4N47 Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N47 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 50% minimum current transfer ratio at 1mA input and 50mA maximum output current capability. The 4N47 is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Voltage - Isolation	1000VDC
Number of Channels	1
Current Transfer Ratio (Min)	50% @ 1mA
Output Type	Transistor with Base
Voltage - Output (Max)	40V
Current - Output / Channel	50mA
Rise / Fall Time (Typ)	20µs, 20µs
Vce Saturation (Max)	300mV
Operating Temperature	-55°C ~ 125°C
Package / Case	TO-78-6 Metal Can
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the 4N47 is determined by strict equivalence across the following critical parameters:

Voltage isolation rating: 1000VDC
Single channel configuration
Transistor with base output topology
TO-78-6 metal can package
Through hole mounting
Operating temperature range: -55°C ~ 125°C
Output voltage and current specifications: 40V maximum, 50mA per channel
Saturation voltage: 300mV maximum

Substitute parts must maintain identical isolation voltage, package form factor, output topology, and thermal operating range. Current transfer ratio variations are permitted within the scope of parametric equivalence when all other electrical and mechanical specifications align.

Parameter Comparison

Parameter	4N47	4N48	JANTX4N47	JANTXV4N47
Manufacturer	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology
Product Status	Obsolete	Active	Active	Active
Voltage - Isolation	1000VDC	1000VDC	1000VDC	1000VDC
Number of Channels	1	1	1	1
Current Transfer Ratio (Min)	50% @ 1mA	100% @ 1mA	50% @ 1mA	50% @ 1mA
Current Transfer Ratio (Max)	—	500% @ 1mA	—	—
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	40V	40V	40V	40V
Current - Output / Channel	50mA	50mA	50mA	50mA
Vce Saturation (Max)	300mV	300mV	300mV	300mV
Rise / Fall Time (Typ)	20µs, 20µs	20µs, 20µs	20µs, 20µs (Max)	20µs, 20µs (Max)
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	TO-78-6 Metal Can	TO-78-6 Metal Can	TO-78-6 Metal Can	TO-78-6 Metal Can
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 4N47 is obsolete and no longer in active production. Three active alternatives are available:

4N48 is the manufacturer-recommended direct upgrade. It maintains all electrical and mechanical specifications of the 4N47 while offering enhanced current transfer ratio performance (100% to 500% @ 1mA versus 50% minimum). The 4N48 achieves ROHS3 compliance and is actively manufactured with 697 units in stock.

JANTX4N47 and JANTXV4N47 are parametric equivalents that preserve the original 4N47 current transfer ratio specification (50% @ 1mA) while providing active product status and ROHS3 compliance. Both variants are available in bulk packaging with 700 and 851 units in stock respectively. JANTX4N47 carries the JANTX military qualification designation, while JANTXV4N47 carries the JANTXV designation, indicating enhanced screening and reliability testing.

All three substitutes maintain identical isolation voltage, package form factor, output topology, thermal range, and output current specifications. Selection between alternatives depends on current transfer ratio requirements and qualification level needs.

Frequently Asked Questions (FAQ)

Q: Can the 4N48 directly replace the 4N47 in existing designs?

A: Yes. The 4N48 maintains all critical electrical parameters: 1000VDC isolation, 40V maximum output voltage, 50mA output current, 300mV saturation voltage, and -55°C to 125°C operating range. The enhanced current transfer ratio (100% to 500%) is a performance improvement over the 4N47 (50% minimum) and does not create compatibility issues in standard applications.

Q: What is the difference between JANTX4N47 and JANTXV4N47?

A: Both parts are parametric equivalents of the 4N47 with identical electrical specifications. JANTX4N47 carries JANTX military qualification, while JANTXV4N47 carries JANTXV qualification, indicating additional screening and reliability testing. Both are ROHS3 compliant and actively produced.

Q: Are all substitutes available in the same TO-78-6 package?

A: Yes. All substitute parts use the TO-78-6 metal can package with through hole mounting, ensuring mechanical and thermal compatibility with existing PCB designs and socket configurations.

Q: Does the 4N48 higher current transfer ratio affect circuit operation?

A: The 4N48 current transfer ratio range (100% to 500% @ 1mA) encompasses the 4N47 specification (50% @ 1mA). Higher current transfer ratio indicates improved optical coupling efficiency and does not degrade circuit performance in applications designed for the 4N47.

Q: What compliance certifications apply to the substitute parts?

A: All three active substitutes (4N48, JANTX4N47, JANTXV4N47) are ROHS3 compliant and REACH unaffected. The original 4N47 is RoHS non-compliant. JANTX and JANTXV designations indicate military-grade qualification and screening.

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