Diodes Incorporated ZVP0545A

Overview

ZVP0545A from Zetex (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. It operates as a high-voltage, low-current switching device in off-line power supply standby circuits, LED driver bias paths, and high-side sensing applications.

For engineers reviewing the ZVP0545A datasheet, ZVP0545A pinout, ZVP0545A application, or ZVP0545A equivalent, key selection factors include verified -450 V BVDSS, pulsed -400 mA capability, TO-92-compatible E-Line package, gate threshold range (-1.5 to -4.5 V), and measured Ciss of 120 pF at -25 V.

Technical Context

This device uses vertical DMOS structure to achieve high breakdown voltage with stable R_DS(on) across temperature. Its enhancement-mode operation requires negative gate drive relative to source, and it exhibits low gate leakage (≤20 nA) at ±20 V V_GS.

Electrical characterization confirms hard-switching suitability: t_d(on) = 10 ns, t_r = 15 ns, t_d(off) = 15 ns, and t_f = 20 ns under -25 V V_DD and -50 mA I_D conditions, with C_oss = 20 pF and C_rss = 5 pF enabling predictable turn-off behavior in flyback snubber networks.

Key Specifications

Pinout & Package

Supplied in an E-Line TO-92-compatible plastic package with standard lead configuration: Drain (D), Gate (G), Source (S) - leads arranged in linear D-G-S order when viewed from front with flat side facing up and leads down.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZVP0545A, ZVP2106A and BSP170 offer lower R_DS(on) and higher current but lack the -450 V capability essential for direct mains-connected auxiliary supplies - making ZVP0545A irreplaceable in high-voltage isolation barrier biasing without additional protection circuitry.

Availability

ZVP0545A is available at Aetrix Electronics and suitable for AC/DC auxiliary supplies, isolated feedback bias networks, and standby power switches requiring stable component supply across extended temperature ranges and long-lifecycle programs.

Supply support for ZVP0545A 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 transistors and analog ICs for power management and signal conditioning.

ZVP0545A belongs to the ZVP series of high-voltage P-channel MOSFETs designed specifically for reliable, low-power auxiliary supply switching in off-line power conversion systems.

FAQ

What is the maximum allowable gate-source voltage for ZVP0545A?

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 to ensure robust turn-on while maintaining margin against transients, especially in unregulated auxiliary supplies where gate voltage may float during startup.

Can ZVP0545A be used in linear regulator applications?

No - its 150 Ω R_DS(on) and 700 mW power dissipation limit usable linear regulation to sub-mA loads at low V_DS. It is optimized for switching operation, not analog pass elements. For linear bias, consider ZVP3306A or similar low-R_DS(on) alternatives.

Is ZVP0545A RoHS compliant?

Yes - Diodes Incorporated confirms RoHS compliance for ZVP0545A per EU Directive 2011/65/EU, with lead-free matte tin lead finish and halogen-free molding compound. Full compliance documentation is available under Diodes Inc. part number ZVP0545A-TP.

Does ZVP0545A require a gate resistor in typical applications?

A 10–47 Ω series gate resistor is recommended to dampen ringing caused by gate-drain capacitance interaction, particularly in high-dV/dt environments like flyback primary switching nodes. This improves EMI performance and prevents false triggering without compromising 10 ns turn-on delay.