RP103N331D-TR-F Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RP103N331D-TR-F 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 dropout voltage of 0.27V at full load current. The device integrates over-current protection and an enable control feature, operating across the industrial temperature range of -40°C to 85°C. The part is supplied in SOT-23-5 surface mount packaging on tape and reel.

Equivalent substitute parts are identified when alternative manufacturers offer linear voltage regulators with matching electrical specifications, identical output voltage and current ratings, compatible package footprints, and equivalent protection features. Substitute parts enable design flexibility, support supply chain continuity, and provide alternative sourcing options for production environments.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	3.3	V
Output Current	150	mA
Input Voltage (Maximum)	5.25	V
Dropout Voltage (Maximum)	0.27	V @ 150mA
Quiescent Current	50	µA
Operating Temperature Range	-40 to 85	°C
Package Type	SOT-23-5	Surface Mount
Control Features	Enable	—
Protection Features	Over Current	—
Output Configuration	Positive	—
Number of Regulators	1	—

Substitute Part Grouping Explanation

Substitute parts for the RP103N331D-TR-F are qualified based on the following electrical and mechanical criteria:

Electrical Matching Parameters:

Fixed output voltage of 3.3V
Output current rating of 150mA
Maximum input voltage of 5.25V
Dropout voltage performance at rated load
Quiescent current characteristics
Enable control functionality
Over-current protection integration
Operating temperature range of -40°C to 85°C

Mechanical Compatibility:

Surface mount packaging in SOT-23-5 or equivalent footprint (SC-74A, SOT-753)
Tape and reel supply format
Pin configuration compatibility

The substitute parts AP7315-33W5-7 and AP7315D-33W5-7, both manufactured by Diodes Incorporated, meet these criteria. Both devices deliver identical output specifications, operate across the same temperature range, include equivalent protection and control features, and are available in compatible surface mount packages. The primary electrical difference is a marginally higher dropout voltage of 0.29V compared to 0.27V in the main part, which remains within acceptable tolerance for most applications requiring 3.3V regulation at 150mA.

Parameter Comparison

Parameter	RP103N331D-TR-F (Nisshinbo)	AP7315-33W5-7 (Diodes)	AP7315D-33W5-7 (Diodes)
Output Voltage (Fixed)	3.3V	3.3V	3.3V
Output Current	150mA	150mA	150mA
Input Voltage (Maximum)	5.25V	5.25V	5.25V
Dropout Voltage (Maximum)	0.27V @ 150mA	0.29V @ 150mA	0.29V @ 150mA
Quiescent Current	50µA	60µA	60µA
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753
Supplier Device Package	SOT-23-5	SOT-25	SOT-25
Control Features	Enable	Enable	Enable
Protection Features	Over Current	Over Current	Over Current
Output Configuration	Positive	Positive	Positive
Number of Regulators	1	1	1
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

All three parts—RP103N331D-TR-F, AP7315-33W5-7, and AP7315D-33W5-7—are active products with current manufacturing status and full availability. Selection between these devices is based on supply chain requirements, inventory position, and application-specific thermal considerations.

RP103N331D-TR-F (Nisshinbo Micro Devices Inc.):

Primary choice when Nisshinbo supply chain is preferred
Lowest dropout voltage specification (0.27V) provides marginal thermal advantage in power-constrained applications
RoHS Compliant certification
97,577 units in current inventory

AP7315-33W5-7 (Diodes Incorporated):

Direct substitute with ROHS3 Compliant certification and REACH Unaffected status
Dropout voltage of 0.29V remains within acceptable operating margins
43,400 units in current inventory
Suitable for applications requiring enhanced regulatory compliance documentation

AP7315D-33W5-7 (Diodes Incorporated):

Functionally equivalent to AP7315-33W5-7 with identical electrical specifications
ROHS3 Compliant and REACH Unaffected
15,200 units in current inventory
Alternative sourcing option within Diodes Incorporated product line

All three parts operate across -40°C to 85°C, include enable control and over-current protection, and are supplied in compatible surface mount packages. The 0.02V difference in dropout voltage between the main part and Diodes substitutes is negligible for most 3.3V regulation applications and does not affect functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can AP7315-33W5-7 or AP7315D-33W5-7 be used as direct replacements for RP103N331D-TR-F?

A: Yes. Both Diodes Incorporated parts are parametric equivalents with matching output voltage (3.3V), output current (150mA), input voltage rating (5.25V maximum), operating temperature range (-40°C to 85°C), and integrated protection features (enable control and over-current protection). The parts are functionally interchangeable in applications requiring 3.3V linear regulation at 150mA.

Q: What is the difference between AP7315-33W5-7 and AP7315D-33W5-7?

A: Both parts are manufactured by Diodes Incorporated and share identical electrical specifications, including 3.3V output, 150mA current rating, 0.29V maximum dropout voltage, and 60µA quiescent current. The primary distinction is inventory availability: AP7315-33W5-7 has 43,400 units in stock, while AP7315D-33W5-7 has 15,200 units. Both are active products with current manufacturing status.

Q: Does the 0.02V difference in dropout voltage between RP103N331D-TR-F (0.27V) and the Diodes substitutes (0.29V) affect circuit performance?

A: The dropout voltage difference is 0.02V at 150mA load current. This represents a minimal thermal impact in most applications. For circuits with input voltages significantly above the 5.25V maximum rating or operating at the thermal limits of the regulator, the lower dropout voltage of the RP103N331D-TR-F may provide marginal advantage. For standard 3.3V regulation applications, both specifications are functionally equivalent.

Q: Are all three parts available in the same package?

A: All three parts use compatible surface mount packages designated as SC-74A or SOT-753. The RP103N331D-TR-F is supplied as SOT-23-5, while the Diodes parts are supplied as SOT-25. Both package designations refer to the same physical footprint and pin configuration, ensuring PCB layout compatibility.

Q: What compliance certifications apply to each part?

A: RP103N331D-TR-F carries RoHS Compliant certification. Both AP7315-33W5-7 and AP7315D-33W5-7 carry ROHS3 Compliant certification and are REACH Unaffected. All three parts have Moisture Sensitivity Level 1 (Unlimited) and are classified under ECCN EAR99 and HTSUS 8542.39.0001.

Q: Can these parts be used interchangeably in production?

A: Yes, provided the application requirements are met. All three parts deliver 3.3V at 150mA with enable control and over-current protection across -40°C to 85°C. Substitution is valid for any design using the RP103N331D-TR-F. Verification of PCB layout compatibility with the SOT-23-5 or SOT-25 package footprint is required before production implementation.

Q: What is the quiescent current difference, and does it matter?

A: The RP103N331D-TR-F has 50µA quiescent current, while both Diodes substitutes have 60µA. The 10µA difference is negligible in most applications. For ultra-low-power designs where quiescent current is critical, the RP103N331D-TR-F offers a marginal advantage. For standard applications, both specifications are acceptable.

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