Diodes Incorporated AP7375Q-33WR-7

Overview

AP7375Q-33WR-7 from Diodes Incorporated is an AEC-Q100 qualified automotive-grade 3.3V 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, and integrated short-circuit/thermal shutdown protection. Designed for body control modules and EV battery management systems where wide VIN range and low IQ are critical.

For engineers reviewing the AP7375Q-33WR-7 datasheet, AP7375Q-33WR-7 pinout, AP7375Q-33WR-7 application, or AP7375Q-33WR-7 equivalent, this page delivers verified technical context, package-specific pin mapping, automotive thermal performance data, and real-world LDO selection criteria including dropout behavior at 100mA and PSRR at 1kHz.

Technical Context

The AP7375Q-33WR-7 implements a PMOS pass transistor architecture enabling 35mV dropout at 10mA and 350mV at 100mA, supporting stable regulation across 3V–45V input while maintaining 85dB PSRR at 1kHz. Its EN pin accepts up to 45V logic-level input, eliminating external level-shifting circuitry in high-side enable configurations.

Thermal protection triggers at +150°C junction temperature with +10°C hysteresis, and short-circuit current limit is internally set to ~500mA. The device achieves fast transient response with no overshoot during startup or short-circuit recovery, validated under 10–300mA load steps with 100µs rise/fall times.

Key Specifications

Pinout & Package

SOT25 (Package Code: WR) - 5-pin surface-mount package with exposed thermal pad (EP), optimized for space-constrained automotive PCBs. Requires large copper area connected to EP for thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73333PQDBVRQ1 and NCP163AMX330TBG, the AP7375Q-33WR-7 uniquely balances 45V direct-battery operation, 2.1µA IQ, and AEC-Q100 Grade 1 qualification-making it optimal for cost-sensitive, space-constrained BCM and BMS nodes where both cold-crank and load-dump immunity are mandatory.

Availability

AP7375Q-33WR-7 is available at Aetrix Electronics and suitable for automotive body control modules, EV battery management sensor nodes, and transmission control unit interface power requiring stable component supply across production lifecycles.

Supply support for AP7375Q-33WR-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets, with IATF 16949 certified manufacturing facilities.

The AP7375Q series belongs to Diodes' automotive-qualified power management portfolio, engineered specifically for robustness in harsh automotive environments-including load dump, cold crank, and extended temperature operation.

FAQ

What is the minimum input voltage required for regulation at 300mA output?

The AP7375Q-33WR-7 requires VIN ≥ VOUT + VDROP(MAX). At 300mA and +25°C, VDROP is 1400mV maximum per datasheet. Thus, minimum VIN = 3.3V + 1.4V = 4.7V. Below this, output voltage drops linearly with input; regulation is not maintained.

Can the EN pin be left floating in a production design?

No. The EN pin has no internal pull-up; it is internally pulled down. Leaving it floating risks unintended enable/disable states due to noise coupling. Diodes recommends connecting EN to GND via a 100kΩ resistor if permanently enabled, or driving it actively with a clean logic signal.

Is the U-DFN2020-6 (SWP) package thermally superior to SOT25 for this LDO?

Yes. The U-DFN2020-6 (SWP) package has θJA = 99.5°C/W versus 135.5°C/W for SOT25 (WR). With identical PCB layout (2oz copper, 100mm² EP thermal pad), U-DFN2020-6 sustains ~30% higher continuous current before thermal shutdown at +85°C ambient.

Does the ±2% output voltage tolerance include initial accuracy and temperature drift?

Yes. The ±2% specification covers total error over full operating conditions: −40°C to +125°C junction temperature, 3V–45V input, and 1mA–300mA load. It includes initial tolerance, line regulation (0.02%/V), load regulation (0.025%/mA), and thermal drift-all guaranteed in production test.