LMS1587CT-3.3 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LMS1587CT-3.3 is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed 3.3V output at 3A current capacity in a TO-220-3 package. This device is classified as Last Time Buy, indicating limited availability from the original manufacturer. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications requiring 3.3V regulated power delivery with 3A output capability.

Substiute Parts

LMS1587CT-3.3

Texas InstrumentsIn Stock: 2076LMS1587CT-3.3 Datasheet

Current PartRFQ

LMS1587CT-3.3/NOPB

Texas InstrumentsIn Stock: 3103LMS1587CT-3.3/NOPB Datasheet

DirectRFQ

LD1117V33

STMicroelectronicsIn Stock: 15597LD1117V33 Datasheet

MFR RecommendedRFQ

LD1117V33C

STMicroelectronicsIn Stock: 18037LD1117V33C Datasheet

MFR RecommendedRFQ

LT1587CT-3.3#PBF

Analog Devices Inc.In Stock: 1814LT1587CT-3.3#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution validity for the LMS1587CT-3.3 is determined by the following critical parameters:

• Output Voltage: Must be fixed at 3.3V
• Output Current Capability: Minimum 3A required for direct substitution
• Package / Case: TO-220-3 form factor for mechanical and thermal compatibility
• Mounting Type: Through Hole configuration
• Protection Features: Over Current and Over Temperature protection mandatory
• Compliance: ROHS3 compliance and thermal characteristics within operating range

Substitute parts are grouped into two categories:

Category 1 - Direct Equivalents (3A Output): Parts with identical 3A output current capacity, matching input voltage specifications, and equivalent dropout characteristics. These provide seamless replacement without circuit redesign.

Category 2 - Functional Alternatives (Reduced Output Current): Parts with 800mA output current capacity. These are suitable only for applications where the actual load current does not exceed 800mA, despite the main part specification of 3A.

Parameter Comparison

Engineering Selection Recommendations

LMS1587CT-3.3/NOPB (Texas Instruments)

This part is the direct equivalent of the LMS1587CT-3.3, with identical electrical specifications and Active product status. It provides the most straightforward replacement path with no design modifications required. Current inventory availability is higher (3000 pcs) compared to the main part, ensuring supply continuity.

LT1587CT-3.3#PBF (Analog Devices Inc.)

This part matches the 3A output current and TO-220-3 package requirements. However, the maximum input voltage is limited to 7V, compared to 13V for the LMS1587CT-3.3. Selection of this part requires verification that the application input voltage does not exceed 7V. The part carries Active status and ROHS3 compliance. Use this substitute only when input voltage constraints are satisfied.

LD1117V33 and LD1117V33C (STMicroelectronics)

These parts provide 800mA output current, which is insufficient for applications requiring the full 3A capacity of the LMS1587CT-3.3. Both parts are suitable only for designs where actual load current remains below 800mA. The LD1117V33C offers extended operating temperature range (-40°C ~ 125°C) compared to the standard LD1117V33 (0°C ~ 125°C). Both carry Active status and ROHS3 compliance. Maximum input voltage is 15V, exceeding the main part specification.

Frequently Asked Questions (FAQ)

Q: Can the LD1117V33 or LD1117V33C directly replace the LMS1587CT-3.3 in all applications?

A: No. The LD1117V33 and LD1117V33C are rated for 800mA output current, while the LMS1587CT-3.3 is rated for 3A. Direct substitution is valid only if the actual circuit load current does not exceed 800mA. Exceeding this current will cause the regulator to enter current-limit protection or thermal shutdown.

Q: What is the difference between LMS1587CT-3.3 and LMS1587CT-3.3/NOPB?

A: The LMS1587CT-3.3/NOPB is the same device with the addition of "/NOPB" designation, indicating "No Plumbum" (lead-free) packaging. Both parts have identical electrical specifications. The primary difference is product status: LMS1587CT-3.3 is Last Time Buy, while LMS1587CT-3.3/NOPB is Active with higher inventory availability.

Q: Why is the LT1587CT-3.3#PBF limited to 7V input while the LMS1587CT-3.3 accepts 13V?

A: The LT1587CT-3.3#PBF is designed with a lower maximum input voltage specification. This is an inherent design characteristic of the Analog Devices part. Applications requiring input voltages above 7V must use the LMS1587CT-3.3, LMS1587CT-3.3/NOPB, or select an alternative regulator with higher input voltage rating.

Q: Are all substitute parts in the same TO-220-3 package?

A: Yes. All listed substitute parts use the TO-220-3 package, ensuring mechanical and thermal compatibility. Through-hole mounting remains consistent across all options, allowing direct PCB footprint compatibility.

Q: Which substitute part offers the best extended temperature performance?

A: The LD1117V33C provides the widest operating temperature range at -40°C ~ 125°C, compared to 0°C ~ 125°C for other parts. However, this advantage applies only to applications where 800mA output current is sufficient.

Q: Are all parts ROHS3 compliant?

A: Yes. All listed parts, including the main part and all substitutes, carry ROHS3 compliance certification, meeting environmental and regulatory requirements for lead-free manufacturing.