AP7343D-28FS4-7B Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The AP7343D-28FS4-7B is an active linear voltage regulator IC from Diodes Incorporated, classified as a Power Management (PMIC) component. This positive fixed output regulator delivers 300mA at 2.8V with a maximum dropout voltage of 0.3V at full load current. The device is in active product status and features integrated over-current protection with enable control functionality. Substitute parts are identified to address packaging format availability, inventory constraints, or specific application requirements while maintaining electrical and mechanical compatibility within defined parameter tolerances.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Output Voltage (Fixed)	2.8V
Output Current	300mA
Input Voltage (Max)	5.25V
Dropout Voltage (Max)	0.3V @ 300mA
Quiescent Current	60 µA
PSRR	75dB (1kHz)
Package Type	4-XDFN Exposed Pad (X2-DFN1010-4)
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the AP7343D-28FS4-7B are identified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Electrical Parameters (Must Match):

Output voltage: 2.8V fixed
Output current capability: 300mA
Maximum input voltage: 5.25V
Package/case type: 4-XDFN Exposed Pad
Supplier device package: X2-DFN1010-4
Operating temperature range: -40°C ~ 85°C
Control features: Enable function
Protection features: Over-current protection

Allowable Variations:

Dropout voltage: Tolerance range 0.3V to 0.65V @ 300mA
Quiescent current: Range 50 µA to 60 µA
Packaging format: Cut Tape (CT) or Tape & Reel (TR) formats are interchangeable

Compliance Requirements (Must Match):

RoHS3 compliance
Moisture Sensitivity Level 1
Active product status

Parameter Comparison

Parameter	AP7343D-28FS4-7B (Main)	AP7343-28FS4-7B	AP7341-28FS4-7	AP7341D-28FS4-7
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Output Voltage	2.8V	2.8V	2.8V	2.8V
Output Current	300mA	300mA	300mA	300mA
Input Voltage (Max)	5.25V	5.25V	5.25V	5.25V
Dropout Voltage (Max)	0.3V @ 300mA	0.3V @ 300mA	0.65V @ 300mA	0.65V @ 300mA
Quiescent Current	60 µA	60 µA	50 µA	50 µA
PSRR	75dB (1kHz)	75dB (1kHz)	75dB (1kHz)	75dB (1kHz)
Package Type	4-XDFN Exposed Pad	4-XDFN Exposed Pad	4-XDFN Exposed Pad	4-XDFN Exposed Pad
Packaging Format	Cut Tape (CT)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
Operating Temperature	-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 substitute parts listed maintain active product status with ROHS3 compliance and identical moisture sensitivity classification. Selection between AP7343D-28FS4-7B and AP7343-28FS4-7B is determined by packaging format requirements: Cut Tape for automated pick-and-place operations or Tape & Reel for high-volume production runs.

The AP7341-28FS4-7 and AP7341D-28FS4-7 variants are electrically compatible substitutes with allowable parameter variations in dropout voltage (0.65V maximum versus 0.3V) and quiescent current (50 µA versus 60 µA). These variants are suitable for applications where the higher dropout voltage and lower quiescent current do not present design constraints. Packaging format selection between AP7341-28FS4-7 (Tape & Reel) and AP7341D-28FS4-7 (Tape & Reel) follows standard procurement practices.

Frequently Asked Questions (FAQ)

Q: Can AP7343-28FS4-7B replace AP7343D-28FS4-7B directly?

A: Yes. Both parts are electrically identical with matching dropout voltage (0.3V @ 300mA) and quiescent current (60 µA). The difference is packaging format: AP7343D-28FS4-7B is supplied in Cut Tape, while AP7343-28FS4-7B is supplied in Tape & Reel. Selection depends on assembly equipment compatibility.

Q: What is the difference between AP7343 and AP7341 series?

A: Both series deliver 2.8V at 300mA in the same 4-XDFN package. The AP7343 series has lower dropout voltage (0.3V @ 300mA) and higher quiescent current (60 µA). The AP7341 series has higher dropout voltage (0.65V @ 300mA) and lower quiescent current (50 µA). Selection depends on power budget and input voltage margin requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (unlimited shelf life).

Q: Can I use AP7341D-28FS4-7 in place of AP7343D-28FS4-7B?

A: Substitution is valid if the application tolerates 0.65V dropout voltage (versus 0.3V) and benefits from 50 µA quiescent current (versus 60 µA). Verify that input voltage margin remains adequate with the higher dropout specification.

Q: What does the packaging designation mean?

A: X2-DFN1010-4 is the supplier device package designation for a 4-pin DFN (Dual Flat No-Lead) package with exposed pad. Cut Tape (CT) and Tape & Reel (TR) refer to the physical delivery format for assembly operations, not the component itself.

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