4N24TX Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N24TX is a 1000VDC optoisolator transistor with base output manufactured by TT Electronics/Optek Technology in a TO-78-6 metal can package. This component provides galvanic isolation for single-channel DC applications with a 1 channel configuration and 50mA output current capability. The 4N24TX is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

4N24TX

TT Electronics/Optek TechnologyIn Stock: 9744N24TX Datasheet

Current PartRFQ

JANTX4N24

TT Electronics/Optek TechnologyIn Stock: 1201JANTX4N24 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 4N24TX is determined by strict equivalence across the following critical parameters:

• Voltage isolation rating: 1000VDC minimum
• Number of channels: 1 channel configuration
• Output type: Transistor with base
• Package type: TO-78-6 metal can
• Current transfer ratio: 100% @ 10mA minimum
• Output current capability: 50mA per channel
• Mounting type: Through hole

The JANTX4N24 qualifies as a direct substitute based on matching all isolation voltage, channel count, output type, package configuration, and current specifications. Compliance improvements and active product status make this the primary alternative for the obsolete 4N24TX.

Parameter Comparison

Engineering Selection Recommendations

The JANTX4N24 is the qualified substitute for the obsolete 4N24TX. Both components share identical isolation voltage, channel configuration, output type, and current specifications. The JANTX4N24 offers the following advantages:

• Active product status ensures continued availability and manufacturing support
• ROHS3 compliance meets modern environmental and regulatory requirements
• Increased maximum output voltage rating (40V vs 35V) provides additional design margin
• Identical package footprint and pinout enable direct board-level replacement
• Reduced minimum operating temperature (-55°C vs -65°C) is acceptable for most industrial applications

The JANTX4N24 is suitable for direct substitution in applications where the 4N24TX was previously specified, provided the operating temperature minimum of -55°C meets system requirements.

Frequently Asked Questions (FAQ)

Q: Can the JANTX4N24 be used as a direct replacement for the 4N24TX?

A: Yes. Both components share identical isolation voltage (1000VDC), channel count (1), output type (transistor with base), package configuration (TO-78-6), current transfer ratio (100% @ 10mA), and output current rating (50mA). The JANTX4N24 has a higher maximum output voltage (40V vs 35V) and active product status.

Q: What is the difference in operating temperature range?

A: The 4N24TX operates from -65°C to 125°C, while the JANTX4N24 operates from -55°C to 125°C. The JANTX4N24 has a higher minimum operating temperature by 10°C. Verify that your application does not require operation below -55°C before substitution.

Q: Are there any compliance differences between these parts?

A: The 4N24TX is RoHS non-compliant, while the JANTX4N24 is ROHS3 compliant. Both are REACH unaffected and classified as EAR99 for export control purposes.

Q: Is the TO-78-6 package pinout identical between both parts?

A: Yes. Both components use the TO-78-6 metal can package with identical pinout and mounting type (through hole), enabling direct board-level substitution without layout modifications.

Q: What is the significance of the JANTX designation?

A: JANTX indicates JAN (Joint Army-Navy) qualified components with enhanced reliability screening and testing. The JANTX4N24 meets military-grade quality standards while maintaining functional equivalence to the 4N24TX.