Diodes Incorporated DDZX11C-7

Overview

DDZX11C-7 from Diodes Incorporated is a surface-mount precision Zener diode in SOT23 package, rated for 300 mW power dissipation on FR-4 PCB, with nominal zener voltage 11.1 V (min 10.82 V, max 11.38 V) at 10 mA test current, 10 Ω zener impedance at 10 mA, and 0.1 μA reverse leakage at 8.4 V. It serves as a stable voltage reference in low-power analog regulation and overvoltage protection circuits.

For engineers reviewing the DDZX11C-7 datasheet, DDZX11C-7 pinout, DDZX11C-7 application, or DDZX11C-7 equivalent, this part is selected for tight-tolerance voltage referencing in automotive-grade power management, sensor signal conditioning, and industrial control feedback loops where AEC-Q101 reliability and low temperature coefficient are critical.

Technical Context

This device operates in reverse breakdown mode with sharp knee characteristics, enabling precise clamping and regulation across ambient temperatures from –65 °C to +150 °C. Its thermal resistance of 417 °C/W (junction-to-ambient, FR-4 PCB) defines derating behavior above +25 °C per Figure 1.

Zener impedance remains stable below 120 Ω up to 10 mA, and its temperature coefficient is approximately +0.05 %/°C near 11 V (per Fig. 17), supporting predictable drift compensation in reference designs.

Key Specifications

Pinout & Package

Package: SOT23 - 3-terminal plastic surface-mount package with matte tin–annealed terminals, UL 94V-0 rating, and moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C11LT1G and MMSZ5240B-TP, DDZX11C-7 offers tighter voltage tolerance, lower impedance, and AEC-Q101 qualification in the compact SOT23 package-making it the preferred choice for space-constrained, high-reliability automotive and industrial systems requiring guaranteed long-term stability.

Availability

DDZX11C-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, medical diagnostic equipment, and telecom power sequencing circuits requiring stable component supply across extended temperature ranges and lifecycle continuity.

Supply support for DDZX11C-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, specializing in high-reliability, energy-efficient components for automotive, industrial, and consumer markets.

DDZX11C-7 belongs to the DDZX precision Zener diode product line, designed specifically for applications demanding tight voltage tolerance, low impedance, and AEC-Q101 qualification in miniature SOT23 packaging.

FAQ

What is the maximum continuous reverse current the DDZX11C-7 can sustain without degradation?

The DDZX11C-7 is rated for 10 mA zener test current (I_ZT) and supports continuous operation up to its 300 mW power limit. At 11.1 V, this corresponds to ~27 mA maximum steady-state reverse current. Exceeding this requires thermal derating per Figure 1, and sustained operation above 10 mA increases long-term parameter drift risk.

Does the DDZX11C-7 require a series current-limiting resistor in all applications?

Yes - as a shunt regulator, DDZX11C-7 must be used with a series resistor to limit reverse current and prevent thermal runaway. The resistor value is calculated using (V_IN − V_Z) / I_Z, where I_Z is chosen between 1 mA (for low power) and 10 mA (for optimal impedance and stability).

How does the temperature coefficient of the DDZX11C-7 compare to lower-voltage Zeners in the same family?

Per Figure 17, DDZX11C-7 exhibits a positive temperature coefficient of approximately +0.05 %/°C, consistent with other 10–12 V devices in the DDZX series. This is significantly more stable than 5–6 V Zeners (which show negative TC) and avoids crossover points that cause non-monotonic drift in mid-range references.

Can DDZX11C-7 be used in parallel to increase power handling?

No - Zener diodes cannot be reliably paralleled due to mismatched breakdown voltages causing current hogging. Even minor V_Z variation (±2.5%) leads to unequal current sharing and thermal instability. For higher power, use a single higher-rated device or an active shunt regulator topology.