Diodes Incorporated ZX5T1951GTA

Overview

ZX5T1951GTA from Diodes Incorporated is a 60V PNP medium-power transistor in SOT223 package, rated for -6A continuous collector current, with V_CE(sat) < -95mV at -1A and R_CE(sat) = 40mΩ. It delivers high DC current gain (h_FE = 100–240 at -10mA, down to 5–14 at -10A) and is AEC-Q101 qualified for automotive-grade reliability in motor drive and solenoid control circuits.

For engineers reviewing the ZX5T1951GTA datasheet, ZX5T1951GTA pinout, ZX5T1951GTA application, or ZX5T1951GTA equivalent, key selection criteria include its -60V V_CEO, low saturation voltage under high-current switching, thermal resistance of 42°C/W (on 52mm × 52mm 2oz copper), and SOT223 lead-frame thermal performance validated per J-STD-020 Level 1 moisture sensitivity.

Technical Context

This PNP bipolar junction transistor operates in linear and saturated switching modes, with specified h_FE across four current ranges (-10mA to -10A) and V_CE(sat) tested under pulsed conditions (≤300µs, ≤2% duty cycle). Its safe operating area (SOA) is defined up to -6A DC and -60V, with transient thermal impedance curves supporting pulse-width-based power derating.

The device uses a planar epitaxial die structure with matte tin-plated leads solderable per MIL-STD-202 Method 208. Thermal resistance from junction to lead (R_θJL) is 12.3°C/W, enabling direct heat conduction through the collector tab to PCB copper, critical for DC-DC module and backlight inverter thermal management.

Key Specifications

Pinout & Package

Package: SOT223 - Surface-mount plastic package with exposed collector tab for thermal conduction; 0.112g weight; UL 94V-0 flammability rating; RoHS-compliant, halogen- and antimony-free "Green" compound.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP medium-power transistor applications.

Compared with ZXTN25050DFH and MJD44H11T4, ZX5T1951GTA uniquely balances AEC-Q101 compliance, SOT223 thermal efficiency, and -6A/-60V operation-making it optimal for space-limited automotive actuators where reliability and thermal density are jointly critical.

Availability

ZX5T1951GTA is available at Aetrix Electronics and suitable for motor driving, DC-DC modules, and actuator, relay, and solenoid drivers requiring stable component supply and automotive-grade qualification.

Supply support for ZX5T1951GTA 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 components for automotive, industrial, and consumer markets.

The ZX5T series targets medium-power bipolar switching applications demanding AEC-Q101 qualification, low saturation voltage, and SOT223 thermal performance-designed specifically for automotive body electronics and industrial motion control.

FAQ

What is the maximum continuous collector current for ZX5T1951GTA, and under what conditions is it specified?

The ZX5T1951GTA is rated for -6A continuous collector current when mounted on a 52mm × 52mm 2oz copper area on a 1.6mm FR4 PCB under still-air conditions. This rating assumes steady-state thermal equilibrium and excludes transient pulses. Derating to 1.6W is required above +25°C ambient per the 24mW/°C linear derating factor.

Does ZX5T1951GTA support linear-mode operation, and what parameters validate that capability?

Yes, ZX5T1951GTA supports linear-mode operation, evidenced by its specified V_CE(sat) across multiple current levels, SOA curve covering DC and pulse conditions, and h_FE characterization from -10mA to -10A. The device's f_T = 120MHz and low C_obo = 33pF enable stable biasing in analog current-source configurations such as backlight regulation.

How does the SOT223 package of ZX5T1951GTA improve thermal performance compared to smaller packages like SOT-23?

The SOT223 package features an exposed collector tab directly bonded to the die, achieving R_θJL = 12.3°C/W-over 3× better than typical SOT-23 devices. Its larger pad layout (6.5mm × 3.5mm) and 0.95mm lead length allow efficient heat transfer into PCB copper, enabling >2W dissipation on modest copper areas without external heatsinks.

Is ZX5T1951GTA suitable for automotive applications, and which specific AEC-Q101 stress tests does it pass?

Yes, ZX5T1951GTA is AEC-Q101 qualified, having passed temperature cycling (-55°C to +150°C), high-temperature operating life (1000 hours at +150°C), ESD (HBM 4kV, MM 400V), and mechanical shock/vibration tests per the AEC-Q101 standard. Its construction-including halogen-free molding compound and matte tin plating-meets automotive material compliance requirements.