LM2831XSD Equivalent & Substitute Parts

Part Overview

The LM2831XSD is a buck switching regulator IC manufactured by Texas Instruments, designed for positive adjustable output applications. This device delivers 1.5A output current with an adjustable output voltage range from 0.6V to 4.5V, operating from a 3V to 5.5V input supply. The LM2831XSD is classified as Last Time Buy, indicating limited availability and the necessity to identify equivalent substitute components for ongoing design requirements and production continuity.

Substiute Parts

LM2831XSD

Texas InstrumentsIn Stock: 2306LM2831XSD Datasheet

Current PartRFQ

LM2831XSD/NOPB

National SemiconductorIn Stock: 3233LM2831XSD/NOPB Datasheet

MFR RecommendedRFQ

ST1S09IPUR

STMicroelectronicsIn Stock: 6799ST1S09IPUR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2831XSD are identified based on functional equivalence within the buck regulator category. The primary substitution criteria are:

Core Functional Parameters:

• Topology: Buck (Step-Down) switching regulator
• Output Configuration: Positive adjustable voltage
• Number of Outputs: Single output
• Mounting Type: Surface Mount
• Package Compatibility: 6-pin DFN/WDFN form factor

Electrical Operating Range:

• Input voltage range must encompass or overlap with 3V to 5.5V
• Output voltage adjustability must support the 0.6V to 4.5V range
• Output current capability must meet or exceed 1.5A

Environmental & Compliance:

• Operating temperature range: -40°C to 125°C (or compatible subset)
• RoHS3 compliance
• Surface mount packaging in 6-pin DFN/WDFN configuration

Substitutes are grouped by their ability to fulfill these criteria while maintaining functional compatibility in typical buck regulator applications.

Parameter Comparison

Engineering Selection Recommendations

LM2831XSD/NOPB (Manufacturer Recommended Substitute)

The LM2831XSD/NOPB is the direct manufacturer-recommended equivalent, produced by National Semiconductor. This part maintains identical electrical specifications, operating temperature range, and package configuration as the main LM2831XSD. The /NOPB designation indicates lead-free, RoHS-compliant packaging. With Active product status and 3202 units in stock, this substitute provides immediate design continuity with no parameter deviations. This is the preferred selection for direct replacement applications.

ST1S09IPUR (Functional Equivalent with Enhanced Specifications)

The ST1S09IPUR from STMicroelectronics is a functional buck regulator substitute with enhanced output current capability (2A versus 1.5A) and integrated synchronous rectification. This device supports a wider input voltage range (2.7V to 6V) and higher maximum output voltage (5.22V). The minimum output voltage is 0.8V, which is 0.2V higher than the LM2831XSD. The operating temperature range is narrower (-30°C to 85°C). The ST1S09IPUR is suitable for applications where the 0.8V minimum output voltage is acceptable and where the enhanced current capability provides design margin. Active product status and 6781 units in stock ensure availability.

Both substitutes are RoHS3 compliant and maintain surface mount 6-pin DFN packaging suitable for automated assembly.

Frequently Asked Questions (FAQ)

Q: Can the LM2831XSD/NOPB be used as a direct replacement for the LM2831XSD?

A: Yes. The LM2831XSD/NOPB is the manufacturer-recommended equivalent with identical electrical specifications, operating temperature range (-40°C to 125°C), and 6-WDFN package. The /NOPB designation indicates lead-free, RoHS-compliant construction. No design modifications are required.

Q: What are the key differences between the LM2831XSD and ST1S09IPUR?

A: The ST1S09IPUR has higher output current (2A versus 1.5A), integrated synchronous rectification, and a wider input voltage range (2.7V to 6V). However, the minimum output voltage is 0.8V instead of 0.6V, and the operating temperature range is narrower (-30°C to 85°C versus -40°C to 125°C). The switching frequency is 1.5MHz versus 1.6MHz.

Q: Is the ST1S09IPUR suitable for applications requiring 0.6V output?

A: No. The ST1S09IPUR has a minimum adjustable output voltage of 0.8V. Applications requiring 0.6V output must use the LM2831XSD or LM2831XSD/NOPB.

Q: Are both substitutes available in the same package?

A: Both are 6-pin DFN packages with exposed pads. The LM2831XSD/NOPB uses 6-WDFN (3x3), while the ST1S09IPUR uses 6-VDFN (3x3). These are mechanically compatible for PCB layout purposes, though pin assignments must be verified against respective datasheets.

Q: What is the product status significance?

A: The LM2831XSD is Last Time Buy, indicating limited future availability. The LM2831XSD/NOPB and ST1S09IPUR are both Active products with confirmed stock levels, ensuring long-term supply continuity.

Q: Are both substitutes RoHS3 compliant?

A: The LM2831XSD/NOPB compliance status is not specified in available data. The ST1S09IPUR is confirmed RoHS3 compliant. Verify RoHS compliance requirements with your supplier for the LM2831XSD/NOPB.