Diodes Incorporated ZXT11N15DFTA

Overview

ZXT11N15DFTA from Diodes Incorporated is a 15V NPN low-saturation transistor in SOT23 package, rated for 3A continuous collector current, with V_CE(sat) ≤ 55 mV at I_C = 1 A / I_B = 100 mA and R_sat = 37 mΩ, used as a high-efficiency power switch in DC-DC converters and motor control circuits.

For engineers reviewing the ZXT11N15DFTA datasheet, ZXT11N15DFTA pinout, ZXT11N15DFTA application, or ZXT11N15DFTA equivalent, key selection criteria include saturation voltage under high-current switching, thermal resistance (R_θJA = 155 °C/W at t < 5 s), AEC-Q101 readiness for automotive power management, and SOT23 footprint compatibility with space-constrained PCB layouts.

Technical Context

This NPN bipolar junction transistor is optimized for low-V_CE(sat) operation in saturated-switching mode, supporting fast turn-on (t_on = 110 ns) and turn-off (t_off = 220 ns) with I_C up to 3 A and pulsed I_CM of 5 A. Its h_FE ranges from 150–900 across 10 mA–5 A, enabling stable gain-controlled drive in linear and switching configurations.

The device features a BV_CEO of 15 V and BV_CBO of 40 V, with f_T = 145 MHz at I_C = 50 mA / V_CE = 10 V, confirming suitability for medium-frequency switching applications where gain-bandwidth trade-offs are critical. C_obo = 26 pF at V_CB = 10 V supports predictable capacitive loading in gate-driver or feedback-path designs.

Key Specifications

Pinout & Package

Package: SOT23 - Surface-mount plastic package with matte tin-plated leads, moisture sensitivity level 1, UL 94V-0 rating, and 0.008 g mass.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN low-saturation transistor applications.

Compared with ZXT11N15DFTA, FMMT617 trades off voltage margin and efficiency for direct pin compatibility, while ZXTN2012Z improves voltage and saturation performance at the cost of current rating and requires PCB redesign for thermal pad integration.

Availability

ZXT11N15DFTA is available at Aetrix Electronics and suitable for DC-DC converters, motor controls, and automotive body electronics requiring stable component supply despite its obsolete status-inventory is secured for legacy system support and long-lifecycle production programs.

Supply support for ZXT11N15DFTA 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, manufacturing, and distribution operations across Asia, Europe, and North America.

ZXT11N15DFTA belongs to Diodes' ZXT series of low-saturation NPN transistors, engineered specifically for high-current, low-voltage switching in space-constrained power management and automotive subsystems.

FAQ

Is ZXT11N15DFTA still in production?

No-ZXT11N15DFTA is officially obsolete and discontinued per Diodes' DS33628 Rev. 2-4 (May 2024). Aetrix Electronics maintains limited legacy stock for last-time buy and end-of-life support, but no new wafer fabrication or packaging is scheduled. Customers should migrate to FMMT617 or ZXTN2012Z for new designs.

What is the maximum safe operating temperature for ZXT11N15DFTA?

The device is rated for junction temperatures from –55 °C to +150 °C. At ambient +25 °C on a 25 mm × 25 mm FR4 PCB with 1 oz copper, its R_θJA is 155 °C/W for short-duration pulses (t < 5 s), limiting continuous 3 A operation to ≤85 °C ambient unless heatsinking or airflow is added.

Can ZXT11N15DFTA replace a MOSFET in a 12 V load switch?

Yes-its 15 V V_CEO, 3 A I_C, and 55 mV V_CE(sat) make it viable for 12 V DC load switching where gate-drive simplicity outweighs MOSFET-level R_DS(on). However, base current requirements (~150 mA at 3 A) demand robust GPIO or driver buffering, unlike MOSFET voltage control.

Does ZXT11N15DFTA meet AEC-Q101 qualification?

Per Diodes' documentation, ZXT11N15DFTA is designed and manufactured in IATF 16949-certified facilities and supports PPAP for automotive applications-but formal AEC-Q101 test reports are not published for this specific part. Customers requiring certified qualification should select FMMT617, which carries full AEC-Q101 documentation.