CNY172W Optoisolator Equivalent & Substitute Parts

Part Overview

The CNY172W is a single-channel optoisolator transistor with base output manufactured by onsemi, rated for 5300Vrms isolation voltage in a 6-DIP through-hole package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. The CNY172W serves applications requiring galvanic isolation with transistor output capability, commonly found in power supply control circuits, motor drive interfaces, and industrial control systems.

Key Parameters

Parameter	CNY172W Value
Manufacturer	onsemi
Product Status	Obsolete
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	63% @ 10mA
Current Transfer Ratio (Max)	125% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Vce Saturation (Max)	300mV
Operating Temperature	-55°C ~ 100°C
Package / Case	6-DIP (0.400", 10.16mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the CNY172W is determined by the following critical parameters:

Primary Compatibility Criteria:

Single channel configuration (Number of Channels = 1)
Transistor output with base connection
6-DIP through-hole package format
Isolation voltage rating of 5000Vrms or higher
Operating temperature range of -55°C to 100°C minimum
DC input type
Maximum output voltage of 70V

Secondary Compatibility Criteria:

Current Transfer Ratio range overlap or compatibility with application requirements
Output current capability (minimum 50mA required)
Vce saturation characteristics suitable for switching applications

Substitute parts are grouped into two categories based on isolation voltage: those rated at 5300Vrms (matching the main part) and those rated at 5000Vrms (lower but acceptable for most applications). All listed substitutes maintain the same package footprint and pin configuration, enabling direct board-level replacement.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ 10mA	CTR Max @ 10mA	Output Current	Vce Sat (Max)	Product Status	Package
CNY172W	onsemi	5300Vrms	63%	125%	50mA	300mV	Obsolete	6-DIP (0.400")
CNY17-1-W00E	Broadcom Limited	5000Vrms	40%	80%	150mA	300mV	Active	6-DIP (0.400")
CNY17-1-W60E	Broadcom Limited	5000Vrms	40%	80%	150mA	300mV	Active	6-DIP (0.400")
CNY17-1G	Isocom Components 2004 LTD	5300Vrms	40%	80%	50mA	400mV	Active	6-DIP (0.400")
CNY17-1M	Lite-On Inc.	5000Vrms	40%	80%	150mA	300mV	Active	6-DIP (0.400")
CNY17-1XG	Isocom Components 2004 LTD	5300Vrms	40%	80%	50mA	400mV	Active	6-DIP (0.300")
CNY17-2-W00E	Broadcom Limited	5000Vrms	63%	125%	150mA	300mV	Active	6-DIP (0.400")
CNY17-2-W60E	Broadcom Limited	5000Vrms	63%	125%	150mA	300mV	Active	6-DIP (0.400")
CNY17-2G	Isocom Components 2004 LTD	5300Vrms	63%	125%	50mA	400mV	Active	6-DIP (0.400")
CNY17-2X006	Vishay Semiconductor Opto Division	5000Vrms	63%	125%	50mA	400mV	Active	6-DIP (0.400")
CNY17-2XG	Isocom Components 2004 LTD	5300Vrms	63%	125%	50mA	400mV	Active	6-DIP (0.300")

Engineering Selection Recommendations

All listed substitute parts are classified as active products with current manufacturing support, eliminating obsolescence risk associated with the CNY172W. Selection among substitutes depends on specific application requirements:

For direct footprint compatibility (0.400" DIP spacing): CNY17-2G, CNY17-2-W00E, CNY17-2-W60E, and CNY17-1G provide matching package dimensions. CNY17-2G and CNY17-2XG match the CNY172W current transfer ratio specification (63%-125%), ensuring equivalent switching characteristics.

For enhanced output current capability: CNY17-1-W00E, CNY17-1-W60E, CNY17-1M, CNY17-2-W00E, and CNY17-2-W60E deliver 150mA output current versus the CNY172W's 50mA, providing design margin for higher load applications.

For isolation voltage matching: CNY17-1G, CNY17-1XG, CNY17-2G, and CNY17-2XG maintain the 5300Vrms isolation rating. CNY17-2G and CNY17-2XG additionally preserve the current transfer ratio specification.

For RoHS and regulatory compliance: All active substitutes carry RoHS3 compliance certification. Broadcom, Lite-On, Isocom, and Vishay parts all maintain REACH Unaffected status and EAR99 export classification matching the original part.

Frequently Asked Questions (FAQ)

Q: Can CNY17-1-W00E replace CNY172W in existing designs? A: Yes, with circuit evaluation. CNY17-1-W00E maintains 5000Vrms isolation, 70V maximum output voltage, and 300mV Vce saturation. The lower current transfer ratio (40%-80% versus 63%-125%) and higher output current (150mA versus 50mA) require verification that input drive levels and load impedances remain within acceptable operating margins.

Q: What is the difference between CNY17-1XG and CNY17-1G? A: Both are manufactured by Isocom with identical electrical specifications and 5300Vrms isolation. The primary difference is package pitch: CNY17-1XG uses 0.300" DIP spacing while CNY17-1G uses 0.400" spacing. Board layout compatibility determines which variant applies.

Q: Are CNY17-2-W00E and CNY17-2-W60E interchangeable? A: Yes. Both are Broadcom products with identical electrical parameters, 5000Vrms isolation, 63%-125% current transfer ratio, and 150mA output current. The suffix designations reflect packaging or date code variations without affecting functional performance.

Q: Does lower current transfer ratio affect circuit operation? A: Lower CTR (40%-80% in some substitutes versus 63%-125% in CNY172W) requires higher input current to achieve the same output current. Circuit input drive capability must be confirmed adequate before substitution.

Q: Which substitute best matches CNY172W specifications? A: CNY17-2G provides the closest match: identical 5300Vrms isolation, matching 63%-125% current transfer ratio, 50mA output current, and 6-DIP (0.400") package. The 400mV Vce saturation is slightly higher than the original 300mV specification.

Q: Can I use 5000Vrms parts where 5300Vrms is specified? A: Application-dependent. If the design margin accommodates 5000Vrms isolation, Broadcom and Lite-On variants are acceptable. If 5300Vrms isolation is a hard requirement, Isocom and Vishay parts maintain this specification.

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