Diodes Incorporated DFLZ24Q-7

Overview

DFLZ24Q-7 from Diodes Incorporated is a 1.0W surface-mount power Zener diode in PowerDI123 package, with nominal Zener voltage 24V (min 22.8V, max 25.6V), Zener impedance 2Ω at 15mA test current, and thermal resistance junction-to-soldering point of 9°C/W. It is AEC-Q101 qualified for automotive applications and features a large exposed cathode pad for enhanced thermal dissipation in voltage regulation and overvoltage protection circuits.

For engineers reviewing the DFLZ24Q-7 datasheet, DFLZ24Q-7 pinout, DFLZ24Q-7 application, or DFLZ24Q-7 equivalent, key selection criteria include its 24V Zener tolerance (±4.2%), low RθJS (9°C/W), AEC-Q101 qualification, RoHS-compliant lead-free finish, and PowerDI123 thermal performance on FR-4 PCBs - critical for automotive body control modules, industrial power supplies, and battery management systems.

Technical Context

This device operates as a precision voltage reference and shunt regulator, maintaining stable output voltage under varying load and input conditions via reverse-biased Zener breakdown. Its 25Ω maximum Zener impedance at IZT = 15mA ensures tight regulation, while the patented interlocking clip design enables high-surge capacity per US Patent #7,095,113.

Thermally, it delivers 1.0W power dissipation on standard 1.5" × 1.5" FR-4 PCBs with 2 oz. copper and 1" × 1" pad layout. The junction-to-soldering-point thermal resistance of 9°C/W supports reliable operation up to +150°C ambient, with derating beginning above +25°C per Figure 1.

Key Specifications

Pinout & Package

Package: PowerDI123 - molded plastic case with large exposed cathode pad (terminal 2) for thermal conduction to PCB; 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-C24LT1G and MMSZ5242BT1G, DFLZ24Q-7 delivers 3.3× higher power handling, 33× lower thermal resistance, and certified automotive reliability - making it the sole choice for under-hood, industrial, or high-surge applications requiring sustained 24V regulation.

Availability

DFLZ24Q-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC-DC converters, battery management systems, and telecom power supply overvoltage protection requiring stable component supply across extended temperature and surge conditions.

Supply support for DFLZ24Q-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 automotive and industrial voltage regulation where thermal robustness, surge immunity, and long-term reliability are mandatory.

FAQ

What is the maximum continuous power dissipation for DFLZ24Q-7 on a standard PCB?

DFLZ24Q-7 dissipates 1.0W continuously when mounted on a 1.5" × 1.5", FR-4 PCB with 2 oz. copper and a 1" × 1" cathode pad layout. Derating begins linearly above +25°C ambient, reaching zero power at +135°C per the published derating curve (Figure 1).

Does DFLZ24Q-7 have a defined forward voltage specification?

Yes - forward voltage is specified as VF = 1.2V maximum at IF = 200mA. This value is relevant for reverse-polarity protection configurations or dual-use as a rectifier in low-current paths, though its primary function remains Zener regulation in reverse bias.

How is the cathode identified on the DFLZ24Q-7 package?

The cathode is marked by a visible band on the top surface of the PowerDI123 case, aligned with Terminal 2 - the large exposed copper pad on the bottom side. This pad must be soldered to a thermal land on the PCB to achieve the specified R_θJS = 9°C/W.

Is DFLZ24Q-7 suitable for use in life support equipment?

No - Diodes Incorporated explicitly prohibits use of DFLZ24Q-7 in life support devices or systems without express written approval from its CEO. It is not authorized for implantable, sustaining-life, or safety-critical medical applications per the product's Life Support Notice.