PS2765-1 Optoisolator Equivalent & Substitute Parts

Part Overview

The PS2765-1 is a single-channel optoisolator with transistor output manufactured by CEL, rated for 3750Vrms isolation voltage. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement. The PS2765-1 features AC/DC input capability, 40V maximum output voltage, and 40mA output current per channel, housed in a 4-SOP surface mount package. Due to its obsolete status, equivalent active parts are required to maintain design continuity and ensure long-term component availability.

Key Parameters

Parameter	Value
Isolation Voltage	3750Vrms
Number of Channels	1
Output Type	Transistor
Input Type	AC, DC
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	400% @ 5mA
Voltage - Output (Max)	40V
Current - Output / Channel	40mA
Vce Saturation (Max)	300mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PS2765-1 optoisolator is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Isolation voltage: 3750Vrms (exact match required)
Number of channels: 1 (single channel)
Output type: Transistor
Input type: AC, DC capability
Mounting type: Surface Mount
Package classification: 4-SMD, Gull Wing configuration
Moisture sensitivity: MSL 1 (Unlimited)

Secondary Compatibility Parameters:

Current Transfer Ratio range: minimum 50% and maximum 300-400% at specified test currents
Maximum output voltage: 40V or greater
Maximum output current: 40mA or greater per channel
Vce saturation: 300mV or lower
Operating temperature range: must encompass or exceed -55°C to 100°C

All identified substitute parts meet these core criteria. Variations in rise/fall time, forward voltage, and specific CTR test conditions are documented but do not preclude substitution when the primary parameters align.

Parameter Comparison

Parameter	PS2765-1 (CEL)	FODM2705R2 (onsemi)	HCPL-354-000E (Broadcom)	LTV-354T (Lite-On)
Isolation Voltage	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Number of Channels	1	1	1	1
Output Type	Transistor	Transistor	Transistor	Transistor
Input Type	AC, DC	AC, DC	AC, DC	AC, DC
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	20% @ 1mA	20% @ 1mA
Current Transfer Ratio (Max)	400% @ 5mA	300% @ 5mA	400% @ 1mA	400% @ 1mA
Voltage - Output (Max)	40V	40V	35V	35V
Current - Output / Channel	40mA	80mA	50mA	50mA
Vce Saturation (Max)	300mV	300mV	200mV	200mV
Voltage - Forward (Vf) (Typ)	1.1V	1.4V (Max)	1.2V	1.2V
Rise / Fall Time (Typ)	4µs, 5µs	3µs, 3µs	4µs, 3µs	4µs, 3µs
Operating Temperature	-55°C ~ 100°C	-40°C ~ 110°C	-55°C ~ 100°C	-30°C ~ 110°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Affected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

FODM2705R2 (onsemi): This part is recommended as the primary substitute for the PS2765-1. It maintains identical isolation voltage (3750Vrms), current transfer ratio specifications at 5mA test conditions, and package configuration. The FODM2705R2 offers superior output current capability (80mA versus 40mA), faster switching times (3µs rise/fall versus 4µs/5µs), and extended upper operating temperature (110°C versus 100°C). The part is ROHS3 compliant and REACH unaffected, addressing regulatory compliance gaps in the obsolete PS2765-1. Packaging is Tape & Reel (TR), suitable for automated assembly.

HCPL-354-000E (Broadcom Limited): This part provides functional equivalence with identical isolation voltage and single-channel transistor output. The HCPL-354-000E features broader current transfer ratio specifications (20% to 400% at 1mA test conditions) and lower Vce saturation (200mV versus 300mV), indicating improved switching performance. Maximum output voltage is 35V (versus 40V), and output current is 50mA (versus 40mA). Operating temperature range matches the PS2765-1 (-55°C to 100°C). The part is ROHS3 compliant and REACH unaffected. Package is 4-Mini-Flat with Cut Tape (CT) & Digi-Reel® packaging.

LTV-354T (Lite-On Inc.): This part is functionally equivalent with identical isolation voltage and single-channel transistor output. The LTV-354T offers current transfer ratio specifications of 20% to 400% at 1mA test conditions and lower Vce saturation (200mV). Maximum output voltage is 35V and output current is 50mA. Operating temperature range extends to 110°C at the upper limit. The part is ROHS3 compliant and REACH unaffected. Packaging is Cut Tape (CT) & Digi-Reel® in 4-SOP configuration, matching the original PS2765-1 package type.

All three substitute parts are active products with current manufacturing status, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the FODM2705R2 directly replace the PS2765-1 in existing designs?

A: Yes. The FODM2705R2 maintains the critical substitution parameters: 3750Vrms isolation voltage, single-channel transistor output, AC/DC input capability, 4-SMD Gull Wing package, and MSL 1 moisture sensitivity. The part exceeds minimum performance requirements in output current (80mA versus 40mA) and switching speed. Pin configuration and package footprint are compatible. No circuit modifications are required.

Q: What is the difference between the HCPL-354-000E and LTV-354T?

A: Both parts meet the core substitution criteria for the PS2765-1. The primary differences are manufacturer (Broadcom versus Lite-On), package designation (4-Mini-Flat versus 4-SOP), and operating temperature upper limit (100°C versus 110°C). The LTV-354T package designation (4-SOP) matches the original PS2765-1 more closely. Both parts offer identical electrical performance with 3750Vrms isolation, 20-400% CTR range, and 200mV Vce saturation.

Q: Why does the HCPL-354-000E have a lower maximum output voltage (35V) compared to the PS2765-1 (40V)?

A: The HCPL-354-000E is rated for 35V maximum output voltage, which is within acceptable substitution parameters for most applications. If the design requires operation at voltages exceeding 35V, the FODM2705R2 or LTV-354T, both rated for 40V, are more appropriate selections.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three substitute parts (FODM2705R2, HCPL-354-000E, and LTV-354T) are ROHS3 compliant. The original PS2765-1 is RoHS non-compliant, making the substitutes advantageous for designs requiring regulatory compliance.

Q: What is the significance of the Current Transfer Ratio (CTR) test conditions?

A: CTR is measured at specific input current levels. The PS2765-1 specifies CTR at 5mA input, while HCPL-354-000E and LTV-354T specify CTR at 1mA input. The FODM2705R2 matches the PS2765-1 at 5mA. All parts meet or exceed the minimum 50% CTR requirement at their respective test conditions. This parameter determines the optical coupling efficiency and affects circuit design margins.

Q: Can the FODM2705R2 be used in applications requiring the full -55°C lower operating temperature?

A: The FODM2705R2 is rated for -40°C to 110°C, which does not extend to the -55°C lower limit of the PS2765-1. If the design requires operation below -40°C, the HCPL-354-000E or LTV-354T, both rated to -55°C (LTV-354T to -30°C), should be selected instead.

Q: What packaging formats are available for these substitute parts?

A: FODM2705R2 is supplied in Tape & Reel (TR) format. HCPL-354-000E and LTV-354T are supplied in Cut Tape (CT) & Digi-Reel® format. All parts are surface mount with 4-SMD Gull Wing package configuration, suitable for automated pick-and-place assembly.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message