PS2501L-4 Optoisolator Equivalent & Substitute Parts

Part Overview

The PS2501L-4 is a 5000Vrms optoisolator with transistor output, 4-channel configuration, and 16-SMD surface mount packaging. Manufactured by CEL with NEPOC series designation, this component features a current transfer ratio of 80% minimum at 5mA and supports 50mA output current per channel. The product is marked as obsolete, necessitating evaluation of active alternative components that maintain electrical and mechanical compatibility with existing designs.

Key Parameters

Parameter	Specification
Voltage - Isolation	5000Vrms
Number of Channels	4
Current Transfer Ratio (Min)	80% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Package / Case	16-SMD, Gull Wing
Operating Temperature Range	-55°C ~ 100°C
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the PS2501L-4 is determined by the following critical parameters:

Voltage - Isolation: 5000Vrms (all substitutes must match)
Number of Channels: 4 (all substitutes must match)
Output Type: Transistor (all substitutes must match)
Package / Case: 16-SMD, Gull Wing (all substitutes must match)
Mounting Type: Surface Mount (all substitutes must match)
Current Transfer Ratio (Min): 60% or higher @ 2mA - 5mA (acceptable range for functional compatibility)
Voltage - Output (Max): 60V or higher (acceptable for 80V rated applications)
Current - Output / Channel: 50mA (all substitutes must match)
Operating Temperature Range: Minimum -30°C acceptable for designs not requiring extended -55°C operation

The PS2501L-4-A (Renesas Electronics Corporation) provides direct parametric equivalence. The OCP-PCT4116/E-TR (Lumex Opto/Components Inc.) offers functional substitution with minor parameter variations within acceptable tolerance ranges for most applications.

Parameter Comparison

Parameter	PS2501L-4 (CEL)	PS2501L-4-A (Renesas)	OCP-PCT4116/E-TR (Lumex)
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms
Number of Channels	4	4	4
Current Transfer Ratio (Min)	80% @ 5mA	80% @ 5mA	60% @ 2mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 2mA
Rise / Fall Time (Typ)	3µs, 5µs	3µs, 5µs	5µs, 4µs
Output Type	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	60V
Current - Output / Channel	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.17V	1.17V	1.2V
Current - DC Forward (If) (Max)	80 mA	80 mA	50 mA
Vce Saturation (Max)	300mV	300mV	300mV
Operating Temperature Range	-55°C ~ 100°C	-55°C ~ 100°C	-30°C ~ 100°C
Package / Case	16-SMD, Gull Wing	16-SMD, Gull Wing	16-SMD, Gull Wing
Product Status	Obsolete	Not For New Designs	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent: PS2501L-4-A (Renesas Electronics Corporation) provides identical electrical specifications and operating temperature range. This part maintains the 80% current transfer ratio at 5mA and 80V maximum output voltage of the original PS2501L-4. However, the Renesas part is marked "Not For New Designs," indicating limited availability for future production allocation. Both the CEL original and Renesas variant are non-compliant or conditionally compliant with current RoHS standards.

Active Alternative: OCP-PCT4116/E-TR (Lumex Opto/Components Inc.) is the only actively manufactured substitute with ROHS3 compliance and REACH unaffected status. This part accepts designs with the following parameter variations:

Reduced maximum output voltage (60V versus 80V)
Lower minimum current transfer ratio (60% @ 2mA versus 80% @ 5mA)
Restricted operating temperature range (-30°C to 100°C versus -55°C to 100°C)
Lower maximum DC forward current (50mA versus 80mA)

The OCP-PCT4116/E-TR is suitable for applications where the reduced output voltage and operating temperature range do not conflict with design requirements and where RoHS3 compliance is mandated.

Frequently Asked Questions (FAQ)

Q: Can I use PS2501L-4-A as a direct replacement for PS2501L-4? A: Yes. The PS2501L-4-A provides identical electrical and mechanical specifications, including the same 80% minimum current transfer ratio, 80V maximum output voltage, and -55°C to 100°C operating range. It is packaged in 16-SMD gull wing configuration matching the original. Note that it carries "Not For New Designs" status.

Q: What are the limitations of using OCP-PCT4116/E-TR as a substitute? A: The OCP-PCT4116/E-TR operates within a narrower temperature range (-30°C to 100°C), has a lower maximum output voltage (60V), and a lower minimum current transfer ratio (60% at 2mA). Applications operating below -30°C or requiring output voltages above 60V are not compatible with this substitute.

Q: Does the OCP-PCT4116/E-TR affect RoHS compliance? A: No. The OCP-PCT4116/E-TR is ROHS3 compliant and REACH unaffected, making it suitable for applications with environmental and regulatory compliance requirements. The original PS2501L-4 is RoHS non-compliant.

Q: Are there electrical performance differences in switching speed? A: The OCP-PCT4116/E-TR has rise/fall times of 5µs and 4µs compared to the PS2501L-4's 3µs and 5µs. Applications sensitive to switching performance should verify that the 2µs difference in rise time does not exceed design tolerances.

Q: Can I mix PS2501L-4 and OCP-PCT4116/E-TR parts in the same production batch? A: Parts may be used interchangeably only when both design parameters (maximum output voltage 60V and minimum operating temperature -30°C) and electrical performance characteristics (60% current transfer ratio) are acceptable for your application. Mixed sourcing should be evaluated on a circuit-by-circuit basis.

Q: What is the packaging difference between these parts? A: All three parts use 16-SMD gull wing surface mount packaging with identical pinouts and board footprints, enabling mechanical interchangeability without PCB redesign.

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