Diodes Incorporated UDZ7V5B-7

Overview

UDZ7V5B-7 from Diodes Incorporated is a surface-mount precision Zener diode with a nominal zener voltage of 7.5 V, ±3% tolerance (7.28–7.60 V), 200 mW power dissipation, 30 Ω dynamic impedance at 5 mA, and AEC-Q101 qualification for automotive-grade reliability. It serves as a stable voltage reference or overvoltage clamp in low-power analog and power management circuits.

For engineers reviewing the UDZ7V5B-7 datasheet, UDZ7V5B-7 pinout, UDZ7V5B-7 application, or UDZ7V5B-7 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (625 °C/W), SOD323 package compatibility, reverse leakage (<0.5 µA at 4.0 V), and automotive qualification status.

Technical Context

This device operates as a two-terminal voltage regulation element relying on controlled reverse-biased avalanche breakdown. Its sharp knee characteristic and tight 3% V_Z tolerance enable precise DC reference generation in space-constrained designs.

Thermal performance is defined by R_θJA = 625 °C/W on FR-4 PCB with recommended pad layout, and it maintains stable regulation across –65 °C to +150 °C operating temperature range. The cathode band marking identifies polarity for correct PCB orientation.

Key Specifications

Pinout & Package

Package: SOD323 - ultra-compact 2-pin surface-mount plastic case (1.30 mm × 1.70 mm × 0.95 mm), UL 94V-0 rated, moisture sensitivity level 1, matte tin-plated alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C7V5 and MMSZ5235B, UDZ7V5B-7 offers tighter voltage tolerance, lower dynamic impedance, smaller SOD323 footprint, and automotive qualification-making it optimal for space-limited, high-reliability reference and clamping roles where accuracy and qualification matter.

Availability

UDZ7V5B-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, portable medical diagnostics, and consumer IoT power rails requiring stable component supply and long-term lifecycle support.

Supply support for UDZ7V5B-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 UDZ series belongs to Diodes' precision Zener diode product line, engineered specifically for high-stability voltage reference and overvoltage protection in automotive, industrial, and portable electronics where accuracy, reliability, and compact packaging are critical.

FAQ

What is the maximum reverse voltage (V_R) this Zener can withstand before breakdown?

The UDZ7V5B-7 exhibits specified reverse leakage (I_R) ≤ 0.5 µA at V_R = 4.0 V. Breakdown begins near its nominal 7.5 V zener voltage, with full regulation established at V_Z = 7.28–7.60 V under 5 mA test current. It is not rated for sustained reverse operation below V_Z; operation above V_Z must remain within 200 mW power limit.

Is the SOD323 package compatible with standard reflow profiles for lead-free soldering?

Yes. The UDZ7V5B-7's SOD323 package uses matte tin annealed terminals and is qualified for lead-free reflow per J-STD-020D Level 1 moisture sensitivity. Its alloy 42 leadframe supports peak temperatures up to 260 °C, matching IPC/JEDEC J-STD-020 standard profiles for Pb-free assembly without delamination or solderability degradation.

How does temperature affect the zener voltage stability of UDZ7V5B-7?

At ~7.5 V, the UDZ7V5B-7 exhibits a positive temperature coefficient of approximately +0.05 %/°C (per Fig. 7). This means V_Z increases by ~3.75 mV per °C rise - a predictable, linear shift that enables compensation in precision references. Full stability is maintained across –65 °C to +150 °C operating range without parameter shift beyond datasheet limits.

Can UDZ7V5B-7 replace a 7.5 V Zener in a current-source configuration?

Yes - its 30 Ω dynamic impedance at 5 mA and sharp breakdown allow stable current-source operation when paired with a series resistor. For example, with 12 V supply and 600 Ω resistor, it delivers ~5 mA through the diode while holding V_Z within ±3%. Ensure power dissipation remains ≤200 mW and derate linearly above 25 °C ambient using the 625 °C/W thermal resistance curve.