Diodes Incorporated AP7383-44W5-7

Overview

AP7383-44W5-7 from Diodes Incorporated is a fixed-output 4.4V, 150mA ultra-low dropout (ULDO) linear regulator in SOT25 package, featuring 30V max input voltage, 500mV dropout at 50mA, ±1% output accuracy, thermal shutdown, and enable control-designed for USB-powered instrumentation and portable battery-operated systems.

For engineers reviewing the AP7383-44W5-7 datasheet, AP7383-44W5-7 pinout, AP7383-44W5-7 application, or AP7383-44W5-7 equivalent, key selection criteria include dropout performance under 150mA load, EN logic compatibility (2.0V high / 0.4V low), thermal resistance (193°C/W), ultra-low quiescent current (1.8–3.0µA), and SOT25 footprint compatibility with PCB thermal copper planning.

Technical Context

The AP7383-44W5-7 integrates an error amplifier, precision voltage reference, resistor network for fixed 4.4V output, current-limit circuit (150mA typical), and active-enable logic with 1µA EN pin current. Its architecture supports stable regulation across -40°C to +125°C junction temperature with ±100ppm/°C output voltage drift.

It operates with ceramic capacitors as low as 1µF on both input and output, achieves 0.05%/V line regulation and 0.5% load regulation, and enters thermal shutdown at +160°C with +20°C hysteresis-enabling robust operation in space-constrained, thermally demanding portable designs.

Key Specifications

Pinout & Package

SOT25 (W5) package: 5-pin surface-mount, 2.8mm × 2.9mm footprint, exposed pad not electrically connected, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output ULDO regulator applications.

Compared with MCP1703T-4402E/MB and TPS7A2044PDBVR, the AP7383-44W5-7 uniquely balances ultra-low IQ (1.8µA), integrated EN (active-high), and SOT25 footprint-making it optimal for battery-sensitive, space-constrained designs requiring precise 4.4V regulation without external enable inversion or excessive thermal overhead.

Availability

AP7383-44W5-7 is available at Aetrix Electronics and suitable for portable medical sensors, USB-powered test equipment, and industrial data loggers requiring stable component supply with guaranteed long-term sourcing.

Supply support for AP7383-44W5-7 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs, with design centers across Asia, Europe, and the US, serving industrial, computing, consumer, and communications markets.

The AP7383 series belongs to Diodes' precision linear regulator product line, engineered specifically for ultra-low-power, wide-input-voltage applications in battery-powered and USB-connected portable electronics where size, efficiency, and accuracy are critical.

FAQ

What is the minimum input voltage required for regulation at 4.4V output?

The AP7383-44W5-7 requires VIN ≥ VOUT + VDROP. At 50mA load, dropout is 500mV, so minimum VIN is 4.9V. At 150mA, dropout rises to 1050mV, requiring VIN ≥ 5.45V. The recommended operating range starts at 3.5V, but regulation only begins once VIN exceeds VOUT plus actual dropout under load.

Can the NC pin be left floating on the SOT25 (W5) package?

No-the NC pin (Pin 5) is internally unconnected but must be tied to GND on the PCB. This maximizes copper area for thermal dissipation, reducing junction temperature by up to 15°C under full load, and improves mechanical reliability during reflow soldering per Diodes' layout recommendations.

Does the AP7383-44W5-7 support ceramic output capacitors smaller than 1µF?

No-Diodes specifies a minimum 1µF ceramic capacitor on VOUT for stability across all operating conditions. Using smaller values risks oscillation or poor transient response, as confirmed by phase margin testing in the datasheet's performance curves and application circuit diagrams.

How does thermal shutdown behave during continuous overload?

When junction temperature reaches +160°C, the AP7383-44W5-7 disables output and enters thermal shutdown. It remains off until temperature drops by ≥20°C (hysteresis), then automatically resumes regulation. This cycle prevents permanent damage but causes intermittent output-designers must ensure heatsinking or derating avoids repeated cycling in sustained overload scenarios.