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AP7346D-1818FS6-7 Equivalent & Substitute Parts
Part Overview
The AP7346D-1818FS6-7 is a linear voltage regulator IC from Diodes Incorporated designed for dual-output positive fixed voltage regulation at 1.8V. This device delivers 130mA per output channel in a compact 6-pin X2-DFN1212-6 surface mount package. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring dual 1.8V regulated outputs.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Category | Power Management (PMIC) |
| Output Configuration | Positive, Fixed |
| Number of Regulators | 2 |
| Voltage - Output (Min/Fixed) | 1.8V, 1.8V |
| Current - Output | 130mA, 130mA |
| Voltage - Input (Max) | 5.25V |
| Voltage Dropout (Max) | 0.39V @ 120mA |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 6-XFDFN Exposed Pad |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the AP7346D-1818FS6-7 is determined by the following critical parameters:
- Dual-output configuration (2 regulators required)
- Fixed output voltage of 1.8V on both channels
- Maximum input voltage of 5.25V
- Operating temperature range of -40°C to 85°C
- Surface mount technology with exposed pad package
- ROHS3 compliance and REACH unaffected status
The AP7345D-1818RH4-7 qualifies as a manufacturer-recommended substitute. While it uses a larger 8-pin X2-DFN1612-8 package and provides higher output current (300mA per channel versus 130mA), it maintains identical output voltage specifications, input voltage limits, temperature range, and regulatory compliance. The increased current capability and package size do not prevent substitution in applications where the AP7346D-1818FS6-7 is specified, provided PCB layout accommodates the larger footprint.
Parameter Comparison
| Parameter | AP7346D-1818FS6-7 | AP7345D-1818RH4-7 |
|---|---|---|
| Manufacturer | Diodes Incorporated | Diodes Incorporated |
| Product Status | Last Time Buy | Active |
| Output Configuration | Positive, Fixed | Positive, Fixed |
| Number of Regulators | 2 | 2 |
| Voltage - Output (Min/Fixed) | 1.8V, 1.8V | 1.8V, 1.8V |
| Current - Output | 130mA, 130mA | 300mA, 300mA |
| Voltage - Input (Max) | 5.25V | 5.25V |
| Voltage Dropout (Max) | 0.39V @ 120mA | 0.39V @ 300mA |
| Current - Quiescent (Iq) | 100 µA | 140 µA |
| PSRR | 75dB (1kHz) | 75dB (1kHz) |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 6-XFDFN Exposed Pad | 8-XFDFN Exposed Pad |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| REACH Status | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
The AP7345D-1818RH4-7 is the manufacturer-recommended substitute for the AP7346D-1818FS6-7. Selection of this alternative is supported by:
- Active product status, ensuring continued availability and manufacturing support
- Identical output voltage specifications and input voltage limits
- Matching operating temperature range and regulatory compliance (ROHS3, REACH unaffected)
- Higher output current capability, which provides design margin for applications originally specified with 130mA per channel
- Equivalent PSRR performance and control features
The primary design consideration is package footprint change from 6-pin to 8-pin X2-DFN. PCB layout modification is required to accommodate the larger package dimensions. No electrical redesign is necessary.
Frequently Asked Questions (FAQ)
Q: Can the AP7345D-1818RH4-7 directly replace the AP7346D-1818FS6-7 without circuit modification?
A: Electrical substitution is direct. The output voltages, input voltage limits, and control features are identical. PCB layout must be modified to accommodate the 8-pin package versus the 6-pin original.
Q: What is the impact of the higher quiescent current (140 µA vs. 100 µA) in the substitute part?
A: The 40 µA difference in quiescent current is negligible in most applications. This parameter affects standby power consumption and is relevant only in ultra-low-power designs where every microamp is critical.
Q: Why does the AP7345D-1818RH4-7 have higher output current (300mA vs. 130mA)?
A: The substitute part uses a larger package with improved thermal characteristics, enabling higher current delivery. This does not prevent substitution; it provides additional design margin.
Q: Are there any control feature differences between these parts?
A: The AP7346D-1818FS6-7 includes Enable and Over Current protection. The AP7345D-1818RH4-7 includes Enable, Current Limit, and Short Circuit protection. The substitute offers enhanced protection features.
Q: Is the AP7345D-1818RH4-7 suitable for designs requiring the exact 6-pin package?
A: No. If PCB layout cannot accommodate an 8-pin package, the substitute is not viable. Alternative parts with identical 6-pin packaging must be evaluated.
Q: What compliance certifications apply to both parts?
A: Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.
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