LM2832ZSD Equivalent & Substitute Parts

Part Overview

The LM2832ZSD is a buck switching regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 2A output current with a 3MHz switching frequency in a 6-WDFN exposed pad package. The device is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing production and design requirements. Alternative parts must maintain compatibility across input voltage range, output voltage adjustability, current capacity, and thermal operating specifications.

Substiute Parts

LM2832ZSD

Texas InstrumentsIn Stock: 953LM2832ZSD Datasheet

Current PartRFQ

LM2832ZSD/NOPB

Texas InstrumentsIn Stock: 4310LM2832ZSD/NOPB Datasheet

DirectRFQ

ST1S09IPUR

STMicroelectronicsIn Stock: 6799ST1S09IPUR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2832ZSD are evaluated based on the following critical parameters that determine functional compatibility:

Electrical Compatibility Criteria:

• Function: Step-Down (Buck) topology
• Output Configuration: Positive adjustable output
• Number of Outputs: Single output
• Current - Output: 2A minimum
• Voltage - Input Range: Must accommodate 3V to 5.5V input
• Voltage - Output Range: Must support 0.6V to 4.5V adjustable output
• Switching Frequency: 3MHz nominal operation

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount
• Package Type: 6-pin DFN/WDFN with exposed pad (3x3mm footprint)

Compliance Criteria:

• RoHS Status: Preferred ROHS3 compliant for new designs
• Moisture Sensitivity Level: MSL 3 or better
• REACH Status: REACH Unaffected

Two substitute parts meet these criteria: LM2832ZSD/NOPB (direct equivalent) and ST1S09IPUR (functional alternative).

Parameter Comparison

Engineering Selection Recommendations

LM2832ZSD/NOPB (Direct Equivalent - Preferred)

The LM2832ZSD/NOPB is the direct equivalent of the obsolete LM2832ZSD. It maintains identical electrical specifications including input voltage range (3V to 5.5V), output voltage adjustability (0.6V to 4.5V), 2A output current, and 3MHz switching frequency. The primary advantage is that it is currently in active production status with 4200 units in stock. The LM2832ZSD/NOPB is ROHS3 compliant, addressing regulatory requirements that the original part does not meet. Packaging is identical (6-WSON 3x3mm). This part is the recommended choice for direct replacement in existing designs.

ST1S09IPUR (Functional Alternative)

The ST1S09IPUR from STMicroelectronics is a functional alternative that meets the core buck regulator requirements. It operates within the specified input voltage range (2.7V to 6V, which encompasses the 3V to 5.5V requirement) and delivers 2A output current with adjustable output voltage (0.8V to 5.22V, which encompasses the 0.6V to 4.5V requirement). The ST1S09IPUR includes a synchronous rectifier, which the LM2832ZSD does not have, potentially offering improved efficiency. The switching frequency is 1.5MHz, lower than the 3MHz of the LM2832ZSD. The operating temperature range is -30°C to 85°C, which is narrower than the -40°C to 125°C of the original part. The package is 6-VDFN (3x3mm), which is mechanically compatible with the 6-WDFN footprint. The ST1S09IPUR is ROHS3 compliant and has superior moisture sensitivity (MSL 1). This part is suitable for applications where the lower switching frequency and narrower temperature range are acceptable, and where the synchronous rectifier benefit is desired.

Frequently Asked Questions (FAQ)

Q: Can I use LM2832ZSD/NOPB as a direct replacement for LM2832ZSD?

A: Yes. The LM2832ZSD/NOPB is the active production equivalent of the obsolete LM2832ZSD. All electrical and mechanical specifications are identical. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No design changes are required.

Q: What are the key differences between LM2832ZSD/NOPB and ST1S09IPUR?

A: Both are 2A buck regulators in 6-pin DFN packages. LM2832ZSD/NOPB maintains the exact input/output voltage ranges and 3MHz switching frequency of the original LM2832ZSD. ST1S09IPUR has a wider input range (2.7V to 6V vs. 3V to 5.5V), higher maximum output voltage (5.22V vs. 4.5V), lower switching frequency (1.5MHz vs. 3MHz), includes a synchronous rectifier, and has a narrower operating temperature range (-30°C to 85°C vs. -40°C to 125°C). The ST1S09IPUR is suitable when these parameter differences are acceptable.

Q: Are the packages physically compatible?

A: The LM2832ZSD/NOPB uses a 6-WSON (3x3mm) package, and the ST1S09IPUR uses a 6-VDFN (3x3mm) package. Both are 6-pin DFN variants with exposed pads and identical 3x3mm footprints. They are mechanically interchangeable on the PCB. However, pin assignments and internal die characteristics differ, so schematic and layout verification is required before substitution.

Q: Which substitute part should I choose for a new design?

A: For new designs, LM2832ZSD/NOPB is recommended as the primary choice because it is the direct equivalent with identical specifications and active production status. ST1S09IPUR is a valid alternative if the application can accommodate its lower switching frequency (1.5MHz), narrower temperature range (-30°C to 85°C), and higher minimum output voltage (0.8V vs. 0.6V).

Q: Are both substitute parts RoHS compliant?

A: Yes. Both LM2832ZSD/NOPB and ST1S09IPUR are ROHS3 compliant. The original LM2832ZSD is RoHS non-compliant, making either substitute necessary for applications with RoHS requirements.

Q: What is the moisture sensitivity difference between these parts?

A: LM2832ZSD and LM2832ZSD/NOPB both have MSL 3 (168 hours). ST1S09IPUR has MSL 1 (unlimited), indicating superior moisture resistance and lower risk during storage and handling.