4N26S-TA Equivalent & Substitute Parts

Part Overview

The 4N26S-TA is an optoisolator transistor with base output manufactured by Lite-On Inc., designed for 1500Vrms isolation applications. This component features a single channel configuration with 6-SMD surface mount packaging in Tape & Reel format. The device is currently in active production status with 1099 units available in inventory. Alternative models are identified to support supply chain flexibility, design optimization, and application-specific parameter requirements.

Substiute Parts

4N26S-TA

Lite-On Inc.In Stock: 11164N26S-TA Datasheet

Current PartRFQ

4N26SM

Fairchild SemiconductorIn Stock: 221734N26SM Datasheet

MFR RecommendedRFQ

4N26SR2M

onsemiIn Stock: 224384N26SR2M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 4N26S-TA are identified based on the following critical parameters that determine functional compatibility:

Core Compatibility Criteria:

• Number of Channels: 1 (all substitutes match)
• Output Type: Transistor with Base (all substitutes match)
• Package / Case: 6-SMD, Gull Wing (all substitutes match)
• Mounting Type: Surface Mount (all substitutes match)
• Input Type: DC (all substitutes match)
• Voltage - Output (Max): 30V (all substitutes match)
• Vce Saturation (Max): 500mV (all substitutes match)

Substitution Logic: The 4N26S-TA can be substituted with 4N26SM and 4N26SR2M. Both substitute parts maintain identical mechanical packaging, electrical output characteristics, and functional topology. The substitute parts provide enhanced isolation voltage ratings (4170Vrms versus 1500Vrms), improved switching performance (2µs versus 3µs rise/fall times), and equivalent current transfer ratios. Operating temperature ranges differ slightly, with substitutes rated to -40°C minimum versus -55°C for the main part.

Parameter Comparison

Engineering Selection Recommendations

4N26SM (Fairchild Semiconductor): This substitute provides higher isolation voltage (4170Vrms) within the same 6-SMD package footprint. The part is active in production with 22,100 units in inventory. Selection is appropriate for applications requiring enhanced isolation performance without mechanical redesign. Forward voltage is marginally lower (1.18V versus 1.2V), and maximum forward current is reduced to 60mA. Packaging is bulk format rather than Tape & Reel.

4N26SR2M (onsemi): This substitute offers the highest isolation voltage (4170Vrms) with improved switching performance (2µs rise/fall time versus 3µs). The part is ROHS3 compliant and REACH unaffected, with 22,400 units in inventory. Tape & Reel packaging matches the original format. Operating temperature minimum is -40°C, which may require evaluation for extended low-temperature applications. This part is recommended where faster switching response is beneficial.

Selection Basis: All substitute parts maintain active production status and comply with applicable regulatory standards. The 4N26SR2M is preferred where packaging format and switching speed are design priorities. The 4N26SM is suitable where isolation voltage enhancement is the primary requirement and bulk packaging is acceptable.

Frequently Asked Questions (FAQ)

Q: Can 4N26SM and 4N26SR2M be used interchangeably with 4N26S-TA? A: Both parts are functionally compatible as direct substitutes. They maintain identical package geometry (6-SMD, Gull Wing), output topology (transistor with base), and maximum output voltage (30V). Differences in isolation voltage, switching speed, and operating temperature range must be evaluated against specific application requirements.

Q: What is the primary difference between the two substitute parts? A: The 4N26SR2M provides faster switching performance (2µs rise/fall time) compared to 4N26SM, which does not specify rise/fall time. Both offer identical isolation voltage (4170Vrms) and current transfer ratio (20% @ 10mA). The 4N26SR2M is supplied in Tape & Reel format matching the original part; 4N26SM is supplied in bulk packaging.

Q: Does the higher isolation voltage of substitute parts affect circuit design? A: The substitute parts provide higher isolation voltage (4170Vrms versus 1500Vrms) without changing electrical output characteristics or package footprint. Applications designed for 1500Vrms isolation will operate within the rated specifications of the higher-voltage substitutes. No circuit redesign is required for isolation voltage compatibility.

Q: Are there operating temperature considerations when substituting? A: The 4N26S-TA operates from -55°C to 100°C. Both substitutes operate from -40°C to 100°C. Applications requiring operation below -40°C must retain the original 4N26S-TA. Applications within the -40°C to 100°C range are compatible with either substitute.

Q: How do forward current specifications affect substitution? A: The 4N26S-TA specifies maximum forward current of 80mA; both substitutes specify 60mA. Circuits designed for 80mA input current must be evaluated to confirm operation within the 60mA limit of substitute parts. Forward voltage is comparable across all parts (1.2V versus 1.18V).

Q: What packaging format should be selected for production assembly? A: The 4N26S-TA and 4N26SR2M are supplied in Tape & Reel format suitable for automated pick-and-place assembly. The 4N26SM is supplied in bulk packaging, which may require manual handling or alternative feeding methods depending on assembly equipment capabilities.