Nexperia USA Inc. BZX8450-C1V8VL

Overview

BZX8450-C1V8VL from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and biasing in ultra-low-power circuits. It delivers a nominal 1.8 V regulation at 50 µA test current, with ±5 % tolerance, 0.9 V forward voltage at 10 mA, and 250 mW total power dissipation - optimized for portable battery-powered systems requiring stable low-current regulation.

For engineers reviewing the BZX8450-C1V8VL datasheet, BZX8450-C1V8VL pinout, BZX8450-C1V8VL application, or BZX8450-C1V8VL equivalent, key selection criteria include its 1.8 V Zener voltage tolerance, intentional leakage optimization for noise reduction, SOT23 anode–n.c.–cathode pinning, and suitability for low-bias analog sensing and microcontroller reset supervision.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining stable reverse breakdown at 1.8 V under 50 µA test current. Its differential resistance is ≤600 Ω at I_Z = 50 µA and ≤100 Ω at I_Z = 1 mA, supporting tight regulation in low-current feedback paths.

The cathode–anode configuration features a non-connected (n.c.) terminal (Pin 2), enabling simplified PCB layout and thermal isolation of the cathode tab. Its temperature coefficient is −3.5 mV/K, ensuring predictable drift over −55 °C to +150 °C ambient range.

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, single-sided copper FR4 mounting.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-current Zener regulation applications.

Compared with BZX84-C1V8, BZX8450-C1V8VL offers improved noise behavior and tighter thermal coupling via cathode-tab mounting; versus MMSZ4678, it trades power headroom for 30 % smaller area and superior low-current regulation fidelity.

Availability

BZX8450-C1V8VL is available at Aetrix Electronics and suitable for microcontroller reset supervision, low-power sensor biasing, portable audio amplifier bias, and IoT node power-rail clamping requiring stable component supply across production lifecycles.

Supply support for BZX8450-C1V8VL 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 high-volume, high-reliability essential semiconductors - delivering discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

The BZX8450 series belongs to Nexperia's low-current Zener regulator product line, engineered specifically for battery-constrained and noise-sensitive applications where regulation at microamp-level currents is critical.

FAQ

What is the maximum continuous reverse current this diode can regulate at 1.8 V?

The BZX8450-C1V8VL is rated for continuous operation up to 200 mA forward current, but its Zener regulation is specified at test currents from 50 µA to 5 mA. At 1.8 V, sustained regulation above 5 mA requires thermal derating - maximum DC Zener current is limited by P_tot = 250 mW, yielding ~139 mA absolute ceiling at 1.8 V, though datasheet characterization focuses on ≤5 mA for stability and low-noise performance.

Can Pin 2 (n.c.) be grounded or left floating on the PCB?

Pin 2 is internally unconnected and must remain electrically isolated - neither grounded nor tied to any net. The datasheet explicitly states "not connected", and soldering or routing to this pin risks mechanical stress or unintended parasitic coupling. Standard SOT23 footprints allocate this pad as a thermal relief void; no copper should contact it.

How does the −3.5 mV/K temperature coefficient affect accuracy over −40 °C to +85 °C?

Over −40 °C to +85 °C, the Zener voltage shifts by −3.5 mV per Kelvin, resulting in a total drift of −437.5 mV. Applied to the 1.8 V nominal value, this yields a worst-case V_Z change of −24.3 % - however, actual drift is bounded by the min/max spec (1.71 V to 1.89 V) and remains within ±5 % tolerance band across the full industrial temperature range per datasheet Table 8.

Is this device suitable for ESD protection on a 1.8 V USB interface line?

No - the BZX8450-C1V8VL is not rated for ESD protection. Its 40 W non-repetitive peak power rating applies only to short-duration surges (tp = 100 µs), not human-body-model (HBM) or IEC 61000-4-2 events. For 1.8 V USB I/O clamping, purpose-built TVS diodes like PESD1CAN or ESD5V3U1U are required; this part serves only as a precision low-current voltage reference or regulator.