ILQ5 Optoisolator Equivalent & Substitute Parts

Part Overview

The ILQ5 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 signal isolation in 16-DIP through-hole packaging. The ILQ5 is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations. Substitute parts must maintain compatibility across isolation voltage, channel configuration, output type, and package specifications.

Key Parameters

Parameter	Value
Number of Channels	4
Voltage - Isolation	5300Vrms
Output Type	Transistor
Current Transfer Ratio (Min)	50% @ 10mA
Current Transfer Ratio (Max)	400% @ 10mA
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Package / Case	16-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Operating Temperature	-40°C ~ 100°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ILQ5 optoisolator is determined by the following critical parameters:

Primary Compatibility Criteria:

4-channel configuration
Transistor output topology
16-DIP through-hole package (0.300", 7.62mm)
Isolation voltage rating of 5000Vrms or higher
Current transfer ratio minimum of 50% at specified test current
Maximum output voltage of 70V or greater
Output current capability of 50mA per channel
Vce saturation rating of 400mV or lower

Acceptable Variation Ranges:

Isolation voltage: 5000Vrms to 5300Vrms
Current transfer ratio test conditions: 5mA to 10mA
Rise/fall time specifications: within typical switching application requirements
Operating temperature: -40°C to -25°C minimum acceptable
Vce saturation: 200mV to 400mV acceptable

The ILQ5X (Isocom Components 2004 LTD) and LTV-846 (Lite-On Inc.) meet these criteria and are identified as functional equivalents.

Parameter Comparison

Parameter	ILQ5 (Vishay)	ILQ5X (Isocom)	LTV-846 (Lite-On)
Manufacturer	Vishay Semiconductor Opto Division	Isocom Components 2004 LTD	Lite-On Inc.
Product Status	Obsolete	Active	Active
Number of Channels	4	4	4
Voltage - Isolation	5300Vrms	5300Vrms	5000Vrms
Current Transfer Ratio (Min)	50% @ 10mA	50% @ 10mA	50% @ 5mA
Current Transfer Ratio (Max)	400% @ 10mA	400% @ 10mA	600% @ 5mA
Turn On / Turn Off Time (Typ)	1.1µs, 2.5µs	Not specified	Not specified
Rise / Fall Time (Typ)	2.6µs, 2.2µs	2µs, 2µs	4µs, 3µs
Voltage - Output (Max)	70V	70V	80V
Current - Output / Channel	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.25V	1.2V	1.2V
Current - DC Forward (If) (Max)	60mA	50mA	50mA
Vce Saturation (Max)	400mV	400mV	200mV
Operating Temperature	-40°C ~ 100°C	-25°C ~ 100°C	-30°C ~ 100°C
Package / Case	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

ILQ5X (Isocom Components 2004 LTD): The ILQ5X is an active product with identical isolation voltage (5300Vrms) and current transfer ratio specifications to the ILQ5. This part provides the closest electrical match and is recommended as the primary substitute for direct replacement applications. The ILQ5X maintains the same 16-DIP package footprint and through-hole mounting configuration. Operating temperature range is -25°C to 100°C, which covers most industrial applications but does not extend to the -40°C minimum of the original ILQ5. ROHS3 compliance and unlimited moisture sensitivity level are maintained.

LTV-846 (Lite-On Inc.): The LTV-846 is an active product with 5000Vrms isolation voltage, which is 300Vrms lower than the ILQ5 specification. This part is suitable for applications where the lower isolation voltage is acceptable. The LTV-846 offers improved Vce saturation performance (200mV maximum versus 400mV) and higher maximum output voltage (80V versus 70V). Rise and fall times are slower (4µs and 3µs respectively) compared to the ILQ5. Operating temperature range is -30°C to 100°C. ROHS3 compliance and unlimited moisture sensitivity level are maintained. The LTV-846 is recommended for applications where isolation voltage requirements are 5000Vrms or lower and improved saturation characteristics are beneficial.

Compliance and Regulatory Status: All substitute parts maintain ROHS3 compliance, REACH unaffected status, and unlimited moisture sensitivity level (MSL 1), ensuring compatibility with current manufacturing and environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can the ILQ5X directly replace the ILQ5 in all applications?

A: The ILQ5X is electrically compatible with the ILQ5 for most applications. Both parts share identical isolation voltage (5300Vrms), channel count (4), current transfer ratio specifications, and 16-DIP package configuration. The primary difference is the operating temperature minimum: ILQ5X operates from -25°C while ILQ5 operates from -40°C. Applications requiring operation below -25°C require evaluation of the LTV-846 or retention of original ILQ5 stock.

Q: What is the key difference between the ILQ5X and LTV-846?

A: The primary difference is isolation voltage rating. The ILQ5X maintains 5300Vrms isolation matching the original ILQ5, while the LTV-846 provides 5000Vrms isolation. The LTV-846 offers superior Vce saturation performance (200mV versus 400mV) and higher maximum output voltage (80V versus 70V). Selection depends on whether the application requires 5300Vrms isolation or can operate with 5000Vrms isolation.

Q: Are all substitute parts available in the same 16-DIP package?

A: Yes. The ILQ5, ILQ5X, and LTV-846 are all packaged in 16-DIP (0.300", 7.62mm) through-hole configuration. Pin-to-pin compatibility is maintained, allowing direct socket substitution without PCB redesign.

Q: Do the substitute parts meet current environmental and compliance standards?

A: Yes. Both the ILQ5X and LTV-846 are ROHS3 compliant, REACH unaffected, and carry unlimited moisture sensitivity level (MSL 1) ratings, meeting current manufacturing and environmental requirements.

Q: What is the current transfer ratio test condition difference between parts?

A: The ILQ5 and ILQ5X specify current transfer ratio at 10mA input current, while the LTV-846 specifies it at 5mA input current. Both maintain a 50% minimum ratio, but the LTV-846 achieves a higher maximum ratio (600% versus 400%) due to the lower test current. Applications should verify that the specified test conditions align with actual operating input currents.

Q: Which substitute is recommended for new designs?

A: For new designs requiring 5300Vrms isolation, the ILQ5X is recommended as it maintains all electrical specifications of the original ILQ5 and is an active product. For applications where 5000Vrms isolation is acceptable, the LTV-846 offers improved saturation characteristics and higher output voltage capability.

Q: Can the LTV-846 be used in applications originally designed for the ILQ5?

A: The LTV-846 is suitable for applications where the 5000Vrms isolation voltage meets system requirements. The lower isolation voltage, improved saturation performance, and higher output voltage make it compatible with most ILQ5 applications. However, applications with specific 5300Vrms isolation requirements must use the ILQ5X or original ILQ5 stock.

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