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Diodes Incorporated AP7347D-33FDZW-7B
- Part No.:
- AP7347D-33FDZW-7B
- Manufacturer:
- Diodes Incorporated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
AP7347D-33FDZW-7B.pdf
- Description:
- LDO CMOS LOWCURR W-DFN2020-6 T&R
- Quantity:
- Payment:
- Shipping:
Inventory:4,785
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Product details
Overview
AP7347D-33FDZW-7B from Diodes Incorporated is a 3.3V fixed-output, 500mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µVrms output noise (10Hz–100kHz). It features enable control, thermal shutdown, short-circuit protection, and auto-discharge functionality. Designed for noise-sensitive automotive and portable electronics, it operates from 1.7V to 5.5V input and delivers stable power to microcontrollers, sensors, and RF circuitry.
For engineers reviewing the AP7347D-33FDZW-7B datasheet, AP7347D-33FDZW-7B pinout, AP7347D-33FDZW-7B application, or AP7347D-33FDZW-7B equivalent, this page provides verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options for automotive-grade LDO selection.
Technical Context
The AP7347D-33FDZW-7B implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor. Its auto-discharge function uses a 30Ω internal N-channel switch between VOUT and GND when EN is low, ensuring rapid output discharge during shutdown.
It supports dual-package variants: SOT25 (Type A1) and W-DFN2020-6 (SWP) - the latter offering 54°C/W θJA and wettable flank geometry for automated optical inspection. The device meets AEC-Q200 stress test requirements via its automotive-qualified sibling AP7347DQ, though this variant (FDZW-7B) is industrial-grade with -40°C to +125°C operating ambient range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% - ensures precise rail generation for 3.3V logic, USB PHYs, and ADC references without external feedback. |
| Max Output Current | 500mA - sufficient to power mid-complexity SoCs, PMICs, or multi-rail subsystems from a single LDO stage. |
| PSRR | 75dB at 1kHz - suppresses switching noise from upstream DC/DC converters, critical for analog sensor signal chains. |
| Output Noise | 60µVrms (10Hz–100kHz) - enables clean biasing of RF front-ends and high-resolution ADCs without added filtering. |
| Quiescent Current | 60µA typical - extends battery life in always-on monitoring systems such as telematics or smart sensors. |
| Dropout Voltage | 0.27V max at 500mA (for 3.3V output) - allows operation down to 3.57V input, supporting single-cell Li-ion or 4-cell alkaline supplies. |
| Enable Threshold | VEN(H) ≥ 1.25V, VEN(L) ≤ 0.5V - compatible with 1.8V/3.3V GPIOs and supports direct MCU-controlled power sequencing. |
Pinout & Package
AP7347D-33FDZW-7B is packaged in the W-DFN2020-6 (SWP) Type A1 wettable flank package (2.0mm × 2.0mm × 0.75mm), optimized for space-constrained PCBs and automated optical inspection. The exposed pad (EP) must be connected to GND via large copper area for thermal dissipation but not used as sole GND electrode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOUT | Regulated 3.3V output - requires local 1µF ceramic capacitor within 2mm of pin for stability and transient response. |
| 2, 5 | NC | No-connect terminals - internally unconnected; recommended to tie to GND for improved thermal conduction and EMI shielding. |
| 3 | GND | Analog/digital ground reference - must connect directly to low-impedance ground plane; shared with EP thermal pad. |
| 4 | EN | Active-high enable - drives regulator ON/OFF; floating state prohibited; 1µA leakage ensures low-power shutdown. |
| 6 | VIN | Input supply (1.7–5.5V) - requires 1µF ceramic decoupling capacitor placed adjacent to pin to suppress supply glitches. |
| EP | Exposed Pad | Thermal interface only - not electrically functional; must be soldered to ≥10mm² GND copper for θJA = 54°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | 30Ω internal N-channel switch discharges VOUT to GND in <100µs upon EN deactivation - prevents back-powering or latch-up in multi-rail systems. |
| Low-noise CMOS design | 60µVrms noise floor enables direct powering of 16-bit SAR ADCs and GHz-range RF synthesizers without post-regulation filtering. |
| High PSRR across frequency | 75dB at 1kHz and >50dB up to 100kHz - maintains signal integrity when co-located with noisy buck converters on shared PCBs. |
| Wide input voltage range | 1.7V–5.5V operation supports direct regulation from LiFePO₄ (3.2V), single Li-ion (4.2V), or 5V USB sources without pre-buck stages. |
| Thermal shutdown with hysteresis | +170°C trip threshold with +20°C hysteresis - prevents thermal runaway during sustained overload while enabling automatic recovery after cooling. |
Applications
| Automotive Telematics Module | Industrial IoT Sensor Node |
|---|---|
|
Use Scenario: Powering GPS/GNSS receiver, cellular modem, and CAN transceiver in a compact vehicle tracking unit. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying noise-sensitive RF and digital logic blocks; sequenced via MCU GPIO. Use Value: 75dB PSRR rejects switching noise from 2MHz buck converter feeding the module, preserving GNSS C/N₀ ratio and LTE sensitivity. |
Use Scenario: Regulating power for ultra-low-power ARM Cortex-M0+ MCU, MEMS accelerometer, and LoRaWAN transceiver in battery-operated field sensor. IC Role / Device Role / Timing Role: Always-on 3.3V rail with 60µA quiescent current; enabled only during wake-up bursts to extend 10-year battery life. Use Value: Auto-discharge eliminates residual VOUT hold-up that could prevent clean MCU reset or cause I²C bus contention during deep sleep transitions. |
| Medical Wearable Display | Smart Home Hub Audio Codec |
|
Use Scenario: Supplying OLED display driver IC and optical heart-rate sensor ASIC in a wrist-worn health monitor. IC Role / Device Role / Timing Role: Low-noise 3.3V source for analog front-end and display bias; thermally coupled to aluminum housing via EP pad. Use Value: 60µVrms noise floor avoids visible banding on OLED panels and preserves SNR in photoplethysmography (PPG) signal acquisition. |
Use Scenario: Providing clean 3.3V supply to stereo audio codec and DSP in a voice-controlled smart speaker base station. IC Role / Device Role / Timing Role: Secondary LDO isolated from noisy 5V SMPS rail; enables independent power cycling of audio subsystem. Use Value: ±1% output accuracy ensures consistent DAC reference voltage, maintaining THD+N < -95dB across production units without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-3302E/MB | 3.3V ±2% accuracy, 250mA max, 65dB PSRR @ 1kHz, no auto-discharge | Lacks discharge path; unsuitable for systems requiring fast VOUT collapse during shutdown | Lower cost option where discharge is unnecessary and load current ≤250mA |
| TLD1135F-33 | 3.3V ±1.5%, 500mA, 70dB PSRR @ 1kHz, integrated reverse-polarity protection | Includes reverse-voltage protection (−20V tolerant); higher quiescent current (120µA) | Preferred for automotive body electronics where battery reversal risk exists, despite higher IQ |
Compared with MCP1703T-3302E/MB and TLD1135F-33, AP7347D-33FDZW-7B uniquely combines 500mA capability, ±1% accuracy, 75dB PSRR, and active auto-discharge in a 2mm×2mm wettable flank package - making it optimal for space-constrained, noise-critical, and fast-sequencing applications where VOUT collapse timing matters.
Availability
AP7347D-33FDZW-7B is available at Aetrix Electronics and suitable for automotive telematics, industrial IoT sensor nodes, medical wearables, and smart home audio systems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AP7347D-33FDZW-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 company specializing in discrete, analog, and mixed-signal solutions, with emphasis on power management, signal integrity, and connectivity products for industrial, automotive, and consumer markets.
The AP7347D series belongs to Diodes' high-PSRR, low-noise LDO portfolio designed specifically for noise-sensitive applications in automotive infotainment, ADAS camera modules, and portable medical devices requiring precision voltage regulation.
FAQ
What is the maximum allowable input voltage for AP7347D-33FDZW-7B?
The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.5V. Exceeding 5.5V risks permanent damage per Absolute Maximum Ratings. For 3.3V output, minimum dropout is 0.27V, so VIN must remain ≥3.57V under full 500mA load to maintain regulation.
Does AP7347D-33FDZW-7B require an external discharge resistor?
No. The device integrates a 30Ω N-channel MOSFET between VOUT and GND that activates automatically when EN is pulled low. This eliminates need for external discharge components and ensures VOUT collapses within 100µs, preventing back-powering of upstream circuitry.
Can AP7347D-33FDZW-7B be used in automotive applications?
This specific variant (FDZW-7B) is industrial-grade rated (−40°C to +125°C ambient), not AEC-Q200 qualified. For automotive use, Diodes offers the AP7347DQ series - identical electrical specs but with extended reliability testing, PPAP documentation, and automotive-grade traceability.
What is the thermal resistance of the W-DFN2020-6 package?
The W-DFN2020-6 (SWP) package has θJA = 54°C/W and θJC = 20°C/W when mounted on a standard JEDEC 4-layer board with 1oz copper and 2oz top/bottom traces. Full thermal performance requires connecting the exposed pad (EP) to ≥10mm² GND copper area.
AP7347D-33FDZW-7B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.32V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 125 µA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (1kHz)
- Control Features:
- Current Limit, Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- W-DFN2020-6 (SWP) (Type A1)
AP7347D-33FDZW-7B FAQ
1.How can I place an order for AP7347D-33FDZW-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7347D-33FDZW-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 AP7347D-33FDZW-7B reliable?
The price and inventory of AP7347D-33FDZW-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7347D-33FDZW-7B is usually 5 days.
3.What payment methods are accepted for AP7347D-33FDZW-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7347D-33FDZW-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7347D-33FDZW-7B?
AP7347D-33FDZW-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7347D-33FDZW-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 AP7347D-33FDZW-7B?
For technical support, including AP7347D-33FDZW-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7347D-33FDZW-7B requirements.
6.How does Aetrix verify that AP7347D-33FDZW-7B is sourced from the original manufacturer or authorized distributors?
All AP7347D-33FDZW-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 AP7347D-33FDZW-7B meets industry standards.
7.What is the process for return or replacement of AP7347D-33FDZW-7B?
All AP7347D-33FDZW-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7347D-33FDZW-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 AP7347D-33FDZW-7B part is unused and in its original packaging.
Return procedure for AP7347D-33FDZW-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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