Diodes Incorporated ZLLS350TA

Overview

ZLLS350TA from Diodes Incorporated is a 40V low-leakage Schottky diode in SOD523 package, delivering 395 mV forward voltage at 30 mA, 4 µA max reverse leakage at 30 V, and 1 ns reverse recovery time-optimized for high-efficiency DC-DC converters, USB power delivery circuits, and LED backlight drivers.

For engineers reviewing the ZLLS350TA datasheet, ZLLS350TA pinout, ZLLS350TA application, or ZLLS350TA equivalent, key selection criteria include VF/IR trade-off at light loads, thermal resistance (303°C/W), SOD523 footprint compatibility, and AEC-Q101 qualification for automotive-grade reliability in space-constrained power rails.

Technical Context

This Schottky diode uses a planar epitaxial construction to minimize junction capacitance (2.5–6 pF at 1 MHz, VR = 30 V) and achieve ultrafast switching (trr ≤ 1 ns). Its low-profile SOD523 package enables integration into thin portable electronics where height clearance is limited to <0.4 mm.

The device operates across –55°C to +150°C with 150°C maximum junction temperature and supports 380 mA continuous forward current-derated to 304 mA at 85°C ambient per thermal data. Reverse breakdown voltage is guaranteed ≥40 V with typical 53 V.

Key Specifications

Pinout & Package

SOD523 is a 2-terminal surface-mount plastic package measuring 1.6 × 0.8 × 0.4 mm (L × W × H), with cathode marked by a band on the top surface. The anode and cathode terminals are formed from annealed matte tin over Alloy 42 leadframe, ensuring MIL-STD-202-compliant solderability.

Key Features

Applications

Availability

ZLLS350TA is available at Aetrix Electronics and suitable for USB-C PD adapters, automotive body control modules, and portable LED driver designs requiring stable component supply with AEC-Q101 compliance and green material certification.

Supply support for ZLLS350TA 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 power management and signal integrity solutions for automotive, industrial, and consumer markets.

The ZLLS350TA belongs to Diodes' low-leakage Schottky diode product line, engineered specifically for high-efficiency, space-constrained DC-DC conversion where VF/IR balance and thermal performance in ultra-small packages are critical.

FAQ

What is the maximum junction temperature and how does it affect layout design?

The ZLLS350TA has a maximum junction temperature of +150°C. With RθJA = 303°C/W on a 25 mm² 1 oz Cu PCB, sustained 380 mA operation requires careful copper area allocation. For 85°C ambient, derating to 304 mA is necessary-designers should use thermal vias under the cathode pad and avoid enclosing the device in thermally isolated zones.

Is ZLLS350TA suitable for reverse polarity protection in 12 V automotive systems?

Yes. Its 40 V VRM rating provides 2× margin over nominal 12 V systems, and AEC-Q101 qualification confirms robustness against automotive thermal cycling and vibration. At –40°C, leakage remains below 0.15 µA (per datasheet Fig. 2), making it effective for low-power always-on modules like door lock controllers.

How does its 1 ns trr compare to standard Schottky diodes in EMI-sensitive applications?

ZLLS350TA's 1 ns reverse recovery time eliminates minority-carrier tail current, preventing high-frequency ringing during turn-off. In 2 MHz boost LED drivers, this reduces conducted EMI above 30 MHz by 8–10 dB compared to 10–20 ns Schottkys-reducing need for ferrite beads or RC snubbers on the output rail.

Can ZLLS350TA replace ZLLS400 in existing designs?

ZLLS400 has higher VRM (45 V) but higher VF (450 mV @ 30 mA) and larger SOD323 package. ZLLS350TA offers lower VF and smaller footprint but reduced voltage margin. Replacement is viable only if system max input is ≤36 V and board space is constrained-thermal validation is required due to different RθJA (303 vs. 370°C/W).