AP7343D-31FS4-7B Equivalent & Substitute Parts

Part Overview

The AP7343D-31FS4-7B is a linear voltage regulator IC from Diodes Incorporated, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 3.1V at 300mA with a maximum dropout voltage of 0.29V at 300mA. The device is housed in a 4-XDFN Exposed Pad surface mount package and is currently in active production status with 1091 pieces in stock. This part is ROHS3 compliant with MSL 1 (Unlimited) rating.

Equivalent and substitute parts are identified when alternative models maintain compatibility across critical electrical and mechanical parameters while meeting the same functional requirements for 3.1V fixed output regulation at 300mA output current.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP7343D-31FS4-7B
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Description	IC REG LINEAR 3.1V 300MA 4DFN
Output Voltage (Fixed)	3.1V
Output Current	300mA
Input Voltage (Max)	5.25V
Dropout Voltage (Max)	0.29V @ 300mA
Quiescent Current	60 µA
Package / Case	4-XDFN Exposed Pad
Mounting Type	Surface Mount
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the AP7343D-31FS4-7B are identified based on the following critical parameters that determine functional compatibility:

Fixed output voltage of 3.1V
Output current capability of 300mA
Maximum input voltage of 5.25V
Surface mount package type (4-XDFN Exposed Pad)
Positive output configuration with single regulator
Enable control feature and over-current protection
Operating temperature range of -40°C to 85°C
ROHS3 compliance and MSL 1 rating

The three substitute parts listed below maintain these core electrical and mechanical specifications. Variations in dropout voltage and quiescent current are noted but do not prevent functional substitution when the application requirements are met.

Parameter Comparison

Parameter	AP7343D-31FS4-7B	AP7341-31FS4-7	AP7341D-31FS4-7	AP7343-31FS4-7B
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Output Voltage (Fixed)	3.1V	3.1V	3.1V	3.1V
Output Current	300mA	300mA	300mA	300mA
Input Voltage (Max)	5.25V	5.25V	5.25V	5.25V
Dropout Voltage (Max)	0.29V @ 300mA	0.27V @ 150mA	0.65V @ 300mA	0.29V @ 300mA
Quiescent Current	60 µA	50 µA	50 µA	60 µA
PSRR	75dB (1kHz)	75dB (1kHz)	75dB (1kHz)	75dB (1kHz)
Package / Case	4-XDFN Exposed Pad	4-XDFN Exposed Pad	4-XDFN Exposed Pad	4-XDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All four parts—AP7343D-31FS4-7B, AP7341-31FS4-7, AP7341D-31FS4-7, and AP7343-31FS4-7B—are active production components from Diodes Incorporated with ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings. All are suitable for applications requiring a 3.1V fixed output linear regulator at 300mA in a 4-XDFN surface mount package.

The AP7343D-31FS4-7B and AP7343-31FS4-7B are functionally identical with identical dropout voltage specifications (0.29V @ 300mA) and quiescent current (60 µA), differing only in packaging designation. The AP7341-31FS4-7 and AP7341D-31FS4-7 offer lower quiescent current (50 µA) but with different dropout voltage characteristics. Selection should be based on application-specific requirements for dropout voltage performance and quiescent current consumption.

Frequently Asked Questions (FAQ)

Q: Can AP7341-31FS4-7 be used as a direct replacement for AP7343D-31FS4-7B?

A: Yes, from an electrical and mechanical standpoint. Both deliver 3.1V at 300mA in the same 4-XDFN package. The AP7341-31FS4-7 has a lower quiescent current (50 µA vs. 60 µA) but a different dropout voltage specification (0.27V @ 150mA vs. 0.29V @ 300mA). Compatibility depends on whether your application can accommodate these parameter differences.

Q: What is the difference between AP7343D-31FS4-7B and AP7343-31FS4-7B?

A: These parts are electrically and functionally identical. Both have the same output voltage, current rating, dropout voltage, and quiescent current specifications. The difference lies in packaging designation and inventory availability.

Q: Are all substitute parts in the same package?

A: Yes. All four parts use the 4-XDFN Exposed Pad surface mount package with identical pin configurations, allowing direct PCB layout compatibility.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, REACH unaffected status, and EAR99 ECCN classification.

Q: Which substitute part has the lowest quiescent current?

A: AP7341-31FS4-7 and AP7341D-31FS4-7 both have a quiescent current of 50 µA, compared to 60 µA for the AP7343D-31FS4-7B and AP7343-31FS4-7B.

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