AP7351D-28FS4-7B Equivalent & Substitute Parts

Part Overview

The AP7351D-28FS4-7B is a linear voltage regulator IC from Diodes Incorporated, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 2.8V at 150mA with a maximum dropout voltage of 0.4V. The device is housed in a 4-XDFN Exposed Pad package and is currently in active production status. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter range.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Output Voltage (Fixed)	2.8V
Output Current	150mA
Input Voltage (Max)	5.5V
Dropout Voltage (Max)	0.4V @ 150mA
Package / Case	4-XDFN Exposed Pad
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
Control Features	Enable
Protection Features	Over Current
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the AP7351D-28FS4-7B are qualified based on the following critical parameters:

Fixed output voltage of 2.8V
Output current rating of 150mA
Maximum input voltage of 5.25V or higher
Maximum dropout voltage of 0.4V @ 150mA
4-XDFN Exposed Pad package or equivalent mechanical footprint
Surface mount configuration
Operating temperature range of -40°C ~ 85°C
Enable control feature and Over Current protection
RoHS3 compliance and MSL 1 rating

Substitutes are grouped into two categories: parametric equivalents from Diodes Incorporated (AP7354-28FS4-7 and AP7354D-28FS4-7) and cross-manufacturer equivalents (RP110L281D-TR from Nisshinbo Micro Devices Inc.).

Parameter Comparison

Parameter	AP7351D-28FS4-7B	AP7354-28FS4-7	AP7354D-28FS4-7	RP110L281D-TR
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Nisshinbo Micro Devices Inc.
Output Voltage (Fixed)	2.8V	2.8V	2.8V	2.8V
Output Current	150mA	150mA	150mA	150mA
Input Voltage (Max)	5.5V	5.5V	5.5V	5.25V
Dropout Voltage (Max)	0.4V @ 150mA	0.4V @ 150mA	0.4V @ 150mA	0.4V @ 150mA
Quiescent Current (Iq)	1 µA	0.6 µA	0.6 µA	2 µA
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
Control Features	Enable	Enable	Enable	Enable
Protection Features	Over Current	Over Current	Over Current	Over Current
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts maintain active product status and full RoHS3 compliance with MSL 1 rating, ensuring regulatory and environmental compatibility with the AP7351D-28FS4-7B.

The AP7354-28FS4-7 and AP7354D-28FS4-7 are direct Diodes Incorporated alternatives with identical electrical specifications and package configuration. The primary distinction between these two variants is the package type designation (Type B for AP7354D-28FS4-7).

The RP110L281D-TR from Nisshinbo Micro Devices Inc. is a cross-manufacturer equivalent with identical output voltage, current rating, dropout voltage, and package footprint. The maximum input voltage specification is 5.25V compared to 5.5V for the Diodes Incorporated variants, and quiescent current is 2 µA versus 1 µA for the AP7351D-28FS4-7B. These differences remain within acceptable operational parameters for most applications.

Frequently Asked Questions (FAQ)

Q: Can AP7354-28FS4-7 and AP7354D-28FS4-7 be used interchangeably with AP7351D-28FS4-7B?

A: Yes. Both parts are Diodes Incorporated products with identical output voltage (2.8V), output current (150mA), dropout voltage (0.4V @ 150mA), package configuration (4-XDFN Exposed Pad), and operating temperature range (-40°C ~ 85°C). The AP7354D-28FS4-7 includes Type B package designation. All three parts maintain RoHS3 compliance and MSL 1 rating.

Q: What is the difference in quiescent current between the main part and substitutes?

A: The AP7351D-28FS4-7B has a quiescent current of 1 µA. The AP7354 variants (both -28FS4-7 and D-28FS4-7) have 0.6 µA, and the RP110L281D-TR has 2 µA. These variations do not affect substitution eligibility as they remain within the operational specifications for this regulator category.

Q: Is the RP110L281D-TR from Nisshinbo Micro Devices Inc. a suitable substitute?

A: Yes. The RP110L281D-TR meets all critical substitution criteria: 2.8V fixed output, 150mA output current, 0.4V maximum dropout voltage, 4-XDFN Exposed Pad package, -40°C ~ 85°C operating temperature, Enable control, Over Current protection, RoHS3 compliance, and MSL 1 rating. The maximum input voltage is 5.25V versus 5.5V for Diodes Incorporated variants.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All substitute parts use the 4-XDFN Exposed Pad package configuration with identical mechanical footprint and pin assignment, ensuring direct PCB compatibility without layout modifications.

Q: Do all substitute parts maintain the same regulatory compliance?

A: Yes. All parts listed are RoHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the AP7351D-28FS4-7B.

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