LM2831ZSD Equivalent & Substitute Parts

Part Overview

The LM2831ZSD is a buck switching regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 1.5A output current with an adjustable voltage range from 0.6V to 4.5V, operating from a 3V to 5.5V input supply. The device is classified as obsolete, which necessitates identification of equivalent and substitute parts for new designs or production continuity.

Substiute Parts

LM2831ZSD

Texas InstrumentsIn Stock: 9751LM2831ZSD Datasheet

Current PartRFQ

LM2831ZSD/NOPB

Texas InstrumentsIn Stock: 2260LM2831ZSD/NOPB Datasheet

DirectRFQ

ST1S09IPUR

STMicroelectronicsIn Stock: 6799ST1S09IPUR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2831ZSD are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Function: Step-Down (Buck) topology
• Output Configuration: Positive Adjustable
• Number of Outputs: Single output
• Package Type: 6-pin surface mount with exposed pad
• Mounting: Surface mount compatibility

Secondary Compatibility Parameters:

• Input voltage range overlap with original specification
• Output voltage range capability to support adjustable 0.6V minimum
• Output current rating equal to or greater than 1.5A
• Operating temperature range coverage

The LM2831ZSD/NOPB represents a direct equivalent with identical electrical specifications but improved product status and compliance. The ST1S09IPUR serves as a manufacturer-recommended alternative with enhanced performance characteristics within compatible parameter ranges.

Parameter Comparison

Engineering Selection Recommendations

LM2831ZSD/NOPB (Direct Equivalent): This part is the preferred substitute for the obsolete LM2831ZSD. It maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. The packaging format differs (Tape & Reel versus bulk), but the component itself is functionally equivalent. This option is suitable for designs requiring exact parameter matching and minimal redesign effort.

ST1S09IPUR (Manufacturer-Recommended Alternative): This STMicroelectronics device provides enhanced performance characteristics including higher output current (2A versus 1.5A), wider input voltage range (2.7V to 6V), and integrated synchronous rectification for improved efficiency. The operating temperature range is narrower (-30°C to 85°C), and the minimum output voltage is higher (0.8V versus 0.6V). This part is suitable for applications where the enhanced current capability and efficiency benefits justify circuit evaluation. Both substitute options are ROHS3 compliant and carry active product status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the LM2831ZSD/NOPB be used as a direct replacement for the LM2831ZSD?

A: Yes. The LM2831ZSD/NOPB is electrically and functionally identical to the LM2831ZSD. The only difference is packaging format (Tape & Reel versus bulk). No circuit modifications are required.

Q: What are the key differences between the LM2831ZSD and ST1S09IPUR?

A: The ST1S09IPUR offers higher output current (2A versus 1.5A), wider input voltage range (2.7V to 6V versus 3V to 5.5V), and includes a synchronous rectifier for improved efficiency. However, it has a higher minimum output voltage (0.8V versus 0.6V) and a narrower operating temperature range (-30°C to 85°C versus -40°C to 125°C).

Q: Is the ST1S09IPUR compatible with designs using the LM2831ZSD?

A: Compatibility depends on specific application requirements. If the design requires 0.6V minimum output voltage or operates below -30°C or above 85°C, the ST1S09IPUR is not suitable. For applications within its operating parameters, the higher current rating and efficiency benefits may provide advantages.

Q: What is the package difference between these parts?

A: All three parts use 6-pin surface mount packages with exposed pads. The LM2831ZSD and LM2831ZSD/NOPB use 6-WDFN (3x3mm), while the ST1S09IPUR uses 6-VDFN (3x3mm). Both package types are mechanically compatible with standard 6-pin DFN footprints.

Q: Are all substitute parts RoHS compliant?

A: The LM2831ZSD is RoHS non-compliant. Both the LM2831ZSD/NOPB and ST1S09IPUR are ROHS3 compliant, meeting current environmental regulations.

Q: What is the moisture sensitivity level difference?

A: The LM2831ZSD and LM2831ZSD/NOPB have MSL 3 (168 hours), requiring controlled storage conditions. The ST1S09IPUR has MSL 1 (unlimited), offering superior moisture tolerance and simplified handling requirements.