LP8345CLDX-3.3/NOPB Equivalent & Substitute Parts

Part Overview

The LP8345CLDX-3.3/NOPB is a linear voltage regulator IC from Texas Instruments designed to deliver a fixed 3.3V output at 500mA. This positive fixed output regulator operates with a maximum input voltage of 10V and features integrated over-current and over-temperature protection. The device is packaged in a 6-WSON (2.92x3.29mm) format with an exposed pad for enhanced thermal performance.

The LP8345CLDX-3.3/NOPB has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this regulator.

Substiute Parts

LP8345CLDX-3.3/NOPB

Texas InstrumentsIn Stock: 931LP8345CLDX-3.3/NOPB Datasheet

Current PartRFQ

REG103GA-3.3

Texas InstrumentsIn Stock: 1754REG103GA-3.3 Datasheet

MFR RecommendedRFQ

LD39050PU33R

STMicroelectronicsIn Stock: 8613LD39050PU33R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP8345CLDX-3.3/NOPB are selected based on the following critical parameters that determine functional equivalence:

• Fixed output voltage of 3.3V
• Output current capability of 500mA minimum
• Positive output configuration with single regulator
• Surface mount packaging with thermal management capability
• Over-current and over-temperature protection
• ROHS3 compliance and EAR99 classification

The two identified substitutes meet these core requirements while offering variations in input voltage rating, dropout voltage, quiescent current, and package form factor. These variations allow for design flexibility depending on specific application constraints.

Parameter Comparison

Engineering Selection Recommendations

REG103GA-3.3 (Texas Instruments, Last Time Buy): This substitute offers superior dropout voltage performance (0.28V vs 0.5V) and higher input voltage tolerance (15V vs 10V), making it suitable for applications with wider input supply ranges. The SOT-223-6 package provides larger lead spacing compared to the original WSON package. Higher quiescent current (0.7mA vs 50µA) may impact low-power applications. Operating temperature range is limited to -40°C ~ 85°C, which is narrower than the original part. This part includes an Enable control feature not present in the LP8345CLDX-3.3/NOPB.

LD39050PU33R (STMicroelectronics, Active): This substitute maintains the same quiescent current specification (50µA) and extends the operating temperature range to -40°C ~ 125°C, matching the upper limit of the original part. Input voltage is limited to 5.5V, which is lower than the original 10V specification. The 6-VDFN package (3x3mm) is similar in form factor to the original WSON package. This part includes additional protection features (short circuit protection) and control features (Power Good output) not present in the LP8345CLDX-3.3/NOPB. Active product status ensures ongoing availability and support.

Frequently Asked Questions (FAQ)

Q: Can REG103GA-3.3 be used as a direct replacement for LP8345CLDX-3.3/NOPB?

A: REG103GA-3.3 is functionally equivalent for 3.3V, 500mA applications. The primary differences are package type (SOT-223-6 vs 6-WSON), operating temperature range (-40°C ~ 85°C vs 0°C ~ 125°C), and the addition of an Enable control pin. PCB layout modifications are required due to different package pinouts and dimensions.

Q: What are the input voltage constraints when selecting a substitute?

A: The LP8345CLDX-3.3/NOPB accepts input voltages up to 10V. REG103GA-3.3 tolerates up to 15V, while LD39050PU33R is limited to 5.5V. Application input supply specifications must be verified against the selected substitute's maximum input voltage rating.

Q: How do dropout voltage differences affect substitute selection?

A: Dropout voltage determines the minimum input-to-output voltage differential required for proper regulation. The LP8345CLDX-3.3/NOPB requires 0.5V dropout at 500mA. REG103GA-3.3 (0.28V) and LD39050PU33R (0.4V) offer lower dropout, allowing operation with lower input supply voltages. Applications with tight input supply margins benefit from lower dropout specifications.

Q: Are package changes acceptable in production designs?

A: Package changes require PCB redesign, including footprint modifications, trace routing adjustments, and thermal management evaluation. REG103GA-3.3 uses SOT-223-6 with larger lead spacing, while LD39050PU33R uses 6-VDFN similar in size to the original WSON package. Thermal performance and board space availability must be reassessed for each package type.

Q: What is the significance of product status (Obsolete, Last Time Buy, Active)?

A: Obsolete status indicates the LP8345CLDX-3.3/NOPB is no longer manufactured. Last Time Buy status for REG103GA-3.3 indicates limited future availability. Active status for LD39050PU33R ensures continued manufacturing and long-term supply chain support.

Q: Do the substitutes provide equivalent protection features?

A: All three parts include over-current and over-temperature protection. LD39050PU33R adds short-circuit protection not present in the original part. REG103GA-3.3 and LD39050PU33R include control features (Enable and Power Good outputs) that provide additional circuit management capabilities beyond the original LP8345CLDX-3.3/NOPB.