LMS1587CS-ADJ Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LMS1587CS-ADJ is a linear voltage regulator IC manufactured by Texas Instruments, designed for positive adjustable output applications requiring 3A current capacity in a DDPAK-3 surface mount package. This part is classified as Last Time Buy, indicating limited availability from the original manufacturer. Finding equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	LMS1587CS-ADJ
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Current - Output	3A
Voltage - Input (Max)	13V
Voltage - Output (Min/Fixed)	1.25V
Voltage - Output (Max)	11.7V
Voltage Dropout (Max)	1.3V @ 3A
Package / Case	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
Operating Temperature	0°C ~ 125°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LMS1587CS-ADJ is determined by the following critical parameters:

Primary Substitution Criteria:

Output current capacity: 3A minimum
Output voltage range: Adjustable from 1.25V minimum
Package type: DDPAK-3 (TO-263) surface mount
Input voltage rating: Minimum 13V
Protection features: Over current and over temperature protection
Operating temperature range: 0°C to 125°C
RoHS3 compliance

Substitution Categories:

Direct Equivalent (Identical Specifications): LMS1587CS-ADJ/NOPB - Texas Instruments variant with identical electrical and mechanical specifications, differing only in packaging configuration (NOPB designation).
Functional Equivalent with Reduced Current Rating: LT1117CM#PBF and LT1117CM#TRPBF - Analog Devices parts with 800mA output current (lower than 3A requirement). These are suitable only for applications not requiring full 3A capacity.
Functional Equivalent with Matching Current Rating: LT1587CM#PBF and LT1587CM#TRPBF - Analog Devices parts with 3A output current matching the original specification. Input voltage rating is lower (7V vs. 13V), limiting applicability to lower input voltage designs.

Parameter Comparison

Parameter	LMS1587CS-ADJ	LMS1587CS-ADJ/NOPB	LT1117CM#PBF	LT1117CM#TRPBF	LT1587CM#PBF	LT1587CM#TRPBF
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Current - Output	3A	3A	800mA	800mA	3A	3A
Voltage - Input (Max)	13V	13V	15V	15V	7V	7V
Voltage - Output (Min/Fixed)	1.25V	1.25V	1.25V	1.25V	1.25V	1.25V
Voltage - Output (Max)	11.7V	11.7V	13.8V	13.8V	5.5V	5.5V
Voltage Dropout (Max)	1.3V @ 3A	1.3V @ 3A	1.2V @ 800mA	1.2V @ 800mA	1.3V @ 3A	1.3V @ 3A
Package / Case	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement: LMS1587CS-ADJ/NOPB is the primary substitute, offering identical electrical specifications and operating characteristics. This part maintains full compatibility with existing designs and is currently in active production status with adequate inventory (1355 pcs).

Tier 2 - Functional Equivalent (3A Current Requirement): LT1587CM#PBF and LT1587CM#TRPBF (Analog Devices) provide 3A output current matching the original specification. Selection between these depends on packaging requirements: tube packaging (LT1587CM#PBF) or tape & reel (LT1587CM#TRPBF). Note that maximum input voltage is limited to 7V, restricting use to designs with lower input voltage rails. Both parts are ROHS3 compliant and in active production.

Tier 3 - Reduced Current Capacity: LT1117CM#PBF and LT1117CM#TRPBF (Analog Devices) provide only 800mA output current. These are suitable only for applications where the full 3A capacity is not required. These parts offer higher input voltage rating (15V) and improved PSRR (75dB vs. 72dB). Selection between tube and tape & reel packaging applies here as well.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and are suitable for applications requiring environmental regulatory adherence. Moisture sensitivity levels vary: LMS1587CS-ADJ/NOPB carries MSL-3, while Analog Devices parts carry MSL-1 (unlimited shelf life).

Frequently Asked Questions (FAQ)

Q: Can LT1117CM#PBF replace LMS1587CS-ADJ in all applications? A: No. LT1117CM#PBF has 800mA output current versus the 3A requirement of LMS1587CS-ADJ. Use this substitute only if your application requires less than 800mA output current.

Q: What is the difference between LT1587CM#PBF and LT1587CM#TRPBF? A: Both parts have identical electrical specifications. The difference is packaging: LT1587CM#PBF is supplied in tube packaging, while LT1587CM#TRPBF is supplied in tape & reel format for automated assembly processes.

Q: Why does LT1587CM#PBF have a lower maximum input voltage (7V) than LMS1587CS-ADJ (13V)? A: These are different product variants within the LT1587 family. The lower input voltage rating restricts LT1587CM#PBF to designs with input voltages not exceeding 7V. Verify your input voltage requirements before selecting this substitute.

Q: Is LMS1587CS-ADJ/NOPB a direct replacement for LMS1587CS-ADJ? A: Yes. LMS1587CS-ADJ/NOPB is electrically and mechanically identical to LMS1587CS-ADJ. The /NOPB designation indicates lead-free plating without additional performance implications.

Q: What does "Last Time Buy" status mean for LMS1587CS-ADJ? A: Last Time Buy indicates Texas Instruments will discontinue this part. Existing inventory is limited, and no future production is planned. LMS1587CS-ADJ/NOPB is the recommended transition path as it maintains identical specifications while remaining in active production.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All parts listed—LMS1587CS-ADJ/NOPB, LT1117CM#PBF, LT1117CM#TRPBF, LT1587CM#PBF, and LT1587CM#TRPBF—are ROHS3 compliant.

Q: Can I use LT1117CM#TRPBF if I need 3A output current? A: No. LT1117CM#TRPBF is rated for 800mA maximum output current. For 3A applications, use LT1587CM#TRPBF or LMS1587CS-ADJ/NOPB.

Q: What is the difference in PSRR between LMS1587CS-ADJ and LT1117CM#PBF? A: LMS1587CS-ADJ has 72dB PSRR at 120Hz, while LT1117CM#PBF has 75dB PSRR at 120Hz. The LT1117 variant provides slightly better power supply rejection ratio performance.

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