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

Nexperia USA Inc. BZX8450-C4V3-QR

Name: BZX8450-C4V3-QR
Brand: Nexperia USA Inc.
SKU: BZX8450-C4V3-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-C4V3-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-C4V3-QR.pdf

Description:: DIODE ZENER 4.3V 250MW TO236AB

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Product details

Overview

BZX8450-C4V3-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, rated for 4.3 V nominal regulation at 50 µA test current, with ±5 % tolerance, 250 mW total power dissipation, and AEC-Q101 qualification for automotive bias and reference applications.

For engineers reviewing the BZX8450-C4V3-QR datasheet, BZX8450-C4V3-QR pinout, BZX8450-C4V3-QR application, or BZX8450-C4V3-QR equivalent, this device serves as a precision low-power voltage reference in battery-powered sensor interfaces, ECU voltage monitoring circuits, and portable microcontroller reset supervision where stable low-current regulation is required.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified working voltage of 4.09 V to 4.52 V at I_Z = 50 µA, exhibiting a temperature coefficient of −2.7 mV/K and differential resistance ≤95 Ω at I_Z = 5 mA. Its low 50 µA test current enables ultra-low quiescent current operation.

Designed for automotive-grade reliability, it features intentional minor leakage current optimization per AN90031 for fast switching and noise reduction, and meets AEC-Q101 stress test requirements including T_j up to 150 °C and storage temperature from −65 °C to +150 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	4.3 V (min 4.09 V, max 4.52 V at I_Z = 50 µA) - defines precise low-current regulation point for reference and biasing
Tolerance	±5 % - tighter than standard Zeners for improved system-level voltage accuracy in cost-sensitive designs
Power Dissipation	250 mW at T_amb ≤ 25 °C on FR4 PCB - supports continuous operation in compact SMT layouts without forced cooling
Test Current	50 µA - enables use in µA-level bias networks for battery longevity in portable and automotive modules
Differential Resistance	≤95 Ω at I_Z = 5 mA - ensures stable regulation under small load variations in feedback and reference paths
Forward Voltage	≤0.9 V at I_F = 10 mA - allows safe forward conduction during transient conditions or polarity protection
Junction Temperature	−55 °C to +150 °C - validated for under-hood automotive environments and industrial edge nodes

Pinout & Package

Package: SOT23 plastic surface-mounted package, 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, 3-terminal configuration.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connects to lower-potential side in reverse-bias regulation; must be held at voltage ≤ V_Z − 0.9 V to avoid forward conduction
2	Not Connected (n.c.)	Internally unconnected terminal - must remain floating; no PCB trace or solder mask should tie it to any net
3	Cathode (K)	Connects to higher-potential side in regulation; carries reverse current during Zener operation and defines voltage reference node

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive electronics per discrete semiconductor stress test standard - eliminates need for customer requalification
Low 50 µA test current	Enables direct integration into µA-scale bias chains for ultra-low-power MCUs and sensors without additional current amplification
Optimized leakage profile	Intentional minor rise in leakage per AN90031 improves switching speed and reduces noise in dynamic reference applications
SOT23 footprint compatibility	Standard 3-pin SOT23 land pattern (per Fig. 10) supports automated assembly and high-density PCB routing
Thermal resistance	R_th(j-a) = 500 K/W (free air), R_th(j-sp) = 330 K/W - enables thermal-aware layout with minimal copper area for cost-sensitive boards

Applications

Automotive ECU Voltage Monitoring

Portable Sensor Bias Reference

Use Scenario: Real-time monitoring of 5 V supply rail in engine control unit to trigger fault logging if voltage deviates beyond ±5 %.

IC Role / Device Role / Timing Role: Zener reference element providing stable 4.3 V threshold for comparator input in analog monitoring circuit.

Use Value: ±5 % tolerance and −2.7 mV/K tempco ensure <±1.5 % total error over −40 °C to +125 °C, meeting ASIL-B diagnostic coverage requirements.

Use Scenario: Providing regulated bias voltage to MEMS pressure sensor in wireless tire pressure monitoring system (TPMS).

IC Role / Device Role / Timing Role: Low-current Zener shunt regulator establishing reference for sensor excitation and ADC input scaling.

Use Value: 50 µA test current draws <1 µA standby current when paired with high-impedance op-amp buffer, extending coin-cell battery life to >5 years.

Microcontroller Reset Supervision

Industrial IO-Link Interface Reference

Use Scenario: Generating reliable reset signal for ARM Cortex-M0+ MCU during cold start and brown-out events in telematics module.

IC Role / Device Role / Timing Role: Zener-based voltage detector feeding RC delay network to reset controller's nRESET pin.

Use Value: Stable 4.3 V breakdown with <95 Ω r_diff ensures consistent trip point across production lots and temperature, eliminating false resets.

Use Scenario: Supplying precision reference for 24 V IO-Link master PHY voltage translator in factory automation gateway.

IC Role / Device Role / Timing Role: Shunt regulator stabilizing internal 5 V LDO feedback node against ripple and transients on 24 V bus.

Use Value: AEC-Q101 qualification and 150 °C T_j rating allow placement near hot-running IO-Link drivers without derating or thermal shielding.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C4V3,115 (Nexperia)	Same 4.3 V/±5 % spec but non-AEC-Q101; 350 mW P_tot; no optimized leakage profile	Approved only for commercial/industrial use; not suitable for automotive under-hood deployment	Select when AEC-Q101 is unnecessary and higher power margin is needed for transient suppression
MMSZ4V3T1G (ON Semiconductor)	4.3 V/±5 %, SOD-123 package, 500 mW P_tot, 1000 ppm/°C tempco (−3.5 mV/K), no AEC-Q101	Larger footprint; higher tempco increases drift over temperature; lacks automotive qualification	Choose for legacy SOD-123 board reuse or where higher surge power handling is prioritized over size and temp stability

Compared with BZX8450-C4V3-QR, the BZX84-C4V3 offers higher power headroom but lacks automotive qualification and leakage optimization, while MMSZ4V3T1G trades smaller SOT23 size and superior tempco for larger package and no AEC-Q101 compliance-making BZX8450-C4V3-QR the only option meeting all three: miniaturization, automotive grade, and low-drift regulation.

Availability

BZX8450-C4V3-QR is available at Aetrix Electronics and suitable for automotive ECU monitoring, portable sensor biasing, and microcontroller reset supervision requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BZX8450-C4V3-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 focused on essential efficiency technologies, delivering high-performance, high-reliability discrete and logic devices for automotive, industrial, and consumer markets.

The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, high-stability voltage reference and regulation in automotive electronics and battery-constrained systems.

FAQ

What is the maximum reverse current at 4.3 V before breakdown?

At 4.3 V reverse bias and T_j = 25 °C, the typical reverse current is ≤4.0 µA (per Table 8). This value remains below 5 µA across the full operating temperature range, ensuring minimal leakage in high-impedance reference nodes without compromising regulation accuracy.

Can BZX8450-C4V3-QR replace BZX84-C4V3 in an existing design?

Yes, pin-to-pin compatible in SOT23 footprint, but BZX8450-C4V3-QR provides AEC-Q101 qualification, tighter thermal coefficient (−2.7 mV/K vs. −3.5 mV/K), and optimized leakage for noise-sensitive applications-requiring no layout change but enabling automotive deployment and improved stability.

Is the n.c. pin electrically isolated or internally tied?

Pin 2 is explicitly designated "not connected" in the official pinning table and graphic symbol. It is fully electrically isolated-no internal bond wire or die connection exists, and PCB layout must leave it unconnected to avoid parasitic coupling or mechanical stress-induced failure.

What is the recommended soldering profile for BZX8450-C4V3-QR?

Reflow soldering per Fig. 10: peak temperature 260 °C max, time above 217 °C ≤60 s, ramp-up rate ≤3 °C/s. Wave soldering per Fig. 11 uses 245 °C max top-side temperature. Both profiles align with IPC-J-STD-020 moisture sensitivity level 1 (MSL-1), requiring no bake prior to assembly.

BZX8450-C4V3-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:: ±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:: -55°C ~ 150°C (TA)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BZX8450-C4V3-QR FAQ

1.How can I place an order for BZX8450-C4V3-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-C4V3-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-C4V3-QR reliable?

The price and inventory of BZX8450-C4V3-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-C4V3-QR is usually 5 days.

3.What payment methods are accepted for BZX8450-C4V3-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C4V3-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-C4V3-QR?

BZX8450-C4V3-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-C4V3-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-C4V3-QR?

For technical support, including BZX8450-C4V3-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C4V3-QR requirements.

6.How does Aetrix verify that BZX8450-C4V3-QR is sourced from the original manufacturer or authorized distributors?

All BZX8450-C4V3-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-C4V3-QR meets industry standards.

7.What is the process for return or replacement of BZX8450-C4V3-QR?

All BZX8450-C4V3-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C4V3-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-C4V3-QR part is unused and in its original packaging.

Return procedure for BZX8450-C4V3-QR:

1.Submit a request within 90 days.

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

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