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

Nexperia USA Inc. BZX8450-C4V3R

Name: BZX8450-C4V3R
Brand: Nexperia USA Inc.
SKU: BZX8450-C4V3R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-C4V3R

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-C4V3R.pdf

Description:: DIODE ZENER 4.3V 250MW TO236AB

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Product details

Overview

BZX8450-C4V3R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in portable electronics. It delivers 4.3 V nominal regulation at 50 µA test current, with ±5 % tolerance, 95 Ω differential resistance at 5 mA, and −2.7 mV/K temperature coefficient. Used in battery-powered sensor signal conditioning circuits where low quiescent current and stable reference are critical.

For engineers reviewing the BZX8450-C4V3R datasheet, BZX8450-C4V3R pinout, BZX8450-C4V3R application, or BZX8450-C4V3R equivalent, key selection criteria include its 4.3 V Zener voltage tolerance, 250 mW power rating, SOT23 footprint compatibility, and optimized leakage behavior for noise-sensitive analog front-ends.

Technical Context

This device operates as a reverse-biased Zener diode with specified regulation at I_Z = 50 µA - enabling ultra-low-power biasing in standby or sleep-mode circuits. Its intentional minor leakage rise (per AN90031) reduces switching transients and improves noise performance in high-impedance reference nodes.

Thermal resistance from junction to solder point is 330 K/W, and it supports ambient operation from −55 °C to +150 °C. The SOT23 package enables high-density PCB layouts while maintaining thermal integrity under 250 mW dissipation at T_amb ≤ 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	4.09 V to 4.52 V at I_Z = 50 µA - defines tight regulation window for 4.3 V nominal reference
Differential Resistance r_diff	95 Ω at I_Z = 5 mA - determines output impedance and load regulation sensitivity
Temperature Coefficient S_Z	−2.7 mV/K - quantifies voltage drift over temperature; enables predictable compensation
Forward Voltage V_F	≤ 0.9 V at I_F = 10 mA - ensures low loss when used in forward-biased protection paths
Total Power Dissipation P_tot	250 mW at T_amb ≤ 25 °C on FR4 PCB - sets maximum continuous bias current limit (~58 mA at 4.3 V)
Junction-to-Ambient R_th(j-a)	500 K/W - defines thermal derating slope for elevated ambient temperatures
Reverse Current I_R	≤ 4.0 µA at V_R = 2.0 V - confirms low leakage in sub-threshold bias applications

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 mounting.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Forward current entry; reverse-biased connection to ground or low-impedance node for Zener operation
2	Not Connected (n.c.)	Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or thermal path disruption
3	Cathode (K)	Reverse-bias terminal; connects to regulated voltage node; serves as primary thermal path to PCB copper

Key Features

Feature	Design Value
Low-test-current specification	Rated at I_Z = 50 µA - enables stable reference generation in µA-level bias networks without loading
Optimized leakage profile	Intentional minor IR rise per AN90031 - suppresses switching noise and improves transient response in high-Z references
±5 % voltage tolerance	Tighter than standard 10 % Zeners - reduces calibration overhead in factory-trimmed analog signal chains
95 Ω dynamic impedance	Measured at 5 mA - ensures <1 % output variation across 1 mA load steps in precision reference buffers
SOT23 footprint compatibility	Standard 3-pin, 1.9 mm pitch - allows drop-in replacement in space-constrained IoT sensor modules and wearables

Applications

Portable Sensor Biasing

Low-Power ADC Reference

Use Scenario: Providing stable excitation voltage to MEMS pressure sensors in battery-operated environmental monitors.

IC Role / Device Role / Timing Role: Zener voltage reference diode operating in reverse breakdown to generate fixed 4.3 V bias rail.

Use Value: Enables <±0.5 % sensor gain stability over −25 °C to +70 °C due to matched −2.7 mV/K TC and low r_diff.

Use Scenario: Supplying reference voltage to 12-bit SAR ADCs in energy-harvesting wireless nodes.

IC Role / Device Role / Timing Role: Low-noise, low-current Zener reference replacing higher-power shunt regulators.

Use Value: Reduces reference current draw by 85 % vs. 5 mA–rated Zeners, extending coin-cell life beyond 5 years.

Microcontroller Reset Circuit

ESD-Protected Signal Clamping

Use Scenario: Generating threshold voltage for RC-based power-on reset (POR) in ultra-low-power MCUs.

IC Role / Device Role / Timing Role: Precision voltage threshold element defining POR trip point during V_DD ramp-up.

Use Value: Tight 4.09–4.52 V range ensures deterministic reset assertion across supply tolerances and temperature.

Use Scenario: Clamping analog input pins of industrial IO modules exposed to transient surges.

IC Role / Device Role / Timing Role: Bidirectional protection device: forward conduction limits negative transients; Zener action clamps positive spikes.

Use Value: 0.9 V V_F and 4.3 V V_Z jointly define safe input swing window while surviving 40 W non-repetitive surges.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5225BS-7-F (Diodes Inc.)	4.3 V, ±5 %, 225 mW, r_diff = 23 Ω @ 20 mA - lower impedance but higher test current	Requires ≥20 mA bias for spec compliance; unsuitable for µA-level systems	Select only if circuit can sustain >100 µA minimum Zener current and needs tighter dynamic regulation
BZX84-C4V3 (Nexperia, legacy marking)	Identical electrical specs but older revision; lacks AN90031 leakage optimization and updated thermal data	No documented fast-switching noise reduction; may exhibit higher transient overshoot in pulsed bias	Prefer BZX8450-C4V3R for new designs requiring certified low-noise reference behavior

Compared with MMBZ5225BS-7-F, BZX8450-C4V3R trades dynamic impedance for ultra-low bias current operation; compared with legacy BZX84-C4V3, it adds verified leakage tuning for improved signal integrity in high-impedance nodes.

Availability

BZX8450-C4V3R is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC reference, and microcontroller reset circuits requiring stable component supply with guaranteed long-term traceability.

Supply support for BZX8450-C4V3R 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.

BZX8450 series belongs to Nexperia's low-current Zener regulator portfolio, engineered specifically for battery-powered and space-constrained applications demanding precision voltage references at microampere bias levels.

FAQ

What is the maximum continuous reverse current for stable regulation?

The BZX8450-C4V3R maintains regulation up to 58 mA (250 mW ÷ 4.3 V) at T_amb = 25 °C on standard FR4 PCB. Derating begins above 25 °C per R_th(j-a) = 500 K/W; at 70 °C ambient, max continuous current drops to ~35 mA to hold T_j ≤ 150 °C.

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

Per Application Note AN90031, this controlled leakage increase reduces minority-carrier storage time, minimizing turn-off transients and high-frequency noise in high-impedance reference nodes - particularly beneficial in sensor bias and ADC reference applications where signal integrity is critical.

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

Pin 2 is internally not connected and must remain unconnected on the PCB. Grounding it introduces parasitic capacitance and potential thermal path imbalance, degrading voltage stability and thermal resistance. Standard SOT23 layout guidelines require leaving n.c. terminals unbonded and un-routed.

Is this device suitable for automotive applications?

No. The BZX8450-C4V3R is not AEC-Q200 qualified and lacks automotive-grade screening, extended temperature validation, or failure mode documentation required for automotive use. Nexperia explicitly states non-automotive qualification in the legal disclaimers; use only in industrial, consumer, or portable electronics.

BZX8450-C4V3R 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):: 4.3 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 95 Ohms

Current - Reverse Leakage @ Vr:: 4 µA @ 2 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-C4V3R FAQ

1.How can I place an order for BZX8450-C4V3R through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-C4V3R 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-C4V3R reliable?

The price and inventory of BZX8450-C4V3R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C4V3R is usually 5 days.

3.What payment methods are accepted for BZX8450-C4V3R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C4V3R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-C4V3R?

BZX8450-C4V3R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-C4V3R 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-C4V3R?

For technical support, including BZX8450-C4V3R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C4V3R requirements.

6.How does Aetrix verify that BZX8450-C4V3R is sourced from the original manufacturer or authorized distributors?

All BZX8450-C4V3R 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-C4V3R meets industry standards.

7.What is the process for return or replacement of BZX8450-C4V3R?

All BZX8450-C4V3R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C4V3R, 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-C4V3R part is unused and in its original packaging.

Return procedure for BZX8450-C4V3R:

1.Submit a request within 90 days.

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

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