Diodes Incorporated AP7343-32W5-7

Overview

AP7343-32W5-7 from Diodes Incorporated is a 300mA, 3.2V fixed-output 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 features enable control, thermal shutdown, and short-circuit protection-designed for RF supply rails in portable media players and wireless adapters.

For engineers reviewing the AP7343-32W5-7 datasheet, AP7343-32W5-7 pinout, AP7343-32W5-7 application, or AP7343-32W5-7 equivalent, key selection criteria include dropout voltage (≤290mV @ 300mA), quiescent current (35–60µA), EN logic thresholds (0.5V_IL/1.3V_IH), and thermal resistance (179°C/W in SOT25).

Technical Context

The AP7343-32W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor with CMOS control logic. Its enable input directly controls gate biasing of the pass device, enabling fast turn-on/turn-off transitions (<100µs) and ultra-low standby current (≤1.0µA).

It delivers stable 3.2V output across –40°C to +85°C ambient, with load regulation ≤30mV (1mA–300mA) and line regulation ≤0.1%/V. Thermal shutdown activates at +150°C with +20°C hysteresis, and short-circuit current is limited to ~55mA.

Key Specifications

Pinout & Package

AP7343-32W5-7 uses the SOT25 (5-pin) package-compact, surface-mount, and optimized for thermal performance (R_θJA = 179°C/W). The exposed pad (EP) must be connected to GND via large copper area for effective heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-3202E/MB and XC6210B322MR-G, the AP7343-32W5-7 offers superior PSRR (75dB vs. ≤70dB), tighter output accuracy (±1% vs. ±2%), and lower noise-making it the preferred choice for RF and high-fidelity audio supply rails where signal integrity is critical.

Availability

AP7343-32W5-7 is available at Aetrix Electronics and suitable for RF power amplifier supplies, camera sensor core rails, wireless adapter baseband subsystems, and portable media player audio codecs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7343-32W5-7 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 connectivity solutions for consumer, industrial, and automotive markets.

The AP7343 series belongs to Diodes' high-PSRR, low-noise LDO portfolio-engineered specifically for noise-sensitive portable electronics where battery efficiency and signal purity are co-constrained design priorities.

FAQ

What is the minimum input voltage required for AP7343-32W5-7 to regulate 3.2V output at full 300mA load?

The minimum input voltage is determined by dropout voltage: at 300mA, max dropout is 290mV in SOT25. Therefore, VIN(min) = 3.2V + 0.29V = 3.49V. Operation below this causes output collapse. Datasheet specifies absolute min VIN = 1.7V, but regulation only occurs above dropout margin.

Can AP7343-32W5-7 be used without an external output capacitor?

No. The AP7343-32W5-7 requires ≥1µF ceramic output capacitor for stability and transient response. Omitting C_OUT risks oscillation, excessive overshoot/undershoot during load steps, and failure to meet PSRR/noise specs. Layout guidelines mandate placing it adjacent to VOUT and GND pins.

Is the EN pin internally pulled up or down? What happens if left floating?

The EN pin has no internal pull-up or pull-down. If left floating, the regulator enters undefined state-potentially oscillating or latching unpredictably. Datasheet explicitly prohibits floating EN. For default-ON operation, tie EN directly to VIN; for controlled enable, drive with clean logic signal meeting V_IL ≤0.5V and V_IH ≥1.3V.

Does AP7343-32W5-7 include output discharge functionality?

No. Per ordering code "AP7343-32W5-7", the "7" suffix indicates standard (non-discharge) version. Discharge variants use "D" prefix (e.g., AP7343D-32W5-7) and integrate an NMOS switch to actively discharge VOUT when disabled. This part relies on natural discharge through load or external bleeder resistor.