Diodes Incorporated ZXTR2112FQ-7

Overview

ZXTR2112FQ from Diodes Incorporated is a monolithic 12V ±10% linear regulator transistor in SOT23, integrating an emitter-follower transistor, zener reference, and bias resistor. It delivers 15mA regulated output from 15–60V input, features AEC-Q101 qualification, and is used for 24V-to-12V rail regulation in automotive control modules.

For engineers reviewing the ZXTR2112FQ datasheet, ZXTR2112FQ pinout, ZXTR2112FQ application, or ZXTR2112FQ equivalent, key selection criteria include input voltage range (15–60V), output tolerance (±10%), quiescent current (≤3.5mA at 60V), thermal resistance (250°C/W on 15mm×15mm PCB), and automotive qualification status.

Technical Context

The ZXTR2112FQ implements a series linear regulator using an emitter-follower topology with internal zener-based voltage reference and fixed bias network. Regulation is achieved without external feedback components, relying on monolithic matching of integrated elements.

It operates across -40°C to +125°C junction temperature, supports 50mA continuous output at VIN=24V, and maintains line regulation within 150mV over 15–60V input while exhibiting 10.4mV/°C temperature coefficient and 50dB PSRR at 100Hz.

Key Specifications

Pinout & Package

Package: SOT23 (2T3 marking), surface-mount plastic case with matte tin-plated leads, UL 94V-0 rated, 0.008g weight.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear regulator applications.

Compared with TL783CP and LM2931AZ-12, the ZXTR2112FQ uniquely combines SOT23 size, AEC-Q101 qualification, and 15–60V input range in a fixed 12V solution-making it optimal for compact, high-reliability automotive 12V point-of-load regulation where external components and board area must be minimized.

Availability

ZXTR2112FQ is available at Aetrix Electronics and suitable for automotive body control modules, instrument clusters, telematics units, and ADAS camera systems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for ZXTR2112FQ 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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The ZXTR series targets high-voltage linear regulation in automotive and industrial environments, emphasizing monolithic integration, AEC-Q101 compliance, and minimal external component count for robust, space-efficient power management.

FAQ

What is the minimum input voltage required for regulation?

The ZXTR2112FQ requires a minimum input voltage of 15V to maintain regulated 12V output. Below 15V, VOUT follows VIN minus ~1V (e.g., at 12V input, output is ~11V). This threshold is defined by the internal zener reference and emitter-base drop of the integrated transistor.

Can ZXTR2112FQ operate with no load?

No. The device requires a minimum load current of 10µA on VOUT to maintain regulation and stability. Without this load, output voltage may rise above 12V due to internal leakage paths; a 100kΩ pull-down resistor satisfies this requirement.

Is external capacitance mandatory on VIN and VOUT?

Yes. A 1µF ceramic capacitor is required between VIN and GND to suppress high-frequency noise and prevent oscillation. A 10µF tantalum or aluminum electrolytic capacitor is required between VOUT and GND to ensure transient response and loop stability under load steps.

How does thermal performance change with PCB copper area?

Thermal resistance θJA improves from 250°C/W (15mm×15mm 1oz Cu) to 200°C/W (25mm×25mm 1oz Cu). Derating curves show usable power drops from 500mW to 400mW as ambient temperature rises from 25°C to 85°C on the smaller pad layout.