Diodes Incorporated ZXTP05120HFFTA

Overview

ZXTP05120HFF from Diodes Incorporated is a 120V PNP medium-power Darlington transistor in SOT23F package, delivering -1A continuous collector current, V_CE(SAT) < -1.1V @ -1A, h_FE ≥ 3,000 @ -1A, and 1.5W power dissipation - engineered for high-gain, low-saturation switching in gate driver and relay control circuits.

For engineers reviewing the ZXTP05120HFF datasheet, ZXTP05120HFF pinout, ZXTP05120HFF application, or ZXTP05120HFF equivalent, key selection criteria include verified BV_CEO = -120V, thermal resistance R_θJA = 60°C/W (on 50mm × 50mm 2oz Cu), ESD HBM = 2,000V, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Darlington pair integrates a high-voltage PNP input transistor with a high-gain output stage to achieve ultra-low saturation voltage and stable current gain up to -6A. Its complementary NPN counterpart is ZXTN04120HFF, enabling matched push-pull designs.

The device operates across -55°C to +150°C, supports pulsed I_C up to -4A, and features a thermally optimized SOT23F package with exposed collector pad and 43.8°C/W junction-to-lead thermal resistance - critical for compact motor and siren drivers requiring high power density.

Key Specifications

Pinout & Package

SOT23F is a surface-mount, low-profile variant of SOT23 with an exposed collector pad for enhanced thermal performance. It maintains pin compatibility with standard SOT23 footprints while offering improved power dissipation and reduced height.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP Darlington transistor applications.

Compared with ZXTP05120HFF, ZXTP07120HFF offers higher current headroom at identical footprint and voltage rating, while ZXTN04120HFF provides matched gain and saturation behavior in complementary NPN configuration - both require revalidation of base drive network and thermal layout.

Availability

ZXTP05120HFF is available at Aetrix Electronics and suitable for boost converters, gate drivers, and relay control systems requiring stable component supply, AEC-Q101 compliance, and high-reliability discrete switching performance.

Supply support for ZXTP05120HFF 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-performance, high-reliability components for automotive, industrial, and consumer markets.

The ZXTP series targets medium-power bipolar switching applications where high gain, low saturation voltage, and automotive qualification are essential - particularly in power management and electromechanical interface circuits.

FAQ

What is the maximum safe operating temperature for ZXTP05120HFF?

The device is rated for junction temperatures from -55°C to +150°C. With R_θJA = 60°C/W on 50mm × 50mm 2oz Cu, it sustains 1.5W dissipation up to +85°C ambient. Beyond that, power must be linearly derated at 12mW/°C to maintain T_J ≤ 150°C.

Can ZXTP05120HFF replace a standard PNP transistor like BC807 in existing designs?

No - its Darlington architecture delivers much higher h_FE and lower V_CE(SAT), but also requires ~2× higher V_BE(SAT) (~-1.5V vs. ~-0.7V). Base resistor values must be recalculated, and layout must accommodate the exposed collector pad for thermal performance.

Is ZXTP05120HFF suitable for driving inductive loads without external protection?

It withstands -120V V_CEO, which covers typical relay and lamp flyback voltages in 24V systems. However, for high-energy inductors (e.g., >100mH solenoids), a parallel flyback diode is still recommended to prevent voltage overshoot exceeding BV_CEO during rapid turn-off.

Does the SOT23F package require special PCB layout considerations?

Yes - the exposed collector pad must be connected to a minimum 15mm × 15mm 1oz copper area for basic operation, but optimal thermal performance (1.5W) demands 50mm × 50mm 2oz Cu. Creepage and clearance distances must exceed 1.5mm for 120V applications per IPC-2221 guidelines.