R1122N281A-TR-FE Equivalent & Substitute Parts

Part Overview

The R1122N281A-TR-FE is a linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc., classified as a Power Management (PMIC) component. This device provides a fixed positive output of 2.8V at 150mA in a surface-mount SOT-23-5 package. The part is actively produced and RoHS compliant, designed for applications requiring stable low-voltage regulation with integrated over-current protection and enable control features.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter ranges. Alternative models may be selected based on availability, inventory levels, manufacturer preference, or specific performance characteristics within acceptable tolerances.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	2.8V	V
Output Current	150	mA
Input Voltage (Max)	6	V
Voltage Dropout (Max)	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
Mounting Type	Surface Mount	-
Control Features	Enable	-
Protection Features	Over Current	-

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Output voltage (fixed): 2.8V
Output current rating: 150mA
Input voltage maximum: 6V
Operating temperature range: -40°C to 85°C
Control features: Enable function
Protection features: Over-current protection
Mounting type: Surface mount
Package classification: SOT-23-5 or SOT-25-5 (pin-compatible variants)

Performance Parameters (Allowed Variation):

Voltage dropout: Acceptable within design margin
Quiescent current: Lower values acceptable
PSRR: Variation acceptable if not specified as critical
Manufacturer: Cross-manufacturer substitution permitted

All identified substitute parts meet the mandatory equivalence criteria. Variations in dropout voltage, quiescent current, and PSRR reflect different design approaches while maintaining functional compatibility within the specified electrical and thermal operating envelope.

Parameter Comparison

Parameter	R1122N281A-TR-FE	R1114N281B-TR-FE	R1180N281B-TR-FE	XC6215B282MR-G	XC6504A281MR-G
Manufacturer	Nisshinbo	Nisshinbo	Nisshinbo	Torex	Torex
Output Voltage	2.8V	2.8V	2.8V	2.8V	2.8V
Output Current	150mA	150mA	150mA	150mA	150mA
Input Voltage (Max)	6V	6V	6V	6V	6V
Voltage Dropout (Max)	0.26V @ 100mA	0.35V @ 150mA	0.4V @ 150mA	0.58V @ 150mA	0.74V @ 150mA
Quiescent Current	170µA	95µA	1.5µA	1.5µA	1.27µA
PSRR	80dB (1kHz)	70-60dB (1kHz-10kHz)	Not specified	Not specified	Not specified
Operating Temperature	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C
Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-25-5	SOT-25-5
RoHS Status	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory (Pcs)	825	1183	3980	9875	3029

Engineering Selection Recommendations

Nisshinbo Micro Devices Inc. Series (Same Manufacturer):

The R1114N281B-TR-FE and R1180N281B-TR-FE are direct Nisshinbo alternatives maintaining identical package geometry (SOT-23-5) and electrical specifications. Both parts are actively produced and RoHS compliant. The R1114N281B-TR-FE exhibits lower quiescent current (95µA) compared to the primary part (170µA) with marginally higher dropout voltage (0.35V @ 150mA). The R1180N281B-TR-FE provides the lowest quiescent current (1.5µA) with the highest inventory availability (3980 pcs) and ROHS3 compliance, making it suitable for applications prioritizing low standby power consumption.

Torex Semiconductor Ltd. Series (Cross-Manufacturer):

The XC6215B282MR-G and XC6504A281MR-G are Torex equivalents utilizing SOT-25-5 packaging, which maintains pin compatibility with SOT-23-5 in most PCB layouts. Both parts are ROHS3 compliant with REACH unaffected status. The XC6215B282MR-G offers the highest inventory level (9875 pcs) with 1.5µA quiescent current. The XC6504A281MR-G provides intermediate quiescent current (1.27µA) with 3029 pcs available. Both Torex parts exhibit higher dropout voltages (0.58V and 0.74V respectively) compared to Nisshinbo alternatives, requiring verification of input voltage margin in power-constrained applications.

Selection Criteria:

Lowest Dropout Voltage: R1122N281A-TR-FE (0.26V @ 100mA)
Lowest Quiescent Current: R1180N281B-TR-FE and XC6215B282MR-G (1.5µA)
Highest Inventory Availability: XC6215B282MR-G (9875 pcs)
Same-Manufacturer Continuity: R1114N281B-TR-FE or R1180N281B-TR-FE
ROHS3 Compliance: R1180N281B-TR-FE, XC6215B282MR-G, XC6504A281MR-G

Frequently Asked Questions (FAQ)

Q: Can R1114N281B-TR-FE replace R1122N281A-TR-FE directly?

A: Yes. Both parts are Nisshinbo linear regulators with identical 2.8V output, 150mA current rating, 6V maximum input, SOT-23-5 package, and -40 to 85°C operating range. The R1114N281B-TR-FE has lower quiescent current (95µA vs. 170µA) and slightly higher dropout voltage (0.35V vs. 0.26V @ 100mA). Direct PCB substitution is supported without layout modification.

Q: What is the difference between SOT-23-5 and SOT-25-5 packages?

A: Both packages are pin-compatible with identical pin assignments and spacing. SOT-25-5 is a slightly larger variant of SOT-23-5. Torex parts (XC6215B282MR-G, XC6504A281MR-G) use SOT-25-5 packaging. PCB footprints designed for SOT-23-5 will accommodate SOT-25-5 components without electrical or mechanical issues.

Q: Which substitute part has the lowest power consumption?

A: The R1180N281B-TR-FE and XC6215B282MR-G both feature 1.5µA quiescent current, representing the lowest standby power consumption among all listed alternatives. The R1122N281A-TR-FE primary part has 170µA quiescent current, significantly higher than these alternatives.

Q: Are all substitute parts RoHS compliant?

A: Yes. The R1122N281A-TR-FE, R1114N281B-TR-FE are RoHS compliant. The R1180N281B-TR-FE, XC6215B282MR-G, and XC6504A281MR-G are ROHS3 compliant, representing the current RoHS standard. All parts meet regulatory requirements for lead-free manufacturing.

Q: What is the impact of higher dropout voltage in Torex parts?

A: The XC6215B282MR-G (0.58V dropout) and XC6504A281MR-G (0.74V dropout) require proportionally higher input voltage to maintain 2.8V output at 150mA compared to Nisshinbo parts. In applications with input voltage near the 6V maximum, Nisshinbo alternatives with lower dropout voltage (0.26-0.4V) provide greater design margin.

Q: Can I use XC6504A281MR-G in place of XC6215B282MR-G?

A: Yes. Both are Torex SOT-25-5 regulators with identical 2.8V output, 150mA current, and operating temperature range. The XC6504A281MR-G has slightly higher dropout voltage (0.74V vs. 0.58V) and lower quiescent current (1.27µA vs. 1.5µA). Direct substitution is supported.

Q: Which part offers the best inventory availability?

A: The XC6215B282MR-G has the highest inventory level at 9875 pcs. The R1180N281B-TR-FE offers 3980 pcs, and XC6504A281MR-G provides 3029 pcs. The primary R1122N281A-TR-FE has 825 pcs available.

Q: Are Torex parts suitable for all applications using Nisshinbo parts?

A: Torex parts are functionally equivalent for applications where the higher dropout voltage (0.58-0.74V) does not exceed design margins. Verify input voltage availability and thermal dissipation requirements. Both manufacturers provide identical control features (Enable) and protection (Over-current), ensuring functional compatibility.

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