PS8502L3-AX Optoisolator Equivalent & Substitute Parts

Part Overview

The PS8502L3-AX is a single-channel optoisolator with transistor output manufactured by CEL, designed for high-voltage isolation applications requiring 5000Vrms isolation rating. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally compatible alternatives for ongoing design support and procurement.

The PS8502L3-AX operates with DC input, transistor output configuration, and is packaged in 8-SMD surface mount format suitable for automated assembly processes.

Substiute Parts

PS8502L3-AX

CELIn Stock: 1060PS8502L3-AX Datasheet

Current PartRFQ

HCPL-4504#300

Broadcom LimitedIn Stock: 1119HCPL-4504#300 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the PS8502L3-AX is determined by the following critical parameters:

Mandatory Matching Criteria:

• Single-channel configuration
• Transistor output type
• 8-SMD surface mount package with gull wing leads
• DC input type
• Operating temperature range: -55°C ~ 100°C
• Output current capability: 8mA per channel

Allowable Parameter Variations:

• Voltage isolation rating: Substitute must meet or exceed 5000Vrms requirement
• Current transfer ratio: Substitute minimum must be ≥15% @ 16mA
• Turn-on/turn-off timing: Substitute must not exceed 220ns/350ns specifications
• Maximum output voltage: Substitute must support ≥35V
• Forward voltage: Substitute Vf must not exceed 1.7V
• Maximum forward current: Substitute must support ≥25mA

The HCPL-4504#300 manufactured by Broadcom Limited meets the mandatory matching criteria for package type, channel count, output type, and input configuration. However, this substitute exhibits reduced isolation voltage (3750Vrms versus 5000Vrms) and lower maximum output voltage (20V versus 35V), representing a downgrade in isolation and voltage handling capability.

Parameter Comparison

Engineering Selection Recommendations

PS8502L3-AX (Original Component):

• RoHS3 compliant, suitable for regulated markets requiring environmental compliance
• Discontinued status limits long-term procurement viability
• 5000Vrms isolation and 35V maximum output voltage support high-voltage isolation applications
• Current inventory: 987 pieces available

HCPL-4504#300 (Substitute):

• Active product status ensures ongoing availability and supply chain continuity
• RoHS non-compliant status restricts use in regulated applications requiring RoHS certification
• Reduced isolation voltage (3750Vrms) and maximum output voltage (20V) limit applicability to lower-voltage isolation requirements
• Improved current transfer ratio (25% minimum versus 15% minimum) and faster switching times (200ns/300ns versus 220ns/350ns) provide performance advantages in compatible applications
• Current inventory: 1057 pieces available

Selection between these components depends on application requirements for isolation voltage, output voltage rating, and regulatory compliance mandates. The HCPL-4504#300 is suitable only for applications where 3750Vrms isolation and 20V maximum output voltage are sufficient, and where RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can HCPL-4504#300 directly replace PS8502L3-AX in all applications?

A: No. The HCPL-4504#300 has reduced isolation voltage (3750Vrms versus 5000Vrms) and lower maximum output voltage (20V versus 35V). Substitution is valid only for applications where these lower ratings are acceptable.

Q: What is the impact of the isolation voltage difference?

A: The PS8502L3-AX provides 5000Vrms isolation, while HCPL-4504#300 provides 3750Vrms. Applications requiring high-voltage isolation above 3750Vrms cannot use the substitute without circuit redesign.

Q: Does the RoHS compliance difference affect substitution?

A: Yes. The PS8502L3-AX is RoHS3 compliant; the HCPL-4504#300 is RoHS non-compliant. Applications subject to RoHS regulations cannot use the substitute.

Q: Are the package dimensions identical?

A: Both components use 8-SMD gull wing surface mount packages. Physical footprints are compatible for PCB placement.

Q: What are the switching time differences?

A: HCPL-4504#300 has faster switching: 200ns turn-on (versus 220ns) and 300ns turn-off (versus 350ns). This represents a performance upgrade for timing-sensitive applications.

Q: Is the current transfer ratio difference significant?

A: HCPL-4504#300 has higher minimum current transfer ratio (25% versus 15%) and specified maximum (60%), providing better optical coupling efficiency and more predictable performance.

Q: Can I use PS8502L3-AX in applications designed for HCPL-4504#300?

A: Yes. The PS8502L3-AX exceeds the electrical specifications of HCPL-4504#300 in isolation voltage and output voltage rating, making it suitable for any application compatible with the substitute.