LTV-845S-TA Equivalent & Substitute Parts

Part Overview

The LTV-845S-TA is a 4-channel optoisolator with Darlington output manufactured by Lite-On Inc. It provides 5000Vrms isolation voltage and is designed for DC input applications requiring high current transfer ratios. The device is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications. Substitute parts must maintain electrical and mechanical compatibility across isolation voltage, channel configuration, output characteristics, and package specifications.

Substiute Parts

LTV-845S-TA

Lite-On Inc.In Stock: 1144LTV-845S-TA Datasheet

Current PartRFQ

ISP845SMT&R

Isocom Components 2004 LTDIn Stock: 1164ISP845SMT&R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LTV-845S-TA is determined by strict equivalence across the following critical parameters:

• Channel Configuration: 4 channels required
• Isolation Voltage: Minimum 5000Vrms
• Output Type: Darlington configuration
• Current Transfer Ratio: 600% minimum @ 1mA
• Maximum Output Voltage: 35V
• Output Current per Channel: 80mA
• Package: 16-SMD, Gull Wing surface mount
• Operating Temperature Range: -30°C ~ 100°C

The ISP845SMT&R meets all substitution criteria with equivalent or superior electrical characteristics and maintains identical mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The ISP845SMT&R is a direct substitute for the LTV-845S-TA based on the following factors:

• Electrical Equivalence: All critical electrical parameters match or exceed the original specification. Isolation voltage is superior at 5300Vrms versus 5000Vrms.
• Mechanical Compatibility: Identical 16-SMD Gull Wing package ensures PCB layout compatibility without redesign.
• Product Status: The ISP845SMT&R is active and in production, eliminating obsolescence risk associated with the LTV-845S-TA.
• Regulatory Compliance: The ISP845SMT&R carries ROHS3 and REACH compliance certifications, meeting current environmental standards.
• Availability: Both parts maintain adequate inventory levels for procurement.

Frequently Asked Questions (FAQ)

Q: Can the ISP845SMT&R replace the LTV-845S-TA in existing designs without PCB modification?

A: Yes. Both devices use identical 16-SMD Gull Wing packages with equivalent pinout and electrical characteristics. No PCB layout changes are required.

Q: What is the significance of the higher isolation voltage (5300Vrms) in the ISP845SMT&R?

A: The higher isolation voltage provides additional safety margin and is fully backward compatible. It does not affect circuit operation and enhances reliability in high-voltage isolation applications.

Q: Are there any compliance differences between the two parts?

A: The ISP845SMT&R includes ROHS3 and REACH compliance certifications. The LTV-845S-TA compliance status is not specified. For applications requiring regulatory compliance documentation, the ISP845SMT&R is the appropriate choice.

Q: Do the parts have identical current transfer ratios?

A: Yes. Both parts specify 600% minimum and 7500% maximum current transfer ratio at 1mA input current, ensuring equivalent switching performance.

Q: Is the ISP845SMT&R available in the same packaging format?

A: The ISP845SMT&R is supplied in Tape & Reel (TR) format, which is standard for surface mount production. The LTV-845S-TA packaging format is not specified in the reference data.