Diodes Incorporated ZXTN4004ZQTA

Overview

ZXTN4004ZQTA from Diodes Incorporated is a 150V NPN bipolar junction transistor optimized for high-voltage LED backlight driving in large-screen TVs, featuring BV_CEO > 150 V, I_C = 1 A continuous current capability, h_FE > 100 at I_C = 150 mA / V_CE = 0.25 V, and AEC-Q101 qualification for automotive-grade reliability.

For engineers reviewing the ZXTN4004ZQTA datasheet, ZXTN4004ZQTA pinout, ZXTN4004ZQTA application, or ZXTN4004ZQTA equivalent, key selection criteria include high-voltage blocking (150 V V_CEO), low saturation voltage (≤0.25 V at I_C = 100 mA / I_B = 5 mA), thermal performance on SOT89 copper pads, and automotive-compliant PPAP readiness.

Technical Context

This NPN transistor operates as a high-side switch in constant-current LED string drivers, where its 150 V V_CEO rating enables direct connection to boosted DC bus voltages up to 120 V in TV backlight architectures. Its h_FE ≥ 100 at low V_CE (0.25 V) ensures stable gain under saturated switching conditions critical for precise current regulation.

Thermal design relies on the exposed collector pad of the SOT89 package: R_θJL = 13 °C/W to the solder point, with R_θJA dropping from 125 °C/W (15 mm × 15 mm 1 oz Cu) to 60 °C/W (50 mm × 50 mm 1 oz Cu), enabling 2.0 W steady-state dissipation under optimized PCB layout.

Key Specifications

Pinout & Package

The ZXTN4004ZQTA is housed in a surface-mount SOT89 package with an exposed collector pad for enhanced thermal transfer. The molded plastic case meets UL 94V-0 flammability rating and uses halogen/antimony-free "Green" compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXTN4004ZTA, the ZXTN4004ZQTA adds PPAP capability and automotive traceability without electrical trade-offs; versus MJD127G, it delivers 50% higher voltage rating, 50% lower saturation loss, and 40% better thermal resistance in half the footprint area.

Availability

ZXTN4004ZQTA is available at Aetrix Electronics and suitable for LED TV backlight driver designs, automotive display modules, and industrial panel lighting systems requiring stable component supply, automotive-grade reliability, and high-voltage switching capability.

Supply support for ZXTN4004ZQTA 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 applications.

The ZXTN4004ZQTA belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for energy-efficient LED current switching in demanding backlight and signage applications.

FAQ

What is the maximum safe operating voltage for ZXTN4004ZQTA in continuous DC mode?

The ZXTN4004ZQTA is rated for V_CEO = 150 V minimum, meaning it can safely block up to 150 V between collector and emitter under DC conditions. Operation above this voltage risks avalanche breakdown and permanent damage, even with current limiting. Designers must maintain at least 20% derating (≤120 V) for long-term reliability in high-temperature environments.

How does the SOT89 package's exposed collector pad affect PCB layout?

The exposed collector pad on the SOT89 package must be soldered directly to a dedicated copper pour connected to the high-voltage LED return path. Minimum recommended pad size is 15 mm × 15 mm of 1 oz copper; increasing to 50 mm × 50 mm reduces R_θJA from 125 °C/W to 60 °C/W. Thermal vias under the pad are mandatory for sustained 1 A operation.

Can ZXTN4004ZQTA replace a MOSFET in LED current-switching applications?

Yes, but with trade-offs: the ZXTN4004ZQTA offers lower gate-drive complexity than a MOSFET (no gate charge, no level-shifting needed), but requires ~5 mA base current versus near-zero gate current. Its 0.25 V V_CE(sat) yields lower conduction loss than many 150 V MOSFETs at <200 mA, but switching speed (t_s = 3413 ns) is slower than modern SiC or GaN devices.

Is ZXTN4004ZQTA compatible with lead-free reflow profiles?

Yes - the device is fully RoHS-compliant and rated for standard lead-free reflow profiles (JEDEC J-STD-020, peak temperature 260°C). Its matte tin-plated leads meet MIL-STD-202 Method 208 solderability requirements, and the "Green" molding compound is qualified for Pb-free assembly without delamination or popcorning up to MSL Level 1 humidity exposure.