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Diodes Incorporated SMAJ15A-13
- Part No.:
- SMAJ15A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15A-13.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,243
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Product details
Overview
SMAJ15A-13 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 15V reverse standoff voltage (VRWM), 16.7–18.5V breakdown voltage (VBR) at 1mA, 24.4V max clamping voltage (VC) at 16.4A peak pulse current (IPP), and operates from –55°C to +150°C.
For engineers reviewing the SMAJ15A-13 datasheet, SMAJ15A-13 pinout, SMAJ15A-13 application, or SMAJ15A-13 equivalent, key selection criteria include clamping performance under 8.3ms surge, unidirectional polarity handling, SMA package thermal limits, and compliance with IEC 61000-4-2/4-5 level 4 ESD and surge immunity requirements.
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1ps) and low dynamic impedance during transient events. Its unidirectional configuration provides forward conduction path only when reverse-biased beyond VBR, enabling precise clamping without leakage in normal operation.
The device is rated for 400W non-repetitive peak pulse power (PPK) at TA = 25°C, derated linearly above ambient temperature per Fig. 1, and supports steady-state dissipation of 1.0W at TL = 75°C. It meets JEDEC-standard 8.3ms half-sine surge testing with ≤4 pulses/minute duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 8.3ms surges up to this level without failure |
| Reverse Standoff Voltage | 15 V - maximum continuous DC or RMS voltage before significant leakage |
| Breakdown Voltage | 16.7–18.5 V @ 1 mA - guaranteed conduction onset window for reliable triggering |
| Clamping Voltage | 24.4 V @ 16.4 A - maximum voltage seen by protected circuit during specified surge |
| Operating Temperature | –55°C to +150°C - qualified for automotive under-hood and industrial control environments |
| Package | SMA - surface-mount plastic case with UL 94V-0 flammability rating and 0.064g mass |
Pinout & Package
SMA (DO-214AC) package: 2-terminal surface-mount device with cathode band marking on unidirectional variants. Terminals are solderable per MIL-STD-202, Method 208; lead-free matte tin plating available.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction | Connected to lower-potential side (e.g., GND) in unidirectional clamp configuration |
| Cathode | Current exit during reverse breakdown | Marked with band; connected to protected line (e.g., 12V rail) to shunt surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable VBR tolerance and long-term reliability under thermal cycling |
| 400W peak pulse rating | Supports IEC 61000-4-5 Level 4 (4kV/2Ω) surge protection in compact footprint |
| Fast response time | <1 ps - clamps transients before downstream ICs experience overstress |
| RoHS-compliant finish | Meets EU Directive Annex exemptions for high-temp solder and glass; no lead or halogen restrictions violated |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start surges. IC Role / Device Role / Timing Role: Primary clamping element placed between power input and upstream fuse or DC-DC converter. Use Value: Limits transient voltage to ≤24.4V, preventing damage to 36V-rated regulators and CAN transceivers. | Use Scenario: 24V digital input modules receiving signals from field sensors in factory automation. IC Role / Device Role / Timing Role: Input-side TVS on each channel to absorb induced surges from relay switching or lightning coupling. Use Value: Maintains signal integrity during 1kV/500Ω surge tests (IEC 61000-4-5) without latch-up or parameter shift. |
| Telecom DC Power Feeds | Consumer USB-C Power Delivery |
Use Scenario: Central office power distribution boards feeding remote radio units over long copper runs. IC Role / Device Role / Timing Role: Secondary overvoltage guard after bulk MOVs, providing precise clamping near equipment input. Use Value: Delivers tighter VC tolerance than MOVs alone, protecting PoE controllers and Ethernet PHYs. | Use Scenario: USB-C receptacle circuits handling up to 20V PD negotiation and accidental 24V misconnection. IC Role / Device Role / Timing Role: Unidirectional clamp on VBUS line referenced to chassis ground. Use Value: Clamps 24V faults to 24.4V within nanoseconds, avoiding overvoltage shutdown of PD controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15CA-13 | Bi-directional version; symmetric clamping for AC-coupled or floating lines | Required where bidirectional surges occur (e.g., RS-485, audio lines) | Select only if line lacks defined polarity or carries AC signals |
| SMBJ15A-13 | Same electrical specs but SMB package - 20% larger footprint, 600W PPK rating | Better thermal margin in high-ambient or high-duty-cycle designs | Choose when board space allows and higher surge margin is needed |
Compared with SMAJ15CA-13, the unidirectional SMAJ15A-13 offers lower leakage and tighter VRWM/VBR matching for DC rails; versus SMBJ15A-13, it trades 200W lower surge rating for 30% smaller PCB area and identical clamping performance at rated IPP.
Availability
SMAJ15A-13 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and telecom power feed applications requiring stable component supply across multi-year production cycles.
Supply support for SMAJ15A-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the US.
The SMAJ series belongs to Diodes' transient voltage suppression product line, engineered specifically for robust, cost-effective overvoltage protection in space-constrained, high-reliability DC power and interface applications.
FAQ
What is the maximum clamping voltage of SMAJ15A-13 at its rated peak pulse current?
The maximum clamping voltage (VC) is 24.4 V at 16.4 A peak pulse current (IPP), measured under the standard 8.3 ms half-sine waveform per JEDEC. This value is guaranteed across the full operating temperature range and represents the highest voltage the protected circuit will experience during a compliant surge event.
Is SMAJ15A-13 RoHS compliant and lead-free?
Yes - SMAJ15A-13 is RoHS compliant per EU Directive 2011/65/EU, including exemptions for high-temperature solder and glass. It features matte tin lead-free plating and meets J-STD-020C moisture sensitivity level 1. The "-13" suffix denotes tape-and-reel packaging compatible with SMT assembly.
How does SMAJ15A-13 differ from SMAJ15CA-13?
SMAJ15A-13 is unidirectional with cathode-band polarity marking; SMAJ15CA-13 is bi-directional with no polarity indicator and symmetric breakdown in both directions. The latter has double the IR (leakage) specification for VRWM ≤10V, but both share identical VRWM, VBR, VC, and PPK ratings.
Can SMAJ15A-13 be used in place of a 12V Zener diode for overvoltage protection?
No - SMAJ15A-13 is not a regulation device. It conducts heavily only during transient overvoltages and exhibits high dynamic impedance outside its clamping region. Unlike a Zener, it does not regulate or maintain a stable voltage under steady-state conditions and must be paired with upstream current limiting for sustained overvoltage scenarios.
SMAJ15A-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 16.4A
- 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:
- SMA
SMAJ15A-13 FAQ
1.How can I place an order for SMAJ15A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15A-13 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 SMAJ15A-13 reliable?
The price and inventory of SMAJ15A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ15A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15A-13?
SMAJ15A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15A-13 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 SMAJ15A-13?
For technical support, including SMAJ15A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15A-13 requirements.
6.How does Aetrix verify that SMAJ15A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ15A-13 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 SMAJ15A-13 meets industry standards.
7.What is the process for return or replacement of SMAJ15A-13?
All SMAJ15A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15A-13, 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 SMAJ15A-13 part is unused and in its original packaging.
Return procedure for SMAJ15A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ15A-13 Tags
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