PS2715-1-A Optoisolator Equivalent & Substitute Parts

Part Overview

The PS2715-1-A is a 3750Vrms isolation optoisolator with transistor output manufactured by CEL in a 4-SOP surface mount package. This component is designed for applications requiring galvanic isolation with AC/DC input capability and 40mA output current per channel. The part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value
Voltage - Isolation	3750Vrms
Number of Channels	1
Output Type	Transistor
Input Type	AC, DC
Voltage - Output (Max)	40V
Current - Output / Channel	40mA
Current Transfer Ratio (Min)	100% @ 1mA
Current Transfer Ratio (Max)	400% @ 1mA
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 PS2715-1-A is determined by the following critical parameters:

Primary Isolation Requirement: All substitute parts maintain 3750Vrms isolation voltage, the fundamental specification for galvanic isolation applications.

Output Configuration: All substitutes provide single-channel transistor output with AC/DC input capability, preserving the signal isolation and switching functionality.

Electrical Performance Boundaries: Substitute parts are grouped based on output current capability (40mA to 80mA), output voltage rating (35V to 40V), and Vce saturation characteristics (200mV to 300mV). These parameters define the load-switching envelope.

Current Transfer Ratio Specifications: The PS2715-1-A specifies 100-400% CTR @ 1mA. Substitute parts from onsemi (FODM series) specify 50-300% CTR @ 5mA, representing a different measurement condition but equivalent functional range for typical applications. Broadcom (HCPL-354-000E) and Lite-On (LTV-354T) specify 20-400% CTR @ 1mA, matching the measurement condition.

Package and Mounting: All substitutes use 4-SMD surface mount gull wing packages with identical PCB footprints, enabling direct board-level replacement.

Compliance and Environmental: All substitutes are ROHS3 compliant with MSL 1 rating, matching the original part's environmental specifications.

Parameter Comparison

Parameter	PS2715-1-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
Input Type	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC
Voltage - Output (Max)	40V	40V	40V	40V	35V	35V
Current - Output / Channel	40mA	80mA	80mA	80mA	50mA	50mA
Current Transfer Ratio (Min)	100% @ 1mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	20% @ 1mA	20% @ 1mA
Current Transfer Ratio (Max)	400% @ 1mA	300% @ 5mA	300% @ 5mA	300% @ 5mA	400% @ 1mA	400% @ 1mA
Rise / Fall Time (Typ)	4µs, 5µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	4µs, 3µs	4µs, 3µs
Vce Saturation (Max)	300mV	300mV	300mV	300mV	200mV	200mV
Voltage - Forward (Vf) (Typ)	1.15V	1.4V (Max)	1.4V (Max)	1.4V (Max)	1.2V	1.2V
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	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes - onsemi FODM Series (FODM2705, FODM2705R2, FODM2705R2V)

The onsemi FODM2705 family represents the most direct functional equivalent to the PS2715-1-A. All three variants maintain identical electrical specifications with enhanced output current capability (80mA versus 40mA), providing design margin for switching applications. The FODM2705R2 and FODM2705R2V are tape-and-reel packaged versions of the base FODM2705, with FODM2705R2V offering extended temperature range. These parts are active products with high inventory availability (44,300 to 110,200 units), ensuring long-term supply continuity. All are ROHS3 compliant and unaffected by REACH regulations.

Secondary Substitutes - Broadcom HCPL-354-000E and Lite-On LTV-354T

The Broadcom HCPL-354-000E and Lite-On LTV-354T provide functional equivalence with matching CTR specifications at 1mA measurement condition. Both deliver 50mA output current and feature improved Vce saturation (200mV versus 300mV), resulting in lower power dissipation in switching applications. The HCPL-354-000E operates across the original temperature range (-55°C to 100°C), while the LTV-354T extends to -30°C to 110°C. Both are active products with substantial inventory (12,520 and 90,300 units respectively) and full compliance certifications.

Packaging Considerations

The PS2715-1-A uses 4-SOP packaging. All substitute parts employ 4-SMD gull wing packages with identical PCB footprints, enabling direct board-level replacement without layout modification. The onsemi FODM2705 is available in tube packaging; FODM2705R2 and FODM2705R2V are supplied in tape-and-reel format. Broadcom and Lite-On parts are supplied in cut tape with Digi-Reel options.

Compliance and Regulatory

All substitute parts maintain ROHS3 compliance and MSL 1 moisture sensitivity rating. The onsemi FODM series is REACH unaffected, while Broadcom and Lite-On parts are REACH unaffected. All parts carry EAR99 ECCN classification and 8541.49.8000 HTSUS code, matching the original part's regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can FODM2705 series parts directly replace PS2715-1-A on existing PCBs?

A: Yes. The FODM2705, FODM2705R2, and FODM2705R2V use identical 4-SMD gull wing package geometry and pinout as the PS2715-1-A. No PCB layout modification is required. The enhanced 80mA output current capability provides additional design margin without affecting circuit operation.

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

A: All three variants share identical electrical specifications and package geometry. FODM2705 is supplied in tube packaging. FODM2705R2 is supplied in tape-and-reel format. FODM2705R2V is also tape-and-reel packaged with extended operating temperature range (-40°C to 110°C versus standard -40°C to 110°C). Selection depends on packaging requirements and temperature operating envelope.

Q: How do the onsemi FODM2705 parts differ from Broadcom HCPL-354-000E in terms of current transfer ratio?

A: The FODM2705 specifies 50-300% CTR measured at 5mA input current. The HCPL-354-000E specifies 20-400% CTR measured at 1mA input current. The different measurement conditions reflect manufacturer test methodology. Both parts provide equivalent functional performance in typical isolation applications where CTR variation is compensated by circuit design.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All five substitute parts (FODM2705, FODM2705R2, FODM2705R2V, HCPL-354-000E, and LTV-354T) are ROHS3 compliant with MSL 1 moisture sensitivity rating, matching the PS2715-1-A environmental specifications.

Q: What is the output voltage rating difference between onsemi and Broadcom/Lite-On substitutes?

A: The onsemi FODM2705 series maintains 40V maximum output voltage, identical to the PS2715-1-A. The Broadcom HCPL-354-000E and Lite-On LTV-354T are rated for 35V maximum output voltage. For applications operating below 35V, all substitutes are functionally equivalent. Applications requiring 35-40V output must use the onsemi FODM2705 series or PS2715-1-A.

Q: Which substitute offers the lowest power dissipation in switching applications?

A: The Broadcom HCPL-354-000E and Lite-On LTV-354T feature 200mV maximum Vce saturation, compared to 300mV for the PS2715-1-A and onsemi FODM2705 series. Lower saturation voltage reduces power dissipation in high-frequency switching applications. Selection depends on thermal budget and switching frequency requirements.

Q: What inventory availability should be considered for long-term supply?

A: The onsemi FODM2705R2 offers the highest inventory (110,200 units), followed by FODM2705R2V (45,200 units), LTV-354T (90,300 units), FODM2705 (44,300 units), and HCPL-354-000E (12,520 units). All parts are active products with established supply chains, ensuring availability for production requirements.

Q: Can LTV-354T be used in applications requiring -55°C minimum operating temperature?

A: No. The LTV-354T operates from -30°C to 110°C, which does not meet the -55°C minimum requirement of the PS2715-1-A. For applications requiring -55°C operation, use the PS2715-1-A (if available), HCPL-354-000E, or verify that the LTV-354T's -30°C minimum is acceptable for the specific application.

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