AP7346D-3318FS6-7 Equivalent & Substitute Parts

Part Overview

The AP7346D-3318FS6-7 is a linear voltage regulator IC from Diodes Incorporated designed for dual-output power management applications. This device provides positive fixed outputs at 1.8V and 3.3V with 130mA per channel, housed in a 6-pin X2-DFN1212-6 package. The part is currently in Last Time Buy status, making identification of equivalent and substitute components essential for ongoing design support and production continuity.

Substiute Parts

AP7346D-3318FS6-7

Diodes IncorporatedIn Stock: 15702AP7346D-3318FS6-7 Datasheet

Current PartRFQ

AP7345D-3318RH4-7

Diodes IncorporatedIn Stock: 18856AP7345D-3318RH4-7 Datasheet

MFR RecommendedRFQ

AP7346D-1833FS6-7

Diodes IncorporatedIn Stock: 5774AP7346D-1833FS6-7 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AP7346D-3318FS6-7 is determined by the following critical parameters:

Functional Requirements:

• Dual-output linear voltage regulator configuration
• Fixed output voltages at 1.8V and 3.3V
• Minimum output current capability of 130mA per channel
• Maximum input voltage of 5.25V
• Positive output configuration

Electrical Compatibility:

• Quiescent current within acceptable range for low-power applications
• PSRR performance at 75dB (1kHz) or better
• Dropout voltage specifications suitable for 5V input operation
• Enable control feature for power management

Physical & Compliance Requirements:

• Surface mount packaging compatible with X2-DFN footprints
• Operating temperature range -40°C ~ 85°C
• ROHS3 compliance and REACH unaffected status
• Moisture sensitivity level 1 (unlimited shelf life)

The substitute parts listed below meet these criteria with variations in output current capability and package density.

Parameter Comparison

Engineering Selection Recommendations

AP7345D-3318RH4-7 (MFR Recommended Substitute)

This part is the manufacturer-recommended alternative for the AP7346D-3318FS6-7. The AP7345D-3318RH4-7 maintains identical output voltage specifications (1.8V and 3.3V) and input voltage limits (5.25V maximum). The primary advantage is increased output current capability at 300mA per channel, compared to 130mA in the original part. This provides design headroom for applications requiring higher current delivery.

The AP7345D-3318RH4-7 is in Active product status, ensuring long-term availability and continued manufacturing support. The package footprint changes from 6-pin to 8-pin X2-DFN, requiring PCB layout modification. Additional control features include current limit protection in addition to the enable function. Quiescent current increases slightly to 140 µA, and protection features shift from over-current to short-circuit protection.

AP7346D-1833FS6-7 (Parametric Equivalent)

This part provides a direct parametric match to the AP7346D-3318FS6-7 with identical electrical specifications and package footprint. The output voltage order is reversed (1.8V, 3.3V versus 3.3V, 1.8V in the main part), but this represents a pin configuration difference rather than a functional change. Both parts deliver 130mA per channel with matching dropout voltage, quiescent current, and PSRR performance.

The AP7346D-1833FS6-7 is also in Last Time Buy status. This part is suitable for direct replacement in existing designs without PCB modification, provided the output voltage pin assignment is compatible with the application circuit.

Both substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 rating, ensuring regulatory and environmental compatibility with the original component.

Frequently Asked Questions (FAQ)

Q: Can the AP7345D-3318RH4-7 be used as a direct drop-in replacement for the AP7346D-3318FS6-7?

A: The AP7345D-3318RH4-7 is not a direct drop-in replacement due to package footprint differences. The main part uses a 6-pin X2-DFN1212-6 package, while the substitute uses an 8-pin X2-DFN1612-8 package. PCB layout and routing modifications are required. However, the electrical specifications are compatible for applications requiring 130mA or less per channel.

Q: What is the key difference between the AP7345D-3318RH4-7 and the AP7346D-1833FS6-7?

A: The AP7345D-3318RH4-7 provides higher output current (300mA per channel) in a larger 8-pin package with active product status. The AP7346D-1833FS6-7 maintains the same 130mA output current and 6-pin package as the original part, offering a footprint-compatible alternative. The AP7346D-1833FS6-7 is suitable for direct PCB replacement without layout changes.

Q: Are all three parts ROHS3 compliant?

A: Yes, the AP7346D-3318FS6-7, AP7345D-3318RH4-7, and AP7346D-1833FS6-7 are all ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating. All parts are REACH unaffected.

Q: What is the significance of the Last Time Buy status for the AP7346D-3318FS6-7?

A: Last Time Buy status indicates that the manufacturer will discontinue production after a specified date. The AP7345D-3318RH4-7 is recommended for new designs due to its Active product status, ensuring continued availability and manufacturing support beyond the discontinuation window.

Q: Can the AP7345D-3318RH4-7 be used in applications requiring only 130mA output current?

A: Yes. The AP7345D-3318RH4-7 is rated for 300mA per channel, making it suitable for applications requiring 130mA or less. The higher current rating provides design margin and does not negatively impact performance in lower-current applications.

Q: What are the protection feature differences between these parts?

A: The AP7346D-3318FS6-7 and AP7346D-1833FS6-7 include over-current protection. The AP7345D-3318RH4-7 includes short-circuit protection. Both protection schemes are suitable for power management applications; the specific choice depends on application requirements and circuit design.

Q: Do these parts require different control circuitry?

A: All three parts include an Enable control feature. The AP7345D-3318RH4-7 adds current limit control capability. Existing enable circuitry designed for the AP7346D-3318FS6-7 is compatible with both substitute parts. The additional current limit feature in the AP7345D-3318RH4-7 is optional and does not require modification to existing enable control circuits.