Diodes Incorporated FZT600TC

Overview

FZT600TC from Diodes Incorporated is a 140V NPN Darlington transistor in SOT223 package, designed for high-voltage switching and amplification with BV_CEO = 140 V, BVCBO = 160 V, I_C = 2 A continuous, h_FE ≥ 1000 at I_C = 50 mA, and V_CE(sat) ≤ 0.75 V at I_C = 500 mA / I_B = 5 mA - used in automotive power control modules and industrial relay drivers.

For engineers reviewing the FZT600TC datasheet, FZT600TC pinout, FZT600TC application, or FZT600TC equivalent, key selection criteria include guaranteed h_FE up to 1 A, AEC-Q101 qualification, RoHS-compliant lead-free finish, and thermal resistance R_θJA = 41.7 °C/W on 50 mm × 50 mm 2 oz copper PCB.

Technical Context

This Darlington pair integrates two NPN transistors in cascade to deliver high current gain (>10 k) while maintaining voltage capability up to 140 V V_CEO. It operates with low base drive requirements due to high h_FE, and supports pulsed I_C up to 4 A with f_T = 150–250 MHz.

Thermal performance is defined across multiple mounting conditions: R_θJA ranges from 41.7 to 104 °C/W depending on copper area and thickness, and R_θJL = 12.9 °C/W enables efficient heat transfer via the collector lead - critical for sustained 2 A operation in compact SOT223 layouts.

Key Specifications

Pinout & Package

Package: SOT223 (Type DN), surface-mount, 4-terminal plastic case with exposed collector tab for thermal and electrical connection. Molded "Green" compound, UL 94V-0 rated, 0.112 g mass.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN Darlington transistor applications.

Compared with ZTX1051A and MJD122, FZT600TC uniquely combines 140 V rating, AEC-Q101 compliance, and SOT223 form factor - making it the only option for space-constrained, high-reliability 12–48 V automotive and industrial switching where both voltage headroom and qualification matter.

Availability

FZT600TC is available at Aetrix Electronics and suitable for automotive relay drivers, industrial solenoid controllers, LED string power switches, and DC motor speed controllers requiring stable component supply and long-term lifecycle support.

Supply support for FZT600TC 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.

FZT600TC belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for ruggedized switching in automotive, industrial, and power management applications where reliability, voltage margin, and thermal efficiency are critical.

FAQ

What is the maximum continuous collector current for FZT600TC?

The FZT600TC supports 2 A continuous collector current at T_A = 25 °C with proper PCB thermal management - specifically, a 50 mm × 50 mm 2 oz copper pad. Derating applies above 25 °C ambient; at 100 °C, max I_C drops to approximately 1.3 A per the thermal derating curve in DS33145 Rev. 5-2.

Is FZT600TC pin-compatible with FZT600B?

Yes - FZT600TC and FZT600B share identical SOT223 pinout, package dimensions, and terminal assignments. The difference lies in h_FE binning: FZT600B guarantees higher minimum gain (e.g., h_FE ≥ 2000 at I_C = 500 mA), while FZT600TC meets the standard FZT600 specification (h_FE ≥ 1000 at I_C = 50 mA).

Can FZT600TC be used in high-frequency switching applications?

FZT600TC has an f_T of 150–250 MHz, supporting clean switching up to ~20 kHz PWM frequencies. However, its Darlington structure introduces slower turn-off (t_off = 2.2 µs) versus single transistors - making it best suited for medium-speed applications like relay/solenoid control, not RF or >100 kHz SMPS topologies.

Does FZT600TC require a heatsink in typical operation?

No external heatsink is required if mounted on ≥50 mm × 50 mm 2 oz copper PCB, where R_θJA = 41.7 °C/W allows full 3.0 W dissipation at T_A = 25 °C. For higher ambient temperatures or smaller copper areas, thermal simulation using the provided R_θJA values (62.5–104 °C/W) is recommended to verify junction temperature stays below 150 °C.