AP7340D-18FS4-7 Equivalent & Substitute Parts

Part Overview

The AP7340D-18FS4-7 is a linear voltage regulator IC manufactured by Diodes Incorporated, delivering a fixed 1.8V output at 150mA. This Surface Mount device operates across -40°C to 85°C and includes Enable control and Over Current protection features. The part is Active status and ROHS3 compliant with unlimited moisture sensitivity rating.

Substitute parts are necessary when the original part experiences supply constraints, extended lead times, or when design requirements demand enhanced performance characteristics such as higher output current capacity, improved dropout voltage, or extended operating temperature ranges.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP7340D-18FS4-7
Manufacturer	Diodes Incorporated
Output Voltage (Fixed)	1.8V
Output Current	150mA
Input Voltage (Max)	5.25V
Dropout Voltage (Max)	0.42V @ 150mA
Quiescent Current	50 µA
Package / Case	4-XDFN Exposed Pad
Operating Temperature	-40°C ~ 85°C
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Substitution Criteria:

Fixed output voltage of 1.8V
Output current rating equal to or greater than 150mA
Input voltage maximum of 5.25V or higher
Surface Mount packaging with 4-pin configuration
Operating temperature range of -40°C to 85°C minimum
Active product status or equivalent availability
ROHS3 compliance

Secondary Compatibility Factors:

Dropout voltage performance
Quiescent current characteristics
Protection features (Over Current, Over Temperature)
Package footprint compatibility (4-XDFN, 4-UDFN, 4-SSON variants)

Parts are grouped by output current capability: direct equivalents (150mA), enhanced capacity substitutes (200-300mA), and high-current alternatives (450-500mA).

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Operating Temp	Product Status
AP7340D-18FS4-7	Diodes Incorporated	150mA	5.25V	0.42V @ 150mA	50 µA	4-XDFN	-40°C ~ 85°C	Active
AP7340-18FS4-7	Diodes Incorporated	150mA	5.25V	0.42V @ 150mA	50 µA	4-XDFN	-40°C ~ 85°C	Active
BU18TD2WNVX-TL	Rohm Semiconductor	200mA	6V	0.6V @ 200mA	60 µA	4-UDFN	-40°C ~ 85°C	Active
BU18UA3WNVX-TL	Rohm Semiconductor	300mA	5.5V	0.32V @ 300mA	90 µA	4-UDFN	-40°C ~ 85°C	Not For New Designs
MCP1711T-18I/5X	Microchip Technology	150mA	6V	1.4V @ 150mA	1.27 µA	4-UDFN	-40°C ~ 85°C	Active
NCP161AMX180TBG	onsemi	450mA	5.5V	0.45V @ 450mA	23 µA	4-XDFN	-40°C ~ 125°C	Active
NCP161BMX180TBG	onsemi	450mA	5.5V	0.45V @ 450mA	23 µA	4-XDFN	-40°C ~ 125°C	Active
NCP177AMX180TCG	onsemi	500mA	5.5V	0.285V @ 500mA	90 µA	4-XDFN	-40°C ~ 85°C	Active
NCP177BMX180TCG	onsemi	500mA	5.5V	0.285V @ 500mA	90 µA	4-XDFN	-40°C ~ 85°C	Active

Engineering Selection Recommendations

Direct Parametric Equivalent: AP7340-18FS4-7 (Diodes Incorporated) provides identical electrical and mechanical specifications to the main part with Active product status and equivalent inventory availability.

Active Status Substitutes with Enhanced Current Capacity: NCP177AMX180TCG and NCP177BMX180TCG (onsemi) deliver 500mA output current with improved dropout voltage (0.285V @ 500mA) and maintain 4-XDFN package compatibility. Both parts are Active status with ROHS3 compliance.

NCP161AMX180TBG and NCP161BMX180TBG (onsemi) provide 450mA output current with extended operating temperature to 125°C and Active product status. Package compatibility is maintained at 4-XDFN.

Intermediate Current Capacity: BU18TD2WNVX-TL (Rohm Semiconductor) offers 200mA output current with Active status and 4-UDFN package configuration. Input voltage maximum extends to 6V.

Low Quiescent Current Alternative: MCP1711T-18I/5X (Microchip Technology) delivers 150mA with exceptionally low quiescent current (1.27 µA) and Active status. Higher dropout voltage (1.4V @ 150mA) requires circuit evaluation.

Obsolescence Consideration: BU18UA3WNVX-TL (Rohm Semiconductor) carries "Not For New Designs" status despite 300mA capacity and superior dropout voltage (0.32V @ 300mA). This part is suitable only for legacy design maintenance.

Frequently Asked Questions (FAQ)

Q: Can NCP177AMX180TCG replace AP7340D-18FS4-7 directly? A: Yes. NCP177AMX180TCG meets all primary substitution criteria with identical 1.8V output, exceeds the 150mA current requirement at 500mA, maintains 4-XDFN package compatibility, and holds Active product status with ROHS3 compliance. The improved dropout voltage (0.285V vs 0.42V) provides additional design margin.

Q: What is the difference between NCP161AMX180TBG and NCP161BMX180TBG? A: Both parts are electrically and mechanically identical with 450mA output current, 0.45V dropout voltage, and 4-XDFN packaging. Designation differences reflect manufacturing variants with equivalent performance characteristics.

Q: Why does MCP1711T-18I/5X have higher dropout voltage? A: MCP1711T-18I/5X is specified at 1.4V dropout voltage @ 150mA, compared to 0.42V for AP7340D-18FS4-7. This characteristic is inherent to the Microchip design and requires verification that input voltage headroom accommodates the higher dropout in the target application.

Q: Is BU18UA3WNVX-TL suitable for new designs? A: BU18UA3WNVX-TL carries "Not For New Designs" product status. This part is restricted to legacy design support and maintenance applications only. Active alternatives such as NCP177AMX180TCG or NCP161AMX180TBG are recommended for new designs.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the environmental and regulatory requirements of the main part.

Q: What package compatibility considerations apply? A: AP7340D-18FS4-7 uses 4-XDFN packaging. Substitute parts employ 4-XDFN, 4-UDFN, or 4-SSON variants. While all are 4-pin Surface Mount packages with exposed pads, PCB footprint verification is required when transitioning between package types, particularly between XDFN and UDFN/SSON configurations.

Q: Can higher current-rated parts be used in place of 150mA requirement? A: Yes. Parts rated for 200mA, 300mA, 450mA, or 500mA output current are backward-compatible with 150mA load requirements. The regulator will operate within specification at reduced load current. Quiescent current and thermal dissipation characteristics remain as specified.

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