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Diodes Incorporated AP7343D-18W5-7
- Part No.:
- AP7343D-18W5-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7343D-18W5-7.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:2,950
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Product details
Overview
AP7343D-18W5-7 from Diodes Incorporated is a 300mA low-dropout linear regulator with fixed 1.8V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µVrms output noise (10Hz–100kHz), and 35µA quiescent current - designed for RF supply rails in compact portable electronics.
For engineers reviewing the AP7343D-18W5-7 datasheet, AP7343D-18W5-7 pinout, AP7343D-18W5-7 application, or AP7343D-18W5-7 equivalent, key selection criteria include dropout voltage at 300mA (0.35V typ. for 1.8V output), enable-controlled shutdown (EN pin threshold: 0–0.5V low, 1.3–5.25V high), thermal shutdown at +150°C, and compatibility with 1µF ceramic input/output capacitors.
Technical Context
The AP7343D-18W5-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and thermal shutdown protection. Its enable input provides precise on/off control without floating-state risk, and the built-in discharge function (indicated by "D" suffix) actively pulls VOUT to GND during shutdown.
This regulator operates across 1.7V–5.25V input range while maintaining stable 1.8V output under load transients up to 300mA. It achieves low-noise regulation via optimized internal biasing and supports dense PCB layouts using either X2-DFN1010-4 (Type B) or SOT25 packages - both RoHS-compliant and halogen-free.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% at +25°C; ensures stable core logic or I/O rail for low-voltage SoCs and PMICs. |
| Max Output Current | 300mA guaranteed; sufficient for RF transceivers, camera ISPs, or baseband processors in handheld devices. |
| PSRR | 75dB at 1kHz; suppresses switching noise from adjacent DC/DC converters feeding noisy power domains. |
| Output Noise | 60µVrms (10Hz–100kHz); minimizes jitter in clock-sensitive analog circuits like ADCs or RF synthesizers. |
| Quiescent Current | 35µA typical; extends battery life in always-on sensor nodes or standby modes of mobile applications. |
| Dropout Voltage | 0.35V typical at 300mA (1.8V output); enables operation from single-cell Li-ion (3.0–4.2V) or 3.3V rails with margin. |
| Enable Threshold | VIL ≤ 0.5V, VIH ≥ 1.3V; compatible with 1.8V/3.3V GPIOs without level-shifting. |
| Thermal Shutdown | +150°C activation with +20°C hysteresis; prevents latch-up during sustained overload or poor heatsinking. |
Pinout & Package
AP7343D-18W5-7 is packaged in SOT25 (5-pin, 2.9mm × 1.6mm × 1.1mm), featuring an exposed pad for thermal enhancement. The package supports reflow soldering and meets IPC/JEDEC J-STD-020 moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN1 (VOUT) | Regulated Power Output | Delivers clean 1.8V to load; requires local 1µF ceramic capacitor placed adjacent to pin and GND. |
| PIN2 (GND) | Analog/Digital Ground Reference | Primary return path for regulator current; must connect directly to low-impedance ground plane. |
| PIN3 (EN) | Active-High Enable Control | Drives high (>1.3V) to activate regulator; pulled low (<0.5V) to enter shutdown with active discharge. |
| PIN4 (VIN) | Unregulated Input Supply | Accepts 1.7–5.25V; requires 0.47µF ceramic decoupling capacitor placed within 2mm of this pin. |
| PIN5 (NC) | No Connection | Internally unconnected; must remain floating or grounded per layout best practice - not used for signal or power. |
Key Features
| Feature | Design Value |
|---|---|
| Active Output Discharge | Internal 30Ω NMOS discharges VOUT to GND within microseconds upon EN deactivation - prevents floating rail in multi-rail systems. |
| Ultra-Low Quiescent Current | 35µA operating / 0.01µA shutdown - enables >1-year battery life in IoT sensors with periodic wake-up cycles. |
| High PSRR at Low Frequencies | 75dB at 1kHz - critical for rejecting ripple from buck converters powering baseband or audio subsystems. |
| Stable with Small Ceramic Capacitors | Works with 1µF COUT; eliminates need for bulky tantalum or polymer caps, reducing board area and cost. |
| Wide Input Voltage Range | 1.7V–5.25V operation - supports direct connection to single-cell Li-ion, USB VBUS, or intermediate 3.3V/2.5V rails. |
| Automotive-Qualified Variant Available | AP7343Q version qualified to AEC-Q100 Grade 1 (−40°C to +125°C) - suitable for infotainment and ADAS power domains. |
Applications
| RF Power Amplifier Supply | Mobile Camera ISP Core Rail |
|---|---|
|
Use Scenario: Providing clean bias to LTE/Wi-Fi PA stages in smartphones where switching noise causes EVM degradation. IC Role / Device Role / Timing Role: Low-noise LDO delivering stable 1.8V to PA driver stage, rejecting noise from shared 3.3V system rail. Use Value: 60µVrms noise and 75dB PSRR maintain <−45dBc EVM under full transmit power, meeting 3GPP TRP requirements. |
Use Scenario: Powering image signal processor cores in dual-camera modules requiring tight voltage tolerance and fast transient response. IC Role / Device Role / Timing Role: Primary 1.8V core regulator with 300mA capability and <10µs load-step recovery (COUT=4.7µF). Use Value: 0.35V dropout enables use with aging batteries down to 2.15V input; ±1% accuracy ensures consistent ISP timing and ADC linearity. |
| Wireless Headset Audio Codec Rail | BLE SoC I/O Interface Supply |
|
Use Scenario: Supplying analog audio codec in true wireless stereo (TWS) earbuds where battery voltage drops below 3.0V during discharge. IC Role / Device Role / Timing Role: Dedicated 1.8V LDO for DAC/ADC section, isolated from noisy digital domain via PSRR filtering. Use Value: 35µA quiescent current extends playback time by 8–12%; thermal shutdown protects against coil heating-induced overloads. |
Use Scenario: Powering GPIO and serial interface (SPI/I²C) of Bluetooth LE microcontrollers in wearables with strict size constraints. IC Role / Device Role / Timing Role: Compact SOT25-packaged LDO enabling minimal footprint while supporting 1.8V logic-level compatibility. Use Value: X2-DFN1010-4 and SOT25 options allow layout flexibility; EN pin enables synchronized power sequencing with host MCU reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-1802E/MB | 300mA, 1.8V, ±2% accuracy, 65dB PSRR @1kHz, no discharge function, SOT23-5 package. | Lacks active discharge; higher dropout (0.6V @300mA) limits low-VIN usability. | Choose when discharge is unnecessary and cost is primary constraint; verify thermal margin with RθJA=220°C/W. |
| Torex XC6210B182MR-G | 300mA, 1.8V, ±1% accuracy, 70dB PSRR @1kHz, 45µVrms noise, SOT25, no discharge. | No discharge path; slightly higher noise and lower PSRR than AP7343D-18W5-7. | Select for legacy designs already using XC6210 series; confirm EN timing compatibility with existing control logic. |
Compared with MCP1703T-1802E/MB and XC6210B182MR-G, the AP7343D-18W5-7 delivers superior PSRR (75dB vs. ≤70dB), lower noise (60µVrms), and integrated discharge - making it optimal for space-constrained, noise-sensitive RF and imaging applications requiring rapid power-down sequencing.
Availability
AP7343D-18W5-7 is available at Aetrix Electronics and suitable for RF power amplifiers, mobile camera ISPs, wireless headset audio codecs, and BLE SoC I/O interfaces requiring stable component supply across high-mix, low-volume production runs.
Supply support for AP7343D-18W5-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP7343 series belongs to Diodes' high-PSRR, low-noise LDO portfolio - engineered specifically for noise-critical portable electronics where battery efficiency, small footprint, and fast transient response are mandatory.
FAQ
What is the purpose of the NC pin (PIN5) in the SOT25 package?
PIN5 is a no-connect terminal with no internal bond wire or circuit connection. It must remain electrically floating in PCB layout; grounding or routing signals to it may cause parasitic coupling or thermal imbalance. Diodes Incorporated specifies this pin as unused to maintain package symmetry and thermal performance consistency across variants.
Does AP7343D-18W5-7 require an external pull-up resistor on the EN pin?
No external pull-up is required. When EN is left unconnected, leakage current and internal structure keep the regulator enabled - but Diodes recommends tying EN directly to VIN if enable control is unused, ensuring deterministic startup and avoiding noise-induced toggling. Floating EN is not permitted per datasheet Section 7.2.
How does the active discharge function affect system power sequencing?
The internal 30Ω discharge FET rapidly collapses VOUT to GND within ~100µs after EN goes low, preventing back-powering of upstream regulators or unintended logic states in downstream ICs. This eliminates need for external bleed resistors and simplifies sequencing in multi-rail systems where 1.8V must fall before 3.3V or VBAT.
Can AP7343D-18W5-7 operate with only a 0.47µF input capacitor?
Yes - the datasheet specifies a minimum 0.47µF ceramic capacitor between VIN and GND. However, for applications with large input current transients (e.g., burst-mode RF transmission), adding a 2.2–4.7µF bulk capacitor in parallel improves stability and reduces VIN droop. Layout proximity (<2mm trace length) remains critical regardless of capacitance value.
AP7343D-18W5-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.25V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.39V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 60 µA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
AP7343D-18W5-7 FAQ
1.How can I place an order for AP7343D-18W5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7343D-18W5-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AP7343D-18W5-7 reliable?
The price and inventory of AP7343D-18W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7343D-18W5-7 is usually 5 days.
3.What payment methods are accepted for AP7343D-18W5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7343D-18W5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7343D-18W5-7?
AP7343D-18W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7343D-18W5-7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AP7343D-18W5-7?
For technical support, including AP7343D-18W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7343D-18W5-7 requirements.
6.How does Aetrix verify that AP7343D-18W5-7 is sourced from the original manufacturer or authorized distributors?
All AP7343D-18W5-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP7343D-18W5-7 meets industry standards.
7.What is the process for return or replacement of AP7343D-18W5-7?
All AP7343D-18W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7343D-18W5-7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AP7343D-18W5-7 part is unused and in its original packaging.
Return procedure for AP7343D-18W5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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