4N37 Optoisolator Transistor with Base Output

Part Overview

The 4N37 is a single-channel optoisolator with transistor output and base connection, manufactured by Isocom Components 2004 LTD. This component provides galvanic isolation between input and output circuits with a rated isolation voltage of 7.5Vpk. The device is classified as Active status and is suitable for applications requiring DC input signal isolation with transistor-based output control. Alternative models may be required when higher isolation voltage ratings, increased output current capacity, or different packaging specifications are necessary for specific application requirements.

Substiute Parts

4N37

Isocom Components 2004 LTDIn Stock: 191744N37 Datasheet

Current PartRFQ

4N35-000E

Broadcom LimitedIn Stock: 39614N35-000E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The 4N35-000E manufactured by Broadcom Limited qualifies as a substitute for the 4N37 based on the following alignment of critical parameters:

Matching Parameters:

• Single-channel optoisolator configuration
• Transistor output with base connection
• 6-DIP through-hole package (0.300", 7.62mm)
• Current Transfer Ratio minimum of 100% @ 10mA
• Maximum output voltage of 30V
• Vce saturation maximum of 300mV
• Forward voltage (Vf) typical of 1.2V
• Operating temperature range of -55°C ~ 100°C
• ROHS3 compliance and REACH unaffected status

Differentiation: The 4N35-000E provides higher isolation voltage (3550Vrms versus 7.5Vpk) and increased output current capacity (100mA versus 50mA per channel), making it suitable for applications requiring enhanced isolation performance or higher load current handling.

Parameter Comparison

Engineering Selection Recommendations

Both the 4N37 and 4N35-000E maintain Active product status and comply with ROHS3 requirements and REACH regulations. The 4N37 is suitable for applications with isolation voltage requirements of 7.5Vpk and output current demands up to 50mA per channel. The 4N35-000E is appropriate for designs requiring higher isolation voltage performance (3550Vrms) and increased output current capacity (100mA per channel). Both devices share identical package geometry, operating temperature range, and output voltage specifications, enabling direct pin-compatible substitution when isolation voltage and current requirements are satisfied.

Frequently Asked Questions (FAQ)

Q: Can the 4N35-000E directly replace the 4N37 in existing designs?

A: Yes, the 4N35-000E is pin-compatible with the 4N37 in 6-DIP through-hole applications. Both devices share identical package dimensions, pin configuration, and output voltage specifications. Substitution is valid when the application requirements do not exceed the 4N35-000E's higher isolation voltage and current ratings.

Q: What are the key differences between these optoisolators?

A: The primary differences are isolation voltage rating (4N37: 7.5Vpk; 4N35-000E: 3550Vrms) and maximum output current per channel (4N37: 50mA; 4N35-000E: 100mA). Both devices maintain identical current transfer ratios, output voltage limits, and saturation characteristics.

Q: Are both parts suitable for the same operating temperature range?

A: Yes, both the 4N37 and 4N35-000E operate across the identical temperature range of -55°C to 100°C.

Q: What packaging options are available for these parts?

A: Both devices are available in 6-DIP through-hole package format with 0.300-inch (7.62mm) spacing. The 4N35-000E is supplied in tube packaging.

Q: Do both parts meet current compliance standards?

A: Yes, both the 4N37 and 4N35-000E are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.