Diodes Incorporated ZLLS1000QTA

Overview

ZLLS1000QTA from Diodes Incorporated is a 40V, 1.16A high-current low-leakage Schottky diode in SOT23 package, optimized for DC-DC converter freewheeling and charging circuits. It delivers VF = 470–560 mV at 1 A (25°C), IR ≤ 20 μA at VR = 30 V, and operates up to TJ = +150°C with AEC-Q101 qualification.

For engineers reviewing the ZLLS1000QTA datasheet, ZLLS1000QTA pinout, ZLLS1000QTA application, or ZLLS1000QTA equivalent, key selection criteria include reverse leakage at elevated temperature, forward voltage trade-off at 1A load, thermal resistance (RθJA = 106–155°C/W), and SOT23 footprint compatibility in space-constrained power stages.

Technical Context

This Schottky diode uses a planar epitaxial structure to achieve low VF and ultra-low IR simultaneously. Its junction-to-lead thermal resistance (RθJL = 80°C/W) enables reliable operation under pulsed IFPK = 2.6 A (100μs, 50% duty) without derating in compact layouts.

The device is characterized for stable switching performance: tRR < 5 ns and QRR < 350 nC under IF = 500 mA → VR = 5.5 V transition, supporting high-frequency (>1 MHz) synchronous rectifier replacement in buck converters.

Key Specifications

Pinout & Package

SOT23 surface-mount package with 3 terminals: Anode (Pin 1), Cathode (Pin 2), and No-Connect (Pin 3). Thermally rated to +150°C junction temperature; molded "Green" compound meets UL 94V-0.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky diode applications.

Compared with ZHCS1000Q, ZLLS1000QTA adds AEC-Q101 qualification and wider temperature validation at no VF penalty; versus SB140-E3/54, it delivers 30% lower leakage and 25% better thermal resistance in half the board area-making it optimal for automotive ADAS power rails and USB-C PD adapters.

Availability

ZLLS1000QTA is available at Aetrix Electronics and suitable for DC–DC converters, mobile phone charging circuits, strobe flash drivers, and motor control feedback paths requiring stable component supply across automotive, industrial, and consumer production programs.

Supply support for ZLLS1000QTA 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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.

ZLLS1000QTA belongs to Diodes' AEC-Q101-qualified Schottky portfolio, engineered specifically for high-efficiency, low-leakage power conversion in automotive infotainment, ADAS, and portable electronics.

FAQ

Is ZLLS1000QTA pin-compatible with ZHCS1000Q?

Yes-both use identical SOT23 pinout (Anode–Cathode–NC) and share the same die layout and marking code L10. Mechanical and electrical footprints are interchangeable; however, ZLLS1000QTA adds AEC-Q101 qualification and extended high-temperature leakage validation not present in ZHCS1000Q.

What is the maximum allowable PCB copper area for thermal relief at 1.16A continuous?

With RθJA = 106°C/W (FR4, t<5s test), 1.16A at VF ≈ 0.52V yields ~0.6W dissipation. To maintain TJ ≤ 150°C at TA = 85°C, minimum 25mm × 25mm single-sided 1oz copper is required-matching the JEDEC test condition specified in the datasheet.

Can ZLLS1000QTA replace a standard silicon diode in a 24V motor drive flyback circuit?

Yes-its 40V VR rating and 2.6A IFPK support 24V systems with inductive kickback spikes ≤36V. The <5 ns tRR eliminates tail current, reducing MOSFET stress and EMI versus 1N4007 or MUR120, while VF reduction lowers average power loss by >40% at 1A.

Does ZLLS1000QTA require derating above 85°C ambient?

Yes-derating begins at TA > 25°C per the published curve: at TA = 85°C, max continuous IO drops to ~0.7A (60% of rated 1.16A) to hold TJ ≤ 150°C. This follows linear derating from 1.16A at 25°C to zero at 150°C using RθJA = 106°C/W.