Nexperia USA Inc. BZX8450-B10R

Overview

BZX8450-B10R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and reference voltage generation at 10 V nominal with ±2 % tolerance. It delivers stable regulation at 50 μA test current, exhibits 150 Ω typical differential resistance at 5 mA, and supports ambient temperatures from −55 °C to +150 °C. Used in portable battery-powered sensor signal conditioning circuits requiring minimal quiescent current.

For engineers reviewing the BZX8450-B10R datasheet, BZX8450-B10R pinout, BZX8450-B10R application, or BZX8450-B10R equivalent, key selection criteria include its 10 V nominal Zener voltage, ±2 % tolerance, 250 mW power dissipation limit, SOT23 footprint compatibility, and low-leakage reverse characteristics optimized for low-power analog references.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining a stable 10 V output across its cathode–anode terminals when reverse-biased above its breakdown threshold. Its specified Zener voltage is measured at I_Z = 50 μA, enabling accurate low-current biasing without loading sensitive circuits.

The BZX8450-B10R belongs to the "B" tolerance series (±2 %), features a temperature coefficient of +4.5 mV/K at 10 V, and exhibits ≤ 90 pF capacitance at 0 V reverse bias and 1 MHz - critical for noise-sensitive reference nodes in ADC front-ends and oscillator bias networks.

Key Specifications

Pinout & Package

Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch), rated for reflow and wave soldering per JEDEC standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5240B and BZX84-C10, the BZX8450-B10R provides tighter ±2 % tolerance and lower leakage at the expense of reduced power headroom - making it optimal for micro-power analog references where accuracy and noise matter more than drive capability.

Availability

BZX8450-B10R is available at Aetrix Electronics and suitable for portable sensor biasing, ADC reference dividers, low-power oscillator biasing, and overvoltage clamp protection requiring stable component supply across production lifecycles.

Supply support for BZX8450-B10R 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

Nexperia is a global semiconductor expert delivering high-performance logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for consumer, industrial, and automotive markets.

The BZX8450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for ultra-low-power voltage reference and biasing in battery-constrained and noise-sensitive analog subsystems.

FAQ

What is the maximum reverse voltage this diode can withstand before breakdown?

The BZX8450-B10R has a nominal Zener voltage of 10 V, with guaranteed breakdown occurring between 9.80 V and 10.20 V at 50 μA test current. Its absolute maximum reverse voltage is not defined - instead, it operates within its specified V_Z range under controlled current. Exceeding 10.2 V without current limiting risks thermal runaway due to its 250 mW power limit.

Can this part replace BZX84-C10 in an existing design?

Yes, BZX8450-B10R is pin-compatible with BZX84-C10 in SOT23 and shares identical marking location and thermal footprint. However, it offers ±2 % tolerance versus ±5 %, lower leakage (<0.1 μA vs >1 μA), and optimized noise behavior. No layout change is needed, but verify if tighter regulation improves system accuracy without requiring bias current adjustment.

Is the n.c. pin electrically isolated or internally tied to substrate?

Pin 2 is explicitly designated "not connected" in Nexperia's official pinning diagram and internal construction. It is fully electrically isolated - no bond wire, die attachment, or metallization links it to anode, cathode, or substrate. PCB land pattern must leave this pad unconnected; routing or thermal vias to it are prohibited and may cause assembly defects.

Does this Zener diode require a series resistor in all applications?

Yes - a current-limiting resistor is mandatory to prevent thermal destruction. For example, at 12 V supply and 10 V V_Z, a 2.2 kΩ resistor delivers ~910 μA, staying within the 250 mW dissipation limit. The resistor value must be selected to ensure minimum Zener current (≥50 μA) under worst-case supply and temperature conditions while respecting P_tot derating above 25 °C.