PS2501-2 Equivalent & Substitute Parts

Part Overview

The PS2501-2 is a 5000Vrms rated optoisolator with 2-channel transistor output in an 8-DIP package manufactured by CEL. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The PS2501-2 series belongs to the NEPOC optoisolator family and is currently non-compliant with RoHS standards.

Key Parameters

Parameter	PS2501-2 Specification
Manufacturer	CEL
Package Type	8-DIP (0.300", 7.62mm)
Number of Channels	2
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	80% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Vce Saturation (Max)	300mV
Operating Temperature Range	-55°C to 100°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the PS2501-2 is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-DIP (0.300", 7.62mm) mounting configuration to ensure direct form-factor compatibility with existing PCB layouts.

Electrical Performance: Substitutes must maintain isolation voltage rating at or above 5000Vrms and support 2-channel transistor output configuration. Current transfer ratio characteristics must accommodate the application's forward bias current requirements.

Output Specifications: Maximum output voltage and per-channel current must meet or exceed application demands. Vce saturation characteristics determine switching performance and power dissipation in the application circuit.

Operating Temperature: The -55°C to 100°C operating range is the baseline for compatibility assessment. Substitutes meeting this range maintain thermal performance parity.

Environmental & Compliance Status: RoHS and REACH compliance status are evaluated to address supply chain and regulatory requirements.

Parameter Comparison

Parameter	PS2501-2 (CEL)	OCP-PCT218/E (Lumex)	ILD621GB (Vishay)	MCT9001 (onsemi)
Voltage - Isolation	5000Vrms	5000Vrms	5300Vrms	5000Vrms
Number of Channels	2	2	2	2
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Current Transfer Ratio (Min)	80% @ 5mA	60% @ 2mA	100% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 2mA	600% @ 5mA	600% @ 5mA
Voltage - Output (Max)	80V	60V	70V	55V
Current - Output / Channel	50mA	50mA	50mA	30mA
Vce Saturation (Max)	300mV	300mV	400mV	400mV
Operating Temperature Range	-55°C to 100°C	-30°C to 100°C	-55°C to 100°C	-55°C to 100°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

OCP-PCT218/E (Lumex Opto/Components Inc.) provides direct substitution for applications with operating temperature constraints at or above -30°C. This part achieves ROHS3 compliance and maintains active production status. The 60V maximum output voltage and 50mA per-channel current rating are suitable for standard isolation circuit applications. Note that the minimum current transfer ratio of 60% @ 2mA differs from the PS2501-2 specification, requiring design validation when forward bias current is below 5mA.

ILD621GB (Vishay Semiconductor Opto Division) is a pin-compatible alternative suitable for applications requiring extended low-temperature operation (-55°C minimum). The 5300Vrms isolation rating exceeds PS2501-2 specifications, providing margin for high-voltage applications. This part demonstrates ROHS3 compliance and maintains active production status with high inventory availability. The maximum Vce saturation of 400mV represents a tolerance difference relative to the PS2501-2.

MCT9001 (onsemi) supports the full -55°C to 100°C temperature range with ROHS3 compliance and active product status. Maximum output voltage is rated at 55V and per-channel current at 30mA, which are below PS2501-2 ratings. Selection of this part requires application validation to confirm sufficient output current headroom, particularly in circuits designed for 50mA output capability.

All three substitutes are RoHS3 compliant and maintain active production status, addressing supply chain continuity and regulatory compliance relative to the obsolete PS2501-2.

Frequently Asked Questions (FAQ)

Q: Can I directly replace PS2501-2 with any of these substitute parts?

A: All three substitutes use identical 8-DIP packaging and support 2-channel transistor output with 5000Vrms isolation or higher, enabling direct socket replacement. However, application-specific parameter validation is required for circuits operating near the maximum ratings of output voltage or current.

Q: Which substitute is best for applications requiring full temperature range operation?

A: Both ILD621GB and MCT9001 support the full -55°C to 100°C operating range. OCP-PCT218/E is limited to -30°C minimum temperature and is unsuitable for applications requiring extended low-temperature operation.

Q: What is the significance of current transfer ratio specifications at different forward bias currents?

A: Current transfer ratio varies with input forward bias current. OCP-PCT218/E specifies performance at 2mA while PS2501-2 and the remaining substitutes specify at 5mA. Applications with input bias currents below 5mA require validation against the specific current transfer ratio curve for the selected part.

Q: Are there output current limitations I should consider?

A: MCT9001 is rated for 30mA per-channel output current versus 50mA for the PS2501-2, OCP-PCT218/E, and ILD621GB. Applications designed for 50mA output capability should use OCP-PCT218/E or ILD621GB to maintain specification margin. ILD621GB provides the highest isolation voltage rating at 5300Vrms.

Q: Do all substitutes meet RoHS compliance requirements?

A: Yes. OCP-PCT218/E, ILD621GB, and MCT9001 are all ROHS3 compliant, supporting modern supply chain and regulatory requirements. The original PS2501-2 is non-compliant with current RoHS standards.

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