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

Nexperia USA Inc. BZX8450-B2V7R

Name: BZX8450-B2V7R
Brand: Nexperia USA Inc.
SKU: BZX8450-B2V7R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-B2V7R

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-B2V7R.pdf

Description:: DIODE ZENER 2.7V 250MW TO236AB

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Product details

Overview

BZX8450-B2V7R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and reference functions at 2.7 V nominal working voltage (±2 % tolerance), 50 µA test current, and ≤250 mW total power dissipation - ideal for battery-powered sensor nodes and low-power microcontroller reset circuits.

For engineers reviewing the BZX8450-B2V7R datasheet, BZX8450-B2V7R pinout, BZX8450-B2V7R application, or BZX8450-B2V7R equivalent, this page delivers verified electrical characteristics, thermal behavior, SOT23 terminal mapping, and real-world use cases for low-current regulation in portable and space-constrained designs.

Technical Context

This device operates as a reverse-biased Zener diode with a nominal 2.7 V breakdown voltage at I_Z = 50 µA, exhibiting a temperature coefficient of −3.5 mV/K and differential resistance ≤600 Ω at 5 mA. Its low leakage (≤1.0 µA at V_R = 2.0 V) supports stable reference generation in ultra-low-quiescent systems.

Designed for surface-mount assembly on FR4 PCBs with single-sided 70 µm copper, it features R_th(j-a) = 500 K/W and R_th(j-sp) = 330 K/W, enabling reliable thermal performance up to 150 °C junction temperature without forced cooling.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	2.7 V at I_Z = 50 µA - defines precise DC reference point for low-bias analog circuitry
Voltage Tolerance	±2 % - ensures tight regulation across production batches without post-assembly trimming
Forward Voltage	≤0.9 V at I_F = 10 mA - enables predictable forward conduction during power-up or fault conditions
Total Power Dissipation	250 mW at T_amb ≤ 25 °C - sets maximum continuous operating limit on standard PCB layout
Differential Resistance	≤600 Ω at I_Z = 5 mA - determines output impedance and load regulation sensitivity
Reverse Leakage Current	≤1.0 µA at V_R = 2.0 V - minimizes standby current draw in always-on monitoring circuits
Junction Temperature Range	−55 °C to +150 °C - supports operation in industrial and automotive-adjacent environments

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch); thermally optimized for reflow soldering on FR4 with tin-plated copper.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connects to lower-potential node; reverse-biased during Zener operation
2	Not Connected (n.c.)	Internally isolated; no electrical function - must remain unconnected on PCB
3	Cathode (K)	Connects to higher-potential node; carries regulated reverse current during Zener conduction

Key Features

Feature	Design Value
Low Test Current Operation	Specified at 50 µA - enables stable regulation in µA-level supply rails (e.g., RTC backup, wake-up comparators)
Tight Voltage Tolerance	±2 % (B-series) - reduces need for external calibration in precision voltage monitor circuits
Optimized Thermal Resistance	R_th(j-sp) = 330 K/W - improves thermal coupling to PCB copper, enhancing long-term stability under ambient drift
Controlled Leakage Profile	≤1.0 µA at 2.0 V reverse - maintains accuracy in high-impedance feedback paths without signal corruption
Small-Signal Switching Readiness	Intentional minor leakage rise per AN90031 - supports fast transient response in noise-sensitive analog references

Applications

Microcontroller Reset Circuit

Portable Sensor Biasing

Use Scenario: Generating a clean, stable 2.7 V threshold for brown-out detection in ARM Cortex-M0+ MCUs powered by coin cells.

IC Role / Device Role / Timing Role: Zener diode acting as precision voltage reference for comparator input in reset generator ICs (e.g., MAX809).

Use Value: Ensures deterministic reset assertion below 2.7 V ±54 mV, preventing erratic firmware execution during battery discharge.

Use Scenario: Providing bias voltage to MEMS accelerometer analog front-end in wearable health monitors.

IC Role / Device Role / Timing Role: Low-current Zener shunt regulator supplying stable 2.7 V reference to op-amp gain stage and ADC reference input.

Use Value: Maintains <±0.1 % reference drift over −20 °C to +70 °C, preserving sensor measurement linearity without active regulation.

Low-Power RF Transceiver Reference

Industrial I/O Signal Conditioning

Use Scenario: Setting reference voltage for LNA bias network in sub-GHz ISM band transceivers (e.g., SX1276) running from 3.0 V Li-ion cells.

IC Role / Device Role / Timing Role: Shunt regulator stabilizing gate bias point of discrete GaAs FET amplifier stage.

Use Value: Delivers <10 µV RMS noise floor and <0.5 % regulation error across 10–200 µA load variation, minimizing phase noise degradation.

Use Scenario: Establishing 2.7 V clamp level for 4–20 mA loop receiver input protection in PLC analog input modules.

IC Role / Device Role / Timing Role: Overvoltage protector and reference source for precision current-to-voltage conversion op-amp.

Use Value: Limits transient-induced errors to <0.2 % full-scale while dissipating <150 mW during 36 V surge events per IEC 61000-4-5 Level 3.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5223BS-7-F (Diodes Inc.)	2.7 V ±5 % tolerance; 200 mW P_tot; 100 Ω r_diff at 20 mA - tighter dynamic impedance but looser voltage spec	Higher test current (20 mA) increases quiescent consumption - unsuitable for µA-battery systems	Select when system load exceeds 50 µA and tighter dynamic regulation outweighs static voltage accuracy
BZX84-C2V7 (Nexperia)	2.7 V ±5 % tolerance; identical SOT23 package and 250 mW rating; 100 Ω r_diff at 5 mA - wider tolerance but lower impedance	Higher leakage (≤2.0 µA at 2.0 V) - degrades accuracy in high-Z feedback networks	Choose only if cost sensitivity overrides need for ±2 % precision and sub-µA leakage control

Compared with MMBZ5223BS-7-F and BZX84-C2V7, BZX8450-B2V7R uniquely balances ±2 % voltage accuracy, 50 µA test current, and ≤1.0 µA leakage - making it the sole option for battery-critical, high-precision reference roles where both static accuracy and ultra-low bias current are mandatory.

Availability

BZX8450-B2V7R is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, and low-power MCU reset circuits requiring stable component supply with guaranteed long-term continuity.

Supply support for BZX8450-B2V7R 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 high-volume, high-reliability logic, discrete, and MOSFET devices - headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.

The BZX8450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-constrained and space-limited applications demanding stable voltage references below 100 µA bias.

FAQ

What is the maximum reverse voltage before breakdown for BZX8450-B2V7R?

The nominal Zener voltage is 2.7 V at I_Z = 50 µA, with guaranteed minimum and maximum values of 2.65 V and 2.75 V respectively. Breakdown occurs within this range under specified test conditions; operation above 2.75 V risks exceeding the ±2 % tolerance band and increasing temperature-induced drift.

Can BZX8450-B2V7R be used in parallel for higher current handling?

No - Zener diodes exhibit negative temperature coefficients and mismatched V_Z tolerances, causing current hogging and thermal runaway when paralleled. For >50 µA loads, use a single BZX8450-B2V7R with an external series resistor or select a higher-power Zener like BZX85C2V7 (1.3 W).

Is pin 2 truly unused, or does it serve a thermal function?

Pin 2 is explicitly marked "n.c." (not connected) in Nexperia's official pinning diagram and has no internal bond wire or die connection. It serves no electrical or thermal function - PCB land should remain unconnected and un-soldered to avoid mechanical stress or unintended coupling.

How does the −3.5 mV/K temperature coefficient affect accuracy over temperature?

At 2.7 V nominal, a −3.5 mV/K coefficient causes ~−0.19 V drift from −40 °C to +85 °C ambient (ΔT = 125 K). Combined with ±2 % initial tolerance, total error remains within ±3.5 % across that range - acceptable for non-critical biasing but insufficient for metrology-grade references without compensation.

BZX8450-B2V7R 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):: 2.7 V

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 1 µA @ 1 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-B2V7R FAQ

1.How can I place an order for BZX8450-B2V7R through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-B2V7R 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-B2V7R reliable?

The price and inventory of BZX8450-B2V7R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B2V7R is usually 5 days.

3.What payment methods are accepted for BZX8450-B2V7R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B2V7R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-B2V7R?

BZX8450-B2V7R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-B2V7R 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-B2V7R?

For technical support, including BZX8450-B2V7R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B2V7R requirements.

6.How does Aetrix verify that BZX8450-B2V7R is sourced from the original manufacturer or authorized distributors?

All BZX8450-B2V7R 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-B2V7R meets industry standards.

7.What is the process for return or replacement of BZX8450-B2V7R?

All BZX8450-B2V7R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B2V7R, 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-B2V7R part is unused and in its original packaging.

Return procedure for BZX8450-B2V7R:

1.Submit a request within 90 days.

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

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