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Taiwan Semiconductor Corporation SA26AH
- Part No.:
- SA26AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA26AH.pdf
- Description:
- TVS DIODE 26VWM 53.5VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,266
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Product details
Overview
SA26AH from Taiwan Semiconductor is an AEC-Q101-qualified 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 (VWM), 28.9–35.3V breakdown voltage (VBR), and 45.4V clamping voltage (VC) at 11A peak pulse current - designed for automotive ECU and power-line surge protection.
For engineers reviewing the SA26AH datasheet, SA26AH pinout, SA26AH application, or SA26AH equivalent, key selection criteria include its AEC-Q101 qualification, unidirectional polarity, 175°C max junction temperature, low leakage (<1μA @ 26V), and DO-15 mechanical compatibility with legacy through-hole PCB layouts.
Technical Context
The SA26AH operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (28.9–35.3V at 1mA test current), clamping transients to ≤45.4V at 11A IPPM. Its fast response time (<1.0ps from 0V to VBR) ensures protection of downstream ICs against ESD and load-dump events.
It features a maximum junction temperature of 175°C, thermal derating per Fig.2, and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements - confirming suitability for under-hood automotive environments where thermal and mechanical reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 28.9 V / 35.3 V at 1 mA - Ensures reliable turn-on within defined tolerance band across production lot |
| VC @ IPPM | 45.4 V at 11 A - Clamped voltage during 10/1000μs surge, limiting stress on protected circuitry |
| PPK | 500 W - Peak pulse power handling capability per single non-repetitive 10/1000μs waveform |
| IR @ VWM | <1 μA - Negligible leakage current at rated stand-off voltage, minimizing standby power loss |
| TJ max | 175 °C - Enables operation in high-temperature automotive locations without thermal shutdown |
| Package | DO-204AC (DO-15) - Standard through-hole package with tin-plated leads, compatible with wave soldering |
Pinout & Package
DO-204AC (DO-15) package with axial leads: cathode indicated by band marking; anode and cathode terminals support unidirectional transient suppression in series with power rail or signal line.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line (e.g., battery feed); conducts forward during overvoltage clamp |
| Cathode | Output/Load side | Connected to ground or low-impedance return path; defines polarity and clamping reference |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing |
| 500W peak pulse rating | Withstands ISO 7637-2 Pulse 5a (load dump) up to 11A peak current without degradation |
| <1.0ps response time | Clamps ESD events (IEC 61000-4-2) before sensitive logic inputs experience overstress |
| UL 94V-0 molding compound | Self-extinguishing encapsulation prevents flame propagation in enclosed engine bay enclosures |
| Pure tin-plated leads | RoHS-compliant, solderable per J-STD-002, eliminates lead-free assembly compatibility issues |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting microcontroller power supply in engine control unit (ECU) against ISO 7637-2 load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input to clamp surges above 26V. Use Value: Limits clamped voltage to 45.4V, ensuring downstream 5V LDO remains within absolute maximum ratings during 12V system load dump. | Use Scenario: Shielding analog sensor outputs (e.g., pressure or temperature sensors) from EFT bursts in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: TVS mounted at connector interface to shunt fast transients before reaching op-amp input stage. Use Value: Sub-nanosecond response captures EFT edges (5ns rise time), preventing latch-up or offset drift in precision front-end amplifiers. |
| LED Lighting Driver Protection | DC Motor Control Board Protection |
Use Scenario: Safeguarding constant-current LED driver ICs in automotive headlamp modules from inductive kickback during PWM dimming. IC Role / Device Role / Timing Role: Placed across MOSFET drain-source to absorb flyback energy during switching transitions. Use Value: 500W rating handles repetitive 10/1000μs spikes from 200mA+ LED strings, extending driver IC lifetime under thermal stress. | Use Scenario: Suppressing voltage spikes generated by brushed DC motor commutation in automotive seat/mirror actuators. IC Role / Device Role / Timing Role: Connected across motor terminals to clamp back-EMF transients before reaching H-bridge gate drivers. Use Value: 175°C TJ rating allows placement near motor housing without thermal derating, maintaining clamping performance at elevated ambient temperatures. |
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 bidirectional; lower PPK (400W); SMA package (SMT) | Requires PCB redesign for surface-mount; unsuitable for unidirectional-only circuits needing polarity enforcement | Select only if board space constraints mandate SMT and bidirectional protection is acceptable |
| 1.5KE27A | Higher VWM (27V), same DO-15 package; 1500W rating but larger footprint; higher IR (5μA @ 27V) | Over-spec'd for 26V systems; may not trigger early enough to protect 24V-rated ICs during marginal overvoltage | Prefer SA26AH for tighter VWM/VBR matching and lower leakage in 24V automotive subsystems |
Compared with SMAJ26A and 1.5KE27A, the SA26AH offers optimal balance of AEC-Q101 compliance, precise 26V stand-off, low leakage, and through-hole DO-15 compatibility - making it the preferred choice for new automotive designs requiring validated reliability and legacy layout reuse.
Availability
SA26AH is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and LED lighting systems requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SA26AH 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 is engineered specifically for robust transient suppression in harsh automotive environments, emphasizing AEC-Q101 qualification, high-temperature operation, and repeatable clamping performance across voltage grades.
FAQ
What does the "H" suffix in SA26AH signify?
The "H" suffix in SA26AH indicates full AEC-Q101 qualification - verified through accelerated stress testing including temperature cycling, high-temperature reverse bias, and mechanical shock. This certification confirms SA26AH's suitability for automotive powertrain and body electronics where reliability under thermal and vibration stress is mandatory.
Is SA26AH unidirectional or bidirectional?
SA26AH is a unidirectional TVS diode, as confirmed by its part numbering convention (no "CA" or "C" suffix), cathode band marking, and electrical specifications limited to reverse-biased clamping. It must be installed with correct polarity - anode to line, cathode to ground - to function properly in SA26AH-based protection circuits.
What is the maximum clamping voltage of SA26AH at rated surge current?
The maximum clamping voltage (VC) of SA26AH is 45.4 V at 11 A peak pulse current (IPPM), measured under the standard 10/1000μs waveform. This value is guaranteed across the full operating temperature range and ensures protected ICs remain within safe voltage limits during transient events.
Can SA26AH replace SA26A in existing designs?
SA26AH can replace SA26A only if AEC-Q101 qualification is required and the design accommodates identical electrical parameters - both share VWM = 26 V, VBR = 28.9–35.3 V, and VC = 45.4 V. However, SA26AH adds automotive-grade validation; no layout change is needed since both use DO-204AC (DO-15) packaging.
Does SA26AH meet RoHS and halogen-free requirements?
Yes, SA26AH complies with RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The device uses lead-free pure tin plating on leads and UL 94V-0 compliant molding compound - fully documented in TSC's material declarations and available upon request for SA26AH procurement.
SA26AH 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:
- -
- 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)
SA26AH FAQ
1.How can I place an order for SA26AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA26AH 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 SA26AH reliable?
The price and inventory of SA26AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA26AH is usually 5 days.
3.What payment methods are accepted for SA26AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA26AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA26AH?
SA26AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA26AH 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 SA26AH?
For technical support, including SA26AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA26AH requirements.
6.How does Aetrix verify that SA26AH is sourced from the original manufacturer or authorized distributors?
All SA26AH 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 SA26AH meets industry standards.
7.What is the process for return or replacement of SA26AH?
All SA26AH units undergo pre-shipment inspection (PSI). If there is an issue with SA26AH, 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 SA26AH part is unused and in its original packaging.
Return procedure for SA26AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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