4N45#500 Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N45#500 is a Darlington optoisolator with base output manufactured by Broadcom Limited, designed for high-voltage isolation applications requiring 3750Vrms isolation rating. This component features a single channel configuration in a 6-SMD surface mount package with a current transfer ratio range of 200% to 1000% at 10mA input current.

The 4N45#500 is discontinued at DiGi Electronics. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

4N45#500

Broadcom LimitedIn Stock: 11304N45#500 Datasheet

Current PartRFQ

HCNW139-500E

Broadcom LimitedIn Stock: 40612HCNW139-500E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 4N45#500 is determined by the following critical parameters:

• Isolation Voltage: Minimum 3750Vrms required for functional equivalence
• Output Type: Must be Darlington with Base configuration
• Number of Channels: Single channel requirement
• Current Handling: Output current capability of 60mA per channel
• Operating Temperature Range: -40°C ~ 85°C compatibility
• Mounting Type: Surface mount configuration
• Input Type: DC input requirement

The HCNW139-500E meets these substitution criteria with enhanced specifications in isolation voltage (5000Vrms), maximum output voltage (18V), and improved product status (Active). The substitute maintains functional compatibility while offering superior electrical performance and current availability.

Parameter Comparison

Engineering Selection Recommendations

The HCNW139-500E is the qualified substitute for the 4N45#500 based on the following engineering criteria:

Product Status: The HCNW139-500E maintains Active product status with high inventory availability (40596 Pcs), ensuring reliable supply chain continuity compared to the discontinued 4N45#500.

Compliance: The HCNW139-500E is ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The original 4N45#500 is RoHS non-compliant, making the substitute preferable for new designs and applications subject to environmental regulations.

Electrical Performance: The HCNW139-500E provides superior isolation voltage (5000Vrms versus 3750Vrms) and higher maximum output voltage (18V versus 7V), offering enhanced safety margins and design flexibility while maintaining identical output current capability (60mA) and operating temperature range (-40°C ~ 85°C).

Package Consideration: The HCNW139-500E uses an 8-SMD package compared to the 6-SMD package of the 4N45#500. PCB layout modifications are required to accommodate the different pin configuration and package footprint.

Frequently Asked Questions (FAQ)

Q: Can the HCNW139-500E directly replace the 4N45#500 without circuit modifications?

A: The HCNW139-500E is electrically compatible as a functional substitute but requires PCB layout changes due to package differences (8-SMD versus 6-SMD). The pin configuration and footprint differ between the two components. Circuit operation remains compatible as both devices maintain Darlington with Base output configuration, identical output current capability, and overlapping operating temperature ranges.

Q: What are the key differences in isolation voltage between these components?

A: The 4N45#500 provides 3750Vrms isolation, while the HCNW139-500E provides 5000Vrms isolation. The higher isolation voltage of the substitute offers improved safety margins and is suitable for applications requiring enhanced voltage isolation. Both components exceed typical industrial isolation requirements.

Q: Are there any compliance differences between the 4N45#500 and HCNW139-500E?

A: Yes. The HCNW139-500E is ROHS3 compliant, while the 4N45#500 is RoHS non-compliant. For applications subject to RoHS regulations or environmental compliance requirements, the HCNW139-500E is the required choice. Both components are REACH unaffected and carry EAR99 ECCN classification.

Q: What is the impact of the different maximum output voltages?

A: The 4N45#500 has a maximum output voltage of 7V, while the HCNW139-500E supports 18V maximum output voltage. This difference allows the substitute to operate in higher voltage output circuits. For applications designed around the 7V limit of the original component, the higher rating of the substitute provides additional design margin without negative impact.

Q: How do the current transfer ratios compare?

A: The 4N45#500 has a current transfer ratio of 200% to 1000% at 10mA input. The HCNW139-500E specifies a minimum current transfer ratio of 200% at 12mA input. Both components meet the 200% minimum threshold required for typical optoisolator applications. The input current measurement point differs slightly (10mA versus 12mA), but both operate within standard DC input specifications.

Q: Is the HCNW139-500E suitable for all applications using the 4N45#500?

A: The HCNW139-500E is suitable for applications where the enhanced electrical specifications (higher isolation voltage and output voltage) are acceptable. PCB redesign is mandatory due to package differences. Applications with strict space constraints or existing PCB layouts designed for the 6-SMD package require evaluation of the larger 8-SMD footprint.