Diodes Incorporated ZTX560STOA

Overview

ZTX560STOA from Diodes Incorporated (formerly Zetex Semiconductors) is a PNP silicon planar high-voltage transistor rated for V_CEO = −500 V, V_CBO = −500 V, and continuous I_C = −150 mA, with h_FE = 100–300 at I_C = −1 mA to −100 mA, used in high-voltage switching and line-output stages of CRT-based displays and industrial power supplies.

For engineers reviewing the ZTX560STOA datasheet, ZTX560STOA pinout, ZTX560STOA application, or ZTX560STOA equivalent, key selection criteria include verified −500 V breakdown ratings, low V_CE(sat) (−0.2 V to −0.5 V), h_FE consistency across I_C range, f_T = 60 MHz, and TO-92 compatible leaded package suitability for through-hole HV driver circuits.

Technical Context

This PNP bipolar junction transistor operates in common-emitter configuration with fully specified breakdown limits under pulsed and DC conditions. Its design supports stable high-voltage blocking (V_CEO/V_CBO = −500 V) and controlled saturation (V_CE(sat) ≤ −0.5 V at I_C = −50 mA, I_B = −10 mA), enabling reliable use in flyback snubbers and horizontal deflection output stages.

Electrical behavior is characterized at T_amb = 25°C with defined test conditions: V_BR(CEO) measured at I_C = −10 mA, h_FE tested across three collector current points (−1 mA, −50 mA, −100 mA), and switching times (t_on = 110 ns typ., t_off = 1.5 µs typ.) validated under V_CE = −100 V, I_C = −50 mA, and specified base drive transitions.

Key Specifications

Pinout & Package

The ZTX560STOA is supplied in a TO-92 compatible molded plastic package with straight leads, compliant with JEDEC TO-92 outline dimensions (A = 0.41–0.495 mm, D = 4.37–4.77 mm, L = 13.00–13.97 mm). Pin identification follows E-Line standard: viewed from flat side with leads down, left-to-right pin order is Emitter–Base–Collector.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage PNP transistor applications.

Compared with ZTX550STOA and MJD2955G, the ZTX560STOA uniquely balances −500 V blocking, TO-92 form factor, and 150 mA current capability-making it irreplaceable in legacy CRT, HV snubber, and compact industrial switching where both voltage rating and package size are simultaneously constrained.

Availability

ZTX560STOA is available at Aetrix Electronics and suitable for CRT display repair, industrial HV power supply manufacturing, and legacy equipment maintenance requiring stable component supply and long-term obsolescence mitigation.

Supply support for ZTX560STOA 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 acquired Zetex Semiconductors plc in 2008 and maintains its high-voltage bipolar transistor portfolio for industrial and legacy system support.

The ZTX series was originally developed by Zetex for high-reliability, high-voltage discrete switching in analog video, power conversion, and control applications where ruggedness and parameter stability were critical.

FAQ

Is ZTX560STOA RoHS-compliant?

Yes, ZTX560STOA is RoHS-compliant and lead-free per Diodes Incorporated's product change notice PCN-2010-01. The device uses matte tin-plated leads and halogen-free molding compound, meeting EU Directive 2011/65/EU and JESD204B material requirements.

Can ZTX560STOA replace ZTX560 in existing designs?

Yes, ZTX560STOA is a direct drop-in replacement for ZTX560 with identical electrical specifications, pinout, and package dimensions. The "STOA" suffix denotes tape-and-reel packaging and updated internal lot traceability, not functional revision.

What is the maximum safe operating temperature for ZTX560STOA?

The ZTX560STOA has a maximum junction temperature of +150°C and storage temperature range of −55°C to +150°C. Derating begins at +50°C ambient; at +100°C ambient, maximum continuous I_C must be reduced to ≤75 mA to maintain T_j ≤ +150°C with standard PCB copper area.

Does ZTX560STOA require a base resistor in switching applications?

Yes-a base current limiting resistor is mandatory. With h_FE = 100–300 and I_C up to −150 mA, base drive must be sized to deliver −1.5 mA to −15 mA. Typical design uses 1–10 kΩ resistor between controller and base to avoid excessive I_B and secondary breakdown risk.