Diodes Incorporated AP7375Q-18SP-13

Overview

AP7375Q-18SP-13 from Diodes Incorporated is an AEC-Q100 qualified automotive-grade 1.8V fixed-output ultra-low-dropout linear regulator (LDO) with 45V max input voltage, 300mA output current capability, and 2.1µA quiescent current. It features enable control up to 45V, ±2% output accuracy, 85dB PSRR at 1kHz, and integrated short-circuit/thermal shutdown protection. Used in MCU power rails and CAN/LIN transceiver supplies in body control modules.

For engineers reviewing the AP7375Q-18SP-13 datasheet, AP7375Q-18SP-13 pinout, AP7375Q-18SP-13 application, or AP7375Q-18SP-13 equivalent, this page delivers verified technical context, SO-8EP package pin mapping, automotive thermal performance data, and validated alternatives for 1.8V LDO selection in harsh-environment embedded systems.

Technical Context

The AP7375Q-18SP-13 implements a PMOS pass transistor architecture enabling 35mV dropout at 10mA and 350mV at 100mA, supporting stable regulation across 3V–45V input range. Its EN pin accepts up to 45V logic-level signals, eliminating external level-shifting circuitry in high-side enable configurations.

It delivers fast transient response with no overshoot during startup or short-circuit recovery, enabled by internal compensation optimized for 1µF input and 10µF ceramic output capacitors. Thermal shutdown activates at +150°C with +10°C hysteresis, and current limiting clamps output at 500mA typical.

Key Specifications

Pinout & Package

AP7375Q-18SP-13 is packaged in SO-8EP (exposed pad), offering 47.7°C/W θJA and enhanced thermal dissipation versus SOT25 or SOT89. The exposed pad must be connected to PCB ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1.8V automotive LDO applications.

Compared with TLV73318PQDBVRQ1 and NCP163AMX180TBG, AP7375Q-18SP-13 uniquely combines 45V input/enable tolerance, AEC-Q100 Grade 1 qualification, and SO-8EP thermal performance - making it the only drop-in solution for direct-battery 1.8V LDO needs in engine bay or powertrain ECUs.

Availability

AP7375Q-18SP-13 is available at Aetrix Electronics and suitable for automotive body control modules, EV battery management systems, and transmission control units requiring stable component supply across extended temperature and long product lifecycles.

Supply support for AP7375Q-18SP-13 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 devices for automotive, industrial, and computing markets.

The AP7375Q series belongs to Diodes' automotive-qualified power management portfolio, designed specifically for robust, wide-input LDO operation in harsh-temperature vehicle subsystems where reliability and transient immunity are mandatory.

FAQ

What is the minimum input voltage required for AP7375Q-18SP-13 to regulate 1.8V output?

The device requires VIN ≥ (VOUT + VDROP(MAX)) = 1.8V + 1.4V = 3.2V at 300mA per datasheet Note 6. However, functional operation begins at VIN = 3.0V per Recommended Operating Conditions, with guaranteed regulation starting at VIN ≥ 3.2V under full load. Below 3.2V, output drops linearly with input.

Can AP7375Q-18SP-13 drive a 300mA load continuously at +125°C ambient?

Yes, when mounted on a 2oz copper PCB with ≥200mm² thermal pad connected to GND, its θJA = 47.7°C/W and TJ(max) = +150°C allow continuous 300mA operation at +125°C ambient. Power dissipation is (VIN – 1.8V) × 0.3A; at VIN = 13.5V, PD = 3.51W, resulting in ΔT = 167°C - thus minimum VIN must be reduced to ≤10.5V for safe operation at max ambient.

Is the EN pin actively pulled down internally when not driven?

No. The EN pin has no internal pull-down; it is a high-impedance CMOS input with VENL = 0.4V max. An external pull-down resistor (≤100kΩ) is required to ensure reliable disable state during power-up or MCU reset. Leaving EN floating risks undefined output behavior.

Does AP7375Q-18SP-13 require an external bypass capacitor on the EN pin?

No external capacitor is required on EN. The pin is DC-coupled and immune to transients up to 45V. However, if routing near noisy traces, a 100pF ceramic capacitor to GND may reduce susceptibility to fast EFT bursts - this is optional and not specified in the datasheet.