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Taiwan Semiconductor Corporation SA26
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- Part No.:
- SA26
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA26.pdf
- Description:
- 500W, 32.1V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,803
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Product details
Overview
SA26 from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 26V working stand-off voltage (VWM), 28.9–35.3V breakdown voltage (VBR @ 1mA), and 45.4V clamping voltage (VC) at 11A peak pulse current - designed for automotive and industrial power rail protection against ESD and lightning-induced surges.
For engineers reviewing the SA26 datasheet, SA26 pinout, SA26 application, or SA26 equivalent, key selection criteria include its 500W 10/1000μs surge rating, <1.0ps response time, 1μA reverse leakage at 26V, AEC-Q101 qualification option (SA26H), and compatibility with 75°C lead temperature derating per JESD22-A114.
Technical Context
The SA26 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds VBR (28.9–35.3V) to clamp transients to ≤45.4V at 11A. Its low dynamic impedance enables effective suppression of fast-rising EFT and ESD events while maintaining <1μA leakage at rated VWM.
Designed for PCB-level protection of DC power inputs and signal lines, it complies with IEC 61000-4-2 (±30kV contact), IEC 61000-4-4 (±4kV), and ISO 7637-2 Pulse 1/2a/3a - with thermal stability up to TJ = 175°C and UL 94V-0 molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC bias margin. |
| VBR min/max | 28.9 V / 35.3 V @ 1 mA - Breakdown threshold range; ensures reliable turn-on across process variation and temperature. |
| VC @ IPPM | 45.4 V @ 11 A - Clamped voltage during 10/1000μs surge; determines maximum stress on downstream ICs. |
| PPK | 500 W - Peak pulse power handling at TA = 25°C; supports high-energy transients without failure. |
| IR @ VWM | <1 μA - Reverse leakage at 26V; minimizes standby power loss in battery-powered systems. |
| TJ max | 175 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with 0.400g mass and tin-plated leads per J-STD-002. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, epoxy-molded, cathode band marked on one end. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / low-side reference | Connected to system ground or lower-potential node; forms return path during clamping. |
| Cathode | Transient input / protected line connection | Connected to line being protected (e.g., 24V rail); conducts avalanche current to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified variant available (SA26H) | Validated for automotive powertrain and chassis applications per stress test requirements including HTOL, TCT, and ESD. |
| Fast response time | <1.0 ps from 0 V to VBR - limits voltage overshoot before clamping engages, critical for protecting fast-switching MOSFET gates. |
| Low clamping ratio (VC/VBR) | 1.30 typical (45.4V / 35.3V) - ensures minimal overvoltage margin between clamping and device breakdown limits. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - supports environmentally regulated industrial and automotive supply chains. |
| UL 94V-0 flammability rating | Molding compound self-extinguishes within 10 seconds after flame removal - required for safety-critical board-level protection. |
Applications
| Automotive Power Input Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: 24V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a, up to 120V/400ms) and alternator ripple. IC Role / Device Role: Primary overvoltage clamp on main power rail upstream of DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤45.4V during 500W surges, preventing latch-up or gate oxide damage in downstream 3.3V/5V logic. |
Use Scenario: Digital input modules receiving 24V dry-contact signals in factory automation cabinets subject to inductive kickback. IC Role / Device Role: Front-end transient suppressor on optocoupler input side, placed before series current-limiting resistor. Use Value: Absorbs >11A peak currents from relay coil de-energization without degradation, preserving signal integrity and opto lifetime. |
| LED Driver Overvoltage Clamp | Medical Equipment ESD Shielding |
|
Use Scenario: Constant-current LED drivers in streetlight systems subjected to lightning-induced surges on AC mains input rectified to 350V DC bus. IC Role / Device Role: Secondary clamp on low-voltage control rail (e.g., 26V bias for gate drivers), not main bus. Use Value: Prevents false triggering or destruction of PWM controllers and MOSFET drivers during fast transients coupled via shared ground paths. |
Use Scenario: Patient-monitoring devices with external sensor ports requiring IEC 60601-1-2 4th Ed. ESD immunity (±8kV contact). IC Role / Device Role: Board-level TVS on analog front-end signal lines (e.g., ECG electrode inputs) referenced to isolated ground. Use Value: Clamps ESD events to sub-50V levels within <1ps, avoiding saturation of precision instrumentation amplifiers and ADC input stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A (onsemi) | Same DO-214AC package; 26V VWM, 45.7V VC @ 10.9A; 400W rating; no AEC-Q101 option. | Limited to commercial-temp industrial use; lacks automotive qualification path. | Choose SMAJ26A only if AEC-Q101 is unnecessary and 400W surge capacity suffices. |
| P6SMB26A (Littelfuse) | DO-214AA package; 26V VWM, 42.1V VC @ 11.9A; 600W rating; AEC-Q101 qualified (P6SMB26AH). | Higher surge rating but larger footprint; requires PCB layout change due to different pad geometry. | Select P6SMB26A only when higher 600W margin is needed and DO-214AA layout is acceptable. |
Compared with SA26, SMAJ26A offers identical voltage ratings but lower surge capability and no automotive qualification, while P6SMB26A delivers higher power handling in a non-pin-compatible package - making SA26 the optimal balance of AEC-Q101 readiness, DO-15 footprint, and 500W performance.
Availability
SA26 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, LED lighting drivers, and medical diagnostic equipment requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for SA26 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs since 1979.
The SA Series was developed specifically for robust, high-reliability transient suppression in automotive and industrial environments - emphasizing AEC-Q101 compliance, tight VBR tolerance, and stable clamping under repetitive surge stress.
FAQ
What is the maximum clamping voltage of SA26 under standard 10/1000μs surge conditions?
The SA26 has a maximum clamping voltage (VC) of 45.4 V at 11.0 A peak pulse current (IPPM), measured per IEC 61000-4-5 10/1000μs waveform. This value is guaranteed across the full operating temperature range and ensures downstream ICs see no more than 45.4 V during surge events - a critical parameter for protecting 3.3V or 5V logic rails. The SA26 achieves this with low dynamic impedance and tight VBR distribution.
Is SA26 suitable for automotive applications requiring AEC-Q101 qualification?
The base SA26 is not AEC-Q101 qualified, but its variant SA26H is fully AEC-Q101 certified per Rev. L2105 documentation. SA26H undergoes accelerated stress testing including HTOL (1000h @ 175°C), temperature cycling, and ESD (HBM ±8kV, CDM ±1kV). For automotive power modules, infotainment, or ADAS subsystems, SA26H - not SA26 - must be specified to meet OEM reliability requirements.
How does SA26 compare to bidirectional TVS diodes like SA26CA in circuit implementation?
SA26 is unidirectional and requires correct polarity placement: cathode to the protected line, anode to ground. In contrast, SA26CA is bidirectional and symmetrical - usable on AC lines or floating signals without polarity concern. SA26 offers lower capacitance and faster response (<1.0 ps vs. 5.0 ns), making it preferred for DC power rail protection where polarity is fixed and speed is critical. SA26CA is reserved for data lines or AC-coupled interfaces.
What is the thermal derating behavior of SA26 above 25°C ambient?
SA26's peak pulse power (PPK) derates linearly above TA = 25°C per Figure 2 in the datasheet: at 75°C ambient, PPK drops to ~70% (350W), and at 125°C, it falls to ~40% (200W). Derating is based on junction temperature limit (TJ max = 175°C) and assumes standard PCB mounting (10 × 10 mm copper pads per lead). For sustained high-temp operation, SA26 must be paired with adequate copper pour and airflow - unlike SA26A, which shares same thermal profile but tighter VBR.
Can SA26 be used in parallel to increase surge current handling?
No - SA26 should not be paralleled without external balancing resistors. Due to VBR tolerances (28.9–35.3V), mismatched units will share current unequally, causing one diode to absorb most energy and fail prematurely. For higher IPPM, select a single higher-rated device (e.g., SA33 or SA36) or use a TVS array. Parallel use of SA26 is not recommended in production designs per TSC application guidance in Version L2105.
SA26 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- SA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 11A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA26 FAQ
1.How can I place an order for SA26 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA26 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 SA26 reliable?
The price and inventory of SA26 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA26 is usually 5 days.
3.What payment methods are accepted for SA26?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA26 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA26?
SA26 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA26 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 SA26?
For technical support, including SA26 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA26 requirements.
6.How does Aetrix verify that SA26 is sourced from the original manufacturer or authorized distributors?
All SA26 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 SA26 meets industry standards.
7.What is the process for return or replacement of SA26?
All SA26 units undergo pre-shipment inspection (PSI). If there is an issue with SA26, 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 SA26 part is unused and in its original packaging.
Return procedure for SA26:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA26 Tags
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