RP112K121B-TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RP112K121B-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 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 critical parameters including output voltage, current capacity, package type, and thermal operating range. Alternative models may be required due to inventory availability, supply chain considerations, or specific performance optimization needs within acceptable parametric tolerances.

Substiute Parts

RP112K121B-TR

Nisshinbo Micro Devices Inc.In Stock: 875RP112K121B-TR Datasheet

Current PartRFQ

RP109L121D-TR

Nisshinbo Micro Devices Inc.In Stock: 9833RP109L121D-TR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RP112K121B-TR are identified based on strict parametric equivalence across the following critical criteria:

Electrical Equivalence Requirements:

• Fixed output voltage of 1.2V
• Output current capacity of 150mA
• Maximum input voltage of 5.25V
• Enable control functionality
• Over-current protection

Mechanical Equivalence Requirements:

• 4-UDFN Exposed Pad package (DFN(PL)1010-4)
• Surface mount configuration
• Operating temperature range of -40°C to +85°C

Compliance Requirements:

• RoHS Compliant status
• Moisture Sensitivity Level 1 (Unlimited)

The RP109L121D-TR meets all mandatory electrical and mechanical parameters while maintaining identical package specifications and compliance certifications. Variations in dropout voltage and quiescent current represent performance improvements within the same functional class and do not affect substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

Both the RP112K121B-TR and RP109L121D-TR are active products manufactured by Nisshinbo Micro Devices Inc. with full RoHS compliance and identical moisture sensitivity ratings. Selection between these parts is based on application-specific requirements and inventory availability.

The RP112K121B-TR operates with a maximum dropout voltage of 0.8V and quiescent current of 100µA. The RP109L121D-TR provides improved performance characteristics with a maximum dropout voltage of 0.67V and reduced quiescent current of 70µA. Both devices maintain identical output voltage, current capacity, package configuration, and operating temperature specifications.

For applications requiring lower power dissipation or reduced dropout voltage, the RP109L121D-TR is the appropriate selection. For applications with existing design validation on the RP112K121B-TR, continued use of this part is supported by equivalent electrical and mechanical specifications.

Frequently Asked Questions (FAQ)

Q: Can the RP109L121D-TR directly replace the RP112K121B-TR in existing designs?

A: Yes. Both parts are pin-compatible 4-UDFN Exposed Pad devices with identical output voltage (1.2V), output current (150mA), input voltage rating (5.25V maximum), and operating temperature range (-40°C to +85°C). Enable control and over-current protection functions are present on both devices.

Q: What are the differences between these two parts?

A: The RP109L121D-TR features improved performance with lower dropout voltage (0.67V versus 0.8V at 150mA) and reduced quiescent current (70µA versus 100µA). These differences do not affect functional compatibility or package compatibility.

Q: Are both parts RoHS compliant?

A: Yes. Both the RP112K121B-TR and RP109L121D-TR are RoHS Compliant with Moisture Sensitivity Level 1 (Unlimited).

Q: What is the package type for both parts?

A: Both parts use the 4-UDFN Exposed Pad package (DFN(PL)1010-4) configured for surface mount assembly.

Q: Which part should be selected for new designs?

A: Selection is based on application requirements and inventory availability. The RP109L121D-TR offers superior performance characteristics with lower dropout voltage and quiescent current. Both parts are active products suitable for new designs.

Q: Are there any thermal or operating condition differences?

A: Both parts operate across the identical temperature range of -40°C to +85°C. The RP109L121D-TR generates less heat due to lower quiescent current, which may provide thermal advantages in power-constrained applications.