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Taiwan Semiconductor Corporation SA26H
- Part No.:
- SA26H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA26H.pdf
- Description:
- 500W, 32.1V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,863
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Product details
Overview
SA26H 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 maximum clamping voltage (VC) at 11A peak pulse current. It delivers AEC-Q101 qualification for automotive-grade surge protection in power supply rails and interface lines.
For engineers reviewing the SA26H datasheet, SA26H pinout, SA26H application, or SA26H equivalent, this page provides verified electrical parameters, clamping performance under 10/1000μs transients, thermal derating behavior, polarity marking, and direct AEC-Q101-compliant alternatives for automotive ESD and load-dump protection design.
Technical Context
The SA26H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (28.9–35.3V). It clamps transients to ≤45.4V at 11A (10/1000μs), with <1μA leakage above 10V and fast response (<1.0ps from 0V to VBR). Its junction temperature range spans −55°C to +175°C, supporting under-hood automotive environments.
Designed for single-polarity surge suppression, SA26H uses a planar junction structure in DO-204AC package with pure tin-plated leads, UL 94V-0 molding compound, and JESD201 Class 2 whisker resistance. It is not rated for bidirectional use-no "CA" or "C" suffix variant applies.
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 @ 1 mA - Confirmed avalanche onset range defining minimum system overvoltage margin |
| VC @ IPPM | 45.4 V @ 11 A - Clamped voltage during 10/1000μs surge, limiting downstream IC stress |
| PPK | 500 W - Peak pulse power rating per IEC 61000-4-5, enabling robust load-dump immunity |
| IR @ VWM | <1 μA - Negligible standby leakage, preserving low-power circuit integrity |
| TJ max | +175 °C - Extended junction temperature rating for engine-control unit (ECU) placement |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400g mass and cathode band marking |
Pinout & Package
SA26H is a two-terminal unidirectional TVS diode in DO-204AC (DO-15) package. The cathode is marked by a band on the body; anode is unmarked. 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 conduction terminal | Connected to ground or lower-potential rail; conducts during forward surge (e.g., reverse battery) |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 24V supply); initiates clamping when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS power rails |
| 500W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 5a (load dump) up to 500W without degradation |
| <1.0ps response time | Clamps ESD and fast transients before sensitive logic or analog circuits experience overstress |
| UL 94V-0 molding compound | Ensures flame-retardant reliability in enclosed automotive enclosures and high-temp zones |
| Junction temp: −55°C to +175°C | Supports operation in under-hood environments where ambient exceeds 125°C |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24V supply inputs in engine control units (ECUs) against ISO 7637-2 load-dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and DC-DC input. Use Value: Limits voltage to ≤45.4V during 500W surges, preventing damage to upstream regulators and microcontrollers. | Use Scenario: Shielding 4–20mA current-loop sensor interfaces from EFT bursts in factory automation PLCs. IC Role / Device Role / Timing Role: Reverse-biased clamping element across signal and return lines. Use Value: Sub-1μA leakage preserves loop accuracy; 45.4V clamping prevents op-amp input saturation during 10/1000μs noise events. |
| LED Lighting Driver Protection | Automotive CAN Transceiver Protection |
Use Scenario: Safeguarding constant-current LED drivers in commercial vehicle lighting against inductive switching spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS on driver output to absorb flyback energy from relay or solenoid loads. Use Value: 11A peak pulse current rating handles repetitive 100V/10A inductive kickbacks without thermal runaway. | Use Scenario: Adding secondary-level surge immunity to CAN_H/CAN_L lines in automotive gateways exposed to board-level ESD. IC Role / Device Role / Timing Role: Unidirectional clamping on CAN_H referenced to ground (not differential). Use Value: 26V VWM ensures no conduction during normal CAN signaling (±12V differential), while clamping >28.9V transients to protect PHY inputs. |
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 DO-214AC package; 26V VWM, but 400W PPK rating and higher VC (42.1V @ 9.2A) | Limited to non-AEC-Q101 industrial use; lacks automotive qualification and extended TJ rating | Select SMAJ26A only for cost-sensitive non-automotive designs where 100W lower surge margin is acceptable |
| 1.5KE27A | DO-201AD package; 27V VWM, 1500W PPK, but slower response (>1ns) and no AEC-Q101 validation | Higher power handling but unsuitable for space-constrained PCBs or automotive qualification requirements | Choose 1.5KE27A only for legacy industrial systems requiring higher peak power and accepting larger footprint and no automotive compliance |
Compared with SMAJ26A and 1.5KE27A, SA26H uniquely combines AEC-Q101 qualification, DO-15 compactness, 500W surge capability, and −55°C to +175°C operation-making it the only drop-in solution for new automotive ECUs requiring validated reliability and thermal resilience.
Availability
SA26H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, LED lighting driver surge suppression, and CAN transceiver secondary-level ESD protection requiring stable component supply across production lifecycles.
Supply support for SA26H 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and bipolar transistors.
The SA Series was designed specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing AEC-Q101 compliance, tight VBR tolerance, and robust thermal performance in axial-leaded packages.
FAQ
What is the clamping voltage of SA26H at its rated peak pulse current?
The SA26H has a maximum clamping voltage (VC) of 45.4 V at 11 A peak pulse current (IPPM), measured under the standard 10/1000 μs double-exponential waveform. This value ensures downstream components see limited overvoltage during ISO 7637-2 load-dump events. The SA26H datasheet confirms this parameter in Table 3 under "Maximum clamping voltage VC@IPPM" for part number SA26H.
Is SA26H suitable for bidirectional transient protection?
No, SA26H is strictly unidirectional. Its marking includes a cathode band, and its electrical specifications-including breakdown voltage and clamping behavior-are defined only for reverse-bias operation. For bidirectional protection, TSC offers SA26CA (with "CA" suffix), which is not interchangeable with SA26H. Using SA26H in bidirectional configurations risks failure during positive transients.
Does SA26H meet AEC-Q101 requirements for automotive use?
Yes, SA26H is explicitly AEC-Q101 qualified, as confirmed in the "FEATURES" section and ordering code note ("H" means AEC-Q101 qualified). It passes stress tests including high-temperature operating life, temperature cycling, and ESD per AEC-Q101 Rev D. This makes SA26H suitable for front-end power protection in engine control modules, body control units, and ADAS domain controllers.
What is the maximum junction temperature rating for SA26H?
The SA26H has a maximum junction temperature (TJ MAX) of +175°C, validated per absolute maximum ratings table. This enables reliable operation in under-hood environments where ambient temperatures exceed 125°C-critical for modern automotive electronics. Derating curves in Figure 2 confirm usable power dissipation down to zero at 175°C ambient when mounted per JEDEC standards.
How does SA26H differ from SA26A?
SA26H and SA26A share identical electrical specs (VWM = 26 V, VBR = 28.9–35.3 V, VC = 45.4 V), but SA26H carries AEC-Q101 qualification and is supplied in tape-and-reel packaging (3,500 pcs), whereas SA26A is industrial-grade only and offered in both tape-and-reel and ammo box formats. The "H" suffix denotes automotive qualification-not a parametric difference.
SA26H 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:
- -
- 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)
SA26H FAQ
1.How can I place an order for SA26H through Aetrix?
Please submit a Request for Quotation (RFQ) for SA26H 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 SA26H reliable?
The price and inventory of SA26H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA26H is usually 5 days.
3.What payment methods are accepted for SA26H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA26H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA26H?
SA26H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA26H 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 SA26H?
For technical support, including SA26H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA26H requirements.
6.How does Aetrix verify that SA26H is sourced from the original manufacturer or authorized distributors?
All SA26H 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 SA26H meets industry standards.
7.What is the process for return or replacement of SA26H?
All SA26H units undergo pre-shipment inspection (PSI). If there is an issue with SA26H, 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 SA26H part is unused and in its original packaging.
Return procedure for SA26H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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