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PS2705-1-F3-A Equivalent & Substitute Parts
Part Overview
The PS2705-1-F3-A is a 3750Vrms optoisolator with transistor output manufactured by CEL (Renesas Electronics Corporation). This component provides galvanic isolation for single-channel applications requiring high voltage isolation in 4-SOP surface mount packaging. The part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Isolation | 3750Vrms |
| Number of Channels | 1 |
| Output Type | Transistor |
| Current Transfer Ratio (Min) | 50% @ 5mA |
| Current Transfer Ratio (Max) | 300% @ 5mA |
| Voltage - Output (Max) | 40V |
| Current - Output / Channel | 80mA |
| Vce Saturation (Max) | 300mV |
| Operating Temperature | -55°C ~ 100°C |
| Mounting Type | Surface Mount |
| Package / Case | 4-SMD, Gull Wing |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the PS2705-1-F3-A is determined by the following critical parameters:
Isolation Voltage: All substitute parts maintain 3750Vrms isolation, meeting the primary functional requirement.
Channel Configuration: Single-channel operation is preserved across all alternatives.
Output Type: Transistor output topology is consistent across all substitutes.
Current Transfer Ratio: The PS2705-1-F3-A specifies 50-300% @ 5mA. Substitute parts from onsemi (FODM2705 series) match this specification exactly. Parts from Broadcom (HCPL-354-000E) and Lite-On (LTV-354T) specify 20-400% @ 1mA, representing a different measurement condition but broader transfer ratio range.
Output Voltage and Current: Maximum output voltage of 40V and 80mA per channel are maintained by onsemi substitutes. Broadcom and Lite-On alternatives specify 35V maximum and 50mA per channel, representing reduced output capability.
Vce Saturation: onsemi parts maintain 300mV maximum saturation voltage. Broadcom and Lite-On alternatives specify 200mV, indicating improved saturation characteristics.
Operating Temperature: The PS2705-1-F3-A operates -55°C to 100°C. onsemi substitutes extend to -40°C to 110°C. Broadcom maintains -55°C to 100°C. Lite-On extends to -30°C to 110°C.
Packaging: Surface mount 4-SMD Gull Wing package is standard across all parts. Packaging format variations (Tube, Tape & Reel, Cut Tape) do not affect electrical compatibility.
Parameter Comparison
| Parameter | PS2705-1-F3-A (CEL) | FODM2705 (onsemi) | FODM2705R2 (onsemi) | FODM2705R2V (onsemi) | HCPL-354-000E (Broadcom) | LTV-354T (Lite-On) |
|---|---|---|---|---|---|---|
| Voltage - Isolation | 3750Vrms | 3750Vrms | 3750Vrms | 3750Vrms | 3750Vrms | 3750Vrms |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 1 |
| Output Type | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor |
| Current Transfer Ratio (Min) | 50% @ 5mA | 50% @ 5mA | 50% @ 5mA | 50% @ 5mA | 20% @ 1mA | 20% @ 1mA |
| Current Transfer Ratio (Max) | 300% @ 5mA | 300% @ 5mA | 300% @ 5mA | 300% @ 5mA | 400% @ 1mA | 400% @ 1mA |
| Voltage - Output (Max) | 40V | 40V | 40V | 40V | 35V | 35V |
| Current - Output / Channel | 80mA | 80mA | 80mA | 80mA | 50mA | 50mA |
| Voltage - Forward (Vf) (Typ) | 1.1V | 1.4V (Max) | 1.4V (Max) | 1.4V (Max) | 1.2V | 1.2V |
| Vce Saturation (Max) | 300mV | 300mV | 300mV | 300mV | 200mV | 200mV |
| Rise / Fall Time (Typ) | 3µs, 5µs | 3µs, 3µs | 3µs, 3µs | 3µs, 3µs | 4µs, 3µs | 4µs, 3µs |
| Operating Temperature | -55°C ~ 100°C | -40°C ~ 110°C | -40°C ~ 110°C | -40°C ~ 110°C | -55°C ~ 100°C | -30°C ~ 110°C |
| Mounting Type | Surface Mount | Surface Mount | 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 | 4-SMD, Gull Wing | 4-SMD, Gull Wing |
| RoHS Status | ROHS3 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) |
| Product Status | Discontinued at DiGi Electronics | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Primary Upgrade Path: The onsemi FODM2705 series (FODM2705, FODM2705R2, FODM2705R2V) provides direct electrical equivalence to the PS2705-1-F3-A. These parts maintain identical current transfer ratio specifications (50-300% @ 5mA), output voltage (40V maximum), output current (80mA per channel), and Vce saturation (300mV maximum). All three onsemi variants are in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. Selection among FODM2705, FODM2705R2, and FODM2705R2V depends on packaging requirements: Tube, Tape & Reel, or Tape & Reel with extended temperature rating, respectively.
Alternative Substitutes: The Broadcom HCPL-354-000E and Lite-On LTV-354T maintain 3750Vrms isolation and single-channel transistor output but with reduced output specifications. Maximum output voltage is 35V (versus 40V) and maximum output current is 50mA per channel (versus 80mA). These parts feature improved Vce saturation (200mV maximum versus 300mV) and broader current transfer ratio range (20-400% @ 1mA). Both alternatives are in active production with ROHS3 compliance. These substitutes are suitable for applications where reduced output voltage and current requirements are acceptable.
Product Status Consideration: The PS2705-1-F3-A is discontinued at DiGi Electronics. All identified substitutes maintain active production status, ensuring long-term availability and supply chain continuity.
Compliance: All substitute parts maintain ROHS3 compliance, REACH unaffected status, and unlimited moisture sensitivity level (MSL 1), matching the original part's environmental and regulatory certifications.
Frequently Asked Questions (FAQ)
Q: Can FODM2705 series parts directly replace PS2705-1-F3-A in existing designs?
A: Yes. The FODM2705, FODM2705R2, and FODM2705R2V maintain identical electrical specifications for isolation voltage (3750Vrms), current transfer ratio (50-300% @ 5mA), output voltage (40V maximum), output current (80mA per channel), and Vce saturation (300mV maximum). All three variants use the same 4-SMD Gull Wing package. Selection depends on packaging format: Tube (FODM2705), Tape & Reel (FODM2705R2), or Tape & Reel with extended temperature (FODM2705R2V).
Q: What are the key differences between onsemi and Broadcom/Lite-On substitutes?
A: onsemi FODM2705 series maintains full electrical equivalence to PS2705-1-F3-A, including 40V maximum output voltage and 80mA per channel output current. Broadcom HCPL-354-000E and Lite-On LTV-354T reduce maximum output voltage to 35V and output current to 50mA per channel. However, Broadcom and Lite-On alternatives offer improved Vce saturation (200mV versus 300mV) and broader current transfer ratio range (20-400% @ 1mA versus 50-300% @ 5mA). These alternatives are suitable only if application requirements permit reduced output specifications.
Q: Are there temperature range differences between substitutes?
A: Yes. PS2705-1-F3-A operates -55°C to 100°C. onsemi FODM2705 series operates -40°C to 110°C, extending the upper temperature limit but narrowing the lower limit by 15°C. Broadcom HCPL-354-000E maintains -55°C to 100°C matching the original. Lite-On LTV-354T operates -30°C to 110°C, narrowing the lower limit by 25°C but extending the upper limit. For applications requiring -55°C operation, use PS2705-1-F3-A or HCPL-354-000E. For applications requiring operation above 100°C, use onsemi or Lite-On alternatives.
Q: What packaging options are available for onsemi substitutes?
A: Three packaging formats are available: FODM2705 (Tube), FODM2705R2 (Tape & Reel), and FODM2705R2V (Tape & Reel with extended temperature). All three use identical 4-SMD Gull Wing surface mount package. Selection depends on procurement and assembly requirements. Tube packaging is suitable for small quantities. Tape & Reel formats support automated assembly processes.
Q: Can I use HCPL-354-000E or LTV-354T if my application requires 40V output and 80mA per channel?
A: No. HCPL-354-000E and LTV-354T specify maximum output voltage of 35V and maximum output current of 50mA per channel. These specifications are insufficient for applications requiring 40V output or 80mA per channel. Use onsemi FODM2705 series for full electrical equivalence.
Q: Are all substitutes ROHS3 compliant?
A: Yes. PS2705-1-F3-A and all identified substitutes (FODM2705, FODM2705R2, FODM2705R2V, HCPL-354-000E, LTV-354T) are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) and REACH unaffected status.
Q: What is the difference between FODM2705R2 and FODM2705R2V?
A: Both parts are identical electrically and mechanically. FODM2705R2V includes extended temperature rating capability. Both are supplied in Tape & Reel packaging. Consult onsemi documentation for specific temperature grade designations if extended temperature operation is required.
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