AP7353-28FS4-7 Equivalent & Substitute Parts

Part Overview

The AP7353-28FS4-7 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed for positive fixed output applications. This automotive-grade component (AEC-Q100 series) delivers 250mA output current at a fixed 2.8V output voltage with a maximum dropout voltage of 0.155V at rated current. The device is actively produced and widely used in power management applications requiring low-noise, regulated DC supply.

Substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or specific application performance parameters while maintaining functional equivalence within the defined electrical and mechanical specifications.

Substiute Parts

AP7353-28FS4-7

Diodes IncorporatedIn Stock: 1047AP7353-28FS4-7 Datasheet

Current PartRFQ

RT9073A-28GQZ

Richtek USA Inc.In Stock: 85336RT9073A-28GQZ Datasheet

Parametric EquivalentRFQ

RT9086-28GQZ

Richtek USA Inc.In Stock: 2806RT9086-28GQZ Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AP7353-28FS4-7 are qualified based on the following critical parameters:

Electrical Equivalence Criteria:

• Fixed output voltage of 2.8V
• Output current rating of 250mA
• Maximum input voltage of 5.5V
• Operating temperature range of -40°C to 85°C
• Enable control feature
• Over Current and Over Temperature protection

Mechanical Equivalence Criteria:

• Surface mount technology
• 4-pin package configuration with exposed pad
• Footprint compatibility within 4-XDFN/4-ZQFN family

Compliance Criteria:

• RoHS3 compliance
• REACH unaffected status
• Active product status

The identified substitutes (RT9073A-28GQZ and RT9086-28GQZ) meet all core electrical and mechanical requirements. Variations in dropout voltage, quiescent current, and PSRR performance are secondary parameters that may influence selection based on specific application requirements but do not disqualify functional substitution.

Parameter Comparison

Engineering Selection Recommendations

AP7353-28FS4-7 (Primary Part)

The AP7353-28FS4-7 is the primary specification. This part is actively produced by Diodes Incorporated and carries automotive-grade qualification (AEC-Q100 series). It delivers the lowest dropout voltage (0.155V @ 250mA) among the three options, making it optimal for applications with tight input voltage margins. Current inventory of 1008 pieces supports immediate availability for production requirements.

RT9086-28GQZ (Preferred Substitute)

The RT9086-28GQZ from Richtek USA Inc. provides the closest performance match to the primary part. Dropout voltage of 0.25V @ 250mA remains within acceptable operating margins for most applications. PSRR performance (88dB ~ 60dB across 100Hz ~ 100kHz) exceeds the primary part specification. Quiescent current of 25µA closely matches the primary part at 27µA. This substitute is suitable for direct replacement in designs where the primary part is unavailable. Current inventory of 2726 pieces supports production continuity.

RT9073A-28GQZ (Secondary Substitute)

The RT9073A-28GQZ from Richtek USA Inc. is qualified as a functional substitute with the following considerations: dropout voltage of 0.6V @ 250mA is significantly higher than the primary part, requiring verification that input voltage headroom accommodates this specification. Quiescent current of 3µA is substantially lower, providing power efficiency advantage in battery-powered applications. PSRR specification of 75dB @ 1kHz is lower than the primary part. This substitute is applicable in applications where lower quiescent current is prioritized and input voltage margin is adequate. Current inventory of 85300 pieces provides extended supply availability.

All three parts maintain identical output voltage (2.8V), output current (250mA), operating temperature range (-40°C to 85°C), and protection features (Over Current, Over Temperature). All parts are RoHS3 compliant and REACH unaffected. Surface mount packaging and 4-pin configuration ensure PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can RT9086-28GQZ be used as a direct replacement for AP7353-28FS4-7?

A: Yes. The RT9086-28GQZ meets all core electrical and mechanical specifications: 2.8V fixed output, 250mA output current, 5.5V maximum input voltage, -40°C to 85°C operating range, Enable control, and Over Current/Over Temperature protection. Package configuration (4-XDFN Exposed Pad) and surface mount technology are identical. Dropout voltage of 0.25V @ 250mA is higher than the primary part (0.155V) but remains within acceptable operating margins for standard applications.

Q: What is the key difference between RT9073A-28GQZ and RT9086-28GQZ?

A: The primary differences are dropout voltage and quiescent current. RT9073A-28GQZ has a dropout voltage of 0.6V @ 250mA with quiescent current of 3µA. RT9086-28GQZ has a dropout voltage of 0.25V @ 250mA with quiescent current of 25µA. RT9086-28GQZ is closer in performance to the primary AP7353-28FS4-7 part. RT9073A-28GQZ is suitable for applications prioritizing low quiescent current consumption where input voltage headroom is sufficient to accommodate the higher dropout voltage.

Q: Are all three parts compatible with the same PCB layout?

A: Yes. All three parts use identical package configuration (4-XDFN Exposed Pad) and surface mount technology. PCB footprint, pad layout, and thermal via placement are compatible across AP7353-28FS4-7, RT9073A-28GQZ, and RT9086-28GQZ without layout modifications.

Q: Which substitute part should be selected for automotive applications?

A: The AP7353-28FS4-7 is the primary specification for automotive applications, carrying AEC-Q100 series qualification. If substitution is required, RT9086-28GQZ is the preferred alternative, offering performance characteristics closest to the primary part. RT9073A-28GQZ is not specified with automotive qualification in the provided data and should be evaluated against specific automotive requirements before selection.

Q: What is the impact of dropout voltage differences on circuit design?

A: Dropout voltage determines the minimum input voltage required to maintain regulated output. AP7353-28FS4-7 requires 2.955V minimum input (2.8V output + 0.155V dropout). RT9086-28GQZ requires 3.05V minimum input (2.8V output + 0.25V dropout). RT9073A-28GQZ requires 3.4V minimum input (2.8V output + 0.6V dropout). Applications with input voltages below 3.4V must use either the primary part or RT9086-28GQZ. Applications with input voltages below 3.05V must use the primary part.

Q: Are there differences in control features between the three parts?

A: No. All three parts include Enable control feature and identical protection features (Over Current, Over Temperature). Functional control and protection behavior are equivalent across AP7353-28FS4-7, RT9073A-28GQZ, and RT9086-28GQZ.

Q: What are the compliance and regulatory considerations for substitution?

A: All three parts are RoHS3 compliant and REACH unaffected. All parts are actively produced with active product status. Regulatory compliance is equivalent across all three options. The primary consideration for automotive applications is AEC-Q100 qualification, which is specified for the AP7353-28FS4-7 primary part.