Diodes Incorporated ZXTR2008Z-13

Overview

ZXTR2008Z-13 from Diodes Incorporated is a monolithic high-voltage linear regulator transistor integrating an emitter-follower transistor, 8.2V Zener reference, and 150kΩ current-limiting resistor in a single SOT89 package. It delivers a regulated 8.2V ±10% output at 15mA across 12–100V input, with 42mA continuous output capability at VIN = 48V, and is used for startup bias supply in DC-DC converters.

For engineers reviewing the ZXTR2008Z-13 datasheet, ZXTR2008Z-13 pinout, ZXTR2008Z-13 application, or ZXTR2008Z-13 equivalent, key selection criteria include input voltage range (12–100V), output regulation tolerance (±10%), quiescent current (275–900 µA), thermal resistance (RθJA = 59 °C/W on 50mm × 50mm copper), and AEC-Q101 qualification for automotive reliability.

Technical Context

The ZXTR2008Z-13 implements a series linear regulator topology using an integrated emitter-follower stage, where the Zener diode sets the base voltage and the 150kΩ resistor establishes bias current. Regulation occurs only when VIN ≥ 12V; below that, VOUT follows VIN – 1.5V.

It operates as a self-contained, three-terminal active regulator - not a passive Zener shunt - with internal thermal protection enabled by its SOT89 exposed-VIN pad and junction-to-lead thermal resistance of 20 °C/W. Output stability requires ≥10µA load and recommended 10µF output capacitance.

Key Specifications

Pinout & Package

Package: SOT89 - surface-mount plastic package with exposed VIN pad for thermal conduction and mechanical anchoring; RoHS-compliant, halogen-free, 0.052g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL783CP and ZXTR2005Z-13, the ZXTR2008Z-13 uniquely combines fixed 8.2V output, integrated bias network, and SOT89 thermal performance - making it optimal for space-constrained, cost-sensitive PoE and telecom startup supplies where 8.2V is specified.

Availability

ZXTR2008Z-13 is available at Aetrix Electronics and suitable for Power over Ethernet (PoE), telecommunications line cards, and DC-DC converter startup circuits requiring stable component supply, AEC-Q101 reliability, and high-voltage linear regulation in compact SOT89 form factor.

Supply support for ZXTR2008Z-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, automotive, and communications markets.

The ZXTR2008Z-13 belongs to Diodes' high-voltage regulator transistor product line, engineered specifically to replace multi-component discrete bias networks in HV power systems - prioritizing integration, thermal efficiency, and qualification for harsh-environment applications.

FAQ

What is the minimum input voltage required for regulation?

The ZXTR2008Z-13 requires VIN ≥ 12V to maintain regulated 8.2V output. Below 12V, VOUT drops to VIN – 1.5V (e.g., 8.5V at VIN = 10V). This threshold is defined by internal Zener and transistor VBE characteristics and is confirmed in the Absolute Maximum Ratings table and Typical Application Circuit notes.

Can ZXTR2008Z-13 drive a 30mA load continuously?

Yes - at VIN = 48V and TA = +25°C, it supports 42mA continuous output current per the Electrical Characteristics table. At higher ambient temperatures or VIN, derating applies: e.g., at TA = 85°C and VIN = 48V, max continuous output drops to ~25mA based on the Derating Curve in the datasheet.

Is an output capacitor required, and what value is recommended?

Yes - a minimum 10µF ceramic or tantalum capacitor from VOUT to GND is required for stability and transient response, as stated in the "Typical Application Circuit" and "Pin Functions" sections. Lower values (e.g., 1µF) may cause oscillation or poor load-step recovery, especially under pulsed loads.

Does ZXTR2008Z-13 have built-in overtemperature protection?

No - the device lacks active thermal shutdown. Protection relies on safe operating area (SOA) limits and PCB thermal design. The datasheet specifies maximum junction temperature (TJ = +125°C) and derating curves; exceeding these risks permanent degradation. External thermal monitoring or current limiting is recommended for sustained high-power operation.