AP7353-18FS4-7 Equivalent & Substitute Parts

Part Overview

The AP7353-18FS4-7 is an active linear voltage regulator IC manufactured by Diodes Incorporated, classified as a Power Management (PMIC) component. This device delivers a fixed positive 1.8V output at 250mA with integrated over-current and over-temperature protection. The part operates across the automotive temperature range (-40°C to 85°C) and carries AEC-Q100 qualification, making it suitable for automotive and industrial applications requiring regulated low-voltage power distribution.

The AP7353-18FS4-7 is currently in active production status with 722 units in stock. Equivalent substitute parts are identified based on matching electrical performance parameters and mechanical compatibility to support design flexibility, inventory management, and supply chain continuity.

Substiute Parts

AP7353-18FS4-7

Diodes IncorporatedIn Stock: 827AP7353-18FS4-7 Datasheet

Current PartRFQ

RT9073A-18GQZ

Richtek USA Inc.In Stock: 86333RT9073A-18GQZ Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AP7353-18FS4-7 are identified based on strict electrical and mechanical parameter matching within the linear voltage regulator category. The substitution criteria are:

Core Electrical Parameters (Must Match):

• Fixed output voltage: 1.8V
• Output current rating: 250mA
• Maximum input voltage: 5.5V
• Output configuration: Positive fixed
• Number of regulators: 1
• Control features: Enable function
• Protection features: Over-current and over-temperature protection
• Operating temperature range: -40°C to 85°C

Mechanical Parameters (Must Match):

• Mounting type: Surface mount
• Package classification: 4-pin DFN/ZQFN with exposed pad
• RoHS compliance: ROHS3 compliant

Parameters Allowing Variation:

• Voltage dropout specification (lower values indicate improved efficiency)
• Quiescent current (lower values indicate reduced standby power consumption)
• PSRR (Power Supply Rejection Ratio) performance
• Packaging format (tape & reel versus cut tape/digi-reel)
• Supplier device package designation (X2-DFN1010-4 versus 4-ZQFN 1x1)

The RT9073A-18GQZ qualifies as a parametric equivalent based on matching all core electrical and mechanical requirements while offering different performance characteristics in dropout voltage and quiescent current.

Parameter Comparison

Engineering Selection Recommendations

Both the AP7353-18FS4-7 and RT9073A-18GQZ are active production components with ROHS3 compliance and REACH unaffected status, qualifying them for use in regulated supply chains.

AP7353-18FS4-7 Selection Criteria:

• Automotive-grade qualification (AEC-Q100) required
• Lower dropout voltage (0.24V) preferred for applications with limited input voltage headroom
• Higher quiescent current (27 µA) acceptable for designs where standby power is not critical
• Tape & reel packaging for high-volume manufacturing environments

RT9073A-18GQZ Selection Criteria:

• Industrial or non-automotive applications where AEC-Q100 is not required
• Lower quiescent current (3 µA) beneficial for battery-powered or low-power standby applications
• Higher dropout voltage (0.8V) acceptable when input voltage margin is sufficient
• Cut tape and digi-reel packaging suitable for lower-volume or prototype applications

Both parts maintain identical output voltage, current rating, input voltage maximum, operating temperature range, and protection feature sets. Selection between these parts depends on application-specific requirements for dropout performance, standby power consumption, and supply chain packaging format.

Frequently Asked Questions (FAQ)

Q: Can the RT9073A-18GQZ directly replace the AP7353-18FS4-7 in an automotive application?

A: The RT9073A-18GQZ is not qualified to AEC-Q100 automotive standards. If automotive qualification is a design requirement, the AP7353-18FS4-7 must be used. For non-automotive applications, the RT9073A-18GQZ is electrically compatible.

Q: What is the impact of the different dropout voltages (0.24V vs. 0.8V)?

A: Dropout voltage determines the minimum input voltage required to maintain regulated output. The AP7353-18FS4-7 requires 2.04V minimum input (1.8V output + 0.24V dropout), while the RT9073A-18GQZ requires 2.6V minimum input (1.8V output + 0.8V dropout). Applications with input voltages between 2.04V and 2.6V require the AP7353-18FS4-7.

Q: What is the significance of the quiescent current difference (27 µA vs. 3 µA)?

A: Quiescent current represents power consumption when the regulator is enabled but delivering minimal load current. The RT9073A-18GQZ consumes 24 µA less quiescent current, resulting in lower standby power dissipation. This difference is significant in battery-powered applications or designs with extended idle periods.

Q: Are the package types interchangeable?

A: Both parts use 4-pin DFN packages with exposed pads (4-XDFN Exposed Pad classification). The supplier device packages differ (X2-DFN1010-4 Type B versus 4-ZQFN 1x1), but both occupy the same physical footprint and pin configuration. PCB layouts designed for one part accommodate the other without modification.

Q: What is the difference between tape & reel and cut tape packaging?

A: Tape & reel packaging (AP7353-18FS4-7) is optimized for automated pick-and-place assembly in high-volume manufacturing. Cut tape and digi-reel packaging (RT9073A-18GQZ) is suitable for lower-volume production, prototyping, and manual assembly. Both formats contain identical components; packaging format selection depends on manufacturing process requirements.

Q: Are both parts RoHS compliant?

A: Yes, both the AP7353-18FS4-7 and RT9073A-18GQZ are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for commercial and industrial markets.

Q: Can I use either part interchangeably in a design?

A: Electrical interchangeability depends on application-specific requirements. Both parts deliver identical 1.8V at 250mA with matching protection features and operating temperature range. Substitution is valid when: (1) automotive qualification is not required, or (2) the AP7353-18FS4-7 is used in automotive applications, and (3) the input voltage margin accommodates the dropout voltage specification of the selected part.