Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Nexperia USA Inc. BZX8450-C3V3-QR

Name: BZX8450-C3V3-QR
Brand: Nexperia USA Inc.
SKU: BZX8450-C3V3-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BZX8450-C3V3-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-C3V3-QR.pdf

Description:: DIODE ZENER 3.3V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:7

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BZX8450-C3V3-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, rated for 3.3 V nominal regulation at 50 µA test current, with ±5 % tolerance, 250 mW total power dissipation, and AEC-Q101 qualification for automotive use - deployed in bias networks and low-power reference circuits.

For engineers reviewing the BZX8450-C3V3-QR datasheet, BZX8450-C3V3-QR pinout, BZX8450-C3V3-QR application, or BZX8450-C3V3-QR equivalent, this page delivers verified electrical specs, terminal mapping, thermal resistance data, automotive qualification status, and real-world use cases in portable and automotive electronics.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining stable 3.3 V output across load variations by conducting reverse current above its breakdown threshold. Its specified 50 µA test current enables ultra-low quiescent operation ideal for battery-powered sensor nodes and microcontroller reset circuits.

It features intentional leakage optimization per AN90031 for fast switching and reduced noise in signal conditioning paths. Thermal resistance from junction to ambient is 500 K/W on FR4 PCB, limiting continuous power handling to 250 mW at ≤25 °C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	3.3 V at I_Z = 50 µA - defines precise regulation point for low-bias analog references
Voltage Tolerance	±5 % - ensures predictable clamping within 3.13 V to 3.47 V under production conditions
Max Power Dissipation	250 mW at T_amb ≤ 25 °C - sets absolute upper limit for continuous DC power in standard PCB layout
Differential Resistance	≤600 Ω at I_Z = 50 µA - indicates regulation stiffness; lower values improve line/load regulation performance
Forward Voltage	≤0.9 V at I_F = 10 mA - defines forward conduction drop when used in polarity protection or OR-ing configurations
Junction Temperature	−55 °C to +150 °C - supports operation in under-hood automotive environments and industrial edge nodes
AEC-Q101 Qualified	Yes - validated for automotive discrete semiconductor stress testing, enabling use in ADAS and body control modules

Pinout & Package

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 soldering.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential node; reverse-biased during regulation; must be routed with low-impedance path to ground or return
2	Not Connected (n.c.)	Internally unconnected; no PCB trace or solder pad required; must remain floating per design
3	Cathode (K)	Connected to higher-potential node; carries reverse current during regulation; serves as thermal path to PCB copper

Key Features

Feature	Design Value
Low Test Current Operation	Specified at 50 µA - enables stable regulation in µA-level bias circuits without loading sensitive sources
Optimized Leakage Profile	Intentional minor rise per AN90031 - reduces switching noise and improves transient response in feedback loops
Automotive Qualification	AEC-Q101 compliant - meets stress test requirements for temperature cycling, HTRB, and ESD robustness in vehicle ECUs
Thermal Performance	R_th(j-sp) = 330 K/W to cathode solder point - enables localized heat extraction via PCB copper pour under pin 3
Small-Signal Stability	Capacitance ≤160 pF at V_R = 0 V, f = 1 MHz - minimizes phase shift in high-frequency feedback networks

Applications

Automotive Body Control Module

Portable Sensor Node Biasing

Use Scenario: Providing stable 3.3 V reference for LIN transceiver bias and microcontroller I/O level-shifting in door module ECUs.

IC Role / Device Role / Timing Role: Shunt voltage regulator establishing fixed rail for analog front-end and communication ICs.

Use Value: Maintains regulation accuracy despite battery voltage swings (9–16 V) and engine cranking dips, enabled by AEC-Q101 reliability and low 50 µA operating point.

Use Scenario: Supplying precision bias current to MEMS accelerometer and temperature sensor in wireless IoT node.

IC Role / Device Role / Timing Role: Low-quiescent Zener reference setting operating point for op-amp signal conditioning stage.

Use Value: Draws only 50 µA while holding 3.3 V within ±5 %, extending coin-cell battery life beyond 5 years in sleep-mode dominant operation.

Industrial PLC Input Protection

USB-C Port Voltage Clamp

Use Scenario: Clamping transient overvoltage on 24 V digital input channel of programmable logic controller.

IC Role / Device Role / Timing Role: Fast-responding shunt clamp absorbing ESD and surge energy before reaching downstream logic.

Use Value: Leverages optimized leakage profile (AN90031) to suppress high-frequency noise induced by relay switching without oscillation.

Use Scenario: Protecting USB-C CC line receiver from VBUS coupling and hot-plug transients.

IC Role / Device Role / Timing Role: Low-capacitance (160 pF) Zener clamp referenced to 3.3 V logic rail.

Use Value: Prevents false CC detection while preserving signal integrity up to 1 MHz due to minimal parasitic capacitance and fast turn-on.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C3V3,115	Same 3.3 V/±5 % spec but non-AEC-Q101; 350 mW P_tot; higher r_diff (≤1200 Ω)	Approved for industrial/commercial use only; not qualified for automotive temperature cycling or humidity tests	Select when cost sensitivity outweighs automotive qualification and higher power margin is needed
MMSZ5226ET1G	3.3 V/±5 %, SOD-123 package; 500 mW rating; r_diff ≤100 Ω; no AEC-Q101 certification	Larger footprint (3.5 mm × 1.6 mm); higher thermal mass; unsuitable for space-constrained automotive modules	Choose for higher power handling in non-automotive designs where board area permits larger package

Compared with BZX8450-C3V3-QR, the BZX84-C3V3,115 offers higher power margin but lacks automotive qualification, while MMSZ5226ET1G provides superior regulation stiffness and power rating but sacrifices AEC-Q101 compliance and SOT23 compactness - making the BZX8450-C3V3-QR optimal for space-limited, automotive-grade 3.3 V reference needs.

Availability

BZX8450-C3V3-QR is available at Aetrix Electronics and suitable for automotive body control modules, portable sensor nodes, industrial PLC input stages, and USB-C interface protection requiring stable component supply, AEC-Q101 assurance, and SOT23 footprint compatibility.

Supply support for BZX8450-C3V3-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 consumer markets.

The BZX8450-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for low-current, low-noise voltage regulation in harsh-environment electronic control units and battery-sensitive portable systems.

FAQ

What is the maximum reverse current the BZX8450-C3V3-QR can sustain continuously?

The device sustains ≤200 mA forward current per limiting values, but as a Zener regulator, its continuous reverse current is constrained by power dissipation. At 3.3 V, max continuous I_Z = 250 mW / 3.3 V ≈ 75.8 mA at T_amb ≤ 25 °C on FR4 PCB. Derating applies above 25 °C per R_th(j-a) = 500 K/W.

Does the "QR" suffix indicate tape-and-reel packaging?

Yes - the "QR" suffix denotes that BZX8450-C3V3-QR is supplied in 3,000-unit tape-and-reel format compatible with automated SMT placement equipment, consistent with Nexperia's standard SOT23 ordering convention for automotive-grade parts.

Can this diode be used in series with another Zener for higher voltage regulation?

No - the BZX8450-C3V3-QR is not designed for series stacking. Its differential resistance (≤600 Ω) and tolerance stack-up would cause significant regulation error and thermal imbalance. Use a single higher-voltage Zener or active regulation for >3.3 V requirements.

Is the n.c. pin (pin 2) electrically isolated or internally bonded?

Pin 2 is fully unconnected - no internal bond wire or die connection exists. It is a mechanical stub for SOT23 symmetry and must remain unconnected on PCB; routing traces or solder to it violates the device's thermal and electrical specifications per Nexperia's package outline and pinning table.

BZX8450-C3V3-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):: 3.3 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 7.5 µA @ 1.5 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -55°C ~ 150°C (TA)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BZX8450-C3V3-QR FAQ

1.How can I place an order for BZX8450-C3V3-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-C3V3-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-C3V3-QR reliable?

The price and inventory of BZX8450-C3V3-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-C3V3-QR is usually 5 days.

3.What payment methods are accepted for BZX8450-C3V3-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C3V3-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-C3V3-QR?

BZX8450-C3V3-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-C3V3-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-C3V3-QR?

For technical support, including BZX8450-C3V3-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C3V3-QR requirements.

6.How does Aetrix verify that BZX8450-C3V3-QR is sourced from the original manufacturer or authorized distributors?

All BZX8450-C3V3-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-C3V3-QR meets industry standards.

7.What is the process for return or replacement of BZX8450-C3V3-QR?

All BZX8450-C3V3-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C3V3-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-C3V3-QR part is unused and in its original packaging.

Return procedure for BZX8450-C3V3-QR:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…