Diodes Incorporated FZT593TC

Overview

FZT593 from Diodes Incorporated is a 100V PNP medium-power bipolar junction transistor in SOT223 package, rated for -1A continuous collector current and -100V collector-emitter breakdown voltage, with low saturation voltage (V_CE(sat) = -0.2 V at I_C = -250 mA, I_B = -25 mA), used in high-voltage linear regulation and industrial switching circuits.

For engineers reviewing the FZT593 datasheet, FZT593 pinout, FZT593 application, or FZT593 equivalent, key selection criteria include verified BV_CEO ≥ -100 V, thermal resistance R_θJA = 41.7 °C/W (on 50 mm × 50 mm 2 oz Cu), complementary pairing with FZT493, and automotive-grade qualification readiness via AEC-Q101.

Technical Context

This PNP transistor operates in active, saturation, and cutoff regions with DC current gain h_FE ranging from 100 to 300 across I_C = -1 mA to -1 A at V_CE = -5 V. Its f_T of 50 MHz supports moderate-speed switching up to ~100 kHz in hard-switched topologies.

Thermal design relies on its R_θJL of 19.4 °C/W (junction-to-lead) and derated power dissipation: 3.0 W at T_A = 25 °C on 50 mm × 50 mm 2 oz Cu, dropping to 1.2 W under minimum pad layout per J-STD-020 Level 1 moisture sensitivity.

Key Specifications

Pinout & Package

Package: SOT223 (Type DN), surface-mount, 4-terminal plastic molded case with exposed collector tab for thermal conduction and mechanical anchoring. Weight: 0.112 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZTX951 and MJD2955T4G, FZT593 delivers superior thermal efficiency in SOT223, tighter h_FE consistency, and guaranteed -100 V blocking-making it optimal for space-constrained 48 V industrial and automotive modules where voltage margin and thermal density matter.

Availability

FZT593 is available at Aetrix Electronics and suitable for industrial motor control, 48 V telecom power sequencing, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for FZT593 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 North America.

The FZT593 belongs to Diodes' medium-power bipolar transistor product line, engineered for high-voltage industrial switching, linear regulation, and automotive subsystems where reliability, thermal efficiency, and AEC-Q101 readiness are essential.

FAQ

What is the maximum allowable base current for continuous operation?

The absolute maximum continuous base current is -200 mA, as specified in the Absolute Maximum Ratings table. Exceeding this value risks metallization failure or bond wire degradation. For reliable operation, design base drive to stay within -50 mA typical (per V_BE(sat) test condition) with 2× safety margin, especially at elevated junction temperatures.

Can FZT593 be used in avalanche mode?

No-FZT593 is not rated or characterized for controlled avalanche operation. Its BV_CEO = -100 V is a DC breakdown limit under specified test conditions (I_C = -10 mA), not an energy-rated avalanche voltage. Intentional operation beyond V_CEO may cause irreversible device failure due to localized thermal runaway.

Is the SOT223 collector tab electrically isolated from the PCB ground plane?

No-the collector (tab) is electrically connected to the collector lead and must be treated as a live high-voltage node. When mounted on a copper pour, that pour becomes part of the collector circuit. Isolation requires dielectric coating or non-conductive thermal interface material, which degrades R_θJL and is not recommended per Diodes' thermal guidelines.

Does FZT593 meet AEC-Q101 qualification out-of-the-box?

FZT593 is manufactured in IATF 16949-certified facilities and supports PPAP documentation, but final AEC-Q101 qualification requires part-specific testing and customer-defined stress conditions. Diodes offers AEC-Q101-qualified variants (e.g., FZT593Q) with full test reports; standard FZT593TA is qualified to industrial temperature range (-55 °C to +150 °C) and RoHS standards.