IL1 Optoisolator Transistor with Base Output - Equivalent & Substitute Parts

Part Overview

The IL1 is a 6-DIP optoisolator with transistor output and base connection, manufactured by Vishay Semiconductor Opto Division. This component provides galvanic isolation at 5300Vrms with a single channel configuration suitable for DC input applications. The IL1 is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	IL1 (Vishay)
Voltage - Isolation	5300Vrms
Number of Channels	1
Current Transfer Ratio (Min)	20% @ 10mA
Current Transfer Ratio (Max)	300% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	50V
Current - Output / Channel	50mA
Vce Saturation (Max)	250mV (Typ)
Package / Case	6-DIP (0.300", 7.62mm)
Operating Temperature	-40°C ~ 100°C
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the IL1 optoisolator is determined by the following critical parameters:

Package compatibility: 6-DIP (0.300", 7.62mm) form factor for direct board-level replacement
Output configuration: Transistor with base output for circuit topology compatibility
Isolation voltage: Minimum 5000Vrms to maintain safety and regulatory compliance
Single channel: One isolated channel configuration
DC input type: Direct current input signal compatibility
Current output capability: Minimum 50mA per channel
Operating temperature range: Support for -40°C minimum operation

Substitute parts are grouped into two categories based on isolation voltage alignment:

Category A - Full Isolation Voltage Match (5300Vrms): IL1X from Isocom Components provides identical isolation voltage specification.

Category B - Reduced Isolation Voltage (5000Vrms): 4N25 from Texas Instruments and CNY17-3-000E from Broadcom Limited operate at 5000Vrms, representing a 300Vrms reduction from the original specification.

Parameter Comparison

Parameter	IL1 (Vishay)	IL1X (Isocom)	4N25 (TI)	CNY17-3-000E (Broadcom)	IL1 (Isocom)
Voltage - Isolation	5300Vrms	5300Vrms	5000Vrms	5000Vrms	7.5Vpk
Number of Channels	1	1	1	1	1
Current Transfer Ratio (Min)	20% @ 10mA	20% @ 10mA	20% @ 10mA	100% @ 10mA	20% @ 10mA
Current Transfer Ratio (Max)	300% @ 10mA	300% @ 10mA	Not specified	200% @ 10mA	300% @ 10mA
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	50V	50V	70V	70V	50V
Current - Output / Channel	50mA	50mA	50mA	150mA	50mA
Vce Saturation (Max)	250mV (Typ)	400mV	500mV	300mV	400mV
Package / Case	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)
Operating Temperature	-40°C ~ 100°C	-25°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-25°C ~ 100°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

IL1X (Isocom Components) is the primary substitute for the obsolete Vishay IL1. This part maintains identical isolation voltage specification (5300Vrms), matching current transfer ratio range (20-300% @ 10mA), and equivalent output current capability (50mA). IL1X is ROHS3 compliant and carries active product status, ensuring long-term availability and supply chain stability.

4N25 (Texas Instruments) provides an active alternative with reduced isolation voltage (5000Vrms versus 5300Vrms). This part is suitable for applications where the lower isolation specification meets system requirements. The 4N25 operates across an extended temperature range (-55°C to 100°C) but is RoHS non-compliant, which may impact regulatory compliance in certain markets.

CNY17-3-000E (Broadcom Limited) operates at 5000Vrms isolation voltage with enhanced output current capability (150mA versus 50mA). This part is ROHS3 compliant and active. The higher current transfer ratio minimum (100% @ 10mA) and increased output current capacity provide design flexibility for applications requiring higher drive capability.

IL1 (Isocom Components) shares the same base product number but operates at significantly reduced isolation voltage (7.5Vpk). This part is not suitable as a direct substitute for high-voltage isolation applications.

Frequently Asked Questions (FAQ)

Q: Can the 4N25 directly replace the obsolete Vishay IL1?

A: The 4N25 is pin-compatible and functionally equivalent in package and output configuration. However, the isolation voltage is reduced from 5300Vrms to 5000Vrms. Selection depends on whether the application circuit requires the full 5300Vrms isolation specification or can operate within the 5000Vrms rating.

Q: What is the primary difference between IL1X and the original Vishay IL1?

A: IL1X maintains the identical 5300Vrms isolation voltage and current transfer ratio specifications as the Vishay IL1. The primary difference is manufacturer (Isocom versus Vishay) and product status (active versus obsolete). IL1X is the recommended direct replacement.

Q: Does the CNY17-3-000E offer any advantages over IL1X?

A: CNY17-3-000E provides higher output current capability (150mA versus 50mA) and a higher minimum current transfer ratio (100% versus 20%). These characteristics may benefit applications requiring increased drive current. However, isolation voltage remains at 5000Vrms rather than 5300Vrms.

Q: Are all substitute parts available in the same 6-DIP package?

A: Yes. All substitute parts listed use the 6-DIP (0.300", 7.62mm) package configuration, enabling direct board-level replacement without layout modification.

Q: What compliance considerations apply to substitute selection?

A: IL1X and CNY17-3-000E are ROHS3 compliant. The 4N25 is RoHS non-compliant. Applications subject to RoHS regulations should prioritize IL1X or CNY17-3-000E. All parts are EAR99 classified and REACH unaffected or compliant.

Q: Can the IL1 (Isocom) with 7.5Vpk isolation be used as a substitute?

A: No. The IL1 (Isocom) operates at 7.5Vpk isolation voltage, which is substantially lower than the 5300Vrms specification of the original Vishay IL1. This part is not suitable for applications requiring high-voltage galvanic isolation.

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