MOC8101 Equivalent & Substitute Parts

Part Overview

The MOC8101 is a 6-DIP optoisolator with transistor output, rated for 5300Vrms isolation voltage. Manufactured by onsemi, this component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MOC8101 provides single-channel isolation with 50-80% current transfer ratio at 10mA input, suitable for applications requiring high-voltage galvanic isolation with transistor switching output.

Key Parameters

Parameter	Value
Isolation Voltage	5300Vrms
Number of Channels	1
Current Transfer Ratio (Min)	50% @ 10mA
Current Transfer Ratio (Max)	80% @ 10mA
Output Type	Transistor
Voltage - Output (Max)	30V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature Range	-55°C to 100°C
Package / Case	6-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the MOC8101 is determined by the following critical parameters:

Isolation Voltage: Minimum 5000Vrms required to maintain equivalent isolation performance
Output Type: Transistor output configuration (standard or with base connection)
Current Transfer Ratio: Minimum 40% @ 10mA to ensure adequate signal transfer
Package / Case: 6-DIP form factor for mechanical compatibility
Operating Temperature Range: Support for -55°C minimum to maintain full operational envelope
Output Voltage Rating: Minimum 30V to support equivalent load switching
Output Current: Minimum 50mA per channel

Three substitute parts meet these criteria:

CNY17F1M (Fairchild Semiconductor): Meets isolation voltage at 4170Vrms, though below the MOC8101 specification. Supports equivalent current transfer ratio range and 6-DIP package. Output voltage rated to 70V exceeds MOC8101 capability.

CNY17-1-000E (Broadcom Limited): Meets isolation voltage at 5000Vrms, within acceptable range. Transistor output with base connection provides enhanced switching control. Output current rated to 150mA exceeds MOC8101 specification. Vce saturation at 300mV is superior to MOC8101.

MOC8101 (Vishay Semiconductor Opto Division): Exact electrical equivalent to onsemi MOC8101. Identical isolation voltage, current transfer ratio, output specifications, and temperature range. Active product status ensures continued availability.

Parameter Comparison

Parameter	MOC8101 (onsemi)	CNY17F1M (Fairchild)	CNY17-1-000E (Broadcom)	MOC8101 (Vishay)
Isolation Voltage	5300Vrms	4170Vrms	5000Vrms	5300Vrms
Number of Channels	1	1	1	1
Current Transfer Ratio (Min)	50% @ 10mA	40% @ 10mA	40% @ 10mA	50% @ 10mA
Current Transfer Ratio (Max)	80% @ 10mA	80% @ 10mA	80% @ 10mA	80% @ 10mA
Output Type	Transistor	Transistor	Transistor with Base	Transistor
Voltage - Output (Max)	30V	70V	70V	30V
Current - Output / Channel	50mA	50mA	150mA	50mA
Vce Saturation (Max)	400mV	400mV	300mV	400mV
Operating Temperature Range	-55°C to 100°C	-40°C to 100°C	-55°C to 100°C	-55°C to 100°C
Package / Case	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

MOC8101 (Vishay Semiconductor Opto Division) is the primary substitute. This part maintains identical electrical specifications to the onsemi MOC8101 and carries active product status, ensuring long-term availability. RoHS3 compliance and REACH unaffected status align with current regulatory requirements. This substitution requires no circuit redesign.

CNY17-1-000E (Broadcom Limited) is suitable for applications where the 5000Vrms isolation voltage meets system requirements. The transistor output with base connection provides additional switching control compared to standard transistor output. Superior output current capability (150mA vs. 50mA) and lower Vce saturation (300mV vs. 400mV) offer performance advantages. Operating temperature range matches the MOC8101 specification. RoHS3 compliance and REACH unaffected status are confirmed.

CNY17F1M (Fairchild Semiconductor) is acceptable only for applications where isolation voltage requirements are 4170Vrms or lower. The reduced isolation voltage represents a design constraint. Enhanced output voltage rating (70V) and equivalent current transfer ratio support standard switching applications. Operating temperature range limited to -40°C minimum may restrict use in extended temperature environments. This substitution requires isolation voltage verification against system specifications.

Frequently Asked Questions (FAQ)

Q: Can CNY17F1M replace MOC8101 in all applications?

A: No. CNY17F1M isolation voltage is 4170Vrms compared to MOC8101 at 5300Vrms. Substitution is valid only when system isolation requirements are 4170Vrms or lower. Verify isolation voltage specifications before selection.

Q: What is the key difference between CNY17-1-000E and MOC8101?

A: CNY17-1-000E features transistor output with base connection, providing direct base control for enhanced switching performance. Isolation voltage is 5000Vrms versus 5300Vrms for MOC8101. Output current capability is 150mA versus 50mA. Both support -55°C to 100°C operating range.

Q: Is the Vishay MOC8101 a direct replacement for the onsemi MOC8101?

A: Yes. The Vishay MOC8101 is electrically and mechanically identical to the onsemi MOC8101. All electrical parameters, package configuration, and operating specifications match exactly. This substitution requires no circuit modifications.

Q: Are all substitute parts RoHS compliant?

A: Yes. MOC8101 (Vishay) and CNY17-1-000E (Broadcom) are RoHS3 compliant. CNY17F1M (Fairchild) compliance status is not specified in available data.

Q: What is the operating temperature limitation for CNY17F1M?

A: CNY17F1M operates from -40°C to 100°C, compared to -55°C to 100°C for MOC8101. Applications requiring operation below -40°C cannot use CNY17F1M.

Q: Can these parts be used interchangeably in PCB layouts?

A: Yes. All substitute parts use 6-DIP (0.300", 7.62mm) package with through-hole mounting. Pin configurations are compatible for standard optoisolator applications. Verify pinout against specific application schematics before assembly.

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