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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. BZX8450-C1V8R

Name: BZX8450-C1V8R
Brand: Nexperia USA Inc.
SKU: BZX8450-C1V8R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-C1V8R

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BZX8450-C1V8R.pdf

Description:: DIODE ZENER 1.8V 250MW TO236AB

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Inventory:40,056

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Product details

Overview

BZX8450-C1V8R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers 1.8 V nominal regulation at 50 µA test current, with ±5 % tolerance, 600 Ω dynamic resistance at 50 µA, and 220 pF capacitance at 0 V - enabling stable operation in portable battery-powered sensor nodes and microcontroller reset circuits.

For engineers reviewing the BZX8450-C1V8R datasheet, BZX8450-C1V8R pinout, BZX8450-C1V8R application, or BZX8450-C1V8R equivalent, this page provides verified electrical parameters, terminal mapping, thermal behavior, and direct substitution guidance for low-current Zener-based reference design.

Technical Context

This device operates as a reverse-biased Zener diode with a specified breakdown voltage of 1.71 V to 1.89 V at I_Z = 50 µA. Its differential resistance remains ≤600 Ω at low current, and temperature coefficient is −3.5 mV/K - indicating predictable negative drift over temperature for analog reference stability.

The SOT23-3 package features Pin 1 (anode), Pin 2 (not connected), and Pin 3 (cathode), with thermal resistance R_th(j-a) = 500 K/W in free air and R_th(j-sp) = 330 K/W to cathode solder point - critical for thermal management in densely populated PCBs.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	1.8 V (1.71–1.89 V range at 50 µA) - sets precise low-voltage reference for MCU brown-out detection
Tolerance	±5 % - enables cost-effective selection for non-critical biasing where tight regulation is secondary to ultra-low leakage
Test Current	50 µA - allows operation directly from high-impedance sources like microcontroller GPIO pull-ups or RC timing networks
Differential Resistance	≤600 Ω at 50 µA - ensures minimal voltage shift under small load variations in signal conditioning paths
Capacitance	220 pF at 0 V - limits high-frequency noise coupling in analog front-end references
Forward Voltage	≤0.9 V at 10 mA - supports bidirectional clamping when used with series resistor in protection circuits
Power Dissipation	250 mW at T_amb ≤ 25 °C - defines maximum continuous DC power handling on standard FR4 PCB

Pinout & Package

SOT23-3 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch) with molded epoxy case and tin-plated terminations.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	Connects to lower-potential node in reverse-bias configuration; must be held at voltage ≤ V_Z − 0.9 V during forward conduction
2	Not Connected	Floating terminal - no internal bond wire; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress
3	Cathode	Primary connection point for regulated output; ties to system ground or reference rail; serves as thermal path to PCB copper

Key Features

Feature	Design Value
Low test current operation	Specified at 50 µA - eliminates need for dedicated bias current source in energy-harvesting or coin-cell designs
Optimized leakage profile	Intentional minor rise in IR for BZX8450-C variants - reduces switching transients and improves noise immunity in ADC reference buffers
Thermal performance	R_th(j-sp) = 330 K/W - enables reliable operation up to 125 °C ambient when cathode pad is thermally anchored
Package compatibility	SOT23 footprint - shares land pattern with common logic and analog SMD devices, simplifying layout reuse and assembly

Applications

Microcontroller Reset Circuit

Low-Power Sensor Biasing

Use Scenario: Generating a stable 1.8 V threshold for brown-out detection in ARM Cortex-M0+ MCUs powered by single-cell Li-ion.

IC Role / Device Role / Timing Role: Zener reference element defining reset assertion voltage; placed between VDD and RESET pin with pull-down resistor.

Use Value: Enables deterministic reset at 1.71–1.89 V without external regulator IC, reducing BOM count and quiescent current by >10 µA.

Use Scenario: Providing bias voltage to MEMS accelerometer analog output stage in wearable health monitor operating from 2.0 V coin cell.

IC Role / Device Role / Timing Role: Low-current voltage reference for op-amp input offset nulling and ADC reference divider network.

Use Value: Delivers 220 pF capacitance and <1 µA leakage at 1.5 V reverse bias - minimizing signal path loading and preserving battery life beyond 12 months.

RF Front-End Protection

Portable Audio Signal Clamping

Use Scenario: ESD and transient suppression on 50 Ω RF input line of Bluetooth LE receiver IC operating near 2.4 GHz.

IC Role / Device Role / Timing Role: Low-capacitance shunt clamp; anode grounded, cathode tied to RF trace via 0 Ω series resistor.

Use Value: 220 pF capacitance avoids resonance shift below 3 GHz; 250 mW rating handles IEC 61000-4-2 contact discharge peaks without degradation.

Use Scenario: DC level shifting and overvoltage limiting in headphone amplifier output stage driven by 3.3 V SoC DAC.

IC Role / Device Role / Timing Role: Bidirectional clamp; configured anode-to-rail and cathode-to-signal to limit swing between 0 V and 1.8 V.

Use Value: Forward voltage ≤0.9 V at 10 mA prevents audible distortion during clipping; SOT23 size fits within 2 mm² audio subsystem area budget.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBZ5221BS	1.8 V, ±5 %, 500 mW rating, 1000 Ω r_diff at 20 µA - higher power but looser low-current regulation	Requires ≥20 µA bias; less suitable for sub-µA sleep-mode references	Prefer when board space allows larger SOT-23-3 variant and higher surge margin is needed
Vishay BZX84-C1V8	Identical 1.8 V/±5 % spec, but rated at 350 mW and 300 Ω r_diff at 5 mA - optimized for higher-current use cases	Leakage rises faster above 2 V reverse bias - degrades accuracy in ultra-low-I_Q systems	Choose only if existing design uses Vishay footprint and thermal margin exceeds 250 mW requirement

Compared with MMBZ5221BS and BZX84-C1V8, the BZX8450-C1V8R offers tighter low-current regulation (600 Ω @ 50 µA vs. 1000 Ω @ 20 µA and 300 Ω @ 5 mA), lower capacitance (220 pF vs. 350 pF and 250 pF), and guaranteed SOT23-3 pinout compliance - making it optimal for battery-constrained, noise-sensitive analog reference nodes.

Availability

BZX8450-C1V8R is available at Aetrix Electronics and suitable for microcontroller reset circuits, low-power sensor biasing, RF front-end protection, and portable audio signal clamping requiring stable component supply across production lifecycles.

Supply support for BZX8450-C1V8R 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 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and energy-efficient applications where minimal bias current, predictable temperature drift, and compact packaging are mandatory.

FAQ

What is the maximum reverse voltage before breakdown for BZX8450-C1V8R?

The device exhibits sharp Zener breakdown between 1.71 V and 1.89 V at I_Z = 50 µA. Below 1.71 V, reverse current remains ≤1.0 µA at 25 °C; sustained reverse bias above 1.89 V increases current exponentially per Figure 5. Absolute maximum reverse voltage is not defined - operation must stay within the specified V_Z window for regulation.

Can BZX8450-C1V8R be used in forward conduction mode?

Yes - its forward voltage is ≤0.9 V at 10 mA (pulse-tested), making it usable as a low-drop clamp or level shifter. However, forward operation lacks regulation characteristics; it should only be applied where voltage drop predictability matters more than precision, such as in simple overvoltage limiting paths.

How does the "C" suffix affect performance versus "B" variants?

The "C" suffix denotes ±5 % tolerance and intentional minor leakage current increase (per AN90031), which reduces switching noise and improves transient response in reference buffers. "B" variants offer ±2 % tolerance but lower leakage - "C" is preferred for noise-sensitive analog rails; "B" suits tighter voltage thresholds where leakage is secondary.

Is Pin 2 internally connected or safe to tie to ground?

Pin 2 is explicitly marked "n.c." (not connected) in Table 2 and has no internal bond wire. It must remain unconnected on the PCB - grounding or routing to any net introduces risk of mechanical stress fracture, solder wicking, or unintended capacitive coupling to adjacent traces.

BZX8450-C1V8R Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 1.8 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 7.5 µA @ 1 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BZX8450-C1V8R FAQ

1.How can I place an order for BZX8450-C1V8R through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-C1V8R on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BZX8450-C1V8R reliable?

The price and inventory of BZX8450-C1V8R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C1V8R is usually 5 days.

3.What payment methods are accepted for BZX8450-C1V8R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C1V8R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-C1V8R?

BZX8450-C1V8R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-C1V8R order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BZX8450-C1V8R?

For technical support, including BZX8450-C1V8R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C1V8R requirements.

6.How does Aetrix verify that BZX8450-C1V8R is sourced from the original manufacturer or authorized distributors?

All BZX8450-C1V8R products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZX8450-C1V8R meets industry standards.

7.What is the process for return or replacement of BZX8450-C1V8R?

All BZX8450-C1V8R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C1V8R, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BZX8450-C1V8R part is unused and in its original packaging.

Return procedure for BZX8450-C1V8R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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