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

Nexperia USA Inc. BZX79-C20,143

Name: BZX79-C20,143
Brand: Nexperia USA Inc.
SKU: BZX79-C20,143
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-C20,143

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX79-C20,143.pdf

Description:: DIODE ZENER 20V 400MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:4,971

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Product details

Overview

BZX79-C20,143 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal 20 V breakdown voltage at 5 mA test current, 60 Ω typical differential resistance, and −12.3 mV/K temperature coefficient. It operates in low-power stabilization circuits requiring stable reference voltages under 500 mW dissipation in SOD27 (DO-35) glass packages.

For engineers reviewing the BZX79-C20,143 datasheet, BZX79-C20,143 pinout, BZX79-C20,143 application, or BZX79-C20,143 equivalent, this part serves as a cost-effective, through-hole voltage reference for analog signal conditioning, power supply feedback loops, and overvoltage protection where ±5% tolerance and 200 °C junction temperature capability are acceptable.

Technical Context

This Zener diode functions in reverse-biased breakdown mode to maintain a stable DC voltage across its terminals when reverse current exceeds the knee threshold. Its 20 V nominal Zener voltage is specified at I_Ztest = 5 mA, with 60 Ω typical dynamic impedance ensuring minimal voltage shift under load variation.

The device exhibits a negative temperature coefficient of −12.3 mV/K, meaning output voltage decreases with rising junction temperature - a critical factor in thermal design of precision references. It supports non-repetitive surge handling up to 40 W for 100 μs pulses, enabling transient suppression in low-energy clamping applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	19.6 V to 20.4 V at I_Z = 5 mA - defines stable regulation point for feedback or reference use
Differential Resistance r_dif	60 Ω typical - determines output voltage change per mA of current variation
Temperature Coefficient S_Z	−12.3 mV/K - quantifies voltage drift with temperature; requires thermal compensation in precision designs
Max Power Dissipation P_tot	500 mW at T_amb = 50 °C - sets continuous operating limit on PCB without heatsink
Reverse Current I_R	200 nA at V_R = 14 V - ensures low leakage in high-impedance bias networks
Package	SOD27 (DO-35) - hermetically sealed axial glass package with cathode band marking
Non-repetitive Peak Power	40 W for 100 μs - enables short-duration overvoltage clamping without failure

Pinout & Package

SOD27 (DO-35) is a hermetically sealed axial-lead glass package with cathode identified by a colored band. Leads are tinned and suitable for wave or hand soldering. Thermal resistance from junction to ambient is 380 K/W (unmounted, max lead length).

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-voltage side in Zener mode	Connected to lower potential node; carries forward current or sink current in regulation
Cathode	Reverse breakdown terminal / regulated voltage node	Marked with band; connected to input or supply rail; delivers stable 20 V reference to load

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables cost-sensitive designs where tighter regulation is unnecessary, e.g., non-critical biasing
500 mW total power rating	Supports continuous operation in compact PCB layouts without forced cooling
Hermetic SOD27 glass package	Ensures long-term reliability and moisture resistance in industrial environments
−12.3 mV/K tempco	Allows predictable voltage drift modeling for thermal compensation in analog circuits
40 W non-repetitive surge rating	Provides robustness against ESD and line transients in unregulated input stages

Applications

Power Supply Feedback

Analog Signal Clamping

Use Scenario: Regulating output voltage in linear power supplies using TL431 or discrete op-amp feedback.

IC Role / Device Role / Timing Role: Zener reference providing stable 20 V setpoint for error amplifier comparison.

Use Value: Maintains ±5% output accuracy across load and line variations without active regulation overhead.

Use Scenario: Limiting analog sensor output swing to prevent ADC saturation or op-amp rail-to-rail overload.

IC Role / Device Role / Timing Role: Passive clamp element shunting excess voltage above 20 V to ground.

Use Value: Prevents damage to downstream circuitry during transient overvoltage events with sub-μs response.

Voltage Reference for MCU Peripherals

Overvoltage Protection in Battery Monitoring

Use Scenario: Providing stable reference to ADC or comparator inputs in microcontroller-based measurement systems.

IC Role / Device Role / Timing Role: Low-drift DC reference source for analog front-end calibration.

Use Value: Enables repeatable 10-bit ADC readings despite ambient temperature shifts up to 85 °C.

Use Scenario: Protecting battery management IC inputs from cell stack overvoltage during charging faults.

IC Role / Device Role / Timing Role: Crowbar element triggering shutdown when sensed voltage exceeds 20 V threshold.

Use Value: Delivers fail-safe cutoff before lithium-ion cell damage occurs at >4.2 V/cell × 5 cells.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4742A	20 V ±5%, 1 W rating, DO-41 package	Higher power handling but larger footprint and higher thermal resistance	Select when >500 mW continuous dissipation is required or board space permits larger package
BZX79-B20,113	20 V ±2%, same SOD27 package, lower tempco (−10.4 mV/K)	Tighter regulation and improved thermal stability for precision references	Select when system-level accuracy demands <±2% tolerance or reduced temperature drift

Compared with 1N4742A and BZX79-B20,113, the BZX79-C20,143 offers optimal balance of cost, size, and performance for general-purpose 20 V referencing where ±5% tolerance and SOD27 compatibility are prioritized over power headroom or precision.

Availability

BZX79-C20,143 is available at Aetrix Electronics and suitable for power supply feedback, analog signal clamping, voltage reference for MCU peripherals, and overvoltage protection in battery monitoring requiring stable component supply and long-lifecycle support.

Supply support for BZX79-C20,143 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, formed in 2017 from the former NXP Standard Products division.

The BZX79 series belongs to Nexperia's voltage regulator diode product line, designed specifically for low-power stabilization and reference applications in automotive, industrial, and consumer electronics.

FAQ

What is the maximum continuous reverse current for BZX79-C20,143 at 25 °C?

The device does not specify a maximum continuous reverse current; instead, it defines maximum power dissipation (500 mW at T_amb = 50 °C). At 20 V Zener voltage, this corresponds to ~25 mA continuous reverse current under ideal thermal conditions. Derating is required above 50 °C ambient.

Can BZX79-C20,143 be used in surface-mount designs?

No - BZX79-C20,143 uses the axial-leaded SOD27 (DO-35) glass package and is not compatible with SMT assembly. For surface-mount equivalents, consider Nexperia's MMBZ5242B (SOT-23, 20 V, ±5%) or PZM20A (SOT-323, 20 V, ±5%).

How does the −12.3 mV/K temperature coefficient affect circuit accuracy?

A −12.3 mV/K coefficient means the Zener voltage drops ~12.3 mV per Kelvin rise in junction temperature. Over a 50 °C rise (e.g., from 25 °C to 75 °C), voltage shifts ~0.615 V - a 3.1% change relative to 20 V. This must be compensated or accommodated in precision reference designs.

Is BZX79-C20,143 RoHS compliant and halogen-free?

Yes - Nexperia confirms BZX79-C20,143 meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The SOD27 package contains no lead in the glass or internal structure, and all materials comply with Nexperia's Eco Policy.

BZX79-C20,143 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):: 20 V

Tolerance:: ±5%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 55 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 14 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-C20,143 FAQ

1.How can I place an order for BZX79-C20,143 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-C20,143 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-C20,143 reliable?

The price and inventory of BZX79-C20,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C20,143 is usually 5 days.

3.What payment methods are accepted for BZX79-C20,143?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C20,143 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-C20,143?

BZX79-C20,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-C20,143 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-C20,143?

For technical support, including BZX79-C20,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C20,143 requirements.

6.How does Aetrix verify that BZX79-C20,143 is sourced from the original manufacturer or authorized distributors?

All BZX79-C20,143 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-C20,143 meets industry standards.

7.What is the process for return or replacement of BZX79-C20,143?

All BZX79-C20,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C20,143, 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-C20,143 part is unused and in its original packaging.

Return procedure for BZX79-C20,143:

1.Submit a request within 90 days.

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

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