AP7343D-185FS4-7B Equivalent & Substitute Parts

Part Overview

The AP7343D-185FS4-7B is a linear voltage regulator IC manufactured by Diodes Incorporated, classified as a Power Management (PMIC) component. This device delivers a fixed positive output of 1.85V at 300mA with integrated enable control and over-current protection. The part is actively produced and widely stocked, with 997 units available in inventory. Substitute parts become necessary when primary stock is depleted, when supply chain constraints occur, or when design flexibility requires alternative qualified sources within the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP7343D-185FS4-7B
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.85V
Output Current	300mA
Input Voltage (Max)	5.25V
Voltage Dropout (Max)	0.39V @ 300mA
Quiescent Current	60 µA
PSRR	75dB (1kHz)
Control Features	Enable
Protection Features	Over Current
Operating Temperature Range	-40°C ~ 85°C
Package / Case	4-XDFN Exposed Pad
Mounting Type	Surface Mount
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the AP7343D-185FS4-7B is determined by strict alignment of the following critical parameters:

Fixed output voltage of 1.85V
Output current rating of 300mA
Maximum input voltage of 5.25V
Package type: 4-XDFN Exposed Pad (X2-DFN1010-4)
Surface mount configuration
Enable control feature
Over-current protection
Operating temperature range of -40°C ~ 85°C
Active product status
ROHS3 compliance

The substitute parts AP7341D-185FS4-7 and AP7341-185FS4-7 meet all these criteria. Both are Diodes Incorporated linear voltage regulators with identical output voltage, current rating, input voltage specification, package type, and control/protection features. Variations in voltage dropout and quiescent current specifications remain within acceptable tolerances for this product category and do not disqualify substitution.

Parameter Comparison

Parameter	AP7343D-185FS4-7B (Main)	AP7341D-185FS4-7 (Substitute)	AP7341-185FS4-7 (Substitute)
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Output Voltage (Fixed)	1.85V	1.85V	1.85V
Output Current	300mA	300mA	300mA
Input Voltage (Max)	5.25V	5.25V	5.25V
Voltage Dropout (Max)	0.39V @ 300mA	0.42V @ 150mA	0.42V @ 150mA
Quiescent Current	60 µA	50 µA	50 µA
PSRR	75dB (1kHz)	75dB (1kHz)	75dB (1kHz)
Control Features	Enable	Enable	Enable
Protection Features	Over Current	Over Current	Over Current
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	4-XDFN Exposed Pad	4-XDFN Exposed Pad	4-XDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All three parts—AP7343D-185FS4-7B, AP7341D-185FS4-7, and AP7341-185FS4-7—maintain active product status with full ROHS3 compliance and unlimited moisture sensitivity rating. Selection between these parts is based on availability and inventory levels. The AP7343D-185FS4-7B offers the lowest voltage dropout specification at 0.39V @ 300mA, while both AP7341 variants specify 0.42V @ 150mA. The AP7343D variant also carries a higher quiescent current of 60 µA compared to 50 µA in the AP7341 variants. These differences do not affect functional compatibility in applications where the 1.85V fixed output, 300mA current capacity, and 4-XDFN package are required. All parts are suitable for direct substitution in surface-mount applications operating within the -40°C to 85°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can AP7341D-185FS4-7 or AP7341-185FS4-7 be used as direct replacements for AP7343D-185FS4-7B?

A: Yes. Both substitute parts deliver the same fixed output voltage of 1.85V, output current of 300mA, and use the identical 4-XDFN Exposed Pad package. All three parts are surface-mount components with enable control and over-current protection, operating across the same temperature range of -40°C to 85°C.

Q: What is the difference in voltage dropout between the main part and substitutes?

A: The AP7343D-185FS4-7B specifies a maximum dropout of 0.39V at 300mA. The AP7341D-185FS4-7 and AP7341-185FS4-7 specify 0.42V at 150mA. This difference does not prevent substitution in applications designed for the 1.85V output specification.

Q: Are there differences in quiescent current consumption?

A: The AP7343D-185FS4-7B draws 60 µA quiescent current, while both AP7341 variants draw 50 µA. This 10 µA difference is negligible in most power management applications and does not affect functional compatibility.

Q: Do all three parts share the same package and mounting requirements?

A: Yes. All three parts use the 4-XDFN Exposed Pad package (X2-DFN1010-4) and are configured for surface-mount assembly. PCB layout and reflow profiles remain identical across all three part numbers.

Q: Are there any compliance or certification differences?

A: No. All three parts are ROHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity rating, and maintain active product status. Regulatory compliance is equivalent across all substitutes.

Q: Which part should be selected based on inventory availability?

A: The AP7343D-185FS4-7B has 997 units in stock, AP7341D-185FS4-7 has 1027 units, and AP7341-185FS4-7 has 650 units available. Selection should prioritize application requirements first, then inventory levels as a secondary factor.

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