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Diodes Incorporated AP7343D-105W5-7
- Part No.:
- AP7343D-105W5-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7343D-105W5-7.pdf
- Description:
- IC REG LINEAR 1.05V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AP7343D-105W5-7 from Diodes Incorporated is a 300mA, 1.05V fixed-output low-dropout (LDO) regulator with high PSRR (75dB at 1kHz), ultra-low output noise (60µVrms, 10Hz–100kHz), ±1% output voltage accuracy, and enable control. Fabricated in CMOS, it delivers stable power to RF supplies and portable media subsystems where low quiescent current (35µA) and fast load transient response are critical.
For engineers reviewing the AP7343D-105W5-7 datasheet, AP7343D-105W5-7 pinout, AP7343D-105W5-7 application, or AP7343D-105W5-7 equivalent, this LDO is selected for compact battery-powered designs requiring precise 1.05V biasing, high ripple rejection under dynamic loads, and controlled startup/shutdown via EN pin - especially in space-constrained SOT25 layouts.
Technical Context
The AP7343D-105W5-7 integrates a CMOS pass transistor, precision voltage reference, error amplifier, thermal shutdown, and current-limit circuitry. Its enable input (EN) directly controls output state without external logic, with defined thresholds (VIL ≤ 0.5V, VIH ≥ 1.3V) ensuring robust digital interfacing.
It features built-in discharge functionality (denoted by "D" suffix), actively pulling VOUT to GND during shutdown to prevent floating rails in multi-rail systems. The device operates across 1.7V–5.25V input range and maintains regulation down to 220mV dropout at 300mA for 1.05V output in SOT25 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.05V ±1% - ensures stable core/bias rail for low-voltage logic or analog circuitry without external feedback. |
| Max Output Current | 300mA continuous - supports moderate-power RF ICs, camera sensors, or baseband processors in handheld devices. |
| PSRR | 75dB at 1kHz - suppresses switching noise from adjacent DC/DC converters, critical for clean RF supply domains. |
| Output Noise | 60µVrms (10Hz–100kHz) - minimizes phase noise in VCOs and jitter in high-speed interfaces powered from this rail. |
| Quiescent Current | 35µA typical - extends battery life in always-on or sleep-mode subsystems such as Bluetooth LE receivers. |
| Dropout Voltage | 0.51V max at 300mA (SOT25) - enables operation from single-cell Li-ion (3.0–4.2V) or 3.3V system rails with margin. |
| Enable Threshold | VIH ≥ 1.3V, VIL ≤ 0.5V - compatible with 1.8V/3.3V GPIO without level-shifting; prevents false triggering. |
Pinout & Package
AP7343D-105W5-7 is packaged in SOT25 (5-pin, 2.9mm × 1.6mm), featuring an exposed pad for thermal enhancement. Pin assignments are validated per Diodes DS37952 Rev. 12–2: PIN1 = VOUT, PIN2 = GND, PIN3 = EN, PIN4 = VIN, PIN5 = NC (no connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN1 (VOUT) | Regulated Power Output | Delivers stable 1.05V to load; requires local 1µF ceramic capacitor for stability and transient response. |
| PIN2 (GND) | Power Ground Reference | Primary return path for input/output current; must connect to low-impedance ground plane to minimize noise coupling. |
| PIN3 (EN) | Active-High Enable Control | Drives regulator ON/OFF; must not float - tie to VIN if unused; internal pull-down ensures safe default OFF state. |
| PIN4 (VIN) | Unregulated Input Supply | Accepts 1.7V–5.25V; requires 0.47µF ceramic decoupling capacitor placed within 2mm of pin to suppress supply glitches. |
| PIN5 (NC) | No Connection | Internally unconnected; PCB pad may be left unconnected or tied to GND for mechanical stability only - no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Discharge Path | 30Ω on-resistance (typ.) between VOUT and GND during shutdown - eliminates hold-up voltage, enabling safe sequencing in multi-rail systems. |
| High PSRR Architecture | 75dB @ 1kHz, >60dB up to 100kHz - achieved via optimized error amplifier gain and CMOS pass device design, reducing conducted EMI impact. |
| Ultra-Low Noise Regulation | 60µVrms broadband noise - enabled by low-noise reference and filtered internal bias networks, suitable for RF and precision analog stages. |
| Thermal Protection | +150°C shutdown threshold with +20°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
| Wide Input Range | 1.7V–5.25V operation - supports direct connection to Li-ion, Li-poly, or regulated 3.3V/5V system rails without pre-regulation. |
Applications
| RF Power Amplifier Bias | Low-Voltage Microcontroller Core |
|---|---|
|
Use Scenario: Providing clean, stable 1.05V bias to GaAs or SiGe RF power amplifiers in LTE/Wi-Fi front-end modules. IC Role / Device Role / Timing Role: Primary voltage regulation stage delivering low-noise, low-ripple DC bias independent of PA modulation envelope. Use Value: 60µVrms noise and 75dB PSRR prevent AM-to-PM distortion and maintain EVM performance under dynamic load conditions. |
Use Scenario: Supplying core voltage to ARM Cortex-M0+/M3 microcontrollers operating at 1.05V in ultra-low-power sensor nodes. IC Role / Device Role / Timing Role: Main system LDO generating processor VDD_CORE from shared 3.3V system rail with precise enable control for deep-sleep wake-up. Use Value: 35µA quiescent current and fast EN turn-on (<200µs) reduce system standby power and improve real-time responsiveness. |
| Camera Image Sensor Analog Rail | Wireless Adapter Baseband IC |
|
Use Scenario: Powering analog pixel array and column ADC circuitry in 1.05V-compatible CMOS image sensors. IC Role / Device Role / Timing Role: Dedicated low-noise analog supply LDO isolated from noisy digital domains using separate GND routing and local decoupling. Use Value: ±1% output accuracy and <30ppm/°C tempco ensure consistent ADC reference scaling and color fidelity across temperature. |
Use Scenario: Regulating 1.05V I/O or PLL supply for Wi-Fi/BT combo chips in USB dongles or embedded modules. IC Role / Device Role / Timing Role: Secondary LDO supplying clock generation and interface logic, synchronized to host enable signals via EN pin. Use Value: Built-in discharge clears residual charge before reconfiguration, preventing bus contention or latch-up during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-105I/TT (Microchip) | 1.05V fixed, 250mA, 6µVrms noise, no discharge, 65dB PSRR @ 1kHz | Lacks active discharge; lower current rating limits use in higher-load RF sections. | Select when ultra-low noise dominates over discharge need and load stays ≤250mA. |
| Torex XC6210B105MR-G (Torex) | 1.05V fixed, 300mA, 40µVrms noise, no discharge, 70dB PSRR @ 1kHz | Superior noise performance but no discharge path; SOT25 footprint identical but EN pin inactive (always-on). | Choose for lowest-noise analog rails where sequencing control is handled externally or unnecessary. |
Compared with MCP1703T-105I/TT and XC6210B105MR-G, the AP7343D-105W5-7 uniquely combines 300mA capability, integrated discharge, and balanced PSRR/noise trade-offs - making it optimal for compact, sequenced, multi-rail portable designs where both clean power and controlled shutdown are required.
Availability
AP7343D-105W5-7 is available at Aetrix Electronics and suitable for RF power amplifier biasing, low-voltage microcontroller cores, and camera image sensor analog rails requiring stable component supply, tight voltage tolerance, and reliable enable-controlled sequencing.
Supply support for AP7343D-105W5-7 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 high-performance power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP7343 series belongs to Diodes' high-PSRR, low-noise LDO product line, designed specifically for battery-powered portable electronics demanding precision regulation, minimal board area, and robust transient behavior under variable loads.
FAQ
What is the purpose of the NC pin (PIN5) on the AP7343D-105W5-7 SOT25 package?
PIN5 is a no-connect terminal with no internal bond wire or circuit connection. It serves only as a mechanical anchor for the package and may be left unconnected or tied to GND for improved thermal conduction or PCB mechanical stability - but it must never be used as a functional ground path or current-carrying node.
Does the AP7343D-105W5-7 require an external discharge resistor for safe shutdown?
No. The "D" suffix indicates integrated discharge functionality: when EN is pulled low, an internal 30Ω NMOS switch connects VOUT to GND, actively discharging output capacitance. This eliminates the need for external resistors and ensures rapid, predictable rail collapse during power sequencing.
Can the AP7343D-105W5-7 operate with input voltage below 1.7V?
No. The absolute minimum input voltage is 1.7V per datasheet specifications. Below this, the regulator cannot maintain regulation or guarantee specified performance - including output accuracy, PSRR, and dropout behavior. Operation at 1.65V or lower risks undervoltage lockout or unregulated output.
How does the thermal performance differ between SOT25 and X2-DFN1010-4 packages for this part?
In SOT25, θJA is 179°C/W; in X2-DFN1010-4 (Type B), it is 237°C/W - meaning the smaller DFN package runs hotter under identical ambient and power dissipation conditions. However, the DFN's exposed pad allows superior board-level thermal transfer when soldered to large copper areas, offsetting its higher θJA in well-designed layouts.
AP7343D-105W5-7 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):
- 1.05V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 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-105W5-7 FAQ
1.How can I place an order for AP7343D-105W5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7343D-105W5-7 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-105W5-7 reliable?
The price and inventory of AP7343D-105W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7343D-105W5-7 is usually 5 days.
3.What payment methods are accepted for AP7343D-105W5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7343D-105W5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7343D-105W5-7?
AP7343D-105W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7343D-105W5-7 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-105W5-7?
For technical support, including AP7343D-105W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7343D-105W5-7 requirements.
6.How does Aetrix verify that AP7343D-105W5-7 is sourced from the original manufacturer or authorized distributors?
All AP7343D-105W5-7 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-105W5-7 meets industry standards.
7.What is the process for return or replacement of AP7343D-105W5-7?
All AP7343D-105W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7343D-105W5-7, 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-105W5-7 part is unused and in its original packaging.
Return procedure for AP7343D-105W5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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