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

Nexperia USA Inc. BZX79-C43,143

Name: BZX79-C43,143
Brand: Nexperia USA Inc.
SKU: BZX79-C43,143
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-C43,143

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX79-C43,143.pdf

Description:: DIODE ZENER 43V 400MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:70,000

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Product details

Overview

BZX79-C43,143 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal working voltage 43 V at 2 mA test current, 85 Ω typical differential resistance, and −3.5 to −1.6 mV/K temperature coefficient. It operates as a low-power voltage reference in bias networks and analog signal conditioning circuits, delivering stable regulation under 500 mW total power dissipation in SOD27 (DO-35) glass package.

For engineers reviewing the BZX79-C43,143 datasheet, BZX79-C43,143 pinout, BZX79-C43,143 application, or BZX79-C43,143 equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance at specified test current, thermal resistance (380 K/W junction-to-ambient), reverse leakage at defined VR, and non-repetitive surge capability (40 W, 100 μs).

Technical Context

This Zener diode functions in reverse-biased breakdown mode, maintaining a stable reference voltage across its terminals when reverse current exceeds the knee threshold. Its operation relies on controlled avalanche breakdown for voltages above ~6 V, with temperature coefficient shaped by doping profile and junction geometry.

Designed for DC voltage stabilization and precision reference generation, it requires external current limiting and exhibits predictable rdif variation with IZtest - 85 Ω typical at 2 mA per Table 2, rising significantly below 1 mA. Junction temperature must remain within −65 °C to +200 °C for reliable long-term performance.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	42.1–43.9 V at I_Z = 2 mA; defines stable regulation point for reference design
Differential Resistance r_dif	85 Ω typical at I_Z = 2 mA; determines output impedance and load regulation error
Temperature Coefficient S_Z	−3.5 to −1.6 mV/K at I_Z = 2 mA; quantifies voltage drift over operating temperature range
Total Power Dissipation P_tot	500 mW at T_amb = 50 °C; sets maximum continuous DC power handling under standard PCB mounting
Non-repetitive Peak Power P_ZSM	40 W for 100 μs square wave; enables transient overvoltage clamping without failure
Reverse Leakage I_R	≤50 nA at V_R = 0.7×V_Znom = 30.1 V; ensures minimal quiescent current in high-impedance bias networks
Junction-to-Ambient R_{th j-a}	380 K/W; defines thermal rise per watt under standard lead-length mounting conditions

Pinout & Package

Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a colored band. Dimensions: D = 1.85 mm max., L = 25.4 mm min., b = 0.56 mm max., G1 = 4.25 mm max.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-voltage reference node	Connected to circuit ground or lower-potential rail during Zener operation
Cathode	Reverse breakdown terminal / regulated voltage output node	Marked with band; delivers stable 43 V reference when reverse-biased via series resistor

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables cost-effective voltage referencing where tight regulation is not required
40 W non-repetitive peak power rating	Supports transient suppression in low-energy surge environments without derating
380 K/W junction-to-ambient thermal resistance	Allows direct PCB mounting without heatsinking for ≤130 mW continuous dissipation
Low 50 nA reverse leakage at 30.1 V	Minimizes error in high-impedance reference dividers and sensor biasing networks
Hermetic glass SOD27 package	Ensures long-term reliability and moisture resistance in industrial ambient conditions

Applications

Power Supply Reference

Overvoltage Protection

Use Scenario: Providing stable 43 V reference for feedback loop in linear regulator or switching converter.

IC Role / Device Role / Timing Role: Zener diode acting as precision voltage clamp and reference node.

Use Value: Maintains output regulation accuracy within ±5% despite input ripple and load variation.

Use Scenario: Clamping transient spikes on 36 V automotive subsystem rails.

IC Role / Device Role / Timing Role: Passive overvoltage limiter absorbing short-duration surges.

Use Value: Limits voltage to ≤46 V during 100 μs transients, protecting downstream logic and sensors.

Sensor Bias Network

Analog Signal Conditioning

Use Scenario: Biasing bridge-based pressure sensor requiring stable excitation voltage.

IC Role / Device Role / Timing Role: Low-drift voltage reference source for Wheatstone bridge excitation.

Use Value: Delivers <50 nA leakage and <85 Ω dynamic impedance to minimize offset and gain errors.

Use Scenario: Level-shifting and clamping analog signals in data acquisition front-end.

IC Role / Device Role / Timing Role: Signal limiter defining upper rail for op-amp input protection.

Use Value: Prevents op-amp saturation by clamping input to 43 V ±5%, preserving linearity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4749A	43 V ±5%, 1 W rating, DO-41 package, 100 Ω r_dif at 23 mA	Higher power handling but larger footprint and higher test current	Select when >500 mW continuous dissipation or higher surge energy is required
BZX85-C43	43 V ±5%, 1.3 W rating, DO-41 package, 100 Ω r_dif at 45 mA	Higher power, higher test current, different thermal profile	Choose for legacy designs requiring higher surge margin and board-level heat spreading

Compared with BZX79-C43,143, the 1N4749A offers higher power but requires larger layout space and higher bias current, while BZX85-C43 trades compact SOD27 size for greater thermal mass and higher surge endurance - both demand revised current-limiting resistor values due to differing I_Ztest.

Availability

BZX79-C43,143 is available at Aetrix Electronics and suitable for voltage reference design, analog signal clamping, sensor biasing, and low-energy overvoltage protection requiring stable component supply and long-term parametric consistency.

Supply support for BZX79-C43,143 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 semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, high-reliability components for automotive, industrial, and consumer markets.

The BZX79 series belongs to Nexperia's Zener diode product line, engineered for cost-sensitive, low-power voltage regulation and reference applications where ±2% or ±5% tolerance meets system requirements without premium packaging.

FAQ

What is the recommended test current for measuring V_Z of BZX79-C43,143?

The datasheet specifies 2 mA as the standard test current for V_Z measurement. This value is used in Table 2 for all BZX79-C types ≥27 V, including BZX79-C43,143. Operating at this current ensures consistent characterization of Zener voltage and differential resistance under defined thermal conditions.

Can BZX79-C43,143 be used in surface-mount designs?

No - BZX79-C43,143 uses an axial-leaded SOD27 (DO-35) glass package designed exclusively for through-hole mounting. For surface-mount equivalents, consider Nexperia's PZMxx series or ON Semiconductor's MMBZ43VCLT1G, which offer comparable 43 V Zener characteristics in SOT-23 packages.

How does temperature affect the Zener voltage of BZX79-C43,143?

Its temperature coefficient ranges from −3.5 to −1.6 mV/K at I_Z = 2 mA, indicating negative drift: voltage decreases as junction temperature rises. This behavior is typical for Zeners in the 40–50 V range and must be factored into reference stability calculations over −65 °C to +150 °C operating range.

Is derating required for operation above 50 °C ambient temperature?

Yes - total power dissipation must be linearly derated above 50 °C ambient. With R_{th j-a} = 380 K/W, each 1 °C rise reduces allowable P_tot by 1.32 mW. At 70 °C ambient, maximum continuous dissipation drops to 473 mW to maintain T_j ≤ 200 °C.

BZX79-C43,143 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Bulk

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 43 V

Tolerance:: ±5%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 150 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 700 mV

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-C43,143 FAQ

1.How can I place an order for BZX79-C43,143 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-C43,143 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-C43,143 reliable?

The price and inventory of BZX79-C43,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C43,143 is usually 5 days.

3.What payment methods are accepted for BZX79-C43,143?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C43,143 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-C43,143?

BZX79-C43,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-C43,143 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-C43,143?

For technical support, including BZX79-C43,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C43,143 requirements.

6.How does Aetrix verify that BZX79-C43,143 is sourced from the original manufacturer or authorized distributors?

All BZX79-C43,143 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-C43,143 meets industry standards.

7.What is the process for return or replacement of BZX79-C43,143?

All BZX79-C43,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C43,143, 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-C43,143 part is unused and in its original packaging.

Return procedure for BZX79-C43,143:

1.Submit a request within 90 days.

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

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