Diodes Incorporated ZXTR2112F-7

Overview

ZXTR2112F-7 from Diodes Incorporated is a monolithic 12V ±10% linear regulator transistor in SOT23 package, integrating an emitter-follower transistor, zener reference, and bias resistor. It delivers regulated 12V output at up to 15mA continuous load with input voltage range 15–60V, designed for high-voltage industrial and automotive supply rails such as 24V-to-12V conversion.

For engineers reviewing the ZXTR2112F-7 datasheet, ZXTR2112F-7 pinout, ZXTR2112F-7 application, or ZXTR2112F-7 equivalent, key selection criteria include input voltage headroom (≥15V min), thermal derating on 15mm×15mm copper, quiescent current (≤3.5mA at 60V), and AEC-Q101 qualification for automotive under-hood use.

Technical Context

The ZXTR2112F-7 implements a series linear regulator using an emitter-follower topology with internal zener-based reference and fixed bias network. Regulation is achieved without external feedback components, relying on integrated device matching for stable 12V output across temperature and line variations.

It operates within a junction temperature range of –65°C to +150°C and exhibits 10.4 mV/°C output voltage temperature coefficient. Safe operating area is defined by thermal resistance R_ΘJA = 250°C/W on 15mm×15mm 1oz Cu PCB, limiting continuous power dissipation to 500 mW at 25°C ambient.

Key Specifications

Pinout & Package

Package: SOT23 (2T3 marking), molded green plastic, matte tin-plated leads, moisture sensitivity level 1, weight ≈ 0.008g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXTR2105F-7, the ZXTR2112F-7 provides higher output voltage for 12V system rails but shares identical thermal and qualification profiles; versus TL783CP, it trades adjustability and current for automotive compliance and compact SOT23 integration.

Availability

ZXTR2112F-7 is available at Aetrix Electronics and suitable for industrial sensor power supplies, automotive body control modules, and legacy equipment voltage translation requiring stable component supply, AEC-Q101 qualification, and SOT23 footprint compatibility.

Supply support for ZXTR2112F-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection devices for industrial, automotive, and consumer markets.

The ZXTR series targets high-input-voltage linear regulation needs where space-constrained, thermally efficient, and qualification-ready solutions replace discrete zener-transistor circuits in automotive and industrial power rails.

FAQ

What is the minimum input voltage required for regulation?

The ZXTR2112F-7 requires a minimum input voltage of 15V to maintain regulated 12V output. Below 15V, the output follows VIN minus approximately 1V (e.g., at 12V input, VOUT ≈ 11V), and regulation is lost. This threshold is defined by the internal zener reference and emitter-base voltage drop.

Can ZXTR2112F-7 operate without an output load?

No - the device requires a minimum load current of 10µA on VOUT to maintain regulation. Without this load, output voltage may rise above 13.2V due to internal leakage paths. A 100kΩ pull-down resistor ensures compliance while adding negligible power loss.

How does thermal performance change on smaller PCB copper areas?

On a 15mm×15mm 1oz copper pad, R_ΘJA is 250°C/W, allowing 500mW dissipation at 25°C ambient. Reducing copper area increases thermal resistance - e.g., on 10mm×10mm, R_ΘJA exceeds 300°C/W, limiting safe continuous power to ~330mW before exceeding 150°C junction temperature.

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 stability and maintain regulation under load steps up to 15mA.