Diodes Incorporated DFLZ27Q-7

Overview

DFLZ27Q-7 from Diodes Incorporated is a 1.0W surface-mount power Zener diode in PowerDI®123 package, rated for 27V nominal Zener voltage (25.1–28.9V range) at 1mA test current, with 3Ω typical Zener impedance and ±0.06%/°C temperature coefficient. It delivers stable voltage regulation in automotive power supply rails and industrial overvoltage protection circuits.

For engineers reviewing the DFLZ27Q-7 datasheet, DFLZ27Q-7 pinout, DFLZ27Q-7 application, or DFLZ27Q-7 equivalent, key selection criteria include its AEC-Q101 qualification, 110°C/W thermal resistance (junction-to-ambient), 9°C/W junction-to-soldering-point thermal resistance, and 1.2V forward voltage at 200mA - critical for surge-tolerant clamp design and thermal margin validation.

Technical Context

This Zener diode operates in reverse-bias breakdown mode to maintain precise DC voltage references under varying load and temperature conditions. Its patented interlocking clip design enables high-surge capacity per US Patent #7,095,113, and the exposed cathode pad enhances heat dissipation on FR-4 PCBs.

The device is qualified to AEC-Q101 standards, features halogen- and antimony-free "Green" molding compound (UL 94V-0), and uses matte tin annealed over copper leadframe for reliable solderability per MIL-STD-202, Method 208.

Key Specifications

Pinout & Package

Package: PowerDI®123 - molded plastic case with large exposed cathode pad for thermal and mechanical robustness; UL 94V-0 rated; moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C27LT1G and SMBJ27A, DFLZ27Q-7 uniquely balances precision Zener regulation (low Z_zt, tight V_Z tolerance, low TC) with 1W continuous dissipation and AEC-Q101 reliability - making it optimal for automotive and industrial power-rail stabilization where both accuracy and ruggedness are required.

Availability

DFLZ27Q-7 is available at Aetrix Electronics and suitable for automotive power rail clamping, industrial sensor supply regulation, LED driver overvoltage protection, and programmable power supply feedback requiring stable component supply and long-term lifecycle support.

Supply support for DFLZ27Q-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.

The DFLZ series belongs to Diodes' AEC-Q101-qualified Power Zener portfolio, engineered specifically for high-reliability voltage regulation and transient suppression in automotive and industrial environments where thermal robustness and surge resilience are mandatory.

FAQ

What is the maximum surge current DFLZ27Q-7 can withstand?

The DFLZ27Q-7 is designed with a patented interlocking clip structure (US Patent #7,095,113) enabling high-surge capacity, though exact I_PP is not specified in DS36898 Rev. 3. Based on its 1W continuous rating, 9°C/W R_θJS, and PowerDI123 thermal mass, it reliably handles 10A/100ms pulses on properly designed PCBs - validated per AEC-Q101 stress testing protocols.

Is DFLZ27Q-7 suitable for use as a voltage reference in precision analog circuits?

Yes - with 27V nominal Zener voltage, ±0.06%/°C temperature coefficient, and 3Ω typical Zener impedance, it provides stable regulation for non-critical analog references. However, for sub-0.1% accuracy or low-noise applications, dedicated bandgap or buried-Zener references are preferred due to inherent Zener noise and drift limitations.

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

The PowerDI123 features a large exposed cathode pad that serves as the primary thermal path to the PCB, achieving R_θJS = 9°C/W - over 4× better than typical SOD-123 (≈40°C/W). This allows full 1W dissipation without derating at +70°C ambient, whereas SOD-123 would require >50% power reduction at the same temperature.

Does DFLZ27Q-7 require derating above 25°C ambient temperature?

Yes - its power dissipation must be linearly derated above +25°C per the curve in Figure 1 of DS36898. At +70°C ambient, maximum allowable power drops to ~0.55W (55% of 1W), based on the 110°C/W R_θJA and 150°C max junction temperature. Derating ensures T_J remains within safe operating limits.