Diodes Incorporated AP7343D-26FS4-7B

Overview

AP7343D-26FS4-7B from Diodes Incorporated is a 300mA, 2.6V 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 short-circuit protection, and is optimized for RF supply rails in compact portable electronics.

For engineers reviewing the AP7343D-26FS4-7B datasheet, AP7343D-26FS4-7B pinout, AP7343D-26FS4-7B application, or AP7343D-26FS4-7B equivalent, key selection criteria include dropout voltage at 300mA (0.22–0.29V for 2.6V output), EN logic thresholds (0–0.5V low, 1.3–5.25V high), thermal resistance (θ_JA = 237°C/W), and discharge functionality enabled by the "D" suffix.

Technical Context

The AP7343D employs a CMOS-based architecture with integrated voltage reference, error amplifier, current limit circuit, and active discharge path activated during shutdown. Its internal N-channel transistor provides auto-discharge (R_ON ≈ 30Ω at V_IN = 4.0V), enabling rapid V_OUT decay to prevent back-powering of downstream circuitry.

Designed for stable operation with 1µF ceramic input/output capacitors, it delivers fast load transient response (±30mV deviation under 1mA ↔ 300mA step) and maintains regulation across –40°C to +85°C ambient, with thermal shutdown triggered at +150°C and 20°C hysteresis.

Key Specifications

Pinout & Package

X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm, 0.4mm pitch, exposed pad (EP) for thermal dissipation. Recommended PCB layout uses large copper area connected to GND under EP.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7343-26FS4-7B and XC6210B262MR-G, the AP7343D-26FS4-7B uniquely combines 300mA capability, 2.6V precision, auto-discharge, and industry-leading 75dB PSRR in a 1.0mm² footprint-making it optimal for RF and high-fidelity portable audio power domains.

Availability

AP7343D-26FS4-7B is available at Aetrix Electronics and suitable for RF power amplifiers, camera sensor cores, wireless adapter I/O rails, and portable media player audio codecs requiring stable component supply across high-volume consumer production.

Supply support for AP7343D-26FS4-7B 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.

The AP7343 series targets ultra-low-noise, high-PSRR LDO applications in battery-powered portable electronics-designed to replace legacy regulators where RF sensitivity, thermal density, and fast transient response are critical.

FAQ

What is the purpose of the "D" suffix in AP7343D-26FS4-7B?

The "D" denotes integrated auto-discharge functionality: when the EN pin is pulled low, an internal 30Ω N-channel MOSFET actively discharges the VOUT capacitor to <100mV within 100µs. This prevents back-powering of upstream circuitry or latch-up in multi-rail systems, eliminating need for external discharge resistors.

Can AP7343D-26FS4-7B operate from a single-cell Li-ion battery?

Yes. With a 1.7–5.25V input range and 2.6V output, it operates across the full Li-ion discharge curve (4.2V → 2.7V). At 300mA load, its 0.22–0.29V dropout allows regulation down to 2.82V input-supporting >95% of battery capacity before undervoltage cutoff.

How does the X2-DFN1010-4 (Type B) package affect thermal performance?

This 1.0mm × 1.0mm package has θ_JA = 237°C/W (JEDEC standard board). Effective thermal management requires soldering the exposed pad to a ≥4mm² GND copper area. Without this, junction temperature rise exceeds safe limits at 300mA; with proper layout, T_J stays <100°C at +85°C ambient.

Is AP7343D-26FS4-7B suitable for powering RF synthesizers?

Yes. Its 60µV_rms output noise (10Hz–100kHz) and 75dB PSRR at 1kHz directly suppress supply-induced phase noise in VCOs and PLLs. Measured load transient response shows <±30mV deviation under 300mA steps-critical for maintaining spectral purity in LTE/5G local oscillators.