Diodes Incorporated UDZ5V1BF-7

Overview

UDZ5V1BF-7 from Diodes Incorporated is a 0.5W surface-mount precision Zener diode in SOD-323F package, rated for 4.98–5.20 V zener voltage at 5 mA test current, with 80 Ω zener impedance and ≤0.5 μA reverse leakage at 1.5 V. It delivers stable voltage reference in low-power analog sensing and power rail regulation circuits.

For engineers reviewing the UDZ5V1BF-7 datasheet, UDZ5V1BF-7 pinout, UDZ5V1BF-7 application, or UDZ5V1BF-7 equivalent, this page provides verified electrical parameters, thermal derating behavior, SOD-323F mechanical layout, RoHS-compliant terminal finish, and real-world substitution guidance for precision 5.1 V reference designs.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable reference voltage across varying load and temperature conditions. Its tight 4.98–5.20 V tolerance (±2.2% typical), low 80 Ω dynamic impedance at 5 mA, and sub-microampere reverse leakage (<0.5 μA @ VR = 1.5 V) support high-accuracy feedback loops in LDOs and ADC references.

Thermal performance is defined by 200 °C/W junction-to-ambient resistance on FR-4 PCB (10 mm × 10 mm pad), enabling predictable power derating above 25 °C ambient - e.g., 350 mW max at +85 °C. The SOD-323F package supports automated placement with cathode-band polarity marking and matte tin–plated copper alloy leads.

Key Specifications

Pinout & Package

SOD-323F is a 2-pin surface-mount plastic package with cathode band marking. Dimensions: 1.25 mm length × 0.71 mm width × 0.40 mm height; pad layout requires 0.30–0.50 mm solder fillet length (L1) and 7° chamfer angles (α1, β1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C5V1LT1G and MMSZ5231B-7-F, UDZ5V1BF-7 uniquely balances ±2.2% tolerance, 80 Ω impedance, and 500 mW dissipation - making it optimal for industrial-grade 16-bit data acquisition where long-term stability and thermal margin are prioritized over lowest-cost or lowest-impedance extremes.

Availability

UDZ5V1BF-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery reference, and medical wearable battery monitoring requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for UDZ5V1BF-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 centers across Asia and manufacturing in China, Taiwan, and the U.S.

The UDZ5V1BF-7 belongs to Diodes' precision Zener diode product line, engineered specifically for high-stability voltage reference applications in space-constrained, thermally demanding environments such as industrial automation and portable medical electronics.

FAQ

What is the maximum allowable reverse voltage before breakdown in UDZ5V1BF-7?

The UDZ5V1BF-7 begins controlled reverse breakdown at its specified zener voltage range of 4.98–5.20 V when tested at 5 mA (I_ZT). Below this threshold - specifically at V_R = 1.5 V - reverse leakage remains ≤0.5 μA. Operation above 5.20 V is permissible only within the device's 500 mW power limit and thermal constraints.

Can UDZ5V1BF-7 be used in place of a 5.0 V Zener diode?

Yes, but with design verification: its nominal 5.1 V rating (4.98–5.20 V) differs from standard 5.0 V Zeners (e.g., 4.8–5.2 V). If circuit tolerance allows ±2.2% deviation and 80 Ω dynamic impedance meets load regulation requirements, it serves as a higher-precision replacement - especially where tighter V_Z distribution improves system calibration yield.

Does UDZ5V1BF-7 require heatsinking on standard FR-4 PCB?

No external heatsink is required. Its 200 °C/W junction-to-ambient thermal resistance is characterized on a standard FR-4 board with 10 mm × 10 mm copper pad. At 25 °C ambient and 500 mW dissipation, junction temperature rises to 125 °C - within the −65 to +150 °C rating. Derating curves (Fig. 1) guide safe operation above 25 °C.

Is the SOD-323F package compatible with reflow soldering per J-STD-020?

Yes. UDZ5V1BF-7's SOD-323F package has moisture sensitivity level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30 °C/60% RH without baking. Its matte tin–plated copper alloy leads meet MIL-STD-202 Method 208 solderability requirements and withstand standard Pb-free reflow profiles (peak 260 °C).