R1111N331A-TR-FE Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The R1111N331A-TR-FE is an active linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc., classified as a Power Management (PMIC) component. This device provides a fixed positive 3.3V output at 150mA in a surface-mount SOT-23-5 package. The regulator includes enable control and over-current protection features, operating across the industrial temperature range of -40°C to 85°C.

Substitute parts are identified when component availability becomes limited, supply chain disruptions occur, or inventory requirements necessitate alternative sourcing while maintaining full electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	150mA
Input Voltage (Max)	8V
Voltage Dropout (Max)	0.3V @ 100mA
Quiescent Current	70 µA
PSRR	70dB (1kHz)
Package Type	SOT-23-5 (SC-74A, SOT-753)
Mounting Type	Surface Mount
Operating Temperature Range	-40°C to 85°C
Control Features	Enable
Protection Features	Over Current

Substitute Part Grouping Explanation

Substitute parts for the R1111N331A-TR-FE are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

Output voltage: 3.3V fixed
Output current capability: 150mA
Maximum input voltage: 8V
Voltage dropout: 0.3V @ 100mA
Quiescent current: 70 µA
PSRR: 70dB (1kHz)
Package: SOT-23-5 (SC-74A, SOT-753)
Control features: Enable function
Protection: Over-current protection
Operating temperature: -40°C to 85°C

All substitute parts listed maintain identical electrical specifications and physical packaging, ensuring direct functional replacement without circuit redesign or PCB modification.

Parameter Comparison

Parameter	R1111N331A-TR-FE	R1111N331B-TR-FE	R1121N331B-TR-FE
Manufacturer	Nisshinbo Micro Devices Inc.	Nisshinbo Micro Devices Inc.	Nisshinbo Micro Devices Inc.
Category	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)
Output Voltage (Fixed)	3.3V	3.3V	3.3V
Output Current	150mA	150mA	150mA
Input Voltage (Max)	8V	8V	8V
Voltage Dropout (Max)	0.3V @ 100mA	0.3V @ 100mA	0.3V @ 100mA
Quiescent Current	70 µA	70 µA	70 µA
PSRR	70dB (1kHz)	70dB (1kHz)	70dB (1kHz)
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753
Supplier Device Package	SOT-23-5	SOT-23-5	SOT-23-5
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Control Features	Enable	Enable	Enable
Protection Features	Over Current	Over Current	Over Current
Product Status	Active	Active	Active
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99	EAR99
HTSUS	8542.39.0001	8542.39.0001	8542.39.0001

Engineering Selection Recommendations

R1111N331B-TR-FE is a parametric equivalent substitute with identical electrical and mechanical specifications. This part carries ROHS3 compliance status and includes REACH Unaffected designation, providing enhanced regulatory documentation compared to the primary part.

R1121N331B-TR-FE is a parametric equivalent substitute from the R1121N series. All electrical parameters, package specifications, and control features remain identical to the primary part. This device also carries ROHS3 compliance and REACH Unaffected status. The series designation change (R1121N versus R1111N) reflects internal manufacturer design revision while maintaining full functional compatibility.

Both substitute parts are active products with confirmed inventory availability. Selection between alternatives should be based on supply chain availability, lead time requirements, and inventory levels at the time of procurement.

Frequently Asked Questions (FAQ)

Q: Can R1111N331B-TR-FE be used as a direct replacement for R1111N331A-TR-FE?

A: Yes. The R1111N331B-TR-FE maintains identical electrical specifications, output voltage, current rating, package type, and control features. No circuit modifications or PCB changes are required for substitution.

Q: What is the difference between R1111N331A-TR-FE and R1121N331B-TR-FE?

A: Both parts provide identical electrical performance: 3.3V fixed output at 150mA with matching dropout voltage, quiescent current, and PSRR characteristics. The series designation change (R1111N to R1121N) indicates an internal manufacturer design revision. Both are housed in SOT-23-5 packages and operate across -40°C to 85°C.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All listed substitute parts are supplied in Tape & Reel (TR) format with SOT-23-5 package configuration (SC-74A, SOT-753 case designation), ensuring compatibility with automated assembly equipment and standard PCB layouts.

Q: Do the substitute parts have the same compliance certifications?

A: The primary part R1111N331A-TR-FE carries RoHS Compliant status. Both substitute parts (R1111N331B-TR-FE and R1121N331B-TR-FE) carry ROHS3 Compliant status with REACH Unaffected designation, providing updated regulatory compliance documentation. All parts share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Q: What control and protection features are present in all substitute parts?

A: All parts include Enable control functionality and Over-Current protection. These features are maintained across all substitute options, ensuring consistent circuit behavior and safety characteristics.

Q: Is the moisture sensitivity level the same across all parts?

A: Yes. All parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage or handling.

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