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

Nexperia USA Inc. BZX8450-B2V0-QR

Name: BZX8450-B2V0-QR
Brand: Nexperia USA Inc.
SKU: BZX8450-B2V0-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-B2V0-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-B2V0-QR.pdf

Description:: DIODE ZENER 2V 250MW TO236AB

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Inventory:4,353

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Product details

Overview

BZX8450-B2V0-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, providing 2.0 V nominal regulation at 50 µA test current, with ±2 % tolerance, 250 mW power dissipation, and AEC-Q101 qualification for automotive bias and reference applications.

For engineers reviewing the BZX8450-B2V0-QR datasheet, BZX8450-B2V0-QR pinout, BZX8450-B2V0-QR application, or BZX8450-B2V0-QR equivalent, this device serves as a precision low-power voltage reference in battery-powered sensors, ECU voltage monitoring, and portable logic supply stabilization where low leakage and tight tolerance are critical.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified working voltage of 2.0 V (min 1.96 V, max 2.04 V) at I_Z = 50 µA, exhibiting low differential resistance (≤600 Ω) and a negative temperature coefficient (−3.5 mV/K), enabling stable low-voltage referencing across temperature.

Its design targets ultra-low-bias operation: rated at 50 µA test current, with reverse leakage ≤1.0 µA at V_R = 1.0 V, and forward voltage ≤0.9 V at I_F = 10 mA - optimized for energy-constrained systems requiring minimal quiescent current draw.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	2.0 V (1.96–2.04 V at 50 µA); enables precise 2.0 V rail clamping or reference generation
Tolerance	±2 % (B-series); ensures tight voltage accuracy without post-production trimming
Power Dissipation	250 mW at T_amb ≤ 25 °C; supports continuous low-power regulation on standard FR4 PCB
Test Current	50 µA; allows stable regulation in microamp-level bias circuits (e.g., sensor front-ends)
Reverse Leakage	≤1.0 µA at V_R = 1.0 V; minimizes standby current in always-on automotive modules
Forward Voltage	≤0.9 V at I_F = 10 mA; ensures low-loss conduction during polarity protection or clamp recovery
Junction Temperature	−55 °C to +150 °C; supports under-hood automotive environments per AEC-Q101

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), optimized for high-density PCB layouts and reflow/wave soldering per IPC-7095 guidelines.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential node; reverse-biased during Zener operation
2	Not Connected (n.c.)	Internally unconnected; no electrical function - must remain floating or un-routed
3	Cathode (K)	Connected to higher-potential node; defines Zener breakdown direction and thermal path to PCB

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD (HBM ≥2 kV)
Low test current operation	Specified at 50 µA - enables use in nanoamp-bias sensor interfaces and wake-up circuitry
Two tolerance options	±2 % (B-series) and ~±5 % (C-series); supports cost/performance trade-off in volume production
Optimized leakage profile	Intentional minor leakage rise (vs. legacy Zeners) improves switching speed and reduces noise in dynamic bias networks
Thermal resistance	R_th(j-sp) = 330 K/W (to cathode solder point); enables predictable thermal design on standard FR4

Applications

Automotive ECU Voltage Monitoring

Portable Sensor Bias Reference

Use Scenario: Real-time monitoring of 3.3 V or 5 V supply rails in engine control units to detect undervoltage faults before system reset.

IC Role / Device Role / Timing Role: Zener shunt regulator acting as precision voltage threshold detector feeding comparator input.

Use Value: ±2 % tolerance ensures detection window stays within 50 mV of nominal rail, preventing false triggers under thermal drift.

Use Scenario: Providing stable 2.0 V reference for MEMS accelerometer signal conditioning in wireless IoT nodes powered by coin cells.

IC Role / Device Role / Timing Role: Low-current Zener reference establishing ADC reference voltage and op-amp bias point.

Use Value: 50 µA test current and ≤1.0 µA leakage at 1.0 V minimize total node quiescent current, extending battery life beyond 5 years.

USB-C Port Overvoltage Clamp

Industrial PLC Input Protection

Use Scenario: Clamping transient overvoltage on USB-C CC lines during hot-plug events to protect Type-C controller ICs.

IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing short-duration surges (<100 µs) before TVS activation.

Use Value: Low capacitance (220 pF at 0 V) avoids signal integrity degradation on high-speed CC line communication.

Use Scenario: Protecting 24 V digital input channels in programmable logic controllers against field-wiring transients and induced noise.

IC Role / Device Role / Timing Role: Pre-regulator element limiting input voltage to downstream optocoupler or Schmitt trigger.

Use Value: 250 mW power rating and −55 °C to +150 °C operating range ensure robustness in harsh factory-floor environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C2V0-Q	±5 % tolerance (C-series), higher leakage (≤1.0 µA at V_R = 1.0 V same), identical SOT23 package and pinout	Acceptable where cost sensitivity outweighs voltage accuracy; less suitable for precision analog thresholds	Select when budget constraints dominate and ±5 % regulation error is acceptable in system margin
MMSZ4678T1G	2.0 V nominal, ±5 %, 500 mW P_tot, higher r_diff (1000 Ω), not AEC-Q101 qualified	Limited to commercial-grade industrial or consumer applications; unsuitable for automotive deployment	Choose only for non-automotive designs requiring higher power headroom and no qualification requirements

Compared with BZX8450-B2V0-QR, the C-series variant trades accuracy for cost, while MMSZ4678T1G offers higher power but lacks automotive qualification and tighter regulation - making BZX8450-B2V0-QR the sole option meeting AEC-Q101 + ±2 % + 50 µA operation.

Availability

BZX8450-B2V0-QR is available at Aetrix Electronics and suitable for automotive ECU monitoring, portable sensor biasing, USB-C overvoltage clamping, and industrial PLC input protection requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BZX8450-B2V0-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, reliable discrete and logic devices for automotive, industrial, and mobile markets.

BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, high-accuracy voltage regulation in automotive electronics and battery-sensitive applications.

FAQ

What is the maximum reverse voltage that can be safely applied before breakdown?

The BZX8450-B2V0-QR has a nominal Zener voltage of 2.0 V with a guaranteed range of 1.96 V to 2.04 V at 50 µA. Its absolute maximum reverse voltage is not defined separately - operation above 2.04 V initiates controlled Zener conduction. Non-repetitive peak reverse power is limited to 40 W for 100 µs pulses, but sustained reverse bias must remain within the 250 mW total power dissipation limit.

Is Pin 2 electrically functional or should it be left unconnected?

Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia datasheet and graphic symbol. It is internally unconnected and must remain floating - no routing, grounding, or connection is permitted. PCB layout must avoid solder mask or copper contact to prevent parasitic coupling or mechanical stress.

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

The negative temperature coefficient means output voltage decreases by approximately 3.5 mV per Kelvin rise in junction temperature. Over a −40 °C to +125 °C ambient range (with self-heating), total drift is typically <±30 mV - acceptable for non-critical biasing but requires compensation in precision references. This behavior is inherent to low-voltage Zeners below ~5 V.

Can BZX8450-B2V0-QR replace older BZX84-B2V0 variants in existing designs?

Yes - BZX8450-B2V0-QR is a direct drop-in replacement for legacy BZX84-B2V0 in SOT23 packages, sharing identical pinout, electrical specs, and footprint. Key improvements include AEC-Q101 qualification, tighter process control, and updated thermal characterization (R_th(j-sp) = 330 K/W), making it suitable for upgraded automotive and industrial revisions.

BZX8450-B2V0-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 V

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 7 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-B2V0-QR FAQ

1.How can I place an order for BZX8450-B2V0-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-B2V0-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-B2V0-QR reliable?

The price and inventory of BZX8450-B2V0-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-B2V0-QR is usually 5 days.

3.What payment methods are accepted for BZX8450-B2V0-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B2V0-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-B2V0-QR?

BZX8450-B2V0-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-B2V0-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-B2V0-QR?

For technical support, including BZX8450-B2V0-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B2V0-QR requirements.

6.How does Aetrix verify that BZX8450-B2V0-QR is sourced from the original manufacturer or authorized distributors?

All BZX8450-B2V0-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-B2V0-QR meets industry standards.

7.What is the process for return or replacement of BZX8450-B2V0-QR?

All BZX8450-B2V0-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B2V0-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-B2V0-QR part is unused and in its original packaging.

Return procedure for BZX8450-B2V0-QR:

1.Submit a request within 90 days.

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

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