4N45 Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N45 is an optoisolator with Darlington output and integrated base connection, manufactured by Broadcom Limited. This component provides 3750Vrms isolation in a 6-DIP through-hole package and is designed for applications requiring high-voltage signal isolation with DC input control. The part is currently active in production. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same product category, enabling design flexibility and supply chain continuity.

Substiute Parts

4N45

Broadcom LimitedIn Stock: 8714N45 Datasheet

Current PartRFQ

4N45-000E

Broadcom LimitedIn Stock: 39044N45-000E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 4N45 are identified based on strict equivalence across the following critical parameters:

• Voltage isolation rating: 3750Vrms
• Number of channels: 1
• Output configuration: Darlington with Base
• Maximum output voltage: 7V
• Maximum output current per channel: 60mA
• Current transfer ratio range: 200% to 1000% @ 10mA
• Package type: 6-DIP through-hole
• Operating temperature range: -40°C to 85°C
• Input type: DC

The 4N45-000E maintains identical electrical specifications and mechanical compatibility with the base 4N45 part number, qualifying it as a parametric equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the 4N45 and 4N45-000E are active production parts from Broadcom Limited with identical electrical and mechanical specifications. Selection between these parts may be based on compliance requirements and regulatory status. The 4N45-000E carries ROHS3 compliance certification, while the base 4N45 is marked as RoHS non-compliant. Both parts maintain REACH Unaffected status and are classified under ECCN EAR99. For applications requiring RoHS3 compliance, the 4N45-000E is the appropriate selection. For applications without RoHS compliance mandates, either part satisfies the electrical and mechanical requirements identically.

Frequently Asked Questions (FAQ)

Q: Can the 4N45-000E be used as a direct replacement for the 4N45?

A: Yes. The 4N45-000E is a parametric equivalent with identical isolation voltage (3750Vrms), output configuration (Darlington with Base), current transfer ratio (200% to 1000% @ 10mA), maximum output voltage (7V), maximum output current (60mA), and 6-DIP package dimensions. Pin-to-pin compatibility and electrical performance are equivalent.

Q: What is the primary difference between these two part numbers?

A: The 4N45-000E is ROHS3 compliant, while the base 4N45 is RoHS non-compliant. All electrical and mechanical parameters are identical. Selection depends on regulatory requirements for your application.

Q: Are there any thermal or operating condition differences?

A: No. Both parts operate across the identical temperature range of -40°C to 85°C with the same electrical performance specifications.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. Both parts use the 6-DIP through-hole package with identical pin spacing (0.300", 7.62mm) and mounting requirements. No PCB layout modifications are required when substituting between these parts.

Q: What isolation voltage do these optoisolators provide?

A: Both the 4N45 and 4N45-000E provide 3750Vrms isolation, suitable for high-voltage signal separation applications.

Q: Are there inventory considerations when selecting between these parts?

A: Inventory levels may vary. The 4N45-000E currently has higher stock availability (3857 Pcs) compared to the 4N45 (769 Pcs), which may influence procurement decisions based on lead time requirements.