Diodes Incorporated UDZ11B-7

Overview

UDZ11B-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 10.76–11.22 V at 5 mA, ±5% tolerance, 30 Ω dynamic impedance at test current, and 0.1 µA maximum reverse leakage at 8.0 V. It operates from –65°C to +150°C and dissipates up to 200 mW in SOD323 package, used for voltage regulation and reference in power supply feedback loops.

For engineers reviewing the UDZ11B-7 datasheet, UDZ11B-7 pinout, UDZ11B-7 application, or UDZ11B-7 equivalent, key selection criteria include zener voltage tightness (±5%), low dynamic impedance (30 Ω), thermal stability (–65°C to +150°C), SOD323 footprint compatibility, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This device functions as a two-terminal voltage reference diode operating in reverse breakdown mode. Its sharp knee and low Z_ZK (60 Ω) ensure stable regulation under low-current conditions, while the 30 Ω Z_ZT at 5 mA supports precise feedback in switching regulator error amplifiers.

The SOD323 package enables high-density PCB layouts and automated assembly, with thermal resistance R_θJA = 625°C/W on FR-4 board. Temperature coefficient is +0.07%/°C typical across its operating range, confirmed in Fig. 8 for 10–15 V devices.

Key Specifications

Pinout & Package

Package: SOD323 - ultra-compact 2-pin surface-mount case (1.30 × 1.70 × 0.95 mm), cathode identified by band marking, matte tin-plated alloy 42 leadframe, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C11LT1G and MMSZ4685T1G, UDZ11B-7 offers tighter thermal performance (–65°C to +150°C vs. –65°C to +150°C and –65°C to +150°C respectively), identical V_Z tolerance, but lower power rating - making it optimal for space-constrained, automotive-qualified shunt references where 200 mW suffices.

Availability

UDZ11B-7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and consumer power adapter feedback circuits requiring stable component supply and AEC-Q101 compliance.

Supply support for UDZ11B-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, serving automotive, industrial, computing, and consumer markets with high-reliability components.

The UDZ series belongs to Diodes' precision Zener diode product line, engineered specifically for voltage reference and regulation in space-constrained, thermally demanding applications where tight V_Z tolerance and AEC-Q101 qualification are mandatory.

FAQ

What is the maximum reverse voltage (V_R) that UDZ11B-7 can withstand before breakdown?

UDZ11B-7 exhibits a maximum reverse leakage current of 0.1 µA at V_R = 8.0 V, and begins controlled Zener breakdown at its specified V_Z range of 10.76–11.22 V. It is not rated for sustained operation below V_Z; operation above 11.22 V must remain within the 200 mW power limit and thermal derating curve.

Is UDZ11B-7 suitable for use in high-frequency noise suppression?

No - UDZ11B-7 is optimized for DC voltage reference and regulation, not RF filtering. Its typical capacitance is ~2.5 pF at 0 V bias (per Fig. 6), too low for effective high-frequency bypassing; TVS or multilayer ceramic capacitors are preferred for EMI suppression.

How does the temperature coefficient affect regulation accuracy over –40°C to +125°C?

Per Fig. 8, UDZ11B-7 has a typical temperature coefficient of +0.07%/°C. Over a 165°C span, this yields ~11.5 mV drift (0.07% × 11 V × 165), resulting in ±0.11 V total V_Z variation - acceptable for most non-precision reference applications but insufficient for metrology-grade systems.

Can UDZ11B-7 replace a 12 V Zener diode in an existing design?

No - UDZ11B-7 is rated 10.76–11.22 V, not 12 V. Substituting it for a 12 V part (e.g., UDZ12B) would reduce regulated voltage by ~0.8–1.2 V, potentially causing undervoltage faults in downstream circuitry; always match nominal V_Z and tolerance bands.