CNY172SD Equivalent & Substitute Parts

Part Overview

The CNY172SD is an optoisolator transistor with base output manufactured by onsemi, featuring 5300Vrms isolation voltage in a 6-SMD surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The CNY172SD provides DC input with transistor output including base connection, suitable for high-voltage isolation applications requiring 1-channel isolation with 50mA output current capability.

Key Parameters

Parameter	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
Output Voltage (Max)	70V
Output Current / Channel	50mA
Vce Saturation (Max)	300mV
Operating Temperature Range	-55°C ~ 100°C
Package / Case	6-SMD, Gull Wing
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the CNY172SD is determined by the following critical parameters:

Isolation Voltage: Minimum 5000Vrms (CNY172SD operates at 5300Vrms)
Output Type: Transistor with Base configuration
Number of Channels: Single channel
Package / Case: 6-SMD, Gull Wing surface mount
Output Voltage (Max): 70V
Operating Temperature Range: Minimum -55°C to 100°C coverage
Input Type: DC

Substitute parts are grouped into two categories based on isolation voltage performance:

Category A - Full Voltage Match (5300Vrms): CNY17-1SMT&R and CNY17-1XSM maintain the exact 5300Vrms isolation specification of the original part.

Category B - Reduced Voltage (5000Vrms): CNY172SR2M, CNY17-1-300E, CNY17-1-500E, CNY17-1S, CNY17-1S-TA, CNY17-1S-TA1, CNY17-1X007T, and CNY17-1X009T operate at 5000Vrms isolation, representing a 5.7% reduction from the original specification. These parts maintain all other critical parameters within acceptable ranges for most applications.

Parameter Comparison

Parameter	CNY172SD (Main)	CNY172SR2M	CNY17-1-300E	CNY17-1-500E	CNY17-1S	CNY17-1S-TA	CNY17-1S-TA1	CNY17-1SMT&R	CNY17-1X007T	CNY17-1X009T	CNY17-1XSM
Manufacturer	onsemi	Fairchild Semiconductor	Broadcom Limited	Broadcom Limited	Lite-On Inc.	Lite-On Inc.	Lite-On Inc.	Isocom Components 2004 LTD	Vishay Semiconductor Opto Division	Vishay Semiconductor Opto Division	Isocom Components 2004 LTD
Isolation Voltage	5300Vrms	4170Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5300Vrms	5000Vrms	5000Vrms	5300Vrms
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	63% @ 10mA	63% @ 10mA	40% @ 10mA	40% @ 10mA	40% @ 10mA	40% @ 10mA	40% @ 10mA	40% @ 10mA	40% @ 10mA	40% @ 10mA	40% @ 10mA
Current Transfer Ratio (Max)	125% @ 10mA	125% @ 10mA	80% @ 10mA	80% @ 10mA	80% @ 10mA	80% @ 10mA	80% @ 10mA	80% @ 10mA	80% @ 10mA	80% @ 10mA	80% @ 10mA
Output Voltage (Max)	70V	70V	70V	70V	70V	70V	70V	70V	70V	70V	70V
Output Current / Channel	50mA	50mA	150mA	150mA	150mA	150mA	150mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	300mV	400mV	300mV	300mV	300mV	300mV	300mV	400mV	400mV	400mV	400mV
Operating Temperature Range	-55°C ~ 100°C	-40°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 ~ 110°C	-55°C ~ 110°C	-55°C ~ 100°C
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-SMD, Gull Wing	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

Engineering Selection Recommendations

Primary Substitutes (Preferred)

CNY17-1SMT&R and CNY17-1XSM are the preferred substitutes, maintaining the exact 5300Vrms isolation voltage specification of the CNY172SD. Both parts are active products with full availability. CNY17-1SMT&R is supplied by Isocom Components 2004 LTD in Tape & Reel packaging with 768 units in stock. CNY17-1XSM is also supplied by Isocom Components 2004 LTD in Tube packaging with 1088 units in stock. Both achieve ROHS3 compliance and carry REACH Unaffected status.

Secondary Substitutes (5000Vrms Isolation)

CNY17-1X007T and CNY17-1X009T from Vishay Semiconductor Opto Division operate at 5000Vrms isolation with extended operating temperature range to 110°C. Both are active products with substantial inventory (12660 and 12870 units respectively). These parts maintain the 50mA output current specification and are suitable for applications where the 5% reduction in isolation voltage is acceptable.

CNY17-1-300E and CNY17-1-500E from Broadcom Limited provide 5000Vrms isolation with increased output current capability (150mA). Both are active products with high inventory availability (20039 and 3200 units respectively) and ROHS3 compliance.

CNY17-1S, CNY17-1S-TA, and CNY17-1S-TA1 from Lite-On Inc. operate at 5000Vrms isolation with 150mA output current. All three are active products with ROHS3 compliance. CNY17-1S-TA1 offers the highest inventory (26200 units) in Tape & Reel packaging.

Not Recommended

CNY172SR2M from Fairchild Semiconductor operates at 4170Vrms isolation, representing a 21% reduction from the CNY172SD specification. Additionally, the operating temperature range is limited to -40°C ~ 100°C, excluding the lower temperature extreme of the original part. This part is not suitable for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can CNY172SR2M replace CNY172SD?

A: No. CNY172SR2M operates at 4170Vrms isolation, which is 21% lower than the CNY172SD specification of 5300Vrms. Additionally, its operating temperature range (-40°C ~ 100°C) does not cover the full lower temperature range of the original part (-55°C). This part is not suitable for direct substitution.

Q: What is the difference between 5300Vrms and 5000Vrms isolation voltage?

A: The CNY172SD operates at 5300Vrms isolation, while most substitute parts operate at 5000Vrms. This represents a 5.7% reduction in isolation voltage specification. For applications with strict isolation voltage requirements, CNY17-1SMT&R or CNY17-1XSM should be selected to maintain the original 5300Vrms specification.

Q: Are the Broadcom and Lite-On substitutes compatible with the CNY172SD?

A: Broadcom (CNY17-1-300E, CNY17-1-500E) and Lite-On (CNY17-1S, CNY17-1S-TA, CNY17-1S-TA1) substitutes are compatible in terms of package, output type, and operating temperature range. However, they operate at 5000Vrms isolation and feature higher output current (150mA vs. 50mA). The reduced isolation voltage may not be acceptable for all applications. Verify isolation voltage requirements before selection.

Q: What is the significance of Current Transfer Ratio differences?

A: The CNY172SD specifies 63-125% Current Transfer Ratio at 10mA, while most substitutes specify 40-80%. Lower CTR values require higher input current to achieve the same output current. Circuit designs relying on the higher CTR of the original part may require input current adjustments when using substitute parts with lower CTR specifications.

Q: How do packaging options affect substitution?

A: All substitute parts maintain the 6-SMD, Gull Wing surface mount package, ensuring mechanical and electrical compatibility. Packaging variations (Tube, Tape & Reel, Cut Tape) affect handling and assembly processes but do not impact electrical performance. Select packaging based on assembly requirements and inventory management practices.

Q: What is the impact of Vce Saturation differences?

A: The CNY172SD specifies 300mV maximum Vce Saturation, while several substitutes specify 400mV. Higher saturation voltage results in greater voltage drop across the transistor output stage, increasing power dissipation. For applications sensitive to output voltage drop, verify that the 400mV specification is acceptable for circuit operation.

Q: Are all substitute parts RoHS compliant?

A: Most active substitute parts carry ROHS3 compliance certification. CNY172SR2M does not list RoHS status in the provided specifications. All listed substitutes maintain REACH Unaffected status, consistent with the original CNY172SD.

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