Diodes Incorporated ZX5T949GTA

Overview

ZX5T949GTA from Diodes Incorporated is a 30V PNP low-saturation transistor in SOT223 package, rated for −5.5A continuous collector current and −20A peak pulse current, with V_CE(sat) as low as −30mV at I_C = −0.5A/I_B = −20mA. It delivers exceptional gain linearity down to −10mA and is AEC-Q101 qualified for automotive-grade reliability in high-current switching roles.

For engineers reviewing the ZX5T949GTA datasheet, ZX5T949GTA pinout, ZX5T949GTA application, or ZX5T949GTA equivalent, this device is selected for high-efficiency DC-DC converters, MOSFET gate drivers, and charging circuits where low V_CE(sat), robust thermal performance (R_θJA = 42°C/W), and stable h_FE across temperature are critical design requirements.

Technical Context

This PNP bipolar junction transistor operates with a minimum BV_CEO of −30V and supports emitter-base voltage up to −7V. Its gain (h_FE) ranges from 100–225 at I_C = −10mA/V_CE = −1V, and maintains usable current gain (≥10) even at I_C = −20A, enabling reliable saturation in high-pulse-power switching.

Thermal design is supported by R_θJL = 8.84°C/W (junction-to-lead) and linear derating of 24mW/°C above +25°C on a 52mm × 52mm 2oz copper PCB. ESD robustness includes 4kV HBM and 400V MM ratings per JEDEC JESD22-A114/A115.

Key Specifications

Pinout & Package

Package: SOT223 - Surface-mount plastic package with exposed collector tab for enhanced thermal conduction and mechanical anchoring. Molded "Green" compound meets UL 94V-0 flammability rating and J-STD-020 Level 1 moisture sensitivity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-current switching applications.

Compared with ZX5T949GTA, ZXTP2012ZTA trades voltage margin and efficiency for lower cost in 12V systems, while MJD44H11T4G offers higher breakdown but sacrifices automotive qualification and thermal density-making ZX5T949GTA optimal for AEC-Q101-compliant, high-efficiency 24V power switching.

Availability

ZX5T949GTA is available at Aetrix Electronics and suitable for automotive DC-DC converters, MOSFET gate drivers, and battery charging circuits requiring stable component supply, long-term lifecycle support, and AEC-Q101 compliance.

Supply support for ZX5T949GTA 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 consumer markets.

ZX5T949GTA belongs to Diodes' AEC-Q101-qualified PNP transistor family, engineered specifically for high-current, low-loss switching in automotive power conversion and control systems.

FAQ

What is the maximum continuous collector current for ZX5T949GTA?

The ZX5T949GTA is rated for −5.5A continuous collector current at T_A = +25°C with proper PCB thermal management (52mm × 52mm 2oz copper). Derating begins at 24mW/°C above +25°C, allowing ~2.2A at +100°C ambient under the same layout conditions.

Is ZX5T949GTA pin-compatible with other SOT223 PNP transistors?

No universal pin compatibility exists across SOT223 PNP transistors. ZX5T949GTA uses E-B-C-tab pinout (Emitter=Pin1, Base=Pin2, Collector=Pin3+Tab). Always verify pin assignment using the official Diodes AP02002 package drawing-not assumed from generic SOT223 footprints.

Does ZX5T949GTA require a base resistor in switching applications?

Yes. To ensure saturation and avoid thermal runaway, a base resistor must limit I_B to achieve I_C/I_B ≤ 20–50 depending on operating current. For −5.5A I_C, I_B = −500mA is specified; with V_BE(sat) ≈ −1.08V, a 2.2Ω resistor is typical when driven from −3.3V logic.

Can ZX5T949GTA be used in linear regulator applications?

It is not recommended. While it can operate in active region, its gain variation (h_FE drops from 225 at −10mA to 10 at −20A) and thermal resistance make closed-loop stability and thermal management difficult. Designed explicitly for switching, not linear regulation.