SPX1585AT-L Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The SPX1585AT-L is a linear voltage regulator IC from MaxLinear, Inc., designed for positive adjustable output applications with 5A current capability in a TO-263-3 surface mount package. This part is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	SPX1585AT-L
Manufacturer	MaxLinear, Inc.
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	10V
Voltage - Output (Min/Fixed)	1.2V
Voltage - Output (Max)	8.8V
Voltage Dropout (Max)	1.2V @ 5A
Current - Output	5A
Protection Features	Over Current, Over Temperature, Reverse Polarity, Transient Voltage
Operating Temperature	-45°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the SPX1585AT-L is determined by the following critical parameters:

Output configuration (Positive)
Output type (Adjustable)
Current rating (5A nominal)
Package type (TO-263 / DDPAK-3 surface mount)
Voltage range compatibility (input and output specifications)
Protection features (Over Current, Over Temperature minimum)

The substitute parts listed below meet these core electrical and mechanical requirements within the allowed parameter ranges specified in the input data.

Parameter Comparison

Parameter	SPX1585AT-L	LMS1585ACSX-ADJ/NOPB	LT1585CM#PBF	LT1585CM#TRPBF
Manufacturer	MaxLinear, Inc.	National Semiconductor	Analog Devices Inc.	Analog Devices Inc.
Output Configuration	Positive	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable
Number of Regulators	1	1	1	1
Voltage - Input (Max)	10V	13V	7V	7V
Voltage - Output (Min/Fixed)	1.2V	1.25V	1.25V	1.25V
Voltage - Output (Max)	8.8V	11.6V	5.5V	5.5V
Voltage Dropout (Max)	1.2V @ 5A	1.4V @ 5A	1.4V @ 4.6A	1.4V @ 4.6A
Current - Output	5A	5A	4.6A	4.6A
Operating Temperature	-45°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
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)
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	RoHS Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LMS1585ACSX-ADJ/NOPB (National Semiconductor) is the manufacturer-recommended substitute. This part maintains 5A output current capability, supports adjustable output configuration, and is actively available. The higher maximum input voltage (13V vs. 10V) and output voltage range (11.6V vs. 8.8V) provide extended operational flexibility. Product status is Active with 2353 units in stock.

LT1585CM#PBF and LT1585CM#TRPBF (Analog Devices Inc.) are alternative substitutes with Active product status and ROHS3 compliance. Both variants use identical electrical specifications and differ only in packaging format (Tube vs. Tape & Reel). Output current is rated at 4.6A, which is lower than the SPX1585AT-L specification of 5A. Maximum input voltage is limited to 7V compared to the original 10V. These parts are suitable for applications where the reduced current and voltage ratings are acceptable. Both variants include Short Circuit protection in addition to Over Current and Over Temperature protection.

All substitute parts share the same TO-263 / DDPAK-3 surface mount package footprint and are pin-compatible with the original SPX1585AT-L.

Frequently Asked Questions (FAQ)

Q: Can LT1585CM#PBF be used as a direct replacement for SPX1585AT-L?

A: LT1585CM#PBF is electrically compatible for adjustable positive output regulation in the same TO-263 package. However, the output current rating is 4.6A versus 5A for the SPX1585AT-L, and maximum input voltage is 7V versus 10V. Substitution is valid only if your application does not require the full 5A output current or input voltages above 7V.

Q: What is the difference between LT1585CM#PBF and LT1585CM#TRPBF?

A: Both parts have identical electrical specifications and pin configurations. The difference is packaging format: LT1585CM#PBF is supplied in Tube packaging, while LT1585CM#TRPBF is supplied in Tape & Reel (TR) format. Selection depends on your procurement and assembly requirements.

Q: Is LMS1585ACSX-ADJ/NOPB the best substitute?

A: LMS1585ACSX-ADJ/NOPB is the manufacturer-recommended substitute and maintains the full 5A output current specification. It also supports a higher maximum input voltage (13V) and output voltage range (11.6V), providing greater design margin. This part is the preferred choice when full electrical compatibility is required.

Q: Are all substitute parts RoHS compliant?

A: The original SPX1585AT-L is RoHS Compliant. LT1585CM#PBF and LT1585CM#TRPBF are ROHS3 Compliant. RoHS compliance status for LMS1585ACSX-ADJ/NOPB is not specified in the available data.

Q: Do all substitute parts support the same operating temperature range?

A: No. The SPX1585AT-L operates from -45°C to 125°C. All three substitute parts operate from 0°C to 125°C, which is a narrower range. Applications requiring operation below 0°C cannot use these substitutes.

Q: Are the substitute parts pin-compatible with SPX1585AT-L?

A: Yes. All substitute parts use the TO-263 / DDPAK-3 surface mount package with identical pinout and footprint compatibility with the SPX1585AT-L.

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