LM2830ZSDX Equivalent & Substitute Parts

Part Overview

The LM2830ZSDX is a buck switching regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 1A output current with an input voltage range of 3V to 5.5V and adjustable output from 0.6V to 4.5V. The device operates at a 3MHz switching frequency and is housed in a 6-WDFN exposed pad package suitable for surface mount applications.

This part is currently marked as obsolete, making identification of compatible substitute components essential for ongoing design support and production continuity. The LM2830ZSDX remains available with 750 pieces in stock as new original inventory.

Substiute Parts

LM2830ZSDX

Texas InstrumentsIn Stock: 860LM2830ZSDX Datasheet

Current PartRFQ

ST1S09IPUR

STMicroelectronicsIn Stock: 6799ST1S09IPUR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2830ZSDX is based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Function: Step-down (buck) topology with positive adjustable output
• Output voltage adjustment range must encompass or exceed 0.6V minimum
• Output current capability must meet or exceed 1A
• Input voltage range must accommodate 3V to 5.5V operation
• Switching frequency and synchronous rectifier presence do not restrict substitution but affect performance characteristics

Mechanical Compatibility Criteria:

• Surface mount package type (6-pin DFN/WDFN variants acceptable)
• Exposed pad thermal design
• Package footprint compatibility with 3x3mm form factor

The ST1S09IPUR from STMicroelectronics meets these substitution criteria. It provides higher output current capability (2A versus 1A), wider input voltage range (2.7V to 6V), and includes a synchronous rectifier for improved efficiency. The part is active in production status with full RoHS3 compliance and superior moisture sensitivity rating (MSL 1).

Parameter Comparison

Engineering Selection Recommendations

The ST1S09IPUR is a direct functional substitute for the LM2830ZSDX based on electrical topology and output adjustment capability. Key selection factors include:

Product Status: The LM2830ZSDX is obsolete, while the ST1S09IPUR is active in production. This ensures long-term availability and supply chain stability for new designs or production continuation.

Regulatory Compliance: The ST1S09IPUR holds RoHS3 compliance status, meeting current environmental and regulatory requirements. The LM2830ZSDX is RoHS non-compliant, which may restrict use in regulated applications or regions with RoHS mandates.

Reliability and Handling: The ST1S09IPUR features MSL 1 rating (unlimited moisture exposure), compared to MSL 3 for the LM2830ZSDX. This reduces moisture-related failures during storage, handling, and assembly processes.

Performance Enhancements: The ST1S09IPUR includes a synchronous rectifier, improving efficiency over the non-synchronous LM2830ZSDX design. Output current capability is doubled (2A versus 1A), providing design margin for current-limited applications.

Temperature Operating Range: The LM2830ZSDX supports -40°C to 125°C operation, while the ST1S09IPUR operates from -30°C to 85°C. Applications requiring extended low-temperature operation below -30°C must retain the original part or identify alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can the ST1S09IPUR directly replace the LM2830ZSDX without circuit modifications?

A: The ST1S09IPUR is electrically compatible for buck regulator applications with adjustable positive output. Both devices use similar feedback network topologies for output voltage adjustment. However, the minimum output voltage differs (0.8V versus 0.6V), which may affect designs requiring sub-0.8V output levels. Package footprints differ (6-VDFN versus 6-WDFN), requiring PCB layout verification. Switching frequency differs (1.5MHz versus 3MHz), affecting inductor and capacitor selection. A complete circuit review is necessary before implementation.

Q: What are the key electrical differences between these parts?

A: The ST1S09IPUR provides higher output current (2A versus 1A), wider input voltage range (2.7V to 6V versus 3V to 5.5V), and includes synchronous rectification for improved efficiency. The LM2830ZSDX operates at higher switching frequency (3MHz versus 1.5MHz) and supports lower minimum output voltage (0.6V versus 0.8V). The ST1S09IPUR has a narrower operating temperature range (-30°C to 85°C versus -40°C to 125°C).

Q: Are the package footprints compatible?

A: Both parts use 6-pin DFN packages with exposed pads in 3x3mm form factors. The LM2830ZSDX uses 6-WDFN while the ST1S09IPUR uses 6-VDFN. Pin assignments and pad layouts may differ. PCB footprint verification against manufacturer datasheets is required before board redesign.

Q: What is the impact of the different switching frequencies?

A: The LM2830ZSDX operates at 3MHz while the ST1S09IPUR operates at 1.5MHz. Higher switching frequency reduces inductor and capacitor sizes but increases switching losses. Lower frequency reduces losses but requires larger passive components. Output ripple voltage and noise characteristics will differ. Filter design and EMI performance must be re-evaluated for the substitute part.

Q: Does the synchronous rectifier in the ST1S09IPUR affect circuit design?

A: The ST1S09IPUR includes an integrated synchronous rectifier, replacing the external diode function in non-synchronous designs. This improves efficiency and reduces heat dissipation. Circuit topology remains compatible, but efficiency performance will be superior. No additional design changes are required for this feature.

Q: What compliance considerations apply to substitution?

A: The ST1S09IPUR is RoHS3 compliant while the LM2830ZSDX is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, the ST1S09IPUR is the appropriate choice. The ST1S09IPUR also features superior moisture sensitivity (MSL 1 versus MSL 3), reducing handling and storage risks.

Q: Are there temperature range limitations for the ST1S09IPUR?

A: The ST1S09IPUR operates from -30°C to 85°C, compared to -40°C to 125°C for the LM2830ZSDX. Applications requiring operation below -30°C or above 85°C cannot use the ST1S09IPUR as a substitute. Alternative parts with extended temperature ranges must be identified for such applications.