RP112K121D-TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RP112K121D-TR is an active linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc. This positive fixed output regulator delivers 150mA at 1.2V with integrated enable control and over-current protection. The device is housed in a 4-UDFN Exposed Pad surface mount package and operates across the industrial temperature range of -40°C to 85°C.

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, inventory constraints, or when performance improvements in specific parameters align with application needs while maintaining functional compatibility.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	1.2	V
Output Current	150	mA
Input Voltage (Maximum)	5.25	V
Dropout Voltage (Maximum)	0.8	V @ 150mA
Quiescent Current	100	µA
Package Type	4-UDFN Exposed Pad	DFN(PL)1010-4
Operating Temperature Range	-40 to 85	°C
Control Features	Enable
Protection Features	Over Current

Substitute Part Grouping Explanation

Substitute parts for the RP112K121D-TR are identified based on strict parametric equivalence within the Power Management (PMIC) category. The substitution criteria are established by the following key parameters that must remain constant or compatible:

Critical Fixed Parameters:

Output voltage: 1.2V fixed
Output current capability: 150mA
Input voltage maximum: 5.25V
Package type: 4-UDFN Exposed Pad (DFN(PL)1010-4)
Operating temperature range: -40°C to 85°C
Control features: Enable function
Protection: Over-current protection
Mounting type: Surface Mount
RoHS compliance: Required
Moisture sensitivity level: MSL 1

Variable Parameters Allowing Substitution:

Dropout voltage (maximum)
Quiescent current (Iq)
PSRR specifications
Series designation (RP112x vs RP109x)

The RP109L121D-TR qualifies as a parametric equivalent because it maintains all critical fixed parameters while offering improved performance in dropout voltage and quiescent current characteristics.

Parameter Comparison

Parameter	RP112K121D-TR	RP109L121D-TR	Unit
Manufacturer	Nisshinbo Micro Devices Inc.	Nisshinbo Micro Devices Inc.
Category	Power Management (PMIC)	Power Management (PMIC)
Output Voltage (Fixed)	1.2	1.2	V
Output Current	150	150	mA
Input Voltage (Maximum)	5.25	5.25	V
Dropout Voltage (Maximum)	0.8 @ 150mA	0.67 @ 150mA	V
Quiescent Current	100	70	µA
Package Type	4-UDFN Exposed Pad	4-UDFN Exposed Pad	DFN(PL)1010-4
Operating Temperature Range	-40 to 85	-40 to 85	°C
Control Features	Enable	Enable
Protection Features	Over Current	Over Current
Mounting Type	Surface Mount	Surface Mount
RoHS Status	RoHS Compliant	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active

Engineering Selection Recommendations

Both the RP112K121D-TR and RP109L121D-TR are active products manufactured by Nisshinbo Micro Devices Inc. and carry full RoHS compliance certification. Both devices are suitable for direct substitution in applications requiring a 1.2V, 150mA linear voltage regulator with enable control and over-current protection in a 4-UDFN package.

The RP109L121D-TR offers improved performance characteristics with lower dropout voltage (0.67V versus 0.8V) and reduced quiescent current (70µA versus 100µA). These improvements result in lower power dissipation and reduced heat generation, which may provide advantages in thermally constrained or battery-powered applications.

Selection between these parts should be based on application-specific requirements regarding power efficiency and thermal performance, as both devices maintain identical functional specifications and package compatibility.

Frequently Asked Questions (FAQ)

Q: Can the RP109L121D-TR directly replace the RP112K121D-TR in existing designs?

A: Yes. Both devices share identical output voltage (1.2V), output current (150mA), input voltage rating (5.25V maximum), package type (4-UDFN Exposed Pad), operating temperature range (-40°C to 85°C), and control/protection features (Enable and Over-Current). Pin-to-pin compatibility is maintained.

Q: What are the differences between these two parts?

A: The RP109L121D-TR provides improved performance in two parameters: dropout voltage is reduced from 0.8V to 0.67V at 150mA, and quiescent current is reduced from 100µA to 70µA. These differences result in lower power dissipation during operation.

Q: Are both parts available in the same package?

A: Yes. Both the RP112K121D-TR and RP109L121D-TR are supplied in the 4-UDFN Exposed Pad package (DFN(PL)1010-4) with surface mount mounting type.

Q: Do both parts meet the same compliance standards?

A: Yes. Both devices are RoHS compliant with Moisture Sensitivity Level 1 (Unlimited), ECCN EAR99, and HTSUS 8542.39.0001 classification.

Q: Which part should be selected for new designs?

A: Selection should be based on application requirements. The RP109L121D-TR is suitable when lower power dissipation and reduced quiescent current provide system-level benefits. The RP112K121D-TR remains appropriate for applications where the specified performance parameters are sufficient.

Q: Are there any thermal or PCB layout differences between these parts?

A: Both devices use identical package geometry (4-UDFN Exposed Pad). PCB layout and thermal management considerations remain the same between the two parts.

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