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

Nexperia USA Inc. BZX38450-B8V2-QX

Name: BZX38450-B8V2-QX
Brand: Nexperia USA Inc.
SKU: BZX38450-B8V2-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX38450-B8V2-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: BZX38450-B8V2-QX.pdf

Description:: DIODE ZENER 8.2V 300MW SOD323

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Product details

Overview

BZX38450-B8V2-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision biasing and voltage reference in automotive and portable electronics. It delivers 8.2 V nominal regulation at 50 µA test current, with ±2 % tolerance, 300 mW power dissipation, and 6.2 Ω differential resistance at 5 mA - enabling stable operation in battery-powered sensor interfaces and ECU power rails.

For engineers reviewing the BZX38450-B8V2-QX datasheet, BZX38450-B8V2-QX pinout, BZX38450-B8V2-QX application, or BZX38450-B8V2-QX equivalent, this page provides verified electrical characteristics, AEC-Q101 qualification status, thermal resistance data, and automotive-grade marking codes to support low-power voltage reference selection and PCB layout validation.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified working voltage of 8.2 V (min 8.04 V, max 8.36 V) at I_Z = 50 µA, optimized for low-bias applications where minimal leakage and predictable temperature coefficient (+3.2 mV/K) are critical. Its 6.2 Ω dynamic impedance at 5 mA ensures tight regulation under light load variations.

Qualified per AEC-Q101, it supports junction temperatures up to 150 °C and features intentional minor leakage rise for improved switching speed and noise reduction per AN90031. Thermal resistance from junction to ambient is 415 K/W on FR4 PCB - a key constraint for thermal design in compact automotive modules.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	8.2 V at 50 µA - defines precise reference point for low-current bias networks
Voltage Tolerance	±2 % - enables high-accuracy voltage clamping without trimming
Differential Resistance	6.2 Ω at 5 mA - ensures <10 mV output shift per 1 mA load change
Forward Voltage	0.9 V at 10 mA - limits forward conduction loss in dual-direction protection schemes
Total Power Dissipation	300 mW at T_amb ≤ 25 °C - sets maximum continuous DC power in standard PCB layout
Junction Temperature Limit	150 °C - supports operation in under-hood automotive environments
AEC-Q101 Qualified	Yes - validated for automotive electronics per stress test qualification standard

Pinout & Package

SOD323 (SC-76) surface-mount plastic package: 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, cathode marked by bar on top surface.

Pin/Terminal	Circuit Role	Design Meaning
1	Cathode (K)	Connected to regulated voltage node; marking bar identifies this terminal for correct PCB orientation
2	Anode (A)	Ground or lower-potential reference; reverse-biased during Zener operation

Key Features

Feature	Design Value
Low test current operation	Specified at 50 µA - reduces quiescent current in always-on automotive circuits
Optimized leakage profile	Intentional minor IR rise per AN90031 - improves transient response and reduces broadband noise
Thermal performance	R_th(j-a) = 415 K/W - enables thermal modeling on standard FR4 with single-sided copper
Automotive qualification	AEC-Q101 compliant - meets reliability requirements for engine control, lighting, and ADAS subsystems
Compact footprint	SOD323 package - saves board space vs. DO-35 or SOD123 in high-density layouts

Applications

Automotive ECU Reference

Portable Sensor Biasing

Use Scenario: Providing stable 8.2 V reference for analog front-end circuitry in engine control units.

IC Role / Device Role / Timing Role: Zener voltage reference for ADC reference buffers and op-amp bias networks.

Use Value: ±2 % tolerance and +3.2 mV/K TC ensure <±15 mV drift over −40 °C to +125 °C operating range.

Use Scenario: Generating precision bias voltage for MEMS pressure sensors in wearable health monitors.

IC Role / Device Role / Timing Role: Low-current voltage regulator supplying sensor excitation current.

Use Value: 50 µA test current enables operation from coin-cell batteries with <1 µA standby leakage impact.

USB-C Port Protection

Industrial PLC Input Conditioning

Use Scenario: Clamping VBUS line transients in USB-C receptacle circuits with minimal capacitance loading.

IC Role / Device Role / Timing Role: Reverse-biased Zener clamp limiting overvoltage spikes to 8.2 V.

Use Value: 150 pF capacitance at 0 V ensures no signal integrity degradation on 10 Mbps USB 2.0 lines.

Use Scenario: Stabilizing 24 V input rail conditioning for isolated digital input modules in factory automation.

IC Role / Device Role / Timing Role: Pre-regulator establishing clean local 8.2 V supply for optocoupler LED drivers.

Use Value: 300 mW dissipation rating supports sustained 20 mA current draw without thermal derating on standard PCB.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX38450-C8V2-Q	±5 % tolerance (vs. ±2 %), identical 8.2 V nominal, same SOD323 package	Acceptable where tighter regulation not required; lower cost for non-critical biasing	Select when budget constraints outweigh precision needs and thermal stability is secondary
MMSZ5231B-7-F	8.2 V ±5 %, 500 mW P_tot, SOD-123 package, no AEC-Q101 qualification	Higher power margin but larger footprint and unqualified for automotive use	Choose only for industrial non-automotive designs requiring higher dissipation headroom

Compared with BZX38450-C8V2-Q, the BZX38450-B8V2-QX offers tighter voltage control essential for precision analog circuits; versus MMSZ5231B-7-F, it trades power capacity for AEC-Q101 compliance and smaller board area - making it optimal for space-constrained automotive modules needing guaranteed reliability.

Availability

BZX38450-B8V2-QX is available at Aetrix Electronics and suitable for automotive ECU reference, portable sensor biasing, USB-C port protection, and industrial PLC input conditioning requiring stable component supply across production lifecycles.

Supply support for BZX38450-B8V2-QX 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 energy-efficient solutions.

The BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for low-current voltage reference and regulation in automotive electronics and portable battery-powered systems.

FAQ

What is the maximum reverse current at 8.2 V for BZX38450-B8V2-QX?

At 8.2 V reverse bias and T_j = 25 °C, the typical reverse current is 0.1 µA, with a maximum of 0.1 µA specified across the full operating temperature range. This ultra-low leakage supports battery life extension in always-on automotive modules and IoT edge sensors.

Does BZX38450-B8V2-QX require derating above 25 °C ambient?

Yes - total power dissipation must be linearly derated above 25 °C ambient at 2.4 mW/°C, based on R_th(j-a) = 415 K/W. At 85 °C ambient, maximum allowable power drops to 156 mW to maintain T_j ≤ 150 °C, requiring careful thermal layout in enclosed enclosures.

How is the cathode identified on the SOD323 package?

The cathode is marked by a visible bar on the top surface of the SOD323 package, aligned with Pin 1 per Table 2. This matches the simplified outline graphic in the datasheet and corresponds to the "K" terminal in the pinning diagram - critical for correct orientation during automated placement.

Can BZX38450-B8V2-QX be used in parallel for higher current capability?

No - Zener diodes exhibit manufacturing spread in V_Z, causing current hogging if paralleled. The datasheet does not recommend parallel operation; instead, use a single higher-power Zener or active regulation for >250 mA loads, as the absolute maximum forward current is 250 mA.

BZX38450-B8V2-QX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZX38450-Q

Package/Case:: SC-76, SOD-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 8.2 V

Tolerance:: ±2%

Power - Max:: 300 mW

Impedance (Max) (Zzt):: 15 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 6.2 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:: SOD-323

BZX38450-B8V2-QX FAQ

1.How can I place an order for BZX38450-B8V2-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX38450-B8V2-QX 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 BZX38450-B8V2-QX reliable?

The price and inventory of BZX38450-B8V2-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B8V2-QX is usually 5 days.

3.What payment methods are accepted for BZX38450-B8V2-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B8V2-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX38450-B8V2-QX?

BZX38450-B8V2-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX38450-B8V2-QX 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 BZX38450-B8V2-QX?

For technical support, including BZX38450-B8V2-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B8V2-QX requirements.

6.How does Aetrix verify that BZX38450-B8V2-QX is sourced from the original manufacturer or authorized distributors?

All BZX38450-B8V2-QX 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 BZX38450-B8V2-QX meets industry standards.

7.What is the process for return or replacement of BZX38450-B8V2-QX?

All BZX38450-B8V2-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B8V2-QX, 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 BZX38450-B8V2-QX part is unused and in its original packaging.

Return procedure for BZX38450-B8V2-QX:

1.Submit a request within 90 days.

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

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