4N35 Optoisolator Transistor with Base Output - Equivalent & Substitute Parts

Part Overview

The 4N35 is a single-channel optoisolator with transistor output and base connection, manufactured by Isocom Components 2004 LTD. This component provides galvanic isolation up to 5300Vrms and is designed for DC input applications requiring transistor-based output control. The part is currently in active production status with 97,900 units available in stock. Alternative models are necessary when isolation voltage requirements differ, when specific output current or voltage specifications are required, or when component availability from alternative manufacturers is preferred for supply chain redundancy.

Substiute Parts

4N35

Isocom Components 2004 LTDIn Stock: 979304N35 Datasheet

Current PartRFQ

4N35-000E

Broadcom LimitedIn Stock: 39614N35-000E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 4N35 optoisolator is determined by the following critical parameters:

• Isolation Voltage (5300Vrms): The primary isolation specification that defines the maximum voltage differential the component can withstand between input and output circuits.
• Number of Channels (1): Single-channel configuration for independent signal isolation.
• Output Type (Transistor with Base): Presence of base connection for external control of transistor saturation characteristics.
• Current Transfer Ratio (100% @ 10mA): Minimum gain specification at specified input current.
• Package / Case (6-DIP): Physical form factor and pin configuration for PCB compatibility.
• Vce Saturation (300mV Max): Output transistor saturation voltage specification.
• Operating Temperature Range (-55°C ~ 100°C): Functional temperature limits.

The 4N35-000E variant from Broadcom Limited is identified as a substitute part. While it maintains the same package, channel count, output type, and temperature range, it operates at a reduced isolation voltage of 3550Vrms. This substitution is valid only in applications where the lower isolation voltage meets system requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the 4N35 and 4N35-000E maintain active product status and full ROHS3 compliance. Selection between these parts depends on isolation voltage requirements:

• Select 4N35 when system design requires 5300Vrms isolation voltage or when operating in high-voltage differential environments.
• Select 4N35-000E when application isolation requirements are satisfied by 3550Vrms and when additional output specifications (30V maximum output voltage, 100mA output current) are compatible with circuit design.

Both parts are REACH unaffected and carry EAR99 classification. Compliance status is equivalent between variants.

Frequently Asked Questions (FAQ)

Q: Can the 4N35-000E be used as a direct replacement for the 4N35?

A: The 4N35-000E is a functional substitute only when the application isolation voltage requirement is 3550Vrms or lower. The reduced isolation rating is the primary difference. All other electrical characteristics, package configuration, and compliance certifications are compatible.

Q: What is the significance of the isolation voltage difference between 5300Vrms and 3550Vrms?

A: Isolation voltage specifies the maximum voltage differential that can be safely applied between input and output circuits without risk of breakdown. Applications requiring higher voltage isolation must use the 4N35. Applications with lower voltage differentials can use either part.

Q: Are the 6-DIP packages physically identical?

A: Both parts use the 6-DIP (0.300", 7.62mm) package with identical pin configuration and through-hole mounting. PCB layout compatibility is maintained between variants.

Q: Do both parts have the same current transfer ratio specification?

A: Both parts specify a minimum current transfer ratio of 100% at 10mA input current, ensuring equivalent gain characteristics for DC input applications.

Q: What compliance certifications apply to both parts?

A: Both the 4N35 and 4N35-000E are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export purposes.