4N22TX Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N22TX 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 DC input signals with a single transistor output channel. The 4N22TX is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

4N22TX

TT Electronics/Optek TechnologyIn Stock: 9994N22TX Datasheet

Current PartRFQ

JANTX4N22

TT Electronics/Optek TechnologyIn Stock: 823JANTX4N22 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 4N22TX is determined by the following critical parameters:

• Isolation Voltage: 1000VDC minimum requirement
• Output Configuration: Transistor with base output
• Package Type: TO-78-6 metal can for mechanical and thermal compatibility
• Channel Count: Single channel
• Output Voltage Rating: Maximum 35V or higher
• Output Current: 50mA per channel
• Current Transfer Ratio: Minimum 25% @ 10mA
• Saturation Voltage: 300mV maximum

The JANTX4N22 meets all substitution criteria as a direct equivalent with enhanced specifications and active product status.

Parameter Comparison

Engineering Selection Recommendations

The JANTX4N22 is the qualified substitute for the 4N22TX based on the following factors:

Electrical Compatibility: The JANTX4N22 maintains all critical electrical parameters including 1000VDC isolation voltage, 25% minimum current transfer ratio, 50mA output current, and 300mV saturation voltage. The increased maximum output voltage (40V vs. 35V) and slightly extended rise/fall time (20µs vs. 15µs) represent enhanced or equivalent performance margins.

Mechanical Compatibility: Both parts use identical TO-78-6 metal can packaging and through-hole mounting, ensuring direct socket compatibility in existing PCB designs.

Product Status and Compliance: The JANTX4N22 is an active product with ROHS3 compliance, addressing regulatory requirements for new designs and long-term availability. The 4N22TX obsolete status necessitates transition to an active equivalent.

Temperature Range Consideration: The JANTX4N22 operates from -55°C to 125°C, compared to the 4N22TX range of -65°C to 125°C. Applications requiring operation below -55°C require design review.

Frequently Asked Questions (FAQ)

Q: Can the JANTX4N22 directly replace the 4N22TX in existing designs?

A: Yes. Both parts share identical TO-78-6 packaging, isolation voltage, output configuration, and critical electrical parameters. Pin-for-pin compatibility is maintained.

Q: What are the key differences between these parts?

A: The JANTX4N22 offers higher maximum output voltage (40V vs. 35V), slightly longer rise/fall times (20µs vs. 15µs), a narrower operating temperature range (-55°C to 125°C vs. -65°C to 125°C), and ROHS3 compliance versus non-compliance of the 4N22TX.

Q: Is the JANTX4N22 suitable for applications requiring -65°C operation?

A: No. The JANTX4N22 minimum operating temperature is -55°C. Applications requiring -65°C operation require alternative component selection or design modification.

Q: Are there any package or mounting differences?

A: No. Both parts use TO-78-6 metal can packaging with through-hole mounting. PCB layout modifications are not required.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates the JANTX4N22 meets current environmental and regulatory standards for electronic components, making it suitable for new product designs and markets with RoHS requirements.

Q: How do the current transfer ratios compare?

A: Both parts specify a minimum current transfer ratio of 25% @ 10mA, ensuring equivalent optical coupling efficiency and signal isolation performance.