Diodes Incorporated UDZ8V2B-7

Overview

UDZ8V2B-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 8.2 V (min 8.02 V, max 8.36 V), 200 mW power dissipation, 30 Ω maximum zener impedance at 5 mA, and ±0.5% voltage tolerance. It operates from −65 °C to +150 °C and is AEC-Q101 qualified for automotive-grade voltage regulation in power supply feedback loops.

For engineers reviewing the UDZ8V2B-7 datasheet, UDZ8V2B-7 pinout, UDZ8V2B-7 application, or UDZ8V2B-7 equivalent, key selection criteria include zener voltage tightness (±0.5%), low dynamic impedance (30 Ω @ 5 mA), thermal resistance (625 °C/W), SOD323 package compatibility with automated assembly, and AEC-Q101 qualification for harsh-environment designs.

Technical Context

This device functions as a two-terminal voltage reference diode operating in reverse breakdown mode. Its sharp knee characteristics and tight 0.5% voltage tolerance enable stable regulation in low-power feedback networks where precision and repeatability are critical.

Designed for operation at 5 mA test current, it delivers 30 Ω zener impedance (ZZT) and 60 Ω knee impedance (ZZK) at 0.5 mA, with only 0.5 µA reverse leakage at 5.0 V. Its temperature coefficient is approximately +0.06 %/°C near 8.2 V, supporting predictable drift behavior in ambient-temperature-varying circuits.

Key Specifications

Pinout & Package

UDZ8V2B-7 uses the SOD323 package: a 2-pin, cathode-banded, surface-mount plastic case measuring 1.30 mm × 1.70 mm × 0.95 mm (typical height). Terminals are matte tin–annealed alloy 42 leads, solderable per MIL-STD-202, Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C8V2 and MMSZ4689, UDZ8V2B-7 offers superior voltage accuracy and automotive qualification in a smaller SOD323 footprint-critical for space-constrained, safety-relevant systems where regulation stability must be maintained across temperature and lifetime.

Availability

UDZ8V2B-7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor transmitters, consumer power adapter feedback circuits, and portable medical device voltage monitors requiring stable component supply with guaranteed long-term continuity.

Supply support for UDZ8V2B-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.

UDZ8V2B-7 belongs to the UDZ3V6B–UDZ15B precision Zener diode family, engineered for high-accuracy voltage reference and regulation in automotive, industrial, and consumer power management systems where tight tolerance and reliability are mandatory.

FAQ

What is the maximum continuous reverse current the UDZ8V2B-7 can sustain without degradation?

The UDZ8V2B-7 is rated for 200 mW power dissipation at 25 °C ambient. At its nominal 8.2 V zener voltage, this corresponds to a maximum continuous reverse current of approximately 24.4 mA (200 mW ÷ 8.2 V). Derating applies above 25 °C per the 625 °C/W thermal resistance curve shown in Figure 1 of DS30290 Rev. 16-2.

Is the UDZ8V2B-7 suitable for use in high-frequency noise suppression applications?

No-this device is optimized for DC and low-frequency voltage regulation, not RF filtering. Its typical capacitance is ~3 pF at 0 V bias (per Fig. 6), and it lacks specified high-frequency impedance or noise rejection characteristics. For noise suppression, TVS diodes or dedicated EMI filters are appropriate alternatives.

Does the cathode band marking indicate polarity during forward or reverse operation?

The cathode band marks the cathode terminal, which must be held at a higher potential than the anode for reverse-bias (zener) operation. In forward bias, the band identifies the P-side connection; in zener mode, it identifies the regulated output node. This marking aligns with industry-standard diode polarity conventions and SOD323 mechanical drawings.

Can UDZ8V2B-7 replace UDZ8V2A in an existing design?

No-UDZ8V2A has ±1% zener voltage tolerance (7.9–8.5 V), while UDZ8V2B specifies ±0.5% (8.02–8.36 V). Substituting without circuit review risks violating regulation accuracy requirements, especially in feedback loops with tight error budgets. The 'B' suffix denotes tighter tolerance and is not a drop-in replacement for 'A'-grade parts.