Diodes Incorporated ZXTP07040DFFTA

Overview

ZXTP07040DFF from Diodes Incorporated is a 40V PNP low-saturation bipolar junction transistor in SOT23F package, designed for high-gain switching with V_CE(SAT) < −100 mV at −1 A, R_CE(SAT) = 67 mΩ, and h_FE ≥ 200 @ −1 A. It serves as a load switch, gate driver, or motor drive element in space-constrained power management circuits.

For engineers reviewing the ZXTP07040DFF datasheet, ZXTP07040DFF pinout, ZXTP07040DFF application, or ZXTP07040DFF equivalent, key selection criteria include guaranteed −40 V V_CEO, AEC-Q101 qualification, thermal resistance of 60 °C/W (50 mm × 50 mm 2 oz Cu), −3 A continuous I_C, and SOT23F footprint compatibility with standard SOT23 layouts.

Technical Context

This PNP transistor employs epitaxial planar die construction optimized for low V_CE(SAT) and high DC current gain across −55 °C to +150 °C operating range. Its safe operating area supports pulsed I_C up to −6 A with defined transient thermal impedance curves for 100 μs–1 s pulses.

The device features complementary NPN pairing with ZXTN07045EFF, enabling matched push-pull designs. Its −7 V V_EBO and −3 V V_ECO ratings support robust reverse-bias operation in bidirectional control paths and battery protection circuits.

Key Specifications

Pinout & Package

SOT23F is a low-profile surface-mount plastic package with exposed collector pad for enhanced thermal performance. It maintains pin compatibility with industry-standard SOT23 but delivers higher power density via improved thermal path to PCB copper.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP switching transistor applications.

Compared with ZXTP07040DFF, ZXTP07040DFTA offers identical performance without automotive qualification, while MMBT3906LT1G lacks the current capacity, thermal capability, and saturation voltage needed for high-efficiency power switching-making it incompatible for load, gate drive, or motor applications.

Availability

ZXTP07040DFF is available at Aetrix Electronics and suitable for battery charging control, MOSFET gate driving, and automotive siren driver applications requiring stable component supply, AEC-Q101 compliance, and high thermal reliability in compact SMT packages.

Supply support for ZXTP07040DFF 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 components for automotive, industrial, and consumer markets with ISO/TS 16949 and ISO 14001 certifications.

This device belongs to Diodes' high-performance PNP transistor product line, engineered specifically for low-loss, high-current switching in space-constrained power management systems where thermal density and AEC-Q101 reliability are mandatory.

FAQ

What is the maximum allowable continuous collector current for ZXTP07040DFF?

The ZXTP07040DFF supports −3 A continuous collector current at T_A = +25 °C with appropriate PCB copper area (50 mm × 50 mm, 2 oz). Derating applies above 25 °C: power dissipation drops linearly at 12.0 mW/°C beyond 25 °C ambient, limiting usable I_C in elevated temperature environments.

Does ZXTP07040DFF require a heatsink for 1.5 W operation?

No external heatsink is required for 1.5 W operation when mounted on a 50 mm × 50 mm 2 oz copper pad, as its R_θJA is specified at 60 °C/W under that condition. At 25 °C ambient, junction temperature rises to 115 °C (25 + 1.5 × 60), remaining within the −55 °C to +150 °C rated range.

How does the SOT23F package differ electrically from standard SOT23?

SOT23F has identical pinout and footprint compatibility with SOT23 but integrates an exposed collector pad that lowers thermal resistance by ~30% (R_θJA = 60 °C/W vs. ~85 °C/W for standard SOT23). Electrically, it supports higher continuous current (−3 A vs. typically −1.5 A) due to improved heat spreading into PCB copper.

Can ZXTP07040DFF be used in linear amplifier configurations?

No-it is optimized for saturated switching, not linear operation. Its h_FE variation across I_C (450 at −10 mA down to 80 at −3 A) and lack of SOA curves for linear biasing make it unsuitable for analog amplification. Use only in digital on/off or pulse-width modulated switching modes.