CNY171TM Equivalent & Substitute Parts

Part Overview

The CNY171TM is a single-channel optoisolator with transistor output and base connection, manufactured by onsemi. It provides 4170Vrms isolation voltage in a 6-DIP through-hole package. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain compatibility across isolation voltage, output configuration, channel count, and package form factor while meeting the electrical performance requirements of the application.

Key Parameters

Parameter	CNY171TM Value
Manufacturer	onsemi
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	4170Vrms
Current Transfer Ratio (Min)	40% @ 10mA
Current Transfer Ratio (Max)	80% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Package / Case	6-DIP (0.400", 10.16mm)
Mounting Type	Through Hole
Operating Temperature	-40°C ~ 100°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the CNY171TM are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Single channel configuration (1 channel required)
Isolation voltage rating of 4170Vrms or higher
Transistor output with base connection
6-DIP through-hole package
Maximum output voltage of 70V
DC input type

Substitution Categories:

Category 1: Parametric Equivalents — Parts with identical or near-identical electrical specifications to the CNY171TM, including current transfer ratio range (40%-80% @ 10mA), switching times, and rise/fall times. These parts are direct functional replacements.

Category 2: Higher Isolation Voltage Substitutes — Parts with isolation voltage ratings of 5000Vrms or 5300Vrms, exceeding the CNY171TM requirement. These provide enhanced isolation margin and are compatible with applications designed for 4170Vrms isolation.

Category 3: Enhanced Current Transfer Ratio — Parts with higher current transfer ratio specifications (100%-300% or 63%-125% @ 10mA), offering improved gain characteristics while maintaining other critical parameters.

All substitute parts maintain the same output type (transistor with base), package form factor (6-DIP), and operating temperature range compatibility with the original specification.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ 10mA	CTR Max @ 10mA	Output Type	Max Output Voltage	Output Current	Package	Product Status
CNY171TM	onsemi	4170Vrms	40%	80%	Transistor w/ Base	70V	50mA	6-DIP (0.400")	Obsolete
H11AV1AM	onsemi	4170Vrms	100%	300%	Transistor w/ Base	70V	—	6-DIP (0.300")	Active
CNY171TVM	Fairchild Semiconductor	4170Vrms	40%	80%	Transistor w/ Base	70V	50mA	6-DIP (0.400")	Active
CNY17-1-W00E	Broadcom Limited	5000Vrms	40%	80%	Transistor w/ Base	70V	150mA	6-DIP (0.400")	Active
CNY17-1-W60E	Broadcom Limited	5000Vrms	40%	80%	Transistor w/ Base	70V	150mA	6-DIP (0.400")	Active
CNY17-1G	Isocom Components 2004 LTD	5300Vrms	40%	80%	Transistor w/ Base	70V	50mA	6-DIP (0.400")	Active
CNY17-1M	Lite-On Inc.	5000Vrms	40%	80%	Transistor w/ Base	70V	150mA	6-DIP (0.400")	Active
CNY17-1XG	Isocom Components 2004 LTD	5300Vrms	40%	80%	Transistor w/ Base	70V	50mA	6-DIP (0.300")	Active
CNY17-2-W00E	Broadcom Limited	5000Vrms	63%	125%	Transistor w/ Base	70V	150mA	6-DIP (0.400")	Active
CNY17-2-W60E	Broadcom Limited	5000Vrms	63%	125%	Transistor w/ Base	70V	150mA	6-DIP (0.400")	Active
CNY17-2G	Isocom Components 2004 LTD	5300Vrms	63%	125%	Transistor w/ Base	70V	50mA	6-DIP (0.400")	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent): The CNY171TVM from Fairchild Semiconductor is the closest parametric equivalent, matching the CNY171TM across isolation voltage (4170Vrms), current transfer ratio range (40%-80% @ 10mA), switching characteristics, and output current rating (50mA). Both use the 6-DIP (0.400", 10.16mm) package. The CNY171TVM is active in production, making it the preferred choice for direct substitution in existing designs.

Active Replacement with Enhanced Specifications: The CNY17-1-W00E and CNY17-1-W60E from Broadcom Limited provide higher isolation voltage (5000Vrms) and increased output current capability (150mA) while maintaining the same current transfer ratio range (40%-80% @ 10mA) and 6-DIP (0.400") package. These parts are suitable for applications requiring additional isolation margin or higher output current.

Alternative with Matching Output Current: The CNY17-1G and CNY17-1XG from Isocom Components 2004 LTD maintain the 50mA output current rating of the CNY171TM with higher isolation voltage (5300Vrms). The CNY17-1G uses the standard 6-DIP (0.400") package, while the CNY17-1XG uses the compact 6-DIP (0.300") package. Both are RoHS3 compliant and active in production.

Higher Gain Alternative: The CNY17-2-W00E, CNY17-2-W60E, and CNY17-2G offer increased current transfer ratio (63%-125% @ 10mA) with 5000Vrms or 5300Vrms isolation. These are suitable for applications where higher transistor gain is beneficial, provided the circuit design accommodates the different CTR specification.

Compliance Considerations: All recommended substitutes carry REACH Unaffected status and EAR99 ECCN classification, matching the CNY171TM. RoHS3 compliance is available from Isocom Components 2004 LTD and Broadcom Limited variants. Moisture sensitivity level (MSL 1 - Unlimited) is consistent across all active alternatives.

Frequently Asked Questions (FAQ)

Q: Can the H11AV1AM be used as a direct replacement for the CNY171TM? A: The H11AV1AM maintains the same 4170Vrms isolation voltage and transistor output configuration. However, it features a significantly higher current transfer ratio (100%-300% @ 10mA) compared to the CNY171TM (40%-80% @ 10mA). Additionally, the H11AV1AM uses a 6-DIP (0.300", 7.62mm) package versus the CNY171TM's 6-DIP (0.400", 10.16mm) package. Substitution requires verification that the circuit design accommodates the higher gain and package dimension difference.

Q: What is the difference between CNY17-1-W00E and CNY17-1-W60E? A: Both parts are manufactured by Broadcom Limited with identical electrical specifications: 5000Vrms isolation, 40%-80% CTR @ 10mA, 150mA output current, and 6-DIP (0.400") package. The suffix designations (-W00E and -W60E) indicate different packaging or lead configurations. Electrical performance and functional compatibility are equivalent.

Q: Are the Isocom CNY17-1G and CNY17-1XG interchangeable? A: Both parts are electrically identical with 5300Vrms isolation, 40%-80% CTR @ 10mA, and 50mA output current. The primary difference is package size: CNY17-1G uses 6-DIP (0.400", 10.16mm) while CNY17-1XG uses 6-DIP (0.300", 7.62mm). Package selection depends on PCB layout constraints and available board space.

Q: Why do some substitutes have higher isolation voltage ratings? A: Parts with 5000Vrms or 5300Vrms isolation exceed the CNY171TM's 4170Vrms requirement, providing additional safety margin and noise immunity in high-voltage isolation applications. These are fully compatible with designs specified for 4170Vrms isolation and offer enhanced performance in demanding environments.

Q: What is the significance of the current transfer ratio (CTR) difference? A: Current transfer ratio determines the transistor gain in the optoisolator. The CNY171TM specifies 40%-80% CTR @ 10mA. Substitutes with higher CTR (such as CNY17-2 series at 63%-125%) provide greater transistor gain, potentially reducing base drive requirements. Circuit designs must account for the different gain characteristics when selecting higher-CTR alternatives.

Q: Are all substitute parts RoHS compliant? A: RoHS3 compliance is confirmed for Broadcom Limited and Isocom Components 2004 LTD variants. The CNY171TVM from Fairchild Semiconductor does not list RoHS status in the provided specifications. Verify RoHS compliance requirements with your specific application and procurement standards.

Q: Can the CNY171TVM be used in new designs? A: Yes. The CNY171TVM is active in production and provides parametric equivalence to the CNY171TM across all critical specifications. It is suitable for both replacement of obsolete CNY171TM units and new design implementations.

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