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CNY172TM Optoisolator Equivalent & Substitute Parts
Part Overview
The CNY172TM 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 device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain compatibility across isolation voltage, output current capability, switching characteristics, and package form factor.
Substiute Parts
Key Parameters
| Parameter | CNY172TM Value |
|---|---|
| Isolation Voltage | 4170Vrms |
| Number of Channels | 1 |
| Output Type | Transistor with Base |
| Current Transfer Ratio (Min) | 63% @ 10mA |
| Current Transfer Ratio (Max) | 125% @ 10mA |
| Output Current / Channel | 50mA |
| Maximum Output Voltage | 70V |
| Turn On / Turn Off Time | 2µs / 3µs |
| Operating Temperature Range | -40°C to 100°C |
| Package / Case | 6-DIP (0.400", 10.16mm) |
| Mounting Type | Through Hole |
| Input Type | DC |
Substitute Part Grouping Explanation
Substitute parts are classified into two categories based on parametric alignment with the CNY172TM:
Parametric Equivalent (Direct Replacement):
- CNY172TVM (Fairchild Semiconductor): Identical electrical specifications across all critical parameters including 4170Vrms isolation, 63-125% CTR range, 50mA output current, and matching switching times. Active product status provides long-term availability.
Similar Substitutes (Higher Isolation Voltage / Enhanced Performance):
- CNY17-1-W00E, CNY17-1-W60E, CNY17-1G, CNY17-1M, CNY17-1XG (5000-5300Vrms isolation): These parts exceed the CNY172TM isolation requirement with 5000Vrms or 5300Vrms ratings. Current transfer ratio ranges from 40-80% (lower than CNY172TM). Output current capability increases to 150mA for Broadcom and Lite-On variants. Switching characteristics vary. All maintain 6-DIP package compatibility.
- CNY17-2-W00E, CNY17-2-W60E, CNY17-2G, CNY17-2M (5000-5300Vrms isolation): Similar isolation voltage elevation with 63-125% CTR matching the CNY172TM. Output current reaches 150mA. Switching times differ. All in 6-DIP package.
Substitution Logic: Electrical compatibility is determined by: (1) isolation voltage equal to or exceeding 4170Vrms, (2) output type as transistor with base, (3) package form factor 6-DIP, (4) single channel configuration, and (5) DC input type. Current transfer ratio, output current, and switching characteristics may vary within acceptable design margins depending on application requirements.
Parameter Comparison
| Parameter | CNY172TM (onsemi) | CNY172TVM (Fairchild) | CNY17-1-W00E (Broadcom) | CNY17-1-W60E (Broadcom) | CNY17-1G (Isocom) | CNY17-1M (Lite-On) | CNY17-1XG (Isocom) | CNY17-2-W00E (Broadcom) | CNY17-2-W60E (Broadcom) | CNY17-2G (Isocom) | CNY17-2M (Lite-On) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| Output Type | Transistor with Base | Transistor with Base | Transistor with Base | Transistor with Base | Transistor with Base | Transistor with Base | Transistor with Base | Transistor with Base | Transistor with Base | Transistor with Base | Transistor with Base |
| CTR Min @ 10mA | 63% | 63% | 40% | 40% | 40% | 40% | 40% | 63% | 63% | 63% | 63% |
| CTR Max @ 10mA | 125% | 125% | 80% | 80% | 80% | 80% | 80% | 125% | 125% | 125% | 125% |
| Output Current / Channel | 50mA | 50mA | 150mA | 150mA | 50mA | 150mA | 50mA | 150mA | 150mA | 50mA | 150mA |
| Maximum Output Voltage | 70V | 70V | 70V | 70V | 70V | 70V | 70V | 70V | 70V | 70V | 70V |
| Turn On Time (Typ) | 2µs | 2µs | — | — | 3µs | — | 3µs | — | — | 4.2µs | — |
| Turn Off Time (Typ) | 3µs | 3µs | — | — | 18µs | — | 18µs | — | — | 23µs | — |
| 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) |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole |
| Input Type | DC | DC | DC | DC | DC | DC | DC | DC | DC | DC | DC |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
For Direct Replacement (Identical Specifications): CNY172TVM from Fairchild Semiconductor is the parametric equivalent, matching all electrical characteristics of the CNY172TM. As an active product, it provides the most straightforward migration path with no design modifications required. This option is preferred when the original 4170Vrms isolation voltage and 63-125% CTR specification must be maintained exactly.
For Enhanced Isolation Voltage Applications: CNY17-1-W00E, CNY17-1-W60E, CNY17-2-W00E, and CNY17-2-W60E from Broadcom Limited offer 5000Vrms isolation with increased output current (150mA). These are suitable when higher isolation margins are acceptable. CNY17-2 variants maintain the 63-125% CTR range matching the original specification.
For Extended Temperature Range: All substitute parts support -55°C to 100°C operating range, exceeding the CNY172TM specification of -40°C to 100°C. This provides additional thermal margin for demanding environments.
For RoHS and Compliance Requirements: All active substitute parts carry RoHS3 compliance certification. The CNY172TM is not specified for RoHS status. Broadcom and Lite-On variants are explicitly RoHS3 compliant. Isocom variants are also RoHS3 compliant.
Package Consideration: CNY17-1XG from Isocom uses a narrower 6-DIP package (0.300", 7.62mm) compared to the standard 0.400" (10.16mm) footprint. This variant requires PCB layout verification before selection.
Frequently Asked Questions (FAQ)
Q: Can CNY172TVM be used as a direct replacement for CNY172TM? A: Yes. CNY172TVM matches all electrical parameters of the CNY172TM including 4170Vrms isolation voltage, 63-125% current transfer ratio, 50mA output current, and switching times. It is manufactured by Fairchild Semiconductor and carries active product status.
Q: What is the difference between CNY17-1 and CNY17-2 series substitutes? A: CNY17-1 variants have 40-80% current transfer ratio range, while CNY17-2 variants have 63-125% CTR range matching the original CNY172TM specification. Both series offer 5000-5300Vrms isolation. Selection depends on whether the higher CTR specification is required for your application.
Q: Are higher isolation voltage parts (5000Vrms or 5300Vrms) compatible with designs specified for 4170Vrms? A: Yes. Higher isolation voltage is a superset capability and does not create incompatibility. However, verify that your circuit design does not depend on the specific 4170Vrms rating. In most applications, higher isolation voltage provides additional safety margin.
Q: What is the impact of different output current ratings (50mA vs 150mA)? A: The CNY172TM is rated for 50mA output current. Broadcom and Lite-On substitutes provide 150mA capability. If your design draws less than 50mA, either part is acceptable. If higher current is needed, the 150mA variants provide additional headroom. Isocom variants maintain the 50mA specification.
Q: Does the CNY17-1XG package difference affect PCB compatibility? A: CNY17-1XG uses a narrower 6-DIP package (0.300" vs 0.400" width). This requires PCB footprint verification. Standard 0.400" footprint designs should use other variants. Consult PCB layout documentation before selecting CNY17-1XG.
Q: Which substitute offers the best long-term availability? A: All substitute parts carry active product status. Lite-On CNY17-1M and CNY17-2M show the highest inventory levels (12,100 and 1,542 units respectively), indicating strong supply chain support. Broadcom variants also maintain substantial inventory across multiple part numbers.
Q: Are there compliance or certification differences between substitutes? A: All active substitute parts are RoHS3 compliant and REACH unaffected. The original CNY172TM does not specify RoHS status. For applications requiring RoHS certification, any active substitute meets this requirement.
Q: What switching time differences should I consider? A: CNY172TM specifies 2µs turn-on and 3µs turn-off. Isocom variants (CNY17-1G, CNY17-1XG, CNY17-2G) show longer turn-off times (18-23µs). Broadcom and Lite-On variants do not specify switching times. For timing-critical applications, verify that longer switching times do not impact system performance.
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