HCPL-J456 Equivalent & Substitute Parts

Part Overview

The HCPL-J456 is a Logic Output Optoisolator with Open Collector, Schottky Clamped output configuration manufactured by Broadcom Limited. This single-channel device provides 3750Vrms isolation with 15kV/µs common mode transient immunity and is designed for DC input applications requiring galvanic isolation in industrial and automotive control systems. The product maintains Active status with 4600 units in current inventory. Alternative components may be required due to application-specific performance requirements, supply chain considerations, or design specification changes.

Substiute Parts

HCPL-J456

Broadcom LimitedIn Stock: 4698HCPL-J456 Datasheet

Current PartRFQ

HCPL4503M

onsemiIn Stock: 6122HCPL4503M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HCPL-J456 is evaluated based on the following critical parameters that define functional equivalence:

Isolation Voltage: The HCPL-J456 provides 3750Vrms isolation. Substitute parts must meet or exceed this isolation specification to maintain system safety and regulatory compliance.

Number of Channels: Single-channel configuration is required for direct substitution.

Output Configuration: The Open Collector, Schottky Clamped output type defines the electrical interface. Substitute parts with different output topologies (such as Transistor with Base) represent functional alternatives rather than direct equivalents, as they require different circuit design considerations.

Common Mode Transient Immunity: The 15kV/µs CMTI specification is critical for high-speed switching applications. Substitute parts must support equivalent or superior CMTI performance.

Package and Mounting: The 8-DIP Through Hole package defines physical compatibility with existing PCB designs.

Operating Temperature Range: The -40°C ~ 100°C range must be maintained for environmental compatibility.

Supply Voltage Range: The 4.5V ~ 30V supply specification must be supported by substitute parts.

The HCPL4503M is identified as a manufacturer-recommended substitute. While it maintains the same package, channel count, and operating temperature range, it differs in output configuration (Transistor with Base versus Open Collector, Schottky Clamped) and isolation voltage (5000Vrms versus 3750Vrms). These differences require circuit-level evaluation for specific applications.

Parameter Comparison

Engineering Selection Recommendations

HCPL-J456 (Primary Component): Maintains Active product status with established supply availability (4600 units in stock). Suitable for applications requiring Open Collector, Schottky Clamped output topology and 3750Vrms isolation. RoHS non-compliant status requires verification against system-level compliance requirements.

HCPL4503M (Manufacturer-Recommended Substitute): Offers higher isolation voltage (5000Vrms) and ROHS3 compliance. The Transistor with Base output configuration provides different electrical characteristics and requires circuit redesign. Lower maximum output current (8 mA versus 15 mA) must be evaluated against load requirements. Both components maintain identical operating temperature range and package form factor, enabling physical interchangeability on PCB level. Selection between these components depends on specific isolation voltage requirements, output topology compatibility, and regulatory compliance mandates.

Frequently Asked Questions (FAQ)

Q: Can HCPL4503M directly replace HCPL-J456 in existing designs?

A: Physical replacement is possible due to identical 8-DIP package and pin count. However, electrical compatibility requires circuit-level evaluation. The HCPL4503M uses Transistor with Base output versus Open Collector, Schottky Clamped output, necessitating different pull-up resistor configurations and load impedance calculations. Output current capability differs (8 mA versus 15 mA).

Q: What are the isolation voltage differences between these parts?

A: HCPL-J456 provides 3750Vrms isolation, while HCPL4503M provides 5000Vrms isolation. Applications requiring minimum 3750Vrms isolation can use either component. Applications with higher isolation requirements must use HCPL4503M or equivalent higher-voltage alternatives.

Q: How do output configurations differ between these optoisolators?

A: HCPL-J456 features Open Collector, Schottky Clamped output, which provides fast switching with integrated clamping diode. HCPL4503M features Transistor with Base output, allowing external base drive control. These topologies require different external circuit designs and are not pin-compatible at the functional level despite identical package form.

Q: What is the impact of RoHS compliance differences?

A: HCPL-J456 is RoHS non-compliant, while HCPL4503M is ROHS3 compliant. Systems subject to RoHS regulatory requirements must use HCPL4503M or equivalent compliant alternatives. Non-regulated applications may use either component based on technical requirements.

Q: Are both components suitable for -40°C to 100°C operating range?

A: Yes, both HCPL-J456 and HCPL4503M support identical -40°C to 100°C operating temperature range, ensuring thermal compatibility for equivalent environmental applications.