LMS1585ACSX-1.5 Equivalent & Substitute Parts

Part Overview

The LMS1585ACSX-1.5 is a linear voltage regulator IC from Texas Instruments, delivering positive fixed 1.5V output at 5A in a TO-263 (DDPAK-3) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device provides over-current and over-temperature protection suitable for power management applications requiring stable 1.5V regulation.

Key Parameters

Parameter	Value
Manufacturer Part Number	LMS1585ACSX-1.5
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.5V
Output Current	5A
Input Voltage (Max)	13V
Voltage Dropout (Max)	1.4V @ 5A
Quiescent Current	7 mA
PSRR	60 ~ 72 dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature	0°C ~ 125°C
Package / Case	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the LMS1585ACSX-1.5 are grouped based on the following critical parameters that determine functional equivalence:

Primary Equivalence Criteria:

Output voltage: 1.5V fixed
Output current capability: 5A or greater
Package type: TO-263 (DDPAK-3) surface mount
Output configuration: Positive
Protection features: Over-current and over-temperature protection
Operating temperature range: 0°C ~ 125°C minimum

Grouping Logic:

Group 1 - Direct Parametric Equivalent (Texas Instruments): LMS1585ACSX-1.5/NOPB matches all electrical specifications and packaging of the main part. The only difference is packaging format (Tape & Reel vs. bulk) and product status (Active vs. Obsolete). This part provides identical performance with improved availability and RoHS3 compliance.

Group 2 - Manufacturer Recommended Equivalents (Analog Devices Inc.): LT1585ACM-1.5#PBF, LT1585ACM-1.5#TRPBF, LT1585CM-1.5#PBF, and LT1585CM-1.5#TRPBF are Analog Devices alternatives with identical output voltage, current capability, and package type. These parts feature lower input voltage maximum (7V vs. 13V), enhanced protection (includes short-circuit protection), improved PSRR (72dB vs. 60~72dB), and superior RoHS3 compliance with MSL-1 rating. The LT1585CM variants deliver 4.6A output current, suitable for applications not requiring the full 5A specification.

Group 3 - Alternative Manufacturer Option (Richtek USA Inc.): RT9164A-15GM provides 1.5V fixed output in TO-263-3 packaging with extended operating temperature range (-40°C ~ 125°C). Output current is limited to 1A, restricting this part to lower-power applications. This option is suitable only when current requirements do not exceed 1A.

Parameter Comparison

Parameter	LMS1585ACSX-1.5	LMS1585ACSX-1.5/NOPB	LT1585ACM-1.5#PBF	LT1585ACM-1.5#TRPBF	LT1585CM-1.5#PBF	LT1585CM-1.5#TRPBF	RT9164A-15GM
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Richtek USA Inc.
Output Voltage	1.5V	1.5V	1.5V	1.5V	1.5V	1.5V	1.5V
Output Current	5A	5A	5A	5A	4.6A	4.6A	1A
Input Voltage (Max)	13V	13V	7V	7V	7V	7V	14V
Voltage Dropout (Max)	1.4V @ 5A	1.4V @ 5A	1.4V @ 5A	1.4V @ 5A	1.4V @ 4.6A	1.4V @ 4.6A	1.4V @ 1A
Quiescent Current	7 mA	7 mA	Not specified	Not specified	Not specified	Not specified	10 mA
PSRR (120Hz)	60 ~ 72 dB	60 ~ 72 dB	72 dB	72 dB	72 dB	72 dB	72 dB
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, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature
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	-40°C ~ 125°C
Package / Case	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)	TO-263-4, D2PAK (3 Leads + Tab)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)
Packaging Format	Bulk	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Bulk

Engineering Selection Recommendations

Primary Recommendation: LMS1585ACSX-1.5/NOPB is the optimal substitute. This Texas Instruments part provides identical electrical performance and packaging to the obsolete LMS1585ACSX-1.5 while offering active product status, ROHS3 compliance, and improved availability. Direct PCB layout compatibility is assured with no design modifications required.

Secondary Recommendation: LT1585ACM-1.5#TRPBF or LT1585ACM-1.5#PBF (Analog Devices Inc.) are suitable alternatives for designs requiring enhanced compliance and protection features. These parts deliver full 5A output current with superior PSRR performance (72dB fixed vs. 60~72dB range), short-circuit protection, and MSL-1 moisture sensitivity rating. The lower maximum input voltage (7V vs. 13V) must be verified against circuit requirements. Tape & Reel packaging (TRPBF variant) is recommended for high-volume production; Tube packaging (PBF variant) suits lower-volume applications.

Alternative for Reduced Current Applications: LT1585CM-1.5#TRPBF or LT1585CM-1.5#PBF deliver 4.6A output current with identical voltage regulation and protection features. These parts are suitable only when application current requirements do not exceed 4.6A.

Limited Scope Option: RT9164A-15GM from Richtek USA Inc. is restricted to applications requiring 1A or less output current. Extended operating temperature range (-40°C ~ 125°C) provides benefit for extreme temperature environments. This part is not suitable for applications requiring the full 5A specification of the original part.

Frequently Asked Questions (FAQ)

Q: Can LMS1585ACSX-1.5/NOPB be used as a direct replacement for LMS1585ACSX-1.5?

A: Yes. LMS1585ACSX-1.5/NOPB is a direct parametric equivalent with identical electrical specifications, output voltage, current rating, and TO-263 packaging. The only differences are packaging format (Tape & Reel vs. bulk) and product status (Active vs. Obsolete). No circuit modifications are required.

Q: What is the key difference between LT1585ACM and LT1585CM variants?

A: Both are Analog Devices linear regulators in TO-263 packaging with 1.5V fixed output. The LT1585ACM delivers 5A output current, matching the original part specification. The LT1585CM delivers 4.6A output current, suitable for applications with lower current requirements. Both variants are available in Tube (PBF) and Tape & Reel (TRPBF) packaging formats.

Q: Why does RT9164A-15GM have a lower output current rating?

A: RT9164A-15GM is a 1A linear regulator from Richtek USA Inc., designed for lower-power applications. This part is not suitable for designs requiring 5A output current. Selection of this part is limited to applications where load current does not exceed 1A.

Q: What is the significance of the input voltage maximum difference between Texas Instruments and Analog Devices parts?

A: LMS1585ACSX-1.5 and LMS1585ACSX-1.5/NOPB support maximum input voltage of 13V. Analog Devices LT1585 series parts (LT1585ACM and LT1585CM) support maximum input voltage of 7V. Circuit designs must verify that input voltage does not exceed 7V when substituting with Analog Devices parts. If input voltage exceeds 7V, only Texas Instruments parts are suitable.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. The original LMS1585ACSX-1.5 is RoHS non-compliant. Designs requiring RoHS3 compliance must use one of the substitute parts.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging is suitable for lower-volume applications and manual assembly. Tape & Reel (TR) packaging is designed for automated pick-and-place assembly in high-volume production. Both packaging formats contain identical components; selection depends on manufacturing process and volume requirements.

Q: Does the short-circuit protection in Analog Devices parts affect circuit design?

A: No. Short-circuit protection is an additional safety feature that does not affect normal circuit operation. This feature provides enhanced protection against fault conditions and is transparent to standard circuit design.

Q: Can I use LT1585CM-1.5#TRPBF if my application requires 5A output current?

A: No. LT1585CM-1.5#TRPBF is rated for 4.6A maximum output current. Applications requiring 5A output current must use LT1585ACM-1.5#TRPBF or LMS1585ACSX-1.5/NOPB.

Q: What is MSL rating and why does it matter?

A: MSL (Moisture Sensitivity Level) indicates how long a component can be exposed to moisture before soldering. MSL-1 (Unlimited) parts like Analog Devices LT1585 variants have no time restrictions. MSL-3 (168 Hours) parts like the original LMS1585ACSX-1.5 must be soldered within 168 hours of opening the package. Analog Devices parts offer superior moisture tolerance for extended storage.

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