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Diodes Incorporated AP7343D-19FS4-7B
- Part No.:
- AP7343D-19FS4-7B
- Manufacturer:
- Diodes Incorporated
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AP7343D-19FS4-7B.pdf
- Description:
- IC REG LINEAR 1.9V 300MA 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,167
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Product details
Overview
AP7343D-19FS4-7B from Diodes Incorporated is a 300mA, 1.9V fixed-output low-dropout linear regulator with high PSRR (75dB at 1kHz), ultra-low output noise (60µVrms, 10Hz–100kHz), and ±1% output voltage accuracy. Fabricated on a CMOS process, it features enable control, thermal shutdown, short-circuit protection, and operates from 1.7V to 5.25V input - optimized for RF supply rails in compact portable devices.
For engineers reviewing the AP7343D-19FS4-7B datasheet, AP7343D-19FS4-7B pinout, AP7343D-19FS4-7B application, or AP7343D-19FS4-7B equivalent, key selection criteria include its 1.9V fixed output, X2-DFN1010-4 (Type B) package with exposed pad, 35µA quiescent current, and discharge functionality enabled by the "D" suffix - critical for fast VOUT discharge during shutdown in battery-powered systems.
Technical Context
The AP7343D-19FS4-7B integrates a precision voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor with built-in auto-discharge path. Its CMOS architecture enables low quiescent current (35µA typ.) while maintaining fast load transient response and stable operation with 1µF ceramic output capacitors.
Unlike non-discharge variants, the "D" version includes an internal N-channel MOSFET (RON ≈ 30Ω) between VOUT and GND, activated when EN is low - ensuring rapid output discharge (<100µs typical) to prevent back-powering or latch-up in multi-rail systems. Thermal shutdown triggers at +150°C with +20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.9V ±1% at TA = +25°C - ensures stable bias for RF transceivers and low-voltage logic without external feedback. |
| Max Output Current | 300mA continuous - supports moderate-power analog/RF blocks such as LNA stages or camera sensor interfaces. |
| PSRR | 75dB at 1kHz - suppresses switching noise from adjacent DC-DC converters feeding noisy system rails. |
| Output Noise | 60µVrms (10Hz–100kHz) - minimizes phase noise degradation in VCOs and PLLs powered from this rail. |
| Quiescent Current | 35µA typical - extends battery life in always-on subsystems like Bluetooth LE receivers or sensor hubs. |
| Dropout Voltage | 0.35V max at 300mA (VOUT = 1.9V) - enables operation from single-cell Li-ion (3.0V min) with >1.1V headroom. |
| Enable Threshold | VIL ≤ 0.5V, VIH ≥ 1.3V - compatible with 1.8V/3.3V GPIO without level-shifting in modern SoC platforms. |
Pinout & Package
X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm, 0.4mm pitch, 4-pin DFN with exposed thermal pad (EP). Requires PCB copper area under EP connected to GND for optimal thermal performance (RθJA = 237°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN1 (VOUT) | Regulated power output | Delivers clean 1.9V to load; connects directly to local 1µF ceramic capacitor and target IC VDD pin. |
| PIN2 (GND) | Analog/digital ground reference | Low-impedance return path; must be tied to main system GND plane with minimal trace length. |
| PIN3 (EN) | Active-high enable control | Drives high (>1.3V) to activate regulator; pulled low (<0.5V) to disable and engage auto-discharge. |
| PIN4 (VIN) | Unregulated input supply | Accepts 1.7–5.25V; requires 0.47µF ceramic decoupling capacitor placed within 2mm of pin. |
| EP (Exposed Pad) | Thermal dissipation node | Not electrically functional as GND; soldered to large copper pour for thermal conduction - improves power handling by ~30%. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Internal 30Ω NMOS discharges VOUT to <100mV within 100µs after EN deactivation - prevents backfeed into powered-down circuits. |
| High PSRR at low frequency | 75dB @ 1kHz - rejects ripple from buck converter switching frequencies and their harmonics without additional LC filtering. |
| Ultra-low noise output | 60µVrms broadband noise - meets stringent spectral purity requirements for RF front-end biasing (e.g., LTE/5G PA drivers). |
| Wide input voltage range | 1.7V to 5.25V - supports direct connection to single-cell Li-ion, USB VBUS, or intermediate buck outputs. |
| ±1% output accuracy | Guaranteed over -40°C to +85°C - eliminates need for post-production calibration in consumer-grade portable designs. |
Applications
| RF Power Amplifier Bias | Camera Sensor Core Supply |
|---|---|
|
Use Scenario: Providing clean, stable bias to GaAs or SiGe RF power amplifiers in smartphones and IoT modems. IC Role / Device Role / Timing Role: Low-noise LDO delivering 1.9V at up to 300mA with fast transient response to handle PA burst-mode current demands. Use Value: 60µVrms noise prevents AM-to-PM distortion; 75dB PSRR isolates PA from noisy PMIC switcher outputs. |
Use Scenario: Powering image sensor analog core (ADC reference, pixel array bias) in mobile cameras and automotive ADAS modules. IC Role / Device Role / Timing Role: Fixed 1.9V regulator with ±1% accuracy and low thermal drift (±30ppm/°C) for consistent sensor gain and linearity. Use Value: Enables <1 LSB INL error in 12-bit image sensors; auto-discharge prevents residual charge from corrupting next frame startup. |
| Bluetooth LE Audio Codec Supply | Wearable MCU Core Rail |
|
Use Scenario: Supplying low-noise VDD to Bluetooth audio codecs and DACs in true wireless stereo earbuds. IC Role / Device Role / Timing Role: 1.9V LDO with 35µA IQ and fast enable/disable timing for dynamic power gating during audio packet intervals. Use Value: Extends battery runtime by >15% vs. higher-IQ regulators; discharge function eliminates pop/click artifacts during codec reset. |
Use Scenario: Delivering regulated 1.9V to ARM Cortex-M0+/M4 cores in compact wearables and medical patches. IC Role / Device Role / Timing Role: Compact X2-DFN1010-4 LDO enabling dense PCB layouts; thermal shutdown protects against enclosure overheating. Use Value: 1.0mm × 1.0mm footprint saves >60% board area vs. SOT25; RθJC = 96°C/W allows 250mA continuous at 65°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7361D-19FS4-7B | 600mA rated output, higher dropout (0.45V @ 600mA), same 1.9V ±1% accuracy and discharge function. | Better suited for higher-current loads (e.g., multi-core MCUs), but larger thermal footprint required. | Select when peak load exceeds 300mA and board layout accommodates higher power dissipation. |
| Torex XC6219B192MR-G | 300mA, 1.9V ±2% accuracy, no auto-discharge, 50µVrms noise, SOT-25 package only. | Lacks discharge path; requires external FET for VOUT bleed-down - increases BOM count and layout complexity. | Choose only if discharge is unnecessary and SOT-25 mechanical compatibility is mandatory. |
Compared with AP7343D-19FS4-7B, the AP7361D-19FS4-7B trades smaller size for higher current capability, while the XC6219B192MR-G sacrifices discharge functionality and accuracy for legacy package support - making the AP7343D-19FS4-7B optimal for space-constrained, battery-sensitive RF applications requiring guaranteed fast shutdown discharge.
Availability
AP7343D-19FS4-7B is available at Aetrix Electronics and suitable for RF power amplifier bias, camera sensor core supply, Bluetooth LE audio codec supply, and wearable MCU core rail applications requiring stable component supply, automotive-grade reliability (via AP7343Q variant), and long-term lifecycle continuity.
Supply support for AP7343D-19FS4-7B 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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions, with leadership in power management, signal integrity, and connectivity products.
The AP7343 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for noise-sensitive, battery-operated portable electronics where ultra-low IQ, high PSRR, and fast discharge are essential design requirements.
FAQ
What is the purpose of the exposed pad (EP) on the X2-DFN1010-4 package?
The exposed pad is a thermal interface, not an electrical terminal. It must be soldered to a PCB copper area connected to GND to dissipate heat - reducing junction temperature by up to 40°C at 300mA. Using it solely as a GND electrode without thermal connection degrades reliability and violates JEDEC thermal test conditions.
Does the "D" in AP7343D-19FS4-7B affect electrical specifications beyond discharge functionality?
No - all electrical parameters (output accuracy, PSRR, noise, dropout, IQ) match the non-D AP7343-19FS4-7B. The "D" denotes only the presence of the internal discharge FET (RON ≈ 30Ω); no other specs differ. Discharge activation occurs automatically when EN is driven below 0.5V.
Can AP7343D-19FS4-7B operate with only a 0.47µF input capacitor?
Yes - the datasheet specifies a minimum 0.47µF ceramic capacitor between VIN and GND. This value ensures stability during load transients and suppresses high-frequency noise. For systems with aggressive load steps (>100mA/µs), adding a 2.2µF bulk capacitor in parallel is recommended.
How does the AP7343D-19FS4-7B behave during thermal shutdown?
When junction temperature reaches +150°C, the regulator disables output and holds VOUT at 0V until temperature drops by ≥20°C (hysteresis). During shutdown, quiescent current remains at 1.0µA max, and EN retains full control - allowing immediate re-enable once thermal margin is restored.
AP7343D-19FS4-7B 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):
- 1.9V
- 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:
- X2-DFN1010-4
AP7343D-19FS4-7B FAQ
1.How can I place an order for AP7343D-19FS4-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7343D-19FS4-7B 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 AP7343D-19FS4-7B reliable?
The price and inventory of AP7343D-19FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7343D-19FS4-7B is usually 5 days.
3.What payment methods are accepted for AP7343D-19FS4-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7343D-19FS4-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7343D-19FS4-7B?
AP7343D-19FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7343D-19FS4-7B 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 AP7343D-19FS4-7B?
For technical support, including AP7343D-19FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7343D-19FS4-7B requirements.
6.How does Aetrix verify that AP7343D-19FS4-7B is sourced from the original manufacturer or authorized distributors?
All AP7343D-19FS4-7B 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 AP7343D-19FS4-7B meets industry standards.
7.What is the process for return or replacement of AP7343D-19FS4-7B?
All AP7343D-19FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7343D-19FS4-7B, 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 AP7343D-19FS4-7B part is unused and in its original packaging.
Return procedure for AP7343D-19FS4-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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