AP7343-32FS4-7B Equivalent & Substitute Parts

Part Overview

The AP7343-32FS4-7B is a linear voltage regulator IC from Diodes Incorporated, classified as a Power Management (PMIC) component. This device delivers a fixed 3.2V output at 300mA with a maximum dropout voltage of 0.29V, designed for surface mount applications in the 4-XDFN Exposed Pad package. The part is currently active in production with 944 units in stock. Substitute parts are identified based on matching electrical specifications, package compatibility, and regulatory compliance to support component procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP7343-32FS4-7B
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Packaging	Tape & Reel (TR)
Package / Case	4-XDFN Exposed Pad
Voltage - Output (Fixed)	3.2V
Current - Output	300mA
Voltage - Input (Max)	5.25V
Voltage Dropout (Max)	0.29V @ 300mA
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the AP7343-32FS4-7B are identified based on the following critical parameters that determine functional equivalence:

Fixed output voltage of 3.2V
Output current rating 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 AP7341-32FS4-7 and AP7341D-32FS4-7 variants share identical electrical specifications with the main part except for dropout voltage performance (0.65V vs. 0.29V). The AP7343D-32FS4-7B is a direct parametric equivalent with identical dropout voltage and quiescent current characteristics.

Parameter Comparison

Parameter	AP7343-32FS4-7B	AP7341-32FS4-7	AP7341D-32FS4-7	AP7343D-32FS4-7B
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Voltage - Output (Fixed)	3.2V	3.2V	3.2V	3.2V
Current - Output	300mA	300mA	300mA	300mA
Voltage - Input (Max)	5.25V	5.25V	5.25V	5.25V
Voltage Dropout (Max)	0.29V @ 300mA	0.65V @ 300mA	0.65V @ 300mA	0.29V @ 300mA
Current - Quiescent (Iq)	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
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 listed substitute parts maintain active product status with ROHS3 compliance and MSL 1 rating, ensuring regulatory alignment and moisture sensitivity compatibility. The AP7343D-32FS4-7B provides direct parametric equivalence to the main part with identical dropout voltage (0.29V) and quiescent current (60 µA) characteristics. The AP7341-32FS4-7 and AP7341D-32FS4-7 are functionally compatible alternatives with higher dropout voltage (0.65V) and lower quiescent current (50 µA), suitable for applications where these performance differences are acceptable. All parts share identical package geometry, pin configuration, and electrical interface requirements.

Frequently Asked Questions (FAQ)

Q: Can AP7341-32FS4-7 be used as a direct replacement for AP7343-32FS4-7B?

A: The AP7341-32FS4-7 is functionally compatible but exhibits higher dropout voltage (0.65V vs. 0.29V). This difference affects minimum input voltage requirements and power dissipation. Substitution is valid only when the application's input voltage margin and thermal budget accommodate the higher dropout specification.

Q: What is the difference between AP7343-32FS4-7B and AP7343D-32FS4-7B?

A: Both parts are parametric equivalents with identical electrical specifications, including 0.29V dropout voltage and 60 µA quiescent current. The primary difference is inventory availability (944 units vs. 1057 units). Both are suitable for direct substitution.

Q: Are all substitute parts in the same package?

A: Yes. All listed parts use the 4-XDFN Exposed Pad package with X2-DFN1010-4 supplier device package designation, ensuring identical PCB footprint and mounting requirements.

Q: What regulatory certifications apply to these parts?

A: All parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8542.39.0001. Moisture sensitivity level is MSL 1 (unlimited), indicating no special storage or handling requirements.

Q: How do quiescent current differences affect circuit design?

A: The AP7341 variants draw 50 µA quiescent current compared to 60 µA for AP7343 variants. This 10 µA difference is negligible in most applications but may be relevant in ultra-low-power standby scenarios where every microamp contributes to total system current consumption.

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