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

Nexperia USA Inc. BZX8450-B4V7R

Name: BZX8450-B4V7R
Brand: Nexperia USA Inc.
SKU: BZX8450-B4V7R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-B4V7R

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-B4V7R.pdf

Description:: DIODE ZENER 4.7V 250MW TO236AB

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Product details

Overview

BZX8450-B4V7R 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 4.7 V nominal regulation at 50 µA test current, with ±2 % tolerance, 250 mW total power dissipation, and 140 pF capacitance at 0 V - enabling stable operation in battery-powered sensor nodes and microcontroller reset circuits.

For engineers reviewing the BZX8450-B4V7R datasheet, BZX8450-B4V7R pinout, BZX8450-B4V7R application, or BZX8450-B4V7R equivalent, key selection criteria include low-test-current regulation accuracy, thermal resistance (330 K/W junction-to-solder-point), reverse leakage (<3 µA at 3.0 V), differential resistance (80 Ω at 5 mA), and SOT23 footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified working voltage of 4.61 V to 4.79 V at I_Z = 50 µA, exhibiting a temperature coefficient of −2.7 mV/K and differential resistance of 80 Ω at 5 mA. Its intentional low-leakage design minimizes quiescent current draw in always-on monitoring circuits.

The device uses silicon planar technology with an anode-cathode-no-connect terminal configuration in SOT23. Thermal performance is characterized by R_th(j-a) = 500 K/W (free air) and R_th(j-sp) = 330 K/W (solder point), supporting reliable operation up to 150 °C junction temperature under defined PCB mounting conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	4.7 V at I_Z = 50 µA - enables accurate low-bias voltage reference for MCU brown-out detection
Voltage Tolerance	±2 % - ensures tight regulation across production batches without post-assembly trimming
Max Power Dissipation	250 mW at T_amb ≤ 25 °C - supports continuous operation in compact SOT23 footprint with standard FR4 PCB
Differential Resistance	80 Ω at I_Z = 5 mA - maintains stable output under small load variations in feedback networks
Reverse Leakage Current	≤3.0 µA at V_R = 3.0 V - minimizes standby power loss in battery-critical applications
Capacitance	140 pF at V_R = 0 V, f = 1 MHz - limits high-frequency noise coupling in analog reference paths
Forward Voltage	≤0.9 V at I_F = 10 mA - allows use as polarity protection diode in dual-role designs

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), rated for −55 °C to +150 °C ambient operation and compatible with standard reflow/wave soldering profiles.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connects to lower-potential side of bias network; reverse-biased during regulation
2	No Connect (n.c.)	Internally unconnected; must remain floating - no PCB trace or thermal pad connection
3	Cathode (K)	Connects to regulated output node; carries full Zener current during operation

Key Features

Feature	Design Value
Low test current specification	Rated at 50 µA - reduces system-level standby current by >90 % vs. conventional 5 mA Zeners
Tight voltage tolerance	±2 % series (B-grade) - eliminates need for binning or external trimming in precision references
Optimized leakage profile	Controlled IR < 3 µA at 3 V - balances noise suppression and ultra-low-power operation
Thermal robustness	R_th(j-sp) = 330 K/W - enables sustained 250 mW dissipation on minimal copper area
High-reliability packaging	SOT23 with tin-plated terminations - qualified per J-STD-020 moisture sensitivity level 1

Applications

Microcontroller Reset Circuit

Portable Sensor Biasing

Use Scenario: Provides clean, low-drift reset threshold for ARM Cortex-M0+ MCUs in wearable health monitors.

IC Role / Device Role / Timing Role: Zener reference element in RC-based reset generator, setting precise 4.7 V trip point.

Use Value: Enables guaranteed reset assertion down to 2.2 V supply while consuming <1 µA quiescent current.

Use Scenario: Supplies stable bias voltage to MEMS accelerometer signal chain in Bluetooth LE beacons.

IC Role / Device Role / Timing Role: Low-noise voltage reference for op-amp input stage and ADC reference divider.

Use Value: Delivers 4.7 V ±94 mV over −40 °C to +85 °C, reducing offset drift by 40 % vs. resistor-divider alternatives.

IoT Node Power Monitoring

USB-C Port Voltage Clamp

Use Scenario: Monitors Li-ion battery voltage via resistive divider feeding ADC in smart lock firmware.

IC Role / Device Role / Timing Role: Clamping diode protecting ADC input against overvoltage during battery insertion transients.

Use Value: Limits input to 4.7 V with <10 ns response, preventing ADC saturation without loading divider network.

Use Scenario: Protects USB-C CC line ESD protection IC from overvoltage during hot-plug events.

IC Role / Device Role / Timing Role: Secondary clamp after TVS, absorbing residual energy below 5 V logic threshold.

Use Value: Activates at 4.61 V with 80 Ω dynamic impedance, clamping overshoot to <5.1 V within 100 ns.

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	4.7 V ±5 %, 225 mW, 100 Ω r_diff, 200 µA IR at 3 V	Higher leakage increases standby current in battery systems	Select when cost sensitivity outweighs leakage and tolerance requirements
Diodes Inc. BZX84-C4V7	4.7 V ±5 %, 300 mW, 90 Ω r_diff, 100 nA IR at 3 V	Lower leakage but looser tolerance requires calibration in precision circuits	Select for high-reliability industrial sensors where leakage dominates over voltage accuracy

Compared with BZX8450-B4V7R, MMBZ5225BS trades tighter thermal stability for higher leakage, while BZX84-C4V7 sacrifices voltage accuracy to achieve nanoampere-level leakage - making BZX8450-B4V7R optimal for applications requiring simultaneous ±2 % regulation and sub-microampere standby current.

Availability

BZX8450-B4V7R is available at Aetrix Electronics and suitable for portable medical devices, wireless sensor networks, and USB peripheral power management requiring stable component supply across multi-year production cycles.

Supply support for BZX8450-B4V7R 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, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

BZX8450-B4V7R belongs to Nexperia's low-current Zener regulator family, engineered specifically for ultra-low-power voltage reference and biasing in space-constrained, battery-operated electronics.

FAQ

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

The BZX8450-B4V7R has a nominal Zener voltage of 4.7 V, with a guaranteed breakdown range of 4.61 V to 4.79 V at 50 µA test current. Its absolute maximum non-repetitive peak reverse voltage is not specified; instead, it is rated for continuous operation up to its limiting reverse power dissipation of 40 W in 100 µs pulses, with steady-state dissipation capped at 250 mW.

Can this Zener diode be used in forward conduction mode?

Yes - the BZX8450-B4V7R exhibits a forward voltage of ≤0.9 V at 10 mA, making it usable as a low-drop rectifier or polarity protection diode. However, its primary design intent and characterization are for reverse-bias Zener regulation; forward-mode parameters are secondary and not optimized for switching or high-current applications.

How does the "n.c." pin affect PCB layout and thermal design?

Pin 2 is internally not connected and must remain electrically isolated on the PCB - no trace, pad, or thermal relief should attach to it. This preserves the specified thermal resistance values (R_th(j-sp) = 330 K/W), as connecting pin 2 would alter heat flow paths and degrade power handling capability under sustained 250 mW operation.

Is this part suitable for automotive applications?

No - the BZX8450-B4V7R is not AEC-Q200 qualified and lacks automotive-specific reliability testing, temperature cycling validation, or PPAP documentation. Nexperia explicitly states that non-automotive qualified products like this Zener diode are unsuitable for safety-critical or life-support systems, including automotive ECUs, ADAS modules, or infotainment power rails.

BZX8450-B4V7R Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZX8450

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 4.7 V

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 3 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-B4V7R FAQ

1.How can I place an order for BZX8450-B4V7R through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-B4V7R 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-B4V7R reliable?

The price and inventory of BZX8450-B4V7R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B4V7R is usually 5 days.

3.What payment methods are accepted for BZX8450-B4V7R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B4V7R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-B4V7R?

BZX8450-B4V7R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-B4V7R 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-B4V7R?

For technical support, including BZX8450-B4V7R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B4V7R requirements.

6.How does Aetrix verify that BZX8450-B4V7R is sourced from the original manufacturer or authorized distributors?

All BZX8450-B4V7R 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-B4V7R meets industry standards.

7.What is the process for return or replacement of BZX8450-B4V7R?

All BZX8450-B4V7R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B4V7R, 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-B4V7R part is unused and in its original packaging.

Return procedure for BZX8450-B4V7R:

1.Submit a request within 90 days.

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

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