MCT5201 Equivalent & Substitute Parts

Part Overview

The MCT5201 is an optoisolator transistor with base output manufactured by onsemi, designed for high-voltage isolation applications. This 6-DIP package component provides 5300Vrms isolation with a single channel and transistor output configuration. The MCT5201 is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain compatibility across isolation voltage, output current capacity, package form factor, and thermal operating range to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	MCT5201
Manufacturer	onsemi
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	120% @ 5mA
Output Type	Transistor with Base
Voltage - Output (Max)	30V
Current - Output / Channel	150mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Package / Case	6-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MCT5201 is determined by the following critical parameters:

Primary Compatibility Criteria:

Package / Case: 6-DIP (0.300", 7.62mm) form factor with Through Hole mounting
Output Type: Transistor with Base configuration
Number of Channels: Single channel (1)
Input Type: DC
Operating Temperature Range: -55°C ~ 100°C minimum
Voltage - Isolation: Minimum 5000Vrms (within 6% tolerance of MCT5201's 5300Vrms)
Current - Output / Channel: Minimum 150mA capability
Vce Saturation: Maximum 400mV

Secondary Compatibility Criteria:

Voltage - Output (Max): 30V or greater
Current Transfer Ratio: Minimum 100% at specified test current

The identified substitute parts (4N35-000E and CNY17-4) maintain the required package, output configuration, and thermal operating range. Isolation voltage and output current parameters remain within acceptable substitution boundaries for equivalent circuit performance.

Parameter Comparison

Parameter	MCT5201	4N35-000E	CNY17-4
Manufacturer	onsemi	Broadcom Limited	Lite-On Inc.
Number of Channels	1	1	1
Voltage - Isolation	5300Vrms	3550Vrms	5000Vrms
Current Transfer Ratio (Min)	120% @ 5mA	100% @ 10mA	160% @ 10mA
Output Type	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	30V	30V	70V
Current - Output / Channel	150mA	100mA	150mA
Vce Saturation (Max)	400mV	300mV	300mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Package / Case	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
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

CNY17-4 (Lite-On Inc.) is the primary substitute for MCT5201 applications. This part maintains isolation voltage within 5.7% of the original specification (5000Vrms vs. 5300Vrms), matches the 150mA output current requirement, and is classified as Active product status with ROHS3 compliance. The CNY17-4 provides superior current transfer ratio performance (160% minimum) and enhanced output voltage capability (70V maximum).

4N35-000E (Broadcom Limited) is a secondary substitute option. While this part maintains package compatibility, thermal range, and transistor-with-base output configuration, the isolation voltage specification (3550Vrms) represents a 33% reduction from MCT5201. Additionally, the maximum output current (100mA) falls below the MCT5201 requirement (150mA). The 4N35-000E is suitable only for applications where reduced isolation voltage and lower output current are acceptable. This part carries ROHS3 compliance and Active product status.

Both substitute parts are manufactured by suppliers with established product availability and active production status, providing long-term supply continuity compared to the obsolete MCT5201.

Frequently Asked Questions (FAQ)

Q: Can the 4N35-000E directly replace the MCT5201 in all applications?

A: No. The 4N35-000E has a maximum output current of 100mA, which is insufficient for circuits requiring the MCT5201's 150mA capability. Additionally, the 3550Vrms isolation voltage is 33% lower than the MCT5201's 5300Vrms specification. Use 4N35-000E only in applications with reduced isolation and current requirements.

Q: Is the CNY17-4 a direct pin-compatible replacement?

A: Yes. The CNY17-4 maintains the 6-DIP (0.300", 7.62mm) package form factor, Through Hole mounting, and transistor-with-base output configuration. Pin assignments are compatible with MCT5201 circuit layouts.

Q: What is the isolation voltage difference between MCT5201 and CNY17-4?

A: The CNY17-4 provides 5000Vrms isolation compared to MCT5201's 5300Vrms, representing a 5.7% reduction. This difference remains within acceptable substitution parameters for most high-voltage isolation applications.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both 4N35-000E and CNY17-4 are ROHS3 compliant. The MCT5201 RoHS status is not specified in available documentation.

Q: Which substitute part offers better performance characteristics?

A: The CNY17-4 provides superior specifications: higher current transfer ratio (160% minimum vs. 120% for MCT5201), greater output voltage capability (70V vs. 30V), and isolation voltage closer to the original specification (5000Vrms vs. 3550Vrms for 4N35-000E).

Q: What is the inventory status of substitute parts?

A: CNY17-4 has extensive availability (89,800 pcs in stock). 4N35-000E has moderate availability (3,942 pcs in stock). Both parts are manufactured by active suppliers with ongoing production.

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