Diodes Incorporated ZTX453STOB

Overview

ZTX453STOB from Diodes Incorporated is an NPN silicon planar medium-power transistor rated for 100 V V_CEO, 1 A continuous collector current, and 1 W power dissipation in an E-Line package. It delivers DC current gain (h_FE) of 40–200 at 150 mA and supports peak pulse currents up to 2 A, making it suitable for switching and linear amplification in industrial power supplies and relay drivers.

For engineers reviewing the ZTX453STOB datasheet, ZTX453STOB pinout, ZTX453STOB application, or ZTX453STOB equivalent, key selection criteria include its 100 V V_CEO, 1 A I_C, 1 W P_D, ESD HBM rating of 8 kV, and E-Line through-hole mechanical form factor.

Technical Context

This NPN bipolar junction transistor operates with a minimum BV_CEO of 100 V and supports continuous collector current up to 1 A at T_A = +25°C. Its f_T of 150 MHz enables use in medium-frequency switching and analog amplification stages.

Thermal performance is defined by a -55°C to +150°C operating junction temperature range and 1 W maximum power dissipation at ambient. The device features low V_CE(SAT) ≤ 0.7 V at I_C = 150 mA / I_B = 15 mA and V_BE(SAT) ≤ 1.3 V under the same conditions.

Key Specifications

Pinout & Package

The ZTX453STOB is housed in an E-Line through-hole plastic package with matte tin-plated leads, UL 94V-0 flammability rating, and moisture sensitivity level 1. Weight is approximately 159 mg.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZTX450 and BCP56-10, the ZTX453STOB uniquely balances 100 V standoff, 1 A continuous current, and through-hole mechanical ruggedness-making it optimal for industrial control boards requiring long-term reliability without board redesign.

Availability

ZTX453STOB is available at Aetrix Electronics and suitable for industrial relay drivers, DC-DC converter switches, and linear voltage regulators requiring stable component supply and long-lifecycle support.

Supply support for ZTX453STOB 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 and manufacturing operations across Asia and the Americas.

The ZTX series targets medium-power discrete applications, emphasizing ruggedness, high-voltage capability, and industrial-grade reliability in through-hole packages for control and power interface circuits.

FAQ

What is the maximum safe operating temperature for ZTX453STOB?

The ZTX453STOB has a specified junction temperature range of -55°C to +150°C. Its absolute maximum operating temperature is +150°C, but sustained operation above +125°C requires derating of power dissipation per the thermal resistance curve in DS33268. Ambient temperature limits depend on PCB copper area and airflow.

Is ZTX453STOB suitable for switching inductive loads like solenoids?

Yes - its 100 V V_CEO, 2 A I_CM, and 1 W P_D make it well-suited for solenoid and relay coil switching. A flyback diode is required across the load to clamp inductive kickback; typical V_CE(SAT) ≤ 0.7 V minimizes power loss during conduction.

Does ZTX453STOB have lead-free and RoHS compliance documentation?

Yes - ZTX453STOB is fully RoHS 2 compliant (2011/65/EU), lead-free, halogen-free, and antimony-free per Diodes Incorporated's "Green" definition (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb). Compliance is documented in DS33268 Rev. 3-2 and verified on Diodes' quality portal.

Can ZTX453STOB replace ZTX450 in existing designs?

It can be a drop-in replacement electrically and mechanically, but only if the circuit operates below 60 V. Since ZTX453STOB offers 100 V V_CEO vs. ZTX450's 60 V, it adds margin for transient suppression - however, h_FE distribution differs (40–200 vs. 100–300), so verify bias network stability in linear applications.