Diodes Incorporated UDZ15B-7

Overview

UDZ15B-7 from Diodes Incorporated is a surface-mount precision Zener diode with a nominal zener voltage of 14.66 V (min 14.34 V, max 14.98 V), 200 mW power dissipation, and 42 Ω dynamic impedance at 5 mA test current. It features tight voltage tolerance, sharp breakdown characteristics, and AEC-Q101 qualification for automotive-grade reliability. It serves as a stable voltage reference in low-power analog circuits and overvoltage protection clamps.

For engineers reviewing the UDZ15B-7 datasheet, UDZ15B-7 pinout, UDZ15B-7 application, or UDZ15B-7 equivalent, key selection criteria include zener voltage accuracy (±2.2% typical), thermal coefficient (≈+0.08%/°C), SOD323 package compatibility, and compliance with automotive stress testing per AEC-Q101.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain a stable reference voltage across its terminals under varying load and temperature conditions. Its design emphasizes low dynamic impedance (42 Ω at I_ZT = 5 mA) and minimal leakage (<0.1 µA at 11.0 V reverse bias), enabling precise regulation in space-constrained PCB layouts.

The device uses an alloy-42 leadframe with matte tin annealed finish, rated for moisture sensitivity level 1 (J-STD-020D), and achieves thermal resistance of 625 °C/W on FR-4 board with recommended pad layout. Its temperature coefficient curve shows positive drift (~+0.08%/°C) above 10 V, consistent with higher-voltage Zener operation.

Key Specifications

Pinout & Package

Package: SOD323 - ultra-compact 2-pin surface-mount case (1.30 × 1.70 × 0.30 mm), UL 94V-0 rated, cathode identified by band marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C15 and MMSZ5245B, UDZ15B-7 offers superior voltage accuracy, automotive qualification, and smallest footprint-making it optimal for space- and reliability-critical automotive and portable medical designs where SOD323 placement is fixed.

Availability

UDZ15B-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, portable medical diagnostics, and consumer IoT power supervisors requiring stable component supply and long-term lifecycle support.

Supply support for UDZ15B-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 stable voltage reference and overvoltage protection in compact, thermally constrained, and automotive-qualified applications.

FAQ

What is the maximum reverse voltage (V_R) that UDZ15B-7 can withstand before breakdown?

The UDZ15B-7 exhibits a guaranteed breakdown onset between 14.34 V and 14.98 V at 5 mA test current. Its absolute maximum reverse voltage rating is not specified separately; operation must remain within the zener region defined by its V_Z range and power limit. Exceeding 200 mW dissipation-even at lower voltages-risks thermal failure.

Is UDZ15B-7 compatible with lead-free reflow soldering profiles?

Yes. UDZ15B-7 is fully RoHS-compliant and rated for lead-free reflow per JEDEC J-STD-020D Level 1 moisture sensitivity. Its matte tin-annealed alloy-42 terminations meet MIL-STD-202 Method 208 solderability requirements and withstand peak reflow temperatures up to 260°C.

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

With a measured TC of +0.08%/°C, UDZ15B-7's zener voltage increases by approximately 117 mV across a 150°C span (14.66 V × 0.0008 × 150). This results in a total drift of ±0.8% relative to nominal V_Z, confirmed by Fig. 8 in DS30290 Rev. 16-2 and validated in AEC-Q101 thermal cycling tests.

Can UDZ15B-7 be used in forward-bias applications like standard diodes?

While it conducts forward current with ~0.9 V drop at 10 mA (per Fig. 2), UDZ15B-7 is optimized for reverse breakdown regulation-not rectification. Its forward characteristics are unspecified beyond typical silicon diode behavior, and no reliability data exists for sustained forward conduction; use dedicated switching diodes for such roles.