4N24UTX Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N24UTX is an optoisolator transistor with base output manufactured by TT Electronics/Optek Technology. It provides 1000VDC isolation with a single channel configuration in a 6-LCC surface mount package. The device features a transistor output with accessible base terminal, enabling flexible circuit design for isolated switching applications.

The 4N24UTX is classified as obsolete. Identifying compatible substitute parts is necessary to maintain design continuity and ensure component availability for production and maintenance applications.

Substiute Parts

4N24UTX

TT Electronics/Optek TechnologyIn Stock: 10504N24UTX Datasheet

Current PartRFQ

4N24U

TT Electronics/Optek TechnologyIn Stock: 12094N24U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 4N24UTX is determined by the following critical parameters:

• Isolation Voltage: 1000VDC minimum
• Number of Channels: 1 channel configuration
• Output Type: Transistor with Base terminal
• Package Type: 6-LCC surface mount (6.22x4.32mm)
• Current Transfer Ratio: 100% @ 10mA minimum
• Input Type: DC
• Rise / Fall Time: 20µs typical
• Output Voltage Rating: 35V maximum
• Forward Voltage: 1.3V maximum
• Forward Current: 40 mA maximum
• Saturation Voltage: 300mV maximum

The 4N24U meets all substitution criteria as a direct replacement. Both devices share identical electrical specifications, package geometry, and functional characteristics. The primary distinction is product status: 4N24U is active production, while 4N24UTX is obsolete.

Parameter Comparison

Engineering Selection Recommendations

The 4N24U is the direct substitute for the obsolete 4N24UTX. Both components are manufactured by TT Electronics/Optek Technology and maintain identical electrical and mechanical specifications across all critical parameters.

The 4N24U offers the advantage of active product status, ensuring ongoing availability and manufacturing support. Both devices carry ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements.

The 4N24U features an extended operating temperature range of -65°C to 125°C compared to the 4N24UTX range of -55°C to 125°C, providing additional thermal margin in low-temperature applications.

Pin-to-pin compatibility and package geometry are identical, enabling direct board-level substitution without design modification.

Frequently Asked Questions (FAQ)

Q: Can the 4N24U directly replace the 4N24UTX without circuit modification?

A: Yes. The 4N24U is a direct pin-for-pin and functional equivalent. No circuit changes are required for substitution.

Q: What is the primary difference between these two parts?

A: The 4N24UTX is obsolete, while the 4N24U is in active production. The 4N24U also provides a lower minimum operating temperature of -65°C versus -55°C for the 4N24UTX.

Q: Are the package dimensions identical?

A: Yes. Both devices use the 6-LCC surface mount package with dimensions of 6.22x4.32mm. PCB footprints are identical.

Q: Do both parts meet current compliance standards?

A: Yes. Both the 4N24UTX and 4N24U are ROHS3 compliant and REACH unaffected.

Q: What is the isolation voltage rating for these optoisolators?

A: Both devices provide 1000VDC isolation voltage, suitable for high-voltage isolation applications.

Q: Are there any electrical performance differences between the two parts?

A: No. Current transfer ratio, rise/fall times, output voltage ratings, forward voltage, forward current, and saturation voltage specifications are identical.