PS2761-1 Optoisolator Equivalent & Substitute Parts

Part Overview

The PS2761-1 is a single-channel optoisolator with transistor output manufactured by CEL, designed for high-voltage isolation applications requiring 3750Vrms isolation rating. This component features a 4-SOP surface mount package and is classified as obsolete. Due to its obsolete status and limited availability from the original manufacturer, identifying equivalent substitute parts is essential for design continuity and procurement planning. The LTV-357T from Lite-On Inc. serves as a direct functional equivalent with enhanced performance characteristics and active product status.

Substiute Parts

PS2761-1

CELIn Stock: 20346PS2761-1 Datasheet

Current PartRFQ

LTV-357T

Lite-On Inc.In Stock: 10147LTV-357T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PS2761-1 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Voltage - Isolation: 3750Vrms (identical isolation rating required)
• Number of Channels: 1 (single-channel configuration)
• Output Type: Transistor (transistor output topology)
• Package / Case: 4-SMD, Gull Wing (physical and electrical compatibility)
• Mounting Type: Surface Mount (PCB assembly compatibility)

Allowable Parameter Variations:

• Current Transfer Ratio: Substitute minimum must meet or exceed 50% @ 5mA; maximum may exceed 400% @ 5mA
• Voltage - Output (Max): Substitute may be lower or equal to 40V
• Current - Output / Channel: Substitute may be lower or equal to 40mA
• Vce Saturation (Max): Substitute may be lower or equal to 300mV
• Operating Temperature Range: Substitute may equal or exceed the specified range
• RoHS and REACH compliance: Enhanced compliance is acceptable

The LTV-357T meets all mandatory matching parameters and demonstrates improved performance in several allowable variation categories.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: LTV-357T

The LTV-357T is the qualified substitute for PS2761-1 applications based on the following engineering criteria:

1. Functional Equivalence: Identical isolation voltage (3750Vrms), channel count (1), output type (transistor), and package configuration (4-SMD, Gull Wing) ensure direct functional compatibility.

2. Performance Enhancement: The LTV-357T demonstrates improved performance in multiple parameters: higher maximum current transfer ratio (600% vs. 400%), increased output current capability (50mA vs. 40mA), lower saturation voltage (200mV vs. 300mV), and faster fall time (3µs vs. 5µs).

3. Product Status: LTV-357T is actively manufactured and stocked, eliminating supply chain risk associated with the obsolete PS2761-1.

4. Regulatory Compliance: LTV-357T achieves ROHS3 compliance and REACH unaffected status, whereas PS2761-1 is non-compliant and REACH affected. This substitution improves regulatory standing for new designs and manufacturing.

5. Temperature Range: Extended operating temperature range (-55°C to 110°C vs. -55°C to 100°C) provides additional thermal margin for demanding applications.

6. Output Voltage Consideration: The LTV-357T maximum output voltage is 35V compared to 40V for PS2761-1. Verify that application circuits operate within 35V maximum to ensure compatibility.

Frequently Asked Questions (FAQ)

Q1: Can LTV-357T directly replace PS2761-1 in existing designs without circuit modification?

A: Yes, for most applications. Both components share identical isolation voltage, channel configuration, output type, and package. However, verify that your circuit design does not depend on the 40V maximum output voltage specification of PS2761-1, as LTV-357T is rated to 35V maximum. If your application requires operation above 35V, circuit modification is necessary.

Q2: What are the key differences between PS2761-1 and LTV-357T?

A: The primary differences are: (1) LTV-357T is actively manufactured while PS2761-1 is obsolete; (2) LTV-357T has improved saturation voltage (200mV vs. 300mV) and faster fall time (3µs vs. 5µs); (3) LTV-357T supports higher output current (50mA vs. 40mA); (4) LTV-357T has lower maximum output voltage (35V vs. 40V); (5) LTV-357T achieves ROHS3 compliance and REACH unaffected status.

Q3: Are there any compatibility concerns with the 4-SOP package between these two parts?

A: No. Both PS2761-1 and LTV-357T use identical 4-SMD, Gull Wing package configuration with 2.54mm pitch. PCB footprints and reflow soldering profiles are compatible.

Q4: What is the impact of LTV-357T's lower maximum output voltage (35V vs. 40V)?

A: Applications operating at or below 35V output voltage experience no impact. If your design requires output voltages between 35V and 40V, the LTV-357T cannot be used without circuit redesign. Verify your application's maximum output voltage requirement before substitution.

Q5: Does the improved current transfer ratio of LTV-357T (600% max vs. 400% max) affect circuit design?

A: Higher current transfer ratio indicates improved efficiency in converting input current to output current. This is a performance enhancement that does not negatively affect circuit compatibility. Circuits designed for PS2761-1 will function with LTV-357T without modification.

Q6: What is the significance of ROHS3 compliance and REACH unaffected status for LTV-357T?

A: ROHS3 compliance indicates the component meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. REACH unaffected status means the component does not contain substances of very high concern requiring authorization. These certifications are mandatory for many markets and applications, particularly in Europe and regulated industries. Substituting PS2761-1 (non-compliant, REACH affected) with LTV-357T eliminates regulatory compliance barriers.

Q7: Can PS2761-1 be used as a substitute for LTV-357T?

A: No. PS2761-1 is obsolete and non-compliant with current regulatory standards. New designs should not incorporate obsolete components. Existing designs using PS2761-1 should transition to LTV-357T for long-term supply security and regulatory compliance.