RP115L331B-E2 Equivalent & Substitute Parts

Part Overview

The RP115L331B-E2 is a linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc., designed to deliver a fixed 3.3V output at 500mA. This positive fixed output regulator operates across an input voltage range up to 5.25V and features integrated protection against overcurrent, overtemperature, and reverse current conditions. The device is housed in an 8-XFDFN exposed pad package and is classified as an active product with RoHS compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified when alternative components meet the core functional requirements: fixed 3.3V output voltage, 500mA output current capability, positive output configuration, and surface mount packaging. Substitutes may differ in specific electrical characteristics such as dropout voltage, quiescent current, and package geometry while maintaining functional compatibility for the intended application.

Substiute Parts

RP115L331B-E2

Nisshinbo Micro Devices Inc.In Stock: 1130RP115L331B-E2 Datasheet

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LD39050PU33R

STMicroelectronicsIn Stock: 8613LD39050PU33R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RP115L331B-E2 are identified based on the following core electrical and mechanical parameters:

Primary Substitution Criteria:

• Fixed output voltage of 3.3V
• Output current rating of 500mA
• Positive output configuration
• Single regulator topology
• Surface mount packaging with exposed pad
• Active product status
• RoHS compliance

Secondary Compatibility Factors:

• Input voltage maximum rating (5.25V or higher)
• Operating temperature range overlap
• Protection feature set (overcurrent and overtemperature minimum)
• Quiescent current and dropout voltage characteristics

The LD39050PU33R from STMicroelectronics qualifies as a substitute based on matching the primary criteria. Both devices deliver 3.3V at 500mA in surface mount DFN packages with active status and environmental compliance. Differences in dropout voltage, quiescent current, and package pin count do not prevent functional substitution when application requirements permit.

Parameter Comparison

Engineering Selection Recommendations

RP115L331B-E2 (Primary Component)

The RP115L331B-E2 remains the specified component for applications requiring the lowest dropout voltage (0.085V @ 500mA) and is the active baseline for this design. This device is suitable for systems with tight input voltage margins or where power efficiency at full load is critical. The component is actively manufactured and maintains full RoHS compliance with unlimited moisture sensitivity rating.

LD39050PU33R (Substitute Component)

The LD39050PU33R from STMicroelectronics is a functional substitute when the RP115L331B-E2 is unavailable. This device meets all primary electrical requirements and extends the operating temperature maximum to 125°C, providing broader thermal operating range. The substitute exhibits lower quiescent current (50µA versus 160µA), reducing standby power consumption. The higher dropout voltage (0.4V @ 500mA) requires verification that input voltage headroom remains adequate for the application. Both devices carry active product status and environmental compliance certifications.

Substitution Feasibility:

Substitution is permissible when:

• Input voltage remains above 3.385V (3.3V output + 0.085V dropout minimum)
• PCB layout accommodates the 6-DFN (3x3) package geometry of the substitute
• Application does not require reverse current protection as a primary design criterion
• Thermal environment does not exceed 85°C, or the extended 125°C rating of the substitute is acceptable

Frequently Asked Questions (FAQ)

Q: Can the LD39050PU33R directly replace the RP115L331B-E2 on the same PCB?

A: Direct PCB replacement is not possible without layout modification. The RP115L331B-E2 uses an 8-XFDFN package, while the LD39050PU33R uses a 6-DFN (3x3) package. Pin counts and footprints differ. A new PCB layout is required for the substitute component.

Q: What is the impact of the higher dropout voltage in the LD39050PU33R?

A: The LD39050PU33R exhibits 0.4V dropout at 500mA compared to 0.085V for the RP115L331B-E2. This means the input voltage must be at least 3.7V to maintain 3.3V output at full load with the substitute. Applications with input voltages between 3.385V and 3.7V cannot use the substitute without output voltage degradation.

Q: Are both devices RoHS compliant?

A: Yes. The RP115L331B-E2 is RoHS Compliant. The LD39050PU33R is ROHS3 Compliant. Both meet RoHS requirements and are suitable for applications with environmental compliance mandates.

Q: What is the difference in quiescent current between these devices?

A: The RP115L331B-E2 draws 160µA quiescent current, while the LD39050PU33R draws 50µA. In battery-powered or low-power standby applications, the substitute reduces standby power consumption by 110µA.

Q: Does the LD39050PU33R include reverse current protection?

A: No. The LD39050PU33R protection features include overcurrent, overtemperature, and short circuit protection. The RP115L331B-E2 includes reverse current protection. Applications requiring reverse current blocking must use the primary component.

Q: What is the operating temperature difference?

A: The RP115L331B-E2 operates from -40°C to 85°C. The LD39050PU33R operates from -40°C to 125°C. The substitute supports higher temperature environments and is suitable for applications requiring extended thermal range.

Q: Are both devices available in tape and reel packaging?

A: The RP115L331B-E2 is supplied in Tape & Reel (TR) packaging. The LD39050PU33R is supplied in Cut Tape (CT) and Digi-Reel® packaging. Packaging format differs between the two devices.