RP112K281B-TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RP112K281B-TR is an active linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc. in the Power Management (PMIC) category. This device functions as a positive fixed output voltage regulator delivering 2.8V at 150mA output current in a compact 4-UDFN surface mount package. The part is supplied in Tape & Reel packaging and maintains RoHS compliance with MSL Level 1 rating.

Equivalent and substitute parts are identified to support design flexibility, inventory optimization, and supply chain continuity. Substitute parts maintain functional equivalence through matching electrical specifications and mechanical compatibility while potentially offering variations in performance characteristics such as quiescent current and dropout voltage.

Substiute Parts

RP112K281B-TR

Nisshinbo Micro Devices Inc.In Stock: 974RP112K281B-TR Datasheet

Current PartRFQ

RP109L281D-TR

Nisshinbo Micro Devices Inc.In Stock: 95283RP109L281D-TR Datasheet

Parametric EquivalentRFQ

RP112K281D-TR

Nisshinbo Micro Devices Inc.In Stock: 17118RP112K281D-TR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RP112K281B-TR are identified based on strict parametric equivalence in the following critical specifications:

Core Matching Parameters:

• Output voltage: 2.8V fixed
• Output current capability: 150mA
• Maximum input voltage: 5.25V
• Package type: 4-UDFN Exposed Pad (DFN(PL)1010-4)
• Mounting type: Surface Mount
• Operating temperature range: -40°C ~ 85°C
• Output configuration: Positive fixed output
• Control features: Enable function
• Protection features: Over Current protection
• RoHS compliance and MSL Level 1 rating

Allowed Variation Parameters: Substitute parts may differ in the following characteristics while maintaining functional compatibility:

• Dropout voltage (0.28V to 0.35V @ 150mA)
• Quiescent current (70 µA to 100 µA)
• PSRR performance (75dB to 80dB ~ 65dB across frequency range)
• Packaging format (Tape & Reel maintained)
• Series designation (RP109x or RP112x)

Parameter Comparison

Engineering Selection Recommendations

RP112K281D-TR is a direct parametric equivalent to the RP112K281B-TR. Both parts share identical electrical specifications including dropout voltage (0.28V @ 150mA), quiescent current (100 µA), and PSRR performance (80dB ~ 65dB across 1kHz ~ 100kHz). The primary distinction is the packaging format designation (D-TR versus B-TR). Both maintain active product status, RoHS compliance, and MSL Level 1 rating. This part is suitable for direct substitution in applications where the RP112K281B-TR is specified.

RP109L281D-TR is a parametric equivalent with acceptable performance variations. This part maintains the same output voltage (2.8V), output current (150mA), input voltage rating (5.25V), and package type (4-UDFN Exposed Pad). The RP109L281D-TR exhibits a higher dropout voltage (0.35V @ 150mA versus 0.28V) and lower quiescent current (70 µA versus 100 µA). The PSRR specification is reduced to 75dB at 1kHz. This part is suitable for applications where the lower quiescent current provides system-level benefits and the higher dropout voltage remains within design margins. The RP109L281D-TR operates within the same temperature range and maintains equivalent compliance certifications.

All three parts are active products from Nisshinbo Micro Devices Inc., ensuring ongoing availability and support. Selection between these equivalents depends on specific application requirements regarding dropout voltage performance, quiescent current consumption, and noise rejection characteristics.

Frequently Asked Questions (FAQ)

Q: Can RP112K281D-TR be used as a direct replacement for RP112K281B-TR?

A: Yes. The RP112K281D-TR is a direct parametric equivalent. Both parts deliver identical output voltage (2.8V), output current (150mA), dropout voltage (0.28V @ 150mA), quiescent current (100 µA), and PSRR performance. The packaging format designation differs (D-TR versus B-TR), but both use the same 4-UDFN Exposed Pad package type (DFN(PL)1010-4) with identical pin configurations and mounting requirements.

Q: What are the key differences between RP109L281D-TR and RP112K281B-TR?

A: The RP109L281D-TR differs in three performance characteristics: dropout voltage is 0.35V @ 150mA (versus 0.28V), quiescent current is 70 µA (versus 100 µA), and PSRR is 75dB at 1kHz (versus 80dB ~ 65dB across 1kHz ~ 100kHz). All other specifications including output voltage, output current, input voltage rating, package type, and operating temperature range are identical.

Q: Are all three parts compatible with the same PCB layout?

A: Yes. All three parts use the 4-UDFN Exposed Pad package (DFN(PL)1010-4) with identical physical dimensions and pin assignments. PCB layouts designed for the RP112K281B-TR accommodate the RP112K281D-TR and RP109L281D-TR without modification.

Q: Which substitute part should be selected for low-power applications?

A: The RP109L281D-TR is suitable for applications prioritizing low quiescent current consumption. This part draws 70 µA compared to 100 µA for the RP112K281B-TR and RP112K281D-TR. The selection depends on whether the higher dropout voltage (0.35V versus 0.28V) remains acceptable within the application's input and output voltage margins.

Q: Do all substitute parts maintain the same compliance certifications?

A: Yes. All three parts are RoHS compliant with MSL Level 1 rating (Unlimited moisture sensitivity). All parts carry ECCN EAR99 and HTSUS 8542.39.0001 classifications. Operating temperature range is -40°C ~ 85°C for all parts.

Q: What is the significance of the packaging format designation (B-TR versus D-TR)?

A: The B-TR and D-TR designations indicate different packaging format specifications within the Tape & Reel delivery method. Both formats use identical 4-UDFN Exposed Pad packages with the same physical and electrical characteristics. The designation reflects manufacturing or distribution specifications rather than functional differences.

Q: Can RP109L281D-TR be used in applications requiring the lowest dropout voltage?

A: No. The RP109L281D-TR has a maximum dropout voltage of 0.35V @ 150mA, which is higher than the RP112K281B-TR and RP112K281D-TR (both 0.28V @ 150mA). Applications requiring the lowest dropout voltage should use RP112K281B-TR or RP112K281D-TR.

Q: Are there inventory considerations when selecting between these parts?

A: Inventory levels differ among the three parts. Availability should be confirmed with the supplier for the specific part number required. All three parts are listed as active products with current stock.