Diodes Incorporated ZVN0545ASTOB

Overview

ZVN0545ASTOB from Zetex Semiconductors (now Diodes Incorporated) is an N-channel enhancement-mode vertical DMOS FET rated for 450 V drain-source voltage, 50 Ω R_DS(on), and 90 mA continuous drain current at 25°C. It operates as a high-voltage switching device in low-power AC/DC flyback snubber circuits and isolated gate driver bias supplies.

For engineers reviewing the ZVN0545ASTOB datasheet, ZVN0545ASTOB pinout, ZVN0545ASTOB application, or ZVN0545ASTOB equivalent, key selection criteria include verified 450 V BVDSS, 50 Ω RDS(on) at VGS = 10 V, 100 mS transconductance, 70 pF input capacitance, and TO-92 compatible E-line package thermal performance.

Technical Context

This vertical DMOS FET uses a planar-gate, epitaxial-drift-layer structure optimized for high-voltage blocking with moderate conduction loss. Its 450 V BVDSS and 10–400 µA IDSS at 450 V confirm stable depletion-mode leakage control under full-rated voltage stress.

Dynamic switching is characterized by 7 ns turn-on delay, 7 ns rise time, 16 ns turn-off delay, and 10 ns fall time at VDD ≈ 25 V and ID = 100 mA - indicating suitability for sub-MHz hard-switched topologies where capacitive charge management is critical.

Key Specifications

Pinout & Package

Package: TO-92 compatible E-line (3-lead plastic), lead-forming variant of standard TO-92 with D-G-S pin sequence matching ZVN0545A.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZVN0545A, ZVN0545ASTOB offers identical performance in tape-and-reel form for production lines; versus DMN2004LK-7, it trades conduction efficiency for essential 450 V isolation capability in mains-referenced designs.

Availability

ZVN0545ASTOB is available at Aetrix Electronics and suitable for offline flyback snubbers, isolated bias supplies, gate driver auxiliary loads, and high-voltage signal switching requiring stable component supply across industrial and consumer power designs.

Supply support for ZVN0545ASTOB 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, acquired by Diodes Incorporated in 2008, specialized in high-performance discrete semiconductors for power management and signal conditioning.

ZVN0545ASTOB belongs to the ZVN series of vertical DMOS FETs designed specifically for high-voltage, low-current switching in cost-sensitive, space-constrained auxiliary power and protection circuits.

FAQ

What is the maximum gate-source voltage for ZVN0545ASTOB?

The absolute maximum gate-source voltage is ±20 V. Exceeding this rating risks permanent gate oxide damage. In practice, gate drive should be limited to 10–15 V for reliable enhancement-mode operation, as VGS(th) ranges from 1 V to 3 V and RDS(on) is specified at VGS = 10 V.

Can ZVN0545ASTOB replace ZVN0545A in existing designs?

Yes - ZVN0545ASTOB is a direct tape-and-reel packaging variant of ZVN0545A with identical electrical characteristics, pinout, and TO-92 E-line mechanical dimensions. No layout or schematic changes are required; only handling and placement process differs.

What is the typical IDSS at elevated temperature?

IDSS is specified as 10–400 µA at VDS = 450 V and VGS = 0 V at 25°C, and up to 400 µA at VDS = 405 V and 125°C. This confirms stable high-temperature leakage behavior critical for snubber reliability in thermally stressed environments.

Is ZVN0545ASTOB suitable for linear regulator applications?

Yes - its 700 mW power dissipation rating at 25°C, 90 mA continuous current, and 50 Ω RDS(on) make it viable for low-power series pass regulation in isolated bias supplies, provided thermal design accommodates junction temperature rise within -55°C to +150°C limits.