Diodes Incorporated AP7347D-22FDZW-7B

Overview

AP7347D-22FDZW-7B from Diodes Incorporated is a 2.2V fixed-output, 500mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). Built on a CMOS process, it integrates enable control, thermal shutdown, current limiting, and auto-discharge functionality. It powers noise-sensitive analog rails in automotive infotainment systems where stable 2.2V supply under fast load transients is required.

For engineers reviewing the AP7347D-22FDZW-7B datasheet, AP7347D-22FDZW-7B pinout, AP7347D-22FDZW-7B application, or AP7347D-22FDZW-7B equivalent, key selection criteria include its W-DFN2020-6 wettable flank package, 0.32V max dropout at 500mA (for V_OUT = 2.2V), 60µA quiescent current, and guaranteed operation from –40°C to +125°C ambient.

Technical Context

The AP7347D-22FDZW-7B implements a CMOS-based LDO architecture with an internal voltage reference, error amplifier, and N-channel pass transistor. Its enable input controls regulator state with defined logic thresholds (V_EN(H) ≥ 1.25V, V_EN(L) ≤ 0.5V) and <1µA leakage.

It features integrated short-circuit protection (foldback current limit ≈ 180mA), thermal shutdown at +170°C with +20°C hysteresis, and auto-discharge via a 30Ω internal N-channel switch when disabled. Stability is ensured with 1µF ceramic input/output capacitors.

Key Specifications

Pinout & Package

AP7347D-22FDZW-7B uses the W-DFN2020-6 (SWP) Type A1 wettable flank package (2.0mm × 2.0mm, 0.75mm height), optimized for automated optical inspection and high-density PCB layouts. The exposed pad (EP) must be connected to GND for thermal performance but not used as sole GND electrode.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with AP7347D-22FDZW-7B, AP7361D-22FDZW-7B trades higher current for reduced noise rejection, while XC6210B222MR-G sacrifices automotive-grade packaging, discharge, and PSRR for lower cost and smaller footprint in non-critical applications.

Availability

AP7347D-22FDZW-7B is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, portable medical diagnostics, and smart building controllers requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AP7347D-22FDZW-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 ICs for automotive, industrial, computing, and consumer markets, with ISO/TS 16949-certified manufacturing.

The AP7347D series belongs to Diodes' high-PSRR, low-noise LDO product line, designed specifically for noise-sensitive automotive and industrial applications demanding precision voltage regulation under wide temperature and load conditions.

FAQ

What is the maximum input voltage for AP7347D-22FDZW-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 2.2V output, minimum functional input is 2.52V (accounting for 0.32V max dropout at 500mA), ensuring reliable regulation across temperature and load.

Does AP7347D-22FDZW-7B require an external pull-up on the EN pin?

No external pull-up is required. The EN pin has no internal pull-up; it must be actively driven high (≥1.25V) to enable or low (≤0.5V) to disable. Leaving it floating violates the "must not be floating" requirement and may cause erratic operation. If unused, tie EN directly to VIN to maintain constant ON state.

Can AP7347D-22FDZW-7B be used in AEC-Q200 qualified designs?

The AP7347D-22FDZW-7B itself is not AEC-Q200 certified; however, the automotive-grade variant AP7347DQ is explicitly qualified per AEC-Q200 Rev D. This part shares identical electrical specs and W-DFN2020-6 packaging but undergoes additional stress testing. Use AP7347DQ for production automotive applications requiring qualification evidence.

What is the purpose of the NC pins in the W-DFN2020-6 package?

Pins 2 and 5 are No-Connect terminals-internally unconnected-and serve solely as thermal and mechanical reliefs. Diodes recommends connecting them to GND to maximize PCB copper area for heat spreading and EMI reduction. They provide no electrical function but improve thermal resistance (θ_JA = 54°C/W) and board-level robustness.