AP7341-185FS4-7 Equivalent & Substitute Parts

Part Overview

The AP7341-185FS4-7 is a linear voltage regulator IC from Diodes Incorporated, delivering a fixed 1.85V output at 300mA in a compact 4-XDFN surface mount package. This device is actively produced and widely used in power management applications requiring low-dropout regulation with integrated enable control and overcurrent protection. Substitute parts are identified based on matching output voltage, current capacity, package compatibility, and electrical performance parameters within acceptable operating ranges.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	AP7341-185FS4-7
Output Voltage (Fixed)	1.85V
Output Current	300mA
Input Voltage (Max)	5.25V
Dropout Voltage (Max)	0.42V @ 150mA
Quiescent Current	50 µA
PSRR	75dB (1kHz)
Package	4-XDFN Exposed Pad (X2-DFN1010-4)
Operating Temperature	-40°C ~ 85°C
Product Status	Active
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AP7341-185FS4-7 are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical electrical specifications and package form factor. These parts are direct replacements with no design modifications required.

Manufacturer Recommended Alternatives provide functionally equivalent regulation at 1.8V output with variations in current capacity, dropout voltage, or quiescent current. These parts are suitable when the application can accommodate the specified parameter differences.

Substitution eligibility is determined by the following criteria:

Output voltage tolerance (1.8V to 1.85V fixed output)
Output current capacity (minimum 300mA for direct replacement; lower ratings for reduced-load applications)
Maximum input voltage (5.25V to 6V range)
Package compatibility (4-XDFN or equivalent surface mount form factor)
Control features (Enable function required)
Protection features (Overcurrent protection minimum requirement)
Operating temperature range (-40°C to 85°C minimum)
Compliance certifications (ROHS3, REACH Unaffected, EAR99)

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Operating Temp	Product Status
AP7341-185FS4-7	Diodes Incorporated	1.85V	300mA	5.25V	0.42V @ 150mA	50 µA	4-XDFN	-40°C ~ 85°C	Active
AP7341D-185FS4-7	Diodes Incorporated	1.85V	300mA	5.25V	0.42V @ 150mA	50 µA	4-XDFN	-40°C ~ 85°C	Active
BU18TD2WNVX-TL	Rohm Semiconductor	1.8V	200mA	6V	0.6V @ 200mA	60 µA	4-UDFN	-40°C ~ 85°C	Active
BU18UA3WNVX-TL	Rohm Semiconductor	1.8V	300mA	5.5V	0.32V @ 300mA	90 µA	4-UDFN	-40°C ~ 85°C	Not For New Designs
NCP160AMX180TBG	onsemi	1.8V	250mA	5.5V	0.25V @ 250mA	23 µA	4-XDFN	-40°C ~ 125°C	Active
NCP161AMX180TBG	onsemi	1.8V	450mA	5.5V	0.45V @ 450mA	23 µA	4-XDFN	-40°C ~ 125°C	Active
NCP161BMX180TBG	onsemi	1.8V	450mA	5.5V	0.45V @ 450mA	23 µA	4-XDFN	-40°C ~ 125°C	Active
NCP177AMX180TCG	onsemi	1.8V	500mA	5.5V	0.285V @ 500mA	90 µA	4-XDFN	-40°C ~ 85°C	Active
NCP177BMX180TCG	onsemi	1.8V	500mA	5.5V	0.285V @ 500mA	90 µA	4-XDFN	-40°C ~ 85°C	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent): AP7341D-185FS4-7 is a parametric equivalent with identical electrical specifications and package form factor. This part is suitable for direct substitution without circuit modifications.

Active Status Preference: All recommended alternatives except BU18UA3WNVX-TL carry Active product status. BU18UA3WNVX-TL is marked "Not For New Designs" and should be avoided for new applications.

Package Compatibility: AP7341-185FS4-7 uses 4-XDFN package. onsemi NCP160/NCP161/NCP177 series maintain identical 4-XDFN form factor. Rohm BU18 series use 4-UDFN package, which differs in physical dimensions and may require PCB layout verification.

Current Capacity Matching: For applications requiring exactly 300mA output current, AP7341D-185FS4-7, BU18UA3WNVX-TL, and NCP161 series provide matching capacity. NCP160AMX180TBG (250mA) and BU18TD2WNVX-TL (200mA) are suitable only for reduced-load applications. NCP177 series (500mA) accommodates higher current demands.

Compliance Certification: All listed parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 classification, meeting standard regulatory requirements for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can AP7341D-185FS4-7 replace AP7341-185FS4-7 without any circuit changes? A: Yes. AP7341D-185FS4-7 is a parametric equivalent with identical output voltage (1.85V), current rating (300mA), package (4-XDFN), and electrical characteristics. No design modifications are required.

Q: What is the difference between 4-XDFN and 4-UDFN packages? A: Both are 4-pin surface mount packages with exposed pads, but differ in physical dimensions. 4-XDFN (1x1mm) and 4-UDFN (1x1mm) have similar footprints but may have slight variations in pad layout. PCB design files should be verified before substituting between these package types.

Q: Can NCP177AMX180TCG or NCP177BMX180TCG be used as direct replacements? A: These parts are functionally compatible but not direct replacements. They provide higher output current (500mA vs. 300mA) and lower dropout voltage (0.285V vs. 0.42V), making them suitable for applications requiring improved performance. Output voltage (1.8V) differs slightly from the original (1.85V), which may affect voltage-sensitive circuits.

Q: Why is BU18UA3WNVX-TL marked "Not For New Designs"? A: This designation indicates the manufacturer is discontinuing the product line. While functionally compatible, it should not be selected for new designs due to long-term availability concerns.

Q: What are the key parameters that determine substitution eligibility? A: Output voltage (1.8V to 1.85V), output current capacity (minimum 300mA for direct replacement), maximum input voltage (5.25V to 6V), package form factor (4-XDFN or 4-UDFN), control features (Enable function), protection features (Overcurrent protection), operating temperature range (-40°C to 85°C minimum), and compliance certifications (ROHS3, REACH Unaffected).

Q: Are all substitute parts available in the same tape and reel packaging? A: Yes. All listed parts are supplied in Tape & Reel (TR) packaging suitable for automated assembly processes.

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