IL203-X009T Optoisolator Equivalent & Substitute Parts

Part Overview

The IL203-X009T is a single-channel optoisolator transistor with base output manufactured by Vishay Semiconductor Opto Division. This component provides 5300Vrms isolation with a current transfer ratio of 225–450% at 10mA input. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Active alternatives from Isocom Components maintain electrical compatibility while offering current product status and improved availability.

Key Parameters

Parameter	IL203-X009T
Manufacturer	Vishay Semiconductor Opto Division
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	225% @ 10mA
Current Transfer Ratio (Max)	450% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	70V
Voltage - Forward (Vf) (Typ)	1.2V
Current - DC Forward (If) (Max)	60 mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	6-SMD, Gull Wing
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the IL203-X009T is determined by strict alignment of the following electrical and mechanical parameters:

Isolation Voltage: 5300Vrms (mandatory match)
Number of Channels: 1 (mandatory match)
Output Type: Transistor with Base (mandatory match)
Voltage - Output (Max): 70V (mandatory match)
Voltage - Forward (Vf) (Typ): 1.2V (mandatory match)
Current - DC Forward (If) (Max): 60 mA (mandatory match)
Vce Saturation (Max): 400mV (mandatory match)
Operating Temperature: -55°C ~ 100°C (mandatory match)
Mounting Type: Surface Mount (mandatory match)
Package / Case: 6-SMD, Gull Wing (mandatory match)

The CNY17 series from Isocom Components meets all mandatory electrical and mechanical parameters. Substitutes are grouped by current transfer ratio performance bands, which determine circuit behavior but do not prevent functional substitution within the same isolation and output specifications.

Parameter Comparison

Parameter	IL203-X009T	CNY17-1SMT&R	CNY17-1XSM	CNY17-1XSMT&R	CNY17-2SMT&R	CNY17-2XSM	CNY17-2XSMT&R	CNY17-3SMT&R	CNY17-3XSM	CNY17-3XSMT&R	CNY17-4SMT&R
Manufacturer	Vishay	Isocom	Isocom	Isocom	Isocom	Isocom	Isocom	Isocom	Isocom	Isocom	Isocom
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
Voltage - Isolation	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms
Current Transfer Ratio (Min)	225% @ 10mA	40% @ 10mA	40% @ 10mA	40% @ 10mA	63% @ 10mA	63% @ 10mA	63% @ 10mA	100% @ 10mA	100% @ 10mA	100% @ 10mA	160% @ 10mA
Current Transfer Ratio (Max)	450% @ 10mA	80% @ 10mA	80% @ 10mA	80% @ 10mA	125% @ 10mA	125% @ 10mA	125% @ 10mA	200% @ 10mA	200% @ 10mA	200% @ 10mA	320% @ 10mA
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	70V	70V	70V	70V	70V	70V	70V	70V	70V	70V	70V
Current - Output / Channel	—	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-DIP (0.300", 7.62mm)	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging	—	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Tape & Reel (TR)
Inventory Status	2083 Pcs New Original In Stock	768 Pcs New Original In Stock	1088 Pcs New Original In Stock	992 Pcs New Original In Stock	944 Pcs New Original In Stock	2900 Pcs New Original In Stock	1024 Pcs New Original In Stock	755 Pcs New Original In Stock	2069 Pcs New Original In Stock	1800 Pcs New Original In Stock	722 Pcs New Original In Stock

Engineering Selection Recommendations

All CNY17 series optoisolators from Isocom Components are direct functional equivalents to the IL203-X009T. Selection among substitute parts depends on circuit requirements and packaging preferences:

For Surface Mount 6-SMD Gull Wing applications: CNY17-1SMT&R, CNY17-1XSM, CNY17-1XSMT&R, CNY17-2SMT&R, CNY17-2XSM, CNY17-2XSMT&R, CNY17-3SMT&R, CNY17-3XSM, CNY17-3XSMT&R, and CNY17-4SMT&R all maintain the required package footprint and mounting type.

For Through Hole 6-DIP applications: CNY17-2XSMT&R provides the alternative package option while maintaining all electrical specifications.

Current Transfer Ratio Selection: The IL203-X009T operates at 225–450% CTR. The CNY17-3 series (100–200% CTR) and CNY17-4 series (160–320% CTR) provide the closest performance match. The CNY17-3XSMT&R and CNY17-4SMT&R are recommended for applications requiring CTR performance nearest to the original specification.

All substitute parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's compliance profile. Product status is active for all CNY17 variants, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can CNY17-1 series parts replace IL203-X009T in all applications?

A: CNY17-1 series parts meet all mandatory electrical and mechanical parameters. However, the current transfer ratio is significantly lower (40–80% vs. 225–450%). Substitution is valid only if circuit design accommodates the lower CTR specification. Input drive current and output load impedance must be re-evaluated.

Q: What is the difference between SMT&R, XSM, and XSMT&R packaging variants?

A: SMT&R indicates Tape & Reel packaging for automated assembly. XSM indicates Tube packaging for manual handling. XSMT&R indicates Tape & Reel packaging with extended specifications. All maintain identical electrical performance and 6-SMD Gull Wing footprint except CNY17-2XSMT&R, which uses 6-DIP Through Hole package.

Q: Is the CNY17-2XSMT&R suitable for surface mount PCB designs?

A: No. CNY17-2XSMT&R uses 6-DIP Through Hole package and is not compatible with surface mount assembly. For surface mount applications, select CNY17-2SMT&R, CNY17-2XSM, or other SMD variants.

Q: Do all CNY17 substitutes maintain the same isolation voltage?

A: Yes. All CNY17 series parts provide 5300Vrms isolation, matching the IL203-X009T specification exactly.

Q: Which CNY17 variant offers the best current transfer ratio match to IL203-X009T?

A: CNY17-3XSMT&R (100–200% CTR) and CNY17-4SMT&R (160–320% CTR) provide the closest performance to the original 225–450% specification. CNY17-4SMT&R offers the highest CTR range and is recommended for applications requiring maximum gain.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All CNY17 series optoisolators are ROHS3 compliant and REACH unaffected, matching the original part's environmental compliance.

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