PS2761-1-A Optoisolator Equivalent & Substitute Parts

Part Overview

The PS2761-1-A 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 current inventory, 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 specifications and active product status.

Substiute Parts

PS2761-1-A

CELIn Stock: 835PS2761-1-A 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-A 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 footprint compatibility)
• Mounting Type: Surface Mount (assembly process 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 equal to or exceed 40mA
• Vce Saturation (Max): Substitute may be lower or equal to 300mV
• Operating Temperature Range: Substitute may equal or exceed the specified range
• Product Status: Active status preferred for long-term availability

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

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: LTV-357T

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

Functional Equivalence: All mandatory electrical parameters match exactly: 3750Vrms isolation voltage, single-channel configuration, transistor output topology, and identical DC input type. Physical compatibility is confirmed through matching 4-SMD Gull Wing package and surface mount mounting type.

Performance Enhancement: The LTV-357T demonstrates improved performance in multiple allowable variation categories: maximum current transfer ratio increased from 400% to 600%, output current capacity increased from 40mA to 50mA, Vce saturation reduced from 300mV to 200mV, and fall time improved from 5µs to 3µs. Operating temperature range extended from 100°C to 110°C maximum.

Product Status and Compliance: The LTV-357T holds active product status with current manufacturing availability (10,099 pcs in stock), ensuring long-term supply chain continuity. The substitute carries ROHS3 compliance certification and REACH unaffected status, providing superior regulatory compliance compared to the obsolete PS2761-1-A.

Design Consideration: The LTV-357T maximum output voltage rating of 35V is lower than the PS2761-1-A specification of 40V. Applications requiring output voltages exceeding 35V must be evaluated for compatibility. All other electrical parameters support direct substitution without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the LTV-357T directly replace the PS2761-1-A in existing designs?

A: The LTV-357T is electrically and mechanically compatible for direct substitution in applications where the output voltage requirement does not exceed 35V. The identical isolation voltage (3750Vrms), channel count (1), package type (4-SMD Gull Wing), and output topology (transistor) confirm pin-level and functional compatibility. Verify that your application output voltage specification does not exceed 35V before implementing the substitution.

Q: What are the key differences between these two optoisolators?

A: The primary differences are product status (PS2761-1-A is obsolete; LTV-357T is active), maximum output voltage (40V versus 35V), output current capacity (40mA versus 50mA), Vce saturation (300mV versus 200mV), and regulatory compliance (REACH Affected versus REACH Unaffected). The LTV-357T provides improved performance specifications and superior compliance status.

Q: Are there any package or pinout differences?

A: Both components use identical 4-SMD Gull Wing packages with surface mount configuration. No pinout modifications are required for substitution. Physical footprint compatibility is confirmed.

Q: Why is the PS2761-1-A classified as obsolete?

A: The PS2761-1-A is listed as obsolete by the manufacturer CEL. The LTV-357T from Lite-On Inc. represents the active equivalent product for new designs and procurement planning.

Q: What compliance certifications apply to each part?

A: The PS2761-1-A is REACH Affected with no RoHS status specified. The LTV-357T is ROHS3 Compliant and REACH Unaffected, providing superior regulatory compliance for applications subject to environmental and hazardous substance restrictions.

Q: Can the LTV-357T handle higher output currents than the PS2761-1-A?

A: Yes. The LTV-357T is rated for 50mA maximum output current per channel, compared to 40mA for the PS2761-1-A. This represents a 25% increase in output current capacity, allowing operation in applications requiring higher output drive capability.

Q: What is the impact of the lower Vce saturation in the LTV-357T?

A: The reduced Vce saturation (200mV versus 300mV) in the LTV-357T results in lower power dissipation and improved switching efficiency. This represents an engineering improvement that benefits thermal performance and overall circuit efficiency.