Diodes Incorporated ZXTN2038FTA

Overview

ZXTN2038FTA from Diodes Incorporated is an 80 V, 1 A NPN silicon planar medium-power transistor in SOT23 package, featuring V_CE(sat) < 500 mV at 1 A, h_FE ≥ 100 at I_C = 1 mA, and f_T = 150 MHz. It is engineered for high-gain, low-loss switching in power MOSFET gate drive circuits and DC-DC converter primary-side switches.

For engineers reviewing the ZXTN2038FTA datasheet, ZXTN2038FTA pinout, ZXTN2038FTA application, or ZXTN2038FTA equivalent, key selection criteria include V_CEV = 80 V, continuous I_C = 1 A, SOT23 thermal performance under 15 mm × 15 mm FR4 copper, and verified V_BE(sat) = 1.1 V at I_C/I_B = 10.

Technical Context

This NPN transistor uses a planar epitaxial structure optimized for high-voltage breakdown (V_CEV = 80 V) and low saturation voltage (V_CE(sat) ≤ 500 mV @ 1 A). Its gain-bandwidth product (f_T = 150 MHz) supports fast switching in gate-drive applications up to ~100 kHz with minimal delay.

Thermal design relies on SOT23 mounting on 15 mm × 15 mm single-sided 1 oz copper, enabling P_D = 350 mW at T_A = 25 °C. Safe operating area (SOA) curves confirm robustness under pulsed I_C = 2 A (t_p = 100 µs, duty = 2%) with V_CE ≤ 60 V.

Key Specifications

Pinout & Package

SOT23-3 plastic surface-mount package with standard lead frame geometry: 2.80–3.04 mm length, 2.10–2.64 mm width, 1.12 mm max height, 0.95 mm lead pitch. RoHS-compliant, Pb-free construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-power switching applications.

Compared with ZXTN2020ZTA and MMBT4401LT1G, ZXTN2038FTA uniquely delivers 80 V breakdown with 1 A capability and sub-500 mV saturation in SOT23, making it the only option validated for 48 V gate drive and industrial solenoid control without derating.

Availability

ZXTN2038FTA is available at Aetrix Electronics and suitable for power MOSFET gate driving, low-loss DC-DC switching, and industrial motor control applications requiring stable component supply and long-term production continuity.

Supply support for ZXTN2038FTA 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, ISO 9001 and IATF 16949 certified, with design and manufacturing operations across Asia, Europe, and the Americas.

ZXTN2038FTA belongs to the Zetex high-voltage NPN transistor product line, developed specifically for efficient, high-reliability power switching in industrial, telecom, and automotive subsystems where voltage headroom and thermal robustness are critical.

FAQ

What is the maximum safe operating voltage for ZXTN2038FTA in continuous DC applications?

The absolute maximum collector-emitter voltage is V_CEO = 60 V under DC conditions. For transient-tolerant designs, V_CEV = 80 V applies only under pulsed conditions (pulse width ≤ 300 µs, duty cycle ≤ 2%). Continuous operation above 60 V risks premature breakdown and must be avoided.

Can ZXTN2038FTA be used in linear regulator applications?

Yes, but with strict thermal limits. At I_C = 500 mA and V_CE = 10 V, power dissipation reaches 5 W-far exceeding the 350 mW SOT23 rating. Linear use is restricted to low-V_CE (< 1 V), low-I_C (< 350 mA), or short-duration pulses with adequate PCB copper cooling.

Is ZXTN2038FTA pin-compatible with standard SOT23 NPN transistors like MMBT2222A?

No. While both use SOT23-3, ZXTN2038FTA has E-B-C pinout (Emitter=Pin1, Base=Pin2, Collector=Pin3), whereas MMBT2222A uses E-C-B (Emitter=Pin1, Collector=Pin2, Base=Pin3). Swapping them causes immediate circuit failure due to reversed collector/base connections.

Does ZXTN2038FTA require external base current limiting in gate-drive applications?

Yes. With h_FE ≥ 100 at low I_C, but dropping to ~30 at I_C = 1 A, base current must be actively limited to 100 mA for guaranteed saturation. A series resistor (e.g., 33 Ω from 3.3 V logic) prevents excessive I_B and avoids secondary breakdown during switching transitions.