LMS1587CT-ADJ/NOPB Equivalent & Substitute Parts

Part Overview

The LMS1587CT-ADJ/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This TO-220-3 package device delivers 3A output current with adjustable voltage regulation from 1.25V to 11.7V. The part is currently active in production with 1375 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative sourcing is required.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LMS1587CT-ADJ/NOPB
Category	Power Management (PMIC)
Package / Case	TO-220-3
Output Configuration	Positive
Output Type	Adjustable
Voltage - Input (Max)	13V
Voltage - Output (Min/Fixed)	1.25V
Voltage - Output (Max)	11.7V
Current - Output	3A
Voltage Dropout (Max)	1.3V @ 3A
Operating Temperature	0°C ~ 125°C
Protection Features	Over Current, Over Temperature
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the LMS1587CT-ADJ/NOPB are identified based on strict electrical and mechanical parameter compatibility. The substitution criteria are:

Critical Parameters for Substitution:

Output Configuration: Positive
Output Type: Adjustable
Package / Case: TO-220-3
Current - Output: 3A
Voltage Dropout (Max): 1.3V @ 3A
Voltage - Output (Min/Fixed): 1.25V
Operating Temperature: 0°C ~ 125°C
Mounting Type: Through Hole

Two substitute parts meet these criteria:

MFR Recommended Substitute: LT1587CT#PBF (Linear Technology) — Meets all critical electrical parameters with identical output current, dropout voltage, and adjustable voltage range. Includes additional Short Circuit protection feature.

Parametric Equivalent: LMS1587CT-ADJ (National Semiconductor) — Identical electrical specifications and package configuration to the main part, with matching input voltage maximum, output voltage range, and protection features.

Parameter Comparison

Parameter	LMS1587CT-ADJ/NOPB (TI)	LT1587CT#PBF (Linear Tech)	LMS1587CT-ADJ (National Semi)
Manufacturer	Texas Instruments	Linear Technology	National Semiconductor
Package / Case	TO-220-3	TO-220-3	TO-220-3
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	13V	7V	13V
Voltage - Output (Min/Fixed)	1.25V	1.25V	1.25V
Voltage - Output (Max)	11.7V	5.5V	11.7V
Current - Output	3A	3A	3A
Voltage Dropout (Max)	1.3V @ 3A	1.3V @ 3A	1.3V @ 3A
Current - Quiescent (Iq)	7 mA	10 mA	7 mA
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature
Mounting Type	Through Hole	Through Hole	Through Hole

Engineering Selection Recommendations

LMS1587CT-ADJ/NOPB (Texas Instruments) — Primary part. Active production status. ROHS3 compliant. Recommended for new designs and standard procurement.

LMS1587CT-ADJ (National Semiconductor) — Parametric equivalent with identical electrical specifications and TO-220-3 package. Provides direct substitution capability. Note: RoHS non-compliant and REACH affected status may restrict use in regulated applications.

LT1587CT#PBF (Linear Technology) — MFR recommended substitute. Meets all critical electrical parameters with identical 3A output current and 1.3V dropout voltage. Input voltage maximum is 7V (versus 13V for main part) and output voltage maximum is 5.5V (versus 11.7V). Includes additional Short Circuit protection. Suitable for applications within the specified voltage ranges.

Selection between substitutes depends on application input voltage requirements and compliance certifications needed for the end product.

Frequently Asked Questions (FAQ)

Q: Can LT1587CT#PBF replace LMS1587CT-ADJ/NOPB in all applications?

A: LT1587CT#PBF is electrically compatible for applications requiring input voltages up to 7V and output voltages up to 5.5V. Applications requiring higher input voltages (up to 13V) or higher output voltages (up to 11.7V) must use LMS1587CT-ADJ/NOPB or LMS1587CT-ADJ. All three parts share identical TO-220-3 package pinouts and 3A output current capability.

Q: What is the difference between LMS1587CT-ADJ and LMS1587CT-ADJ/NOPB?

A: Both parts are from Texas Instruments with identical electrical specifications. The "/NOPB" suffix indicates the packaging format. LMS1587CT-ADJ is listed as a parametric equivalent from National Semiconductor with matching specifications but different compliance status (RoHS non-compliant, REACH affected).

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the TO-220-3 package with identical pinout configuration, enabling direct PCB-level substitution without layout modifications.

Q: Which substitute part has the best protection features?

A: LT1587CT#PBF includes Over Current, Over Temperature, and Short Circuit protection. LMS1587CT-ADJ/NOPB and LMS1587CT-ADJ include Over Current and Over Temperature protection.

Q: What compliance certifications apply to each part?

A: LMS1587CT-ADJ/NOPB is ROHS3 compliant and REACH unaffected. LMS1587CT-ADJ is RoHS non-compliant and REACH affected. LT1587CT#PBF compliance information is not provided in the specification data.

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