AP7343-12FS4-7B Equivalent & Substitute Parts

Part Overview

The AP7343-12FS4-7B is a linear voltage regulator IC manufactured by Diodes Incorporated, designed for positive fixed 1.2V output applications with 300mA current capacity. This Surface Mount device operates across -40°C to 85°C and features integrated over-current protection with enable control functionality. The part is Active status and ROHS3 compliant, making it suitable for modern electronic applications requiring regulated 1.2V power delivery in compact form factors.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the allowed parameter specifications for this product category.

Key Parameters

Parameter	Value
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	4-XDFN Exposed Pad (X2-DFN1010-4)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Protection Features	Over Current
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AP7343-12FS4-7B is determined by strict equivalence across the following critical parameters:

Fixed output voltage of 1.2V
Output current rating of 300mA
Maximum input voltage of 5.25V
Package type: 4-XDFN Exposed Pad (X2-DFN1010-4)
Surface Mount mounting configuration
Operating temperature range: -40°C ~ 85°C
Over-current protection and enable control features
ROHS3 compliance and REACH unaffected status

The AP7343-12FS4-7B has three qualified substitutes: AP7341-12FS4-7, AP7341D-12FS4-7, and AP7343D-12FS4-7B. All three maintain identical output voltage, current capacity, input voltage limits, package configuration, and operating temperature specifications. Variations in voltage dropout and quiescent current are within acceptable tolerance ranges for this regulator class and do not affect functional substitutability.

Parameter Comparison

Parameter	AP7343-12FS4-7B	AP7341-12FS4-7	AP7341D-12FS4-7	AP7343D-12FS4-7B
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Output Voltage (Fixed)	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	0.65V @ 300mA	0.65V @ 300mA	0.58V @ 300mA
Quiescent Current	60 µA	50 µA	50 µA	60 µA
PSRR	75dB (1kHz)	75dB (1kHz)	75dB (1kHz)	75dB (1kHz)
Package	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	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Protection Features	Over Current	Over Current	Over Current	Over Current
Control Features	Enable	Enable	Enable	Enable
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All four parts maintain Active product status and full ROHS3 compliance with REACH unaffected designation, confirming regulatory equivalence for modern applications.

The AP7343-12FS4-7B and AP7343D-12FS4-7B share identical electrical specifications including 0.58V maximum dropout voltage and 60 µA quiescent current. The primary distinction is packaging format: AP7343-12FS4-7B is supplied in Tape & Reel (TR) configuration, while AP7343D-12FS4-7B is supplied in Cut Tape (CT) & Digi-Reel® format. Selection between these variants depends on procurement and assembly requirements.

The AP7341-12FS4-7 and AP7341D-12FS4-7 present alternative specifications with 0.65V maximum dropout voltage and 50 µA quiescent current. These variants are functionally equivalent for applications where the slightly higher dropout voltage and lower quiescent current are acceptable. AP7341-12FS4-7 is supplied in Tape & Reel format, while AP7341D-12FS4-7 is supplied in Cut Tape & Digi-Reel® format.

Frequently Asked Questions (FAQ)

Q: Can AP7341-12FS4-7 replace AP7343-12FS4-7B directly?

A: Yes. Both parts deliver 1.2V fixed output at 300mA with identical input voltage limits, package configuration, and operating temperature range. The AP7341 variant has 0.65V maximum dropout versus 0.58V for the AP7343, and 50 µA quiescent current versus 60 µA. These differences are within acceptable tolerance for linear regulator substitution in this class.

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

A: Tape & Reel (TR) packaging supplies components on continuous tape suitable for high-volume automated assembly. Cut Tape (CT) & Digi-Reel® packaging provides components on cut tape segments, typically for lower-volume or mixed-component orders. Both formats use identical 4-XDFN Exposed Pad packages with no functional or electrical differences.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. AP7343-12FS4-7B, AP7341-12FS4-7, AP7341D-12FS4-7, and AP7343D-12FS4-7B are all ROHS3 compliant with REACH unaffected status, meeting regulatory requirements for modern electronic applications.

Q: Does the 0.07V difference in maximum dropout voltage affect circuit design?

A: The dropout voltage difference between AP7343 (0.58V) and AP7341 (0.65V) variants is 0.07V. This affects minimum input voltage headroom calculations. For applications with tight input voltage margins, verify that the higher dropout voltage of the AP7341 variant remains within system specifications.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, provided the design accommodates the electrical parameter ranges of the selected substitute. All four parts share identical output voltage, current capacity, package, and operating temperature specifications. Verify dropout voltage and quiescent current specifications against your circuit requirements before final selection.

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