PS2502-2 Equivalent & Substitute Parts

Part Overview

The PS2502-2 is a Darlington output optoisolator manufactured by CEL, rated for 5000Vrms isolation voltage with 2 channels in an 8-DIP package. This component is classified as obsolete, making the identification of suitable substitute parts essential for new designs and legacy system support. The optoisolator family shares standardized electrical and mechanical interfaces that permit functional substitution based on isolation voltage, channel configuration, output type, and package compatibility.

Substiute Parts

PS2502-2

CELIn Stock: 3352PS2502-2 Datasheet

Current PartRFQ

ILD55

Vishay Semiconductor Opto DivisionIn Stock: 2671ILD55 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the PS2502-2 optoisolator is determined by compatibility across five critical parameters: number of channels, isolation voltage rating, output type, package configuration, and operating temperature range. The PS2502-2 operates with 2 channels, Darlington output topology, 8-DIP through-hole mounting, and a temperature range of -55°C to 100°C.

A suitable substitute must maintain identical channel count (2), identical output type (Darlington), identical package format (8-DIP through-hole), and compatible operating temperature range. The isolation voltage and current transfer characteristics may vary within specified limits, provided the substitute meets or exceeds the application's isolation and current requirements.

Parameter Comparison

Engineering Selection Recommendations

The ILD55 optoisolator, manufactured by Vishay Semiconductor Opto Division, is a functionally compatible substitute for the obsolete PS2502-2. Both components share identical 2-channel Darlington output configuration, 8-DIP through-hole package format, and operating temperature specification (-55°C to 100°C).

The ILD55 provides higher isolation voltage (5300Vrms vs. 5000Vrms) and superior rise/fall time performance (10µs/35µs vs. 100µs/100µs), enabling faster switching applications. However, the ILD55 delivers lower output current per channel (125mA vs. 160mA) and lower current transfer ratio specification (100% @ 10mA vs. 200% @ 1mA), necessitating verification of input drive compatibility with the 10mA minimum specification.

The ILD55 carries ROHS3 compliance status, whereas the PS2502-2 is RoHS non-compliant, making the ILD55 suitable for applications with regulatory compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the ILD55 directly replace the PS2502-2 in existing designs? A: The ILD55 is pin-compatible with the PS2502-2 due to identical 8-DIP package format. Functional compatibility depends on application-specific requirements. The ILD55 output current specification (125mA) is lower than the PS2502-2 (160mA); applications requiring maximum output current near 160mA must be re-evaluated. Additionally, the ILD55 current transfer ratio is specified at 10mA input, while the PS2502-2 is specified at 1mA input; verify that the driving circuit provides adequate input current.

Q: What are the key parameter differences between these two optoisolators? A: Both components are 2-channel Darlington output optoisolators in 8-DIP packages. The ILD55 offers higher isolation voltage (5300Vrms vs. 5000Vrms) and significantly faster switching (10µs/35µs rise/fall time vs. 100µs/100µs). The PS2502-2 provides higher output current per channel (160mA vs. 125mA) and higher current transfer ratio at lower input current (200% @ 1mA vs. 100% @ 10mA).

Q: Does the RoHS compliance difference affect substitutability? A: The ILD55 is ROHS3 compliant while the PS2502-2 is RoHS non-compliant. For applications with RoHS compliance requirements, the ILD55 qualifies as the preferred substitute. For legacy or non-regulated applications, RoHS status does not affect electrical or mechanical compatibility.

Q: Is package compatibility guaranteed for PCB assembly? A: Yes. Both the PS2502-2 and ILD55 utilize the 8-DIP (0.300", 7.62mm) through-hole package format. Pin footprints, spacing, and hole diameters are identical, permitting direct mechanical substitution in through-hole assembly processes without PCB redesign.

Q: Why does the PS2502-2 require substitution? A: The PS2502-2 is classified as obsolete, indicating that the manufacturer (CEL) has discontinued production and does not maintain inventory. The ILD55 maintains Last Time Buy status and active inventory, ensuring continued availability for new designs and field service applications.