AP7343-18FS4-7B Equivalent & Substitute Parts

Part Overview

The AP7343-18FS4-7B is a linear voltage regulator IC manufactured by Diodes Incorporated, designed for positive fixed 1.8V output applications with 300mA current capacity. This Surface Mount device operates across the -40°C to 85°C temperature range and is ROHS3 compliant. The part is currently in active production status with 854 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	Diodes Incorporated
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.8V
Output Current	300mA
Input Voltage (Max)	5.25V
Package / Case	4-XDFN Exposed Pad
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the AP7343-18FS4-7B are grouped based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Output voltage: 1.8V fixed
Output current capacity: 300mA
Input voltage maximum: 5.25V
Package type: 4-XDFN Exposed Pad (X2-DFN1010-4)
Surface Mount configuration
Operating temperature range: -40°C ~ 85°C
Control features: Enable function
Protection: Over Current protection
Regulatory compliance: ROHS3, REACH Unaffected, EAR99

Secondary Differentiation: Voltage dropout and quiescent current vary between substitute options. The AP7343-18FS4-7B and AP7343D-18FS4-7B maintain 0.39V dropout at 300mA with 60µA quiescent current. The AP7341-18FS4-7 and AP7341D-18FS4-7 variants feature 0.65V dropout at 300mA with 50µA quiescent current. Packaging format (Tape & Reel versus Cut Tape & Digi-Reel) represents the only non-electrical distinction among direct substitutes.

Parameter Comparison

Parameter	AP7343-18FS4-7B (Main)	AP7341-18FS4-7	AP7341D-18FS4-7	AP7343D-18FS4-7B
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Output Voltage	1.8V	1.8V	1.8V	1.8V
Output Current	300mA	300mA	300mA	300mA
Input Voltage (Max)	5.25V	5.25V	5.25V	5.25V
Voltage Dropout (Max)	0.39V @ 300mA	0.65V @ 300mA	0.65V @ 300mA	0.39V @ 300mA
Quiescent Current	60µA	50µA	50µA	60µA
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
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
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 production status with ROHS3 compliance and REACH unaffected regulatory standing. Selection between AP7343 and AP7341 variants depends on dropout voltage tolerance in the application circuit. The AP7343-18FS4-7B and AP7343D-18FS4-7B are electrically identical, differing only in packaging format (Tape & Reel versus Cut Tape & Digi-Reel). Similarly, AP7341-18FS4-7 and AP7341D-18FS4-7 are electrically identical with packaging format as the sole distinction. The AP7343D-18FS4-7B variant offers the highest inventory availability at 150,300 units. All parts share identical package geometry (X2-DFN1010-4), control features, and protection mechanisms, ensuring direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can AP7341 variants substitute for AP7343 variants? A: Yes, with circuit design consideration. Both maintain 1.8V output, 300mA capacity, and identical package geometry. The primary difference is voltage dropout: AP7343 variants feature 0.39V dropout while AP7341 variants feature 0.65V dropout at 300mA. Applications with tighter input-to-output voltage margins may require the lower dropout AP7343 variants.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel packaging? A: Both packaging formats contain electrically identical components. Tape & Reel (TR) packaging is supplied on continuous tape for automated assembly lines. Cut Tape & Digi-Reel (CT) packaging provides the same tape format but in cut segments for smaller volume requirements or manual assembly processes.

Q: Are all substitute parts pin-compatible? A: Yes. All listed substitutes use the 4-XDFN Exposed Pad package (X2-DFN1010-4) with identical pinout and footprint geometry, ensuring direct PCB compatibility without layout modifications.

Q: Do all parts meet the same regulatory requirements? A: Yes. All substitute parts are ROHS3 compliant, REACH unaffected, and classified under EAR99 export control with matching HTSUS code 8542.39.0001.

Q: Which substitute offers the best availability? A: AP7343D-18FS4-7B provides the highest inventory level at 150,300 units in stock, while maintaining electrical equivalence to the main part AP7343-18FS4-7B.

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