LMS1587CS-3.3 Equivalent & Substitute Parts

Part Overview

The LMS1587CS-3.3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V output at 3A in a TO-263 (DDPAK-3) surface mount package. This device is classified as not for new designs, making identification of active equivalent parts essential for ongoing production and maintenance applications. The part provides over-current and over-temperature protection suitable for power management applications requiring stable 3.3V regulation.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	3A
Input Voltage (Max)	13V
Voltage Dropout (Max)	1.3V @ 3A
Quiescent Current	7 mA
Operating Temperature Range	0°C to 125°C
Package Type	TO-263 (DDPAK-3)
Protection Features	Over Current, Over Temperature
PSRR	72dB (120Hz)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Fixed output voltage of 3.3V
Output current capability of 3A or greater
Maximum input voltage of 7V or higher
Voltage dropout specification compatible with 1.3V @ 3A or lower
TO-263 (DDPAK-3) package compatibility
Operating temperature range of 0°C to 125°C
Surface mount mounting type

Parts are grouped into two categories: direct package equivalents (same packaging and output current) and functional alternatives (same electrical output with different current ratings or input voltage specifications).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout @ Rated Current	Package	Product Status	RoHS Compliance
LMS1587CS-3.3	Texas Instruments	3.3V	3A	13V	1.3V @ 3A	TO-263 (DDPAK-3)	Not For New Designs	Non-compliant
LMS1587CS-3.3/NOPB	Texas Instruments	3.3V	3A	13V	1.3V @ 3A	TO-263 (DDPAK-3)	Active	ROHS3 Compliant
LT1117CM-3.3#PBF	Analog Devices Inc.	3.3V	800mA	15V	1.2V @ 800mA	TO-263 (DDPAK-3)	Active	ROHS3 Compliant
LT1117CM-3.3#TRPBF	Analog Devices Inc.	3.3V	800mA	15V	1.2V @ 800mA	TO-263 (DDPAK-3)	Active	ROHS3 Compliant
LT1587CM-3.3#PBF	Analog Devices Inc.	3.3V	3A	7V	1.3V @ 3A	TO-263 (DDPAK-3)	Active	ROHS3 Compliant
LT1587CM-3.3#TRPBF	Analog Devices Inc.	3.3V	3A	7V	1.3V @ 3A	TO-263 (DDPAK-3)	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring direct replacement of the LMS1587CS-3.3, the LMS1587CS-3.3/NOPB is the primary equivalent, offering identical electrical specifications with active product status and ROHS3 compliance. This part maintains the same 3A output current, 1.3V dropout specification, and 13V maximum input voltage.

The LT1587CM-3.3#PBF and LT1587CM-3.3#TRPBF from Analog Devices provide full electrical equivalence with 3A output current and matching dropout characteristics. These parts differ in maximum input voltage (7V versus 13V) and are available in both tube and tape & reel packaging options. Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating.

The LT1117CM-3.3#PBF and LT1117CM-3.3#TRPBF are functional alternatives suitable only for applications where output current requirements do not exceed 800mA. These parts offer superior input voltage tolerance (15V maximum) and lower dropout voltage (1.2V @ 800mA), with improved moisture sensitivity characteristics (MSL 1 versus MSL 3).

Frequently Asked Questions (FAQ)

Q: Can the LT1117CM-3.3 series replace the LMS1587CS-3.3 in all applications?

A: The LT1117CM-3.3 series is suitable only for applications requiring 800mA or less output current. The LMS1587CS-3.3 is rated for 3A output, making the LT1117 unsuitable for higher current loads. Verify your application's maximum current draw before substitution.

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

A: Tube packaging (LT1587CM-3.3#PBF) is suitable for manual assembly and lower-volume production. Tape & reel packaging (LT1587CM-3.3#TRPBF) is designed for automated pick-and-place assembly equipment. Both contain identical die and electrical specifications; packaging choice depends on assembly methodology.

Q: Why does the LT1587CM-3.3 have a lower maximum input voltage than the LMS1587CS-3.3?

A: The LT1587CM-3.3 specifies 7V maximum input voltage while the LMS1587CS-3.3 allows 13V. Applications operating above 7V input require the LMS1587CS-3.3/NOPB or equivalent. Verify your input voltage range before selecting a substitute.

Q: Are all listed substitutes ROHS3 compliant?

A: The LMS1587CS-3.3/NOPB and all Analog Devices LT1117 and LT1587 variants listed are ROHS3 compliant. The original LMS1587CS-3.3 is not ROHS3 compliant. For new designs and applications requiring compliance certification, use only active, ROHS3-compliant alternatives.

Q: What is the significance of the #PBF and #TRPBF suffixes?

A: The #PBF suffix indicates lead-free solder ball finish in tube packaging. The #TRPBF suffix indicates lead-free solder ball finish in tape & reel packaging. Both designations confirm RoHS compliance and lead-free construction.

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