R1122N331B-TR-FE Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The R1122N331B-TR-FE is an active linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc. This positive fixed output regulator delivers 150mA at 3.3V with a maximum input voltage of 6V. The device is housed in a SOT-23-5 surface mount package and includes enable control and over-current protection features. The part is RoHS compliant and carries an unlimited moisture sensitivity level rating.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set. Alternative models may be required due to inventory availability, supply chain considerations, or design revision updates 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
Package Type	SOT-23-5 (SC-74A)	—
Output Configuration	Positive Fixed	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-40 to 85	°C
Protection Features	Over Current	—

Substitute Part Grouping Explanation

Substitute parts for the R1122N331B-TR-FE are qualified based on the following criteria:

Electrical Equivalence Parameters:

Fixed output voltage of 3.3V
Output current rating of 150mA
Maximum input voltage of 6V
Operating temperature range of -40°C to 85°C
Over-current protection feature
Positive output configuration

Mechanical Compatibility Parameters:

SOT-23-5 package (SC-74A, SOT-753)
Surface mount technology
Tape & Reel packaging format

Compliance Parameters:

RoHS compliance status
Moisture sensitivity level 1 (unlimited)
Active product status

The R1180N331B-TR-FE and R1180N331C-TR-FE meet all electrical and mechanical requirements for direct substitution. Both parts maintain identical output voltage, current rating, input voltage limits, temperature range, and package configuration. Differences in quiescent current, dropout voltage, and control features are noted in the parameter comparison table below.

Parameter Comparison

Parameter	R1122N331B-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
Voltage Dropout (Maximum)	0.26 @ 100mA	0.4 @ 150mA	0.4 @ 150mA	V
Quiescent Current (Iq)	170	1.5	1.5	µA
PSRR	80 @ 1kHz	—	—	dB
Control Features	Enable	Enable	—	—
Protection Features	Over Current	Over Current	Over Current	—
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	—
Operating Temperature	-40 to 85	-40 to 85	-40 to 85	°C
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—
Product Status	Active	Active	Active	—

Engineering Selection Recommendations

R1122N331B-TR-FE (Primary Part)

The R1122N331B-TR-FE is the primary specification with active product status and RoHS compliance. This part features a lower dropout voltage of 0.26V at 100mA and includes PSRR specification of 80dB at 1kHz. The enable control feature is present. Current inventory is 4250 units.

R1180N331B-TR-FE (Substitute - Preferred)

The R1180N331B-TR-FE is a parametric equivalent with active product status and ROHS3 compliance. This substitute maintains identical output voltage, current rating, and package configuration. The quiescent current is significantly lower at 1.5µA compared to 170µA in the primary part. The dropout voltage is 0.4V at 150mA. The enable control feature is present. Current inventory is 4200 units. This part is suitable for applications where lower quiescent current is beneficial.

R1180N331C-TR-FE (Substitute - Alternative)

The R1180N331C-TR-FE is a parametric equivalent with active product status and ROHS3 compliance. This substitute maintains identical output voltage, current rating, and package configuration. The quiescent current is 1.5µA. The dropout voltage is 0.4V at 150mA. The enable control feature is not specified for this variant. Current inventory is 3976 units. This part is suitable for applications where the enable control feature is not required.

All three parts are manufactured by Nisshinbo Micro Devices Inc., carry unlimited moisture sensitivity level ratings, and operate across the -40°C to 85°C temperature range. Selection between substitutes depends on specific application requirements regarding quiescent current performance, dropout voltage characteristics, and control feature necessity.

Frequently Asked Questions (FAQ)

Q: Can R1180N331B-TR-FE replace R1122N331B-TR-FE in all applications?

A: The R1180N331B-TR-FE maintains electrical equivalence in output voltage (3.3V), output current (150mA), input voltage limits (6V maximum), and package configuration (SOT-23-5). The primary differences are lower quiescent current (1.5µA versus 170µA) and higher dropout voltage (0.4V at 150mA versus 0.26V at 100mA). Applications sensitive to quiescent current performance will benefit from the R1180N331B-TR-FE. Applications requiring minimal dropout voltage at full load may require evaluation of the R1122N331B-TR-FE.

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

A: Both parts share identical electrical specifications including output voltage, current rating, input voltage limits, quiescent current, and dropout voltage. The R1180N331C-TR-FE does not include the enable control feature present in the R1180N331B-TR-FE. Select the R1180N331C-TR-FE only when the enable control function is not required in the application.

Q: Are all three parts pin-compatible?

A: All three parts use the SOT-23-5 package (SC-74A, SOT-753) and are surface mount devices. Pin compatibility is maintained across all three parts for the specified package type.

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

A: The R1122N331B-TR-FE carries RoHS compliance status. The R1180N331B-TR-FE and R1180N331C-TR-FE carry ROHS3 compliance status. Both compliance levels indicate restriction of hazardous substances. ROHS3 represents the current regulatory standard. Both are acceptable for applications requiring RoHS compliance.

Q: Can I use R1180N331C-TR-FE if my design requires the enable control feature?

A: No. The R1180N331C-TR-FE does not include the enable control feature. Use R1180N331B-TR-FE or R1122N331B-TR-FE if enable control functionality is required in the application.

Q: What is the significance of the lower quiescent current in R1180 series parts?

A: The R1180N331B-TR-FE and R1180N331C-TR-FE have quiescent current of 1.5µA compared to 170µA in the R1122N331B-TR-FE. Lower quiescent current reduces standby power consumption and heat generation, which is beneficial in battery-powered or low-power applications.

Q: Are there REACH compliance considerations for these parts?

A: The R1180N331B-TR-FE and R1180N331C-TR-FE carry REACH Unaffected status. The R1122N331B-TR-FE does not specify REACH status in the provided parameters. For applications requiring REACH compliance documentation, the R1180 series parts provide explicit compliance confirmation.

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