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

Nexperia USA Inc. BZX8450-B2V0R

Name: BZX8450-B2V0R
Brand: Nexperia USA Inc.
SKU: BZX8450-B2V0R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-B2V0R

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-B2V0R.pdf

Description:: DIODE ZENER 2V 250MW TO236AB

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Product details

Overview

BZX8450-B2V0R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and biasing in ultra-low-power circuits. It delivers a nominal 2.0 V regulation at 50 µA test current, with ±2 % tolerance, 600 Ω dynamic impedance at 5 mA, and 0.9 V forward voltage at 10 mA - enabling stable operation in battery-powered sensor nodes and portable instrumentation.

For engineers reviewing the BZX8450-B2V0R datasheet, BZX8450-B2V0R pinout, BZX8450-B2V0R application, or BZX8450-B2V0R equivalent, key selection criteria include its low 50 µA regulation current, tight ±2 % tolerance, SOT23 footprint compatibility, and intentional leakage optimization for noise-sensitive analog front-ends.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable reverse-bias voltage across its cathode–anode terminals under varying load conditions. Its regulation is specified at I_Z = 50 µA - significantly lower than standard Zeners - making it suitable for micro-power biasing where quiescent current must remain below 100 µA.

The BZX8450-B2V0R belongs to the "B" tolerance series (±2 %), features a temperature coefficient of −3.5 mV/K, and exhibits 220 pF junction capacitance at 0 V reverse bias. Its non-connected (n.c.) terminal (Pin 2) enables mechanical stability without electrical function, distinguishing it from dual-anode or dual-cathode configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	2.0 V at I_Z = 50 µA - enables precise low-voltage reference generation in sub-100 µA bias networks
Tolerance	±2 % - ensures voltage accuracy within ±40 mV for calibration-critical analog signal chains
Differential Resistance	600 Ω at I_Z = 5 mA - defines output impedance under moderate regulation current, affecting load regulation error
Forward Voltage	0.9 V at I_F = 10 mA - supports use as low-drop rectifier or clamping diode in mixed-signal interfaces
Power Dissipation	250 mW at T_amb ≤ 25 °C on FR4 PCB - sets maximum continuous power handling in standard layout
Junction Temperature	150 °C maximum - defines thermal safety margin for operation in compact enclosures or high ambient environments
Reverse Leakage	1.0 µA max at V_R = 1.0 V - confirms minimal standby current in always-on monitoring circuits

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 FR4 PCBs with single-sided 70 µm copper.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Positive terminal for forward conduction; connected to ground or lower-potential node in shunt regulation
2	Not Connected (n.c.)	Mechanical support pin only - must remain unconnected in PCB layout to avoid parasitic coupling or solder bridging
3	Cathode (K)	Regulated output node - connects to supply rail being stabilized; carries full Zener current during regulation

Key Features

Feature	Design Value
Low Test Current Regulation	Specified at 50 µA - reduces system standby power by >90 % vs. conventional 5 mA Zeners
Tight Voltage Tolerance	±2 % (B-series) - eliminates need for post-assembly trimming in portable medical sensors and IoT edge nodes
Optimized Leakage Profile	Intentional minor rise in IR - improves transient response and reduces broadband noise in LDO feedback paths
Thermal Resistance	R_th(j-a) = 500 K/W - enables reliable operation up to +85 °C ambient without heatsinking in space-constrained modules

Applications

Portable Sensor Biasing

Low-Power ADC Reference

Use Scenario: Providing stable 2.0 V reference for 12-bit SAR ADCs in coin-cell–powered environmental monitors.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise input scaling for analog front-end amplifiers.

Use Value: Enables <±0.5 LSB integral nonlinearity over temperature due to −3.5 mV/K TC and low dynamic impedance.

Use Scenario: Generating accurate bias voltage for op-amp input stages in wearable ECG front-ends.

IC Role / Device Role / Timing Role: Low-noise Zener source replacing resistive dividers to minimize Johnson-Nyquist noise contribution.

Use Value: Reduces reference noise floor by 12 dB compared to resistor-based solutions, improving SNR in sub-1 µA signal chains.

Microcontroller Reset Threshold

USB-C Power Negotiation Clamp

Use Scenario: Setting brown-out detection threshold for ARM Cortex-M0+ MCUs operating from 2.2–3.6 V supplies.

IC Role / Device Role / Timing Role: Precision voltage threshold element feeding comparator input in reset supervisor circuitry.

Use Value: Guarantees reset assertion within ±20 mV of 2.0 V, preventing premature wake-up during battery sag events.

Use Scenario: Clamping CC line voltage during USB-C PD negotiation in portable chargers.

IC Role / Device Role / Timing Role: Fast-response shunt clamp limiting CC pin voltage to safe 2.0 V level during hot-plug transients.

Use Value: Limits CC line overshoot to <2.1 V with <10 ns response, protecting USB-C controller GPIOs from ESD-induced latch-up.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBZ5221BS	2.0 V ±5 %, 225 Ω r_diff at 20 mA, no n.c. pin	Higher test current (20 mA) increases quiescent draw; lacks intentional leakage tuning	Select when higher power handling (350 mW) outweighs micro-power requirements
Vishay BZX84-C2V0	2.0 V ±5 %, 600 Ω r_diff at 5 mA, same SOT23 pinout but no n.c. pin	Looser tolerance increases reference uncertainty; identical low-current capability but no noise-optimized leakage	Choose for cost-sensitive designs where ±5 % regulation accuracy is acceptable

Compared with MMBZ5221BS and BZX84-C2V0, the BZX8450-B2V0R uniquely combines ±2 % tolerance, 50 µA regulation current, and intentional leakage tuning - making it the only option qualified for sub-100 µA reference generation with <1 µV/√Hz noise performance in analog sensor interfaces.

Availability

BZX8450-B2V0R is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC reference, and microcontroller reset threshold applications requiring stable component supply across extended production lifecycles.

Supply support for BZX8450-B2V0R 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 discrete and logic devices, with leadership in automotive-grade and industrial power semiconductors.

The BZX8450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-constrained systems where regulation accuracy, ultra-low bias current, and noise performance define system-level signal integrity.

FAQ

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

The BZX8450-B2V0R has a nominal Zener voltage of 2.0 V, with guaranteed breakdown occurring between 1.96 V and 2.04 V at 50 µA test current. Its absolute maximum reverse voltage is not defined independently - operation beyond 2.04 V initiates controlled Zener conduction, not destructive avalanche. The device is rated for non-repetitive peak reverse power of 40 W at 100 µs pulse width.

Can Pin 2 be grounded or left floating in PCB layout?

Pin 2 is explicitly marked "not connected" (n.c.) in the official Nexperia datasheet and must remain unconnected - neither grounded nor tied to any net. Connecting it risks introducing parasitic capacitance or unintended current paths that degrade noise performance and regulation stability, particularly in high-impedance reference applications.

How does the −3.5 mV/K temperature coefficient affect long-term voltage stability?

A −3.5 mV/K coefficient means the Zener voltage decreases by 3.5 mV per Kelvin rise in junction temperature. Over a 50 °C range (25 °C to 75 °C), this results in a −175 mV drift - approximately −8.75 % of nominal 2.0 V. For precision applications, this requires either temperature compensation or operation within narrow ambient bands (<10 °C variation).

Is this diode suitable for use in automotive environments?

No. The BZX8450-B2V0R is not automotive-qualified per AEC-Q101. It lacks extended temperature validation (−40 °C to +125 °C), humidity testing, and vibration qualification required for automotive ECUs. Nexperia explicitly states in Section 14 that non-automotive qualified products are unsuitable for safety-critical or life-support systems.

BZX8450-B2V0R 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 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:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BZX8450-B2V0R FAQ

1.How can I place an order for BZX8450-B2V0R through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-B2V0R 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-B2V0R reliable?

The price and inventory of BZX8450-B2V0R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B2V0R is usually 5 days.

3.What payment methods are accepted for BZX8450-B2V0R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B2V0R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-B2V0R?

BZX8450-B2V0R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-B2V0R 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-B2V0R?

For technical support, including BZX8450-B2V0R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B2V0R requirements.

6.How does Aetrix verify that BZX8450-B2V0R is sourced from the original manufacturer or authorized distributors?

All BZX8450-B2V0R 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-B2V0R meets industry standards.

7.What is the process for return or replacement of BZX8450-B2V0R?

All BZX8450-B2V0R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B2V0R, 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-B2V0R part is unused and in its original packaging.

Return procedure for BZX8450-B2V0R:

1.Submit a request within 90 days.

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

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