RP112K331B-TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RP112K331B-TR is an active linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc., classified as a Power Management (PMIC) component. This device functions as a positive fixed output voltage regulator delivering 3.3V 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 1 moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching electrical specifications including output voltage, output current capacity, dropout voltage characteristics, quiescent current performance, and identical package geometry. Substitute parts within this reference maintain functional equivalence for direct circuit board replacement applications.

Key Parameters

Parameter	Value
Manufacturer	Nisshinbo Micro Devices Inc.
Category	Power Management (PMIC)
Output Voltage (Fixed)	3.3V
Output Current	150mA
Maximum Input Voltage	5.25V
Dropout Voltage (Max)	0.28V @ 150mA
Quiescent Current	100 µA
Package Type	4-UDFN Exposed Pad (DFN(PL)1010-4)
Mounting Type	Surface Mount
Operating Temperature Range	-40°C ~ 85°C
Control Features	Enable
Protection Features	Over Current
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the RP112K331B-TR are identified through parametric equivalence across the following critical specifications:

Electrical Equivalence Criteria:

Output voltage: 3.3V fixed
Output current capacity: 150mA
Maximum input voltage: 5.25V
Package configuration: 4-UDFN Exposed Pad (DFN(PL)1010-4)
Control features: Enable function
Protection features: Over Current protection
Operating temperature range: -40°C ~ 85°C

Acceptable Variation Parameters:

Dropout voltage: Ranges from 0.28V to 0.35V @ 150mA
Quiescent current: Ranges from 2 µA to 100 µA
PSRR (Power Supply Rejection Ratio): Specified or unspecified

All substitute parts maintain identical package geometry, mounting type, and core functional specifications. Variations in dropout voltage and quiescent current do not affect circuit-level compatibility for standard applications within the specified operating conditions.

Parameter Comparison

Parameter	RP112K331B-TR	RP109L331D-TR	RP110L331D-TR	RP112K331D-TR
Manufacturer	Nisshinbo Micro Devices Inc.	Nisshinbo Micro Devices Inc.	Nisshinbo Micro Devices Inc.	Nisshinbo Micro Devices Inc.
Series	RP112x	RP109x	RP110x	RP112x
Output Voltage (Fixed)	3.3V	3.3V	3.3V	3.3V
Output Current	150mA	150mA	150mA	150mA
Maximum Input Voltage	5.25V	5.25V	5.25V	5.25V
Dropout Voltage (Max)	0.28V @ 150mA	0.32V @ 150mA	0.35V @ 150mA	0.28V @ 150mA
Quiescent Current	100 µA	70 µA	2 µA	100 µA
PSRR	80dB ~ 65dB (1kHz ~ 100kHz)	75dB (1kHz)	Not Specified	80dB ~ 65dB (1kHz ~ 100kHz)
Package Type	4-UDFN Exposed Pad	4-UDFN Exposed Pad	4-UDFN Exposed Pad	4-UDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Control Features	Enable	Enable	Enable	Enable
Protection Features	Over Current	Over Current	Over Current	Over Current
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

RP112K331D-TR represents the closest functional equivalent to RP112K331B-TR, sharing identical electrical specifications including 0.28V dropout voltage and 100 µA quiescent current. Both devices belong to the RP112x series and deliver matching PSRR performance. The primary distinction is packaging format (Tape & Reel designation) and RoHS3 compliance status of the substitute. This part is suitable for direct replacement in applications requiring equivalent performance characteristics.

RP109L331D-TR provides functional equivalence with reduced quiescent current (70 µA) and slightly elevated dropout voltage (0.32V @ 150mA). This RP109x series device maintains all critical electrical parameters and package specifications. Selection of this part is appropriate for applications where lower quiescent current consumption provides system-level benefits.

RP110L331D-TR offers the lowest quiescent current specification (2 µA) among available substitutes, with maximum dropout voltage of 0.35V @ 150mA. This RP110x series device is suitable for battery-powered or ultra-low-power applications where quiescent current minimization is a design priority. PSRR specification is not provided for this variant.

All substitute parts maintain active product status, identical package geometry (4-UDFN Exposed Pad), surface mount configuration, and MSL 1 moisture sensitivity rating. Selection between substitutes depends on specific application requirements regarding dropout voltage performance, quiescent current characteristics, and PSRR specifications.

Frequently Asked Questions (FAQ)

Q: Can RP109L331D-TR be used as a direct replacement for RP112K331B-TR?

A: Yes. Both devices deliver 3.3V fixed output at 150mA with identical package geometry (4-UDFN Exposed Pad) and mounting type. The RP109L331D-TR exhibits slightly higher dropout voltage (0.32V versus 0.28V) and lower quiescent current (70 µA versus 100 µA). These differences do not affect circuit-level compatibility for standard linear regulator applications within the specified operating temperature range.

Q: What is the primary difference between RP110L331D-TR and other substitutes?

A: The RP110L331D-TR is distinguished by exceptionally low quiescent current (2 µA) compared to RP109L331D-TR (70 µA) and RP112K331B-TR (100 µA). This characteristic makes it suitable for battery-powered applications where standby current consumption must be minimized. Dropout voltage is 0.35V @ 150mA, which is acceptable for most applications but represents the highest value among available substitutes.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes. All substitute parts listed (RP109L331D-TR, RP110L331D-TR, RP112K331D-TR) are supplied in Tape & Reel (TR) packaging format, matching the original RP112K331B-TR configuration for automated assembly compatibility.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. RP109L331D-TR, RP110L331D-TR, and RP112K331D-TR carry REACH Unaffected status. The original RP112K331B-TR is RoHS Compliant. All parts are classified under ECCN EAR99 and HTSUS 8542.39.0001.

Q: Can RP112K331D-TR replace RP112K331B-TR in existing designs?

A: Yes. RP112K331D-TR is functionally identical to RP112K331B-TR, sharing the same electrical specifications (0.28V dropout voltage, 100 µA quiescent current, 80dB ~ 65dB PSRR), package type (4-UDFN Exposed Pad), and operating temperature range (-40°C ~ 85°C). The primary distinction is RoHS3 compliance status of the substitute.

Q: What is the significance of dropout voltage differences among substitutes?

A: Dropout voltage determines the minimum input-to-output voltage differential required for proper regulator operation. RP112K331B-TR and RP112K331D-TR require 0.28V minimum differential, RP109L331D-TR requires 0.32V, and RP110L331D-TR requires 0.35V. Applications with tight input voltage margins must account for these specifications during design verification.

Q: Are there inventory considerations when selecting substitutes?

A: Inventory levels vary significantly among substitutes. RP110L331D-TR maintains the highest inventory (100,068 Pcs), followed by RP109L331D-TR (305,400 Pcs) and RP112K331D-TR (26,300 Pcs). The original RP112K331B-TR has 1,128 Pcs available. Inventory status should be verified at time of procurement.

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