Diodes Incorporated FZT493TA

Overview

FZT493TA from Diodes Incorporated is a 100V NPN medium-power transistor in SOT223 package, rated for 1A continuous collector current and 2A peak pulse current, with V_CE(sat) ≤ 0.6V at I_C = 1A/I_B = 100mA, and qualified to AEC-Q101 for automotive reliability. It serves as a high-voltage switching element in DC-DC converters, motor drivers, and LED ballasts.

For engineers reviewing the FZT493TA datasheet, FZT493TA pinout, FZT493TA application, or FZT493TA equivalent, key selection criteria include its 100V V_CEO, low saturation voltage under high-current drive, thermal resistance of 41.7°C/W (50mm × 50mm 2oz Cu), AEC-Q101 qualification, and complementary PNP pairing with FZT593TA.

Technical Context

This NPN bipolar junction transistor operates in linear or saturated switching mode, supporting high-voltage DC control with guaranteed BV_CEO ≥ 100V and BV_CBO ≥ 120V. Its h_FE ranges from 30 to 300 across I_C = 1mA–1A, enabling stable gain in both small-signal amplification and power switching.

Thermal design relies on SOT223's exposed collector tab for heat conduction to PCB copper; R_θJA varies from 41.7°C/W (50mm × 50mm 2oz Cu) to 104°C/W (minimum pad layout). ESD robustness includes 4kV HBM per JEDEC Class 3A.

Key Specifications

Pinout & Package

SOT223 package with molded green compound (UL 94V-0), 0.112g mass, and matte tin-plated leads solderable per MIL-STD-202 Method 208. Exposed collector tab provides primary thermal path to PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXTN2012E6TA and MJD122G, FZT493TA uniquely balances 1A/100V capability, SOT223 thermal performance, AEC-Q101 qualification, and drop-in compatibility with FZT593TA-making it optimal for space-constrained, automotive-grade medium-power switching where reliability and manufacturability are prioritized.

Availability

FZT493TA is available at Aetrix Electronics and suitable for automotive lighting control, industrial DC-DC converter switches, and motor driver for 24V actuators requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for FZT493TA 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 and manufacturing operations across Asia and the US.

FZT493TA belongs to Diodes' high-reliability power transistor product line, engineered specifically for automotive and industrial applications demanding robust voltage tolerance, thermal stability, and AEC-Q101 compliance.

FAQ

What is the maximum allowable junction temperature for FZT493TA?

The FZT493TA has an operating junction temperature range of –55°C to +150°C. Its absolute maximum T_J is +150°C; sustained operation above this threshold risks permanent degradation. Derating begins at +25°C ambient, with power dissipation reduced linearly to zero at +150°C case temperature under specified PCB conditions.

Is FZT493TA pin-compatible with any other SOT223 NPN transistors?

FZT493TA uses standard SOT223 pinout (Emitter-Base-Collector-tab), matching industry convention. However, electrical parameters-including V_CEO, h_FE, and R_θJA-differ significantly from generic SOT223 transistors like MMBT4401 or PN2222A; direct substitution requires validation of gain, saturation voltage, and thermal margin in the target circuit.

Does FZT493TA require a base resistor in switching applications?

Yes. To ensure saturation at I_C = 1A, a base current of ≥100mA is required. With typical V_BE(sat) ≈ 1.15V, a logic-driven base resistor must be sized to deliver ≥100mA from the driver's supply (e.g., 10Ω for 1.2V overhead at 3.3V drive). Undersized resistors cause partial turn-on and excessive power dissipation.

How does the AEC-Q101 qualification impact FZT493TA's use in non-automotive applications?

AEC-Q101 qualification subjects FZT493TA to accelerated stress tests (HTOL, TC, UHAST, etc.) beyond standard industrial requirements, resulting in higher defect detection, tighter parameter distributions, and extended reliability-benefiting any mission-critical application. Non-automotive users gain improved field failure rates and longer service life, especially in harsh environments like factory automation or outdoor power equipment.