PS2701-1-M-A Optoisolator Equivalent & Substitute Parts

Part Overview

The PS2701-1-M-A is an optoisolator with transistor output manufactured by CEL, designed for high-voltage isolation applications. This single-channel device provides 3750Vrms isolation with DC input and transistor output configuration in a 4-SMD surface mount package. The part is currently active in production with full inventory availability. Equivalent and substitute parts are identified based on matching electrical specifications, isolation voltage, output characteristics, and package compatibility to support component procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Voltage - Isolation	3750Vrms
Number of Channels	1
Current Transfer Ratio (Min)	50% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	40V
Current - Output / Channel	80mA
Vce Saturation (Max)	300mV
Operating Temperature Range	-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 eligibility for the PS2701-1-M-A is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Isolation: 3750Vrms (exact match required)
Number of Channels: 1 (exact match required)
Output Type: Transistor (exact match required)
Input Type: DC (exact match required)
Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Parameters:

Current Transfer Ratio (Min): 50% @ 5mA or higher
Voltage - Output (Max): 40V or higher
Current - Output / Channel: 80mA or higher
Vce Saturation (Max): 300mV or lower
Operating Temperature Range: Must encompass or exceed -55°C ~ 100°C
RoHS3 Compliance: Required
Moisture Sensitivity Level: 1 (Unlimited)

Package Considerations:

Primary package compatibility: 4-SMD, Gull Wing
Alternative package: 4-SOP (functionally equivalent with board layout adjustment)

All identified substitute parts meet the primary matching criteria and maintain compatibility within the secondary parameter ranges.

Parameter Comparison

Parameter	PS2701-1-M-A (CEL)	FODM2701 (onsemi)	FODM2701R2 (onsemi)	LTV-357T (Lite-On)
Manufacturer	CEL	onsemi	onsemi	Lite-On Inc.
Voltage - Isolation	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Number of Channels	1	1	1	1
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	150% @ 5mA	300% @ 5mA	300% @ 5mA	600% @ 5mA
Rise / Fall Time (Typ)	3µs, 5µs	3µs, 3µs	3µs, 3µs	4µs, 3µs
Output Type	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	40V	40V	40V	35V
Current - Output / Channel	80mA	80mA	80mA	50mA
Voltage - Forward (Vf) (Typ)	1.1V	1.4V (Max)	1.4V (Max)	1.2V
Vce Saturation (Max)	300mV	300mV	300mV	200mV
Operating Temperature	-55°C ~ 100°C	-40°C ~ 110°C	-40°C ~ 110°C	-55°C ~ 110°C
Mounting Type	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
Packaging Type	Tube	Tube	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

FODM2701 (onsemi) - Tube Packaging: This substitute maintains identical isolation voltage, channel count, output type, and maximum output specifications. The FODM2701 provides higher maximum current transfer ratio (300% vs. 150%) and extended upper operating temperature (110°C vs. 100°C). Minimum operating temperature is -40°C, which is 15°C higher than the PS2701-1-M-A. All parts are ROHS3 compliant with MSL 1 rating. Tube packaging matches the original part format.

FODM2701R2 (onsemi) - Cut Tape & Digi-Reel Packaging: This part is electrically identical to FODM2701 with the same performance characteristics. The primary difference is packaging format (Cut Tape & Digi-Reel® instead of Tube). Selection of this variant depends on procurement and assembly line requirements. All compliance certifications match the main part.

LTV-357T (Lite-On Inc.) - Cut Tape & Digi-Reel Packaging: This substitute meets the core isolation and channel requirements with identical minimum current transfer ratio. The LTV-357T provides superior maximum current transfer ratio (600% vs. 150%) and lower Vce saturation (200mV vs. 300mV). Maximum output current is reduced to 50mA (vs. 80mA) and maximum output voltage is 35V (vs. 40V). Operating temperature range extends to -55°C lower bound, matching the original part. This part requires board layout adjustment due to 4-SOP package designation, though mechanical form factor remains 4-SMD, Gull Wing.

All substitute parts maintain active product status and full regulatory compliance (ROHS3, REACH Unaffected, EAR99 classification).

Frequently Asked Questions (FAQ)

Q: Can FODM2701 directly replace PS2701-1-M-A without circuit modification?

A: FODM2701 is electrically compatible for applications within the specified parameter ranges. The higher maximum current transfer ratio (300% vs. 150%) and extended operating temperature range provide additional design margin. Minimum operating temperature of -40°C must be verified against application requirements if operation below this temperature is needed. Tube packaging format is identical.

Q: What is the key difference between FODM2701 and FODM2701R2?

A: Both parts are electrically identical. The difference is packaging format: FODM2701 is supplied in Tube, while FODM2701R2 is supplied in Cut Tape (CT) & Digi-Reel®. Selection depends on procurement specifications and assembly equipment compatibility.

Q: Is LTV-357T suitable for applications requiring 80mA output current?

A: LTV-357T has a maximum output current rating of 50mA, compared to 80mA for PS2701-1-M-A. This part is not suitable for applications requiring the full 80mA output current specification. Verify actual application current requirements before selection.

Q: What is the impact of LTV-357T's 35V maximum output voltage versus 40V on PS2701-1-M-A?

A: LTV-357T maximum output voltage is 35V compared to 40V on the original part. Applications operating at voltages between 35V and 40V require verification that LTV-357T meets the design specification. For applications operating below 35V, this parameter is not a limiting factor.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. PS2701-1-M-A, FODM2701, FODM2701R2, and LTV-357T are all ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). All parts are REACH Unaffected and classified as EAR99 for export control purposes.

Q: What is the minimum operating temperature consideration for FODM2701 and FODM2701R2?

A: Both onsemi parts have a minimum operating temperature of -40°C, which is 15°C higher than the PS2701-1-M-A minimum of -55°C. Applications requiring operation below -40°C must use PS2701-1-M-A or LTV-357T (which supports -55°C minimum).

Q: Can LTV-357T be used in existing PCB layouts designed for PS2701-1-M-A?

A: LTV-357T uses 4-SOP supplier device package designation, while PS2701-1-M-A uses 4-SMD. Although both maintain 4-SMD, Gull Wing mechanical form factor, pin configuration and footprint must be verified for compatibility. Board layout adjustment may be required.

Q: What is the significance of higher current transfer ratio in substitute parts?

A: Higher maximum current transfer ratio (FODM2701/FODM2701R2 at 300%, LTV-357T at 600% vs. PS2701-1-M-A at 150%) indicates greater output current capability relative to input current. This provides design margin and improved performance in applications sensitive to current transfer efficiency. Minimum current transfer ratio (50% @ 5mA) is identical across all parts.

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