Nexperia USA Inc. BZX8450-B6V8-QR

Overview

BZX8450-B6V8-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in low-power circuits. It delivers a nominal 6.8 V regulation at 50 µA test current, with ±2 % tolerance, 80 Ω differential resistance at 5 mA, and 1.2 mV/K temperature coefficient - enabling stable operation in automotive sensor interfaces and portable battery-powered systems.

For engineers reviewing the BZX8450-B6V8-QR datasheet, BZX8450-B6V8-QR pinout, BZX8450-B6V8-QR application, or BZX8450-B6V8-QR equivalent, this page provides verified electrical characteristics, AEC-Q101 qualification status, thermal resistance data (R_th(j-a) = 500 K/W), and real-world use cases in ECU voltage monitoring and IoT node power rails.

Technical Context

This Zener diode operates in reverse breakdown mode with specified regulation at low test current (50 µA), minimizing quiescent power draw. Its B-series grading ensures tight ±2 % tolerance across the 6.66 V to 6.94 V range at I_Z = 50 µA, and it exhibits a positive temperature coefficient of +1.2 mV/K - supporting predictable drift compensation in temperature-sensitive references.

The device features intentional low leakage (≤0.1 µA at V_R = 5.1 V) and low junction capacitance (100 pF at V_R = 0 V, f = 1 MHz), making it suitable for noise-sensitive analog front-ends. Its SOT23 package supports reflow and wave soldering per IPC-7095 guidelines, with defined thermal resistance to solder point (R_th(j-sp) = 330 K/W).

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), rated for −55 °C to +150 °C ambient operation and qualified to AEC-Q101 for automotive reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX8450-B6V8-QR, the BZX84-C6V8-Q trades precision and leakage performance for cost, while MMSZ5234B-7-F offers higher power handling in a larger package but lacks automotive qualification and low-current optimization.

Availability

BZX8450-B6V8-QR is available at Aetrix Electronics and suitable for automotive ECU design, portable medical instrumentation, industrial PLC analog input stages, and smart home wireless node power supervision requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BZX8450-B6V8-QR 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 focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current voltage reference and regulation in space-constrained, thermally demanding automotive and portable electronics applications.

FAQ

What is the maximum reverse voltage this Zener can regulate without damage?

The BZX8450-B6V8-QR has a nominal Zener voltage of 6.8 V and is rated for continuous operation up to its specified limiting values. Its absolute maximum reverse voltage is not defined independently - instead, it is protected by the 250 mW total power dissipation limit at T_amb ≤ 25 °C. Exceeding 6.94 V (max V_Z) under sustained current will cause thermal runaway if power dissipation exceeds ratings. Non-repetitive peak reverse power is 40 W for 100 µs pulses.

Does this part require a series resistor in typical regulator applications?

Yes - a current-limiting resistor is mandatory to set the Zener operating current between 50 µA and 5 mA. For example, with a 12 V supply and target I_Z = 1 mA, a 5.2 kΩ resistor establishes proper bias. The resistor value must be calculated using (V_IN − V_Z) / I_Z, accounting for worst-case V_Z tolerance and supply variation to avoid exceeding 250 mW dissipation or falling below minimum regulation current.

Is Pin 2 electrically connected internally?

No - Pin 2 is explicitly designated "n.c." (not connected) in the official Nexperia datasheet. It corresponds to an internal die pad with no bond wire or metallurgical connection. PCB layout must leave this terminal unconnected; routing traces or applying solder paste to Pin 2 may cause mechanical stress or unintended thermal coupling, degrading long-term reliability.

How does the +1.2 mV/K temperature coefficient affect circuit accuracy over temperature?

The +1.2 mV/K coefficient means V_Z increases by 1.2 mV per degree Celsius rise. Over a −40 °C to +125 °C range (165 K delta), this contributes +198 mV drift - approximately +2.9 % of 6.8 V. Combined with ±2 % initial tolerance, total variation reaches ±4.9 %, which remains within specification for most automotive sensor references. Designers should include this drift in total error budgeting for precision ADC scaling.