PS2501-1 Optoisolator Equivalent & Substitute Parts

Part Overview

The PS2501-1 is a 5000Vrms isolation optoisolator with transistor output in 4-DIP package configuration, manufactured by CEL. This component features single-channel isolation suitable for DC input applications with 50mA output current capability. The PS2501-1 holds obsolete product status, necessitating identification of functionally equivalent alternatives for ongoing system support and new design implementations. Substitute parts must maintain electrical compatibility across isolation voltage, output characteristics, and thermal operating range parameters.

Key Parameters

Parameter	Value	Unit	Significance for Substitution
Voltage - Isolation	5000	Vrms	Primary isolation specification; substitutes must meet or exceed this rating
Number of Channels	1	Channel	Functional requirement; all substitutes must be single-channel
Output Type	Transistor	-	Output configuration; substitutes must use transistor output topology
Current - Output / Channel	50	mA	Maximum output current; substitutes must support this level
Voltage - Output (Max)	80	V	Maximum collector voltage; critical for circuit compatibility
Package / Case	4-DIP (0.300", 7.62mm)	-	Physical form factor; must match for direct board replacement
Operating Temperature	-55 to 100	°C	Thermal operating range; substitutes must cover application temperature requirements
Mounting Type	Through Hole	-	Assembly method; all substitutes use through-hole mounting

Substitute Part Grouping Explanation

Substitute parts for the PS2501-1 are classified based on strict adherence to the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - Isolation: minimum 5000Vrms (5300Vrms acceptable as higher rating)
Number of Channels: exactly 1 channel
Output Type: transistor output configuration
Current - Output / Channel: minimum 50mA capability
Package / Case: 4-DIP (0.300", 7.62mm) form factor
Mounting Type: through-hole technology
Input Type: DC input

Secondary Compatibility Factors:

Voltage - Output (Max): must accommodate circuit requirements (80V primary specification)
Operating Temperature Range: must include application operating points
Current Transfer Ratio: performance parameter affecting switching characteristics
Vce Saturation: affects output voltage drop and power dissipation

Parts are grouped into two categories: Direct Substitutes (matching all primary criteria with identical or superior electrical performance) and Similar Substitutes (meeting primary criteria with minor parameter variations requiring application verification).

Parameter Comparison

Parameter	PS2501-1 (Main)	PS2501-1-A	OCP-PCT114/E	HCPL-817-00BE	LTV-816	SFH615A-4
Manufacturer	CEL	Renesas Electronics	Lumex Opto/Components	Broadcom Limited	Lite-On Inc.	Vishay Semiconductor
Product Status	Obsolete	Not For New Designs	Active	Active	Active	Active
Voltage - Isolation (Vrms)	5000	5000	5000	5000	5000	5300
Number of Channels	1	1	1	1	1	1
Current Transfer Ratio (Min)	80% @ 5mA	80% @ 5mA	60% @ 2mA	130% @ 5mA	50% @ 5mA	160% @ 10mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 2mA	260% @ 5mA	600% @ 5mA	320% @ 10mA
Rise / Fall Time (Typ)	3µs, 5µs	3µs, 5µs	5µs, 4µs	4µs, 3µs	4µs, 3µs	2µs, 2µs
Voltage - Output (Max)	80V	80V	60V	70V	80V	70V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.17V	1.17V	1.2V	1.2V	1.2V	1.35V
Current - DC Forward (If) (Max)	80mA	80mA	50mA	50mA	50mA	60mA
Vce Saturation (Max)	300mV	300mV	300mV	200mV	200mV	400mV
Operating Temperature	-55 to 100°C	-55 to 100°C	-30 to 100°C	-30 to 100°C	-30 to 110°C	-55 to 100°C
Package / Case	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

PS2501-1-A (Renesas Electronics Corporation) provides direct electrical equivalence to the PS2501-1 with identical isolation voltage (5000Vrms), current transfer ratio specifications (80% to 600% @ 5mA), output voltage rating (80V), and operating temperature range (-55 to 100°C). This part maintains the NEPOC series designation and through-hole 4-DIP package. Product status is "Not For New Designs," indicating limited long-term availability. RoHS3 compliance and REACH unaffected status support regulatory requirements for new applications.

Active Substitutes (Recommended for New Designs):

LTV-816 (Lite-On Inc.) meets all primary substitution criteria with 5000Vrms isolation, 50mA output current, and 4-DIP package configuration. Operating temperature range extends to 110°C, providing enhanced thermal margin. Current transfer ratio minimum of 50% @ 5mA is lower than the PS2501-1 specification but remains within acceptable performance envelope. Vce saturation of 200mV improves upon the 300mV specification. Active product status with RoHS3 compliance and REACH unaffected designation supports long-term design implementation.

HCPL-817-00BE (Broadcom Limited) provides 5000Vrms isolation with superior current transfer ratio performance (130% to 260% @ 5mA). Output voltage maximum of 70V is lower than the PS2501-1 specification; circuit designs requiring the full 80V output capability must account for this limitation. Vce saturation of 200mV reduces power dissipation. Active product status with RoHS3 compliance supports new design adoption.

Alternative Substitutes (Application-Dependent Selection):

OCP-PCT114/E (Lumex Opto/Components Inc.) maintains 5000Vrms isolation and 50mA output current in 4-DIP package. Output voltage maximum of 60V represents the most restrictive specification among substitutes; applications requiring higher output voltage must be evaluated against this limitation. Current transfer ratio minimum of 60% @ 2mA differs from the PS2501-1 test condition. Active product status with RoHS3 compliance supports new implementations.

SFH615A-4 (Vishay Semiconductor Opto Division) provides enhanced isolation voltage of 5300Vrms with superior switching speed characteristics (2µs rise/fall time). Current transfer ratio specifications (160% to 320% @ 10mA) are measured at different test conditions than the PS2501-1. Vce saturation of 400mV exceeds the PS2501-1 specification, increasing output voltage drop. Operating temperature range matches the PS2501-1 (-55 to 100°C). Active product status with RoHS3 compliance supports new design adoption.

Selection Criteria Summary:

Regulatory Compliance: All active substitutes provide RoHS3 compliance; PS2501-1-A offers compliance path for legacy system updates
Product Availability: LTV-816, HCPL-817-00BE, OCP-PCT114/E, and SFH615A-4 maintain active status for ongoing procurement
Thermal Requirements: LTV-816 extends operating range to 110°C; SFH615A-4 and PS2501-1-A maintain -55°C lower limit
Output Voltage Compatibility: LTV-816 and PS2501-1-A support full 80V specification; HCPL-817-00BE and OCP-PCT114/E have reduced maximum ratings
Switching Performance: SFH615A-4 offers fastest switching characteristics; PS2501-1-A and LTV-816 maintain original timing specifications

Frequently Asked Questions (FAQ)

Q: Can PS2501-1-A be used as a direct replacement for PS2501-1?

A: PS2501-1-A provides electrical equivalence across all primary parameters: 5000Vrms isolation, 80% to 600% current transfer ratio @ 5mA, 80V maximum output voltage, 50mA output current, and -55 to 100°C operating range. Physical package (4-DIP through-hole) enables direct board substitution. Product status "Not For New Designs" indicates limited future availability; this part is suitable for legacy system maintenance but not recommended for new design implementations.

Q: What is the primary limitation of OCP-PCT114/E as a substitute?

A: OCP-PCT114/E reduces maximum output voltage from 80V to 60V. Applications requiring output voltage operation above 60V must be evaluated for compatibility. Current transfer ratio minimum of 60% @ 2mA differs from the PS2501-1 test condition of 80% @ 5mA. These parameters do not affect applications operating within the 60V output range with adequate input current drive.

Q: How does HCPL-817-00BE differ in switching performance?

A: HCPL-817-00BE specifies rise time of 4µs and fall time of 3µs, compared to PS2501-1 specifications of 3µs rise and 5µs fall. The faster fall time (3µs versus 5µs) may affect circuit timing in applications with critical switching edge requirements. Current transfer ratio range of 130% to 260% @ 5mA is narrower than PS2501-1 specification of 80% to 600%, providing more consistent gain characteristics.

Q: Is LTV-816 suitable for high-temperature applications?

A: LTV-816 extends operating temperature range to 110°C maximum, compared to PS2501-1 specification of 100°C. This provides 10°C additional thermal margin for applications approaching the upper temperature limit. Lower operating temperature limit of -30°C (versus PS2501-1 specification of -55°C) restricts use in extreme cold environments.

Q: What are the isolation voltage differences among substitutes?

A: All substitutes maintain minimum 5000Vrms isolation voltage specification. SFH615A-4 provides enhanced isolation rating of 5300Vrms. This higher rating does not affect circuit compatibility; applications designed for 5000Vrms isolation operate safely with 5300Vrms-rated components.

Q: Can SFH615A-4 be used in applications requiring fast switching?

A: SFH615A-4 provides the fastest switching characteristics among substitutes with 2µs rise time and 2µs fall time, compared to PS2501-1 specifications of 3µs and 5µs. This enhanced speed supports applications with higher switching frequency requirements. Current transfer ratio specifications (160% to 320% @ 10mA) are measured at different test conditions; circuit designs must account for this performance characteristic.

Q: What packaging considerations apply to all substitutes?

A: All substitute parts maintain 4-DIP (0.300", 7.62mm) through-hole package configuration, enabling direct physical replacement on existing printed circuit boards. Pin assignments and functional configuration remain consistent across all parts. No board layout modifications are required for package compatibility.

Q: Are there RoHS compliance differences between substitutes?

A: PS2501-1 is RoHS non-compliant. All substitute parts (PS2501-1-A, OCP-PCT114/E, HCPL-817-00BE, LTV-816, SFH615A-4) are RoHS3 compliant. This compliance status supports regulatory requirements for new product designs and system updates in regulated markets.

Q: How do forward voltage specifications affect circuit design?

A: PS2501-1 specifies typical forward voltage of 1.17V with maximum DC forward current of 80mA. Substitutes range from 1.2V to 1.35V forward voltage with maximum forward currents of 50mA to 60mA. Input circuit designs must accommodate these variations in LED drive requirements. Higher forward voltage (SFH615A-4 at 1.35V) requires increased input current for equivalent optical coupling efficiency.

Q: What is the significance of current transfer ratio test conditions?

A: Current transfer ratio specifications vary by test condition across parts. PS2501-1 specifies 80% to 600% @ 5mA input current. OCP-PCT114/E specifies 60% to 600% @ 2mA, and SFH615A-4 specifies 160% to 320% @ 10mA. These variations reflect different LED drive points and output transistor gain characteristics. Circuit designs must verify that input drive current and output load conditions align with the selected part's test specifications.

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