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

Nexperia USA Inc. BZX8450-B2V2-QR

Name: BZX8450-B2V2-QR
Brand: Nexperia USA Inc.
SKU: BZX8450-B2V2-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-B2V2-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-B2V2-QR.pdf

Description:: DIODE ZENER 2.2V 250MW TO236AB

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Product details

Overview

BZX8450-B2V2-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, rated for 2.2 V nominal regulation at 50 µA test current, with ±2 % tolerance, 250 mW power dissipation, and AEC-Q101 qualification for automotive bias networks.

For engineers reviewing the BZX8450-B2V2-QR datasheet, BZX8450-B2V2-QR pinout, BZX8450-B2V2-QR application, or BZX8450-B2V2-QR equivalent, this device serves as a precision low-power reference in battery-powered sensor interfaces, ECU voltage monitoring rails, and low-leakage signal conditioning circuits where stable 2.2 V clamping under microamp bias is required.

Technical Context

This Zener diode operates in reverse breakdown with a specified working voltage of 2.15 V to 2.25 V at I_Z = 50 µA, exhibiting low differential resistance (≤600 Ω) and a negative temperature coefficient of −3.5 mV/K. Its design targets ultra-low bias current operation, minimizing quiescent power draw in always-on subsystems.

The device features intentional cathode-side thermal coupling via solder-point junction-to-solder thermal resistance (R_th(j-sp) = 330 K/W), enabling predictable thermal behavior in compact PCB layouts. It is not intended for high-current regulation but optimized for noise-sensitive analog references and fast-switching protection where leakage control is critical.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	2.2 V at I_Z = 50 µA - defines precise clamping threshold for low-bias reference circuits
Voltage Tolerance	±2 % - ensures tight regulation window (2.15 V–2.25 V) without post-assembly trimming
Max Power Dissipation	250 mW at T_amb ≤ 25 °C - supports continuous operation in thermally constrained SOT23 footprints
Forward Voltage	≤ 0.9 V at I_F = 10 mA - enables reliable anode-cathode conduction during forward-biased transient suppression
Junction Temperature	−55 °C to +150 °C - validated for under-hood automotive environments per AEC-Q101
Reverse Leakage	≤ 1.0 µA at V_R = 1.0 V - guarantees minimal standby current in battery-critical applications
Diode Capacitance	210 pF at V_R = 0 V, f = 1 MHz - impacts high-frequency noise filtering capability in signal-path references

Pinout & Package

Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), qualified for reflow and wave soldering per JEDEC standards.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Forward-bias terminal; connects to lower-potential node in Zener configuration
2	Not Connected (n.c.)	Electrically isolated internal pad; no PCB trace or solder connection required
3	Cathode (K)	Regulated output terminal; ties to reference rail or feedback node in shunt regulator topology

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness
Low test current specification	Rated at 50 µA - enables stable regulation in µA-level bias networks typical of IoT sensors and wake-up circuits
Controlled leakage optimization	Minor intentional IR rise improves switching speed and reduces broadband noise in analog front-ends
Thermal performance mapping	R_th(j-sp) = 330 K/W - allows accurate junction temperature estimation using solder-point thermal measurement
SOT23 footprint compatibility	Standard 3-pin layout with 1.9 mm pitch - drop-in replacement for legacy BZX84 series in space-constrained designs

Applications

Automotive ECU Reference Rail

Portable Gas Sensor Bias

Use Scenario: Providing stable 2.2 V reference for ADC input scaling in engine control unit (ECU) temperature and pressure sensing channels.

IC Role / Device Role / Timing Role: Shunt voltage regulator establishing fixed reference potential for analog signal conditioning circuitry.

Use Value: Maintains <±0.044 V regulation accuracy across −40 °C to +125 °C ambient, ensuring consistent sensor calibration without active supervision.

Use Scenario: Supplying precise bias voltage to electrochemical gas sensor electrodes in handheld air quality monitors.

IC Role / Device Role / Timing Role: Low-leakage Zener clamp defining sensor operating point while drawing <1 µA standby current.

Use Value: Enables >10-year battery life in coin-cell-powered devices by limiting quiescent current to sub-microamp levels at 2.2 V.

Industrial PLC Input Protection

Medical Wearable Signal Conditioning

Use Scenario: Clamping transient overvoltage on 24 V DC input channels of programmable logic controllers to protect downstream optocouplers.

IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing short-duration surges while maintaining low steady-state leakage.

Use Value: Limits peak clamped voltage to ≤2.7 V during 100 µs transients, preventing false triggering of digital inputs.

Use Scenario: Stabilizing reference voltage for instrumentation amplifier gain-setting resistors in ECG electrode interface modules.

IC Role / Device Role / Timing Role: Noise-optimized Zener providing clean 2.2 V reference for high-gain analog signal paths.

Use Value: Delivers <10 µV_pp broadband noise floor due to controlled leakage profile, preserving µV-level biopotential resolution.

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-C2V2-Q	±5 % tolerance (2.09 V–2.31 V), higher leakage (≤1.0 µA at V_R = 1.0 V), same SOT23 package	Acceptable where tighter regulation is not required; lower cost for non-critical bias functions	Select when budget constraints outweigh precision needs and thermal drift sensitivity is low
MMSZ4678T1G	2.2 V ±5 %, 500 mW P_tot, higher r_diff (≤1000 Ω), not AEC-Q101 qualified	Higher power handling but unqualified for automotive use; larger thermal footprint required	Prefer only in industrial non-automotive systems requiring marginally higher surge energy absorption

Compared with BZX8450-B2V2-QR, the BZX84-C2V2-Q trades regulation accuracy for cost and the MMSZ4678T1G sacrifices automotive qualification and low-noise performance for higher power headroom-making the BZX8450-B2V2-QR optimal for AEC-Q101-compliant, low-leakage, precision 2.2 V reference designs.

Availability

BZX8450-B2V2-QR is available at Aetrix Electronics and suitable for automotive ECU reference rails, portable gas sensor bias networks, and industrial PLC input protection requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZX8450-B2V2-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 delivering high-performance, reliable discrete, logic, and MOSFET solutions with focus on efficiency, miniaturization, and automotive-grade robustness.

The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, low-noise voltage regulation in automotive and portable electronics where precision, leakage control, and thermal predictability are essential.

FAQ

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

The BZX8450-B2V2-QR has a nominal Zener voltage of 2.2 V, with guaranteed breakdown occurring between 2.15 V and 2.25 V at 50 µA test current. Its absolute maximum reverse voltage is not defined separately-it is designed to operate continuously in reverse breakdown within its specified power and thermal limits, not as a blocking diode.

Can this part replace older BZX84-B2V2 variants in existing designs?

Yes-BZX8450-B2V2-QR maintains identical SOT23 pinout, electrical specifications, and thermal characteristics as legacy BZX84-B2V2 parts, with added AEC-Q101 qualification and improved consistency in low-current regulation performance per Rev. 3 datasheet.

Is Pin 2 truly unused, or does it require grounding?

Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia pinning diagram and must remain electrically floating-no PCB trace, solder, or grounding is permitted. Connecting it risks altering thermal path integrity and violating qualification test conditions.

How does the ±2 % tolerance affect regulation accuracy over temperature?

At 25 °C, tolerance ensures V_Z stays within 2.15 V–2.25 V. Over −40 °C to +125 °C, total variation remains within ±5 % due to the −3.5 mV/K temperature coefficient-e.g., a 2.2 V unit shifts by ≈−0.35 V at +125 °C, yielding ~1.85 V minimum in worst-case thermal drift.

BZX8450-B2V2-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):: 2.2 V

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 4 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-B2V2-QR FAQ

1.How can I place an order for BZX8450-B2V2-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-B2V2-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-B2V2-QR reliable?

The price and inventory of BZX8450-B2V2-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-B2V2-QR is usually 5 days.

3.What payment methods are accepted for BZX8450-B2V2-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B2V2-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-B2V2-QR?

BZX8450-B2V2-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-B2V2-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-B2V2-QR?

For technical support, including BZX8450-B2V2-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B2V2-QR requirements.

6.How does Aetrix verify that BZX8450-B2V2-QR is sourced from the original manufacturer or authorized distributors?

All BZX8450-B2V2-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-B2V2-QR meets industry standards.

7.What is the process for return or replacement of BZX8450-B2V2-QR?

All BZX8450-B2V2-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B2V2-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-B2V2-QR part is unused and in its original packaging.

Return procedure for BZX8450-B2V2-QR:

1.Submit a request within 90 days.

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

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