MCT2200300 Optoisolator Equivalent & Substitute Parts

Part Overview

The MCT2200300 is an optoisolator transistor with base output manufactured by onsemi, rated for 5300Vrms isolation voltage in a 6-DIP package. This component provides galvanic isolation for single-channel DC input applications with transistor output capability. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production support. Substitute parts must maintain compatibility across isolation voltage, output type, package form factor, and electrical performance parameters.

Key Parameters

Parameter	MCT2200300 Value
Manufacturer	onsemi
Category	Optoisolators
Product Status	Obsolete
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	20% @ 10mA
Input Type	DC
Output Type	Transistor with Base
Voltage - Output (Max)	30V
Current - Output / Channel	50mA
Voltage - Forward (Vf) (Typ)	1.25V
Current - DC Forward (If) (Max)	100mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Through Hole
Package / Case	6-DIP (0.300", 7.62mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MCT2200300 is determined by the following critical parameters:

Primary Compatibility Criteria:

Single-channel optoisolator configuration
Transistor output with base connection
DC input type
6-DIP through-hole package form factor
Operating temperature range -55°C to 100°C
Isolation voltage rating of 5000Vrms or higher
Maximum output voltage of 30V
Moisture sensitivity level 1 (Unlimited)

Secondary Performance Criteria:

Current transfer ratio minimum of 20% @ 10mA
Maximum forward current (If) of 80mA or higher
Vce saturation maximum of 500mV or lower
Turn-on/turn-off switching characteristics compatible with 2µs or slower response times

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

Group A - High Isolation (5000Vrms - 5300Vrms): Parts maintaining the original isolation specification, suitable for direct replacement in applications requiring maximum isolation performance.

Group B - Reduced Isolation (2500Vrms): Parts with lower isolation voltage, applicable only when circuit design permits reduced isolation requirements.

Parameter Comparison

Parameter	MCT2200300	4N35	4N37	4N25-000E	4N25-060E	4N25-W00E
Manufacturer	onsemi	onsemi	Vishay	Broadcom	Broadcom	Broadcom
Product Status	Obsolete	Obsolete	Active	Active	Active	Active
Voltage - Isolation	5300Vrms	5300Vrms	5000Vrms	2500Vrms	2500Vrms	2500Vrms
Current Transfer Ratio (Min)	20% @ 10mA	100% @ 10mA	100% @ 10mA	20% @ 10mA	20% @ 10mA	20% @ 10mA
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	30V	30V	30V	30V	30V	30V
Current - Output / Channel	50mA	Not specified	50mA	100mA	100mA	100mA
Voltage - Forward (Vf) (Typ)	1.25V	1.18V	1.3V	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	100mA	100mA	50mA	80mA	80mA	80mA
Vce Saturation (Max)	400mV	300mV	Not specified	500mV	500mV	500mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-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)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.400", 10.16mm)
RoHS Status	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Highest Compatibility):

The 4N35 from onsemi provides the closest electrical match to the MCT2200300, maintaining identical 5300Vrms isolation voltage and 6-DIP (0.300", 7.62mm) package dimensions. However, the 4N35 is also obsolete. The 4N37 from Vishay Semiconductor Opto Division is the recommended primary substitute, offering 5000Vrms isolation (within acceptable range), active product status, ROHS3 compliance, and identical package footprint. The 4N37 provides superior current transfer ratio (100% @ 10mA) and lower Vce saturation (300mV typical), enhancing circuit performance.

For Cost-Optimized Selection (Reduced Isolation Requirement):

The 4N25-000E, 4N25-060E, and 4N25-W00E from Broadcom Limited are active products with ROHS3 compliance. These parts operate at 2500Vrms isolation, suitable only for applications where circuit design permits reduced isolation voltage. All three maintain the required transistor output with base, DC input, and -55°C to 100°C operating range. The 4N25-000E and 4N25-060E use standard 6-DIP (0.300", 7.62mm) spacing, while 4N25-W00E uses wider 6-DIP (0.400", 10.16mm) spacing, requiring PCB layout verification before selection.

Compliance Considerations:

The 4N37, 4N25-000E, 4N25-060E, and 4N25-W00E all carry ROHS3 compliance certification. The MCT2200300 and 4N35 do not specify RoHS status. All parts maintain REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can the 4N25 series parts directly replace the MCT2200300?

A: The 4N25 series (4N25-000E, 4N25-060E, 4N25-W00E) are mechanically compatible in 6-DIP packages but operate at 2500Vrms isolation versus the MCT2200300's 5300Vrms. Substitution is valid only if circuit design permits reduced isolation voltage. Verify isolation requirements in your application before selection.

Q: What is the difference between 4N25-000E, 4N25-060E, and 4N25-W00E?

A: All three parts share identical electrical specifications (2500Vrms isolation, 20% CTR minimum, 100mA output current). The primary difference is package spacing: 4N25-000E and 4N25-060E use standard 6-DIP (0.300", 7.62mm) spacing, while 4N25-W00E uses wider 6-DIP (0.400", 10.16mm) spacing. PCB layout compatibility must be confirmed before selection.

Q: Why is the 4N37 recommended over the 4N35?

A: Both parts maintain 5000Vrms-5300Vrms isolation and identical package dimensions. The 4N37 is actively manufactured by Vishay with ROHS3 compliance, while the 4N35 is obsolete. The 4N37 also provides superior electrical performance with 100% current transfer ratio and 300mV Vce saturation, compared to the 4N35's 100% CTR and unspecified saturation voltage.

Q: Are there package footprint differences between substitute parts?

A: Yes. The MCT2200300, 4N35, 4N37, 4N25-000E, and 4N25-060E all use 6-DIP (0.300", 7.62mm) spacing and are footprint-compatible. The 4N25-W00E uses wider 6-DIP (0.400", 10.16mm) spacing and requires PCB layout modification. Verify package dimensions against your PCB design before ordering.

Q: What isolation voltage should I select for my application?

A: The MCT2200300 specifies 5300Vrms isolation. If your circuit design requires this full isolation level, select the 4N37 (5000Vrms) or 4N35 (5300Vrms). If your application permits reduced isolation, the 4N25 series (2500Vrms) offers active product status and ROHS3 compliance. Consult your circuit isolation requirements and safety standards before selection.

Q: Do all substitute parts have the same current output capability?

A: No. The MCT2200300 and 4N37 specify 50mA maximum output current per channel. The 4N25 series specifies 100mA maximum output current per channel. The 4N35 does not specify output current. Verify output current requirements in your application design.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The 4N37, 4N25-000E, 4N25-060E, and 4N25-W00E carry ROHS3 certification. If your application or supply chain requires ROHS3 compliance, these parts are suitable; the MCT2200300 and 4N35 do not specify compliance status.

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