protecting 24 V-rated interface ICs in the SMDJ15A's target applications.
Does the SMDJ15A support lead-free reflow soldering?
Yes, the SMDJ15A meets J-STD-020 MSL Level 1 and is qualified for lead-free reflow with a maximum peak temperature of 260 °C. Its matte tin lead-free plating and DO-214AB package construction ensure reliable wetting and joint integrity without pre-baking - enabling direct integration into high-volume SMT lines used for manufacturing equipment containing the SMDJ15A.
How does the SMDJ15A differ from bidirectional variants like SMDJ15CA?
The SMDJ15A is unidirectional, with a defined cathode band and conduction only during reverse overvoltage events, whereas SMDJ15CA provides symmetrical clamping in both polarities. The SMDJ15A exhibits 2.0 µA reverse leakage at 15.0 V VRWM, while SMDJ15CA maintains the same leakage in either direction - making the SMDJ15A optimal for DC rail protection and SMDJ15CA suited for AC-coupled or differential signal lines where polarity reversal may occur.
What is the thermal resistance of the SMDJ15A, and how is it measured?
The SMDJ15A has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W, measured with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal per JEDEC standards. This value directly impacts steady-state power dissipation capability and must be factored into thermal design when the SMDJ15A is exposed to repetitive surges or elevated ambient temperatures in applications such as industrial motor drives using the SMDJ15A.
Can the SMDJ15A be used in automotive under-hood applications?
Yes, the SMDJ15A supports an operating junction temperature range of -55 °C to +150 °C and is rated for 150 °C maximum TJ, making it suitable for under-hood automotive environments. Its glass-passivated junction and DO-214AB package provide resistance to thermal cycling and humidity - key requirements for body control modules where the SMDJ15A protects 12 V supply rails from load dump transients.
SMDJ15A 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 123A
- 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
SMDJ15A FAQ
1.How can I place an order for SMDJ15A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ15A 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 SMDJ15A reliable?
The price and inventory of SMDJ15A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ15A is usually 5 days.
3.What payment methods are accepted for SMDJ15A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ15A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ15A?
SMDJ15A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ15A 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 SMDJ15A?
For technical support, including SMDJ15A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ15A requirements.
6.How does Aetrix verify that SMDJ15A is sourced from the original manufacturer or authorized distributors?
All SMDJ15A 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 SMDJ15A meets industry standards.
7.What is the process for return or replacement of SMDJ15A?
All SMDJ15A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ15A, 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 SMDJ15A part is unused and in its original packaging.
Return procedure for SMDJ15A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ15A Tags
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