PS2502L-2-A Optoisolator Equivalent & Substitute Parts

Part Overview

The PS2502L-2-A is a 2-channel optoisolator with Darlington output configuration, providing 5000Vrms isolation voltage in an 8-SMD package. This component is classified as Obsolete and is no longer actively supported by the manufacturer CEL. Given the obsolete status, identification of functionally equivalent substitute parts is essential for design continuity and system reliability in applications requiring 5000Vrms galvanic isolation with Darlington output stages.

Substiute Parts

PS2502L-2-A

CELIn Stock: 906PS2502L-2-A Datasheet

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LTV-825S

Lite-On Inc.In Stock: 799LTV-825S Datasheet

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LTV-825S-TA

Lite-On Inc.In Stock: 1197LTV-825S-TA Datasheet

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LTV-825S-TA1

Lite-On Inc.In Stock: 890LTV-825S-TA1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the PS2502L-2-A requires matching the following critical electrical and mechanical parameters:

• Isolation Voltage: 5000Vrms (non-negotiable for galvanic isolation performance)
• Number of Channels: 2 (functional requirement for dual-channel applications)
• Output Type: Darlington (determines transistor stage behavior and characteristics)
• Package / Case: 8-SMD, Gull Wing (ensures mechanical and footprint compatibility with existing PCB designs)
• Input Type: DC (signal level compatibility)

The Lite-On Inc. LTV-825 series parts (LTV-825S, LTV-825S-TA, LTV-825S-TA1) meet all substitution criteria. These parts maintain identical isolation voltage, channel count, Darlington output configuration, and package specifications. The LTV-825 series is actively manufactured and ROHS3 compliant, ensuring long-term supply availability and environmental compliance.

Parameter Comparison

Engineering Selection Recommendations

The LTV-825S, LTV-825S-TA, and LTV-825S-TA1 are functionally equivalent optoisolators suitable for replacing the obsolete PS2502L-2-A. All three variants are manufactured by Lite-On Inc., hold active product status, and comply with ROHS3 environmental standards, providing assurance of continuous availability and regulatory compliance.

LTV-825S is supplied in standard packaging and is suitable for general component sourcing.

LTV-825S-TA and LTV-825S-TA1 are supplied in Tape & Reel (TR) packaging, which is appropriate for high-volume manufacturing processes and automated assembly operations.

Design considerations include the following parameter differences:

• The LTV-825 series exhibits higher current transfer ratios (600-7500% @ 1mA versus 200% @ 1mA), resulting in improved switching efficiency.
• The LTV-825 series demonstrates faster rise and fall times (60µs, 53µs versus 100µs, 100µs), enabling higher-speed signal switching applications.
• The LTV-825 series has reduced maximum output current per channel (80mA versus 160mA) and output voltage (35V versus 40V), requiring verification that application-level current and voltage requirements do not exceed these specifications.
• The LTV-825 series operates across a narrower temperature range (-30°C to 100°C versus -55°C to 100°C), limiting suitability for extreme low-temperature environments below -30°C.

Frequently Asked Questions (FAQ)

Q: Can the LTV-825S series directly replace the PS2502L-2-A in my circuit?

A: Direct mechanical and electrical substitution is possible within the constraints of your application requirements. The identical 8-SMD, Gull Wing package ensures pinout compatibility and PCB footprint compatibility. Verify that your application current and voltage requirements do not exceed the LTV-825 series specifications (80mA per channel, 35V maximum output voltage) and that operating temperatures remain within -30°C to 100°C.

Q: What is the difference between LTV-825S, LTV-825S-TA, and LTV-825S-TA1?

A: These three variants are electrically and functionally identical optoisolators. The primary difference is packaging: LTV-825S is supplied in standard form, while LTV-825S-TA and LTV-825S-TA1 are supplied in Tape & Reel format. Tape & Reel packaging is designed for automated pick-and-place assembly and high-volume manufacturing environments.

Q: How do the LTV-825 series specifications compare to the PS2502L-2-A for switching performance?

A: The LTV-825 series demonstrates superior switching characteristics with rise and fall times of 60µs and 53µs respectively, compared to 100µs for both parameters in the PS2502L-2-A. Additionally, the LTV-825 series exhibits higher current transfer ratios (600-7500% @ 1mA) relative to the PS2502L-2-A (200% @ 1mA), enabling more efficient transistor switching with reduced input current requirements.

Q: Is the reduced temperature operating range of the LTV-825 series a limitation?

A: The LTV-825 series operates from -30°C to 100°C, compared to the PS2502L-2-A range of -55°C to 100°C. If your application requires operation below -30°C, the LTV-825 series is not suitable. For applications within the -30°C to 100°C range, this specification difference is not a limiting factor.

Q: Are the LTV-825 series parts RoHS compliant?

A: Yes, all LTV-825 series variants (LTV-825S, LTV-825S-TA, LTV-825S-TA1) are ROHS3 compliant, meeting current environmental and regulatory standards for electronic components in the European Union and other regulated markets.

Q: Can I use LTV-825S in applications requiring 160mA output current?

A: No. The LTV-825 series is specified for a maximum of 80mA per channel, which is half the output current rating of the PS2502L-2-A (160mA). Substitution is only appropriate if your application requires 80mA or less per channel. Applications requiring higher output currents require alternative component selection or external output buffer stages.