AP7343D-33FS4-7B Equivalent & Substitute Parts

Part Overview

The AP7343D-33FS4-7B is a linear voltage regulator IC from Diodes Incorporated, classified as a Power Management (PMIC) component. This device delivers a fixed 3.3V output at 300mA with a maximum dropout voltage of 0.29V at rated current. The part is actively produced and widely stocked (61,325 pcs available), making it suitable for applications requiring stable low-dropout regulation in compact surface-mount packages. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and regulatory compliance to support design flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP7343D-33FS4-7B
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Output Voltage (Fixed)	3.3V
Output Current	300mA
Dropout Voltage (Max)	0.29V @ 300mA
Input Voltage (Max)	5.25V
Quiescent Current	60 µA
Package / Case	4-XDFN Exposed Pad
Mounting Type	Surface Mount
Operating Temperature Range	-40°C ~ 85°C
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AP7343D-33FS4-7B are identified based on the following critical parameters that determine functional equivalence:

Output Voltage (Fixed): 3.3V (all substitutes match)
Output Current: 300mA (all substitutes match)
Package / Case: 4-XDFN Exposed Pad (all substitutes match)
Mounting Type: Surface Mount (all substitutes match)
Input Voltage (Max): 5.25V (all substitutes match)
Operating Temperature Range: -40°C ~ 85°C (all substitutes match)
Control Features: Enable (all substitutes match)
Protection Features: Over Current (all substitutes match)
RoHS Status: ROHS3 Compliant (all substitutes match)

Substitutes are grouped into two categories based on dropout voltage performance:

Category A (Lower Dropout): AP7343-33FS4-7B and AP7343D-33FS4-7B share identical dropout specifications (0.29V @ 300mA) and quiescent current (60 µA), providing direct functional equivalence.

Category B (Higher Dropout): AP7341-33FS4-7 and AP7341D-33FS4-7 feature a higher maximum dropout voltage of 0.65V @ 300mA and lower quiescent current of 50 µA. These parts remain functionally compatible within the same electrical and mechanical constraints but exhibit different performance characteristics in low-input-voltage applications.

Parameter Comparison

Parameter	AP7343D-33FS4-7B (Main)	AP7343-33FS4-7B	AP7341-33FS4-7	AP7341D-33FS4-7
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Output Voltage (Fixed)	3.3V	3.3V	3.3V	3.3V
Output Current	300mA	300mA	300mA	300mA
Dropout Voltage (Max)	0.29V @ 300mA	0.29V @ 300mA	0.65V @ 300mA	0.65V @ 300mA
Input Voltage (Max)	5.25V	5.25V	5.25V	5.25V
Quiescent Current	60 µA	60 µA	50 µA	50 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
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	61,325 pcs	647 pcs	90,100 pcs	33,180 pcs

Engineering Selection Recommendations

All substitute parts listed maintain active product status and ROHS3 compliance, ensuring regulatory alignment with the main part AP7343D-33FS4-7B.

For direct functional replacement: Select AP7343-33FS4-7B when identical dropout voltage and quiescent current specifications are required. This part shares all electrical and mechanical characteristics with the main part and is suitable for applications where low-dropout performance is critical.

For alternative performance profiles: Select AP7341-33FS4-7 or AP7341D-33FS4-7 when higher dropout voltage tolerance is acceptable and lower quiescent current is beneficial for power-constrained applications. These parts maintain full compatibility with the 4-XDFN package and operating temperature range.

For supply chain continuity: All four parts are actively produced by Diodes Incorporated. Selection should be based on availability, dropout voltage requirements, and quiescent current specifications relevant to the target application.

Frequently Asked Questions (FAQ)

Q: Can AP7341-33FS4-7 be used as a direct replacement for AP7343D-33FS4-7B?

A: Yes, within the constraints of your application. Both parts deliver 3.3V at 300mA in the same 4-XDFN package. The key difference is dropout voltage: AP7341-33FS4-7 has a maximum dropout of 0.65V compared to 0.29V for AP7343D-33FS4-7B. If your input voltage remains sufficiently above the output voltage plus dropout, the AP7341 series is functionally compatible.

Q: What is the significance of the dropout voltage difference between AP7343 and AP7341 series?

A: Dropout voltage determines the minimum input-to-output voltage differential required for proper regulation. The AP7343D series (0.29V dropout) operates with lower input voltages, while the AP7341 series (0.65V dropout) requires a larger voltage margin. Select based on your minimum input voltage specification.

Q: Are all substitute parts in the same package?

A: Yes. All parts use the 4-XDFN Exposed Pad package with identical pinout and footprint, enabling direct PCB-level substitution without layout changes.

Q: Do all parts meet the same regulatory requirements?

A: Yes. All listed parts are ROHS3 compliant, REACH unaffected, and carry the same ECCN (EAR99) and HTSUS classifications as the main part.

Q: Which substitute offers the best availability?

A: AP7341-33FS4-7 has the highest inventory (90,100 pcs), followed by AP7341D-33FS4-7 (33,180 pcs). The main part AP7343D-33FS4-7B has 61,325 pcs in stock.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message