LMS1587IS-1.5 Equivalent & Substitute Parts

Part Overview

The LMS1587IS-1.5 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 1.5V output at 3A in a surface-mount TO-263 (DDPAK-3) package. This part is classified as Last Time Buy, indicating end-of-life status. Finding equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 1.5V regulated power delivery with 3A output capability.

Key Parameters

Parameter	Value
Manufacturer Part Number	LMS1587IS-1.5
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.5V
Output Current	3A
Input Voltage (Max)	13V
Voltage Dropout (Max)	1.3V @ 3A
Package / Case	TO-263-4, D2PAK (3 Leads + Tab)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the LMS1587IS-1.5 is determined by the following critical parameters:

Fixed output voltage of 1.5V
Output current capability of 3A (or higher)
Surface-mount package compatibility (TO-263 / DDPAK-3)
Maximum input voltage rating of 13V or greater
Operating temperature range of -40°C to 125°C (or compatible subset)
Protection features including over-current and over-temperature
ROHS3 compliance and REACH unaffected status

Substitute parts are grouped into two categories: direct equivalents from Texas Instruments and manufacturer-recommended alternatives from Analog Devices Inc. and Richtek USA Inc. The RT9164A-15GM is included as a functional alternative despite lower current rating (1A vs. 3A) due to matching voltage output and package compatibility, though application-specific current requirements must be verified.

Parameter Comparison

Parameter	LMS1587IS-1.5	LMS1587IS-1.5/NOPB	LT1587CM-1.5#PBF	LT1587CM-1.5#TRPBF	RT9164A-15GM
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Richtek USA Inc.
Output Voltage (Fixed)	1.5V	1.5V	1.5V	1.5V	1.5V
Output Current	3A	3A	3A	3A	1A
Input Voltage (Max)	13V	13V	7V	7V	14V
Voltage Dropout (Max)	1.3V @ 3A	1.3V @ 3A	1.3V @ 3A	1.3V @ 3A	1.4V @ 1A
Package / Case	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	-40°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 Current, Over Temperature
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Full Compatibility):

LMS1587IS-1.5/NOPB is the direct equivalent from Texas Instruments with identical electrical specifications and active product status. This part is the preferred replacement for end-of-life LMS1587IS-1.5 applications.

LT1587CM-1.5#PBF and LT1587CM-1.5#TRPBF are manufacturer-recommended alternatives from Analog Devices Inc., offering identical output voltage and current ratings with enhanced protection features (short-circuit protection). Both parts are active and ROHS3 compliant. The primary difference is packaging: LT1587CM-1.5#PBF is supplied in Tube packaging, while LT1587CM-1.5#TRPBF is supplied in Tape & Reel format. Note that maximum input voltage is reduced to 7V compared to the original 13V specification.

Secondary Substitute (Current-Limited Application):

RT9164A-15GM from Richtek USA Inc. provides 1.5V fixed output in the same TO-263 package with active product status and ROHS3 compliance. This part is suitable only for applications requiring 1A or less output current. Maximum input voltage is 14V, exceeding the original specification. Operating temperature range matches the original part (-40°C to 125°C).

Frequently Asked Questions (FAQ)

Q: Can LT1587CM-1.5#PBF directly replace LMS1587IS-1.5 in all applications?

A: LT1587CM-1.5#PBF matches the output voltage (1.5V) and current rating (3A) with identical package (TO-263 / DDPAK-3). However, the maximum input voltage is reduced from 13V to 7V. Verify that your input voltage does not exceed 7V before substitution. The part includes additional short-circuit protection not present in the original.

Q: What is the difference between LT1587CM-1.5#PBF and LT1587CM-1.5#TRPBF?

A: Both parts are electrically identical with matching specifications. The difference is packaging format: LT1587CM-1.5#PBF is supplied in Tube packaging for manual handling and lower-volume applications, while LT1587CM-1.5#TRPBF is supplied in Tape & Reel format for automated assembly processes. Select based on your manufacturing process requirements.

Q: Is RT9164A-15GM a suitable replacement for the LMS1587IS-1.5?

A: RT9164A-15GM is functionally compatible only for applications requiring 1A or less output current. The original LMS1587IS-1.5 delivers 3A. If your circuit requires the full 3A output capability, RT9164A-15GM is not suitable. For 1A applications, it provides active product status and ROHS3 compliance in the same TO-263 package.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. LMS1587IS-1.5/NOPB, LT1587CM-1.5#PBF, LT1587CM-1.5#TRPBF, and RT9164A-15GM are all ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the operating temperature range for each substitute?

A: LMS1587IS-1.5/NOPB and RT9164A-15GM operate from -40°C to 125°C, matching the original part. LT1587CM-1.5#PBF and LT1587CM-1.5#TRPBF operate from 0°C to 125°C, with a reduced lower temperature limit. Verify that your application does not require operation below 0°C before selecting Analog Devices alternatives.

Q: Why is the maximum input voltage different between substitutes?

A: Input voltage ratings are determined by the regulator design and internal protection circuitry. LMS1587IS-1.5 and LMS1587IS-1.5/NOPB support 13V maximum input. LT1587CM-1.5#PBF and LT1587CM-1.5#TRPBF support 7V maximum input. RT9164A-15GM supports 14V maximum input. Confirm your circuit's input voltage does not exceed the substitute part's rating.

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