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Taiwan Semiconductor Corporation SA26A
- Part No.:
- SA26A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA26A.pdf
- Description:
- TVS DIODE 26VWM 53.5VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,313
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Product details
Overview
SA26A from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 26V working stand-off voltage, 28.9–31.9V breakdown voltage at 1mA test current, and 53.5V clamping voltage at 12.4A peak pulse current. It protects automotive and industrial power rails against ESD, EFT, and inductive switching transients.
For engineers reviewing the SA26A datasheet, SA26A pinout, SA26A application, or SA26A equivalent, key selection criteria include its 26V VWM compatibility with 24V systems, low 1μA leakage at rated voltage, AEC-Q101 qualification option (SA26AH), fast sub-nanosecond response to transients, and DO-15 footprint suitability for high-reliability board-level surge protection.
Technical Context
The SA26A operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (28.9–31.9V) and clamping transient energy to ≤53.5V at 12.4A. Its junction temperature rating of –55°C to +175°C supports under-hood automotive use.
It complies with ANSI/IEEE C62.35 surge standards and delivers 500W peak pulse power per 10/1000μs waveform. The device exhibits <1.0ps response time from 0V to VBR and maintains <1μA reverse leakage above 10V, ensuring minimal standby power loss in protected circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous DC or RMS operating voltage before clamping begins; matches 24V nominal systems with margin. |
| VBR @ IT=1mA | 28.9–31.9 V - Breakdown voltage range at 1mA test current; defines precise turn-on threshold for transient suppression. |
| VC @ IPPM=12.4A | 53.5 V - Clamping voltage during 10/1000μs surge; limits downstream IC stress to safe levels. |
| PPK | 500 W - Peak pulse power handling capability; sustains high-energy transients without failure. |
| IR @ VWM | <1 μA - Reverse leakage current at 26V; ensures negligible quiescent current in always-on protection circuits. |
| TJ max | +175 °C - Maximum junction temperature; enables deployment in engine control units and power converters. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400g mass and UL 94V-0 molding compound. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking polarity. Leads are pure tin-plated, solderable per J-STD-002, and pass JESD 201 Class 2 whisker testing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-side return path; completes clamping loop during transient events. |
| Cathode | Protected line input | Connected to 24V rail or signal line; absorbs positive-going surges by avalanche conduction to anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified variant available | SA26AH meets automotive reliability requirements including temperature cycling, HTRB, and ESD robustness. |
| Low impedance surge path | Clamps 12.4A transients to only 53.5V, minimizing voltage overshoot on protected 24V lines. |
| Sub-nanosecond response | Triggers in <1.0ps from 0V to VBR, faster than most microcontroller I/O protection needs. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS directives for environmentally constrained applications. |
| High surge endurance | Sustains 500W (10/1000μs) pulses without degradation-validated per ANSI/IEEE C62.35. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 24V supply lines in engine control modules from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and regulator input. Use Value: Limits transient excursions to ≤53.5V, preventing damage to downstream LDOs and microcontrollers rated for 36V absolute max. | Use Scenario: Shielding digital input channels of programmable logic controllers from inductive kickback of solenoid drivers. IC Role / Device Role / Timing Role: Standoff protection element across 24V optocoupler inputs. Use Value: Absorbs 500W surges without latch-up, preserving signal integrity and enabling >100k-cycle field reliability. |
| LED Driver Overvoltage Clamp | ESD-Sensitive Sensor Interface |
Use Scenario: Safeguarding constant-current LED driver ICs in commercial lighting against line transients during hot-swap events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input bus prior to buck controller. Use Value: Withstands repeated 10/1000μs surges up to 500W while maintaining <1μA leakage-no impact on dimming accuracy. | Use Scenario: Front-end protection for automotive-grade ambient light or position sensors connected to CAN/LIN buses. IC Role / Device Role / Timing Role: Low-capacitance TVS on analog sensor output line referenced to chassis ground. Use Value: Sub-ns response prevents ESD-induced latch-up in precision amplifiers; DO-15 footprint allows placement near connector entry points. |
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 | Same VWM (26V), but lower PPK (400W); SMA package (surface-mount) vs. DO-15 (through-hole). | Preferred for space-constrained PCBs; less suitable for high-temperature through-hole mounting in engine bays. | Select SMAJ26A only if board area is critical and 400W surge rating suffices. |
| P6KE27A | Higher VWM (27V), same DO-15 package; 600W PPK but wider VBR tolerance (30.0–36.0V). | Better for 27V nominal systems; clamps at higher voltage (58.1V), increasing stress on downstream components. | Choose P6KE27A when tighter VWM margin is needed and higher clamping voltage is acceptable. |
Compared with SMAJ26A and P6KE27A, the SA26A offers optimal balance of 500W surge capacity, precise 26V standoff, and DO-15 mechanical robustness-making it preferred for automotive and industrial 24V rail protection where thermal derating and lead strength matter.
Availability
SA26A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input conditioning, and LED driver overvoltage clamping requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SA26A 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SA Series was designed specifically for high-reliability transient suppression in 12V/24V/48V systems, emphasizing AEC-Q101 qualification, tight parameter tolerances, and robust surge endurance in axial packages.
FAQ
What is the maximum clamping voltage of the SA26A under standard 10/1000μs surge conditions?
The SA26A clamps to a maximum of 53.5 V when subjected to its rated peak pulse current of 12.4 A under the 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream 24V-rated ICs. The SA26A achieves this performance while maintaining low dynamic impedance and sub-nanosecond response.
Is the SA26A suitable for automotive applications requiring AEC-Q101 qualification?
Yes-the SA26A has an AEC-Q101-qualified variant designated SA26AH, which undergoes full automotive reliability testing including temperature cycling, high-temperature reverse bias, and ESD. While the base SA26A part is not automatically qualified, SA26AH is explicitly listed in TSC's ordering matrix and meets all AEC-Q101 stress test requirements for discrete TVS diodes.
How does the SA26A differ from the SA26 (non-A) version?
The SA26A features a tighter breakdown voltage range (28.9–31.9 V) compared to SA26 (28.9–35.3 V), resulting in more consistent clamping behavior and reduced variation in protection threshold. Both share identical VWM (26 V), PPK (500 W), and DO-15 packaging-but SA26A is optimized for designs demanding tighter parametric control in safety-critical 24V systems.
What is the reverse leakage current specification for the SA26A at its working stand-off voltage?
The SA26A exhibits a maximum reverse leakage current (IR) of 1 μA when biased at its 26 V working stand-off voltage (VWM), measured at TA = 25°C. This ultra-low leakage ensures minimal power loss in always-on protection configurations and avoids false triggering in high-impedance sensing circuits powered from the same rail protected by the SA26A.
Can the SA26A be used in bidirectional configurations?
No-the SA26A is a unidirectional TVS diode intended for DC rail protection with defined polarity (cathode toward the protected line). For bidirectional protection, TSC specifies CA-suffixed parts (e.g., SA26CA) or explicitly bipolar variants. Using SA26A in reverse-biased AC or bipolar signal paths risks permanent damage due to forward conduction beyond its 3.5 V VF rating at 35 A.
SA26A 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:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 12.4A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA26A FAQ
1.How can I place an order for SA26A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA26A 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 SA26A reliable?
The price and inventory of SA26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA26A is usually 5 days.
3.What payment methods are accepted for SA26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA26A?
SA26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA26A 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 SA26A?
For technical support, including SA26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA26A requirements.
6.How does Aetrix verify that SA26A is sourced from the original manufacturer or authorized distributors?
All SA26A 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 SA26A meets industry standards.
7.What is the process for return or replacement of SA26A?
All SA26A units undergo pre-shipment inspection (PSI). If there is an issue with SA26A, 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 SA26A part is unused and in its original packaging.
Return procedure for SA26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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