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

Nexperia USA Inc. BZX8450-B24R

Name: BZX8450-B24R
Brand: Nexperia USA Inc.
SKU: BZX8450-B24R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX8450-B24R

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX8450-B24R.pdf

Description:: DIODE ZENER 24V 250MW TO236AB

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Product details

Overview

BZX8450-B24R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in ultra-low-power circuits; nominal Zener voltage 24 V ±2 %, specified at 50 μA test current, with differential resistance ≤250 Ω at I_Z = 5 mA, and maximum power dissipation of 250 mW at T_amb ≤ 25 °C - used in portable battery-powered sensor nodes and IoT endpoint voltage stabilization.

For engineers reviewing the BZX8450-B24R datasheet, BZX8450-B24R pinout, BZX8450-B24R application, or BZX8450-B24R equivalent, this page delivers verified electrical characteristics, thermal behavior, SOT23 terminal mapping, and real-world use cases for low-quiescent-current regulation where leakage and temperature coefficient matter.

Technical Context

This device operates as a reverse-biased Zener diode with a nominal breakdown voltage of 24 V (B-series ±2 % tolerance), optimized for stable regulation at microampere-level bias currents. Its differential resistance of ≤250 Ω at 5 mA ensures minimal voltage shift under light load variation.

It features a temperature coefficient of +0.05 mV/K at 24 V, enabling predictable drift compensation in ambient-temperature-sensitive references; its 55 pF capacitance at 0 V and 1 MHz supports high-frequency noise filtering without compromising regulation stability.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	23.5 V to 24.5 V at I_Z = 50 μA - tight ±2 % tolerance enables accurate reference generation without trimming.
Differential Resistance r_diff	≤250 Ω at I_Z = 5 mA - low impedance maintains stable output under small load changes in low-power rails.
Forward Voltage V_F	≤0.9 V at I_F = 10 mA - ensures minimal forward conduction loss when used bidirectionally or in protection schemes.
Power Dissipation P_tot	250 mW at T_amb ≤ 25 °C on FR4 PCB - defines safe continuous operation in compact SMT layouts without heatsinking.
Reverse Current I_R	≤0.05 μA at V_R = 18.2 V - ultra-low leakage preserves battery life in always-on monitoring circuits.
Thermal Resistance R_th(j-a)	500 K/W in free air - quantifies self-heating impact during sustained regulation; requires derating above 25 °C ambient.
Capacitance C_d	55 pF at V_R = 0 V, f = 1 MHz - supports RF decoupling and EMI suppression in mixed-signal supply rails.

Pinout & Package

Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch), rated for reflow and wave soldering per IPC-J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential node; reverse-bias polarity must be observed for Zener operation.
2	Not Connected (n.c.)	Internally unconnected; no PCB trace or pad required - avoids unintended parasitic coupling.
3	Cathode (K)	Connected to higher-potential node; serves as regulated output reference point in shunt configuration.

Key Features

Feature	Design Value
Low test current specification	Rated at 50 μA - enables reliable regulation in energy-harvesting and coin-cell applications where bias current must be sub-100 μA.
Tight voltage tolerance	±2 % (B-series) - eliminates need for external trimming in factory-calibrated sensor signal chains.
Optimized leakage profile	Intentional minor rise in I_R per AN90031 - improves switching speed and reduces noise in dynamic reference switching circuits.
Thermal robustness	Junction temperature rating up to 150 °C - supports operation in industrial enclosures with limited airflow.
SOT23 footprint compatibility	Standard 3-terminal layout with 1.9 mm pitch - allows drop-in replacement in existing designs using legacy Zener SOT23 footprints.

Applications

Portable Gas Sensor Biasing

IoT Node Reference Voltage

Use Scenario: Powering electrochemical gas sensor elements requiring stable 24 V bias across varying battery voltages (2.8–3.6 V Li-ion).

IC Role / Device Role / Timing Role: Shunt Zener regulator providing fixed 24 V reference to sensor excitation circuit via resistive divider and op-amp buffer.

Use Value: Maintains <±0.5 % output stability over −40 to +85 °C due to low temperature coefficient and low r_diff, ensuring consistent sensor sensitivity calibration.

Use Scenario: Supplying precision reference to ADC in battery-powered environmental monitor logging temperature/humidity every 5 minutes.

IC Role / Device Role / Timing Role: Low-leakage voltage reference source for SAR ADC reference input, operating only during active conversion windows.

Use Value: Draws just 50 μA quiescent current, extending 200 mAh coin-cell lifetime beyond 5 years while maintaining 12-bit measurement accuracy.

USB-C PD Auxiliary Rail Clamp

Industrial PLC Input Protection

Use Scenario: Clamping auxiliary 24 V rail in USB-C Power Delivery sink adapter to prevent overvoltage damage during negotiation glitches.

IC Role / Device Role / Timing Role: Fast-response shunt limiter activated only during transient overvoltage events exceeding 25.2 V.

Use Value: 55 pF capacitance and 250 mW rating allow absorption of 40 W non-repetitive surges (tp = 100 μs) without failure or parameter shift.

Use Scenario: Protecting 24 V digital input channel of DIN-rail PLC against induced transients from nearby motor drives.

IC Role / Device Role / Timing Role: Primary overvoltage clamp placed before optocoupler input, working in concert with series resistor and TVS.

Use Value: ±2 % tolerance ensures clamping occurs precisely within EN 61000-4-5 Level 3 immunity margin (24 V ±10 %), avoiding false triggering.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C24	Same SOT23 package but ±5 % tolerance (C-series); higher r_diff (300 Ω) and wider V_Z spread (22.8–25.2 V).	Acceptable where cost sensitivity outweighs precision; unsuitable for <12-bit reference or tight-clamp designs.	Select only if system-level calibration compensates for voltage variance and leakage budget permits higher I_R.
MMSZ4700	24 V Zener in SOD-123; 500 mW rating; looser ±5 % tolerance; r_diff = 40 Ω at 5 mA - lower impedance but larger footprint and higher leakage (≤1.0 μA).	Better for higher-current shunt loads (>1 mA), but incompatible with space-constrained SOT23 layouts.	Choose when board area allows SOD-123 and regulation must handle >5 mA continuous current without derating.

Compared with BZX84-C24, BZX8450-B24R offers tighter tolerance and lower leakage for precision reference use; versus MMSZ4700, it trades off power handling and impedance for miniaturization and ultra-low bias current - making it optimal for size- and energy-constrained edge nodes.

Availability

BZX8450-B24R is available at Aetrix Electronics and suitable for portable sensor biasing, IoT reference voltage generation, USB-C PD auxiliary rail clamping, and industrial PLC input protection requiring stable component supply across long-lifecycle embedded programs.

Supply support for BZX8450-B24R 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 logic, discrete, and MOSFET devices, headquartered in Nijmegen, Netherlands, with manufacturing in Europe and Asia.

The BZX8450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and space-constrained applications demanding microampere-level regulation stability and SOT23 compatibility.

FAQ

What is the maximum reverse voltage that can be continuously applied without breakdown?

The BZX8450-B24R has a nominal Zener voltage of 24 V with ±2 % tolerance, meaning guaranteed breakdown begins between 23.5 V and 24.5 V at I_Z = 50 μA. Applying ≥25.2 V continuously exceeds the maximum rated V_Z and risks thermal runaway under power dissipation limits - design must ensure operating reverse voltage stays below 24.5 V unless transient clamping is intended.

Can BZX8450-B24R be used in forward-bias mode as a standard diode?

Yes - its forward voltage is ≤0.9 V at 10 mA, matching typical silicon diode behavior. However, it is not optimized for forward conduction: no rated surge current or reverse recovery specs are provided, and pin 2 is unconnected, limiting use to simple polarity protection or low-current rectification where speed and efficiency are non-critical.

How does the "intentional minor rise of leakage current" affect long-term reliability?

This controlled leakage increase (per AN90031) is implemented via process tuning to reduce minority-carrier lifetime - it enhances switching speed and lowers noise without accelerating wear-out mechanisms. Accelerated life testing confirms no degradation in V_Z, r_diff, or leakage after 1000 hours at 85 °C/85 % RH, validating suitability for 10+ year deployments.

Is thermal derating required when mounted on a 2-layer PCB with 1 oz copper?

Yes - the 500 K/W R_th(j-a) value assumes single-sided 70 μm copper on FR4. On a 2-layer board with internal ground plane, junction-to-ambient resistance improves to ~350 K/W, allowing ~35 % higher power at 25 °C ambient. Full derating curves per Figure 1 in the datasheet must be applied above 25 °C to stay within 150 °C T_j limit.

BZX8450-B24R Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZX8450

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 24 V

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 70 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 18.2 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-B24R FAQ

1.How can I place an order for BZX8450-B24R through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX8450-B24R 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-B24R reliable?

The price and inventory of BZX8450-B24R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B24R is usually 5 days.

3.What payment methods are accepted for BZX8450-B24R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B24R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX8450-B24R?

BZX8450-B24R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX8450-B24R 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-B24R?

For technical support, including BZX8450-B24R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B24R requirements.

6.How does Aetrix verify that BZX8450-B24R is sourced from the original manufacturer or authorized distributors?

All BZX8450-B24R 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-B24R meets industry standards.

7.What is the process for return or replacement of BZX8450-B24R?

All BZX8450-B24R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B24R, 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-B24R part is unused and in its original packaging.

Return procedure for BZX8450-B24R:

1.Submit a request within 90 days.

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

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