SPX1587T-L Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The SPX1587T-L is a linear voltage regulator IC manufactured by MaxLinear, Inc., designed for positive adjustable output applications with 3A current capacity in a TO-263-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The SPX1587T-L operates across an input voltage range up to 10V with adjustable output from 1.25V to 15V, incorporating over-current and over-temperature protection features suitable for power management applications requiring stable regulated voltage delivery.

Key Parameters

Parameter	SPX1587T-L
Manufacturer	MaxLinear, Inc.
Product Status	Obsolete
Output Configuration	Positive Adjustable
Current Output	3A
Voltage Input (Max)	10V
Voltage Output (Min/Fixed)	1.25V
Voltage Output (Max)	15V
Voltage Dropout (Max)	1.2V @ 3A
PSRR	75dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-263-3 (D2PAK, 3 Leads + Tab)
Mounting Type	Surface Mount
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the SPX1587T-L is determined by the following critical parameters: output configuration (positive adjustable), current capacity (3A), package type (TO-263-3 / D2PAK), mounting method (surface mount), and functional equivalence as a linear voltage regulator. Substitute parts must maintain compatibility across these core electrical and mechanical specifications.

The substitute parts are grouped into two categories:

Direct Equivalent (Same Manufacturer): SPX1587AT-L/TR from MaxLinear, Inc., maintains identical electrical specifications and packaging, differing only in product status (active) and packaging format (Tape & Reel).

Cross-Manufacturer Equivalents: Parts from Texas Instruments (LMS1587 series), National Semiconductor (LMS1587 series), and Analog Devices Inc. (LT1587 series) provide functional equivalence with variations in input voltage range, output voltage range, quiescent current, and operating temperature specifications. All maintain the 3A output current, TO-263-3 package format, and adjustable positive output configuration.

Parameter Comparison

Parameter	SPX1587T-L	SPX1587AT-L/TR	LMS1587CS-ADJ/NOPB	LMS1587CSX-ADJ/NOPB	LMS1587IS-ADJ/NOPB	LMS1587ISX-ADJ/NOPB	LT1587CM#PBF	LT1587CM#TRPBF
Manufacturer	MaxLinear	MaxLinear	Texas Instruments	Texas Instruments	National Semiconductor	National Semiconductor	Analog Devices	Analog Devices
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Output Configuration	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable
Current Output	3A	3A	3A	3A	3A	3A	3A	3A
Voltage Input (Max)	10V	10V	13V	13V	13V	13V	7V	7V
Voltage Output (Min)	1.25V	1.25V	1.25V	1.25V	1.25V	1.25V	1.25V	1.25V
Voltage Output (Max)	15V	15V	11.7V	11.7V	11.7V	11.7V	5.5V	5.5V
Voltage Dropout (Max)	1.2V @ 3A	1.2V @ 3A	1.3V @ 3A	1.3V @ 3A	1.3V @ 3A	1.3V @ 3A	1.3V @ 3A	1.3V @ 3A
PSRR	75dB (120Hz)	75dB (120Hz)	72dB (120Hz)	72dB (120Hz)	72dB (120Hz)	72dB (120Hz)	Not Specified	Not Specified
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Package / Case	TO-263-3	TO-263-3	TO-263 (DDPAK-3)	TO-263 (DDPAK-3)	TO-263 (DDPAK-3)	TO-263 (DDPAK-3)	DDPAK-3	DDPAK-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
MSL Rating	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	Not Specified	Not Specified	1 (Unlimited)	1 (Unlimited)
RoHS Status	Not Specified	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	Not Specified	Not Specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SPX1587AT-L/TR is the direct equivalent replacement for the obsolete SPX1587T-L. Both parts are manufactured by MaxLinear, Inc., with identical electrical specifications and package format. The SPX1587AT-L/TR carries active product status and is available in Tape & Reel packaging, making it suitable for production environments requiring component continuity.

Secondary Recommendations (Cross-Manufacturer):

LMS1587CS-ADJ/NOPB and LMS1587CSX-ADJ/NOPB from Texas Instruments are functionally equivalent with ROHS3 compliance certification. These parts support higher input voltage (13V maximum) compared to the SPX1587T-L (10V maximum), providing design flexibility for applications with elevated input voltage requirements. Operating temperature range is limited to 0°C ~ 125°C, which may restrict use in extended temperature applications.

LMS1587IS-ADJ/NOPB and LMS1587ISX-ADJ/NOPB from National Semiconductor maintain the full operating temperature range (-40°C ~ 125°C) matching the original part, with identical input voltage capability (13V maximum). These parts are suitable for applications requiring extended temperature operation.

LT1587CM#PBF and LT1587CM#TRPBF from Analog Devices Inc. provide the most comprehensive protection feature set, including short-circuit protection in addition to over-current and over-temperature protection. However, these parts are limited to 7V maximum input voltage and 5.5V maximum output voltage, restricting their use to lower voltage applications. MSL rating of 1 (Unlimited) provides superior moisture handling characteristics for storage-sensitive environments.

Compliance Considerations: All active substitute parts carry RoHS3 compliance certification. The original SPX1587T-L does not specify RoHS status due to its obsolete classification. Selection should prioritize parts with documented compliance certifications for regulated applications.

Frequently Asked Questions (FAQ)

Q: Can SPX1587AT-L/TR be used as a direct drop-in replacement for SPX1587T-L?

A: Yes. SPX1587AT-L/TR is electrically and mechanically identical to SPX1587T-L, with the same TO-263-3 package, 3A output current, and adjustable output voltage range (1.25V to 15V). The primary difference is product status (active vs. obsolete) and packaging format (Tape & Reel vs. bulk).

Q: What are the key differences between MaxLinear and Texas Instruments LMS1587 parts?

A: Both maintain 3A output current and TO-263-3 packaging. Texas Instruments LMS1587 parts support higher input voltage (13V vs. 10V) but operate over a narrower temperature range (0°C ~ 125°C vs. -40°C ~ 125°C). Output voltage range is also reduced (11.7V maximum vs. 15V maximum).

Q: Are Analog Devices LT1587 parts suitable replacements?

A: LT1587 parts are functionally equivalent for adjustable positive output regulation at 3A in TO-263-3 packaging. However, they are restricted to 7V maximum input voltage and 5.5V maximum output voltage, making them suitable only for lower voltage applications. They offer enhanced protection features including short-circuit protection and superior moisture handling (MSL 1).

Q: What packaging options are available for substitute parts?

A: SPX1587AT-L/TR is available in Tape & Reel format. Texas Instruments LMS1587CS-ADJ/NOPB is supplied in Tube packaging, while LMS1587CSX-ADJ/NOPB uses Cut Tape & Digi-Reel format. National Semiconductor parts are available in Bulk packaging. Analog Devices LT1587CM#PBF is supplied in Tube, and LT1587CM#TRPBF in Tape & Reel format.

Q: Which substitute part is recommended for extended temperature applications?

A: LMS1587IS-ADJ/NOPB or LMS1587ISX-ADJ/NOPB from National Semiconductor maintain the full operating temperature range (-40°C ~ 125°C) matching the original SPX1587T-L specification. Texas Instruments and Analog Devices parts are limited to 0°C ~ 125°C operation.

Q: Do all substitute parts meet RoHS compliance requirements?

A: All active substitute parts carry RoHS3 compliance certification. The original SPX1587T-L does not specify RoHS status due to obsolescence. Designs requiring RoHS compliance should select from the active substitute parts listed.

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