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

Part Overview

The PS2701-1-P-A is a single-channel optoisolator with 3750Vrms isolation voltage and transistor output, manufactured by CEL in 4-SMD surface mount package. This component is discontinued at DiGi Electronics, making identification of functionally equivalent substitute parts essential for design continuation and procurement planning. Alternative models from active manufacturers provide comparable isolation voltage, channel configuration, and output characteristics suitable for direct replacement in existing designs.

Substiute Parts

PS2701-1-P-A

CELIn Stock: 947PS2701-1-P-A Datasheet

Current PartRFQ

FODM2701

onsemiIn Stock: 20077FODM2701 Datasheet

SimilarRFQ

FODM2701R2

onsemiIn Stock: 1753FODM2701R2 Datasheet

SimilarRFQ

LTV-357T

Lite-On Inc.In Stock: 10147LTV-357T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PS2701-1-P-A is determined by the following critical parameters:

Primary Matching Criteria:

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

Secondary Compatibility Parameters:

• Voltage - Output (Max): ≥ 35V minimum (original provides 40V)
• Current - Output / Channel: ≥ 50mA minimum (original provides 80mA)
• Package / Case: 4-SMD Gull Wing or equivalent 4-pin SMD configuration
• Operating Temperature Range: Must accommodate or exceed original -55°C to 100°C minimum

All three identified substitute parts meet the primary matching criteria and provide comparable or superior performance characteristics within acceptable tolerance ranges for the specified application category.

Parameter Comparison

Engineering Selection Recommendations

FODM2701 and FODM2701R2 (onsemi): Both variants provide identical electrical specifications and meet all primary substitution criteria. FODM2701 is available in Tube packaging, while FODM2701R2 is supplied in Cut Tape (CT) & Digi-Reel format. The onsemi parts feature a lower minimum current transfer ratio (50% vs. 150%) but maintain the same maximum ratio and output voltage specifications. Both are ROHS3 compliant with active product status and unlimited moisture sensitivity rating.

LTV-357T (Lite-On Inc.): This substitute offers superior current transfer ratio performance (600% maximum) and reduced Vce saturation (200mV vs. 300mV). The operating temperature range extends to -55°C minimum, matching the original specification. However, the maximum output voltage is limited to 35V (vs. 40V) and output current per channel is 50mA (vs. 80mA). The LTV-357T uses 4-SOP packaging, which is mechanically equivalent to 4-SMD for surface mount applications. Selection of this part requires design review if applications demand the full 40V output voltage or 80mA current capability.

All three substitutes carry ROHS3 compliance and unlimited moisture sensitivity classification, ensuring regulatory alignment with the discontinued original component.

Frequently Asked Questions (FAQ)

Q: Can FODM2701 and FODM2701R2 be used interchangeably? A: Yes. Both parts share identical electrical and functional specifications. The difference is packaging format: FODM2701 is supplied in Tube, while FODM2701R2 is supplied in Cut Tape (CT) & Digi-Reel. Selection depends on procurement and assembly requirements.

Q: Is the LTV-357T a direct replacement for the PS2701-1-P-A? A: The LTV-357T shares the critical 3750Vrms isolation voltage, single-channel transistor output, and 4-pin SMD form factor. However, it has a 35V maximum output voltage and 50mA output current per channel, compared to the original's 40V and 80mA. Design validation is required if the application uses output voltages above 35V or demands output current exceeding 50mA.

Q: What is the difference between 4-SMD and 4-SOP packaging? A: Both are 4-pin surface mount packages with compatible pinout and footprint for this optoisolator category. The LTV-357T uses 4-SOP designation but functions as a direct mechanical substitute in PCB applications designed for 4-pin SMD optoisolators.

Q: Why does the PS2701-1-P-A show a higher minimum current transfer ratio than the onsemi substitutes? A: The PS2701-1-P-A specifies a minimum current transfer ratio of 150% at 5mA, while FODM2701 and FODM2701R2 specify 50% at the same condition. Both product lines meet the same maximum ratio (300%). The original part provides tighter minimum specifications; the onsemi substitutes are acceptable where design margins accommodate the wider tolerance band.

Q: Are all substitute parts RoHS3 compliant? A: Yes. The PS2701-1-P-A, FODM2701, FODM2701R2, and LTV-357T are all ROHS3 compliant with moisture sensitivity level 1 (unlimited), ensuring environmental and regulatory alignment.

Q: What is the primary reason to select one substitute over another? A: Select FODM2701 or FODM2701R2 for direct electrical equivalence and identical output specifications (40V, 80mA). Select LTV-357T only if the superior current transfer ratio (600%) and lower saturation voltage (200mV) provide design advantages, and if the reduced output voltage (35V) and current (50mA) limits are acceptable for the application.