AP7340-28FS4-7 Equivalent & Substitute Parts

Part Overview

The AP7340-28FS4-7 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed for positive fixed output applications. This Surface Mount device delivers 150mA output current at a fixed 2.8V output voltage with a maximum dropout voltage of 0.27V at rated load. The part is Active status and ROHS3 compliant, making it suitable for modern electronic applications requiring regulated power delivery in compact form factors.

Substitute parts are identified when design requirements change, inventory constraints occur, or performance improvements are needed while maintaining functional compatibility within the specified electrical and mechanical parameters.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	AP7340-28FS4-7
Category	Power Management (PMIC)
Output Voltage (Fixed)	2.8V
Output Current	150mA
Input Voltage (Max)	5.25V
Dropout Voltage (Max)	0.27V @ 150mA
Package / Case	4-XDFN Exposed Pad
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AP7340-28FS4-7 are classified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Output voltage: 2.8V fixed
Output configuration: Positive
Mounting type: Surface Mount
Control features: Enable function
Protection features: Over Current protection minimum
Compliance: ROHS3 Compliant, REACH Unaffected

Substitution Categories:

Parametric Equivalent: Parts maintaining identical electrical specifications and package form factor. The AP7340D-28FS4-7 qualifies as a direct parametric equivalent, sharing all core electrical parameters and the same X2-DFN1010-4 package.

Performance-Enhanced Substitutes: Parts exceeding the original specifications in output current capacity, dropout voltage performance, or temperature range while maintaining 2.8V fixed output and Surface Mount compatibility. The NCP161AMX280TBG and NCP161BMX280TBG from onsemi provide 450mA output current versus the original 150mA, with improved dropout voltage of 0.29V @ 450mA and extended operating temperature to 125°C.

Alternative Manufacturer Substitute: The BU28TD2WNVX-TL from Rohm Semiconductor provides 200mA output current with 0.5V dropout voltage at rated load, representing a mid-range alternative with enhanced over-temperature protection.

Parameter Comparison

Parameter	AP7340-28FS4-7	AP7340D-28FS4-7	BU28TD2WNVX-TL	NCP161AMX280TBG	NCP161BMX280TBG
Manufacturer	Diodes Inc.	Diodes Inc.	Rohm Semi.	onsemi	onsemi
Output Voltage	2.8V	2.8V	2.8V	2.8V	2.8V
Output Current	150mA	150mA	200mA	450mA	450mA
Input Voltage (Max)	5.25V	5.25V	6V	5.5V	5.5V
Dropout Voltage (Max)	0.27V @ 150mA	0.27V @ 150mA	0.5V @ 200mA	0.29V @ 450mA	0.29V @ 450mA
Quiescent Current	50 µA	50 µA	60 µA	23 µA	23 µA
PSRR	75dB (1kHz)	75dB (1kHz)	70dB (1kHz)	91dB ~ 48dB (100Hz ~ 100kHz)	91dB ~ 48dB (100Hz ~ 100kHz)
Control Features	Enable	Enable	Enable	Enable	Enable
Protection Features	Over Current	Over Current	Over Current, Over Temperature	Over Current, Over Temperature, Soft Start	Over Current, Over Temperature, Soft Start
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	4-XDFN Exposed Pad	4-XDFN Exposed Pad	4-UDFN Exposed Pad	4-XDFN Exposed Pad	4-XDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent): The AP7340D-28FS4-7 provides identical electrical performance and package compatibility. Both parts are Active status, ROHS3 compliant, and maintain the same X2-DFN1010-4 supplier device package. Selection between AP7340-28FS4-7 and AP7340D-28FS4-7 is determined by inventory availability and procurement lead times.

Performance-Enhanced Substitution: The NCP161AMX280TBG and NCP161BMX280TBG deliver 450mA output current capacity, representing a 3x increase over the original 150mA specification. Both onsemi parts maintain 2.8V fixed output, 4-XDFN package compatibility, and extend operating temperature range to 125°C. These parts are suitable for applications requiring higher load current or extended thermal operating margins. Both are Active status and ROHS3 compliant.

Alternative Manufacturer Option: The BU28TD2WNVX-TL from Rohm Semiconductor provides 200mA output current with integrated over-temperature protection. This part operates at 6V maximum input voltage and features a 4-UDFN package variant. Selection is appropriate when higher current capacity than the original 150mA is required but 450mA exceeds application needs. Active status and ROHS3 compliant.

All substitute parts maintain Surface Mount compatibility, Enable control functionality, and minimum Over Current protection required for safe operation.

Frequently Asked Questions (FAQ)

Q: Can the AP7340D-28FS4-7 be used as a direct replacement for the AP7340-28FS4-7?

A: Yes. The AP7340D-28FS4-7 is a parametric equivalent with identical output voltage (2.8V), output current (150mA), dropout voltage (0.27V @ 150mA), and package form factor (X2-DFN1010-4). Both parts are manufactured by Diodes Incorporated and maintain Active product status.

Q: What is the primary difference between the NCP161AMX280TBG and the original AP7340-28FS4-7?

A: The NCP161AMX280TBG provides 450mA output current capacity compared to 150mA in the AP7340-28FS4-7, while maintaining the same 2.8V fixed output voltage. The onsemi part also features lower quiescent current (23 µA vs. 50 µA), higher PSRR performance, and extended operating temperature to 125°C. Both use 4-XDFN packages and are Surface Mount compatible.

Q: Is the BU28TD2WNVX-TL package compatible with the original AP7340-28FS4-7 PCB layout?

A: The BU28TD2WNVX-TL uses a 4-UDFN package (SSON004X1010) versus the original 4-XDFN package (X2-DFN1010-4). While both are 4-pin Surface Mount packages with exposed pads, physical dimensions and pad layouts differ. PCB layout verification is required before substitution.

Q: Which substitute part should be selected for applications requiring maximum current capacity?

A: The NCP161AMX280TBG and NCP161BMX280TBG both provide 450mA output current, the highest among available substitutes. Both are onsemi products with identical electrical specifications and 4-XDFN package compatibility with the original part.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed—AP7340D-28FS4-7, BU28TD2WNVX-TL, NCP161AMX280TBG, and NCP161BMX280TBG—are ROHS3 compliant and REACH unaffected, matching the compliance status of the original AP7340-28FS4-7.

Q: What is the key difference between NCP161AMX280TBG and NCP161BMX280TBG?

A: Both parts are functionally identical with 450mA output current, 2.8V fixed output, and 4-XDFN package compatibility. The primary difference is inventory availability. Selection is determined by procurement requirements and lead time constraints.

Q: Can the BU28TD2WNVX-TL be used in applications originally designed for the AP7340-28FS4-7?

A: The BU28TD2WNVX-TL provides 200mA output current and 0.5V dropout voltage at rated load, both exceeding the original 150mA and 0.27V specifications. However, the 4-UDFN package differs from the original 4-XDFN package, requiring PCB layout verification. The part is suitable for applications where higher current capacity is beneficial and package footprint changes are acceptable.

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