4N26S(TB)-V Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N26S(TB)-V is a single-channel optoisolator manufactured by Everlight Electronics Co Ltd, featuring transistor output with base connection and 5000Vrms isolation voltage. This component is classified as Active status and is currently in stock with 716 units available. The device is designed for applications requiring galvanic isolation between input and output circuits in surface mount configurations.

Substitute parts are identified based on functional equivalence within the optoisolator category, maintaining compatibility across key electrical parameters including isolation voltage, current transfer ratio, output type, and package configuration. Substitution becomes necessary when the primary part reaches end-of-life status, supply constraints occur, or alternative sourcing is required for cost optimization or inventory management.

Substiute Parts

4N26S(TB)-V

Everlight Electronics Co LtdIn Stock: 8144N26S(TB)-V Datasheet

Current PartRFQ

4N26S

Fairchild SemiconductorIn Stock: 90534N26S Datasheet

SimilarRFQ

4N26SM

Fairchild SemiconductorIn Stock: 221734N26SM Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 4N26S(TB)-V are identified based on strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

• Single-channel configuration (Number of Channels = 1)
• Transistor output with base connection
• Surface mount technology with 6-SMD, Gull Wing package
• DC input type
• Isolation voltage within acceptable operational range (minimum 4170Vrms)
• Current transfer ratio minimum of 20% @ 10mA
• Vce saturation maximum of 500mV
• ROHS3 compliance

Identified Substitute Parts:

1. 4N26S (Fairchild Semiconductor) - Isolation voltage 5300Vrms, Active component availability
2. 4N26SM (Fairchild Semiconductor) - Isolation voltage 4170Vrms, Active product status with higher inventory

Both substitute parts maintain functional equivalence through matching output type, package configuration, and core electrical specifications. Differences in isolation voltage, maximum output voltage, forward voltage, and operating temperature ranges are documented in the parameter comparison table for engineering evaluation.

Parameter Comparison

Engineering Selection Recommendations

4N26S (Fairchild Semiconductor): This substitute maintains higher isolation voltage (5300Vrms) compared to the primary part (5000Vrms), providing enhanced isolation margin. However, this part carries Obsolete product status, indicating discontinued manufacturing and potential long-term supply unavailability. The maximum output voltage is reduced to 30V versus 80V on the primary part. Current DC forward rating increases to 100mA. Turn-on and turn-off times are faster at 2µs. Operating temperature range remains -55°C to 100°C. ROHS3 compliance is maintained. Selection of this part should account for obsolescence risk and reduced maximum output voltage capability.

4N26SM (Fairchild Semiconductor): This substitute maintains Active product status with the highest available inventory (22100 units), ensuring supply continuity. Isolation voltage is reduced to 4170Vrms, which remains above minimum substitution threshold but provides lower isolation margin than the primary part. Maximum output voltage is 30V. Current DC forward rating matches the primary part at 60mA. Turn-on and turn-off times are faster at 2µs. Operating temperature range is narrower at -40°C to 100°C, reducing low-temperature capability by 15°C. ROHS3 compliance is maintained. This part is recommended for applications where supply security and active product status are prioritized over maximum isolation voltage and low-temperature performance.

Both substitute parts maintain functional equivalence through matching channel count, output type, package configuration, and core saturation characteristics. Selection between substitutes depends on application requirements for isolation voltage margin, maximum output voltage, operating temperature range, and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 4N26S(TB)-V be directly replaced with the 4N26S from Fairchild Semiconductor?

A: Direct replacement is functionally possible based on matching channel count, output type, and package configuration. However, the Fairchild 4N26S carries Obsolete product status, indicating discontinued manufacturing. The maximum output voltage is reduced from 80V to 30V, which may impact applications requiring higher output voltage capability. Verify application requirements before substitution.

Q: What is the primary difference between the 4N26S and 4N26SM substitutes?

A: The 4N26S (Fairchild) provides higher isolation voltage at 5300Vrms but is Obsolete. The 4N26SM (Fairchild) maintains Active product status with significantly higher inventory availability (22100 units) but operates at lower isolation voltage (4170Vrms) and narrower operating temperature range (-40°C to 100°C versus -55°C to 100°C). Both share identical maximum output voltage (30V) and current transfer ratio specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The primary part 4N26S(TB)-V and both identified substitutes (4N26S and 4N26SM) maintain ROHS3 compliance, ensuring compatibility with environmental and regulatory requirements.

Q: What packaging formats are available for these optoisolators?

A: The primary part 4N26S(TB)-V is supplied in SMD format. The 4N26S substitute is available in Tube packaging. The 4N26SM substitute is available in Bulk packaging. All three parts use identical 6-SMD, Gull Wing case configuration for surface mount assembly.

Q: How do the turn-on and turn-off times compare across these parts?

A: The primary part 4N26S(TB)-V specifies 3µs turn-on and 3µs turn-off time. Both Fairchild substitutes (4N26S and 4N26SM) offer faster switching at 2µs turn-on and 2µs turn-off time, providing improved response characteristics for time-sensitive applications.

Q: What is the minimum isolation voltage requirement for substitution?

A: Based on the provided specifications, the 4N26SM substitute operates at 4170Vrms isolation voltage, establishing the minimum threshold for functional equivalence within this product category. The primary part operates at 5000Vrms, and the 4N26S substitute at 5300Vrms. Applications requiring specific isolation voltage margins should verify compatibility with the selected substitute.

Q: Are there temperature range limitations when substituting these parts?

A: Yes. The primary part 4N26S(TB)-V operates from -55°C to 110°C. The 4N26S substitute operates from -55°C to 100°C (10°C reduction at upper limit). The 4N26SM substitute operates from -40°C to 100°C (15°C reduction at lower limit and 10°C reduction at upper limit). Applications requiring full -55°C to 110°C operation should verify substitute compatibility.