Diodes Incorporated FZT796ATC

Overview

FZT796ATC from Diodes Incorporated is a 200V PNP medium-power high-gain bipolar junction transistor in SOT223 package, rated for -500mA continuous collector current, with hFE > 300 at -10mA and V_CE(sat) ≤ -300mV at -200mA/-20mA, used in high-voltage battery-powered switching and linear regulation circuits.

For engineers reviewing the FZT796ATC datasheet, FZT796ATC pinout, FZT796ATC application, or FZT796ATC equivalent, key selection criteria include breakdown voltage (BV_CEO = -200V), thermal resistance (R_θJA = 62.5°C/W on 25mm × 25mm PCB), ESD robustness (HBM = 4kV), AEC-Q101 qualification, and complementary pairing with FZT696B.

Technical Context

This PNP transistor operates in active, saturation, and cutoff regions with guaranteed BV_CEO and BV_CBO of -200V, enabling use in high-side switch configurations up to 200V rail. Its high DC current gain (hFE ≥ 300 @ -10mA) supports low-base-drive designs in discrete amplifier and driver stages.

Thermal performance is defined for two mounting conditions: R_θJA = 62.5°C/W (25mm × 25mm 2oz copper) and 41.7°C/W (50mm × 50mm 2oz copper), with R_θJL = 12.9°C/W indicating efficient heat conduction through the collector lead. Transient thermal impedance curves support pulsed operation up to 3.2µs turn-off time.

Key Specifications

Pinout & Package

Package: SOT223 - Surface-mount plastic package with exposed collector tab for thermal and electrical connection; 0.112g mass; UL 94V-0 rated molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZTX951 and MJD2955T4G, FZT796ATC uniquely balances 200V capability, SOT223 surface-mount compatibility, AEC-Q101 qualification, and 500mA rating-making it optimal for space-constrained, high-reliability 100–200V switching where thermal design must rely on PCB copper rather than external heatsinks.

Availability

FZT796ATC is available at Aetrix Electronics and suitable for automotive lighting control, industrial DC power switching, battery management systems, and medical portable equipment requiring stable component supply across extended production lifecycles.

Supply support for FZT796ATC 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, application-optimized components for automotive, industrial, and consumer markets.

FZT796ATC belongs to Diodes' high-voltage bipolar transistor product line, designed specifically for robust, thermally efficient high-side switching in automotive and industrial power systems where voltage margin, gain consistency, and qualification rigor are critical.

FAQ

What is the maximum safe operating voltage for FZT796ATC in continuous DC applications?

The absolute maximum collector-emitter voltage (V_CEO) is -200V, and operation above -180V DC is not recommended without derating for temperature and transients. At T_J = 125°C, the usable V_CEO reduces to approximately -160V per the datasheet's derating curve. For 170V bus applications, a 20% margin is maintained under worst-case thermal conditions.

Can FZT796ATC be used in parallel for higher current handling?

No-FZT796ATC lacks built-in emitter ballasting or matched V_BE characteristics required for stable current sharing. Parallel operation risks thermal runaway due to positive temperature coefficient of hFE and mismatched saturation voltages. For >500mA, use a single higher-rated device like MJD2955T4G or redesign with current-sharing resistors and thermal coupling.

Is the exposed collector tab electrically isolated from other pins?

No-the SOT223 collector tab is internally bonded directly to the collector semiconductor region and is not insulated. It must be treated as an active circuit node: either connected to system ground (if used as low-side switch) or to the high-voltage rail (if used as high-side switch), with appropriate creepage/clearance per IPC-2221 for the operating voltage.

Does FZT796ATC support PWM switching at frequencies above 10kHz?

Yes-its f_T = 100MHz and turn-off time t_off = 3.2µs allow clean switching up to ~100kHz in hard-switched applications. However, at >50kHz, layout parasitics dominate; keep base drive loop area minimal, use low-inductance gate resistors, and ensure collector tab has low-impedance thermal path to minimize oscillation during transitions.