PS2703-1 Equivalent & Substitute Parts Reference

Part Overview

The PS2703-1 is a single-channel optoisolator with transistor output manufactured by CEL, rated for 3750Vrms isolation voltage. This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing design support and procurement continuity. The PS2703-1 operates with a 4-SMD gull wing package and is designed for DC input applications requiring galvanic isolation in industrial and consumer electronics.

Substiute Parts

PS2703-1

CELIn Stock: 7215PS2703-1 Datasheet

Current PartRFQ

4N25SM

onsemiIn Stock: 30804N25SM Datasheet

SimilarRFQ

LTV-358T

Lite-On Inc.In Stock: 20148LTV-358T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PS2703-1 optoisolator are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Single-channel configuration
• Isolation voltage rating of 3750Vrms or higher
• Transistor output topology
• DC input type
• Surface mount gull wing package
• Operating temperature range encompassing -55°C to 100°C
• Current transfer ratio performance within acceptable operational range

Substitute Classification:

The LTV-358T from Lite-On Inc. qualifies as a direct substitute. It maintains identical isolation voltage (3750Vrms), matching package specification (4-SMD gull wing), and equivalent output stage configuration. The LTV-358T is active product status with RoHS3 compliance, addressing the obsolescence of the PS2703-1.

The 4N25SM from onsemi represents a functional alternative with higher isolation voltage (4170Vrms) and modified output configuration (transistor with base). This part operates within compatible electrical parameters but features a 6-SMD package and reduced maximum output voltage (30V versus 120V), requiring circuit-level evaluation.

Parameter Comparison

Engineering Selection Recommendations

LTV-358T (Recommended Primary Substitute)

The LTV-358T from Lite-On Inc. is the recommended substitute for PS2703-1 applications. This part maintains electrical and mechanical compatibility with identical isolation voltage, matching 4-SMD gull wing package, and equivalent output stage specifications. The LTV-358T is active product status, ensuring long-term availability and supply chain continuity. RoHS3 compliance addresses regulatory requirements for new designs. The LTV-358T demonstrates improved performance characteristics including faster rise/fall times (4µs/3µs versus 10µs/10µs) and lower Vce saturation (200mV versus 300mV), providing enhanced switching performance in isolation applications.

4N25SM (Functional Alternative)

The 4N25SM from onsemi functions as an alternative for applications where higher isolation voltage (4170Vrms) is beneficial. However, this part introduces design considerations: the 6-SMD package differs from the original 4-SMD footprint, requiring PCB layout modification. The reduced maximum output voltage (30V versus 120V) restricts applicability to lower voltage output circuits. The 4N25SM includes base output configuration, enabling additional circuit design flexibility. This part is suitable for new designs where package change is acceptable and output voltage requirements align with 30V maximum rating.

Compliance and Regulatory Status

Both substitute parts are RoHS3 compliant, addressing environmental and regulatory requirements for modern electronics manufacturing. The PS2703-1 RoHS non-compliant status necessitates substitution for applications subject to RoHS directives. Both substitutes maintain ECCN EAR99 classification and HTSUS 8541.49.8000 tariff code alignment with the original part.

Frequently Asked Questions (FAQ)

Q: Can the LTV-358T directly replace the PS2703-1 without PCB modification?

A: Yes. The LTV-358T maintains identical 4-SMD gull wing package configuration, pin count, and electrical specifications. Direct footprint compatibility enables drop-in replacement without PCB redesign.

Q: What are the key differences between LTV-358T and 4N25SM substitutes?

A: The LTV-358T provides direct package and electrical compatibility with identical 4-SMD footprint and 120V maximum output voltage. The 4N25SM features higher isolation voltage (4170Vrms) and transistor-with-base output configuration but requires 6-SMD package accommodation and operates at reduced maximum output voltage (30V). Selection depends on circuit voltage requirements and PCB layout constraints.

Q: Is the LTV-358T suitable for applications requiring RoHS compliance?

A: Yes. The LTV-358T is RoHS3 compliant, meeting environmental and regulatory requirements for electronics manufacturing in regulated markets. The PS2703-1 RoHS non-compliant status makes the LTV-358T the appropriate choice for compliant designs.

Q: How do the current transfer ratios compare between these parts?

A: The PS2703-1 specifies 50% minimum CTR at 5mA. The LTV-358T provides 80% minimum CTR at 5mA, indicating improved optical coupling efficiency. The 4N25SM specifies 20% minimum CTR at 10mA, representing lower coupling efficiency at different measurement conditions. Circuit designs should account for these CTR variations in gain calculations.

Q: What is the impact of faster rise/fall times in the LTV-358T?

A: The LTV-358T rise/fall times (4µs/3µs) are faster than the PS2703-1 (10µs/10µs), enabling higher switching frequency operation and improved transient response. Applications with timing-critical isolation requirements benefit from this performance improvement.

Q: Can the 4N25SM be used in existing PS2703-1 circuit designs?

A: The 4N25SM functions as a substitute only in applications where the 30V maximum output voltage meets circuit requirements. The 6-SMD package requires PCB layout modification. The transistor-with-base output configuration provides additional design flexibility but differs from standard transistor output topology. Circuit-level evaluation is necessary to confirm compatibility.

Q: What is the operating temperature range consideration for substitution?

A: The PS2703-1 operates -55°C to 100°C. The LTV-358T extends to -55°C to 110°C, providing wider temperature margin. The 4N25SM matches the original -55°C to 100°C range. Both substitutes accommodate the original operating temperature specification.

Q: Are there packaging format differences affecting procurement?

A: The PS2703-1 is supplied in standard packaging. The LTV-358T is available in Tape & Reel (TR) format, standard for high-volume surface mount assembly. The 4N25SM is supplied in Tube packaging. Procurement specifications should confirm packaging format compatibility with assembly processes.