HCPL-4504 Equivalent & Substitute Parts

Part Overview

The HCPL-4504 is an optoisolator with transistor output, providing 3750Vrms isolation voltage in an 8-DIP through-hole package. This component is classified as Active product status and is used in applications requiring galvanic isolation between input and output circuits with DC input signaling. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the allowed parameter ranges for this optoisolator category.

Substiute Parts

HCPL-4504

Broadcom LimitedIn Stock: 1447HCPL-4504 Datasheet

Current PartRFQ

HCPL-4504-000E

Broadcom LimitedIn Stock: 15411HCPL-4504-000E Datasheet

Parametric EquivalentRFQ

HCPL4503M

onsemiIn Stock: 6122HCPL4503M Datasheet

MFR RecommendedRFQ

SFH6345

Vishay Semiconductor Opto DivisionIn Stock: 2245SFH6345 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the HCPL-4504 optoisolator is determined by the following criteria:

Primary Compatibility Parameters:

• Package / Case: 8-DIP (0.300", 7.62mm) form factor
• Mounting Type: Through Hole
• Output Type: Transistor or Transistor with Base
• Number of Channels: 1
• Input Type: DC
• Current - Output / Channel: 8mA
• Voltage - Output (Max): 20V or greater

Isolation Voltage Consideration: Substitute parts must maintain isolation voltage at or above 3750Vrms. Parts with higher isolation ratings (5000Vrms, 5300Vrms) are acceptable as they provide enhanced isolation margin.

Current Transfer Ratio: Substitute parts must support the specified current transfer ratio range or demonstrate compatibility within the application's operational requirements.

Thermal Operating Range: Substitute parts must cover the operating temperature range of -55°C to 100°C or a subset thereof that includes the application's operating conditions.

Parameter Comparison

Engineering Selection Recommendations

HCPL-4504-000E (Broadcom Limited): This part is a parametric equivalent to the HCPL-4504, maintaining identical electrical specifications including isolation voltage, current transfer ratio, and switching times. The primary distinction is packaging format (Tube vs. standard packaging) and RoHS3 compliance status. Selection of this variant is appropriate when RoHS3 compliance is required for the end application.

HCPL4503M (onsemi): This part provides higher isolation voltage (5000Vrms) compared to the HCPL-4504 (3750Vrms), offering enhanced isolation margin. The output type is Transistor with Base, which provides additional circuit design flexibility. Current transfer ratio minimum is lower (19% vs. 25%), and switching times are slightly longer (250ns/260ns vs. 200ns/300ns). Operating temperature range is -40°C to 100°C, which does not extend to -55°C. This part is suitable for applications where higher isolation voltage is beneficial and the reduced low-temperature capability is acceptable. RoHS3 compliance is confirmed.

SFH6345 (Vishay Semiconductor Opto Division): This part provides the highest isolation voltage (5300Vrms) and maximum output voltage (25V) among the substitutes. Current transfer ratio minimum is 19%, and switching times are equal at 300ns for both turn-on and turn-off. Forward voltage is lowest (1.33V typical), which may reduce input power requirements. Operating temperature range matches the HCPL-4504 (-55°C to 100°C). RoHS3 compliance is confirmed.

Frequently Asked Questions (FAQ)

Q: Can HCPL-4504-000E be used as a direct replacement for HCPL-4504?

A: Yes. HCPL-4504-000E maintains identical electrical and mechanical specifications. The difference is packaging format and RoHS compliance status. Pin configuration and functional performance are equivalent.

Q: What is the key difference between HCPL4503M and HCPL-4504?

A: HCPL4503M provides higher isolation voltage (5000Vrms vs. 3750Vrms) and includes a base connection on the transistor output. Current transfer ratio minimum is lower (19% vs. 25%), and the operating temperature range does not extend to -55°C (minimum is -40°C). Switching times are slightly longer.

Q: Is SFH6345 compatible with HCPL-4504 in terms of package and pinout?

A: Yes. SFH6345 uses the same 8-DIP (0.300", 7.62mm) through-hole package. Electrical specifications differ in isolation voltage (5300Vrms), maximum output voltage (25V), and forward voltage (1.33V typical). These differences are compatible with applications designed for HCPL-4504.

Q: Which substitute part should be selected for RoHS3 compliance?

A: HCPL-4504-000E, HCPL4503M, and SFH6345 are all RoHS3 compliant. The original HCPL-4504 is RoHS non-compliant. Selection depends on additional requirements such as isolation voltage margin, operating temperature range, and output type.

Q: What is the impact of lower current transfer ratio in substitute parts?

A: Lower current transfer ratio (19% vs. 25% minimum) requires higher input current to achieve the same output current. Circuit design must account for this difference in input drive requirements. Applications with adequate input current capability are unaffected.

Q: Can HCPL4503M operate at -55°C?

A: No. HCPL4503M operating temperature range is -40°C to 100°C. Applications requiring operation below -40°C must use HCPL-4504, HCPL-4504-000E, or SFH6345.