LMS1587CSX-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LMS1587CSX-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 3A output current in a surface-mount TO-263 (DDPAK-3) package. The device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across input voltage range, output voltage adjustability, current delivery capability, and thermal management characteristics.

Substiute Parts

LMS1587CSX-ADJ

Texas InstrumentsIn Stock: 5496LMS1587CSX-ADJ Datasheet

Current PartRFQ

LMS1587CSX-ADJ/NOPB

Texas InstrumentsIn Stock: 1633LMS1587CSX-ADJ/NOPB Datasheet

Parametric EquivalentRFQ

LT1117CM#PBF

Analog Devices Inc.In Stock: 4140LT1117CM#PBF Datasheet

MFR RecommendedRFQ

LT1117CM#TRPBF

Analog Devices Inc.In Stock: 1380LT1117CM#TRPBF Datasheet

MFR RecommendedRFQ

LT1587CM#PBF

Analog Devices Inc.In Stock: 1277LT1587CM#PBF Datasheet

MFR RecommendedRFQ

LT1587CM#TRPBF

Analog Devices Inc.In Stock: 2233LT1587CM#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LMS1587CSX-ADJ are categorized based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Output current capability (3A minimum required)
• Output voltage adjustability range (1.25V minimum, 11.7V minimum maximum)
• Input voltage tolerance (13V maximum minimum)
• Dropout voltage performance (1.3V @ 3A or better)
• Package compatibility (TO-263/DDPAK-3)
• Mounting type (Surface Mount)

Substitution Categories:

Category 1: Direct Parametric Equivalent LMS1587CSX-ADJ/NOPB maintains identical electrical specifications and package configuration as the main part. This substitute differs only in product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. Non-Compliant), making it the primary direct replacement.

Category 2: Functional Equivalents with Reduced Output Current LT1117CM#PBF and LT1117CM#TRPBF are Analog Devices linear regulators with 800mA output current. These parts share the same adjustable output voltage range (1.25V to 13.8V), package type (DDPAK-3), and operating temperature range. However, they deliver significantly lower output current (800mA vs. 3A), limiting their use to applications requiring less than 800mA.

Category 3: Functional Equivalents with Restricted Input Voltage LT1587CM#PBF and LT1587CM#TRPBF are Analog Devices linear regulators with 3A output current matching the main part's current capability. These parts maintain the same package type (DDPAK-3) and protection features (Over Current, Over Temperature, Short Circuit). However, they have a maximum input voltage of 7V compared to the main part's 13V, and a restricted output voltage maximum of 5.5V compared to 11.7V. These substitutes are suitable only for applications operating within their voltage constraints.

Parameter Comparison

Engineering Selection Recommendations

LMS1587CSX-ADJ/NOPB is the recommended primary substitute. It maintains complete electrical and mechanical compatibility with the obsolete LMS1587CSX-ADJ while offering Active product status and ROHS3 compliance. This part is suitable for all applications currently using the main part without design modifications.

LT1117CM#PBF and LT1117CM#TRPBF are suitable substitutes only for applications requiring output currents of 800mA or less. These parts offer superior input voltage tolerance (15V maximum) and improved PSRR (75 dB vs. 72 dB). The primary difference between these two is packaging: LT1117CM#PBF is supplied in Tube packaging, while LT1117CM#TRPBF is supplied in Tape & Reel format. Selection between these should be based on procurement and assembly requirements.

LT1587CM#PBF and LT1587CM#TRPBF are suitable substitutes only for applications with input voltages not exceeding 7V and output voltages not exceeding 5.5V. These parts match the 3A output current capability and include enhanced protection features (Short Circuit protection in addition to Over Current and Over Temperature). The primary difference between these two is packaging: LT1587CM#PBF is supplied in Tube packaging, while LT1587CM#TRPBF is supplied in Tape & Reel format. Selection between these should be based on procurement and assembly requirements.

All substitute parts maintain the same TO-263 (DDPAK-3) package footprint and surface-mount compatibility, requiring no PCB layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LMS1587CSX-ADJ/NOPB be used as a direct replacement for LMS1587CSX-ADJ?

A: Yes. LMS1587CSX-ADJ/NOPB is a direct parametric equivalent with identical electrical specifications, output current (3A), voltage ranges (1.25V to 11.7V), and package type (TO-263/DDPAK-3). The primary differences are product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. Non-Compliant). No design changes are required.

Q: What is the key limitation of LT1117CM#PBF and LT1117CM#TRPBF compared to the main part?

A: The LT1117 series delivers only 800mA output current compared to the LMS1587's 3A capability. These parts are suitable only for applications requiring less than 800mA. Additionally, they offer higher input voltage tolerance (15V maximum vs. 13V) and improved PSRR performance (75 dB vs. 72 dB).

Q: What are the voltage constraints of LT1587CM#PBF and LT1587CM#TRPBF?

A: The LT1587 series has a maximum input voltage of 7V and maximum output voltage of 5.5V, compared to the main part's 13V input maximum and 11.7V output maximum. These parts are suitable only for applications operating within these voltage ranges. However, they maintain the 3A output current capability and add Short Circuit protection.

Q: Are all substitute parts available in the same package type?

A: Yes. All substitute parts use the TO-263 (DDPAK-3) package, which is mechanically and electrically compatible with the main part. No PCB layout modifications are required for package compatibility.

Q: What is the difference between tube and tape & reel packaging options?

A: Tube packaging (indicated by #PBF suffix) is typically used for lower-volume orders and manual assembly. Tape & Reel packaging (indicated by #TRPBF suffix) is designed for automated pick-and-place assembly and higher-volume production. Both formats contain identical components; the selection depends on manufacturing process requirements and procurement volume.

Q: Do the substitute parts have different moisture sensitivity levels?

A: Yes. The main part and LMS1587CSX-ADJ/NOPB have MSL rating 3 (168 Hours), while all Analog Devices substitutes (LT1117 and LT1587 series) have MSL rating 1 (Unlimited). Lower MSL ratings indicate less stringent moisture handling requirements during storage and assembly.

Q: Can LT1587CM#PBF or LT1587CM#TRPBF be used in applications requiring 13V input voltage?

A: No. The LT1587 series has a maximum input voltage of 7V. Using these parts in applications requiring 13V input voltage will exceed the device's absolute maximum ratings and may cause permanent damage. For applications requiring 13V input tolerance, use LMS1587CSX-ADJ/NOPB or LT1117CM#PBF/LT1117CM#TRPBF.