LMS1587CT-1.5 Equivalent & Substitute Parts

Part Overview

The LMS1587CT-1.5 is a linear voltage regulator IC from Texas Instruments, designed to deliver a fixed positive output of 1.5V at 3A in a TO-220-3 package. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement. The LMS1587CT-1.5 provides over-current and over-temperature protection, operating across a temperature range of 0°C to 125°C with a maximum input voltage of 13V and a dropout voltage of 1.3V at full load.

Substiute Parts

LMS1587CT-1.5

Texas InstrumentsIn Stock: 2429LMS1587CT-1.5 Datasheet

Current PartRFQ

LT1587CT-1.5#PBF

Linear TechnologyIn Stock: 1404LT1587CT-1.5#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LMS1587CT-1.5 is determined by strict alignment of the following critical parameters:

• Fixed output voltage of 1.5V
• Output current capability of 3A minimum
• TO-220-3 package configuration
• Positive output configuration
• Single regulator topology
• Operating temperature range of 0°C to 125°C minimum
• Dropout voltage specification of 1.3V @ 3A or lower
• Over-current and over-temperature protection

The LT1587CT-1.5#PBF from Linear Technology meets all substitution criteria. While the LT1587CT-1.5#PBF specifies a lower maximum input voltage (7V versus 13V), it maintains identical output specifications, package form factor, and protection features. The LT1587CT-1.5#PBF additionally provides short-circuit protection, exceeding the protection feature set of the original part.

Parameter Comparison

Engineering Selection Recommendations

The LT1587CT-1.5#PBF is the direct functional equivalent for the obsolete LMS1587CT-1.5. Selection of the LT1587CT-1.5#PBF is supported by the following factors:

• Active product status ensures long-term availability and supply chain continuity
• Identical electrical output specifications (1.5V, 3A) and package form factor enable direct pin-compatible replacement
• Matching dropout voltage and operating temperature range maintain system performance characteristics
• Enhanced protection feature set (addition of short-circuit protection) provides improved reliability
• ECCN and HTSUS classifications remain consistent between parts

The reduced maximum input voltage specification (7V versus 13V) of the LT1587CT-1.5#PBF requires verification that system input voltage does not exceed 7V. If the application requires input voltages exceeding 7V, alternative solutions must be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the LT1587CT-1.5#PBF directly replace the LMS1587CT-1.5 in existing designs?

A: Yes, the LT1587CT-1.5#PBF provides direct pin-compatible replacement in TO-220-3 package configurations. Both devices deliver 1.5V at 3A with identical dropout voltage specifications and operating temperature ranges. No circuit modifications are required for package or pinout compatibility.

Q: What is the significance of the lower maximum input voltage on the LT1587CT-1.5#PBF?

A: The LT1587CT-1.5#PBF specifies a maximum input voltage of 7V compared to 13V for the LMS1587CT-1.5. Applications operating at input voltages below 7V are unaffected. Systems requiring input voltages between 7V and 13V must be redesigned or alternative regulators must be selected.

Q: Are there differences in protection features between these parts?

A: The LT1587CT-1.5#PBF includes short-circuit protection in addition to the over-current and over-temperature protection present in the LMS1587CT-1.5. This represents an enhancement to the protection feature set.

Q: What is the product status significance?

A: The LMS1587CT-1.5 is classified as obsolete, indicating discontinued manufacturing and limited availability. The LT1587CT-1.5#PBF maintains active product status, ensuring ongoing availability and manufacturing support.

Q: Are there compliance or certification differences?

A: Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications. The LMS1587CT-1.5 is ROHS3 compliant; RoHS status for the LT1587CT-1.5#PBF is not specified in available documentation.