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Diodes Incorporated SA15A-T
- Part No.:
- SA15A-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA15A-T.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:8,201
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Product details
Overview
SA15A-T from Diodes Incorporated is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-15 package, designed for primary-level overvoltage protection in DC power rails and signal lines. It features a 15V reverse standoff voltage (VR), 16.7–18.5V breakdown range (VBR), 24.4V clamping voltage (VC) at 20.6A peak pulse current (IPP), and operates from –65°C to +175°C.
For engineers reviewing the SA15A-T datasheet, SA15A-T pinout, SA15A-T application, or SA15A-T equivalent, key selection criteria include clamping performance under 10/1000µs surge, thermal derating above 25°C ambient, unidirectional polarity handling, and compatibility with automated tape-and-reel assembly (4K/reel).
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1.0 ps) and stable clamping during transient events such as ESD, lightning-induced surges, and inductive switching spikes. Its unidirectional configuration provides asymmetric conduction-blocking reverse voltage up to 15V while clamping positive transients above VBR.
The device is rated for 500W non-repetitive peak pulse power (tp = 1.0 ms, 10/1000 µs waveform), with steady-state power dissipation of 1.0W at TL = 75°C. Clamping voltage remains ≤24.4V at IPP = 20.6A, ensuring downstream ICs see limited overvoltage stress during standardized surge tests.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 500 W - Withstands 10/1000 µs surge per REA standard without failure |
| Reverse Standoff Voltage (VR) | 15 V - Maximum continuous DC or RMS voltage before clamping initiates |
| Breakdown Voltage (VBR) | 16.7–18.5 V @ 1.0 mA - Confirmed turn-on threshold for reliable overvoltage detection |
| Clamping Voltage (VC) | 24.4 V @ IPP = 20.6 A - Limits transient voltage seen by protected circuitry |
| Peak Pulse Current (IPP) | 20.6 A - Sustains single 10/1000 µs surge at rated clamping level |
| Operating Temperature | –65°C to +175°C - Validated operation across automotive under-hood and industrial environments |
| Package | DO-15 - Through-hole molded plastic case with 9.5 mm lead length, UL 94V-0 rated |
Pinout & Package
DO-15 package: axial-leaded, cylindrical molded plastic case with cathode band marking. Leads are tin-plated, solderable per MIL-STD-202 Method 208, RoHS-compliant matte tin finish available.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration |
| Cathode | Clamping output / surge sink | Connected to protected line; conducts surge current to ground when VR exceeded |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable VBR tolerance and long-term reliability under thermal cycling |
| 500W peak pulse rating | Meets IEC 61000-4-5 Level 4 (4 kV) surge immunity requirements for industrial ports |
| Fast response time | <1.0 ps - Clamps transients before sensitive logic or analog circuitry responds |
| Unidirectional polarity | Prevents reverse leakage in DC-biased lines while enabling robust positive-surge suppression |
| Tape-and-reel packaging | 4K/reel on 13-inch reels - Supports high-volume automated PCB assembly |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24V DC input channels exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping element placed between connector and TVS array or regulator input. Use Value: Limits transient voltage to ≤24.4V, protecting downstream LDOs and microcontroller GPIOs from damage. |
Use Scenario: LIN bus transceiver power supply rail subjected to battery disconnect transients. IC Role / Device Role / Timing Role: Standalone overvoltage clamp on VCC line upstream of transceiver IC. Use Value: Maintains <25V rail during 100V/50ms load dump event, preventing latch-up or burnout. |
| DC Power Adapter Input Stage | Telecom Remote Power Feeds (RPF) |
Use Scenario: AC/DC adapter secondary-side 15V output feeding isolated DC-DC converters. IC Role / Device Role / Timing Role: Secondary-side surge limiter guarding against backfeed transients and capacitor discharge spikes. Use Value: Clamps 10/1000 µs surges to 24.4V, preserving isolation barrier integrity and converter startup stability. |
Use Scenario: 48V remote power feed lines in PoE-powered base stations experiencing induced lightning surges. IC Role / Device Role / Timing Role: First-stage protector on DC input before DC-DC regulation and Ethernet PHY interface. Use Value: Absorbs up to 500W surge energy while holding line voltage below 25V for 20+ µs, meeting Telcordia GR-1089-CORE Zone 3 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P6KE15A | Same VR (15V), higher VC (24.5V), identical DO-15 package, but lower IPP (20.4A) and Ppk (600W) | Valid for same surge classes but exhibits slightly higher clamping; not optimized for high-temp derating | Preferred where higher peak power margin is needed and thermal environment is controlled |
| SMAJ15A | Surface-mount SMA package, lower Ppk (400W), same VR/VC specs, tighter VBR tolerance (16.7–17.9V) | Requires PCB redesign for SMT placement; unsuitable for through-hole legacy designs | Select only when board space constraints mandate SMT and 400W rating suffices |
Compared with SA15A-T, P6KE15A offers higher peak power headroom but less thermal robustness above 75°C, while SMAJ15A sacrifices mechanical ruggedness and surge capacity for compact layout-neither matches SA15A-T's balance of through-hole reliability, 500W rating, and wide temperature operation.
Availability
SA15A-T is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and telecom remote power feeds requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SA15A-T 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 and manufacturing operations across Asia and the Americas.
SA15A-T belongs to the SAxxA series of high-power unidirectional TVS diodes, engineered specifically for cost-effective, high-reliability overvoltage protection in harsh-environment power and signal interfaces.
FAQ
Is SA15A-T RoHS compliant?
Yes, SA15A-T is manufactured with matte tin-plated leads and complies with RoHS Directive 2011/65/EU, including exemptions for high-temperature soldering and glass passivation per Annexes 5 and 7. Full compliance documentation is available upon request.
What is the maximum allowable lead temperature during soldering?
The maximum lead temperature for SA15A-T is 260°C for 10 seconds, consistent with IPC/JEDEC J-STD-020C Level 1 moisture sensitivity. Reflow profiles must avoid exceeding this limit to prevent internal die stress or bond wire damage.
Can SA15A-T be used in bidirectional configurations?
No - SA15A-T is unidirectional only. For bidirectional protection at 15V standoff, use SA15CA-T (suffix "CA" denotes bidirectional). The "A" suffix explicitly indicates unidirectional polarity and cathode-band marking.
How does SA15A-T perform under repeated surge stress?
SA15A-T is rated for non-repetitive pulses only. Under repetitive 10/1000 µs surges, derating is required: at 25°C ambient, maximum duty cycle is 0.1% (1 pulse per second); at 75°C, average power must stay ≤1.0W per Fig. 5 in DS21501 Rev. 12.
SA15A-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 20.6A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-15
SA15A-T FAQ
1.How can I place an order for SA15A-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SA15A-T 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 SA15A-T reliable?
The price and inventory of SA15A-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA15A-T is usually 5 days.
3.What payment methods are accepted for SA15A-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA15A-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA15A-T?
SA15A-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA15A-T 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 SA15A-T?
For technical support, including SA15A-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA15A-T requirements.
6.How does Aetrix verify that SA15A-T is sourced from the original manufacturer or authorized distributors?
All SA15A-T 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 SA15A-T meets industry standards.
7.What is the process for return or replacement of SA15A-T?
All SA15A-T units undergo pre-shipment inspection (PSI). If there is an issue with SA15A-T, 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 SA15A-T part is unused and in its original packaging.
Return procedure for SA15A-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA15A-T Tags
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