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onsemi SA26A
- Part No.:
- SA26A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA26A.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:6,320
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Product details
Overview
SA26A from Fairchild Semiconductor is a unidirectional 500 W transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power lines and signal interfaces. It features a 26 V reverse stand-off voltage (VRWM), 28.9–31.9 V breakdown voltage (VBR) at 1.0 mA, 42.1 V clamping voltage at 11.9 A peak pulse current (IPPM), and operates up to +175 °C junction temperature.
For engineers reviewing the SA26A datasheet, pinout, applications, or equivalent options, this device serves as a robust, glass-passivated, fast-response surge protector for industrial power supplies, automotive body electronics, and telecom interface circuits where low clamping voltage and sub-1 ns response are critical.
Technical Context
The SA26A employs a planar passivated silicon junction optimized for high-energy transient suppression on the standardized 10/1000 μs waveform. Its unidirectional configuration provides asymmetric conduction-low-leakage blocking in reverse bias until VBR is exceeded, then rapid avalanche clamping with <1.0 ps response from 0 V to breakdown.
Thermal performance is defined by a 1.0 W steady-state power dissipation at 75 °C ambient with 0.375" lead length, and it supports non-repetitive surge currents up to 70 A (8.3 ms half-sine). The device is rated for storage from –65 °C to +175 °C and operates reliably at TJ = +175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 500 W - sustains single high-energy surges per IEC 61000-4-5 Level 4 without failure |
| Reverse Stand-off Voltage (VRWM) | 26 V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 28.9–31.9 V @ 1.0 mA - precise avalanche onset range ensures predictable clamping threshold |
| Clamping Voltage (VC) | 42.1 V @ 11.9 A IPPM - limits downstream voltage stress during surge events |
| Reverse Leakage (IR) | <1.0 μA @ 26 V - negligible standby power loss and minimal interference in high-impedance circuits |
| Junction Temperature Range | –65 °C to +175 °C - enables deployment in under-hood automotive and industrial environments |
Pinout & Package
SA26A is housed in a DO-15 axial package with cathode indicated by a color band. The device has two terminals: anode and cathode. Lead length is standardized at 0.375" for thermal derating compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to ground or low-side reference in unidirectional TVS configuration | Provides return path during clamping; must be routed with low-inductance connection to minimize voltage overshoot |
| Cathode | Protected line connection; carries transient current into the device during overvoltage events | Marked with color band; connects to the line being protected (e.g., 24 V rail or RS-485 bus) |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable long-term leakage performance and resistance to humidity-induced degradation |
| Fast response time | <1.0 ps from 0 V to breakdown - clamps transients before sensitive downstream ICs experience overstress |
| Low incremental surge resistance | Minimizes VC rise under high IPPM, improving clamping efficiency versus competing TVS devices |
| 500 W peak pulse rating | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive applications |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Modules |
|---|---|
Use Scenario: Protecting 24 V DC input channels against load dump and inductive switching surges in programmable logic controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly at connector entry point ahead of ESD diodes and regulator inputs. Use Value: Limits transient voltage to ≤42.1 V, preventing damage to microcontrollers and analog front-ends rated for 36 V absolute maximum. |
Use Scenario: Safeguarding LIN bus transceivers and window motor drivers exposed to battery voltage spikes during alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS mounted between supply rail and chassis ground to absorb energy from ISO 7637-2 Pulse 5a/b events. Use Value: Withstands 500 W surges while maintaining <1.0 μA leakage at 26 V, avoiding false wake-up or quiescent current violations. |
| Telecom Power Feeds | DC Power Supply Inputs |
Use Scenario: Surge protection on -48 V DC telecom power distribution boards subject to lightning-induced surges. IC Role / Device Role / Timing Role: Front-end clamping device on rectified output of AC/DC converters feeding remote radio units. Use Value: Clamps 11.9 A pulses to 42.1 V, preserving upstream fuse coordination and downstream DC/DC converter reliability. |
Use Scenario: Input-stage protection for 24 V industrial SMPS units operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: First-line defense against EFT/burst and surge transients coupled onto mains-derived DC rails. Use Value: Operates continuously at +175 °C junction temperature, enabling compact placement near hot components without thermal derating penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26A | DO-214AA package; 600 W peak pulse rating; 43.0 V clamping at 13.9 A; higher thermal mass but larger footprint | Better suited for PCB-mounted designs requiring higher surge margin and automated assembly | Select SMBJ26A when board space allows and 600 W rating is required; SA26A preferred for axial through-hole legacy systems |
| P6KE27A | DO-15 package; 600 W rating; 43.0 V clamping at 13.9 A; wider VBR tolerance (30.0–33.0 V); higher IR (5.0 μA max @ 27 V) | Higher leakage may impact ultra-low-power sensor nodes; broader VBR reduces precision in tight-margin designs | Choose P6KE27A only if cost sensitivity outweighs leakage and clamping precision requirements |
Compared with SMBJ26A and P6KE27A, the SA26A delivers tighter VBR tolerance (28.9–31.9 V), lower leakage (<1.0 μA), and optimized thermal derating for axial-lead mounting-making it ideal for space-constrained, thermally demanding, and precision-clamping applications.
Availability
SA26A is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and telecom power feed applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete solutions before its acquisition by ON Semiconductor in 2016. Its legacy TVS portfolio remains widely deployed in industrial and automotive systems.
The SA26A belongs to Fairchild's SAxxA series of 500 W unidirectional TVS diodes, engineered specifically for robust, cost-effective overvoltage protection in harsh-environment DC power and interface circuits.
FAQ
What is the clamping voltage of the SA26A at its rated peak pulse current?
The SA26A exhibits a maximum clamping voltage (VC) of 42.1 V when subjected to its specified peak pulse current (IPPM) of 11.9 A on the 10/1000 μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events. The SA26A maintains this clamping performance consistently across its qualified temperature range and lifetime.
Is the SA26A suitable for bidirectional transient protection?
No, the SA26A is a unidirectional TVS diode and is not rated for bidirectional protection. Devices with a "C" suffix (e.g., SA26CA) are the bidirectional variants in the same family. Using SA26A in AC or bipolar signal paths will result in forward conduction during negative excursions, potentially causing failure or incorrect clamping behavior. Always select SA26CA for bidirectional applications.
What is the maximum operating junction temperature for the SA26A?
The SA26A has a maximum operating junction temperature (TJ) of +175 °C, as specified in Fairchild's official datasheet. This rating enables reliable operation in high-temperature environments such as engine compartments, industrial enclosures, and power supply heatsinks. Derating curves confirm usable power dissipation up to this limit when mounted with 0.375" lead length.
How does the SA26A compare to the P6KE26A in terms of leakage current?
The SA26A specifies a maximum reverse leakage current (IR) of less than 1.0 μA at its 26 V VRWM, whereas the P6KE26A allows up to 5.0 μA under the same conditions. This four-fold lower leakage makes the SA26A preferable in battery-powered or high-impedance sensing applications where standby current and signal integrity are critical design constraints.
Can the SA26A be used in place of the SA26CA for surge protection on a DC power rail?
Yes - the SA26A is appropriate for unidirectional DC power rail protection (e.g., +24 V to ground), where polarity is fixed and only positive-going transients require suppression. The SA26CA is required only when the protected line experiences reversible polarity or AC-coupled signals. Substituting SA26A for SA26CA in a DC system preserves full surge capability while reducing cost and simplifying layout.
SA26A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 11.9A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 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.
SA26A Tags
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onsemi
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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