Diodes Incorporated ZXTR2012P5-13

Overview

ZXTR2012P5-13 from Diodes Incorporated is a monolithic high-voltage linear regulator transistor integrating an NPN emitter-follower, 12V zener reference, and 150kΩ current-limiting resistor in a single PowerDI5 package. It delivers a regulated 12V ±10% output at 15mA over 15–100V input, with 45dB PSRR and 8mV/°C temperature coefficient - deployed in PoE auxiliary supplies and DC-DC startup circuits.

For engineers reviewing the ZXTR2012P5-13 datasheet, ZXTR2012P5-13 pinout, ZXTR2012P5-13 application, or ZXTR2012P5-13 equivalent, key selection criteria include input voltage range (15–100V), output regulation tolerance (±10%), thermal resistance (R_θJA = 55°C/W on 50mm×50mm copper), quiescent current (240–900µA), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

The ZXTR2012P5-13 implements a series linear regulator using an internal NPN emitter-follower stage with integrated zener biasing and fixed 150kΩ base resistor. Regulation occurs only when input voltage is ≥15V; below that, V_OUT tracks V_IN – 1.5V. Output is internally clamped to max(V_IN+12V, 18V).

It operates across –40°C to +125°C junction temperature, supports continuous output current up to 50mA at V_IN = 48V, and sustains 880mA pulsed current (100µs). Thermal design requires attention to exposed VIN pad soldering - R_θJL = 20°C/W and R_θJC = 17.8°C/W confirm lead-to-case conduction dominates heat removal.

Key Specifications

Pinout & Package

Package: PowerDI5 - surface-mount, thermally enhanced plastic package with exposed VIN pad for PCB heat sinking. Dimensions: 3.966mm × 6.504mm × 1.10mm (L×W×A), 0.85mm lead length, matte tin-plated leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL783CP and LT3080IMSE#PBF, the ZXTR2012P5-13 uniquely combines fixed 12V regulation, 100V input capability, monolithic integration, and AEC-Q101 qualification - making it optimal for space-limited, high-reliability HV bias generation where external components must be minimized.

Availability

ZXTR2012P5-13 is available at Aetrix Electronics and suitable for Power-over-Ethernet auxiliary supplies, DC-DC converter startup circuits, and telecom line card biasing requiring stable component supply, long lifecycle support, and automotive-grade reliability.

Supply support for ZXTR2012P5-13 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 automotive, industrial, and communications markets.

The ZXTR2012P5-13 belongs to Diodes' high-voltage regulator transistor family, designed specifically to replace multi-component discrete HV bias networks in space-constrained, thermally demanding applications such as PoE, telecom, and automotive subsystems.

FAQ

What is the minimum load required for stable regulation?

The ZXTR2012P5-13 requires a minimum load of 10µA on VOUT to maintain regulation. This is specified in the datasheet's "Typical Application Circuit" section and confirmed in the Pin Functions table. Without this load, output voltage may rise above 12V due to internal zener biasing characteristics. A 10µF ceramic capacitor to GND is also mandatory for transient stability.

Can ZXTR2012P5-13 regulate when input voltage is below 15V?

No - regulation is only guaranteed for VIN ≥15V. Below 15V, the device operates in pass-through mode: VOUT ≈ VIN – 1.5V (emitter-follower V_BE drop). This behavior is explicitly defined in the "Pin Functions" table and Absolute Maximum Ratings section. For sub-15V operation, an alternative regulator must be selected.

How is thermal performance affected by PCB copper area?

R_θJA degrades from 55°C/W (50mm×50mm 1oz Cu) to 107°C/W (15mm×15mm 1oz Cu). The exposed VIN pad is the primary thermal path; insufficient copper reduces safe continuous output current - e.g., at 48V input, max I_OUT drops from 50mA to ~25mA when using minimal copper. Layout guidelines are provided in the "Thermal Characteristics" section of DS36766.

Is ZXTR2012P5-13 compatible with lead-free reflow profiles?

Yes - it is fully RoHS-compliant and qualified for lead-free reflow per JEDEC J-STD-020. The device has Moisture Sensitivity Level 1, meaning it can be stored indefinitely at ≤30°C/60% RH without baking. Matte tin-plated leads meet MIL-STD-202 Method 208 for solderability, supporting standard SAC305 peak temperatures up to 260°C.