PS2701-1-A Optoisolator Equivalent & Substitute Parts

Part Overview

The PS2701-1-A is a 3.75kV isolation optoisolator with transistor output manufactured by CEL in a 4-SMD surface mount package. This component provides galvanic isolation for single-channel DC input applications with 80mA output current capability. The PS2701-1-A is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines. Substitute parts must maintain electrical compatibility across isolation voltage, current transfer ratio, output voltage/current ratings, and thermal operating range while accommodating packaging variations.

Substiute Parts

PS2701-1-A

CELIn Stock: 1310PS2701-1-A Datasheet

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FODM2701

onsemiIn Stock: 20077FODM2701 Datasheet

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FODM2701R2

onsemiIn Stock: 1753FODM2701R2 Datasheet

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LTV-357T

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

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PS2701-1-A is determined by strict equivalence across the following parameters:

Critical Electrical Parameters (Must Match Exactly):

• Voltage - Isolation: 3750Vrms (no deviation permitted)
• Number of Channels: 1 (single channel only)
• Output Type: Transistor (not photodiode or other types)
• Input Type: DC

Critical Performance Parameters (Must Meet or Exceed):

• Current Transfer Ratio (Min): ≥50% @ 5mA
• Current Transfer Ratio (Max): ≤300% @ 5mA (upper bound accommodation)
• Voltage - Output (Max): ≥40V
• Current - Output / Channel: ≥80mA

Important Compatibility Parameters (Flexible Within Limits):

• Operating Temperature: Must encompass application requirements
• Vce Saturation (Max): ≤300mV preferred for output performance
• Mounting Type: Surface Mount (required for PCB compatibility)
• Package / Case: 4-SMD Gull Wing (primary); 4-SOP acceptable with layout verification

Regulatory & Compliance Parameters:

• RoHS Status: ROHS3 Compliant (required)
• ECCN: EAR99 (maintained across all substitutes)

The substitute parts FODM2701, FODM2701R2, and LTV-357T satisfy all critical electrical parameters. FODM2701 and FODM2701R2 are direct electrical equivalents with identical package specifications. LTV-357T is classified as a similar part due to package variation (4-SOP vs. 4-SMD) and minor performance differences in output current and saturation voltage.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

FODM2701 and FODM2701R2 manufactured by onsemi are direct electrical and mechanical equivalents to the PS2701-1-A. Both parts maintain identical isolation voltage (3750Vrms), channel count (1), current transfer ratio range (50-300% @ 5mA), output voltage (40V max), and output current (80mA). Package specifications are identical (4-SMD, Gull Wing). Both parts are in active production status with substantial inventory availability (20046 Pcs and 1718 Pcs respectively). The distinction between FODM2701 and FODM2701R2 is packaging format: FODM2701 is supplied in Tube packaging, while FODM2701R2 is supplied in Cut Tape (CT) & Digi-Reel® format. Selection between these two depends on procurement and assembly requirements.

Operating temperature range for onsemi parts (-40°C to 110°C) is narrower at the lower bound compared to PS2701-1-A (-55°C to 100°C). Applications requiring operation below -40°C must retain the original PS2701-1-A or evaluate LTV-357T. REACH compliance status improves with onsemi substitutes (REACH Unaffected vs. REACH Affected for original part).

Secondary Substitute (Similar Part):

LTV-357T manufactured by Lite-On Inc. is classified as a similar part due to package variation and performance differences. This part maintains critical electrical parameters: 3750Vrms isolation, single channel, 50% minimum current transfer ratio, and transistor output. However, LTV-357T exhibits the following deviations:

• Current Transfer Ratio (Max): 600% @ 5mA (exceeds 300% specification)
• Voltage - Output (Max): 35V (below 40V specification)
• Current - Output / Channel: 50mA (below 80mA specification)
• Supplier Device Package: 4-SOP (differs from 4-SMD)

LTV-357T is suitable for applications where output current requirements do not exceed 50mA and output voltage does not exceed 35V. The 4-SOP package requires PCB layout verification for pin compatibility. LTV-357T offers superior operating temperature range (-55°C to 110°C) and lower Vce saturation (200mV vs. 300mV), providing advantages in low-temperature and switching performance applications.

Regulatory Compliance:

All substitute parts maintain ROHS3 compliance and EAR99 ECCN classification. REACH status improves with onsemi substitutes. Moisture sensitivity level remains at MSL 1 (Unlimited) across all options.

Frequently Asked Questions (FAQ)

Q1: Can FODM2701 or FODM2701R2 be used as direct replacements for PS2701-1-A without circuit modification?

A: Yes. FODM2701 and FODM2701R2 are direct electrical and mechanical equivalents. Both maintain identical isolation voltage (3750Vrms), output voltage (40V max), output current (80mA), current transfer ratio range (50-300% @ 5mA), and package specifications (4-SMD, Gull Wing). No circuit modification is required. The only consideration is operating temperature range: onsemi parts operate from -40°C to 110°C versus PS2701-1-A range of -55°C to 100°C. Applications requiring operation below -40°C require alternative evaluation.

Q2: What is the difference between FODM2701 and FODM2701R2?

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

Q3: Is LTV-357T a suitable replacement for PS2701-1-A?

A: LTV-357T is a similar part with critical electrical compatibility (3750Vrms isolation, single channel, transistor output) but exhibits performance deviations. Output current is limited to 50mA (versus 80mA for PS2701-1-A) and maximum output voltage is 35V (versus 40V). LTV-357T is suitable only for applications where output current does not exceed 50mA and output voltage does not exceed 35V. Additionally, LTV-357T uses 4-SOP package format instead of 4-SMD, requiring PCB layout verification for pin compatibility.

Q4: What are the key parameters that determine substitution eligibility?

A: Substitution eligibility is determined by: (1) Isolation voltage: must be 3750Vrms; (2) Channel count: must be 1; (3) Output type: must be transistor; (4) Current transfer ratio: must accommodate 50-300% @ 5mA range; (5) Output voltage: must be ≥40V (except LTV-357T at 35V); (6) Output current: must be ≥80mA (except LTV-357T at 50mA); (7) Package: 4-SMD Gull Wing preferred, 4-SOP acceptable with verification; (8) RoHS compliance: ROHS3 required.

Q5: How does operating temperature range affect part selection?

A: PS2701-1-A operates from -55°C to 100°C. FODM2701 and FODM2701R2 operate from -40°C to 110°C (narrower at lower bound, wider at upper bound). LTV-357T operates from -55°C to 110°C (matching lower bound, exceeding upper bound). Applications requiring operation below -40°C must use PS2701-1-A or LTV-357T. Applications requiring operation above 100°C must use onsemi or Lite-On substitutes.

Q6: Are there any compliance or regulatory differences between substitute parts?

A: All parts maintain ROHS3 compliance and EAR99 ECCN classification. REACH status differs: PS2701-1-A is REACH Affected, while FODM2701, FODM2701R2, and LTV-357T are REACH Unaffected. For applications subject to REACH regulations, onsemi and Lite-On substitutes provide improved compliance status. Moisture sensitivity level remains MSL 1 (Unlimited) across all options.

Q7: What inventory considerations should guide part selection?

A: PS2701-1-A is discontinued with 1234 Pcs remaining in stock. FODM2701 has the highest inventory (20046 Pcs), followed by LTV-357T (10099 Pcs) and FODM2701R2 (1718 Pcs). For long-term supply security, FODM2701 is the preferred choice. FODM2701R2 offers adequate inventory for near-term requirements with Cut Tape packaging. LTV-357T provides substantial inventory but requires performance verification for output current and voltage requirements.

Q8: Can PS2701-1-A be used interchangeably with LTV-357T in existing designs?

A: No. While both parts share 3750Vrms isolation and single-channel transistor output, LTV-357T has reduced output current (50mA vs. 80mA) and output voltage (35V vs. 40V). Designs utilizing the full 80mA output current or 40V output voltage capability will not function with LTV-357T. Additionally, the 4-SOP package differs from 4-SMD, requiring PCB layout changes. LTV-357T is suitable only for new designs with reduced output current and voltage requirements.