CNY172S Optoisolator Equivalent & Substitute Parts

Part Overview

The CNY172S is a single-channel optoisolator with transistor output and base connection, manufactured by onsemi. This component provides 5300Vrms isolation voltage in a 6-SMD surface mount package. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain compatibility across isolation voltage, output current capability, switching characteristics, and thermal operating range to ensure functional equivalence in circuit designs.

Key Parameters

Parameter	CNY172S Value
Isolation Voltage	5300Vrms
Number of Channels	1
Output Type	Transistor with Base
Current Transfer Ratio (Min)	63% @ 10mA
Current Transfer Ratio (Max)	125% @ 10mA
Turn On / Turn Off Time	2µs, 3µs
Rise / Fall Time	1µs, 2µs
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Vce Saturation (Max)	300mV
Operating Temperature	-55°C ~ 100°C
Package / Case	6-SMD, Gull Wing
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution logic for the CNY172S is based on the following critical parameters:

Primary Compatibility Criteria:

Isolation voltage rating (minimum 5000Vrms acceptable; 5300Vrms preferred for margin)
Single-channel configuration with transistor output and base connection
6-SMD surface mount package with gull wing leads
Output voltage rating of 70V
Output current capability of 50mA or greater
Operating temperature range encompassing -55°C to 100°C
Current transfer ratio performance at 10mA input

Substitution Categories:

Direct Substitutes (5300Vrms isolation): Parts maintaining the exact 5300Vrms isolation specification with equivalent or superior electrical characteristics. These include CNY17-1XSM (Isocom) and CNY17-1SMT&R (Isocom).

Functional Equivalents (5000Vrms isolation): Parts with 5000Vrms isolation voltage, which is acceptable for applications not requiring the full 5300Vrms margin. These include CNY17-1-300E and CNY17-1-500E (Broadcom), CNY17-1S and CNY17-1S-TA (Lite-On), CNY17-1X007T and CNY17-1X009T (Vishay).

Lower-Tier Substitute (4170Vrms isolation): CNY172SM (Fairchild Semiconductor) operates at reduced isolation voltage and is suitable only for applications with lower isolation requirements.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ 10mA	CTR Max @ 10mA	Turn On/Off Time	Output Current	Vce Sat (Max)	Temp Range	Product Status
CNY172S	onsemi	5300Vrms	63%	125%	2µs, 3µs	50mA	300mV	-55°C ~ 100°C	Obsolete
CNY172SM	Fairchild Semiconductor	4170Vrms	63%	125%	2µs, 3µs	50mA	400mV	-40°C ~ 100°C	Active
CNY17-1-300E	Broadcom Limited	5000Vrms	40%	80%	—	150mA	300mV	-55°C ~ 100°C	Active
CNY17-1-500E	Broadcom Limited	5000Vrms	40%	80%	—	150mA	300mV	-55°C ~ 100°C	Active
CNY17-1S	Lite-On Inc.	5000Vrms	40%	80%	—	150mA	300mV	-55°C ~ 100°C	Active
CNY17-1S-TA	Lite-On Inc.	5000Vrms	40%	80%	—	150mA	300mV	-55°C ~ 100°C	Active
CNY17-1S-TA1	Lite-On Inc.	5000Vrms	40%	80%	—	150mA	300mV	-55°C ~ 100°C	Active
CNY17-1SMT&R	Isocom Components 2004 LTD	5300Vrms	40%	80%	3µs, 18µs	50mA	400mV	-55°C ~ 100°C	Active
CNY17-1X007T	Vishay Semiconductor Opto Division	5000Vrms	40%	80%	3µs, 2.3µs	50mA	400mV	-55°C ~ 110°C	Active
CNY17-1X009T	Vishay Semiconductor Opto Division	5000Vrms	40%	80%	3µs, 2.3µs	50mA	400mV	-55°C ~ 110°C	Active
CNY17-1XSM	Isocom Components 2004 LTD	5300Vrms	40%	80%	3µs, 2.3µs	50mA	400mV	-55°C ~ 100°C	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (5300Vrms Isolation):

CNY17-1XSM (Isocom Components) and CNY17-1SMT&R (Isocom Components) maintain the 5300Vrms isolation specification of the CNY172S. Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating. CNY17-1XSM is available in tube packaging; CNY17-1SMT&R is supplied in tape and reel format. These parts are electrically compatible with the original CNY172S design without circuit modification.

Tier 2 - Functional Equivalents (5000Vrms Isolation):

CNY17-1-300E, CNY17-1-500E (Broadcom Limited), CNY17-1S, CNY17-1S-TA, CNY17-1S-TA1 (Lite-On Inc.), CNY17-1X007T, and CNY17-1X009T (Vishay Semiconductor Opto Division) operate at 5000Vrms isolation. All are active products with ROHS3 compliance. These parts are suitable for applications where the 300Vrms isolation margin reduction is acceptable. Broadcom and Lite-On variants offer increased output current capability (150mA vs. 50mA), providing design flexibility. Vishay variants extend the operating temperature range to 110°C.

Tier 3 - Reduced Isolation Substitute (4170Vrms Isolation):

CNY172SM (Fairchild Semiconductor) operates at 4170Vrms isolation and is suitable only for applications with lower isolation voltage requirements. This part is active and ROHS3 compliant but has a reduced operating temperature minimum of -40°C.

All substitute parts maintain the 6-SMD gull wing surface mount package, single-channel configuration, and transistor output with base connection required for CNY172S replacement.

Frequently Asked Questions (FAQ)

Q: Can CNY17-1-300E or CNY17-1-500E replace CNY172S directly?

A: Yes, functionally. Both Broadcom parts maintain 5000Vrms isolation, single-channel transistor output with base, 6-SMD package, and -55°C to 100°C operating range. The 300Vrms reduction in isolation voltage is acceptable for most applications. Both parts are active products with superior output current capability (150mA vs. 50mA).

Q: What is the difference between CNY17-1S, CNY17-1S-TA, and CNY17-1S-TA1?

A: All three Lite-On variants are electrically identical with 5000Vrms isolation and identical electrical specifications. The suffix designates packaging and tape configuration. CNY17-1S is supplied in tube; CNY17-1S-TA and CNY17-1S-TA1 are supplied in tape and reel with different reel specifications. Select based on assembly process requirements.

Q: Why does CNY172SM have lower isolation voltage?

A: CNY172SM (Fairchild Semiconductor) is rated at 4170Vrms, which is 1130Vrms lower than CNY172S. This part is suitable only for applications where isolation voltage requirements are lower. The reduced operating temperature minimum (-40°C vs. -55°C) also limits its use in extreme cold environments.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original CNY172S is obsolete and compliance status is not specified. All active alternatives meet current environmental compliance standards.

Q: What is the significance of packaging differences (Tube, Tape & Reel, Cut Tape)?

A: Packaging affects assembly process compatibility. Tube packaging is suitable for manual or low-volume assembly. Tape and reel (TR) format is required for automated pick-and-place assembly. Cut tape (CT) with Digi-Reel is an intermediate option. Select based on manufacturing process requirements.

Q: Can I use CNY17-1X007T or CNY17-1X009T in place of CNY172S?

A: Yes. Both Vishay parts maintain 5000Vrms isolation, 50mA output current, and -55°C to 100°C operating range (extended to 110°C). The primary difference is packaging: CNY17-1X007T is cut tape; CNY17-1X009T is tape and reel. Both are active products suitable for CNY172S replacement.

Q: What is the difference between CNY17-1SMT&R and CNY17-1XSM?

A: Both Isocom parts maintain 5300Vrms isolation matching the original CNY172S. CNY17-1SMT&R is supplied in tape and reel format; CNY17-1XSM is supplied in tube. Electrical specifications are equivalent. Select based on assembly process requirements.

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