PS2561B-1-A Optoisolator Equivalent & Substitute Parts

Part Overview

The PS2561B-1-A is a 5000Vrms isolation optoisolator with transistor output manufactured by CEL in a 4-DIP package. This component provides galvanic isolation for DC input signals with single-channel transistor switching capability. The PS2561B-1-A is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

PS2561B-1-A

CELIn Stock: 2287PS2561B-1-A Datasheet

Current PartRFQ

LTV-816

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PS2561B-1-A is determined by the following critical parameters:

Mandatory Matching Parameters:

• Isolation voltage: 5000Vrms
• Number of channels: 1
• Output type: Transistor
• Package type: 4-DIP (0.300", 7.62mm)
• Mounting type: Through Hole
• Maximum output voltage: 80V
• Maximum output current: 50mA

Allowable Parameter Ranges:

• Current Transfer Ratio (Min): 50% to 100% @ 5mA
• Current Transfer Ratio (Max): 400% to 600% @ 5mA
• Operating temperature range: -30°C to -55°C minimum; 110°C maximum
• Vce Saturation: 200mV to 300mV
• Forward voltage (Vf): 1.17V to 1.2V

The LTV-816 manufactured by Lite-On Inc. meets all mandatory matching parameters and operates within the allowable ranges for variable parameters.

Parameter Comparison

Engineering Selection Recommendations

LTV-816 as Primary Substitute:

The LTV-816 is suitable as a direct substitute for the PS2561B-1-A in applications where the operating temperature minimum requirement does not fall below -30°C. Both components are ROHS3 compliant and carry identical moisture sensitivity ratings (MSL 1).

The LTV-816 demonstrates superior electrical performance in saturation voltage (200mV versus 300mV), which may provide marginal advantages in switching applications. The LTV-816 current transfer ratio maximum of 600% exceeds the PS2561B-1-A specification of 400%, indicating potentially tighter output current control in the LTV-816.

The LTV-816 is currently active in production with 45,400 units in stock, compared to the PS2561B-1-A which is discontinued. Both components share identical package geometry, pinout compatibility, and electrical interface requirements for through-hole PCB mounting.

Temperature Consideration:

Applications requiring operation below -30°C must retain the PS2561B-1-A or identify alternative components with extended low-temperature ratings. The PS2561B-1-A supports -55°C minimum operation, whereas the LTV-816 minimum is -30°C.

Frequently Asked Questions (FAQ)

Q: Can the LTV-816 replace the PS2561B-1-A in all applications?

A: The LTV-816 is compatible with PS2561B-1-A applications where the minimum operating temperature requirement does not exceed -30°C. If your application requires operation below -30°C, the LTV-816 is not suitable. All other electrical and mechanical parameters are compatible.

Q: What is the difference in current transfer ratio between these parts?

A: The PS2561B-1-A specifies 100% to 400% CTR @ 5mA. The LTV-816 specifies 50% to 600% CTR @ 5mA. The LTV-816 has a lower minimum but higher maximum. Both ranges overlap in the 100% to 400% region, making them functionally equivalent for most applications.

Q: Are the packages identical?

A: Yes. Both the PS2561B-1-A and LTV-816 use 4-DIP (0.300", 7.62mm) through-hole packages with identical pinout and PCB footprint compatibility.

Q: What is the significance of the Vce saturation difference?

A: The LTV-816 has a maximum Vce saturation of 200mV compared to the PS2561B-1-A at 300mV. Lower saturation voltage indicates reduced voltage drop across the output transistor, resulting in lower power dissipation and potentially improved switching performance in low-voltage applications.

Q: Are both parts RoHS compliant?

A: Yes. Both the PS2561B-1-A and LTV-816 are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings.

Q: Why is the PS2561B-1-A discontinued?

A: The PS2561B-1-A is discontinued at DiGi Electronics. The LTV-816 remains in active production with substantial inventory availability, making it the recommended procurement choice for new designs and ongoing production support.