AP7340-185FS4-7 Equivalent & Substitute Parts

Part Overview

The AP7340-185FS4-7 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 1.85V output voltage with a maximum dropout voltage of 0.42V at rated current. The part is classified as Active product status and is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges for this power management application.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.85V
Output Current	150mA
Input Voltage (Max)	5.25V
Dropout Voltage (Max)	0.42V @ 150mA
Quiescent Current	50 µA
PSRR	75dB (1kHz)
Operating Temperature Range	-40°C ~ 85°C
Package Type	4-XDFN Exposed Pad (X2-DFN1010-4)
Control Features	Enable
Protection Features	Over Current

Substitute Part Grouping Explanation

Substitute parts for the AP7340-185FS4-7 are classified based on electrical parameter compatibility and mechanical mounting requirements. The primary substitution criteria are:

Critical Parameters for Substitution:

Fixed output voltage of 1.85V
Output current capability of 150mA or greater
Maximum input voltage of 5.25V or higher
Surface Mount package with compatible pinout
Operating temperature range of -40°C to 85°C
Enable control feature
Over Current protection

Parametric Equivalent: AP7340D-185FS4-7 maintains identical electrical specifications and package configuration, differing only in die revision designation.

Manufacturer Recommended Substitute: BU1JUA3WNVX-TL from ROHM Semiconductor provides enhanced output current capability (300mA) and improved dropout voltage performance (0.32V @ 300mA), with additional Over Temperature protection. This part is suitable for applications requiring higher current headroom while maintaining the 1.85V fixed output voltage.

Parameter Comparison

Parameter	AP7340-185FS4-7	AP7340D-185FS4-7	BU1JUA3WNVX-TL
Manufacturer	Diodes Incorporated	Diodes Incorporated	ROHM Semiconductor
Output Voltage (Fixed)	1.85V	1.85V	1.85V
Output Current	150mA	150mA	300mA
Input Voltage (Max)	5.25V	5.25V	5.5V
Dropout Voltage (Max)	0.42V @ 150mA	0.42V @ 150mA	0.32V @ 300mA
Quiescent Current	50 µA	50 µA	90 µA
PSRR	75dB (1kHz)	75dB (1kHz)	70dB (1kHz)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	4-XDFN Exposed Pad	4-XDFN Exposed Pad	4-UDFN Exposed Pad
Control Features	Enable	Enable	Enable
Protection Features	Over Current	Over Current	Over Current, Over Temperature
Product Status	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AP7340D-185FS4-7: This part is recommended as the primary substitute for direct replacement applications. It maintains Active product status, identical electrical specifications, and the same package configuration. Selection of this part ensures continuity in design and manufacturing processes with no circuit modifications required.

BU1JUA3WNVX-TL: This part carries Not For New Designs status and should be selected only when existing inventory constraints or legacy system requirements necessitate its use. While it provides superior output current capability and lower dropout voltage, the product status designation indicates manufacturer discontinuation planning. The package type differs (4-UDFN vs. 4-XDFN), requiring PCB layout verification for mechanical compatibility. The increased quiescent current (90 µA vs. 50 µA) may impact power consumption in battery-powered applications.

All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can AP7340D-185FS4-7 be used as a direct replacement for AP7340-185FS4-7?

A: Yes. AP7340D-185FS4-7 is a parametric equivalent with identical electrical specifications and package configuration. No circuit modifications are required for substitution.

Q: What are the key differences between AP7340-185FS4-7 and BU1JUA3WNVX-TL?

A: BU1JUA3WNVX-TL provides doubled output current capability (300mA vs. 150mA), lower dropout voltage (0.32V vs. 0.42V), and additional Over Temperature protection. However, it uses a different package type (4-UDFN vs. 4-XDFN), carries Not For New Designs status, and has higher quiescent current (90 µA vs. 50 µA).

Q: Are the packages for AP7340-185FS4-7 and BU1JUA3WNVX-TL mechanically compatible?

A: No. AP7340-185FS4-7 uses 4-XDFN Exposed Pad (X2-DFN1010-4) while BU1JUA3WNVX-TL uses 4-UDFN Exposed Pad (SSON004X1010). PCB layout and footprint verification is required before substitution.

Q: Why is BU1JUA3WNVX-TL marked as Not For New Designs?

A: This designation indicates the manufacturer has planned discontinuation of this product line. It should be used only in legacy system maintenance or when existing inventory availability requires its selection.

Q: Do all substitute parts maintain the same compliance certifications?

A: Yes. AP7340D-185FS4-7 and BU1JUA3WNVX-TL are both ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part specifications.

Q: What is the impact of increased quiescent current in BU1JUA3WNVX-TL?

A: The quiescent current increase from 50 µA to 90 µA results in 40 µA additional standby power consumption. In battery-powered or low-power applications, this may require circuit design evaluation.

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