R1131N121A-TR-FE Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The R1131N121A-TR-FE is an active linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc., classified as a Power Management (PMIC) component. This device delivers a fixed positive 1.2V output at 300mA with integrated over-current protection and enable control features. The part is supplied in SOT-23-5 surface mount packaging on tape and reel.

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain disruptions, or end-of-life considerations while maintaining electrical and mechanical compatibility within the application circuit.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	1.2	V
Output Current	300	mA
Input Voltage (Maximum)	6	V
Voltage Dropout (Maximum)	0.7	V @ 300mA
Quiescent Current	111	µA
PSRR	65	dB (1kHz)
Package Type	SOT-23-5 (SC-74A)	Surface Mount
Operating Temperature Range	-40 to 85	°C
Control Features	Enable	—
Protection Features	Over Current	—

Substitute Part Grouping Explanation

Substitute parts for the R1131N121A-TR-FE are identified based on strict parametric equivalence across the following critical criteria:

Electrical Compatibility Parameters:

Fixed output voltage: 1.2V
Output current capacity: 300mA
Maximum input voltage: 6V
Quiescent current: 111µA
PSRR specification: 65dB at 1kHz
Control and protection features: Enable function and over-current protection

Mechanical Compatibility Parameters:

Package type: SOT-23-5 (SC-74A)
Mounting type: Surface Mount
Tape and Reel (TR) packaging format

Compliance Parameters:

RoHS compliance status
Moisture Sensitivity Level (MSL): 1
Operating temperature range: -40°C to 85°C

The R1161N121B-TR-FE qualifies as a parametric equivalent substitute based on matching all electrical output specifications, identical package configuration, and compatible control/protection features.

Parameter Comparison

Parameter	R1131N121A-TR-FE	R1161N121B-TR-FE	Match Status
Manufacturer	Nisshinbo Micro Devices Inc.	Nisshinbo Micro Devices Inc.	Identical
Output Voltage (Fixed)	1.2V	1.2V	Identical
Output Current	300mA	300mA	Identical
Input Voltage (Maximum)	6V	6V	Identical
Voltage Dropout (Maximum)	0.7V @ 300mA	0.75V @ 300mA	Compatible
Quiescent Current	111µA	111µA	Identical
PSRR	65dB (1kHz)	65dB (1kHz)	Identical
Package Type	SOT-23-5 (SC-74A)	SOT-23-5 (SC-74A)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Operating Temperature Range	-40°C to 85°C	-40°C to 85°C	Identical
Control Features	Enable	Enable	Identical
Protection Features	Over Current	Over Current	Identical
RoHS Status	RoHS Compliant	ROHS3 Compliant	Compatible
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical
Product Status	Active	Active	Identical

Engineering Selection Recommendations

R1131N121A-TR-FE (Primary Part):

Active product status with 1033 units in stock
RoHS Compliant certification
Established supply availability

R1161N121B-TR-FE (Substitute Part):

Active product status with 3823 units in stock
ROHS3 Compliant certification (enhanced compliance standard)
REACH Unaffected status documented
Higher inventory availability
Voltage dropout specification of 0.75V @ 300mA represents a 0.05V increase compared to the primary part; this differential remains within acceptable tolerance for fixed 1.2V output applications

Both parts share identical electrical performance in output voltage, current capacity, quiescent current, and PSRR characteristics. The substitute part demonstrates superior supply chain availability and current compliance certifications. Selection between these parts depends on inventory requirements and supply chain priorities rather than functional performance differences.

Frequently Asked Questions (FAQ)

Q: Can the R1161N121B-TR-FE directly replace the R1131N121A-TR-FE in existing designs?

A: Yes. Both parts deliver identical fixed 1.2V output at 300mA with matching SOT-23-5 package pinouts, enable control, and over-current protection. The 0.05V increase in maximum dropout voltage (0.75V versus 0.7V) does not affect circuit operation for standard 1.2V regulator applications.

Q: Are the PCB footprints identical between these parts?

A: Yes. Both parts use the SOT-23-5 (SC-74A) surface mount package, ensuring identical PCB footprint compatibility without layout modifications.

Q: What is the difference between RoHS and ROHS3 compliance?

A: ROHS3 represents the current revision of the Restriction of Hazardous Substances directive with updated substance restrictions. Both certifications confirm absence of prohibited materials; ROHS3 reflects the most recent regulatory standard.

Q: Do these parts require different handling or storage procedures?

A: No. Both parts carry Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture control requirements during storage or handling.

Q: Can I use the R1161N121B-TR-FE in applications requiring the lowest possible dropout voltage?

A: The R1131N121A-TR-FE specifies 0.7V maximum dropout versus 0.75V for the R1161N121B-TR-FE. For applications with strict dropout voltage requirements, the R1131N121A-TR-FE is the specified choice. For standard 1.2V regulation applications, the 0.05V difference is not functionally significant.

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

A: Both parts operate across -40°C to 85°C, providing identical thermal performance specifications.

Q: Are both parts available in tape and reel packaging?

A: Yes. Both the R1131N121A-TR-FE and R1161N121B-TR-FE are supplied in tape and reel (TR) format for automated assembly processes.

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