Diodes Incorporated ZTX560

Overview

ZTX560 from 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 ZTX560 datasheet, ZTX560 pinout, ZTX560 application, or ZTX560 equivalent, key selection criteria include verified high-voltage blocking capability (−500 V), low V_CE(sat) (−0.2 V to −0.5 V under I_C = −20 mA to −50 mA), and f_T = 60 MHz for fast-switching linear and pulse applications.

Technical Context

The ZTX560 is a high-voltage PNP bipolar junction transistor optimized for off-line switch-mode power supply (SMPS) flyback converters and horizontal deflection circuits where robust V_CEO/V_CBO ratings and stable h_FE across collector current are critical. It operates with base-emitter turn-on voltage V_BE(on) = −0.9 V at I_C = −50 mA and exhibits C_obo = 8 pF at V_CB = −20 V.

Its switching performance is characterized by t_on = 110 ns and t_off = 1.5 µs under V_CE = −100 V, I_C = −50 mA, and specified base drive conditions, supporting reliable operation in repetitive high-voltage pulse environments.

Key Specifications

Pinout & Package

Package: TO-92 (E-Line) - 3-lead through-hole plastic package with standard lead spacing and outline per Zetex documentation (A = 0.41–0.495 mm, D = 4.37–4.77 mm, L = 13.00–13.97 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZTX550 and BCV61, the ZTX560 uniquely delivers −500 V blocking with TO-92 compatibility-critical for legacy CRT and industrial repair where board layout and voltage margin cannot be compromised.

Availability

ZTX560 is available at Aetrix Electronics and suitable for CRT display repair, offline flyback power supplies, and high-voltage relay driver circuits requiring stable component supply and long-term obsolescence resilience.

Supply support for ZTX560 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

Zetex Semiconductors plc was a UK-based designer of high-performance analog and discrete semiconductors, acquired by Diodes Incorporated in 2008; known for rugged, application-optimized transistors and diodes.

The ZTX series targets high-voltage linear and switching applications-including CRT deflection, SMPS, and industrial controls-with emphasis on reliability, consistent h_FE, and extended temperature operation.

FAQ

Is ZTX560 RoHS-compliant?

No-ZTX560 was released in 2006 prior to full RoHS enforcement for legacy discretes; it contains leaded solder terminations and is exempt under Annex III of Directive 2011/65/EU for high-voltage discrete transistors used in maintenance and repair of existing equipment.

Can ZTX560 replace ZTX550 in existing designs?

Yes, ZTX560 is a direct upgrade for ZTX550 with identical pinout and package, offering +100 V higher V_CEO/V_CBO ratings and comparable h_FE and V_CE(sat); no circuit modification is required for improved voltage margin.

What is the maximum safe operating area (SOA) limit at T_j = 150°C?

Per Zetex Issue 2 datasheet, the SOA is defined by the −500 V/−150 mA boundary at DC, with pulsed limits extending to −500 mA at 300 µs pulse width and 2% duty cycle; derating is required above 25°C ambient per the thermal resistance R_θJA = 150 °C/W.

Does ZTX560 require a heatsink in 1 W continuous operation?

Yes-its P_tot = 1 W rating assumes T_j ≤ 150°C and T_A = 25°C with free-air convection; at full 1 W dissipation, junction temperature exceeds 150°C without heatsinking; a minimum 25 cm² copper pad or small clip-on heatsink is recommended for sustained operation.