Diodes Incorporated ZVP0545ASTZ

Overview

ZVP0545ASTZ from Zetex Semiconductors (now Diodes Incorporated) is a P-channel enhancement-mode vertical DMOS FET rated for -450 V drain-source voltage, 150 Ω R_DS(on), and -45 mA continuous drain current at 25°C ambient. It operates as a high-voltage, low-current switching device in offline power supplies, CRT flyback timing circuits, and solid-state relay drivers where negative gate control and high breakdown are required.

For engineers reviewing the ZVP0545ASTZ datasheet, ZVP0545ASTZ pinout, ZVP0545ASTZ application, or ZVP0545ASTZ equivalent, key selection criteria include verified -450 V BVDSS, pulsed -400 mA capability, -1.5 to -4.5 V VGS(th), 120 pF Ciss, and TO-92-compatible E-line package compatibility with legacy designs.

Technical Context

This device uses vertical DMOS construction to achieve high-voltage blocking in a through-hole TO-92 package. Its enhancement-mode operation requires negative gate bias relative to source to conduct, with threshold defined at ID = -1 mA under VDS = VGS conditions.

Electrical characterization includes pulsed testing (300 µs width, ≤2% duty cycle) for RDS(on), ID(on), gfs, and switching parameters. Capacitance values (Ciss, Coss, Crss) are measured at VDS = -25 V, VGS = 0 V, f = 1 MHz, supporting snubberless flyback and resonant converter design.

Key Specifications

Pinout & Package

Package: TO-92-compatible E-line (3-lead, straight lead form, plastic molded). Pin identification follows standard Zetex TO-92 orientation: viewed from bottom with leads down and flat side facing left, left-to-right leads are Drain–Gate–Source (D-G-S).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage P-channel switching applications.

Compared with ZVP0545ASTZ, ZVP2106A trades voltage headroom for lower conduction loss in low-voltage systems, while IXTP01P50P provides greater voltage margin and thermal capacity at the cost of board space and gate drive energy - making ZVP0545ASTZ optimal for compact, mains-referenced timing and auxiliary functions.

Availability

ZVP0545ASTZ is available at Aetrix Electronics and suitable for offline AC-DC auxiliary supplies, CRT flyback timing circuits, and solid-state relay drivers requiring stable component supply across long-lifecycle industrial programs.

Supply support for ZVP0545ASTZ 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, now part of Diodes Incorporated, specialized in high-performance discrete semiconductors for precision analog and high-voltage power management.

ZVP0545ASTZ belongs to the ZVP series of high-voltage P-channel MOSFETs designed specifically for timing, auxiliary supply, and signal-level switching in mains-connected equipment where reliability and voltage robustness are critical.

FAQ

What is the maximum gate-source voltage rating for ZVP0545ASTZ?

The absolute maximum V_GS is ±20 V. Exceeding this risks permanent gate oxide damage. In practice, gate drive should be limited to -10 V for reliable R_DS(on) performance and -5 V minimum to ensure full enhancement across temperature, given the -1.5 to -4.5 V V_GS(th) range.

Can ZVP0545ASTZ be used in linear (analog) mode?

No - it is not characterized or guaranteed for linear operation. The device is specified only for switching use under pulsed conditions (≤2% duty cycle). Linear operation would cause uncontrolled thermal runaway due to positive temperature coefficient of R_DS(on) and lack of SOA curves in the datasheet.

Is ZVP0545ASTZ RoHS compliant?

Yes - as a Diodes Incorporated product, ZVP0545ASTZ meets RoHS Directive 2011/65/EU and is halogen-free. The TO-92 package uses lead-free matte tin plating, and the device carries the "Pb-Free" marking per Diodes Inc. packaging standards.

How does the E-line TO-92 package differ from standard TO-92?

E-line TO-92 has straight leads (not formed) and tighter dimensional tolerances than generic TO-92, ensuring consistent insertion into wave-solder fixtures. ZVP0545ASTZ's E-line variant maintains identical pinout (D-G-S) but improves mechanical repeatability in high-volume manufacturing versus standard TO-92 variants.