4N27 Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N27 is an optoisolator with transistor output and base connection, manufactured by Isocom Components 2004 LTD. This single-channel device provides galvanic isolation rated at 7.5Vpk and is designed for DC input applications requiring transistor-based output control. The part is currently active in production with 13,600 units in stock. Substitute parts are identified when equivalent functional performance can be achieved within the allowed electrical and mechanical parameter ranges for optoisolator transistor output devices in 6-DIP packaging.

Substiute Parts

4N27

Isocom Components 2004 LTDIn Stock: 136424N27 Datasheet

Current PartRFQ

4N25-000E

Broadcom LimitedIn Stock: 30614N25-000E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 4N27 are identified based on the following critical parameters that define functional equivalence for optoisolator transistor output devices:

• Package Compatibility: 6-DIP (0.300", 7.62mm) through-hole mounting
• Output Configuration: Transistor with base connection
• Single Channel: One isolated channel per device
• Input Type: DC input
• Output Voltage Rating: Maximum 30V
• Operating Temperature Range: -55°C ~ 100°C
• Regulatory Compliance: ROHS3 Compliant, REACH Unaffected

The 4N25-000E meets these substitution criteria. While it features a higher isolation voltage rating (2500Vrms versus 7.5Vpk) and improved current transfer ratio (20% minimum versus 10% minimum), these represent enhanced performance characteristics that do not prevent substitution in applications designed for the 4N27. The 4N25-000E also provides higher output current capability (100mA versus 50mA) and faster switching times (3µs versus 2µs), making it suitable for equivalent or upgraded circuit implementations.

Parameter Comparison

Engineering Selection Recommendations

Both the 4N27 and 4N25-000E are active products with ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements. The 4N25-000E is qualified as a direct substitute based on identical package geometry, output configuration, and operating temperature range. Selection between these parts depends on application-specific requirements:

The 4N27 is appropriate for applications where the specified 7.5Vpk isolation voltage is sufficient and where the 50mA output current limit is adequate.

The 4N25-000E is appropriate for applications requiring higher isolation voltage (2500Vrms), higher output current capability (100mA), or improved current transfer ratio (20% minimum). The 4N25-000E also provides faster switching characteristics (3µs rise/fall time).

Both devices share identical maximum output voltage (30V), saturation voltage (500mV), forward voltage (1.2V), and operating temperature range (-55°C ~ 100°C), ensuring functional compatibility in circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the 4N25-000E replace the 4N27 in existing circuit designs?

A: Yes. The 4N25-000E is pin-compatible in 6-DIP packaging and provides equivalent or superior electrical performance across all common parameters. The higher isolation voltage and output current capability of the 4N25-000E do not create incompatibility with circuits designed for the 4N27.

Q: What are the key differences between these parts?

A: The 4N25-000E provides higher isolation voltage (2500Vrms versus 7.5Vpk), higher minimum current transfer ratio (20% versus 10%), higher output current per channel (100mA versus 50mA), and faster switching times (3µs versus 2µs). Maximum output voltage, saturation voltage, and operating temperature range are identical.

Q: Are both parts available in the same packaging?

A: Yes. Both the 4N27 and 4N25-000E use 6-DIP (0.300", 7.62mm) through-hole packaging with identical pin configurations, enabling direct board-level substitution.

Q: Do both parts meet current regulatory compliance standards?

A: Yes. Both the 4N27 and 4N25-000E are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Which part should be selected for new designs?

A: Selection is based on application requirements. The 4N25-000E is suitable for applications requiring higher isolation voltage or output current. The 4N27 is suitable for applications where the specified isolation voltage and output current are sufficient. Both parts are active products with equivalent regulatory status.