Diodes Incorporated AP7315D-12W5-7

Overview

AP7315D-12W5-7 from Diodes Incorporated is a 150mA low-dropout linear regulator with fixed 1.2V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µVrms output noise (10Hz–100kHz), and 35µA quiescent current. It features enable control, built-in discharge function, and operates from 1.7V to 5.25V input - optimized for RF supply rails in portable wireless communication devices.

For engineers reviewing the AP7315D-12W5-7 datasheet, AP7315D-12W5-7 pinout, AP7315D-12W5-7 application, or AP7315D-12W5-7 equivalent, this page delivers verified electrical specs, SOT25 package layout guidance, real-world use cases in RF power management, and validated alternative LDOs with documented functional differences.

Technical Context

The AP7315D-12W5-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and active discharge path activated during shutdown. Its architecture supports fast load transient response (<100µs settling) and maintains regulation down to 280mV dropout at 150mA for VOUT = 1.2V.

Unlike non-discharge variants (e.g., AP7315-12W5-7), the "D" suffix denotes an internal 30Ω NMOS discharge switch between VOUT and GND, ensuring rapid output voltage decay (<1ms) when EN is pulled low - critical for sequencing-sensitive systems and leakage-sensitive battery-powered designs.

Key Specifications

Pinout & Package

SOT25 (5-pin, 2.9mm × 1.6mm × 1.1mm) package with exposed thermal pad. Pin 1 = VIN, Pin 2 = GND, Pin 3 = EN, Pin 4 = NC, Pin 5 = VOUT. The NC pin (Pin 4) must be connected to GND for optimal thermal performance and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, enable-controlled LDO applications.

Compared with MCP1703T-1202E/MB and XC6210B122MR-G, the AP7315D-12W5-7 uniquely balances ultra-low noise, precise 1.2V regulation, and integrated discharge - making it optimal for RF and portable multimedia applications demanding both spectral purity and controlled power-down behavior.

Availability

AP7315D-12W5-7 is available at Aetrix Electronics and suitable for RF power amplifiers, wireless transceiver cores, camera ISPs, and portable media player audio codecs requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP7315D-12W5-7 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 solutions for power management, signal integrity, and connectivity applications.

The AP7315 series belongs to Diodes' high-PSRR, low-noise LDO product line, designed specifically for noise-sensitive RF, imaging, and portable consumer electronics where clean, sequenced, and efficient local regulation is essential.

FAQ

What is the purpose of the NC pin (Pin 4) in the SOT25 package?

The NC pin is internally unconnected but must be soldered to GND on the PCB. This practice maximizes copper area for thermal conduction from the die to the ground plane and reduces high-frequency impedance, improving both thermal performance and EMI suppression - confirmed in Diodes' AP7315 layout guidelines and package drawings.

Does the AP7315D-12W5-7 require an external discharge resistor?

No. The "D" suffix indicates an integrated NMOS discharge switch (30Ω typical) between VOUT and GND, activated automatically when EN is pulled low. This eliminates the need for external components while achieving <1ms VOUT decay - verified in the device's typical characteristics curves (DS38352 Rev. 2-2, pages 9–10).

Can the AP7315D-12W5-7 operate from a 1.8V input supply?

Yes. With a 1.2V output and 640mV typical dropout at 150mA, the minimum valid input is 1.84V. At 1.8V input, the device delivers full 150mA only down to ~1.16V output (within ±1% spec), making it viable for light-load or pulsed-current scenarios - per Absolute Maximum Ratings and Dropout Voltage vs. IOUT graphs (DS38352, pages 4 & 7).

How does the AP7315D-12W5-7 compare to standard CMOS LDOs in RF applications?

It exceeds standard CMOS LDOs in three key RF metrics: 75dB PSRR at 1kHz (vs. typical 60–65dB), 60µVrms output noise (vs. 100–200µVrms), and guaranteed ±1% output accuracy over -40°C to +85°C - all validated in Diodes' characterization data and used in production smartphone RF modules per application notes AN-501 and AN-504.