AP7343D-12FS4-7B Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The AP7343D-12FS4-7B is an active linear voltage regulator IC from Diodes Incorporated, classified as a Power Management (PMIC) component. This positive fixed output regulator delivers 1.2V at 300mA output current with integrated over-current protection and enable control features. The part is in active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). 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	Diodes Incorporated
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.2V
Output Current	300mA
Input Voltage (Max)	5.25V
Voltage Dropout (Max)	0.58V @ 300mA
Quiescent Current	60 µA
PSRR	75dB (1kHz)
Package / Case	4-XDFN Exposed Pad (X2-DFN1010-4)
Operating Temperature	-40°C ~ 85°C
Control Features	Enable
Protection Features	Over Current
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the AP7343D-12FS4-7B are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Output voltage: 1.2V fixed
Output current capability: 300mA
Maximum input voltage: 5.25V
Package type: 4-XDFN Exposed Pad (X2-DFN1010-4)
Output configuration: Positive fixed
Control features: Enable function
Protection: Over-current protection
Operating temperature range: -40°C ~ 85°C
Regulatory compliance: RoHS3 compliant

Allowable Variation Parameters:

Voltage dropout: Maximum 0.65V @ 300mA (main part: 0.58V)
Quiescent current: 50 µA to 60 µA (main part: 60 µA)
Packaging format: Cut Tape (CT) or Tape & Reel (TR) formats are interchangeable for the same device package

The AP7341 series variants (AP7341-12FS4-7 and AP7341D-12FS4-7) meet all critical parameters with acceptable dropout voltage tolerance. The AP7343-12FS4-7B variant matches the main part identically across all electrical specifications.

Parameter Comparison

Parameter	AP7343D-12FS4-7B (Main)	AP7343-12FS4-7B	AP7341D-12FS4-7	AP7341-12FS4-7
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Output Voltage	1.2V	1.2V	1.2V	1.2V
Output Current	300mA	300mA	300mA	300mA
Input Voltage (Max)	5.25V	5.25V	5.25V	5.25V
Voltage Dropout (Max)	0.58V @ 300mA	0.58V @ 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 / 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
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed maintain active product status with full RoHS3 compliance and REACH unaffected certification, ensuring regulatory alignment with the main part AP7343D-12FS4-7B.

AP7343-12FS4-7B: Identical electrical specifications to the main part. Differs only in packaging format (Tape & Reel versus Cut Tape). Direct functional equivalent for applications where packaging format flexibility is acceptable.

AP7341D-12FS4-7 and AP7341-12FS4-7: These variants operate within specified tolerance for voltage dropout (0.65V maximum versus 0.58V for the main part) and quiescent current (50 µA versus 60 µA). Both maintain identical output voltage, current rating, input voltage limits, package type, and temperature operating range. Selection between these variants and the main part depends on dropout voltage and quiescent current requirements for the specific application circuit.

All parts are surface mount devices in the X2-DFN1010-4 package configuration with identical pinout and footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can AP7341-12FS4-7 replace AP7343D-12FS4-7B directly?

A: Yes, with consideration for dropout voltage. The AP7341-12FS4-7 operates at 0.65V maximum dropout versus 0.58V for the AP7343D-12FS4-7B. Both deliver 1.2V at 300mA with identical package, temperature range, and compliance certifications. Applications with tight input voltage margins should account for the additional 0.07V dropout.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Both formats contain the same device in the X2-DFN1010-4 package with identical electrical performance and pinout. Cut Tape (CT) is supplied in individual tape segments, while Tape & Reel (TR) is supplied on continuous reel. Selection depends on assembly process requirements and inventory management preferences.

Q: Are all substitute parts pin-compatible?

A: Yes. All listed parts use the 4-XDFN Exposed Pad package with identical pinout and footprint. PCB layout and schematic connections require no modification for substitution.

Q: Which substitute part has the lowest quiescent current?

A: AP7341D-12FS4-7 and AP7341-12FS4-7 both operate at 50 µA quiescent current, compared to 60 µA for the main part AP7343D-12FS4-7B. This 10 µA reduction may benefit battery-powered or low-power standby applications.

Q: Do all parts meet the same regulatory requirements?

A: Yes. All listed parts are RoHS3 compliant, REACH unaffected, and carry the same MSL 1 (unlimited) moisture sensitivity rating. No additional qualification is required for regulatory compliance when substituting between these parts.

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