RP173N331D-TR-FE Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RP173N331D-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 and is housed in a SOT-23-5 surface mount package. The device is designed for applications requiring stable low-voltage power supply regulation with integrated over-current and reverse-current protection features.

The RP173N331D-TR-FE remains in active production status. Substitute parts are identified to support component availability, supply chain continuity, and procurement flexibility while maintaining identical electrical and mechanical performance characteristics.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	3.3	V
Output Current	150	mA
Input Voltage (Maximum)	11	V
Dropout Voltage (Maximum)	1.05	V @ 150mA
Quiescent Current	3.7	µA
Operating Temperature Range	-40 to +85	°C
Package Type	SOT-23-5 (SC-74A)	Surface Mount
Protection Features	Over-Current, Reverse-Current	Integrated
Control Features	Enable	Functional

Substitute Part Grouping Explanation

Substitute parts for the RP173N331D-TR-FE are identified based on strict parametric equivalence within the RP173x series. Substitution eligibility is determined by the following criteria:

Critical Matching Parameters:

Output voltage: 3.3V fixed
Output current capacity: 150mA
Input voltage maximum: 11V
Dropout voltage: 1.05V @ 150mA
Quiescent current: 3.7µA
Package type: SOT-23-5 (SC-74A)
Protection features: Over-current and reverse-current protection
Control features: Enable function
Operating temperature range: -40°C to +85°C
Mounting type: Surface mount
Series designation: RP173x

Parts meeting all these parameters are classified as parametric equivalents and direct substitutes. Variations in RoHS compliance status, moisture sensitivity level classification, or REACH status do not affect electrical or mechanical substitutability.

Parameter Comparison

Parameter	RP173N331D-TR-FE	RP173N331A-TR-FE	Unit
Manufacturer	Nisshinbo Micro Devices Inc.	Nisshinbo Micro Devices Inc.	—
Series	RP173x	RP173x	—
Output Voltage (Fixed)	3.3	3.3	V
Output Current	150	150	mA
Input Voltage (Maximum)	11	11	V
Dropout Voltage (Maximum)	1.05	1.05	V @ 150mA
Quiescent Current	3.7	3.7	µA
Operating Temperature Range	-40 to +85	-40 to +85	°C
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	—
Supplier Device Package	SOT-23-5	SOT-23-5	—
Mounting Type	Surface Mount	Surface Mount	—
Output Configuration	Positive	Positive	—
Output Type	Fixed	Fixed	—
Number of Regulators	1	1	—
Protection Features	Over-Current, Reverse-Current	Over-Current, Reverse-Current	—
Control Features	Enable	Enable	—
Product Status	Active	Active	—
ECCN	EAR99	EAR99	—
HTSUS	8542.39.0001	8542.39.0001	—

Engineering Selection Recommendations

Both the RP173N331D-TR-FE and RP173N331A-TR-FE are active production devices from Nisshinbo Micro Devices Inc. and are classified as parametric equivalents. Selection between these parts is based on compliance and regulatory requirements:

RP173N331D-TR-FE carries RoHS Compliant certification and is suitable for applications requiring standard RoHS compliance.

RP173N331A-TR-FE carries ROHS3 Compliant certification and REACH Unaffected status, providing enhanced regulatory coverage for applications subject to stricter environmental and chemical restriction requirements.

Both parts are classified as Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.

Selection should be based on the specific regulatory and compliance requirements of the end application. Electrical performance, thermal characteristics, and mechanical compatibility are identical between the two parts.

Frequently Asked Questions (FAQ)

Q: Can RP173N331A-TR-FE be used as a direct replacement for RP173N331D-TR-FE?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, output voltage, current capacity, dropout voltage, quiescent current, operating temperature range, and SOT-23-5 package configuration. Direct substitution is supported at the circuit board level without design modifications.

Q: What is the difference between these two part numbers?

A: The primary differences are regulatory certifications. RP173N331D-TR-FE carries RoHS Compliant status, while RP173N331A-TR-FE carries ROHS3 Compliant certification and REACH Unaffected status. Electrical and mechanical specifications are identical.

Q: Are there any package or pinout differences?

A: No. Both parts use the SOT-23-5 package (SC-74A, SOT-753) with identical pinout and mechanical dimensions. PCB footprints are interchangeable.

Q: What is the maximum input voltage for this regulator?

A: The maximum input voltage is 11V for both the RP173N331D-TR-FE and RP173N331A-TR-FE.

Q: What is the dropout voltage at full load?

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

Q: Are both parts available in tape and reel packaging?

A: Yes. Both RP173N331D-TR-FE and RP173N331A-TR-FE are supplied in Tape & Reel (TR) packaging suitable for automated assembly processes.

Q: What protection features are integrated into this regulator?

A: Both parts include over-current protection and reverse-current protection. An enable control feature is also integrated.

Q: What is the operating temperature range?

A: Both parts operate across the temperature range of -40°C to +85°C (TA).

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