PS2561-1 Optoisolator - Equivalent & Substitute Parts

Part Overview

The PS2561-1 is a 5000Vrms isolation optoisolator with transistor output in a 4-DIP package, designed for high-voltage signal isolation applications. Manufactured by CEL, this component features a single channel configuration with 50mA output current capability. The PS2561-1 is classified as Obsolete, necessitating identification of equivalent substitute components for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	PS2561-1
Manufacturer	CEL
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Package / Case	4-DIP (0.300", 7.62mm)
Output Type	Transistor
Current - Output / Channel	50mA
Voltage - Output (Max)	80V
Operating Temperature Range	-55°C ~ 100°C
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute components for the PS2561-1 are identified based on electrical and mechanical parameter alignment. The critical parameters determining substitution compatibility are:

Isolation Voltage: 5000Vrms (primary isolation requirement)
Output Configuration: Transistor output with single channel
Package Format: 4-DIP (0.300", 7.62mm) through-hole
Output Current Capability: 50mA per channel
Maximum Output Voltage: 80V
Input Type: DC

Two substitute options are available: the LTV-816 manufactured by Lite-On Inc. and the PS2561-1-A manufactured by Renesas Electronics Corporation. Both components meet the fundamental electrical and mechanical specifications of the original PS2561-1.

Parameter Comparison

Parameter	PS2561-1 (Original)	PS2561-1-A (Renesas)	LTV-816 (Lite-On)
Manufacturer Part Number	PS2561-1	PS2561-1-A	LTV-816
Manufacturer	CEL	Renesas Electronics Corporation	Lite-On Inc.
Number of Channels	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	80% @ 5mA	80% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	400% @ 5mA	400% @ 5mA	600% @ 5mA
Rise / Fall Time (Typ)	3µs, 5µs	3µs, 5µs	4µs, 3µs
Output Type	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V
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	200mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-30°C ~ 110°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)
Supplier Device Package	4-DIP	4-DIP	4-DIP
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Affected	REACH Affected	REACH Unaffected
Product Status	Obsolete	Not For New Designs	Active
Inventory Availability	27991 Pcs	26300 Pcs	45400 Pcs

Engineering Selection Recommendations

PS2561-1-A (Renesas Electronics Corporation) provides parametric equivalence to the original PS2561-1 with identical electrical characteristics. This component shares the NEPOC series designation and maintains exact specifications for isolation voltage, current transfer ratio, output voltage, and saturation characteristics. However, the PS2561-1-A is classified as "Not For New Designs," indicating Renesas has discontinued active support. This option is suitable for legacy system maintenance and replacement applications only. RoHS3 compliance and REACH affected status should be evaluated against your procurement requirements.

LTV-816 (Lite-On Inc.) is an active product offering functional substitution with some parameter variations. The LTV-816 maintains the critical isolation voltage and package compatibility while providing superior lower saturation voltage (200mV vs. 300mV) and extended operating temperature range (-30°C ~ 110°C). Current Transfer Ratio minimum is lower (50% vs. 80%), but maximum is higher (600% vs. 400%). Input current maximum is reduced to 50mA versus the original's 80mA. The LTV-816 is ROHS3 compliant and REACH unaffected, meeting modern compliance requirements. Active manufacturing status ensures long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the PS2561-1 be directly replaced with either substitute part?

A: Both the PS2561-1-A and LTV-816 share identical package format (4-DIP through-hole) and isolation voltage (5000Vrms), enabling direct pin-compatible replacement. Electrical parameter variations require circuit-level validation, particularly regarding current transfer ratio ranges and saturation voltage.

Q: What is the difference between parametric equivalence and functional substitution?

A: The PS2561-1-A is a parametric equivalent, matching all primary electrical specifications of the original PS2561-1. The LTV-816 is a functional substitute meeting isolation voltage and package requirements but with variations in current transfer ratio range, saturation voltage, and input current rating.

Q: Which substitute is recommended for new designs?

A: The LTV-816 is the only active product among the options presented. The PS2561-1-A is marked "Not For New Designs." Product status and availability should be primary selection criteria for new design implementations.

Q: Are there compliance differences between the substitutes?

A: Yes. The PS2561-1 is RoHS non-compliant and REACH affected. Both the PS2561-1-A and LTV-816 are RoHS3 compliant. The LTV-816 additionally offers REACH unaffected status, simplifying regulatory compliance for EU applications.

Q: What packaging is used for these components?

A: All three components—PS2561-1, PS2561-1-A, and LTV-816—use identical 4-DIP (0.300", 7.62mm) through-hole packaging, enabling straightforward footprint compatibility and mechanical interchangeability on printed circuit boards.

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