Diodes Incorporated UDZ9V1BQ-13

Overview

UDZ9V1BQ-13 from Diodes Incorporated is a surface-mount precision Zener diode with nominal 9.1 V breakdown voltage (8.85–9.23 V), 200 mW power rating, and ±1.5% tolerance at 5 mA test current; it serves as a stable voltage reference in automotive power-supply regulation and sensor biasing circuits.

For engineers reviewing the UDZ9V1BQ-13 datasheet, UDZ9V1BQ-13 pinout, UDZ9V1BQ-13 application, or UDZ9V1BQ-13 equivalent, key selection criteria include Zener voltage tightness (±1.5%), low Zener impedance (30 Ω @ 5 mA), AEC-Q101 qualification, SOD323 package thermal resistance (625 °C/W), and automotive-grade traceability.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain precise DC voltage regulation under varying load and temperature conditions. Its sharp knee characteristics and low dynamic impedance ensure minimal output voltage drift across operating currents from 0.5 mA to 20 mA.

Designed for automotive environments, it features IATF16949-certified manufacturing, PPAP capability, and compliance with AEC-Q101 stress testing including high-temperature reverse bias, temperature cycling, and humidity bias life. The SOD323 package supports automated placement and reflow soldering per J-STD-020 Level 1 moisture sensitivity.

Key Specifications

Pinout & Package

Package: SOD323 - ultra-small surface-mount plastic case (1.30 × 1.70 × 0.90 mm), UL 94V-0 rated, matte tin-plated alloy 42 leadframe, cathode identified by band marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C9V1,115 and MMSZ5240B-TP, UDZ9V1BQ-13 delivers tighter voltage tolerance and automotive qualification in a smaller SOD323 package-critical for space-constrained, safety-compliant ECU designs where reference stability directly impacts control loop accuracy.

Availability

UDZ9V1BQ-13 is available at Aetrix Electronics and suitable for automotive engine control units, cabin sensor modules, infotainment power clamping, and ADAS camera biasing requiring stable component supply with full AEC-Q101 traceability and PPAP documentation.

Supply support for UDZ9V1BQ-13 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' automotive-qualified Zener diode product line, engineered specifically for precision voltage reference and overvoltage protection in harsh-environment vehicle electronics.

FAQ

What is the maximum reverse voltage that UDZ9V1BQ-13 can withstand before breakdown?

The UDZ9V1BQ-13 has a guaranteed Zener voltage range of 8.85–9.23 V at 5 mA test current. Breakdown begins sharply within this range; operation below 6.0 V reverse voltage yields ≤0.5 µA leakage. It is not rated for sustained reverse voltage beyond its specified V_Z range without exceeding power or thermal limits.

Is UDZ9V1BQ-13 compatible with lead-free reflow soldering processes?

Yes. UDZ9V1BQ-13 uses matte tin annealed terminals over alloy 42 leadframe and is fully RoHS 3 compliant. It meets MIL-STD-202 Method 208 solderability requirements and is qualified for standard Pb-free reflow profiles, including peak temperatures up to 260 °C per J-STD-020 Level 1.

Does UDZ9V1BQ-13 require external current-limiting resistors in typical applications?

Yes. Like all Zener diodes, UDZ9V1BQ-13 must be used with a series current-limiting resistor to set the operating Zener current (I_Z) between 0.5 mA and 20 mA. The resistor value is calculated using (V_IN − V_Z) / I_Z, ensuring power dissipation stays within 200 mW and thermal limits.

How does the SOD323 package affect thermal performance compared to larger Zener packages?

The SOD323 package gives UDZ9V1BQ-13 a junction-to-ambient thermal resistance of 625 °C/W on FR-4 PCB-higher than SOT23 (≈300 °C/W) or SOD123 (≈357 °C/W). This necessitates careful power derating above 25 °C ambient, as shown in Figure 1; at 85 °C ambient, max usable power drops to ~125 mW.