SPX1587AT-L-3-3 Equivalent & Substitute Parts

Part Overview

The SPX1587AT-L-3-3 is a linear voltage regulator IC manufactured by MaxLinear, Inc., designed to deliver a fixed 3.3V output at 3A in a TO-263-3 surface mount package. This part is classified as a Power Management PMIC and has been discontinued at DiGi Electronics. Due to its discontinued status, identifying equivalent and substitute parts is essential for design continuity, production planning, and long-term component sourcing strategies.

Substiute Parts

SPX1587AT-L-3-3

MaxLinear, Inc.In Stock: 1206SPX1587AT-L-3-3 Datasheet

Current PartRFQ

LMS1587IS-3.3/NOPB

Texas InstrumentsIn Stock: 87653LMS1587IS-3.3/NOPB Datasheet

MFR RecommendedRFQ

LMS1587ISX-3.3/NOPB

Texas InstrumentsIn Stock: 1835LMS1587ISX-3.3/NOPB Datasheet

MFR RecommendedRFQ

LT1085CM-3.3#PBF

Analog Devices Inc.In Stock: 1426LT1085CM-3.3#PBF Datasheet

MFR RecommendedRFQ

LT1085CM-3.3#TRPBF

Analog Devices Inc.In Stock: 1939LT1085CM-3.3#TRPBF Datasheet

MFR RecommendedRFQ

LT1587CM-3.3#PBF

Analog Devices Inc.In Stock: 1120LT1587CM-3.3#PBF Datasheet

MFR RecommendedRFQ

LT1587CM-3.3#TRPBF

Analog Devices Inc.In Stock: 1683LT1587CM-3.3#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPX1587AT-L-3-3 are selected based on the following critical parameters that determine functional equivalence:

• Output Voltage: Fixed 3.3V output (all substitutes match this requirement)
• Output Current: 3A continuous output capability
• Package Type: TO-263-3 / D2PAK-3 surface mount package
• Input Voltage Range: Maximum input voltage of 10V or higher
• Voltage Dropout: Maximum dropout voltage at 3A output
• Operating Temperature: -40°C to 125°C range or compatible subset
• Protection Features: Over current and over temperature protection
• RoHS Compliance: ROHS3 or equivalent compliance status

The substitute parts are grouped into two categories based on manufacturer and electrical characteristics:

Category 1: Texas Instruments LMS1587 Series

• LMS1587IS-3.3/NOPB
• LMS1587ISX-3.3/NOPB

Category 2: Analog Devices LT1085 and LT1587 Series

• LT1085CM-3.3#PBF
• LT1085CM-3.3#TRPBF
• LT1587CM-3.3#PBF
• LT1587CM-3.3#TRPBF

Parameter Comparison

Engineering Selection Recommendations

Texas Instruments LMS1587 Series (LMS1587IS-3.3/NOPB, LMS1587ISX-3.3/NOPB)

These parts provide the closest electrical match to the SPX1587AT-L-3-3 with active product status and ROHS3 compliance. The LMS1587 series maintains the same 3A output current, -40°C to 125°C operating range, and dual protection features (over current and over temperature). Input voltage tolerance extends to 13V, providing additional design margin. The primary difference is a 0.1V increase in maximum dropout voltage (1.3V vs. 1.2V). Both packaging options (tube and cut tape/digi-reel) are available with substantial inventory levels.

Analog Devices LT1085 Series (LT1085CM-3.3#PBF, LT1085CM-3.3#TRPBF)

The LT1085 series offers superior input voltage tolerance (20V maximum) and improved moisture sensitivity rating (MSL 1 vs. MSL 3). However, the operating temperature range is limited to 0°C to 125°C, and over current protection is not included. The dropout voltage is higher at 1.5V. These parts are suitable for applications with higher input voltage requirements and less stringent low-temperature operation.

Analog Devices LT1587 Series (LT1587CM-3.3#PBF, LT1587CM-3.3#TRPBF)

The LT1587 series provides enhanced protection features including short circuit protection in addition to over current and over temperature protection. Input voltage is limited to 7V maximum, making these parts suitable only for applications with lower input voltage specifications. Operating temperature range is 0°C to 125°C. MSL rating is 1 (unlimited), indicating superior moisture resistance. Quiescent current and PSRR specifications are not provided in the data.

All substitute parts maintain ROHS3 compliance and are currently in active production status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SPX1587AT-L-3-3 with any of the listed substitutes?

A: Direct replacement depends on your specific application requirements. All listed substitutes share the same 3.3V fixed output, 3A current capability, and TO-263-3 package footprint. However, differences in input voltage range, dropout voltage, operating temperature, and protection features must be evaluated against your circuit design specifications.

Q: What is the key difference between the Texas Instruments and Analog Devices options?

A: Texas Instruments LMS1587 series maintains the closest electrical specifications to the original SPX1587AT-L-3-3, including the -40°C to 125°C operating range and dual protection features. Analog Devices LT1085 and LT1587 series offer different trade-offs: LT1085 provides higher input voltage tolerance (20V) but limited low-temperature operation (0°C minimum), while LT1587 adds short circuit protection but restricts input voltage to 7V.

Q: Are there packaging differences between these substitutes?

A: All substitutes use the same TO-263-3 / D2PAK-3 surface mount package with identical pinout and footprint. Packaging options differ in tape format: tube packaging, cut tape with digi-reel, or tape and reel. These are supply chain variations and do not affect electrical or mechanical compatibility.

Q: Which substitute has the best availability?

A: Texas Instruments LMS1587IS-3.3/NOPB has the highest reported inventory at 87,600 pieces. LMS1587ISX-3.3/NOPB has 1,803 pieces available. Analog Devices parts range from 1,103 to 1,929 pieces in stock. Availability should be verified with your component supplier for current stock levels.

Q: What is the significance of the MSL rating difference?

A: MSL (Moisture Sensitivity Level) indicates how long a component can be stored in standard conditions before requiring baking before reflow soldering. SPX1587AT-L-3-3 and LMS1587 series have MSL 3 (168 hours), while Analog Devices parts have MSL 1 (unlimited storage). MSL 1 provides greater flexibility in inventory management and reduces risk of moisture-induced failures during assembly.

Q: Can I use LT1085 or LT1587 if my application requires -40°C operation?

A: No. Both Analog Devices series are rated for 0°C to 125°C operation only. If your application requires -40°C minimum operating temperature, you must select either the original SPX1587AT-L-3-3 (if available from inventory) or the Texas Instruments LMS1587 series, both of which support the full -40°C to 125°C range.

Q: What does "discontinued at DiGi Electronics" mean for the SPX1587AT-L-3-3?

A: This indicates the part is no longer actively stocked or supported by DiGi Electronics as a distributor. The part may still be available from other distributors, secondary markets, or manufacturer inventory, but new designs should transition to active alternatives to ensure long-term supply chain viability.