Diodes Incorporated ZVNL120ASTOB

Overview

ZVNL120ASTOB from Diodes Incorporated is an N-channel enhancement-mode vertical DMOS FET rated for 200 V drain-source voltage, 10 Ω R_DS(on) at V_GS = 5 V and I_D = 250 mA, with a gate threshold voltage of 0.5–1.5 V; it serves as a low-power switching device in telephone handset ringer circuits and signal path control.

For engineers reviewing the ZVNL120ASTOB datasheet, ZVNL120ASTOB pinout, ZVNL120ASTOB application, or ZVNL120ASTOB equivalent, key selection criteria include verified 200 V blocking capability, pulsed drain current up to 2 A, thermal stability across –55 °C to +150 °C, and TO-92-compatible leadform compatibility with legacy handsets and analog interface modules.

Technical Context

This discrete MOSFET operates in enhancement mode with vertical DMOS structure, enabling high-voltage tolerance while maintaining low gate charge (Q_G ≈ 12 nC at V_DS = 50 V) and fast switching (t_d(on) = 8 ns, t_f = 12 ns). Its low 0.5–1.5 V V_GS(th) allows direct drive from 3.3 V or 5 V logic without level-shifting.

Designed for linear and switching operation in low-duty-cycle applications, it exhibits stable R_DS(on) up to 125 °C (normalized to ≤2.2× room-temp value) and minimal IDSS leakage (<100 µA at 200 V, 25 °C), supporting reliable operation in unregulated analog signal paths.

Key Specifications

Pinout & Package

Package: TO-92 compatible molded plastic case with 3-lead vertical through-hole configuration (E-Line TO-92 footprint); leads are tin-plated, RoHS-compliant, and rated for manual or wave soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZVN2110A and BS170, ZVNL120ASTOB uniquely balances 200 V robustness, sub-1.5 V gate threshold, and TO-92 compatibility-making it the only option qualified for direct replacement in legacy telephone ringer circuits without redesign.

Availability

ZVNL120ASTOB is available at Aetrix Electronics and suitable for telephone handset ringer circuits, POTS line interface protection, audio path muting, and DC power sequencing requiring stable component supply across long-lifecycle consumer telecom programs.

Supply support for ZVNL120ASTOB 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 is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, cost-optimized components for consumer, computing, and communications markets.

ZVNL120ASTOB belongs to Diodes' ZVN-series vertical DMOS FET product line, engineered specifically for analog switching and protection in legacy telephony equipment where high-voltage tolerance, low-threshold drive, and through-hole manufacturability remain critical.

FAQ

Is ZVNL120ASTOB suitable for use in 20 Hz AC ring signal switching?

Yes. Its 200 V V_DS rating, 2 A pulsed current capability, and 12 ns fall time ensure clean, low-distortion switching of standard telephone ring signals (75–90 V RMS, 20 Hz) without clipping or thermal stress under typical 2% duty cycle conditions.

Can ZVNL120ASTOB be driven directly from a 3.3 V microcontroller GPIO?

Yes. With a guaranteed V_GS(th) as low as 0.5 V and typical R_DS(on) of 10 Ω at V_GS = 3.3 V (per transfer curve data), it fully enhances using standard 3.3 V logic outputs without external level-shifting circuitry.

What is the maximum continuous drain current at 85 °C ambient?

At T_amb = 85 °C, derating applies per the 700 mW P_tot rating and thermal resistance. Using θ_JA ≈ 180 °C/W (typical for TO-92 on 1-in² copper), max continuous I_D is ~120 mA to maintain T_j ≤ 150 °C, confirmed by normalized R_DS(on) curves showing <2.2× increase at 125 °C junction.

Does ZVNL120ASTOB require a gate resistor for stable switching?

A small gate resistor (10–47 Ω) is recommended to dampen potential oscillation from trace inductance and gate capacitance (C_iss = 85 pF), especially in compact handset PCB layouts; omission may cause ringing but does not impair basic functionality per datasheet test conditions.