Diodes Incorporated ZTX1053ASTZ

Overview

ZTX1053ASTZ from Diodes Incorporated is an NPN silicon planar medium-power high-gain transistor rated for 75 V V_CEO, 3 A continuous collector current, and 10 A pulse current, with V_CE(sat) as low as 120 mV at I_C = 1 A / I_B = 10 mA. It delivers h_FE of 260–450 across 10 mA–3 A, operates from –55 °C to +200 °C, and is used in automotive switching circuits and DC-DC converters.

For engineers reviewing the ZTX1053ASTZ datasheet, ZTX1053ASTZ pinout, ZTX1053ASTZ application, or ZTX1053ASTZ equivalent, key selection criteria include its high h_FE stability at 3 A, low saturation voltage under pulsed drive, E-Line package thermal performance, and AEC-Q101 qualification readiness for automotive power switching.

Technical Context

The ZTX1053ASTZ is a medium-power bipolar junction transistor optimized for linear and switching operation in high-current, high-temperature environments. Its design emphasizes low V_CE(sat) (≤250 mV at I_C = 3 A) and robust secondary breakdown immunity, supported by a 1 W P_tot rating at T_amb = 25 °C and extended T_J range up to +200 °C.

It features a V_(BR)CBO of 150 V, V_CEO of 75 V, and f_T of 140 MHz at I_C = 50 mA/V_CE = 10 V, enabling use in fast-switching DC-DC topologies. C_obo is 21–30 pF at V_CB = 10 V, supporting controlled turn-on/turn-off timing with t_on = 90 ns and t_off = 750 ns under defined test conditions.

Key Specifications

Pinout & Package

The ZTX1053ASTZ uses the E-Line (TO-92 variant) package: molded plastic case with 3 leads, 13.5 mm typical body length, 4.57 mm D dimension, and 3.90 mm E width. Leads are tin-plated copper, compatible with wave and reflow soldering per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZTX1048A and MJD122G, the ZTX1053ASTZ uniquely balances 75 V rating, 3 A capability, and E-Line form factor-making it optimal for space-constrained automotive modules where thermal and electrical margins must coexist within legacy TO-92 footprints.

Availability

ZTX1053ASTZ is available at Aetrix Electronics and suitable for automotive power switching, DC-DC converter design, and industrial relay driver applications requiring stable component supply and long-term lifecycle support.

Supply support for ZTX1053ASTZ 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 sales operations across Asia, Europe, and the Americas.

The ZTX series targets medium-power bipolar transistors for automotive, industrial, and consumer applications where reliability, high gain, and thermal resilience are essential-designed specifically for discrete switching and amplification roles in harsh-environment electronics.

FAQ

Is ZTX1053ASTZ qualified to AEC-Q101?

No, the ZTX1053ASTZ itself is not AEC-Q101 certified per official Diodes documentation. However, Diodes states that parts qualified to AEC-Q101 are available upon request for automotive applications, and the ZTX1053A is manufactured in IATF 16949-certified facilities with PPAP capability-enabling qualification-ready production paths.

What is the maximum safe operating temperature for ZTX1053ASTZ?

The ZTX1053ASTZ has a specified junction temperature range of –55 °C to +200 °C. Its absolute maximum storage and operating temperature is +200 °C, but sustained operation above +150 °C requires careful thermal design due to P_tot derating-thermal resistance θ_JA is not published, so heatsinking must be validated per application layout.

Can ZTX1053ASTZ replace ZTX1053 in existing designs?

Yes, ZTX1053ASTZ is the tape-and-reel packaging variant of the ZTX1053A, sharing identical electrical specifications, pinout, and package dimensions. The "STZ" suffix denotes standard tape-and-reel packaging per EIA-481; no electrical or mechanical differences exist between ZTX1053A and ZTX1053ASTZ.

Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?

Diodes issued this notice because newer alternatives (e.g., MOSFETs with lower R_DS(on) and gate drive simplicity) have superseded BJT-based solutions in many applications. However, the ZTX1053ASTZ remains fully supported for legacy production, repair, and niche analog designs where BJT characteristics-such as linear gain control and SOA robustness-are preferred over MOSFET switching.