4N23ATX Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N23ATX is a 1000VDC optoisolator transistor with base output in TO-78-6 metal can packaging, manufactured by TT Electronics/Optek Technology. This component features a single isolation channel with 60% minimum current transfer ratio at 10mA input current and 50mA maximum output current per channel. The 4N23ATX is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	4N23ATX
Manufacturer	TT Electronics/Optek Technology
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	1000VDC
Current Transfer Ratio (Min)	60% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	35V
Current - Output / Channel	50mA
Vce Saturation (Max)	300mV
Operating Temperature	-65°C ~ 125°C
Package / Case	TO-78-6 Metal Can
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 4N23ATX is determined by the following critical electrical and mechanical parameters:

Isolation Voltage: 1000VDC minimum requirement
Number of Channels: Single channel configuration
Output Type: Transistor with base output
Current Transfer Ratio: 60% minimum at 10mA input
Maximum Output Current: 50mA per channel
Package Type: TO-78-6 metal can through-hole mounting
Vce Saturation: 300mV maximum
Input Type: DC

The JANTX4N23A qualifies as a direct substitute based on matching all critical electrical parameters and identical package configuration. The JANTX4N23A maintains the same isolation voltage, channel count, output type, current transfer ratio specification, and through-hole TO-78-6 packaging required for 4N23ATX replacement applications.

Parameter Comparison

Parameter	4N23ATX	JANTX4N23A
Manufacturer	TT Electronics/Optek Technology	TT Electronics/Optek Technology
Number of Channels	1	1
Voltage - Isolation	1000VDC	1000VDC
Current Transfer Ratio (Min)	60% @ 10mA	60% @ 10mA
Output Type	Transistor with Base	Transistor with Base
Voltage - Output (Max)	35V	40V
Current - Output / Channel	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.3V (Max)	1.5V (Max)
Vce Saturation (Max)	300mV	300mV
Operating Temperature	-65°C ~ 125°C	-55°C ~ 125°C
Package / Case	TO-78-6 Metal Can	TO-78-6 Metal Can
Mounting Type	Through Hole	Through Hole
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The JANTX4N23A is the qualified substitute for the obsolete 4N23ATX. Both components are manufactured by TT Electronics/Optek Technology and share identical electrical specifications for isolation voltage, channel configuration, current transfer ratio, and output current capacity. The JANTX4N23A offers the additional advantage of active product status, ensuring continued availability and supply chain reliability.

The JANTX4N23A achieves ROHS3 compliance, whereas the 4N23ATX is RoHS non-compliant. This compliance improvement supports modern manufacturing and environmental regulatory requirements. The operating temperature range of the JANTX4N23A (-55°C ~ 125°C) is narrower at the lower bound compared to the 4N23ATX (-65°C ~ 125°C); applications requiring operation below -55°C must retain the original 4N23ATX specification.

The JANTX4N23A maximum output voltage rating of 40V exceeds the 4N23ATX specification of 35V, providing additional design margin. Forward voltage specifications differ slightly (1.5V maximum for JANTX4N23A versus 1.3V maximum for 4N23ATX), which may require circuit verification in applications with tight input current budgets.

Frequently Asked Questions (FAQ)

Q: Can JANTX4N23A directly replace 4N23ATX in existing designs?

A: Yes, the JANTX4N23A is electrically and mechanically compatible with the 4N23ATX. Both components feature identical isolation voltage (1000VDC), single-channel configuration, 60% minimum current transfer ratio, 50mA output current rating, and TO-78-6 through-hole packaging. Verify that your application does not require operation below -55°C, as the JANTX4N23A operating temperature minimum is -55°C compared to -65°C for the 4N23ATX.

Q: What are the key differences between 4N23ATX and JANTX4N23A?

A: The primary differences are product status and compliance certifications. The JANTX4N23A is active production with ROHS3 compliance, while the 4N23ATX is obsolete and RoHS non-compliant. The JANTX4N23A provides 40V maximum output voltage versus 35V for the 4N23ATX, and forward voltage is specified at 1.5V maximum versus 1.3V maximum for the 4N23ATX.

Q: Are there any temperature range limitations when substituting?

A: The JANTX4N23A operates from -55°C to 125°C, while the 4N23ATX operates from -65°C to 125°C. If your application requires operation below -55°C, the 4N23ATX specification must be retained. For all other temperature ranges within -55°C to 125°C, the JANTX4N23A is fully compatible.

Q: Does the packaging remain identical?

A: Yes, both the 4N23ATX and JANTX4N23A use TO-78-6 metal can through-hole packaging. No PCB layout modifications are required for substitution.

Q: What is the significance of RoHS compliance for this substitution?

A: The JANTX4N23A achieves ROHS3 compliance, meeting current environmental and manufacturing standards. The 4N23ATX is RoHS non-compliant. For new designs and manufacturing environments with RoHS requirements, the JANTX4N23A is the appropriate selection.

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