LM2832XSDX Equivalent & Substitute Parts

Part Overview

The LM2832XSDX is a buck switching regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 2A output current with a 1.6MHz switching frequency in a 6-WDFN exposed pad package. The device operates across an input voltage range of 3V to 5.5V with adjustable output from 0.6V to 4.5V, making it suitable for step-down power management applications requiring compact form factors.

The LM2832XSDX is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications currently utilizing this component.

Substiute Parts

LM2832XSDX

Texas InstrumentsIn Stock: 927LM2832XSDX Datasheet

Current PartRFQ

ST1S09IPUR

STMicroelectronicsIn Stock: 6799ST1S09IPUR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The ST1S09IPUR from STMicroelectronics qualifies as a functional substitute for the LM2832XSDX based on the following core electrical and mechanical compatibility criteria:

Matching Parameters:

• Function: Both are step-down (buck) switching regulators
• Output Configuration: Both provide positive adjustable output
• Number of Outputs: Both have 1 output
• Current Rating: Both deliver 2A output current
• Topology: Both employ buck topology
• Mounting Type: Both are surface mount devices
• Package Form Factor: Both use 6-pin DFN packages with exposed pads (6-WDFN vs. 6-VDFN)

Allowable Parameter Variations:

• Input Voltage Range: ST1S09IPUR (2.7V to 6V) encompasses the LM2832XSDX range (3V to 5.5V)
• Output Voltage Range: ST1S09IPUR (0.8V to 5.22V) covers the LM2832XSDX range (0.6V to 4.5V) for most applications
• Switching Frequency: ST1S09IPUR operates at 1.5MHz versus 1.6MHz (within acceptable tolerance for buck regulator operation)
• Operating Temperature: ST1S09IPUR (-30°C to 85°C) represents a narrower range than LM2832XSDX (-40°C to 125°C); applications requiring extended temperature operation must verify compatibility

Parameter Comparison

Engineering Selection Recommendations

The ST1S09IPUR is the manufacturer-recommended substitute for the obsolete LM2832XSDX. Selection of this substitute is justified on the following engineering grounds:

Product Status & Supply Continuity: The LM2832XSDX is obsolete with no ongoing manufacturer support. The ST1S09IPUR is actively produced and supported by STMicroelectronics, ensuring long-term availability and supply chain stability.

Compliance & Certifications: The ST1S09IPUR meets ROHS3 compliance requirements, whereas the LM2832XSDX is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, the ST1S09IPUR satisfies current environmental and material restrictions.

Moisture Sensitivity: The ST1S09IPUR carries MSL 1 (unlimited moisture sensitivity level) compared to the LM2832XSDX MSL 3 (168 hours). This provides superior handling flexibility and reduced risk during storage and assembly processes.

Electrical Compatibility: Both devices operate as 2A buck regulators with adjustable positive output. The ST1S09IPUR input voltage range (2.7V to 6V) encompasses the LM2832XSDX operating window (3V to 5.5V). The output voltage minimum of 0.8V on the ST1S09IPUR is 0.2V higher than the LM2832XSDX; applications requiring output below 0.8V must verify alternative solutions.

Package Compatibility: Both devices use 6-pin DFN packages with 3x3mm footprints and exposed pads. PCB layout and thermal management considerations remain consistent between the two parts.

Temperature Range Consideration: The ST1S09IPUR operating temperature range (-30°C to 85°C) is narrower than the LM2832XSDX (-40°C to 125°C). Applications requiring operation below -30°C or above 85°C must confirm the ST1S09IPUR meets thermal specifications before substitution.

Frequently Asked Questions (FAQ)

Q: Can the ST1S09IPUR directly replace the LM2832XSDX without PCB modifications?

A: The ST1S09IPUR and LM2832XSDX share identical 6-pin DFN 3x3mm package footprints with exposed pads. Pin-to-pin compatibility and thermal pad placement are equivalent, allowing direct PCB substitution without layout changes. However, external component values (feedback resistors, capacitors) may require adjustment based on the specific output voltage and frequency requirements of your application.

Q: What is the significance of the synchronous rectifier difference?

A: The LM2832XSDX uses asynchronous rectification (internal diode), while the ST1S09IPUR includes a synchronous rectifier (integrated MOSFET). Synchronous rectification reduces conduction losses and improves efficiency, particularly at lower output voltages and higher load currents. This is a functional improvement that does not affect substitution compatibility.

Q: Why is the minimum output voltage different between the two parts?

A: The LM2832XSDX supports output voltages as low as 0.6V, while the ST1S09IPUR minimum is 0.8V. If your application requires output below 0.8V, the ST1S09IPUR cannot be used as a direct substitute. Verify your actual output voltage requirement before proceeding with substitution.

Q: Does the 100kHz switching frequency difference affect circuit performance?

A: The LM2832XSDX operates at 1.6MHz while the ST1S09IPUR operates at 1.5MHz. This 100kHz difference (approximately 6% variation) is within normal tolerance for buck regulator design. Output filter component values may require minor recalculation to maintain equivalent ripple voltage and transient response characteristics.

Q: Is the narrower operating temperature range of the ST1S09IPUR a concern?

A: The ST1S09IPUR operates from -30°C to 85°C, compared to the LM2832XSDX range of -40°C to 125°C. If your application operates within the ST1S09IPUR range, no concern exists. Applications requiring operation below -30°C or above 85°C must verify the ST1S09IPUR meets thermal specifications or identify alternative solutions.

Q: What are the RoHS compliance implications?

A: The LM2832XSDX is RoHS non-compliant, while the ST1S09IPUR is ROHS3 compliant. If your application, customer, or regulatory environment requires RoHS compliance, the ST1S09IPUR satisfies these requirements. The LM2832XSDX cannot be used in RoHS-restricted applications.

Q: Are there any moisture sensitivity considerations during assembly?

A: The ST1S09IPUR carries MSL 1 (unlimited), meaning it has no moisture sensitivity restrictions. The LM2832XSDX carries MSL 3 (168 hours), requiring controlled storage and handling. The ST1S09IPUR provides superior flexibility for inventory management and assembly scheduling.