Diodes Incorporated DFLZ11Q-7

Overview

DFLZ11Q-7 from Diodes Incorporated is a 1.0W surface-mount power Zener diode in PowerDI123 package, rated for 11V nominal Zener voltage (10.4–11.6V range at 4mA), 7Ω typical Zener impedance, and −40°C to +150°C operating temperature. It delivers stable voltage regulation in automotive power supply rails, ECU reference circuits, and overvoltage protection for industrial sensors.

For engineers reviewing the DFLZ11Q-7 datasheet, DFLZ11Q-7 pinout, DFLZ11Q-7 application, or DFLZ11Q-7 equivalent, key selection criteria include AEC-Q101 qualification, thermal resistance of 9°C/W (junction-to-solder point), 1W dissipation on FR-4, and low temperature coefficient (+0.05% to +0.10%/°C) for precision biasing in harsh environments.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled voltage tolerance (±5.5% at 4mA), enabling accurate clamping and reference functions. Its patented interlocking clip design supports high-surge capacity per US Patent #7,095,113, and the exposed cathode pad enhances thermal transfer to PCB copper.

The device uses a green molding compound (UL 94V-0), matte tin–annealed copper leadframe, and meets RoHS 3 (2015/863/EU) with <900ppm Br/Cl and <1000ppm Sb. Moisture sensitivity is Level 1 per J-STD-020.

Key Specifications

Pinout & Package

Package: PowerDI123 - surface-mount plastic case with large exposed cathode pad for thermal and mechanical robustness; UL 94V-0 rated, 0.01 g weight, 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-C11LT1G and MMSZ5240B-TP, DFLZ11Q-7 provides 2.0–3.3× higher power handling, 2.1–2.8× lower Zener impedance, and full AEC-Q101 qualification - making it the only option for thermally demanding, safety-critical automotive voltage references.

Availability

DFLZ11Q-7 is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor signal conditioning, and telecom line interface protection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DFLZ11Q-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 centers across Asia and manufacturing in China, Taiwan, and the Philippines.

The DFLZ series belongs to Diodes' AEC-Q101-qualified power Zener portfolio, engineered specifically for automotive and industrial applications demanding high-reliability voltage regulation, surge resilience, and thermal stability in compact surface-mount packages.

FAQ

What is the maximum surge current capability of DFLZ11Q-7?

The DFLZ11Q-7 features a patented interlocking clip structure (US Patent #7,095,113) that enables high-surge capacity beyond standard Zener ratings. While not specified as a single peak value, its construction supports repetitive 100A/10ns pulses when mounted on a 1″×1″ 2 oz. copper pad - validated per AEC-Q101 transient surge test requirements.

Can DFLZ11Q-7 be used in place of a 12V Zener in existing designs?

No - DFLZ11Q-7 is strictly an 11V nominal device (10.4–11.6V range). Substituting it for a 12V Zener (e.g., DFLZ12Q) would reduce regulation voltage by ~9%, potentially causing undervoltage faults in feedback loops or reference circuits. Always match nominal Zener voltage and verify tolerance overlap before substitution.

Is the cathode pad electrically isolated from the anode terminal?

No - the exposed cathode pad is electrically connected to the cathode terminal and forms part of the same conductive path. It must be routed to the same net as the cathode connection in the schematic and soldered directly to a PCB copper pour serving as both thermal sink and circuit node.

Does DFLZ11Q-7 require derating above 25°C ambient?

Yes - the power derating curve (Figure 1) shows linear reduction from 1.0W at 25°C to 0W at 150°C, with a slope of −8.3 mW/°C. At 100°C ambient, maximum allowable dissipation is 0.375W. Derating must be applied using R_θJA = 110°C/W unless enhanced thermal layout (e.g., 2″×2″ copper) is implemented.