4N27M Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N27M is an optoisolator transistor with base output manufactured by onsemi, designed for high-voltage isolation applications. This component provides 4170Vrms isolation voltage in a 6-DIP through-hole package and is currently in active production status. Alternative models may be required due to inventory constraints, application-specific parameter requirements, or supply chain considerations.

Substiute Parts

4N27M

onsemiIn Stock: 242064N27M Datasheet

Current PartRFQ

4N25-000E

Broadcom LimitedIn Stock: 30614N25-000E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The 4N27M can be substituted with the 4N25-000E based on the following criteria:

Matching Parameters (Substitution Basis):

• Package / Case: Both use 6-DIP (0.300", 7.62mm) through-hole configuration
• Output Type: Both feature transistor with base output
• Voltage - Output (Max): Both rated at 30V maximum
• Vce Saturation (Max): Both at 500mV
• Input Type: Both accept DC input
• Mounting Type: Both through-hole
• RoHS Status: Both ROHS3 Compliant
• REACH Status: Both REACH Unaffected

Differing Parameters (Application-Dependent):

• Voltage - Isolation: 4N27M provides 4170Vrms; 4N25-000E provides 2500Vrms
• Current Transfer Ratio (Min): 4N27M at 10% @ 10mA; 4N25-000E at 20% @ 10mA
• Current - Output / Channel: 4N25-000E rated at 100mA (4N27M not specified)
• Operating Temperature Range: 4N27M -40°C ~ 100°C; 4N25-000E -55°C ~ 100°C

Parameter Comparison

Engineering Selection Recommendations

Both the 4N27M and 4N25-000E are active production components with ROHS3 compliance and REACH unaffected status, making them suitable for regulated applications.

The 4N27M is the primary choice when isolation voltage of 4170Vrms is required. The 4N25-000E is suitable for applications requiring 2500Vrms isolation or lower, and offers a higher minimum current transfer ratio (20% versus 10%), which may provide improved performance in signal transmission applications.

Selection between these parts must be based on the specific isolation voltage requirement of the application. The 4N25-000E's extended lower operating temperature limit (-55°C versus -40°C) may be advantageous in extreme cold environments.

Frequently Asked Questions (FAQ)

Q: Can the 4N25-000E replace the 4N27M in all applications?

A: No. The 4N25-000E provides 2500Vrms isolation voltage compared to the 4N27M's 4170Vrms. Substitution is only valid for applications where 2500Vrms isolation meets the design requirement. Applications requiring higher isolation voltage must use the 4N27M.

Q: Are the packages physically identical?

A: Yes. Both components use the 6-DIP (0.300", 7.62mm) through-hole package, allowing direct physical substitution on PCBs without layout modifications.

Q: What is the difference in current transfer ratio between these parts?

A: The 4N27M has a minimum current transfer ratio of 10% @ 10mA, while the 4N25-000E has 20% @ 10mA. The higher ratio in the 4N25-000E indicates more efficient signal transmission for the same input current.

Q: Which part has a wider operating temperature range?

A: The 4N25-000E operates from -55°C to 100°C, providing a 15°C lower minimum temperature limit compared to the 4N27M's -40°C to 100°C range.

Q: Are both parts RoHS compliant?

A: Yes. Both the 4N27M and 4N25-000E are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for most applications.