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

Nexperia USA Inc. BZX8450-B5V1-QR

Name: BZX8450-B5V1-QR
Brand: Nexperia USA Inc.
SKU: BZX8450-B5V1-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-B5V1-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-B5V1-QR.pdf

Description:: DIODE ZENER 5.1V 250MW TO236AB

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Inventory:6,616

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Product details

Overview

BZX8450-B5V1-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and clamping in battery-powered systems. It delivers 5.1 V nominal regulation at 50 µA test current, with ±2 % tolerance, 500 Ω typical differential resistance at 5 mA, and AEC-Q101 qualification for automotive use.

For engineers reviewing the BZX8450-B5V1-QR datasheet, BZX8450-B5V1-QR pinout, BZX8450-B5V1-QR application, or BZX8450-B5V1-QR equivalent, this page provides verified pin configuration, thermal resistance data (R_th(j-a) = 500 K/W), leakage behavior under reverse bias, and automotive-grade reliability context - all critical for low-power analog sensing and ECU power-rail protection designs.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified working voltage of 5.00 V to 5.20 V at I_Z = 50 µA, exhibiting a temperature coefficient of −2.0 mV/K and diode capacitance of 130 pF at 0 V. Its low test current enables stable regulation in micro-power circuits where quiescent current must remain below 100 µA.

The device features intentional minor leakage optimization per AN90031 for fast switching and noise reduction, and supports non-repetitive surge power up to 40 W (100 µs pulse). Junction-to-ambient thermal resistance is 500 K/W on FR4 PCB with single-sided copper.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	5.1 V at I_Z = 50 µA - defines precise reference point for low-bias voltage stabilization
Voltage Tolerance	±2 % - ensures tight regulation window (5.00–5.20 V) critical for ADC reference accuracy
Differential Resistance	500 Ω max at I_Z = 5 mA - limits output impedance impact on load regulation error
Forward Voltage	0.9 V max at I_F = 10 mA - constrains conduction loss during forward-biased transient clamping
Total Power Dissipation	250 mW at T_amb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB
Junction Temperature	−55 °C to +150 °C - supports operation across full automotive ambient range
AEC-Q101 Qualified	Yes - validated for automotive electronics per stress test qualification for discrete semiconductors

Pinout & Package

SOT23 plastic surface-mounted package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pitch); thermally optimized for reflow soldering on FR4 PCB with single-sided 70 μm copper.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential node in reverse-bias regulation; carries forward current during overvoltage clamping
2	Not Connected (n.c.)	Electrically isolated terminal; no internal bond wire or die connection - must be left floating
3	Cathode (K)	Connected to higher-potential node; serves as voltage reference output and primary heat path to PCB solder point (R_th(j-sp) = 330 K/W)

Key Features

Feature	Design Value
Low test current operation	Specified at 50 µA - enables stable regulation in ultra-low-power sensor nodes and wake-up circuits
Optimized leakage profile	Minor intentional rise per AN90031 - reduces switching noise and improves transient response in feedback loops
Automotive qualification	AEC-Q101 compliant - validated for engine control units, body electronics, and ADAS power management
Thermal performance	R_th(j-sp) = 330 K/W - enhances reliability in thermally constrained modules by maximizing heat transfer via cathode pad
Small footprint	SOT23 package - saves board space in dense automotive ECUs and portable instrumentation without sacrificing derating margin

Applications

Automotive Sensor Reference

Portable Battery Monitor

Use Scenario: Providing stable 5.1 V reference for analog front-end of tire pressure monitoring system (TPMS) MCU.

IC Role / Device Role / Timing Role: Zener voltage reference for ADC input scaling and supply rail supervision.

Use Value: ±2 % tolerance and −2.0 mV/K tempco ensure <±10 mV drift over −40 °C to +125 °C, meeting ASIL-A sensor accuracy requirements.

Use Scenario: Regulating reference voltage for coulomb counter IC in Bluetooth earbud battery management.

IC Role / Device Role / Timing Role: Low-quiescent voltage clamp enabling <1 µA standby current in fuel gauge subsystem.

Use Value: 50 µA test current and 250 mW dissipation allow direct connection to 3.7 V Li-ion cell with minimal loading, extending runtime by >8 hours per charge cycle.

Industrial PLC Input Protection

Medical Wearable Signal Conditioning

Use Scenario: Clamping 24 V digital input transients in programmable logic controller I/O module.

IC Role / Device Role / Timing Role: Reverse-bias transient voltage suppressor limiting spike energy before optocoupler input stage.

Use Value: 40 W non-repetitive surge rating (100 µs) absorbs IEC 61000-4-4 level 3 surges without degradation, preserving signal integrity.

Use Scenario: Stabilizing bias voltage for op-amp-based ECG amplifier in patch-style cardiac monitor.

IC Role / Device Role / Timing Role: Precision DC reference source for gain-setting network and common-mode rejection tuning.

Use Value: 130 pF capacitance and low leakage (<0.05 µA at 3 V reverse) prevent high-frequency coupling into µV-level biopotential signals.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5221BS-7-F	5.1 V, ±5 % tolerance, 600 Ω r_diff, SOT23, no AEC-Q101 qualification	Lacks automotive qualification; higher voltage spread increases ADC offset uncertainty	Acceptable for consumer wearables but not for automotive or industrial safety-critical functions
BZX84-C5V1	5.1 V, ±5 % tolerance, 600 Ω r_diff, same SOT23 package, AEC-Q101 qualified	Looser tolerance and higher dynamic impedance reduce reference stability under varying load	Valid drop-in for cost-sensitive automotive modules where ±5 % regulation is acceptable

Compared with BZX8450-B5V1-QR, MMBZ5221BS-7-F trades automotive reliability for lower cost, while BZX84-C5V1 retains qualification but sacrifices precision - making the B5V1-QR optimal where both accuracy and AEC-Q101 compliance are mandatory.

Availability

BZX8450-B5V1-QR is available at Aetrix Electronics and suitable for automotive ECU design, portable medical instrumentation, industrial PLC input stages, and battery-powered sensor nodes requiring stable component supply with guaranteed long-term continuity.

Supply support for BZX8450-B5V1-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.

The BZX8450-Q series belongs to Nexperia's automotive-grade Zener regulator portfolio, engineered specifically for low-current precision reference and clamping in harsh-environment electronics where AEC-Q101 validation and thermal robustness are essential.

FAQ

What is the maximum reverse current at 3 V for BZX8450-B5V1-QR?

At 3 V reverse bias and T_j = 25 °C, the typical reverse current is less than 0.05 µA, as confirmed in Table 8 of the datasheet for the B-series 5.1 V variant. This ultra-low leakage supports micro-power operation in always-on sensor circuits without measurable battery drain.

Can BZX8450-B5V1-QR replace BZX84-C5V1 in an existing design?

Yes, it can physically replace BZX84-C5V1 due to identical SOT23 package and pinout, but offers tighter ±2 % tolerance and lower 500 Ω differential resistance versus ±5 % and 600 Ω. Designers should verify if improved regulation accuracy affects downstream comparator thresholds or ADC reference stability.

Is the n.c. pin electrically isolated or internally tied to substrate?

Pin 2 is explicitly marked "not connected" in Table 2 and has no internal bond wire or die connection. It is fully electrically isolated and must remain unconnected on the PCB - routing traces or thermal pads to it may cause unintended parasitic coupling or mechanical stress.

How does the −2.0 mV/K temperature coefficient affect long-term voltage stability?

The negative temperature coefficient means output voltage decreases by 2.0 mV per Kelvin rise in junction temperature. Over a 100 K range (−40 °C to +60 °C ambient), this produces ~200 mV drift - mitigated by layout techniques that minimize self-heating and by selecting the B-series for its tighter initial tolerance to constrain total error budget.

BZX8450-B5V1-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):: 5.1 V

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 60 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 3 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-B5V1-QR FAQ

1.How can I place an order for BZX8450-B5V1-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-B5V1-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-B5V1-QR reliable?

The price and inventory of BZX8450-B5V1-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-B5V1-QR is usually 5 days.

3.What payment methods are accepted for BZX8450-B5V1-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B5V1-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-B5V1-QR?

BZX8450-B5V1-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-B5V1-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-B5V1-QR?

For technical support, including BZX8450-B5V1-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B5V1-QR requirements.

6.How does Aetrix verify that BZX8450-B5V1-QR is sourced from the original manufacturer or authorized distributors?

All BZX8450-B5V1-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-B5V1-QR meets industry standards.

7.What is the process for return or replacement of BZX8450-B5V1-QR?

All BZX8450-B5V1-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B5V1-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-B5V1-QR part is unused and in its original packaging.

Return procedure for BZX8450-B5V1-QR:

1.Submit a request within 90 days.

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

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