CNY174TM Optoisolator Equivalent & Substitute Parts

Part Overview

The CNY174TM is a single-channel optoisolator with transistor output and base connection, rated for 4170Vrms isolation voltage. Manufactured by onsemi in a 6-DIP through-hole package, this component is classified as obsolete. Due to its discontinued status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute options maintain core functionality while offering improved availability and active product support.

Key Parameters

Parameter	CNY174TM Value
Isolation Voltage	4170Vrms
Number of Channels	1
Output Type	Transistor with Base
Current Transfer Ratio (Min)	160% @ 10mA
Current Transfer Ratio (Max)	320% @ 10mA
Output Voltage (Max)	70V
Output Current / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature Range	-40°C to 100°C
Package / Case	6-DIP (0.400", 10.16mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the CNY174TM is determined by the following critical parameters:

Isolation Voltage: Minimum 4170Vrms required for direct replacement
Output Type: Must be transistor with base configuration
Package / Case: 6-DIP through-hole form factor
Number of Channels: Single channel only
Current Transfer Ratio Range: Determines input-to-output signal transfer characteristics
Output Current Capability: Minimum 50mA per channel
Operating Temperature Range: Must encompass -40°C to 100°C or broader

Substitute parts are categorized into two groups:

Parametric Equivalent (Direct Replacement):

CNY174TVM (Fairchild Semiconductor): Identical electrical specifications and isolation voltage (4170Vrms)

Similar Substitutes (Higher Isolation Voltage, Active Status):

CNY17-1-W00E, CNY17-1-W60E, CNY17-1G, CNY17-1M, CNY17-1XG (5000Vrms to 5300Vrms isolation)
CNY17-2-W00E, CNY17-2-W60E, CNY17-2G, CNY17-2M (5000Vrms isolation with higher CTR)

All substitutes maintain 6-DIP through-hole packaging and single-channel transistor output configuration.

Parameter Comparison

Parameter	CNY174TM	CNY174TVM	CNY17-1-W00E	CNY17-1-W60E	CNY17-1G	CNY17-1M	CNY17-1XG	CNY17-2-W00E	CNY17-2-W60E	CNY17-2G	CNY17-2M
Manufacturer	onsemi	Fairchild Semiconductor	Broadcom Limited	Broadcom Limited	Isocom Components 2004 LTD	Lite-On Inc.	Isocom Components 2004 LTD	Broadcom Limited	Broadcom Limited	Isocom Components 2004 LTD	Lite-On Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
Isolation Voltage	4170Vrms	4170Vrms	5000Vrms	5000Vrms	5300Vrms	5000Vrms	5300Vrms	5000Vrms	5000Vrms	5300Vrms	5000Vrms
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
CTR Min @ 10mA	160%	160%	40%	40%	40%	40%	40%	63%	63%	63%	63%
CTR Max @ 10mA	320%	320%	80%	80%	80%	80%	80%	125%	125%	125%	125%
Output Voltage (Max)	70V	70V	70V	70V	70V	70V	70V	70V	70V	70V	70V
Output Current / Channel	50mA	50mA	150mA	150mA	50mA	150mA	50mA	150mA	150mA	50mA	150mA
Vce Saturation (Max)	400mV	400mV	300mV	300mV	400mV	300mV	400mV	300mV	300mV	400mV	300mV
Operating Temperature	-40°C to 100°C	-40°C to 100°C	-55°C to 100°C	-55°C to 100°C	-55°C to 100°C	-55°C to 100°C	-55°C to 100°C	-55°C to 100°C	-55°C to 100°C	-55°C to 100°C	-55°C to 100°C
Package / Case	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)
RoHS Status	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

CNY174TVM from Fairchild Semiconductor is the parametric equivalent, matching all electrical specifications and isolation voltage of the CNY174TM. This part maintains active product status and is recommended for applications requiring exact electrical performance without design modification.

For Upgraded Substitution (Higher Isolation Voltage):

Parts from the CNY17 series (CNY17-1-W00E, CNY17-1-W60E, CNY17-1G, CNY17-1M, CNY17-1XG, CNY17-2-W00E, CNY17-2-W60E, CNY17-2G, CNY17-2M) provide higher isolation voltage ratings (5000Vrms to 5300Vrms) while maintaining 6-DIP through-hole packaging and single-channel transistor output. These parts are manufactured by active suppliers (Broadcom Limited, Isocom Components 2004 LTD, Lite-On Inc.) and carry ROHS3 compliance certification.

Selection Criteria:

CNY17-1 series (40% to 80% CTR): Lower current transfer ratio; suitable for applications with lower input signal requirements
CNY17-2 series (63% to 125% CTR): Mid-range current transfer ratio; broader compatibility window
Broadcom Limited parts (CNY17-1-W00E, CNY17-1-W60E, CNY17-2-W00E, CNY17-2-W60E): 150mA output current capability
Isocom Components 2004 LTD parts (CNY17-1G, CNY17-2G, CNY17-1XG): 50mA output current capability, matching original specification
Lite-On Inc. parts (CNY17-1M, CNY17-2M): 150mA output current capability with active product status

All substitute parts maintain REACH compliance and EAR99 export classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can CNY174TVM be used as a direct replacement for CNY174TM?

A: Yes. CNY174TVM from Fairchild Semiconductor is a parametric equivalent with identical isolation voltage (4170Vrms), current transfer ratio range (160% to 320% @ 10mA), output voltage (70V), output current (50mA), and operating temperature range (-40°C to 100°C). Both use 6-DIP through-hole packaging. No circuit modification is required.

Q: What is the difference between CNY17-1 and CNY17-2 series substitutes?

A: The primary difference is current transfer ratio (CTR). CNY17-1 series has 40% to 80% CTR @ 10mA, while CNY17-2 series has 63% to 125% CTR @ 10mA. Both maintain 5000Vrms to 5300Vrms isolation voltage and 6-DIP packaging. Selection depends on input signal amplitude and circuit gain requirements.

Q: Why do some CNY17 substitutes have higher isolation voltage than the original CNY174TM?

A: Higher isolation voltage (5000Vrms to 5300Vrms versus 4170Vrms) provides additional safety margin and is backward compatible with applications designed for lower isolation ratings. This upgrade does not compromise functionality and is suitable for designs requiring enhanced isolation performance.

Q: Are there package compatibility concerns with CNY17-1XG?

A: CNY17-1XG uses 6-DIP (0.300", 7.62mm) packaging, which differs from the standard 6-DIP (0.400", 10.16mm) used by CNY174TM and most other substitutes. Verify PCB footprint compatibility before selection. All other CNY17 substitutes use standard 6-DIP (0.400", 10.16mm) packaging.

Q: Which substitute offers the highest output current capability?

A: Broadcom Limited parts (CNY17-1-W00E, CNY17-1-W60E, CNY17-2-W00E, CNY17-2-W60E) and Lite-On Inc. parts (CNY17-1M, CNY17-2M) provide 150mA output current per channel, compared to 50mA in the original CNY174TM. This increased capability allows driving higher-impedance loads or multiple parallel loads.

Q: Are all substitute parts RoHS compliant?

A: All CNY17 series substitutes carry ROHS3 compliance certification. The original CNY174TM does not specify RoHS status. For applications requiring RoHS compliance, CNY17 series parts are suitable alternatives.

Q: What is the inventory status of these substitutes?

A: All substitute parts listed are in active production with confirmed inventory availability. CNY174TVM (Fairchild Semiconductor) has 919 units in stock. CNY17 series parts range from 743 to 12,100 units in stock across multiple manufacturers and variants.

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