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

Nexperia USA Inc. BZX8450-B2V4-QR

Name: BZX8450-B2V4-QR
Brand: Nexperia USA Inc.
SKU: BZX8450-B2V4-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-B2V4-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-B2V4-QR.pdf

Description:: DIODE ZENER 2.4V 250MW TO236AB

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Product details

Overview

BZX8450-B2V4-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in low-power circuits. It delivers a nominal 2.4 V regulation at 50 µA test current, with ±2 % tolerance, 200 mA peak forward current, and 250 mW total power dissipation - ideal for automotive sensor signal conditioning and portable battery-powered voltage stabilization.

For engineers reviewing the BZX8450-B2V4-QR datasheet, BZX8450-B2V4-QR pinout, BZX8450-B2V4-QR application, or BZX8450-B2V4-QR equivalent, key selection criteria include its AEC-Q101 qualification, low-leakage optimized switching behavior, 2.35–2.45 V working voltage range at I_Z = 50 µA, and thermal resistance of 500 K/W (junction-to-ambient).

Technical Context

This Zener diode operates in reverse breakdown to maintain stable DC voltage under low-current conditions. Its specified regulation at 50 µA enables ultra-low quiescent current designs, while the intentional minor leakage rise (per AN90031) improves transient response and reduces noise in analog front-ends.

The device features a 2.4 V nominal Zener voltage with ±2 % tolerance (B-series), differential resistance ≤600 Ω at I_Z = 50 µA, temperature coefficient of −3.5 mV/K, and junction-to-ambient thermal resistance of 500 K/W on FR4 PCB - all validated per AEC-Q101 stress testing for automotive reliability.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	2.35 V to 2.45 V at I_Z = 50 µA - ensures tight regulation in low-bias reference circuits
Tolerance	±2 % - supports high-accuracy voltage setting without trimming
Power Dissipation	250 mW at T_amb ≤ 25 °C - defines maximum continuous DC load capability on standard FR4 PCB
Forward Voltage V_F	≤ 0.9 V at I_F = 10 mA - limits conduction loss during forward bias or ESD protection paths
Reverse Current I_R	≤ 2.0 µA at V_R = 1.0 V - confirms low standby leakage for battery-critical applications
Junction Temperature	−55 °C to +150 °C - enables operation in under-hood automotive environments
AEC-Q101 Qualified	Yes - certified for automotive-grade discrete semiconductor reliability per stress test requirements

Pinout & Package

Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), optimized for automated assembly and space-constrained PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Forward-biased terminal; connects to lower-potential node in Zener regulation configuration
2	Not Connected (n.c.)	Internally unconnected; must remain floating - no PCB trace or solder mask required
3	Cathode (K)	Reverse-biased terminal; connects to higher-potential node and serves as voltage reference output

Key Features

Feature	Design Value
Low test current operation	Specified at 50 µA - enables use in microamp-level bias networks without loading error
Optimized leakage profile	Intentional minor IR rise per AN90031 - enhances switching speed and reduces broadband noise in sensing nodes
AEC-Q101 qualification	Qualified for automotive applications - guarantees robustness against temperature cycling, humidity, and mechanical shock
Thermal performance	R_th(j-a) = 500 K/W - allows predictable derating up to 125 °C ambient with minimal heatsinking
Small-footprint packaging	SOT23 footprint - supports high-density routing and compatibility with standard pick-and-place equipment

Applications

Automotive Cabin Sensors

Portable Medical Monitors

Use Scenario: Voltage reference for MEMS pressure and temperature sensors in HVAC control modules.

IC Role / Device Role / Timing Role: Zener reference diode providing stable 2.4 V bias to ADC input stages and op-amp comparators.

Use Value: ±2 % tolerance and −3.5 mV/K TC ensure <±10 mV drift over −40 °C to +125 °C, meeting ASIL-B functional safety margin requirements.

Use Scenario: Low-power voltage regulation for battery-operated pulse oximeter analog front-end.

IC Role / Device Role / Timing Role: Precision shunt regulator supplying reference voltage to transimpedance amplifier and LED driver bias rails.

Use Value: 50 µA test current and ≤2 µA leakage at 1 V enable >72-hour runtime on CR2032 coin cell without compromising signal integrity.

Industrial IoT Node Power Management

Consumer Audio Bias Networks

Use Scenario: Standby-mode voltage clamp for LoRaWAN node MCU supply rail during deep-sleep cycles.

IC Role / Device Role / Timing Role: Low-current Zener clamping diode limiting V_DD variation across wide temperature and battery discharge ranges.

Use Value: 250 mW power rating and 200 mA peak surge capability protect against transient overvoltage events during wake-up transitions.

Use Scenario: DC bias stabilization for Class-AB headphone amplifier input stage in wireless earbuds.

IC Role / Device Role / Timing Role: Shunt reference maintaining fixed common-mode voltage for differential input pairs.

Use Value: 600 Ω dynamic impedance at 50 µA ensures <0.5 mV ripple coupling into audio path, preserving SNR >105 dB.

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-C2V4	±5 % tolerance, higher r_diff (≤100 Ω at I_Z = 1 mA), non-AEC-Q101 qualified	Acceptable for consumer-grade cost-sensitive designs where ±2 % accuracy and automotive qualification are not required	Select when budget constraints outweigh precision and automotive compliance needs
MMSZ4676T1G	2.4 V nominal, ±5 %, 500 mW P_tot, SOD-123 package, no AEC-Q101 certification	Larger footprint and higher thermal resistance (625 K/W) limit use in dense automotive PCBs	Prefer only if SOD-123 is already standardized in legacy production and AEC-Q101 is not mandated

Compared with BZX8450-B2V4-QR, BZX84-C2V4 sacrifices accuracy and automotive reliability for lower cost, while MMSZ4676T1G trades package miniaturization and thermal performance for broader distributor availability - making the BZX8450-B2V4-QR optimal for new AEC-Q101-compliant designs requiring tight tolerance and SOT23 integration.

Availability

BZX8450-B2V4-QR is available at Aetrix Electronics and suitable for automotive cabin sensors, portable medical monitors, and industrial IoT node power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BZX8450-B2V4-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 specializing in high-performance, reliable discrete, logic, and MOSFET devices, with leadership in automotive-qualified components and energy-efficient solutions.

The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current voltage reference and regulation in harsh-environment automotive and portable electronics.

FAQ

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

The BZX8450-B2V4-QR has a nominal Zener voltage of 2.4 V with a guaranteed range of 2.35 V to 2.45 V at 50 µA test current. Its absolute maximum reverse voltage is not defined independently - it enters controlled breakdown precisely within this range. Operation above 2.45 V at rated current will increase power dissipation but remains within specification as long as P_tot ≤ 250 mW and T_j ≤ 150 °C.

Can this Zener diode be used in forward conduction mode like a standard diode?

Yes - the BZX8450-B2V4-QR exhibits a forward voltage ≤0.9 V at 10 mA, matching typical silicon diode behavior. It is routinely used in dual-role configurations: reverse-biased for voltage regulation and forward-biased for ESD protection or polarity protection, provided forward current stays within the 200 mA peak limit and average power remains below 250 mW.

How does the "B" suffix differ from "C" in the BZX8450-Q series?

The "B" suffix denotes ±2 % tolerance on Zener voltage (e.g., BZX8450-B2V4-QR: 2.35–2.45 V), while "C" indicates approximately ±5 % tolerance (e.g., BZX8450-C2V4-QR: 2.28–2.52 V). Both share identical package, thermal specs, and AEC-Q101 qualification, but "B" parts are selected for tighter regulation in precision analog circuits.

Is the NC pin (Pin 2) safe to connect to ground or leave unmasked on the PCB?

Pin 2 is internally not connected and must remain electrically floating - neither grounded nor tied to any net. While leaving it unmasked poses no reliability risk, best practice is to omit solder paste and avoid copper traces beneath it to prevent accidental shorting during reflow or contamination. The SOT23 footprint drawing explicitly defines Pin 2 as n.c. with no internal bond wire.

BZX8450-B2V4-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):: 2.4 V

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 2 µA @ 1 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-B2V4-QR FAQ

1.How can I place an order for BZX8450-B2V4-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-B2V4-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-B2V4-QR reliable?

The price and inventory of BZX8450-B2V4-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-B2V4-QR is usually 5 days.

3.What payment methods are accepted for BZX8450-B2V4-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B2V4-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-B2V4-QR?

BZX8450-B2V4-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-B2V4-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-B2V4-QR?

For technical support, including BZX8450-B2V4-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B2V4-QR requirements.

6.How does Aetrix verify that BZX8450-B2V4-QR is sourced from the original manufacturer or authorized distributors?

All BZX8450-B2V4-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-B2V4-QR meets industry standards.

7.What is the process for return or replacement of BZX8450-B2V4-QR?

All BZX8450-B2V4-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B2V4-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-B2V4-QR part is unused and in its original packaging.

Return procedure for BZX8450-B2V4-QR:

1.Submit a request within 90 days.

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

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