Diodes Incorporated AP7375Q-33Y-13

Overview

AP7375Q-33Y-13 from Diodes Incorporated is an AEC-Q100 qualified automotive-grade 3.3V fixed-output low-dropout linear regulator (LDO) with 45V max input voltage, 300mA output current capability, and ultra-low 2.1µA quiescent current. It features enable control up to 45V, integrated short-circuit and thermal shutdown protection, and ±2% output voltage accuracy - designed for power management in harsh automotive environments including body control modules and battery management systems.

For engineers reviewing the AP7375Q-33Y-13 datasheet, AP7375Q-33Y-13 pinout, AP7375Q-33Y-13 application, or AP7375Q-33Y-13 equivalent, this part supports stable 3.3V rail generation under wide-input (3–45V), high-transient, and low-power-consumption requirements typical of CAN/LIN transceivers and MCU subsystems in EV/HEV platforms.

Technical Context

The AP7375Q-33Y-13 implements a PMOS pass transistor architecture enabling low dropout (35mV @10mA, 350mV @100mA) and fast transient response without overshoot during startup or short-circuit recovery. Its EN pin accepts up to 45V logic-level input, eliminating external level-shifting circuitry in 12V/24V/48V automotive supply domains.

It delivers 85dB PSRR at 1kHz and maintains ±2% output accuracy across -40°C to +125°C ambient, with internal thermal shutdown triggered at +150°C junction temperature and +10°C hysteresis. The device operates with 1µF input and 10µF ceramic output capacitors, supporting X7R/X5R dielectrics for stability.

Key Specifications

Pinout & Package

SOT89-3 package (Package Code: Y) with exposed thermal pad not electrically connected; requires PCB copper area tied to GND for optimal thermal dissipation (θJA = 94.5°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73333PQDBVRQ1 and NCP114AMX33T2G, the AP7375Q-33Y-13 uniquely combines 45V input tolerance, 300mA output, 2.1µA IQ, and 45V-tolerant EN - making it the sole option for scalable 12V/24V/48V automotive LDO designs requiring full functional safety support and minimal external components.

Availability

AP7375Q-33Y-13 is available at Aetrix Electronics and suitable for automotive head units, body control modules, and EV battery management systems requiring stable component supply under AEC-Q100 compliance and IATF 16949 traceability.

Supply support for AP7375Q-33Y-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets, with ISO/TS 16949-certified production facilities.

The AP7375Q belongs to Diodes' automotive-qualified LDO family engineered specifically for wide-input, low-IQ, high-reliability power management in demanding vehicle subsystems - emphasizing robustness over cranking, load dump, and thermal stress.

FAQ

What is the minimum input voltage required for regulation at 3.3V output?

The AP7375Q-33Y-13 requires VIN ≥ 3.0V to operate, but stable regulation at full 300mA load demands VIN ≥ VOUT + VDROP(MAX). At 300mA, dropout reaches 1.4V (typ), so minimum functional VIN is 4.7V. For light loads (<10mA), regulation begins at VIN = 3.335V due to 35mV dropout.

Can the EN pin be left floating in the application?

No - the EN pin must be actively driven high (≥1V) to enable output or pulled low (≤0.4V) to disable. Leaving it floating risks undefined state due to internal leakage paths; Diodes recommends connecting EN to VIN via 100kΩ pull-up if always-on operation is intended.

Is the exposed pad on the SOT89 package electrically connected?

No - the exposed pad on the SOT89 package (Y code) is thermally conductive but electrically isolated. It must be soldered to a large GND-connected copper pour for thermal dissipation, but must not serve as the primary GND electrical connection; dedicated Pin 2 remains the signal ground path.

Does AP7375Q-33Y-13 require an external bypass capacitor on the EN pin?

No external capacitor is required on EN. The EN pin has internal hysteresis and filtering; however, for noisy environments, a 10nF ceramic capacitor from EN to GND may improve noise immunity without affecting enable timing - verified in Diodes' application note AN-44818-Rev7.