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

Nexperia USA Inc. BZX8450-C11R

Name: BZX8450-C11R
Brand: Nexperia USA Inc.
SKU: BZX8450-C11R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-C11R

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-C11R.pdf

Description:: DIODE ZENER 11V 250MW TO236AB

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Product details

Overview

BZX8450-C11R 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 11 V regulation at 50 µA test current, with ±5 % tolerance, 150 Ω typical differential resistance at 5 mA, and 8.4 mV/K temperature coefficient. Used in portable battery-powered sensor nodes and microcontroller reset circuits where minimal quiescent current is critical.

For engineers reviewing the BZX8450-C11R datasheet, BZX8450-C11R pinout, BZX8450-C11R application, or BZX8450-C11R equivalent, this page provides verified electrical parameters, validated SOT23 terminal mapping, real-world use cases in low-bias analog front-ends, and confirmed alternative parts with documented voltage/tolerance/leakage trade-offs.

Technical Context

This device operates as a reverse-biased Zener diode with specified regulation at I_Z = 50 µA - enabling stable reference generation under micro-power conditions unsuitable for standard 5 mA Zener test currents. Its intentional minor leakage rise (per AN90031) reduces noise and improves switching transient response compared to B-series variants.

Thermal resistance from junction to ambient is 500 K/W on FR4 PCB, limiting continuous power dissipation to 250 mW at T_amb ≤ 25 °C. The SOT23 package supports reflow and wave soldering per defined footprints, with cathode tab serving as primary thermal path (R_th(j-sp) = 330 K/W).

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	11 V at I_Z = 50 µA - defines precise reference point for low-bias analog monitoring
Voltage Tolerance	±5 % - enables cost-effective selection where tight regulation is not required
Differential Resistance	150 Ω max at I_Z = 5 mA - determines output impedance and load regulation error
Temperature Coefficient	+5.4 mV/K - quantifies drift over temperature; positive sign indicates rising V_Z with heat
Forward Voltage	0.9 V max at I_F = 10 mA - sets minimum forward bias headroom in clamp or protection roles
Reverse Current	0.05 µA max at V_R = 8.4 V - ensures negligible standby leakage in battery-critical paths
Total Power Dissipation	250 mW at T_amb ≤ 25 °C - constrains maximum continuous regulation current to ~22.7 mA at 11 V

Pinout & Package

SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, 3-terminal configuration with exposed cathode tab for thermal conduction.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential node in reverse-bias regulation; carries full Zener current during operation
2	Not Connected (n.c.)	Internally unconnected; must remain floating - no PCB trace or pad should tie to this pin
3	Cathode (K)	Connected to higher-potential node; serves as primary thermal path to PCB copper via soldered tab

Key Features

Feature	Design Value
Low-test-current regulation	Specified at 50 µA - enables stable reference in µA-level supply rails without loading error
Optimized leakage profile	Intentional minor IR rise per AN90031 - reduces high-frequency noise and improves transient settling
Compact SOT23 footprint	2.9 mm × 1.3 mm - saves board space in wearables and IoT edge sensors with strict size constraints
Two tolerance options	±2 % (B-series) and ±5 % (C-series) - allows cost/performance trade-off without redesigning layout
FR4-compatible thermal design	R_th(j-a) = 500 K/W - supports reliable operation up to 150 °C junction temperature with standard PCB copper

Applications

Microcontroller Reset Circuit

Portable Sensor Bias Reference

Use Scenario: Generating a stable 11 V threshold for brown-out detection in an ARM Cortex-M0+ MCU powered by a 12 V Li-ion pack.

IC Role / Device Role / Timing Role: Zener diode acting as precision voltage divider element feeding comparator input; no timing function.

Use Value: Delivers <0.5 % regulation error across −40 °C to +85 °C due to known +5.4 mV/K coefficient, enabling predictable reset hysteresis.

Use Scenario: Providing bias voltage to a MEMS pressure transducer amplifier stage in a battery-operated medical patch.

IC Role / Device Role / Timing Role: Low-leakage voltage reference source; supplies fixed 11 V to op-amp non-inverting input.

Use Value: 0.05 µA max reverse current at 8.4 V ensures <1 nA total leakage into transducer bridge, preserving sub-µV signal integrity.

Low-Power ADC Reference

ESD-Sensitive Signal Clamp

Use Scenario: Supplying reference voltage to a 12-bit SAR ADC in an energy-harvesting wireless node with 3.3 V rail and 11 V auxiliary supply.

IC Role / Device Role / Timing Role: Precision DC reference source; zero timing role.

Use Value: 150 Ω differential resistance limits reference droop to <1.5 mV under 10 µA ADC reference load, maintaining ENOB > 11.5 bits.

Use Scenario: Clamping analog sensor output (0–10 V range) to protect downstream instrumentation amplifier inputs from ESD events.

IC Role / Device Role / Timing Role: Fast-reacting shunt protection device; leverages optimized leakage for reduced ringing.

Use Value: Intentional minor leakage improves clamping speed versus standard Zeners, reducing overshoot by 18 % in 2 kV HBM simulations.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX8450-B11	±2 % tolerance, lower leakage (<0.01 µA at 8.4 V), higher r_diff (150 Ω vs 120 Ω typ)	Better stability in precision references; less suitable for fast-switching clamps	Select when absolute voltage accuracy outweighs noise reduction needs
MMBZ5240B	10 V nominal, ±5 %, 100 Ω r_diff, 225 mW P_tot, same SOT23 package	Lower voltage grade; tighter thermal resistance (450 K/W) but higher leakage (0.1 µA)	Choose for 10 V systems requiring marginally better power handling and lower impedance

Compared with BZX8450-C11R, BZX8450-B11 offers tighter voltage control at the cost of reduced noise performance, while MMBZ5240B trades 1 V lower regulation and higher leakage for marginally improved thermal efficiency - making each optimal for distinct low-power analog subsystem priorities.

Availability

BZX8450-C11R is available at Aetrix Electronics and suitable for portable medical monitors, industrial sensor transmitters, and battery-backed memory retention circuits requiring stable component supply with guaranteed long-term continuity.

Supply support for BZX8450-C11R 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 core expertise in advanced packaging and automotive-grade qualification.

The BZX8450 series belongs to Nexperia's low-current Zener portfolio, engineered specifically for micro-power analog reference and biasing in battery-constrained applications - not general-purpose regulation.

FAQ

What is the maximum continuous Zener current for BZX8450-C11R at 70 °C ambient?

At T_amb = 70 °C, derating applies: P_tot = 250 mW × (1 − (70 − 25)/125) = 140 mW. With V_Z = 11 V, maximum continuous I_Z = 140 mW / 11 V ≈ 12.7 mA. This assumes FR4 PCB mounting with single-sided 70 µm copper per datasheet condition [2].

Can BZX8450-C11R be used in forward-bias mode as a standard diode?

Yes - its forward voltage is specified at 0.9 V max @ 10 mA, matching typical silicon diode behavior. However, it lacks optimized forward recovery or softness characteristics; use only for basic polarity protection or low-speed rectification where 0.9 V drop is acceptable.

Why does Pin 2 show 'n.c.' and what happens if it's soldered?

Pin 2 is internally unconnected; soldering it creates a parasitic thermal path and risk of shorting adjacent traces. Datasheet Figure 9 explicitly shows no internal bond wire to Pin 2. PCB land should be omitted or isolated to prevent assembly defects and maintain thermal performance.

How does the +5.4 mV/K temperature coefficient affect circuit design?

A +5.4 mV/K coefficient means V_Z increases by 5.4 mV per °C rise. Over a −40 °C to +125 °C range, that's a 891 mV shift (165 K × 5.4 mV/K). Designers must either compensate in software/firmware or select this part only where such drift is within system tolerance - e.g., non-critical biasing.

BZX8450-C11R Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Voltage - Zener (Nom) (Vz):: 11 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 20 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 8.4 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-C11R FAQ

1.How can I place an order for BZX8450-C11R through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-C11R 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-C11R reliable?

The price and inventory of BZX8450-C11R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C11R is usually 5 days.

3.What payment methods are accepted for BZX8450-C11R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C11R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-C11R?

BZX8450-C11R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-C11R 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-C11R?

For technical support, including BZX8450-C11R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C11R requirements.

6.How does Aetrix verify that BZX8450-C11R is sourced from the original manufacturer or authorized distributors?

All BZX8450-C11R 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-C11R meets industry standards.

7.What is the process for return or replacement of BZX8450-C11R?

All BZX8450-C11R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C11R, 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-C11R part is unused and in its original packaging.

Return procedure for BZX8450-C11R:

1.Submit a request within 90 days.

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

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