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

Nexperia USA Inc. BZX79-B22,143

Name: BZX79-B22,143
Brand: Nexperia USA Inc.
SKU: BZX79-B22,143
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-B22,143

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: BZX79-B22,143.pdf

Description:: DIODE ZENER 22V 400MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:4,990

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Product details

Overview

BZX79-B22,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal 22 V regulation at 5 mA test current, 60 Ω typical differential resistance, and −20 mV/K temperature coefficient. It operates in low-power stabilization circuits requiring precise reference voltage under 500 mW total dissipation in SOD27 (DO-35) glass package, commonly used in power supply feedback loops and analog sensor biasing.

For engineers reviewing the BZX79-B22,143 datasheet, BZX79-B22,143 pinout, BZX79-B22,143 application, or BZX79-B22,143 equivalent, this page delivers verified electrical parameters, thermal behavior, junction-to-ambient thermal resistance (380 K/W), and real-world use cases for voltage reference design, overvoltage protection, and analog signal conditioning.

Technical Context

This Zener diode functions as a two-terminal shunt voltage reference, maintaining stable reverse breakdown voltage across varying load currents. Its 22 V nominal Zener voltage is specified at I_Ztest = 5 mA, with differential resistance of ≤250 Ω (max) and temperature coefficient of −20 mV/K (typical), indicating negative drift with rising temperature.

Designed for operation up to +200 °C junction temperature, it supports non-repetitive surge handling up to 60 W for 100 μs pulses and exhibits 1.25 A peak reverse current rating under those conditions. The device uses axial-leaded hermetically sealed glass construction for long-term stability and low leakage (≤100 nA at 15.4 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	21.6 V to 22.4 V at I_Z = 5 mA - ensures tight regulation window for precision reference applications
Differential Resistance r_dif	60 Ω (typ), ≤250 Ω (max) - determines output impedance and load regulation sensitivity
Temperature Coefficient S_Z	−20 mV/K (typ) - quantifies voltage drift per degree Celsius rise in junction temperature
Max Power Dissipation P_tot	500 mW at T_amb = 50 °C - defines continuous DC power handling on standard PCB mounting
Reverse Leakage I_R	≤100 nA at V_R = 15.4 V - critical for low-current bias networks and high-impedance references
Non-repetitive Peak Current I_ZSM	1.25 A for t_p = 100 μs - enables transient overvoltage clamping without damage
Junction-to-Ambient R_{th j-a}	380 K/W - establishes thermal derating curve for ambient temperature operation

Pinout & Package

Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a colored band. No active pin configuration-two-terminal device with anode and cathode leads.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (banded end)	Reverse-biased terminal during regulation	Connected to higher potential node; carries reverse current during Zener conduction
Anode (unbanded end)	Reference/ground return path	Typically tied to circuit ground or common reference plane; completes current loop

Key Features

Feature	Design Value
±2% Zener voltage tolerance	Enables direct replacement in precision reference designs without recalibration
Hermetic glass SOD27 package	Provides long-term parameter stability and moisture resistance for industrial environments
Low 100 nA max reverse leakage at 70% V_Z	Minimizes error in high-impedance voltage divider and sensor bias networks
60 Ω typical dynamic impedance	Reduces output voltage variation under changing load current in feedback paths
−20 mV/K tempco at 5 mA	Allows predictable compensation in temperature-sensitive analog circuits

Applications

Power Supply Feedback

Sensor Bias Reference

Use Scenario: Regulating output voltage in linear regulators and switch-mode power supply feedback networks.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 22 V threshold for optocoupler or error amplifier input.

Use Value: Maintains ±0.4 V regulation window across temperature and line variations, ensuring <1% output deviation.

Use Scenario: Providing stable bias voltage for analog pressure or temperature sensors operating near 22 V rails.

IC Role / Device Role / Timing Role: Precision reference source for ratiometric sensor excitation and ADC reference scaling.

Use Value: Enables 12-bit measurement accuracy by limiting reference drift to <0.1% over −40 °C to +85 °C.

Overvoltage Clamp

Analog Signal Conditioning

Use Scenario: Protecting downstream IC inputs from transient surges exceeding 22 V in industrial control I/O modules.

IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing energy during ESD or inductive kick events.

Use Value: Limits clamped voltage to ≤24 V with 1.25 A peak surge capability, preventing latch-up in 24 V logic interfaces.

Use Scenario: Level-shifting and clipping analog signals in audio preamplifiers and instrumentation front-ends.

IC Role / Device Role / Timing Role: Symmetric clipping element defining upper rail limit in bipolar signal paths.

Use Value: Provides repeatable 22 V clipping threshold with <50 mV hysteresis, preserving waveform fidelity below threshold.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5247B,215	22 V ±5%, SOT-23 package, 200 mW P_tot, 30 Ω r_dif	Surface-mount only; lower power rating limits use in through-hole legacy designs	Select when board space is constrained and thermal management allows lower dissipation
1N4748A	22 V ±5%, DO-41 package, 1 W P_tot, 23 Ω r_dif, higher leakage (1 μA)	Larger footprint and higher power capacity; less precise tolerance affects calibration-critical systems	Choose for higher surge robustness where ±5% tolerance is acceptable in cost-sensitive consumer designs

Compared with MMBZ5247B,215 and 1N4748A, BZX79-B22,143 offers tighter ±2% tolerance and hermetic glass reliability ideal for industrial calibration, while balancing power (500 mW), impedance (60 Ω), and leakage (100 nA) for analog reference integrity.

Availability

BZX79-B22,143 is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and analog signal conditioning circuits requiring stable component supply with long-lifecycle support.

Supply support for BZX79-B22,143 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 leader in discrete, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, and consumer markets with high-reliability components.

The BZX79 series belongs to Nexperia's precision Zener voltage regulator portfolio, engineered for stable low-power voltage referencing in harsh environments and long-life equipment.

FAQ

What is the maximum continuous power dissipation for BZX79-B22,143?

The BZX79-B22,143 has a maximum total power dissipation of 500 mW at ambient temperature of 50 °C with standard PCB mounting (lead length ≤8 mm). Derating is required above 50 °C at 4.2 mW/°C based on its 380 K/W junction-to-ambient thermal resistance.

How does the temperature coefficient affect regulation accuracy?

With a typical temperature coefficient of −20 mV/K, the BZX79-B22,143's Zener voltage decreases by approximately 20 mV per Kelvin rise in junction temperature. At 85 °C junction temperature, this results in ~1.2 V drop from nominal 22 V, requiring thermal design consideration in high-ambient applications.

Can BZX79-B22,143 be used in surface-mount designs?

No - BZX79-B22,143 uses the axial-leaded SOD27 (DO-35) glass package and is not compatible with surface-mount assembly. For SMT alternatives, consider MMBZ5247B,215 (SOT-23) or BZX84-C22 (SOT-23), which differ in tolerance, power rating, and thermal performance.

What is the reverse leakage current at 15.4 V?

At V_R = 15.4 V (70% of nominal 22 V), the maximum reverse leakage current is 100 nA, measured at T_j = 25 °C. This low leakage supports high-impedance bias networks and minimizes error in precision voltage divider configurations.

BZX79-B22,143 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: DO-204AH, DO-35, Axial

Packaging:: Cut Tape (CT)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 22 V

Tolerance:: ±2%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 55 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 15.4 V

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

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: ALF2

BZX79-B22,143 FAQ

1.How can I place an order for BZX79-B22,143 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-B22,143 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 BZX79-B22,143 reliable?

The price and inventory of BZX79-B22,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B22,143 is usually 5 days.

3.What payment methods are accepted for BZX79-B22,143?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B22,143 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-B22,143?

BZX79-B22,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-B22,143 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 BZX79-B22,143?

For technical support, including BZX79-B22,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B22,143 requirements.

6.How does Aetrix verify that BZX79-B22,143 is sourced from the original manufacturer or authorized distributors?

All BZX79-B22,143 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 BZX79-B22,143 meets industry standards.

7.What is the process for return or replacement of BZX79-B22,143?

All BZX79-B22,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B22,143, 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 BZX79-B22,143 part is unused and in its original packaging.

Return procedure for BZX79-B22,143:

1.Submit a request within 90 days.

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

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