Diodes Incorporated ZXTP08400BFFTA

Overview

ZXTP08400BFF from Diodes Incorporated is a 400V PNP medium-power high-voltage transistor in SOT23F package, designed for high-blocking-voltage switching applications. It delivers -400V V_CEO, -0.2A continuous collector current, < -220mV V_CE(SAT) at -100mA, h_FE ≥ 100 at -200mA, and 1.5W power dissipation-used in industrial power supplies and HV relay drivers.

For engineers reviewing the ZXTP08400BFF datasheet, ZXTP08400BFF pinout, ZXTP08400BFF application, or ZXTP08400BFF equivalent, key selection criteria include verified high-voltage blocking (BV_CEO = -400V), low saturation voltage under load, thermal performance on defined PCB copper areas, and AEC-Q101 qualification for reliability-critical designs.

Technical Context

This PNP bipolar junction transistor operates in linear and saturated switching modes with guaranteed breakdown voltages up to -400V across collector–emitter and collector–base terminals. Its h_FE remains ≥100 at -200mA/−10V, supporting stable current amplification in high-impedance base drive configurations.

The device uses a thermally enhanced SOT23F package with exposed collector pad, enabling 60°C/W junction-to-ambient thermal resistance when mounted on 50mm × 50mm 2oz copper. ESD robustness includes 4kV HBM and 400V MM ratings per JEDEC standards.

Key Specifications

Pinout & Package

SOT23F is a surface-mount, thermally enhanced plastic package with exposed collector pad, 0.95mm height, and industry-standard 1.9mm lead pitch. It is pin-compatible with SOT23 but offers lower profile and improved power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXTP08400BFF, ZXTP2025EFTA trades 150V blocking headroom for higher current capability but lacks thermal enhancement, while MMDT3906-7-F is functionally incompatible above 40V-making ZXTP08400BFF uniquely suited for 300–400V industrial switching where both voltage and thermal margins are critical.

Availability

ZXTP08400BFF is available at Aetrix Electronics and suitable for industrial power supplies, automotive relay drivers, LED streetlight shunt regulators, and PLC output stages requiring stable component supply and long-term manufacturability.

Supply support for ZXTP08400BFF 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 Americas.

ZXTP08400BFF belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for industrial and automotive applications demanding robust blocking, thermal resilience, and AEC-Q101 reliability in space-constrained SMT packages.

FAQ

What is the maximum continuous collector current for ZXTP08400BFF?

The maximum continuous collector current (I_C) is -0.2A at T_A = +25°C with appropriate PCB copper area (50mm × 50mm 2oz Cu). Derating applies above +25°C ambient: power dissipation drops linearly at 12mW/°C beyond that point, limiting usable current in elevated-temperature environments.

Is ZXTP08400BFF suitable for automotive applications?

Yes-ZXTP08400BFF is qualified to AEC-Q101 standards, covering stress tests such as high-temperature reverse bias, temperature cycling, and unbiased highly accelerated stress testing. Its -55°C to +150°C operating range and 4kV HBM ESD rating meet requirements for under-hood and body-control module deployments.

How does the SOT23F package differ from standard SOT23?

SOT23F retains the same pinout and footprint as SOT23 but features an exposed collector pad for direct thermal conduction to PCB copper, reduced height (0.95mm vs. ~1.1mm), and improved power handling (1.5W vs. ~0.35W typical for SOT23). Mechanical dimensions and soldering profiles are otherwise compatible.

What is the recommended base drive for switching at 100mA collector current?

For reliable saturation at I_C = -100mA, apply I_B = -10mA (h_FE = 10 minimum), confirmed by V_CE(SAT) ≤ -140mV in datasheet. Use a 1kΩ base resistor from a -5V logic source, ensuring V_BE(SAT) ≈ -900mV is met; verify layout avoids parasitic inductance in base path for clean turn-on/turn-off.