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

Nexperia USA Inc. BZX8450-B4V3-QR

Name: BZX8450-B4V3-QR
Brand: Nexperia USA Inc.
SKU: BZX8450-B4V3-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-B4V3-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-B4V3-QR.pdf

Description:: DIODE ZENER 4.3V 250MW TO236AB

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Inventory:5,762

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Product details

Overview

BZX8450-B4V3-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in battery-powered systems. It delivers 4.3 V nominal regulation at 50 µA test current, with ±2 % tolerance, 95 Ω differential resistance at 5 mA, and −2.7 mV/K temperature coefficient.

For engineers reviewing the BZX8450-B4V3-QR datasheet, BZX8450-B4V3-QR pinout, BZX8450-B4V3-QR application, or BZX8450-B4V3-QR equivalent, this page provides verified electrical characteristics, automotive-qualified thermal behavior, SOT23 terminal mapping, and real-world use cases in low-power sensing and microcontroller reset circuits.

Technical Context

This device operates as a reverse-biased Zener diode with specified breakdown at 4.3 V (min 4.21 V, max 4.39 V) under 50 µA test current. Its low 50 µA regulation point enables ultra-low standby current design, while intentional leakage optimization supports fast transient response in noise-sensitive analog rails.

The −2.7 mV/K temperature coefficient ensures stable reference performance across −55 °C to +150 °C ambient range, and its 250 mW total power dissipation rating is validated on FR4 PCB with single-sided 70 μm copper. AEC-Q101 qualification confirms suitability for automotive body electronics and infotainment power management.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	4.3 V (min 4.21 V, max 4.39 V at I_Z = 50 µA); defines precise DC reference level for low-bias circuits
Tolerance	±2 % (B-series); enables tight voltage margin control in 3.3 V and 5 V system monitoring paths
Differential Resistance	95 Ω (max at I_Z = 5 mA); determines output impedance and load regulation error under dynamic current draw
Temperature Coefficient	−2.7 mV/K; ensures <±15 mV drift over −40 °C to +125 °C junction range, critical for sensor signal conditioning
Forward Voltage	0.9 V (max at I_F = 10 mA); defines anode-cathode drop during forward conduction in protection or clamping roles
Total Power Dissipation	250 mW (at T_amb ≤ 25 °C on FR4 PCB); sets maximum continuous power handling without heatsinking
Junction Temperature Limit	150 °C; defines absolute thermal ceiling for reliability in engine bay or under-hood automotive modules

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), optimized for automated placement and reflow soldering on standard FR4 PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1 (Anode)	Anode connection	Connected to lower-potential node in reverse-bias configuration; must be routed with low-impedance path to ground or reference rail
2 (n.c.)	No connection	Internally unconnected; PCB pad may be omitted or left floating-no electrical function or thermal role
3 (Cathode)	Cathode connection	Connected to higher-potential node (e.g., supply rail); serves as primary heat transfer path to PCB copper pour

Key Features

Feature	Design Value
Low test current operation	Specified at 50 µA - enables micropower bias networks in coin-cell or energy-harvesting systems
Automotive qualification	AEC-Q101 qualified - guarantees reliability for under-hood, ADAS, and infotainment power supervision
Optimized leakage profile	Intentional minor leakage rise - improves switching speed and reduces high-frequency noise in feedback loops
Thermal resistance	R_th(j-sp) = 330 K/W (to cathode solder point) - supports thermal design with minimal copper area in space-constrained layouts
Stable temperature coefficient	−2.7 mV/K - minimizes reference drift in wide-temperature industrial sensors and automotive ECUs

Applications

Microcontroller Reset Circuit

Portable Sensor Biasing

Use Scenario: Generating a clean, temperature-stable reset threshold for ARM Cortex-M0+ MCUs in battery-operated IoT nodes.

IC Role / Device Role / Timing Role: Zener reference element in RC-based reset generator, setting V_REF for comparator input.

Use Value: ±2 % tolerance and −2.7 mV/K TC ensure reset assertion remains within 3.0–3.2 V across −25 °C to +70 °C, preventing spurious resets.

Use Scenario: Providing stable excitation voltage for MEMS pressure transducers in wearable health monitors.

IC Role / Device Role / Timing Role: Low-current voltage reference source powering bridge sensor circuitry.

Use Value: 50 µA test current enables direct connection to ultra-low-quiescent LDO outputs, reducing total system standby current to <1.5 µA.

Automotive Body Control Module

Industrial Signal Conditioning

Use Scenario: Monitoring 12 V battery rail integrity in door module ECUs with integrated LIN transceivers.

IC Role / Device Role / Timing Role: Overvoltage clamp and reference element in supply supervisor IC input stage.

Use Value: AEC-Q101 qualification and 150 °C junction rating allow direct placement near power FETs, eliminating external thermal derating.

Use Scenario: Stabilizing reference voltage for 16-bit SAR ADCs in programmable logic controller (PLC) analog input cards.

IC Role / Device Role / Timing Role: Precision shunt reference replacing bulkier TL431-based solutions in isolated front-end stages.

Use Value: 95 Ω differential resistance limits reference error to <0.5 LSB under 100 µA load variation, meeting EN 61000-4-5 surge immunity requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBZ5225BS	4.3 V, ±5 % tolerance, 100 Ω r_diff, no AEC-Q101 qualification	General-purpose industrial use only; not rated for automotive temperature cycling or humidity testing	Select when cost sensitivity outweighs automotive compliance and tighter tolerance is unnecessary
Vishay BZX84-C4V3	4.3 V, ±5 % tolerance, 90 Ω r_diff, AEC-Q101 qualified but higher leakage at 25 °C	Acceptable for automotive use but exhibits 2× higher IR at VR = 1 V, increasing quiescent error in low-bias designs	Prefer where thermal robustness is critical but sub-µA standby current is not required

Compared with MMBZ5225BS and BZX84-C4V3, BZX8450-B4V3-QR uniquely combines ±2 % tolerance, AEC-Q101 qualification, and 50 µA regulation current-making it the only option suitable for automotive-grade, micropower reference applications demanding both precision and reliability.

Availability

BZX8450-B4V3-QR is available at Aetrix Electronics and suitable for automotive body electronics, portable medical sensors, and industrial PLC analog front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BZX8450-B4V3-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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and automotive-grade quality.

This device belongs to the BZX8450-Q series of low-current Zener regulators, engineered specifically for AEC-Q101-compliant voltage reference and biasing in space- and power-constrained automotive and portable electronics.

FAQ

What is the maximum reverse current at 4.0 V for BZX8450-B4V3-QR?

At 4.0 V reverse bias and T_j = 25 °C, the typical reverse current is <0.1 µA, with a maximum of 0.8 µA per Table 8. This ultra-low leakage ensures minimal loading on high-impedance bias networks and preserves battery life in always-on sensor nodes.

Can BZX8450-B4V3-QR replace BZX84-C4V3 in existing designs?

Yes, with caveats: both are SOT23 Zeners at 4.3 V, but BZX8450-B4V3-QR offers ±2 % tolerance versus ±5 %, −2.7 mV/K TC versus −2.0 mV/K, and guaranteed AEC-Q101 compliance. Layout and thermal design remain identical, but system-level tolerance analysis must be updated for tighter voltage margins.

Is pin 2 truly unconnected, or does it serve a mechanical/thermal function?

Pin 2 is electrically unconnected (n.c.) per Table 2 and internal die construction. It has no electrical, thermal, or mechanical function-PCB footprint may omit this pad entirely without affecting performance, reliability, or solder joint integrity.

What is the non-repetitive peak reverse power dissipation capability?

At T_j = 25 °C prior to surge, BZX8450-B4V3-QR supports up to 40 W for 100 µs square-wave pulses (Table 5). This enables robust transient suppression in LIN bus interfaces and CAN node power rails without external TVS diodes.

BZX8450-B4V3-QR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZX8450-Q

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:: ±2%

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:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BZX8450-B4V3-QR FAQ

1.How can I place an order for BZX8450-B4V3-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-B4V3-QR 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-B4V3-QR reliable?

The price and inventory of BZX8450-B4V3-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B4V3-QR is usually 5 days.

3.What payment methods are accepted for BZX8450-B4V3-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B4V3-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-B4V3-QR?

BZX8450-B4V3-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-B4V3-QR 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-B4V3-QR?

For technical support, including BZX8450-B4V3-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B4V3-QR requirements.

6.How does Aetrix verify that BZX8450-B4V3-QR is sourced from the original manufacturer or authorized distributors?

All BZX8450-B4V3-QR 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-B4V3-QR meets industry standards.

7.What is the process for return or replacement of BZX8450-B4V3-QR?

All BZX8450-B4V3-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B4V3-QR, 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-B4V3-QR part is unused and in its original packaging.

Return procedure for BZX8450-B4V3-QR:

1.Submit a request within 90 days.

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

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