RP112K281D-TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RP112K281D-TR is an active linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc. This positive fixed output regulator delivers 150mA at 2.8V with integrated enable control and over-current protection. The device is housed in a 4-UDFN Exposed Pad package suitable for surface mount applications across industrial and consumer electronics.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter range. The RP109L281D-TR serves as a parametric equivalent within the Nisshinbo linear regulator portfolio.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	2.8	V
Output Current	150	mA
Input Voltage (Maximum)	5.25	V
Package Type	4-UDFN Exposed Pad	DFN(PL)1010-4
Output Configuration	Positive Fixed	Single Output
Control Features	Enable	—
Protection Features	Over Current	—
Operating Temperature Range	-40 to 85	°C
Mounting Type	Surface Mount	—
RoHS Compliance	Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the RP112K281D-TR is determined by strict equivalence across the following critical parameters:

Mandatory 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)
Output configuration: Positive fixed single output
Control features: Enable function
Protection: Over-current protection
Operating temperature range: -40°C to 85°C
Mounting: Surface mount
RoHS compliance: Yes
MSL rating: 1 (Unlimited)

The RP109L281D-TR meets all mandatory matching parameters and qualifies as a parametric equivalent. Both devices are manufactured by Nisshinbo Micro Devices Inc., share identical electrical output specifications, and are housed in the same package footprint.

Parameter Comparison

Parameter	RP112K281D-TR	RP109L281D-TR	Compatibility
Manufacturer	Nisshinbo Micro Devices Inc.	Nisshinbo Micro Devices Inc.	Match
Output Voltage (Fixed)	2.8V	2.8V	Match
Output Current	150mA	150mA	Match
Input Voltage (Max)	5.25V	5.25V	Match
Voltage Dropout (Max)	0.28V @ 150mA	0.35V @ 150mA	Equivalent
Quiescent Current (Iq)	100 µA	70 µA	Equivalent
PSRR	80dB ~ 65dB (1kHz ~ 100kHz)	75dB (1kHz)	Equivalent
Package / Case	4-UDFN Exposed Pad	4-UDFN Exposed Pad	Match
Supplier Device Package	DFN(PL)1010-4	DFN(PL)1010-4	Match
Output Configuration	Positive Fixed	Positive Fixed	Match
Control Features	Enable	Enable	Match
Protection Features	Over Current	Over Current	Match
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Match
Mounting Type	Surface Mount	Surface Mount	Match
RoHS Status	Compliant	Compliant	Match
MSL Rating	1 (Unlimited)	1 (Unlimited)	Match
Product Status	Active	Active	Match

Engineering Selection Recommendations

Both the RP112K281D-TR and RP109L281D-TR are active products with full RoHS compliance and unlimited moisture sensitivity ratings, making them suitable for production environments without supply chain constraints.

RP112K281D-TR is the primary specification. Current inventory is 17,047 units.

RP109L281D-TR is the parametric equivalent with higher inventory availability (95,200 units). This substitute exhibits marginally higher dropout voltage (0.35V versus 0.28V at 150mA) and lower quiescent current (70µA versus 100µA). Both characteristics remain within acceptable operating margins for 2.8V fixed output applications. The RP109L281D-TR operates within the same temperature range and maintains identical package footprint compatibility.

Selection between these parts depends on application-specific requirements for dropout voltage performance and quiescent current consumption. Both devices satisfy the core functional requirements of a 2.8V, 150mA linear regulator with enable control and over-current protection in a surface-mount DFN package.

Frequently Asked Questions (FAQ)

Q: Can the RP109L281D-TR directly replace the RP112K281D-TR in existing designs?

A: Yes. Both devices share identical output voltage (2.8V), output current (150mA), package footprint (4-UDFN Exposed Pad), and control/protection features. The RP109L281D-TR exhibits slightly higher dropout voltage (0.35V versus 0.28V) and lower quiescent current (70µA versus 100µA), which are compatible with standard 2.8V regulator applications.

Q: What is the difference in dropout voltage between these parts?

A: The RP112K281D-TR has a maximum dropout of 0.28V at 150mA, while the RP109L281D-TR has a maximum dropout of 0.35V at 150mA. This 0.07V difference is negligible in most applications but should be verified if the input voltage margin is constrained.

Q: Are the package dimensions identical?

A: Yes. Both parts use the 4-UDFN Exposed Pad package (DFN(PL)1010-4) with identical footprints, allowing direct PCB layout compatibility without redesign.

Q: Do both parts support the same operating temperature range?

A: Yes. Both the RP112K281D-TR and RP109L281D-TR operate across -40°C to 85°C, meeting industrial and commercial temperature specifications.

Q: What is the significance of the quiescent current difference?

A: The RP109L281D-TR draws 70µA quiescent current compared to 100µA for the RP112K281D-TR. In battery-powered or low-power standby applications, the lower quiescent current of the RP109L281D-TR provides reduced power consumption during idle states.

Q: Are both parts RoHS compliant?

A: Yes. Both the RP112K281D-TR and RP109L281D-TR are RoHS compliant with MSL rating 1 (Unlimited), suitable for standard manufacturing and storage without moisture bake-out requirements.

Q: What control features are available on both regulators?

A: Both devices include an Enable control feature and over-current protection, allowing software-controlled power management and automatic fault protection in the event of output short-circuit conditions.

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