ILQ5-X009T Optoisolator Equivalent & Substitute Parts

Part Overview

The ILQ5-X009T is a 4-channel optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. This component provides 5300Vrms isolation voltage and is designed for applications requiring high-voltage galvanic isolation with DC input and transistor output configuration. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Active alternatives from Isocom Components and Lite-On Inc. are available to fulfill the same functional requirements.

Key Parameters

Parameter	ILQ5-X009T
Manufacturer	Vishay Semiconductor Opto Division
Product Status	Obsolete
Number of Channels	4
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	50% @ 10mA
Current Transfer Ratio (Max)	400% @ 10mA
Output Type	Transistor
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-40°C ~ 100°C
Package / Case	16-SMD, Gull Wing
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ILQ5-X009T is determined by the following critical parameters:

Isolation Voltage Matching: The main part operates at 5300Vrms isolation. Substitutes must maintain equivalent or superior isolation voltage ratings to preserve circuit safety margins.

Channel Configuration: All substitutes must provide 4-channel configuration to match the original pinout and functional density.

Output Type & Electrical Characteristics: Transistor output configuration with maximum output voltage of 70V and 50mA per-channel current capacity must be maintained.

Current Transfer Ratio Range: The 50% to 400% CTR range at specified test conditions defines the optical coupling efficiency and must be preserved.

Package Compatibility: 16-SMD Gull Wing surface mount package ensures mechanical and electrical compatibility with existing PCB layouts.

Compliance Standards: RoHS3 compliance and REACH unaffected status are mandatory for regulatory alignment.

Substitutes are grouped into two categories based on isolation voltage: parts matching the 5300Vrms specification (ILQ5XSM, ILQ5XSMT&R) and parts with lower isolation voltage (ILQ5SM, ILQ5SMT&R at 7.5Vpk, and LTV-846S at 5000Vrms). Selection depends on application isolation requirements.

Parameter Comparison

Parameter	ILQ5-X009T	ILQ5SM	ILQ5SMT&R	ILQ5XSM	ILQ5XSMT&R	LTV-846S
Manufacturer	Vishay	Isocom	Isocom	Isocom	Isocom	Lite-On
Product Status	Obsolete	Active	Active	Active	Active	Active
Number of Channels	4	4	4	4	4	4
Voltage - Isolation	5300Vrms	7.5Vpk	7.5Vpk	5300Vrms	5300Vrms	5000Vrms
Current Transfer Ratio (Min)	50% @ 10mA	50% @ 10mA	50% @ 10mA	50% @ 10mA	50% @ 10mA	50% @ 5mA
Current Transfer Ratio (Max)	400% @ 10mA	400% @ 10mA	400% @ 10mA	400% @ 10mA	400% @ 10mA	600% @ 5mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	70V	70V	70V	70V	70V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.25V	1.2V	1.2V	1.2V	1.2V	1.2V
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV	200mV
Operating Temperature	-40°C ~ 100°C	-25°C ~ 100°C	-25°C ~ 100°C	-25°C ~ 100°C	-25°C ~ 100°C	-30°C ~ 100°C
Package / Case	16-SMD, Gull Wing	16-SMD, Gull Wing	16-SMD, Gull Wing	16-SMD, Gull Wing	16-SMD, Gull Wing	16-SMD, Gull Wing
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	-	Tube	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Tube

Engineering Selection Recommendations

Primary Substitutes (Exact Isolation Voltage Match): ILQ5XSM and ILQ5XSMT&R maintain the 5300Vrms isolation specification of the original part. Both are manufactured by Isocom Components with active product status. Selection between tube (ILQ5XSM) and tape & reel (ILQ5XSMT&R) packaging depends on procurement and assembly requirements. These parts are recommended for applications where the 5300Vrms isolation rating is a design requirement.

Secondary Substitute (Lower Isolation Voltage): LTV-846S from Lite-On Inc. provides 5000Vrms isolation, which is 300Vrms lower than the original specification. This part offers improved Vce saturation (200mV vs. 400mV) and higher maximum output voltage (80V vs. 70V). LTV-846S is suitable for applications where the lower isolation voltage is acceptable and improved saturation characteristics provide design benefits.

Not Recommended for Direct Substitution: ILQ5SM and ILQ5SMT&R operate at 7.5Vpk isolation voltage, which is significantly lower than the 5300Vrms requirement. These parts are suitable only for applications with substantially reduced isolation voltage requirements and should not be used as direct replacements for the ILQ5-X009T without circuit redesign.

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original part.

Frequently Asked Questions (FAQ)

Q: Can ILQ5SM be used as a direct replacement for ILQ5-X009T?

A: No. ILQ5SM operates at 7.5Vpk isolation voltage compared to the ILQ5-X009T's 5300Vrms specification. This represents a significant reduction in isolation capability and is not suitable for direct substitution unless the application circuit has been redesigned for lower isolation requirements.

Q: What is the difference between ILQ5XSM and ILQ5XSMT&R?

A: Both parts are electrically identical with 5300Vrms isolation voltage and identical electrical characteristics. The difference is packaging: ILQ5XSM is supplied in tube packaging, while ILQ5XSMT&R is supplied in tape & reel format. Selection depends on assembly line requirements and procurement preferences.

Q: Is LTV-846S a suitable replacement for ILQ5-X009T?

A: LTV-846S is a functional substitute with 5000Vrms isolation voltage, which is 300Vrms lower than the original part. It provides superior Vce saturation (200mV vs. 400mV) and higher maximum output voltage (80V vs. 70V). Substitution is acceptable if the application isolation voltage requirement does not exceed 5000Vrms and the improved saturation characteristics are compatible with circuit design.

Q: Do all substitute parts maintain the same operating temperature range?

A: No. The ILQ5-X009T operates from -40°C to 100°C, while all Isocom and Lite-On substitutes operate from -25°C to -30°C minimum. Applications requiring operation below -25°C cannot use these substitutes without circuit redesign or thermal management modifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts (ILQ5XSM, ILQ5XSMT&R, and LTV-846S) are RoHS3 compliant and REACH unaffected, matching the regulatory status of the original ILQ5-X009T.

Q: What is the significance of Current Transfer Ratio specifications?

A: Current Transfer Ratio defines the optical coupling efficiency between input and output. The ILQ5-X009T specifies 50% to 400% CTR at 10mA input current. All primary substitutes maintain this range. LTV-846S specifies CTR at 5mA input current with a higher maximum of 600%, indicating different test conditions but comparable coupling efficiency for typical applications.

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