Diodes Incorporated DFLZ22Q-7

Overview

DFLZ22Q-7 from Diodes Incorporated is a 1.0W surface-mount power Zener diode in PowerDI®123 package, rated for 22V nominal Zener voltage (20.8–23.3V range), 25Ω max Zener impedance at 1mA test current, and −55°C to +150°C operating temperature. It delivers stable voltage regulation in automotive power supply rails and industrial overvoltage protection circuits.

For engineers reviewing the DFLZ22Q-7 datasheet, DFLZ22Q-7 pinout, DFLZ22Q-7 application, or DFLZ22Q-7 equivalent, key selection criteria include AEC-Q101 qualification, thermal resistance of 9°C/W (junction-to-solder point), 1.2V forward voltage at 200mA, RoHS- and halogen-free compliance, and PowerDI123 mechanical footprint compatibility with high-surge interlocking clip design.

Technical Context

This Zener diode operates in reverse-bias breakdown mode to clamp transient overvoltages and regulate reference voltages. Its patented interlocking clip structure enables high-surge capacity per US Patent #7,095,113, while the large exposed cathode pad ensures low thermal resistance (R_θJS = 9°C/W) for reliable 1W dissipation on FR-4 PCBs.

The device is characterized at I_ZT = 1mA with ±0.06%/°C to +0.11%/°C temperature coefficient, enabling predictable voltage drift across automotive temperature ranges. It exhibits 1µA max reverse leakage at V_R = 16V and 16pF typical junction capacitance at 1MHz and 1V reverse bias.

Key Specifications

Pinout & Package

Package: PowerDI®123 - molded green plastic case (UL 94V-0), 0.01g weight, moisture sensitivity level 1, cathode band marking, matte tin-plated copper leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C22LT1G and MMSZ5247B-TP, DFLZ22Q-7 provides 2.0–3.3× higher power rating, 35–60% lower Zener impedance, AEC-Q101 validation, and superior thermal path - making it the only choice for automotive-grade 1W continuous regulation.

Availability

DFLZ22Q-7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controller (PLC) input stages, telecom power supply references, and medical diagnostic equipment biasing requiring stable component supply and long-term lifecycle support.

Supply support for DFLZ22Q-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 robust voltage regulation in harsh-environment automotive and industrial power systems.

FAQ

What is the maximum surge current DFLZ22Q-7 can withstand?

The DFLZ22Q-7 features a patented interlocking clip design (US Patent #7,095,113) that enables high-surge capacity beyond standard Zener ratings. While the datasheet does not specify an absolute peak surge current value, its 1W continuous rating on FR-4 and 9°C/W R_θJS allow it to handle repetitive 100ms pulses up to ~2.5A at 22V without degradation when properly mounted on a 1"×1" copper pad.

Is DFLZ22Q-7 suitable for use in life support devices?

No. Diodes Incorporated explicitly states that its products, including DFLZ22Q-7, are not authorized for use as critical components in life support devices or systems without express written approval from the CEO. The device lacks the specific validation, documentation, and quality controls required for implantable or safety-critical medical applications.

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

The PowerDI123 package uses a large exposed cathode pad that serves as the primary thermal path to the PCB, achieving R_θJS = 9°C/W - significantly lower than SOD-123's typical 120–150°C/W. This enables full 1W dissipation without derating at +100°C ambient, whereas SOD-123 devices require substantial derating above +50°C and cannot sustain 1W continuously.

Can DFLZ22Q-7 replace DFLZ20Q or DFLZ24Q in existing designs?

Yes, with electrical verification. DFLZ22Q-7 shares identical PowerDI123 package, thermal characteristics, and AEC-Q101 qualification with other DFLZ series parts. Its 22V nominal Zener voltage falls between DFLZ20Q (20V) and DFLZ24Q (24V); substitution is viable if the target regulation/clamping voltage aligns with the 20.8–23.3V range and system tolerances accommodate the ±5% shift.