Diodes Incorporated ZTX753

Overview

ZTX753 from Diodes Incorporated is a PNP silicon planar medium-power bipolar junction transistor (BJT) designed for linear amplification and switching in high-voltage, medium-current circuits. It delivers V_CEO = −100 V, I_C = −2 A continuous, V_CE(sat) = −0.3 V at I_C = −2 A / I_B = −200 mA, f_T = 140 MHz, and operates up to +200°C junction temperature - used in industrial power supplies and relay drivers.

For engineers reviewing the ZTX753 datasheet, ZTX753 pinout, ZTX753 application, or ZTX753 equivalent, key selection criteria include its −100 V V_CEO, low −0.3 V saturation voltage under full load, TO-92-compatible package thermal performance (R_th(j-amb) = 116 °C/W on PCB), and verified switching behavior (t_on = 40 ns, t_off = 600 ns) in pulsed-load environments.

Technical Context

The ZTX753 operates as a medium-power PNP BJT with fixed-emitter bias topology, supporting both linear amplification (h_FE = 75–225 at I_C = 0.1 A, V_CE = −2 V) and hard-switching applications. Its −120 V V_CBO and −100 V V_CEO ratings enable use in negative-rail high-voltage stages, while the −5 V V_EBO limits base drive headroom.

Thermal design relies on its R_th(j-case) = 70 °C/W and R_th(j-amb) = 116 °C/W (PCB-mounted), with safe operating area validated for single-pulse conditions up to 10 ms at −100 V / −2 A. Switching performance is characterized at −10 V V_CC, −500 mA I_C, and matched −50 mA base drive pulses.

Key Specifications

Pinout & Package

Package: TO-92 compatible (3-lead plastic case, E-line marking). Pin identification follows standard TO-92 orientation: viewed from flat side with leads down, left-to-right is Emitter (E), Base (B), Collector (C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZTX751 and MJD2955, the ZTX753 uniquely balances −100 V blocking, −2 A capability, and TO-92 thermal performance - making it optimal for compact, high-voltage industrial controls where footprint and voltage margin are critical.

Availability

ZTX753 is available at Aetrix Electronics and suitable for industrial relay drivers, negative LDO regulators, high-voltage audio amplifiers, and motor braking circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ZTX753 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 semiconductor company specializing in discrete, analog, and mixed-signal devices for industrial, computing, and consumer markets.

The ZTX753 belongs to Diodes' high-reliability medium-power BJT product line, engineered for robust operation in harsh-temperature industrial power control and signal conditioning applications.

FAQ

Is the ZTX753 RoHS compliant and lead-free?

Yes, the ZTX753 is RoHS compliant and manufactured with lead-free terminations per Diodes Incorporated's standard qualification. The TO-92 package uses matte tin plating over copper leadframe, and all materials meet JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements for surface-mount compatibility.

Can ZTX753 be used in avalanche mode?

No, the ZTX753 is not rated or characterized for controlled avalanche operation. Its safe operating area curves and SOA limits assume non-avalanche switching only. For avalanche-tolerant designs, Diodes recommends the FZT753 - a functionally similar PNP with specified avalanche energy rating (E_AS = 120 mJ).

What is the recommended PCB layout for thermal performance?

For optimal thermal performance, mount the ZTX753 on a 1-inch² copper pour connected to the collector pad via ≥3 thermal vias (0.3 mm diameter, filled). Keep base/emitter traces short and wide to minimize inductance during switching. Avoid placing heat-generating components within 5 mm of the transistor body.

Does ZTX753 require a base resistor in switching applications?

Yes - a series base resistor is mandatory to limit I_B and ensure saturation. For I_C = −2 A, use R_B = (V_BB − V_BE(sat)) / 200 mA. With V_BE(sat) ≈ −0.9 V and V_BB = −5 V, R_B ≈ 20.5 Ω (standard 22 Ω, 0.5 W). Undersized resistors cause incomplete turn-on and excessive V_CE(sat).