R1122N331A-TR-FE Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The R1122N331A-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 equivalent electrical performance and mechanical compatibility are maintained across critical parameters. Alternative models may be required due to inventory availability, supply chain considerations, or specific compliance requirements while maintaining functional equivalence in the target application.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	3.3	V
Output Current	150	mA
Input Voltage (Maximum)	6	V
Dropout Voltage	0.26	V @ 100mA
Quiescent Current	170	µA
PSRR	80	dB @ 1kHz
Operating Temperature Range	-40 to 85	°C
Package Type	SOT-23-5 (SC-74A)	Surface Mount
Output Configuration	Positive Fixed	1 Output
Control Features	Enable	—
Protection Features	Over Current	—

Substitute Part Grouping Explanation

Substitute parts for the R1122N331A-TR-FE are identified based on strict electrical and mechanical parameter equivalence. The substitution criteria are defined by the following parameters:

Critical Matching Parameters:

Output voltage (fixed at 3.3V)
Output current capability (150mA)
Maximum input voltage (6V)
Operating temperature range (-40°C to 85°C)
Package type (SOT-23-5 surface mount)
Output configuration (positive, single output)
Protection features (over-current protection)

Allowable Parameter Variations:

Dropout voltage: Substitute parts may exhibit different dropout characteristics while maintaining functional operation within the specified input and output voltage constraints
Quiescent current: Variations in standby current consumption are acceptable provided the device remains within specified operating parameters
PSRR: Power supply rejection ratio may differ between substitute parts
Control features: Enable functionality may vary between models

The R1180N331B-TR-FE and R1180N331C-TR-FE meet all critical matching parameters and are classified as parametric equivalents to the R1122N331A-TR-FE.

Parameter Comparison

Parameter	R1122N331A-TR-FE	R1180N331B-TR-FE	R1180N331C-TR-FE	Unit
Manufacturer	Nisshinbo Micro Devices Inc.	Nisshinbo Micro Devices Inc.	Nisshinbo Micro Devices Inc.	—
Output Voltage (Fixed)	3.3	3.3	3.3	V
Output Current	150	150	150	mA
Input Voltage (Maximum)	6	6	6	V
Dropout Voltage (Maximum)	0.26 @ 100mA	0.4 @ 150mA	0.4 @ 150mA	V
Quiescent Current	170	1.5	1.5	µA
PSRR	80 @ 1kHz	Not Specified	Not Specified	dB
Operating Temperature Range	-40 to 85	-40 to 85	-40 to 85	°C
Package Type	SOT-23-5 (SC-74A)	SOT-23-5 (SC-74A)	SOT-23-5 (SC-74A)	Surface Mount
Output Configuration	Positive Fixed	Positive Fixed	Positive Fixed	1 Output
Protection Features	Over Current	Over Current	Over Current	—
Control Features	Enable	Enable	Not Specified	—
Product Status	Active	Active	Active	—
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—

Engineering Selection Recommendations

R1122N331A-TR-FE (Primary Part): The R1122N331A-TR-FE is the original specification part with active product status. This device features superior dropout voltage performance (0.26V @ 100mA) and specified PSRR of 80dB at 1kHz, making it suitable for applications requiring low-noise regulation and minimal headroom loss. RoHS compliance is confirmed. Current inventory is 680 pieces.

R1180N331B-TR-FE (Substitute - Recommended): The R1180N331B-TR-FE is a parametric equivalent with active product status and ROHS3 compliance. This device maintains identical output voltage, current, and temperature specifications. The primary difference is increased dropout voltage (0.4V @ 150mA) and significantly reduced quiescent current (1.5µA versus 170µA). This substitute is suitable for applications where lower standby power consumption is beneficial and the higher dropout voltage remains within system design margins. Enable control feature is retained. Inventory availability is 4200 pieces.

R1180N331C-TR-FE (Substitute - Alternative): The R1180N331C-TR-FE is a parametric equivalent with active product status and ROHS3 compliance. Electrical specifications are identical to the R1180N331B-TR-FE, with the exception that enable control feature is not specified. This device is suitable for fixed-output applications where enable control is not required. Inventory availability is 3976 pieces.

Selection Criteria:

Use R1122N331A-TR-FE when low dropout voltage and specified PSRR performance are critical design requirements
Use R1180N331B-TR-FE when reduced quiescent current and enable control functionality are required
Use R1180N331C-TR-FE when reduced quiescent current is required and enable control is not needed

All three parts share identical package type, output voltage, output current, input voltage rating, operating temperature range, and over-current protection. All parts are manufactured by Nisshinbo Micro Devices Inc. and maintain RoHS compliance.

Frequently Asked Questions (FAQ)

Q: Can R1180N331B-TR-FE be used as a direct replacement for R1122N331A-TR-FE?

A: Yes, the R1180N331B-TR-FE is a parametric equivalent and direct substitute. Both devices provide 3.3V fixed output at 150mA in identical SOT-23-5 packages. The primary difference is dropout voltage (0.4V versus 0.26V) and quiescent current (1.5µA versus 170µA). Verify that the higher dropout voltage does not exceed your system's input voltage margin.

Q: What is the difference between R1180N331B-TR-FE and R1180N331C-TR-FE?

A: Both devices are electrically identical with 3.3V output, 150mA current, and identical dropout voltage specifications. The R1180N331B-TR-FE includes enable control functionality, while the R1180N331C-TR-FE does not specify this feature. Select R1180N331B-TR-FE if enable control is required in your application.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the SOT-23-5 (SC-74A) package with identical pin configuration, enabling direct PCB-level substitution without layout modifications.

Q: What is the significance of the dropout voltage difference?

A: Dropout voltage is the minimum voltage difference required between input and output for proper regulation. The R1122N331A-TR-FE requires 0.26V headroom at 100mA, while R1180N331B-TR-FE and R1180N331C-TR-FE require 0.4V at 150mA. Applications with tight input voltage margins must account for this difference.

Q: Which part has the lowest power consumption in standby mode?

A: The R1180N331B-TR-FE and R1180N331C-TR-FE both feature quiescent current of 1.5µA, compared to 170µA for the R1122N331A-TR-FE. This represents a 99% reduction in standby current consumption.

Q: Are all parts RoHS compliant?

A: Yes. The R1122N331A-TR-FE is RoHS compliant. The R1180N331B-TR-FE and R1180N331C-TR-FE are ROHS3 compliant. All parts meet environmental compliance requirements.

Q: What is the PSRR specification for the R1180 series?

A: PSRR is not specified for R1180N331B-TR-FE or R1180N331C-TR-FE. The R1122N331A-TR-FE specifies 80dB PSRR at 1kHz. Applications requiring specified noise rejection should use the R1122N331A-TR-FE.

Q: Can these parts be used interchangeably in existing designs?

A: Electrical interchangeability is confirmed for all three parts within the specified operating parameters. However, design verification is required to confirm that dropout voltage differences and quiescent current variations do not impact system performance in your specific application.

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