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Taiwan Semiconductor Corporation SA26CH
- Part No.:
- SA26CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA26CH.pdf
- Description:
- 500W, 32.1V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,054
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Product details
Overview
SA26CH 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. It delivers AEC-Q101 qualification for automotive-grade surge protection in power supply rails and interface lines.
For engineers reviewing the SA26CH datasheet, SA26CH pinout, SA26CH application, or SA26CH equivalent, this page provides verified electrical parameters, clamping behavior under 10/1000μs transients, thermal derating curves, polarity marking guidance, and direct alternatives with documented VWM/VC/IPPM trade-offs.
Technical Context
The SA26CH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (28.9–35.3V at 1mA). Its low dynamic impedance enables rapid clamping to 45.4V at 11A, limiting energy dissipation during 10/1000μs surges per IEC 61000-4-5.
Designed for automotive and industrial environments, it features a maximum junction temperature of 175°C, RoHS-compliant halogen-free molding compound, and pure tin-plated leads meeting J-STD-002 solderability. Polarity is marked by a cathode band on the DO-15 body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; sets system overvoltage trip threshold. |
| VBR min/max | 28.9 V / 35.3 V @ 1 mA - Breakdown tolerance defines minimum clamping onset and worst-case turn-on margin. |
| VC @ IPPM | 45.4 V @ 11 A - Clamped voltage during 10/1000μs surge; determines protected IC's maximum stress level. |
| PPK | 500 W - Peak pulse power rating at TA = 25°C; derates linearly above 25°C per Fig.2. |
| TJ max | 175 °C - Maximum junction temperature; supports operation in under-hood automotive locations. |
| Package | DO-204AC (DO-15) - Standard axial-leaded through-hole package with cathode band marking; compatible with legacy PCB layouts. |
Pinout & Package
DO-204AC (DO-15) package with axial leads: anode (unmarked end) and cathode (banded end). Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events (IFSM = 70 A). |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 24V rail); initiates clamping when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements. |
| 500W surge capability | Withstands 10/1000μs transients up to 500W without degradation-meets ISO 7637-2 Pulse 1/2a/3a immunity levels. |
| Clamping voltage ≤45.4V | Limits downstream IC stress to safe levels during load dump or inductive kick events on 24V systems. |
| Reverse leakage <1μA @ VWM | Minimizes standby power loss and avoids false triggering in high-impedance sensing circuits. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 24V supply lines in engine control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between rail and ground to clamp surges exceeding 26V. Use Value: Limits peak voltage to 45.4V during 11A transients, preventing damage to MCU power inputs and CAN transceivers. | Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to field wiring EFT bursts. IC Role / Device Role / Timing Role: Standoff protector on 24V optocoupler input stage to absorb 10/1000μs fast transients. Use Value: Maintains signal integrity by clamping spikes before they reach isolation barriers, reducing false triggers and latch-up risk. |
| LED Driver Overvoltage Clamp | DC Motor Controller Flyback Suppression |
Use Scenario: Shielding constant-current LED drivers from voltage overshoot during hot-swap or dimming transitions. IC Role / Device Role / Timing Role: Parallel-connected TVS across output terminals to limit transient excursions beyond 26V. Use Value: Prevents LED string failure and driver IC latch-up by clamping to 45.4V within <1ps response time. | Use Scenario: Suppressing inductive kickback from brushed DC motors in automotive seat/mirror actuators. IC Role / Device Role / Timing Role: Unidirectional TVS across motor terminals to shunt flyback energy into ground. Use Value: Absorbs 500W surge energy without degradation, extending H-bridge MOSFET lifetime and reducing EMI. |
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); VC = 42.1V @ 9.5A; DO-214AC (SMA) surface-mount package. | Requires PCB rework for SMT layout; better suited for space-constrained consumer boards than automotive through-hole designs. | Select SMAJ26A only if board real estate is limited and 400W surge margin suffices. |
| P6KE27A | Higher VWM (27V), same DO-15 package; PPK = 600W; VC = 43.0V @ 13.9A; no AEC-Q101 qualification. | Acceptable for industrial use where automotive qualification is not required; tighter VBR tolerance (27.4–29.1V) improves clamping consistency. | Choose P6KE27A for cost-sensitive non-automotive applications needing higher surge headroom. |
Compared with SMAJ26A and P6KE27A, SA26CH uniquely combines AEC-Q101 qualification, 500W DO-15 form factor, and 26V VWM with guaranteed clamping at 45.4V-making it optimal for automotive 24V rail protection where reliability and legacy through-hole compatibility are mandatory.
Availability
SA26CH is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC input conditioning, and 24V LED driver protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SA26CH 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 high-reliability transient suppression in harsh environments, with AEC-Q101 variants like SA26CH targeting automotive power distribution and interface protection.
FAQ
What is the clamping voltage of SA26CH and how is it measured?
The SA26CH has a maximum clamping voltage (VC) of 45.4 V at 11 A peak pulse current (IPPM), tested under the standard 10/1000 μs double-exponential surge waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and reflects the actual voltage seen by downstream circuitry during transient events. The SA26CH datasheet specifies VC under these exact conditions, ensuring predictable protection behavior in 24V automotive systems.
Is SA26CH unidirectional or bidirectional, and how is polarity identified?
The SA26CH is a unidirectional TVS diode, designed to clamp only reverse-voltage transients on positive-rail applications. Polarity is marked by a cathode band on the DO-204AC (DO-15) package body-this band must be connected toward the protected line (e.g., +24V), while the unmarked end connects to ground. Bidirectional variants in the SA series carry a "C" or "CA" suffix (e.g., SA26C), which SA26CH does not have.
Does SA26CH meet automotive qualification standards?
Yes, SA26CH is explicitly AEC-Q101 qualified, as confirmed by its "H" suffix in the ordering code and documentation in TSC's SA Series datasheet Version L2105. This qualification covers stress tests including high-temperature operating life, temperature cycling, and mechanical shock-validating its suitability for under-hood and chassis-mounted automotive electronics where reliability is critical. SA26CH is not a generic industrial variant; the "H" denotes full automotive compliance.
What is the maximum junction temperature and thermal derating behavior of SA26CH?
The SA26CH has a maximum junction temperature (TJ) of 175°C and follows linear derating of peak pulse power above 25°C ambient, per Figure 2 in the official datasheet. At 75°C ambient, its 500W PPK rating reduces to approximately 350W; at 125°C, it drops to ~175W. This derating curve ensures safe operation in high-temperature environments such as engine compartments, provided PCB copper pad area and airflow meet TSC's recommended layout guidelines.
How does SA26CH compare to SA26A in terms of breakdown voltage and application suitability?
The SA26CH has a VBR range of 28.9–35.3 V at 1 mA, while SA26A specifies 28.9–31.9 V-indicating tighter breakdown tolerance for SA26A. However, SA26CH is AEC-Q101 qualified ("H" suffix) and intended for automotive use, whereas SA26A lacks that qualification. Both share identical VWM (26 V), VC (45.4 V), and package (DO-15), but SA26CH is the only one validated for automotive stress profiles and long-term reliability in vehicular systems.
SA26CH 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:
- -
- Bidirectional Channels:
- 1
- 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)
SA26CH FAQ
1.How can I place an order for SA26CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA26CH 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 SA26CH reliable?
The price and inventory of SA26CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA26CH is usually 5 days.
3.What payment methods are accepted for SA26CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA26CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA26CH?
SA26CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA26CH 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 SA26CH?
For technical support, including SA26CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA26CH requirements.
6.How does Aetrix verify that SA26CH is sourced from the original manufacturer or authorized distributors?
All SA26CH 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 SA26CH meets industry standards.
7.What is the process for return or replacement of SA26CH?
All SA26CH units undergo pre-shipment inspection (PSI). If there is an issue with SA26CH, 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 SA26CH part is unused and in its original packaging.
Return procedure for SA26CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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