PS2705-1-A Optoisolator Equivalent & Substitute Parts

Part Overview

The PS2705-1-A is a 3750Vrms optoisolator with transistor output manufactured by CEL in a 4-SOP surface mount package. This component provides galvanic isolation for single-channel applications requiring AC or DC input capability. The part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. Substitute parts must maintain electrical isolation voltage, output current capacity, and package compatibility for direct circuit replacement.

Substiute Parts

PS2705-1-A

CELIn Stock: 1531PS2705-1-A Datasheet

Current PartRFQ

FODM2705

onsemiIn Stock: 44398FODM2705 Datasheet

UpgradeRFQ

FODM2705R2

onsemiIn Stock: 110269FODM2705R2 Datasheet

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FODM2705R2V

onsemiIn Stock: 45306FODM2705R2V Datasheet

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HCPL-354-000E

Broadcom LimitedIn Stock: 12556HCPL-354-000E Datasheet

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LTV-354T

Lite-On Inc.In Stock: 90406LTV-354T Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical and mechanical parameter alignment:

Upgrade Substitutes (Direct Replacement): FODM2705, FODM2705R2, and FODM2705R2V manufactured by onsemi maintain identical isolation voltage (3750Vrms), channel count (1), output type (transistor), current transfer ratio range (50-300% @ 5mA), maximum output voltage (40V), and maximum output current (80mA). These parts differ only in packaging format (Tube vs. Tape & Reel) and are functionally interchangeable. Operating temperature range extends to -40°C ~ 110°C, providing broader environmental coverage.

Similar Substitutes (Parameter Variance): HCPL-354-000E (Broadcom) and LTV-354T (Lite-On) share the 3750Vrms isolation voltage and single-channel transistor output configuration. However, these parts exhibit different current transfer ratio specifications (20-400% @ 1mA vs. 50-300% @ 5mA), reduced maximum output voltage (35V vs. 40V), and lower maximum output current (50mA vs. 80mA). Package variants differ: HCPL-354-000E uses 4-Mini-Flat while LTV-354T uses 4-SOP. These parts require circuit validation before substitution.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: Select FODM2705, FODM2705R2, or FODM2705R2V from onsemi. These parts maintain all critical electrical parameters identical to PS2705-1-A: 3750Vrms isolation, 50-300% current transfer ratio at 5mA, 40V maximum output voltage, and 80mA maximum output current. All three variants are in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. Selection between variants depends on packaging requirements: FODM2705 in Tube packaging, FODM2705R2 and FODM2705R2V in Tape & Reel format. Extended operating temperature range (-40°C ~ 110°C) provides improved thermal margin compared to the original part.

For Constrained Applications: HCPL-354-000E (Broadcom) and LTV-354T (Lite-On) are suitable only when circuit design accommodates reduced output current (50mA vs. 80mA) and lower maximum output voltage (35V vs. 40V). Both maintain 3750Vrms isolation and single-channel transistor output. HCPL-354-000E uses 4-Mini-Flat packaging requiring PCB layout modification. LTV-354T maintains 4-SOP packaging compatible with PS2705-1-A footprints. Both parts are in active production with ROHS3 compliance.

Compliance Verification: All substitute parts maintain ROHS3 compliance, EAR99 export classification, and HTSUS code 8541.49.8000 alignment with the original part. REACH status differs: onsemi parts are REACH Unaffected while Broadcom and Lite-On parts are REACH Unaffected, requiring no additional regulatory action for substitution.

Frequently Asked Questions (FAQ)

Q: Can FODM2705 directly replace PS2705-1-A without circuit modification?

A: Yes. FODM2705 maintains identical electrical specifications for isolation voltage, current transfer ratio, output voltage, and output current. Both use 4-SMD Gull Wing surface mount packages. No circuit redesign is required for direct substitution.

Q: What is the difference between FODM2705, FODM2705R2, and FODM2705R2V?

A: These three onsemi parts are electrically identical. The differences are packaging formats: FODM2705 is supplied in Tube packaging, while FODM2705R2 and FODM2705R2V are supplied in Tape & Reel format. Selection depends on assembly line requirements and quantity needs.

Q: Why do HCPL-354-000E and LTV-354T have lower output current ratings?

A: HCPL-354-000E and LTV-354T are designed for different application requirements with maximum output current of 50mA versus 80mA for PS2705-1-A. These parts are suitable only for circuits designed to operate within their reduced current specifications.

Q: Is the 4-Mini-Flat package of HCPL-354-000E compatible with PS2705-1-A PCB layouts?

A: No. HCPL-354-000E uses 4-Mini-Flat packaging while PS2705-1-A uses 4-SOP. PCB footprint modification is required. LTV-354T maintains 4-SOP packaging and is footprint-compatible.

Q: What is the operating temperature difference between PS2705-1-A and onsemi substitutes?

A: PS2705-1-A operates from -55°C to 100°C. onsemi FODM2705 variants operate from -40°C to 110°C, providing extended upper temperature capability but reduced lower temperature range. Application requirements determine suitability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. PS2705-1-A and all listed substitute parts (FODM2705, FODM2705R2, FODM2705R2V, HCPL-354-000E, LTV-354T) are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Q: What is the current transfer ratio difference between PS2705-1-A and HCPL-354-000E?

A: PS2705-1-A specifies 50-300% CTR at 5mA input current. HCPL-354-000E specifies 20-400% CTR at 1mA input current. These are measured at different test conditions and cannot be directly compared. Circuit validation is required before substitution.