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Diodes Incorporated AP7343-33FS4-7B
- Part No.:
- AP7343-33FS4-7B
- Manufacturer:
- Diodes Incorporated
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AP7343-33FS4-7B.pdf
- Description:
- IC REG LINEAR 3.3V 300MA 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,628
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Product details
Overview
AP7343-33FS4-7B from Diodes Incorporated is a 300mA, 3.3V fixed-output low-dropout (LDO) regulator in X2-DFN1010-4 (Type B) package, featuring ±1% output voltage accuracy, 75dB PSRR at 1kHz, 60µVrms output noise (10Hz–100kHz), and 35µA quiescent current. It integrates enable control, thermal shutdown, and current limiting, and is optimized for RF supply rails in compact portable electronics.
For engineers reviewing the AP7343-33FS4-7B datasheet, AP7343-33FS4-7B pinout, AP7343-33FS4-7B application, or AP7343-33FS4-7B equivalent, key selection criteria include dropout voltage at 300mA (0.22–0.29V), EN logic thresholds (0.5V low / 1.3V high), thermal resistance (237°C/W J-A), and compatibility with 1µF ceramic input/output capacitors.
Technical Context
The AP7343-33FS4-7B employs a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its enable input (EN) provides precise on/off control with defined logic thresholds and sub-1µA standby current, supporting power sequencing in multi-rail systems.
It delivers stable 3.3V regulation across 1.7V–5.25V input range and –40°C to +85°C ambient, with thermal shutdown triggered at +150°C and 20°C hysteresis. The device exhibits fast load transient response (<100µs settling time) and maintains stability with minimal 1µF ceramic output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% at +25°C; ensures reliable logic-level compliance for 3.3V I/O domains. |
| Max Output Current | 300mA guaranteed; supports moderate-power RF ICs, sensors, and MCU peripherals without derating. |
| Dropout Voltage | 0.22–0.29V at 300mA (X2-DFN1010-4); enables operation from 3.52V input while maintaining regulation. |
| PSRR | 75dB at 1kHz; suppresses switching noise from adjacent DC/DC converters feeding shared input rails. |
| Output Noise | 60µVrms (10Hz–100kHz); minimizes jitter in clock-sensitive analog/RF circuits like PLLs and ADCs. |
| Quiescent Current | 35µA typical; extends battery life in always-on sensor nodes and low-duty-cycle wireless transceivers. |
| Enable Thresholds | VEN(HI) ≥ 1.3V, VEN(LO) ≤ 0.5V; compatible with 1.8V/3.3V GPIO without level-shifting. |
Pinout & Package
X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm, 0.4mm pitch, exposed thermal pad (EP) - recommended to connect to GND plane for optimal thermal performance (RθJA = 237°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN1 (VOUT) | Regulated Power Output | Delivers clean 3.3V to load; requires local 1µF ceramic capacitor placed adjacent to pin and GND. |
| PIN2 (GND) | Ground Reference | Primary return path for output current and internal bias; must connect directly to low-impedance ground plane. |
| PIN3 (EN) | Enable Control Input | Active-high digital control: >1.3V enables regulation, <0.5V forces shutdown with 0.01µA standby current. |
| PIN4 (VIN) | Unregulated Input Supply | Accepts 1.7–5.25V; requires 0.47µF ceramic decoupling capacitor placed within 2mm of this pin. |
| EP (Exposed Pad) | Thermal Dissipation Path | Not electrically functional; soldered to GND copper area to reduce junction temperature rise by up to 40°C. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 60µVrms (10Hz–100kHz) enables use in RF front-end biasing and precision analog signal chains. |
| High PSRR at audio frequencies | 75dB rejection at 1kHz allows co-location with noisy buck converters without additional filtering. |
| Low-quiescent-current enable | 0.01µA shutdown current supports multi-year battery life in IoT endpoint devices. |
| Thermal protection with hysteresis | +150°C trip point with +20°C hysteresis prevents thermal cycling during sustained overload conditions. |
| Small-footprint DFN packaging | 1.0mm × 1.0mm X2-DFN1010-4 reduces PCB area by >60% vs. SOT25, enabling ultra-dense mobile layouts. |
Applications
| RF Power Amplifier Bias | Mobile Camera Sensor Core Supply |
|---|---|
|
Use Scenario: Providing clean, low-noise bias to GaAs or SiGe RF power amplifiers in LTE/5G front-end modules. IC Role / Device Role / Timing Role: LDO regulator delivering stable 3.3V with minimal ripple-induced AM-to-PM distortion. Use Value: 60µVrms noise and 75dB PSRR prevent EVM degradation and maintain ACLR compliance under dynamic PA load. |
Use Scenario: Powering high-resolution CMOS image sensor cores (e.g., 12MP+) in smartphones and tablets. IC Role / Device Role / Timing Role: Primary core voltage regulator with fast load transient response to handle pixel readout bursts. Use Value: <100µs settling time and ±1% accuracy ensure consistent analog gain and reduced fixed-pattern noise. |
| Wireless Communication SoC I/O Rail | Portable Media Player Audio Codec Supply |
|
Use Scenario: Supplying 3.3V I/O domain for Wi-Fi/BT combo chips requiring strict voltage tolerance and low EMI. IC Role / Device Role / Timing Role: Dedicated LDO for digital interface rails (SDIO, UART, SPI), isolated from noisy system supplies. Use Value: 0.22V dropout enables direct regulation from single-cell Li-ion (3.6V nominal), reducing BOM count. |
Use Scenario: Delivering ultra-low-noise 3.3V to stereo audio codecs and DACs in portable media players. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from digital subsystems via dedicated LDO. Use Value: 60µVrms noise translates to >105dB SNR, meeting Hi-Res Audio certification requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-3302E/TO | 250mA max output, 6µVrms noise, but only 60dB PSRR at 1kHz and 400mV dropout at 250mA. | Limited to lower-current analog rails; insufficient PSRR for RF supply isolation. | Choose when ultra-low noise dominates over PSRR and current capability. |
| Torex XC6210B332MR-G | 300mA output, 40µVrms noise, 70dB PSRR at 1kHz, but requires 2.2µF min COUT and lacks EN pin. | Not suitable for sequenced power-up or battery-powered shutdown modes. | Prefer when lowest possible noise is critical and enable control is unnecessary. |
Compared with MCP1700-3302E/TO and XC6210B332MR-G, the AP7343-33FS4-7B uniquely balances 300mA drive, 75dB PSRR, 60µVrms noise, and active enable control in a 1.0mm² footprint-making it optimal for space-constrained, multi-rail RF and imaging systems requiring both performance and flexibility.
Availability
AP7343-33FS4-7B is available at Aetrix Electronics and suitable for RF power amplifier biasing, mobile camera sensor core supply, and wireless communication SoC I/O rail applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AP7343-33FS4-7B 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 noise-sensitive applications in portable communications equipment where small size, efficiency, and signal integrity are critical.
FAQ
What is the minimum input voltage required for the AP7343-33FS4-7B to regulate 3.3V at 300mA?
The minimum input voltage is determined by dropout: at 300mA, maximum dropout is 0.29V for the X2-DFN1010-4 package. Therefore, VIN must be ≥ 3.59V (3.3V + 0.29V) to maintain regulation. The absolute minimum specified VIN is 1.7V, but that only applies at lighter loads.
Can the AP7343-33FS4-7B be used without an enable signal?
Yes - the EN pin must not be left floating. To operate continuously, tie EN directly to VIN. This ensures the regulator remains enabled at all times, with no risk of unintended shutdown due to leakage or noise coupling.
Is the exposed pad (EP) electrically connected internally?
No - the EP is a thermal pad only, with no internal electrical connection. It must be soldered to a GND copper pour for thermal performance, but should not be used as the sole GND connection; PIN2 (GND) remains the primary signal ground reference.
Does the AP7343-33FS4-7B include output discharge functionality?
No - the "7B" suffix indicates non-discharge version. The AP7343D-33FS4-7B variant includes an internal NMOS discharge switch (30Ω typical) between VOUT and GND when disabled. For rapid VOUT decay during shutdown, select the "D" variant.
AP7343-33FS4-7B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-XDFN Exposed Pad
- 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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.29V @ 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:
- X2-DFN1010-4
AP7343-33FS4-7B FAQ
1.How can I place an order for AP7343-33FS4-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7343-33FS4-7B 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 AP7343-33FS4-7B reliable?
The price and inventory of AP7343-33FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7343-33FS4-7B is usually 5 days.
3.What payment methods are accepted for AP7343-33FS4-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7343-33FS4-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7343-33FS4-7B?
AP7343-33FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7343-33FS4-7B 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 AP7343-33FS4-7B?
For technical support, including AP7343-33FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7343-33FS4-7B requirements.
6.How does Aetrix verify that AP7343-33FS4-7B is sourced from the original manufacturer or authorized distributors?
All AP7343-33FS4-7B 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 AP7343-33FS4-7B meets industry standards.
7.What is the process for return or replacement of AP7343-33FS4-7B?
All AP7343-33FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7343-33FS4-7B, 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 AP7343-33FS4-7B part is unused and in its original packaging.
Return procedure for AP7343-33FS4-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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