AP7341-18FS4-7 Equivalent & Substitute Parts

Part Overview

The AP7341-18FS4-7 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed for positive fixed 1.8V output applications with 300mA current capacity. This Surface Mount device in 4-XDFN Exposed Pad package operates across -40°C to 85°C temperature range and includes Enable control and Over Current protection features. The part is Active status and ROHS3 compliant. Substitute parts are necessary when addressing inventory constraints, packaging format requirements, or performance parameter optimization for specific application demands.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	AP7341-18FS4-7
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.8V
Output Current	300mA
Input Voltage (Max)	5.25V
Dropout Voltage (Max)	0.65V @ 300mA
Quiescent Current	50 µA
PSRR	75dB (1kHz)
Package	4-XDFN Exposed Pad
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Control Features	Enable
Protection Features	Over Current
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters: Output Voltage (1.8V fixed), Output Current capacity, Input Voltage maximum rating, Dropout Voltage performance, Package type (4-XDFN or compatible), Mounting type (Surface Mount), Operating Temperature range, and regulatory compliance (ROHS3). Substitute parts are grouped into three categories based on substitution relationship type: Parametric Equivalents (identical electrical and mechanical specifications with different packaging or inventory status), Manufacturer Recommended alternatives (functionally compatible with minor parameter variations), and cross-manufacturer options (different manufacturers with equivalent performance characteristics).

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Operating Temp	Product Status
AP7341-18FS4-7	Diodes Incorporated	300mA	5.25V	0.65V @ 300mA	50 µA	4-XDFN Exposed Pad	-40°C ~ 85°C	Active
AP7341D-18FS4-7	Diodes Incorporated	300mA	5.25V	0.65V @ 300mA	50 µA	4-XDFN Exposed Pad	-40°C ~ 85°C	Active
AP7343-18FS4-7B	Diodes Incorporated	300mA	5.25V	0.39V @ 300mA	60 µA	4-XDFN Exposed Pad	-40°C ~ 85°C	Active
AP7343D-18FS4-7B	Diodes Incorporated	300mA	5.25V	0.39V @ 300mA	60 µA	4-XDFN Exposed Pad	-40°C ~ 85°C	Active
BU18TD2WNVX-TL	Rohm Semiconductor	200mA	6V	0.6V @ 200mA	60 µA	4-UDFN Exposed Pad	-40°C ~ 85°C	Active
BU18UA3WNVX-TL	Rohm Semiconductor	300mA	5.5V	0.32V @ 300mA	90 µA	4-UDFN Exposed Pad	-40°C ~ 85°C	Not For New Designs
NCP160AMX180TBG	onsemi	250mA	5.5V	0.25V @ 250mA	23 µA	4-XDFN Exposed Pad	-40°C ~ 125°C	Active
NCP161AMX180TBG	onsemi	450mA	5.5V	0.45V @ 450mA	23 µA	4-XDFN Exposed Pad	-40°C ~ 125°C	Active
NCP161BMX180TBG	onsemi	450mA	5.5V	0.45V @ 450mA	23 µA	4-XDFN Exposed Pad	-40°C ~ 125°C	Active
NCP177AMX180TCG	onsemi	500mA	5.5V	0.285V @ 500mA	90 µA	4-XDFN Exposed Pad	-40°C ~ 85°C	Active
NCP177BMX180TCG	onsemi	500mA	5.5V	0.285V @ 500mA	90 µA	4-XDFN Exposed Pad	-40°C ~ 85°C	Active

Engineering Selection Recommendations

Parametric Equivalents (Direct Substitutes): AP7341D-18FS4-7 provides identical electrical specifications and package format with higher inventory availability (63,200 units). AP7343-18FS4-7B and AP7343D-18FS4-7B offer improved dropout voltage performance (0.39V vs 0.65V) while maintaining 300mA output current and identical package specifications. Both AP7343 variants are Active status products suitable for new designs.

Manufacturer Recommended Alternatives: BU18UA3WNVX-TL (Rohm Semiconductor) matches the 300mA output current and 1.8V fixed output with superior dropout voltage (0.32V) but carries "Not For New Designs" status and uses 4-UDFN package variant. BU18TD2WNVX-TL provides lower output current (200mA) with higher input voltage rating (6V) and is Active status. NCP160AMX180TBG (onsemi) delivers 250mA output with extended operating temperature range (-40°C to 125°C) and lower quiescent current (23 µA).

Higher Current Capacity Options: NCP161AMX180TBG and NCP161BMX180TBG (onsemi) provide 450mA output current with extended temperature range and lower quiescent current (23 µA), suitable for applications requiring higher current delivery. NCP177AMX180TCG and NCP177BMX180TCG (onsemi) deliver 500mA output current with superior dropout voltage (0.285V) and extended temperature range, appropriate for power-sensitive applications.

Compliance and Status: All recommended Active status parts maintain ROHS3 compliance and REACH unaffected status. BU18UA3WNVX-TL is excluded from new design consideration due to "Not For New Designs" product status.

Frequently Asked Questions (FAQ)

Q: Can AP7341D-18FS4-7 directly replace AP7341-18FS4-7? A: Yes. AP7341D-18FS4-7 is a parametric equivalent with identical electrical specifications (1.8V output, 300mA current, 0.65V dropout voltage), package format (4-XDFN Exposed Pad), and operating temperature range (-40°C to 85°C). The primary difference is higher inventory availability.

Q: What is the advantage of AP7343-18FS4-7B over the original AP7341-18FS4-7? A: AP7343-18FS4-7B maintains identical 300mA output current and package specifications but reduces dropout voltage from 0.65V to 0.39V, resulting in lower power dissipation and improved efficiency in applications with tight input voltage margins.

Q: Are onsemi NCP160/NCP161/NCP177 series compatible with AP7341-18FS4-7? A: Compatibility depends on application current requirements. NCP160AMX180TBG supports 250mA (below AP7341 300mA rating). NCP161 series supports 450mA (above AP7341 rating). NCP177 series supports 500mA. All maintain 1.8V fixed output and 4-XDFN package format. Extended operating temperature range (-40°C to 125°C) on onsemi parts provides additional thermal margin.

Q: Why is BU18UA3WNVX-TL marked "Not For New Designs"? A: BU18UA3WNVX-TL carries "Not For New Designs" product status, indicating the manufacturer recommends against using this part in new circuit designs. While functionally compatible with 300mA output and 1.8V fixed voltage, Active status alternatives (AP7341D-18FS4-7, AP7343-18FS4-7B, NCP161 series) are preferred for new applications.

Q: What package differences exist between substitute parts? A: AP7341-18FS4-7 and all onsemi NCP series use 4-XDFN Exposed Pad package. Rohm Semiconductor BU18 series use 4-UDFN Exposed Pad package. Both are 4-pin surface mount packages with exposed thermal pads in 1x1mm footprint, with minor pinout compatibility requiring schematic verification.

Q: Which substitute offers the lowest dropout voltage? A: NCP177AMX180TCG and NCP177BMX180TCG deliver 0.285V dropout voltage at 500mA, the lowest among all listed substitutes. This reduces power dissipation and heat generation in applications with marginal input voltage headroom.

Q: Can I use NCP161 series (450mA) in place of AP7341-18FS4-7 (300mA)? A: Yes, from an electrical standpoint. NCP161 series provides higher current capacity (450mA) with identical 1.8V output, 4-XDFN package, and Active status. However, verify PCB layout and thermal design accommodate the higher current capability and ensure input voltage supply can support the increased load.

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