Diodes Incorporated DFLZ15-7

Overview

DFLZ15-7 from Diodes Incorporated is a 15 V, 1.0 W surface-mount power Zener diode in PowerDI123 package, rated for ±5% zener voltage tolerance at 50 mA test current, with 1 Ω typical zener impedance and -55°C to +150°C operating temperature range. It provides precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation for industrial power converters.

For engineers reviewing the DFLZ15-7 datasheet, DFLZ15-7 pinout, DFLZ15-7 application, or DFLZ15-7 equivalent, key selection criteria include its 15 V nominal zener voltage, 1.0 W power dissipation on FR-4 PCB, 110°C/W thermal resistance junction-to-ambient, cathode-band polarity marking, and automotive-qualified variant availability (DFLZ15Q-7).

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and line conditions. Its low 1 Ω typical zener impedance ensures minimal voltage deviation under dynamic current changes, while the PowerDI123 package enables high thermal efficiency via direct cathode-tab soldering to PCB copper.

The device meets JEDEC reliability standards and is qualified for high-reliability applications. Its halogen- and antimony-free "Green" molding compound complies with RoHS 3 (2015/863/EU), and moisture sensitivity level is rated J-STD-020 Level 1.

Key Specifications

Pinout & Package

Package: PowerDI123 - surface-mount, single-ended, cathode-band marked, molded plastic case with matte tin annealed copper leadframe; UL 94V-0 rated, 0.01 g weight.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Compared with BZX84-C15-7 and 1N4744A-TR, DFLZ15-7 delivers superior thermal performance in SMT layouts (110°C/W vs. ~300°C/W for SOT-23), tighter impedance (1 Ω vs. 30 Ω), and automotive-qualified variants - making it optimal for production-grade industrial and automotive power regulation.

Availability

DFLZ15-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, programmable logic controller (PLC) modules, and field instrumentation requiring stable component supply with full traceability and lifecycle management.

Supply support for DFLZ15-7 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, manufacturing, and sales operations across Asia, Europe, and North America.

DFLZ15-7 belongs to the PowerDI® Zener diode product line, engineered for high-reliability voltage regulation and transient suppression in demanding industrial and automotive power systems.

FAQ

What is the maximum continuous reverse current the DFLZ15-7 can handle at 15 V?

The DFLZ15-7 is not rated for continuous reverse current at its zener voltage. Its maximum steady-state power dissipation is 1.0 W, so at 15 V, the absolute maximum average reverse current is 66.7 mA (1.0 W ÷ 15 V). Exceeding this risks thermal runaway; actual design current must stay below derated limits per the power derating curve in Figure 1.

Does DFLZ15-7 have an automotive-qualified version?

Yes - the DFLZ15Q-7 is the AEC-Q200 qualified variant, manufactured under automotive-specific process controls and tested to extended temperature and reliability requirements. It shares identical electrical specs and PowerDI123 packaging but carries separate part numbering and qualification documentation.

How does the PowerDI123 package improve thermal performance versus SOD-123?

PowerDI123 features an exposed cathode tab that bonds directly to the PCB copper, reducing thermal resistance to 9°C/W junction-to-solder point (R_θJS). In contrast, SOD-123 lacks this thermal path, resulting in ~200°C/W R_θJA on FR-4 - making PowerDI123 capable of dissipating 1.0 W without heatsinking where SOD-123 typically maxes out near 0.3 W.

Can DFLZ15-7 be used in series or parallel configurations?

Series connection is acceptable for higher-voltage regulation (e.g., two DFLZ15-7 for ~30 V), provided matched units are selected to balance voltage sharing. Parallel use is strongly discouraged due to negative temperature coefficient mismatch - one device will hog current and fail thermally, even with small V_Z tolerances.