RP173K331A-TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RP173K331A-TR is an active linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc. This device functions as a positive fixed output regulator delivering 3.3V at 150mA output current in a compact 4-UDFN surface mount package. The part is classified under Power Management (PMIC) and is currently in active production status with 8767 units in stock. Substitute parts are identified when inventory constraints, lead time requirements, or procurement preferences necessitate alternative sourcing while maintaining identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer	Nisshinbo Micro Devices Inc.
Category	Power Management (PMIC)
Output Voltage (Fixed)	3.3V
Output Current	150mA
Input Voltage (Max)	11V
Dropout Voltage (Max)	1.05V @ 150mA
Quiescent Current	3.7 µA
Package Type	4-UDFN Exposed Pad
Supplier Device Package	DFN(PL)1010-4
Operating Temperature Range	-40°C ~ 85°C (TA)
Control Features	Enable
Protection Features	Over Current, Reverse Current
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the RP173K331A-TR are identified based on strict parametric equivalence across all critical electrical and mechanical specifications. The substitution logic is based on the following key parameters that must remain identical:

Electrical Parameters:

Output voltage: 3.3V fixed
Output current capability: 150mA
Input voltage maximum: 11V
Dropout voltage: 1.05V @ 150mA
Quiescent current: 3.7 µA
Control features: Enable function
Protection features: Over Current and Reverse Current protection

Mechanical Parameters:

Package type: 4-UDFN Exposed Pad
Supplier device package: DFN(PL)1010-4
Mounting type: Surface Mount

Compliance Parameters:

RoHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)
Operating temperature range: -40°C ~ 85°C

The RP173K331B-TR meets all these criteria and is classified as a parametric equivalent substitute.

Parameter Comparison

Parameter	RP173K331A-TR	RP173K331B-TR	Match
Manufacturer	Nisshinbo Micro Devices Inc.	Nisshinbo Micro Devices Inc.	✓
Series	RP173x	RP173x	✓
Output Voltage (Fixed)	3.3V	3.3V	✓
Output Current	150mA	150mA	✓
Input Voltage (Max)	11V	11V	✓
Dropout Voltage (Max)	1.05V @ 150mA	1.05V @ 150mA	✓
Quiescent Current	3.7 µA	3.7 µA	✓
Package Type	4-UDFN Exposed Pad	4-UDFN Exposed Pad	✓
Supplier Device Package	DFN(PL)1010-4	DFN(PL)1010-4	✓
Operating Temperature Range	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	✓
Control Features	Enable	Enable	✓
Protection Features	Over Current, Reverse Current	Over Current, Reverse Current	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	✓
Product Status	Active	Active	✓

Engineering Selection Recommendations

Both the RP173K331A-TR and RP173K331B-TR are active production parts manufactured by Nisshinbo Micro Devices Inc. with identical electrical specifications and package configurations. Selection between these parts is based on availability and procurement logistics rather than technical performance differences.

The RP173K331A-TR currently maintains 8767 units in stock inventory. The RP173K331B-TR provides an alternative source with 13162 units available, offering higher inventory availability for high-volume applications or extended lead time mitigation.

Both parts carry ROHS3 compliance certification and REACH unaffected status, meeting regulatory requirements for industrial and commercial applications. The Moisture Sensitivity Level 1 rating indicates unlimited shelf life under standard storage conditions.

Selection of either part is appropriate for applications requiring a 3.3V fixed output linear regulator with 150mA current capability in surface mount DFN packaging for operating environments spanning -40°C to 85°C.

Frequently Asked Questions (FAQ)

Q: Can RP173K331B-TR be used as a direct replacement for RP173K331A-TR?

A: Yes. The RP173K331B-TR is a parametric equivalent with identical electrical specifications, output voltage, current rating, dropout voltage, quiescent current, and package configuration. Direct substitution is supported without circuit modification.

Q: Are there any differences in the package footprint between these parts?

A: No. Both parts use the 4-UDFN Exposed Pad package with DFN(PL)1010-4 supplier device package designation. PCB layout and footprint files are interchangeable.

Q: What is the operating temperature range for both parts?

A: Both the RP173K331A-TR and RP173K331B-TR operate across -40°C to 85°C ambient temperature range (TA).

Q: Do both parts include protection features?

A: Yes. Both parts incorporate Over Current and Reverse Current protection features as standard.

Q: What is the maximum input voltage for these regulators?

A: The maximum input voltage for both parts is 11V.

Q: Are these parts RoHS compliant?

A: Yes. Both the RP173K331A-TR and RP173K331B-TR are ROHS3 compliant and REACH unaffected.

Q: What is the dropout voltage specification?

A: The maximum dropout voltage for both parts is 1.05V when delivering 150mA output current.

Q: Can these parts be used in tape and reel packaging?

A: Yes. Both parts are supplied in Tape & Reel (TR) packaging format suitable for automated assembly processes.

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