Diodes Incorporated ZXTN4004KTC

Overview

ZXTN4004KTC from Diodes Incorporated is a 150V NPN bipolar junction transistor optimized for high-voltage LED backlight driving in large-format LCD TVs, featuring BV_CEO ≥ 150 V, h_FE > 100 at I_C = 150 mA / V_CE = 0.25 V, continuous collector current of 1 A, TO252 (DPAK) surface-mount package, and AEC-Q101 qualification for automotive-grade reliability.

For engineers reviewing the ZXTN4004KTC datasheet, ZXTN4004KTC pinout, ZXTN4004KTC application in LED backlight circuits, or ZXTN4004KTC equivalent for high-voltage switching, this page delivers verified electrical parameters, thermal derating curves, JEDEC-compliant ESD ratings (HBM 4 kV), and real-world design context for stable high-current DC-DC driver stages.

Technical Context

This NPN transistor operates as a high-voltage, medium-power switch in constant-current LED string drivers, where its 150 V V_CEO rating enables direct connection to boosted DC bus rails up to 120 V. Its low V_CE(sat) of 0.25 V at I_C = 100 mA / I_B = 5 mA minimizes conduction loss in linear or PWM-controlled dimming stages.

Thermal performance is defined by R_θJL = 12 °C/W (junction-to-leads) and R_θJA = 33 °C/W on a 50 mm × 50 mm 2 oz copper PCB, supporting sustained 1 A operation with appropriate board layout. Transient switching behavior includes t_s = 3413 ns and t_f = 321 ns under V_CC = 120 V, I_C = 150 mA conditions.

Key Specifications

Pinout & Package

Package: TO252 (DPAK), surface-mount, with exposed collector pad for enhanced thermal dissipation. Molded green compound, UL 94V-0 rated, 0.34 g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXTN4004KTC, ZXTN2010Z trades voltage capability for higher current and through-hole ease, while MJD127G offers higher power dissipation but lacks AEC-Q101 validation and 150 V margin-making ZXTN4004KTC uniquely suited for space-constrained, high-reliability LED TV backlight designs.

Availability

ZXTN4004KTC is available at Aetrix Electronics and suitable for LED TV backlight driver designs, automotive display modules, industrial HMI panels, and commercial signage systems requiring stable component supply, AEC-Q101 compliance, and high-voltage switching capability.

Supply support for ZXTN4004KTC 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 electronics markets.

The ZXTN4004KTC belongs to Diodes' high-voltage transistor product line, engineered specifically for energy-efficient LED backlighting in large-area displays where breakdown voltage, thermal efficiency, and automotive qualification are critical.

FAQ

What is the maximum safe operating voltage for ZXTN4004KTC in continuous DC mode?

The absolute maximum collector-emitter voltage (V_CEO) is 150 V, and the device is characterized for stable operation up to this rating under DC conditions with proper heatsinking. Derating is required above +25°C ambient per the published thermal curve; at 100°C case temperature, maximum usable V_CEO remains 150 V but I_C must be reduced to maintain P_D ≤ 3.8 W.

Does ZXTN4004KTC require a base resistor in standard LED driver configurations?

Yes - a current-limiting base resistor is mandatory to ensure I_B stays within 500 mA absolute maximum and provides sufficient drive for target I_C. For 1 A collector current and h_FE ≥ 100, minimum I_B = 10 mA is required; typical designs use 15–20 mA with a resistor calculated from V_BB − V_BE(sat) ≈ 0.95 V.

Can ZXTN4004KTC be used in linear (analog) dimming mode without thermal runaway?

Yes - its positive temperature coefficient of V_BE(on) and stable h_FE vs. temperature (−55°C to +125°C) enable predictable linear regulation. However, power dissipation must remain within 3.8 W (derated per ambient temperature), and PCB copper area must meet the 50 mm × 50 mm 2 oz specification to maintain R_θJA = 33 °C/W.

Is the exposed collector pad on ZXTN4004KTC electrically isolated from other terminals?

No - the exposed collector pad is internally connected to the collector terminal and must be treated as a live high-voltage node. It must be soldered to a dedicated, non-isolated copper pour tied to the collector net; isolation attempts will compromise thermal performance and violate safety clearance requirements.