PS2701-1 Optoisolator Equivalent & Substitute Parts

Part Overview

The PS2701-1 is a 3.75kV isolation optoisolator with transistor output manufactured by CEL in 4-SMD surface mount package. This component provides galvanic isolation for signal transmission in industrial and power management applications. The PS2701-1 is classified as obsolete product status, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Isolation	3750Vrms
Number of Channels	1
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	300% @ 5mA
Output Type	Transistor
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

Substitute Part Grouping Explanation

Substitute parts for the PS2701-1 are classified into three categories based on electrical and mechanical compatibility:

Upgrade Substitutes (Direct Replacements): FODM2701 and FODM2701R2 from onsemi maintain identical electrical specifications including 3750Vrms isolation, 50-300% current transfer ratio, 40V maximum output voltage, and 80mA output current. These parts share the same 4-SMD package configuration and are active products with RoHS3 compliance, addressing the obsolescence of the original PS2701-1.

Similar Substitutes (Parameter Variations): LTV-356T, LTV-357T, PC357NJ0000F, and SFH690ABT maintain the 3750Vrms isolation voltage and transistor output configuration but introduce variations in secondary parameters. These parts feature higher current transfer ratios (up to 600%), different maximum output voltages (35V to 80V), and reduced output current ratings (50mA). Package variants include 4-SOP and 4-Mini-Flat configurations.

Parametric Equivalent: PS2701-1-K-A from Renesas Electronics Corporation provides identical electrical performance to the original PS2701-1 within the NEPOC series, with active product status and RoHS3 compliance.

Substitution eligibility is determined by: isolation voltage (3750Vrms required), output type (transistor), input type (DC), and mounting type (surface mount). Secondary parameters including current transfer ratio range, output voltage rating, and output current capacity must be evaluated against specific application requirements.

Parameter Comparison

Parameter	PS2701-1 (Main)	FODM2701	FODM2701R2	LTV-356T	LTV-357T	PC357NJ0000F	SFH690ABT	PS2701-1-K-A
Manufacturer	CEL	onsemi	onsemi	Lite-On Inc.	Lite-On Inc.	SHARP/Socle Technology	Vishay Semiconductor Opto Division	Renesas Electronics Corporation
Voltage - Isolation	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Number of Channels	1	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	300% @ 5mA	300% @ 5mA	300% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	300% @ 5mA	300% @ 5mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	40V	40V	40V	80V	35V	80V	70V	40V
Current - Output / Channel	80mA	80mA	80mA	50mA	50mA	50mA	50mA	80mA
Vce Saturation (Max)	300mV	300mV	300mV	200mV	200mV	200mV	300mV	300mV
Operating Temperature	-55°C ~ 100°C	-40°C ~ 110°C	-40°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-30°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	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	4-SMD, Gull Wing	4-SMD, Gull Wing
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement: FODM2701 and FODM2701R2 are recommended as primary substitutes. Both parts maintain identical electrical specifications to the PS2701-1 including 40V maximum output voltage and 80mA output current. FODM2701 is available in tube packaging with 20,046 units in stock. FODM2701R2 is available in cut tape and digi-reel packaging with 1,718 units in stock. Both are active products with RoHS3 compliance and REACH unaffected status, addressing regulatory requirements and supply chain continuity.

For Applications with Extended Temperature Range: PS2701-1-K-A from Renesas Electronics Corporation provides parametric equivalence with identical electrical performance and maintains the original -55°C to 100°C operating temperature range. This part is active with RoHS3 compliance and 866 units in stock.

For Applications Requiring Higher Output Voltage Capability: LTV-356T and PC357NJ0000F support 80V maximum output voltage compared to 40V for the PS2701-1. These parts maintain 3750Vrms isolation and transistor output configuration. LTV-356T has 5,856 units in stock; PC357NJ0000F has 46,701 units in stock. Both are active products with RoHS3 compliance.

For Applications with Reduced Output Current Requirements: LTV-356T, LTV-357T, PC357NJ0000F, and SFH690ABT all provide 50mA output current rating. These parts are suitable for applications where the 80mA capability of the PS2701-1 is not required. All are active products with RoHS3 compliance.

Compliance Considerations: All substitute parts except the original PS2701-1 are RoHS3 compliant. FODM2701, FODM2701R2, LTV-356T, LTV-357T, PC357NJ0000F, and SFH690ABT are REACH unaffected. PS2701-1-K-A is REACH affected, matching the original part's regulatory status.

Frequently Asked Questions (FAQ)

Q: Can FODM2701 directly replace PS2701-1 in existing designs?

A: Yes. FODM2701 maintains identical electrical specifications including 3750Vrms isolation voltage, 50-300% current transfer ratio, 40V maximum output voltage, 80mA output current, and 300mV maximum Vce saturation. Both use 4-SMD gull wing surface mount packages. The primary difference is product status (active vs. obsolete) and regulatory compliance (RoHS3 vs. non-compliant).

Q: What are the key differences between FODM2701 and LTV-356T?

A: FODM2701 provides 80mA output current and 40V maximum output voltage. LTV-356T provides 50mA output current and 80V maximum output voltage. Both maintain 3750Vrms isolation and 50% minimum current transfer ratio. LTV-356T uses a 4-SOP package variant while FODM2701 uses 4-SMD. Selection depends on output current and voltage requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are RoHS3 compliant. The original PS2701-1 is RoHS non-compliant. For applications requiring RoHS compliance, any of the substitute parts are suitable. PS2701-1-K-A maintains REACH affected status matching the original part; all other substitutes are REACH unaffected.

Q: What is the difference between FODM2701 and FODM2701R2?

A: FODM2701 and FODM2701R2 are electrically identical. The difference is packaging: FODM2701 is supplied in tube packaging; FODM2701R2 is supplied in cut tape and digi-reel packaging. Selection depends on procurement and assembly requirements.

Q: Can I use LTV-357T instead of LTV-356T?

A: LTV-357T and LTV-356T are electrically identical except for maximum output voltage: LTV-357T is rated 35V maximum while LTV-356T is rated 80V maximum. Both provide 50mA output current and 3750Vrms isolation. LTV-357T is suitable for applications with lower output voltage requirements.

Q: What is the impact of different rise and fall times on substitution?

A: Rise and fall times affect switching speed. PS2701-1 specifies 3µs rise and 5µs fall time. FODM2701 specifies 3µs rise and 3µs fall time. LTV-356T, LTV-357T, PC357NJ0000F, and SFH690ABT specify 4µs rise and 3µs fall time. These variations are within typical optoisolator performance ranges and do not prevent substitution in standard applications.

Q: Is PS2701-1-K-A a suitable replacement for PS2701-1?

A: Yes. PS2701-1-K-A provides parametric equivalence with identical electrical specifications and operating temperature range (-55°C to 100°C). It is an active product with RoHS3 compliance. The primary advantage is active product status and regulatory compliance; the primary consideration is REACH affected status matching the original part.

Q: What inventory levels are available for each substitute?

A: FODM2701 has 20,046 units in stock. FODM2701R2 has 1,718 units. LTV-356T has 5,856 units. LTV-357T has 10,099 units. PC357NJ0000F has 46,701 units. SFH690ABT has 9,270 units. PS2701-1-K-A has 866 units. PC357NJ0000F offers the highest inventory availability.

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