Diodes Incorporated AP7383-33WW-7

Overview

AP7383-33WW-7 from Diodes Incorporated is a fixed-output 3.3V ultra-low dropout (ULDO) linear regulator IC designed for space-constrained, battery-powered systems. It delivers up to 150mA output current with 500mV dropout at 50mA, ±1% output voltage accuracy over load/temperature, and only 1.8µA ground current at zero load - enabling multi-year operation in coin-cell or Li-ion portable applications.

For engineers reviewing the AP7383-33WW-7 datasheet, AP7383-33WW-7 pinout, AP7383-33WW-7 application, or AP7383-33WW-7 equivalent, key selection criteria include its 3.5–30V input range, thermal shutdown at +160°C, EN control capability in W5 variant (not present in WW), and compatibility with 1µF ceramic output capacitors without ESR requirements.

Technical Context

The AP7383-33WW-7 implements a bandgap-referenced error amplifier driving a PMOS pass transistor, enabling low dropout and high PSRR across frequency. Its internal current-limit circuit triggers at 150mA nominal, and thermal shutdown activates at +160°C with +20°C hysteresis to prevent latch-up during overload.

No enable function is integrated in the WW package variant - pins 4 and 5 are NC (not connected internally) and must be tied to GND for optimal thermal dissipation. The regulator operates stably with 1µF input and output ceramic capacitors, eliminating need for bulk electrolytics.

Key Specifications

Pinout & Package

SOT25-5 (WW package) - 5-pin surface-mount package with exposed pad for thermal enhancement; footprint compatible with JEDEC MO-203AA. Pin 1 = VIN, Pin 2 = GND, Pin 3 = VOUT, Pins 4 & 5 = NC (internally unconnected; recommended tied to GND for PCB copper area and thermal relief).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7383-33WW-7, AP7361-33W5-7 adds enable control but sacrifices 50mA output headroom and thermal shutdown margin, while MCP1703T-3302E/MB offers higher current but omits thermal protection and has higher dropout - making AP7383-33WW-7 optimal for thermally constrained, wide-input, low-IQ applications requiring robust fault coverage.

Availability

AP7383-33WW-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and USB-C powered peripherals requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AP7383-33WW-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 U.S., and manufacturing in certified facilities compliant with IATF 16949 and ISO 9001.

The AP7383 series belongs to Diodes' high-reliability ULDO regulator product line, engineered specifically for battery-powered, wide-input, and thermally demanding applications where precision, low IQ, and fault resilience are critical.

FAQ

What is the maximum allowable input voltage for AP7383-33WW-7?

The absolute maximum input voltage is 33V, but the recommended operating range is 3.5V to 30V per the datasheet. Operation above 30V risks exceeding safe power dissipation limits, especially at high ambient temperatures or high output currents. Thermal derating must be applied above 25°C ambient using the specified θJA of 193°C/W for the SOT25-5 (WW) package.

Does AP7383-33WW-7 have an enable (EN) pin?

No - the WW package variant has pins 4 and 5 designated as NC (not connected internally). Unlike the W5 package, it lacks enable functionality. For designs requiring controlled startup or standby mode, the AP7383-33W5-7 (SOT25-5 with EN) or AP7383-33FDC-7 (U-DFN2020-6 with EN) should be selected instead.

Can AP7383-33WW-7 operate with a 1µF ceramic output capacitor?

Yes - the AP7383-33WW-7 is explicitly characterized and guaranteed stable with a 1µF X5R or X7R ceramic capacitor on the output, with no minimum ESR requirement. This eliminates need for larger, less reliable tantalum or aluminum electrolytic capacitors and simplifies layout in space-constrained designs.

What is the thermal shutdown behavior of AP7383-33WW-7?

Thermal shutdown activates at +160°C junction temperature and includes +20°C hysteresis, meaning the device resumes regulation only after junction temperature falls below +140°C. This prevents oscillatory shutdown/restart during sustained overload and provides robust protection in sealed enclosures or high-ambient environments.