Diodes Incorporated ZX5T955GTA

Overview

ZX5T955GTA from Diodes Incorporated is a PNP medium-power low-saturation transistor in SOT223 package, rated for -140V V_CEO, -4A continuous collector current, and -120mV V_CE(sat) at -1A. It delivers 92mΩ equivalent on-resistance and maintains h_FE ≥45 up to -10A, supporting high-side switching in telecom SLIC circuits and industrial motor drivers.

For engineers reviewing the ZX5T955GTA datasheet, ZX5T955GTA pinout, ZX5T955GTA application, or ZX5T955GTA equivalent, key selection criteria include verified -140V breakdown rating, thermal resistance of 41.7°C/W (52mm×52mm 2oz Cu), AEC-Q101 qualification, and SOT223 lead-frame layout compatibility with high-voltage creepage requirements.

Technical Context

This PNP bipolar junction transistor operates as a high-voltage, medium-current switch with specified gain hold-up across -10A, enabling stable conduction under pulsed load conditions. Its low V_CE(sat) and 92mΩ R_SAT reduce power loss in linear and saturated-mode applications such as line interface and motor control.

The device features robust thermal performance: 3.0W power dissipation on 52mm×52mm 2oz copper, 10.5°C/W junction-to-lead resistance, and ESD ratings of 8kV HBM and 400V MM. It is qualified to AEC-Q101 and manufactured with halogen/antimony-free "Green" molding compound.

Key Specifications

Pinout & Package

Package: SOT223 - Surface-mount plastic case with exposed collector tab for thermal enhancement; 0.112g weight; UL 94V-0 flammability rating; moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZX5T955GTA, ZX5T953GTA trades 40V breakdown and 1A current headroom for lower unit cost, while MJD127-TP lacks automotive qualification and exhibits wider h_FE variation-making ZX5T955GTA preferable for safety-critical or high-reliability 100–140V switching.

Availability

ZX5T955GTA is available at Aetrix Electronics and suitable for subscriber line interface cards, industrial motor drivers, and automotive body control modules requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant discrete transistors.

Supply support for ZX5T955GTA 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The ZX5T955G series belongs to Diodes' high-voltage PNP transistor product line, engineered specifically for telecom infrastructure, industrial automation, and automotive body electronics demanding robust saturation performance and extended temperature reliability.

FAQ

What is the maximum safe operating voltage for ZX5T955GTA in continuous DC applications?

The absolute maximum collector-emitter voltage (V_CEO) is -140V at T_A = +25°C. For continuous DC operation, design margins require limiting steady-state V_CE to ≤-112V (80% of rating) to ensure long-term reliability under thermal stress and voltage transients per JEDEC JESD78 guidelines.

Does ZX5T955GTA require a heatsink in typical 4A switching applications?

Yes-when operating at -4A continuous current, the device dissipates up to 0.48W (based on -120mV V_CE(sat)). With R_θJA = 41.7°C/W on 52mm×52mm 2oz Cu, junction temperature rise exceeds 100°C above ambient. A minimal copper pour or clip-on heatsink is recommended to maintain T_J < +125°C.

Can ZX5T955GTA replace an N-channel MOSFET in high-side configurations?

No-it functions as a PNP BJT, not a MOSFET. While both can serve as high-side switches, ZX5T955GTA requires continuous base current (e.g., -100mA for -1A I_C), whereas MOSFETs are voltage-driven. Its 92mΩ R_SAT approximates on-resistance but does not eliminate gate-drive complexity or offer the same switching speed.

Is the SOT223 package lead finish compatible with lead-free reflow profiles?

Yes-the terminals feature matte tin plating and are rated for lead-free reflow per IPC/JEDEC J-STD-020. Peak temperature tolerance is 260°C for 30 seconds, matching standard Pb-free SAC305 solder profiles. The "Green" compound also complies with RoHS 2 (2011/65/EU) and halogen-free specifications.