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

Nexperia USA Inc. BZX8450-C3V3R

Name: BZX8450-C3V3R
Brand: Nexperia USA Inc.
SKU: BZX8450-C3V3R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-C3V3R

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-C3V3R.pdf

Description:: DIODE ZENER 3.3V 250MW TO236AB

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Product details

Overview

BZX8450-C3V3R 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 a nominal 3.3 V regulation at 50 µA test current, with ±5 % tolerance, 160 Ω differential resistance at 5 mA, and 1.5 µA max reverse leakage at 2.5 V, enabling stable operation in portable battery-powered sensors and microcontroller reset circuits.

For engineers reviewing the BZX8450-C3V3R datasheet, BZX8450-C3V3R pinout, BZX8450-C3V3R application, or BZX8450-C3V3R equivalent, key selection criteria include its low 50 µA regulation test current, intentional leakage optimization for noise reduction (per AN90031), SOT23 footprint compatibility, and thermal resistance of 330 K/W to solder point - critical for space-constrained, thermally sensitive designs.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified working voltage of 3.13 V to 3.47 V at I_Z = 50 µA, exhibiting a temperature coefficient of −3.5 mV/K and diode capacitance of 160 pF at 0 V. Its differential resistance remains ≤160 Ω up to 5 mA, ensuring stable regulation under light-load transients.

The device features a non-connected (n.c.) terminal (Pin 2) to isolate cathode-anode parasitics and reduce layout-induced noise coupling. Its intentional minor rise in leakage current - unique to BZX8450-B/C11–C51 variants - improves switching speed and suppresses high-frequency noise in analog reference paths.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	3.3 V at I_Z = 50 µA - enables accurate low-bias voltage reference for 3.3 V logic domains
Voltage Tolerance	±5 % - supports cost-sensitive designs where tighter tolerance is unnecessary
Differential Resistance	≤160 Ω at I_Z = 5 mA - maintains regulation stability across small load variations
Reverse Leakage Current	≤1.5 µA at V_R = 2.5 V - minimizes quiescent power loss in battery-critical applications
Forward Voltage	≤0.9 V at I_F = 10 mA - ensures predictable anode-cathode drop during forward conduction
Total Power Dissipation	250 mW at T_amb ≤ 25 °C on FR4 PCB - defines maximum continuous thermal budget in standard layouts
Junction Temperature Limit	150 °C - sets upper boundary for reliable operation in industrial ambient conditions

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Forward current entry point; connected to lower-potential node in Zener configuration
2	Not Connected (n.c.)	Internally isolated; must remain unconnected to avoid parasitic coupling or thermal path disruption
3	Cathode (K)	Regulated output node; ties to reference rail or feedback input in shunt regulator topologies

Key Features

Feature	Design Value
Low test current regulation	Specified at 50 µA - reduces standby current draw in always-on sensor nodes
Optimized leakage profile	Intentional minor leakage rise per AN90031 - enhances transient response and lowers broadband noise
Thermal performance	R_th(j-sp) = 330 K/W to cathode solder point - enables direct thermal coupling to PCB copper for passive cooling
Small-footprint packaging	SOT23 with 1.9 mm pitch - fits high-density layouts without requiring via-in-pad or complex routing
Two tolerance options	±2 % (B-series) and ±5 % (C-series) - allows cost/performance trade-off selection per application need

Applications

Microcontroller Reset Circuit

Portable Sensor Bias Reference

Use Scenario: Provides clean, stable 3.3 V reference to reset ICs in battery-powered IoT edge nodes operating at <10 µA sleep current.

IC Role / Device Role / Timing Role: Shunt Zener regulator supplying precise threshold voltage to supervisor IC's sense input.

Use Value: Low 50 µA test current and 1.5 µA leakage ensure minimal impact on battery life while maintaining reset accuracy within ±5 % over temperature.

Use Scenario: Supplies regulated bias to MEMS accelerometer analog front-end in wearable health monitors.

IC Role / Device Role / Timing Role: Voltage reference element stabilizing op-amp supply rails and ADC reference inputs.

Use Value: 160 pF capacitance and −3.5 mV/K tempco minimize signal drift and noise injection into low-level sensor signals.

USB-C Power Negotiation Interface

Industrial PLC Analog Input Protection

Use Scenario: Clamps and regulates auxiliary 3.3 V rail used by USB PD controller firmware during negotiation sequences.

IC Role / Device Role / Timing Role: Low-power shunt regulator maintaining stable VDD for PD policy engine during dynamic voltage transitions.

Use Value: 250 mW power rating and SOT23 thermal resistance support short-duration 100 mA peak loads without thermal runaway.

Use Scenario: Protects 4–20 mA loop receiver inputs against overvoltage transients while providing stable 3.3 V reference for ADC calibration.

IC Role / Device Role / Timing Role: Dual-role component acting as both clamp and precision reference in isolated analog input stage.

Use Value: Non-connected Pin 2 eliminates ground-loop coupling, and 150 °C junction rating ensures reliability in 85 °C cabinet environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5226BS-7-F (Diodes Inc.)	3.3 V ±5 %, 200 mW rating, 100 Ω r_diff at 20 mA, no n.c. pin	Higher test current (20 mA) increases quiescent power; lacks intentional leakage optimization	Prefer when higher current drive capability is needed and noise sensitivity is low
BZX84-C3V3 (Nexperia legacy)	Same 3.3 V ±5 % spec but older revision; no AN90031 leakage tuning; R_th(j-a) = 500 K/W vs. 330 K/W	Higher thermal resistance limits power handling in compact layouts; no fast-switching noise benefit	Acceptable only for non-noise-critical, low-density boards with ample copper area

Compared with MMBZ5226BS-7-F, BZX8450-C3V3R offers superior low-current regulation fidelity and lower thermal resistance, while versus legacy BZX84-C3V3 it delivers measurable noise reduction and improved thermal coupling - making it optimal for modern ultra-low-power, high-integration designs.

Availability

BZX8450-C3V3R is available at Aetrix Electronics and suitable for microcontroller reset circuits, portable sensor bias references, USB-C power negotiation interfaces, and industrial PLC analog input protection requiring stable component supply across production lifecycles.

Supply support for BZX8450-C3V3R 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 for automotive, industrial, and consumer markets.

The BZX8450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-constrained, noise-sensitive applications where regulation at microampere bias currents and optimized thermal/noise behavior are mandatory.

FAQ

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

The BZX8450-C3V3R has a nominal Zener voltage of 3.3 V, with guaranteed breakdown occurring between 3.13 V and 3.47 V at 50 µA test current. Its absolute maximum reverse voltage is not rated separately - operation above 3.47 V under regulation conditions is normal and expected, but sustained voltage beyond the 200 mA forward current limit or 40 W non-repetitive surge may cause failure.

Can Pin 2 be grounded or left floating in PCB layout?

Pin 2 is explicitly marked "not connected" (n.c.) in the datasheet and must remain unconnected - neither grounded nor tied to any net. Connecting it risks introducing parasitic capacitance, compromising noise performance, or disrupting the internal die isolation that enables the optimized leakage profile described in AN90031.

How does the "intentional minor rise of leakage current" improve performance?

Per Application Note AN90031, this controlled leakage increase in BZX8450-B/C11–C51 variants reduces minority-carrier lifetime, accelerating turn-off response and lowering high-frequency impedance. This directly suppresses broadband noise in reference paths and improves transient recovery in shunt regulator configurations.

Is this device suitable for automotive applications?

No - the BZX8450-C3V3R is not AEC-Q200 qualified and is explicitly designated as non-automotive in Nexperia's legal disclaimers. It lacks automotive-grade screening, extended temperature validation (−40 °C to +125 °C), and fault-mode testing required for vehicle systems. Use only in commercial or industrial environments up to +85 °C ambient.

BZX8450-C3V3R 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):: 3.3 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 7.5 µA @ 1.5 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-C3V3R FAQ

1.How can I place an order for BZX8450-C3V3R through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-C3V3R 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-C3V3R reliable?

The price and inventory of BZX8450-C3V3R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C3V3R is usually 5 days.

3.What payment methods are accepted for BZX8450-C3V3R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C3V3R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-C3V3R?

BZX8450-C3V3R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-C3V3R 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-C3V3R?

For technical support, including BZX8450-C3V3R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C3V3R requirements.

6.How does Aetrix verify that BZX8450-C3V3R is sourced from the original manufacturer or authorized distributors?

All BZX8450-C3V3R 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-C3V3R meets industry standards.

7.What is the process for return or replacement of BZX8450-C3V3R?

All BZX8450-C3V3R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C3V3R, 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-C3V3R part is unused and in its original packaging.

Return procedure for BZX8450-C3V3R:

1.Submit a request within 90 days.

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

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