LMS1587IS-ADJ Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LMS1587IS-ADJ is a linear voltage regulator IC manufactured by Texas Instruments, designed for positive adjustable output applications requiring 3A current capacity. This surface-mount component operates in the TO-263 (DDPAK-3) package and is classified as Last Time Buy, indicating discontinued production. The device provides adjustable output voltage from 1.25V to 11.7V with a maximum input voltage of 13V and includes over-current and over-temperature protection features. Due to its Last Time Buy status, identifying equivalent and substitute parts is essential for design continuity and long-term supply chain management.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LMS1587IS-ADJ
Category	Power Management (PMIC)
Package Type	TO-263-4, D2PAK (3 Leads + Tab)
Output Configuration	Positive Adjustable
Current Output	3A
Voltage Input (Max)	13V
Voltage Output (Min)	1.25V
Voltage Output (Max)	11.7V
Voltage Dropout (Max)	1.3V @ 3A
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the LMS1587IS-ADJ is determined by the following critical parameters:

Primary Substitution Criteria:

Output configuration: Positive adjustable
Package type: TO-263-4 / D2PAK (3 Leads + Tab) / TO-263AA
Mounting type: Surface mount
Output voltage range: Minimum 1.25V adjustable capability
Current output capacity: Minimum 3A
Voltage dropout: Maximum 1.3V @ 3A
Protection features: Over-current and over-temperature protection
Operating temperature range: Support for -40°C ~ 125°C or compatible subset
RoHS compliance: ROHS3 Compliant

Substitute Parts Identified:

LMS1587IS-ADJ/NOPB (National Semiconductor) – Direct equivalent with identical electrical specifications and packaging. Product Status: Active.
LT1587CM#PBF and LT1587CM#TRPBF (Analog Devices Inc.) – Compatible substitutes with matching 3A output current, adjustable output voltage (1.25V minimum), DDPAK-3 packaging, and equivalent protection features. Packaging variants: Tube and Tape & Reel.
LT1117CM#PBF and LT1117CM#TRPBF (Analog Devices Inc.) – Partial substitutes with reduced output current (800mA vs. 3A) and higher maximum input voltage (15V vs. 13V). These are suitable only for applications not requiring the full 3A output capacity.

Parameter Comparison

Parameter	LMS1587IS-ADJ	LMS1587IS-ADJ/NOPB	LT1587CM#PBF	LT1587CM#TRPBF	LT1117CM#PBF	LT1117CM#TRPBF
Manufacturer	Texas Instruments	National Semiconductor	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Product Status	Last Time Buy	Active	Active	Active	Active	Active
Output Configuration	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable
Current Output	3A	3A	3A	3A	800mA	800mA
Voltage Input (Max)	13V	13V	7V	7V	15V	15V
Voltage Output (Min)	1.25V	1.25V	1.25V	1.25V	1.25V	1.25V
Voltage Output (Max)	11.7V	11.7V	5.5V	5.5V	13.8V	13.8V
Voltage Dropout (Max)	1.3V @ 3A	1.3V @ 3A	1.3V @ 3A	1.3V @ 3A	1.2V @ 800mA	1.2V @ 800mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Temperature	Over Temperature
Package Type	TO-263-4, D2PAK (3 Leads + Tab)	TO-263-4, D2PAK (3 Leads + Tab)	TO-263-4, D2PAK (3 Leads + Tab)	TO-263-4, D2PAK (3 Leads + Tab)	TO-263-4, D2PAK (3 Leads + Tab)	TO-263-4, D2PAK (3 Leads + Tab)
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	Not specified	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Tier 1 – Direct Equivalent: LMS1587IS-ADJ/NOPB is the primary substitute, offering identical electrical specifications and packaging. This part maintains Active product status, ensuring long-term availability and supply chain stability compared to the Last Time Buy status of the original LMS1587IS-ADJ.

Tier 2 – Full-Specification Compatible: LT1587CM#PBF and LT1587CM#TRPBF (Analog Devices Inc.) provide complete functional equivalence with 3A output current, adjustable voltage regulation, and DDPAK-3 packaging. Both variants are ROHS3 compliant and Active. The primary difference is packaging format: Tube for LT1587CM#PBF and Tape & Reel for LT1587CM#TRPBF. Selection between these depends on procurement and assembly requirements.

Tier 3 – Current-Limited Substitutes: LT1117CM#PBF and LT1117CM#TRPBF are suitable only for applications where output current requirements do not exceed 800mA. These parts offer higher maximum input voltage (15V) and improved moisture sensitivity (MSL 1 vs. MSL 3), but reduced current capacity makes them unsuitable for designs requiring the full 3A specification of the LMS1587IS-ADJ.

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance and EAR99 export classification. Designs operating at the lower temperature extreme (-40°C) should note that LT1587 and LT1117 variants specify 0°C minimum operating temperature, which may require thermal analysis for cold-environment applications.

Frequently Asked Questions (FAQ)

Q: Can LT1117CM#PBF replace LMS1587IS-ADJ in all applications? A: No. LT1117CM#PBF has a maximum output current of 800mA, while LMS1587IS-ADJ provides 3A. Use LT1117 only if your application requires less than 800mA output current. For 3A applications, use LT1587CM#PBF or LMS1587IS-ADJ/NOPB.

Q: What is the difference between LT1587CM#PBF and LT1587CM#TRPBF? A: Both parts are electrically identical. The difference is packaging: LT1587CM#PBF is supplied in Tube packaging, while LT1587CM#TRPBF is supplied in Tape & Reel format. Select based on your assembly process requirements.

Q: Is LMS1587IS-ADJ/NOPB a direct replacement for LMS1587IS-ADJ? A: Yes. LMS1587IS-ADJ/NOPB is a direct equivalent with identical electrical specifications, output current (3A), voltage ranges, and DDPAK-3 packaging. The primary advantage is Active product status versus Last Time Buy.

Q: Can I use LT1117CM#TRPBF in a -40°C environment? A: No. LT1117CM#TRPBF specifies a minimum operating temperature of 0°C. For applications requiring -40°C operation, use LMS1587IS-ADJ, LMS1587IS-ADJ/NOPB, or LT1587CM variants, which support -40°C to 0°C minimum operating temperatures.

Q: What are the key parameters that determine substitution compatibility? A: The critical parameters are: output current capacity (minimum 3A for full compatibility), adjustable output voltage range (1.25V minimum), DDPAK-3 package type, voltage dropout specification (1.3V @ 3A), and protection features (over-current and over-temperature). Deviations in any of these parameters may affect circuit performance.

Q: Are all substitute parts ROHS3 compliant? A: Yes. LMS1587IS-ADJ/NOPB, LT1587CM#PBF, LT1587CM#TRPBF, LT1117CM#PBF, and LT1117CM#TRPBF are all ROHS3 compliant. This ensures compatibility with modern manufacturing and environmental regulations.

Q: What is the moisture sensitivity difference between LMS1587IS-ADJ and LT1587 variants? A: LMS1587IS-ADJ has MSL 3 (168 hours), while LT1587 and LT1117 variants have MSL 1 (unlimited). MSL 1 provides superior moisture resistance and longer shelf life without baking requirements.

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