PS2561D-1Y-A Optoisolator - Equivalent & Substitute Parts

Part Overview

The PS2561D-1Y-A is a 5000Vrms isolation optoisolator with transistor output in a 4-DIP package, manufactured by CEL. This component is discontinued at DiGi Electronics, necessitating identification of compatible substitute components that maintain functional equivalence in isolation voltage, channel count, output type, and physical packaging. The substitution analysis focuses on parts meeting the critical electrical and mechanical parameters required for direct circuit board replacement.

Substiute Parts

PS2561D-1Y-A

CELIn Stock: 16615PS2561D-1Y-A Datasheet

Current PartRFQ

LTV-816

Lite-On Inc.In Stock: 45423LTV-816 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute compatibility for the PS2561D-1Y-A is determined by strict equivalence in the following critical parameters:

• Voltage - Isolation: 5000Vrms (non-negotiable for isolation specification)
• Number of Channels: 1 (functional requirement)
• Output Type: Transistor (circuit interface requirement)
• Package / Case: 4-DIP (0.300", 7.62mm) (mechanical and electrical interconnect requirement)
• Mounting Type: Through Hole (board assembly compatibility)

The LTV-816 from Lite-On Inc. meets all these critical parameters. Variations in Current Transfer Ratio, rise/fall times, and Vce saturation represent acceptable deviations within the optoisolator product class, provided the minimum current transfer ratio and output voltage specifications are not exceeded in the application requirements.

Parameter Comparison

Engineering Selection Recommendations

PS2561D-1Y-A to LTV-816 Substitution:

The LTV-816 optoisolator from Lite-On Inc. qualifies as a direct substitute for the discontinued PS2561D-1Y-A. Both components are ROHS3 compliant and maintain identical isolation voltage (5000Vrms), channel configuration, output type (transistor), and physical packaging (4-DIP through-hole). The LTV-816 is currently active in production with 45,400 pieces in stock, providing immediate procurement availability.

Differences in operating temperature range (-30°C ~ 110°C for LTV-816 versus -55°C ~ 110°C for PS2561D-1Y-A) require application-specific evaluation. Applications requiring operation below -30°C must retain the original PS2561D-1Y-A specification or identify alternative solutions. The LTV-816 exhibits lower Vce saturation (200mV maximum versus 300mV), representing improved transistor output performance. Higher maximum current transfer ratio (600% versus 400%) in the LTV-816 maintains forward compatibility for input current control requirements.

Frequently Asked Questions (FAQ)

Q: What makes the LTV-816 a suitable substitute for the PS2561D-1Y-A?

A: The LTV-816 matches the critical electrical and mechanical parameters: 5000Vrms isolation, single-channel transistor output, 80V maximum output voltage, 50mA output current per channel, and 4-DIP through-hole package. Both components are ROHS3 compliant with identical voltage specifications and physical interconnects.

Q: Are there differences in operating temperature range between these parts?

A: Yes. The PS2561D-1Y-A operates from -55°C to 110°C, while the LTV-816 operates from -30°C to 110°C. Applications requiring operation below -30°C must evaluate whether the original specification is mandatory or if the LTV-816 temperature range is acceptable for the end application.

Q: How do the current transfer ratios compare?

A: Both parts specify a 50% minimum current transfer ratio at 5mA input current. The maximum current transfer ratio differs: PS2561D-1Y-A reaches 400% while LTV-816 reaches 600%. This variation is within the acceptable range for optoisolator substitution and does not impair functional compatibility.

Q: Can the LTV-816 be used in existing circuit board designs without modifications?

A: Yes. The LTV-816 and PS2561D-1Y-A share identical package and case dimensions (4-DIP, 0.300", 7.62mm), mounting type (through-hole), and pin configurations. Direct board-level substitution is mechanically and electrically feasible without PCB redesign.

Q: What are the differences in Vce saturation?

A: The LTV-816 provides lower Vce saturation at 200mV maximum compared to 300mV for the PS2561D-1Y-A. This represents improved transistor output characteristics and is advantageous for applications requiring lower output impedance or reduced power dissipation at saturation.