PS2705-1-F3 Optoisolator 3.75kV Transistor Output

Part Overview

The PS2705-1-F3 is a 3750Vrms isolation optoisolator with transistor output, housed in a 4-SOP surface mount package. This component is classified as Obsolete, necessitating the identification of active alternative components that maintain electrical and mechanical compatibility. The part is RoHS non-compliant and REACH-affected, making direct functional replacements with modern compliance certifications desirable for new designs and ongoing production support.

Key Parameters

Parameter	Value
Isolation Voltage	3750Vrms
Number of Channels	1
Output Type	Transistor
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	300% @ 5mA
Maximum Output Voltage	40V
Output Current per Channel	80mA
Vce Saturation (Max)	300mV
Input Type	AC, DC
Operating Temperature Range	-55°C ~ 100°C
Package Type	4-SMD, Gull Wing
Mounting	Surface Mount
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution compatibility is determined by the following critical parameters: isolation voltage (3750Vrms), single-channel transistor output configuration, surface mount package style (4-SMD, Gull Wing), and operating characteristics including current transfer ratio, output voltage, and output current specifications.

The PS2705-1-F3 substitutes are grouped into two categories:

Direct Upgrades (Electrical Equivalents with Enhanced Compliance): PS2705-1-F3-A (Renesas), FODM2705 (onsemi), FODM2705R2 (onsemi), and FODM2705R2V (onsemi) maintain full electrical equivalence and identical isolation voltage, output current, and saturation voltage specifications. These parts achieve RoHS3 compliance and REACH unaffected status, making them preferable for designs requiring modern regulatory compliance.

Similar Functional Alternatives (Extended Compatibility Range): HCPL-354-000E (Broadcom) and LTV-354T (Lite-On) share the 3750Vrms isolation voltage and transistor output configuration but operate within extended current transfer ratio ranges (20-400% @ 1mA) and reduced output current per channel (50mA). These parts feature lower Vce saturation (200mV) and are suitable for applications where the reduced output current specification meets circuit requirements.

Parameter Comparison

Parameter	PS2705-1-F3	PS2705-1-F3-A	FODM2705	FODM2705R2	FODM2705R2V	HCPL-354-000E	LTV-354T
Manufacturer	CEL	Renesas Electronics	onsemi	onsemi	onsemi	Broadcom Limited	Lite-On Inc.
Isolation Voltage	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Number of Channels	1	1	1	1	1	1	1
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	20% @ 1mA	20% @ 1mA
Current Transfer Ratio (Max)	300% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 5mA	400% @ 1mA	400% @ 1mA
Maximum Output Voltage	40V	40V	40V	40V	40V	35V	35V
Output Current per Channel	80mA	80mA	80mA	80mA	80mA	50mA	50mA
Input Type	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC
Vce Saturation (Max)	300mV	300mV	300mV	300mV	300mV	200mV	200mV
Operating Temperature Range	-55°C ~ 100°C	-55°C ~ 100°C	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	-55°C ~ 100°C	-30°C ~ 110°C
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
REACH Status	REACH Affected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Obsolete	Not For New Designs	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For New Designs or Compliance-Driven Applications: The onsemi FODM2705, FODM2705R2, and FODM2705R2V are recommended primary substitutes. These parts maintain full electrical equivalence to the PS2705-1-F3 while achieving RoHS3 compliance and REACH unaffected status. All three onsemi variants are in active product status, ensuring long-term supply chain availability and manufacturing support. Selection among the three onsemi options should be based on packaging format: FODM2705 in Tube packaging, FODM2705R2 and FODM2705R2V in Tape & Reel format.

For Legacy System Maintenance: The PS2705-1-F3-A (Renesas) provides an intermediate option with identical electrical specifications and RoHS3 compliance. This part maintains "Not For New Designs" status, suitable for ongoing support of existing products without full redesign requirements.

For Extended Temperature Range Applications: The LTV-354T (Lite-On) extends the operating temperature maximum to 110°C. However, this substitution requires circuit verification to confirm the 50mA output current per channel specification meets application requirements, as this represents a reduction from the PS2705-1-F3 rated 80mA. The HCPL-354-000E alternative similarly reduces output current specification and is not preferred without circuit analysis.

Frequently Asked Questions (FAQ)

Q: Can HCPL-354-000E directly replace PS2705-1-F3 without circuit modifications? A: HCPL-354-000E shares the 3750Vrms isolation voltage and transistor output type, but specifies reduced output current per channel (50mA vs. 80mA) and lower maximum output voltage (35V vs. 40V). Direct substitution requires verification that the application does not exceed 50mA output current demand and operates below 35V output levels.

Q: What is the difference between FODM2705, FODM2705R2, and FODM2705R2V? A: All three parts are electrically identical with 3750Vrms isolation, 80mA output current, and 300mV maximum saturation voltage. The differences are packaging format: FODM2705 is supplied in Tube, FODM2705R2 is supplied in Tape & Reel format, and FODM2705R2V is also supplied in Tape & Reel format with identical electrical specifications.

Q: Is the PS2705-1-F3-A suitable for new product development? A: PS2705-1-F3-A carries "Not For New Designs" status, indicating it is intended for legacy product support only. New designs should utilize active-status alternatives: FODM2705, FODM2705R2, FODM2705R2V, LTV-354T, or HCPL-354-000E.

Q: What factors must be verified when selecting a substitute for PS2705-1-F3? A: Critical verification parameters are: isolation voltage (all substitutes maintain 3750Vrms), output current per channel requirements (onsemi parts and PS2705-1-F3-A support 80mA; Broadcom and Lite-On alternatives support 50mA), maximum output voltage (onsemi and PS2705-1-F3-A support 40V; Broadcom and Lite-On support 35V), operating temperature range requirements, and package format compatibility (all use 4-SMD Gull Wing configuration).

Q: Do all substitute parts meet modern regulatory compliance? A: All substitute parts listed are RoHS3 compliant and REACH unaffected. The original PS2705-1-F3 is RoHS non-compliant and REACH affected, making compliance-driven applications dependent on substitute part selection.

Q: Can LTV-354T replace PS2705-1-F3 in applications requiring maximum -55°C operating temperature? A: LTV-354T specifies -30°C as the minimum operating temperature, limiting its use to applications operating above -30°C. Applications requiring -55°C operation must utilize PS2705-1-F3-A, FODM2705, FODM2705R2, FODM2705R2V, or HCPL-354-000E.

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