RP112K181B-TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RP112K181B-TR is an active linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc. This positive fixed output regulator delivers 150mA at 1.8V and is housed in a 4-UDFN Exposed Pad surface mount package. The device includes enable control and over-current protection features, operating across the industrial temperature range of -40°C to 85°C.

Substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or manufacturing transitions while maintaining identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer	Nisshinbo Micro Devices Inc.
Category	Power Management (PMIC)
Series	RP112x
Output Voltage (Fixed)	1.8V
Output Current	150mA
Input Voltage (Max)	5.25V
Dropout Voltage (Max)	0.41V @ 150mA
Quiescent Current	100 µA
PSRR	80dB ~ 65dB (1kHz ~ 100kHz)
Package Type	4-UDFN Exposed Pad (DFN(PL)1010-4)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Control Features	Enable
Protection Features	Over Current
RoHS Status	RoHS Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the RP112K181B-TR are identified based on strict parametric equivalence within the RP112x series. The substitution criteria are defined by the following key parameters:

Electrical Specifications: Output voltage (1.8V fixed), output current capability (150mA), input voltage maximum (5.25V), dropout voltage (0.41V @ 150mA), quiescent current (100 µA), and PSRR performance (80dB ~ 65dB across 1kHz ~ 100kHz range).

Functional Features: Enable control capability and over-current protection.

Physical & Environmental Specifications: 4-UDFN Exposed Pad package (DFN(PL)1010-4), surface mount technology, operating temperature range (-40°C ~ 85°C), RoHS compliance, and MSL rating (1).

Parts meeting all these criteria are classified as parametric equivalents and direct substitutes. Variations in packaging format (Tape & Reel designation) do not affect electrical or mechanical compatibility.

Parameter Comparison

Parameter	RP112K181B-TR	RP112K181D-TR	Match Status
Manufacturer	Nisshinbo Micro Devices Inc.	Nisshinbo Micro Devices Inc.	Identical
Series	RP112x	RP112x	Identical
Output Voltage (Fixed)	1.8V	1.8V	Identical
Output Current	150mA	150mA	Identical
Input Voltage (Max)	5.25V	5.25V	Identical
Dropout Voltage (Max)	0.41V @ 150mA	0.41V @ 150mA	Identical
Quiescent Current	100 µA	100 µA	Identical
PSRR	80dB ~ 65dB (1kHz ~ 100kHz)	80dB ~ 65dB (1kHz ~ 100kHz)	Identical
Package Type	4-UDFN Exposed Pad (DFN(PL)1010-4)	4-UDFN Exposed Pad (DFN(PL)1010-4)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Identical
Control Features	Enable	Enable	Identical
Protection Features	Over Current	Over Current	Identical
RoHS Status	RoHS Compliant	RoHS Compliant	Identical
MSL Rating	1 (Unlimited)	1 (Unlimited)	Identical
Product Status	Active	Active	Identical

Engineering Selection Recommendations

Both RP112K181B-TR and RP112K181D-TR are active products from Nisshinbo Micro Devices Inc. with identical electrical, mechanical, and environmental specifications. Selection between these parts is based on availability and supply chain requirements rather than technical differentiation.

The RP112K181D-TR variant currently maintains higher inventory levels (31,822 pieces) compared to the RP112K181B-TR (947 pieces), making it suitable for high-volume production requirements or extended lead-time mitigation strategies.

Both parts carry RoHS compliance certification and MSL rating 1 (unlimited moisture sensitivity), confirming suitability for standard surface mount assembly processes without additional moisture control measures.

Frequently Asked Questions (FAQ)

Q: Are RP112K181B-TR and RP112K181D-TR electrically interchangeable?

A: Yes. Both parts are parametric equivalents with identical output voltage (1.8V), output current (150mA), dropout voltage (0.41V @ 150mA), quiescent current (100 µA), PSRR performance, and all control and protection features.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. Both parts use the identical 4-UDFN Exposed Pad (DFN(PL)1010-4) package with surface mount technology, requiring no PCB layout modifications or requalification.

Q: What is the difference between the B and D variants?

A: The B and D designations represent different manufacturing batches or tape reel configurations within the same product line. No electrical or mechanical differences exist between these variants.

Q: Are both parts RoHS compliant?

A: Yes. Both RP112K181B-TR and RP112K181D-TR are RoHS compliant with MSL rating 1 (unlimited), suitable for standard surface mount assembly without special moisture handling requirements.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -40°C to 85°C (TA), covering industrial temperature specifications.

Q: Can either part be used in applications requiring enable/disable functionality?

A: Yes. Both parts include enable control features, allowing dynamic output control in circuit designs.

Q: What protection features are included in both parts?

A: Both RP112K181B-TR and RP112K181D-TR include over-current protection, safeguarding against excessive load conditions.

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