R1121N331A-TR-FE Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The R1121N331A-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 3.3V output at 150mA in a surface-mount SOT-23-5 package format. The regulator incorporates enable control and over-current protection features, operating across the industrial temperature range of -40°C to 85°C.

Equivalent and substitute parts are identified when component availability becomes constrained, supply chain disruptions occur, or inventory requirements necessitate alternative sourcing from the same manufacturer's product portfolio. Substitute parts maintain electrical and mechanical compatibility while potentially offering different product revisions or series designations.

Substiute Parts

R1121N331A-TR-FE

Nisshinbo Micro Devices Inc.In Stock: 1083R1121N331A-TR-FE Datasheet

Current PartRFQ

R1111N331B-TR-FE

Nisshinbo Micro Devices Inc.In Stock: 6039R1111N331B-TR-FE Datasheet

Parametric EquivalentRFQ

R1121N331B-TR-FE

Nisshinbo Micro Devices Inc.In Stock: 2695R1121N331B-TR-FE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the R1121N331A-TR-FE are identified based on strict electrical and mechanical parameter matching. The substitution criteria include:

Electrical Parameters (Must Match):

• Fixed output voltage: 3.3V
• Output current rating: 150mA
• Maximum input voltage: 8V
• Dropout voltage: 0.3V @ 100mA
• Quiescent current: 70 µA
• PSRR: 70dB (1kHz)
• Control features: Enable function
• Protection features: Over-current protection
• Operating temperature range: -40°C to 85°C

Mechanical Parameters (Must Match):

• Package type: SOT-23-5
• Mounting type: Surface Mount
• Supplier device package: SOT-23-5

Acceptable Variations:

• Series designation (R1111N vs. R1121N)
• Product revision letter (A vs. B)
• RoHS compliance status (RoHS Compliant vs. ROHS3 Compliant)
• REACH status documentation

The identified substitutes maintain full electrical and mechanical compatibility with the original part number while differing only in manufacturer revision levels and regulatory compliance documentation.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active product status with Nisshinbo Micro Devices Inc. and are suitable for direct substitution based on electrical and mechanical parameter equivalence.

R1111N331B-TR-FE offers ROHS3 compliance and REACH Unaffected status, representing a newer regulatory revision. This part is available in higher inventory quantity (5983 pcs) compared to the main part number.

R1121N331B-TR-FE maintains the same base series designation as the main part (R1121N) while incorporating ROHS3 compliance and REACH Unaffected status. This part represents a direct series match with updated regulatory documentation and is available in moderate inventory (2627 pcs).

Selection between substitute parts depends on supply chain requirements, inventory availability, and regulatory documentation preferences. All three parts deliver identical electrical performance and mechanical compatibility for the specified application.

Frequently Asked Questions (FAQ)

Q: Can R1111N331B-TR-FE replace R1121N331A-TR-FE in production designs?

A: Yes. Both parts deliver identical electrical specifications including 3.3V fixed output, 150mA current rating, 0.3V dropout voltage, and 70dB PSRR. The SOT-23-5 package and surface-mount configuration are identical. The primary difference is the series designation (R1111N vs. R1121N) and product revision level (B vs. A).

Q: What is the difference between R1121N331A-TR-FE and R1121N331B-TR-FE?

A: Both parts share the same R1121N series designation and deliver identical electrical performance. The difference is the product revision letter (A vs. B) and RoHS compliance status. R1121N331B-TR-FE incorporates ROHS3 compliance and REACH Unaffected documentation, representing a newer regulatory revision of the same series.

Q: Are all three parts compatible with the same PCB layout?

A: Yes. All three parts use the SOT-23-5 package format with identical pin configuration, mechanical dimensions, and surface-mount footprint. No PCB layout modifications are required when substituting between these parts.

Q: What is the inventory status for each substitute part?

A: R1121N331A-TR-FE (main part): 1041 pcs. R1111N331B-TR-FE: 5983 pcs. R1121N331B-TR-FE: 2627 pcs. All parts are listed as new original stock.

Q: Do the substitute parts have different thermal or performance characteristics?

A: No. All three parts maintain identical quiescent current (70 µA), dropout voltage (0.3V @ 100mA), PSRR (70dB at 1kHz), and operating temperature range (-40°C to 85°C). Thermal and performance characteristics are equivalent across all substitutes.

Q: What is the moisture sensitivity level for these parts?

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

Q: Are there any compliance differences between the substitute parts?

A: R1121N331A-TR-FE carries RoHS Compliant status. Both R1111N331B-TR-FE and R1121N331B-TR-FE carry ROHS3 Compliant status and REACH Unaffected documentation. All parts meet applicable regulatory requirements for their respective designations.