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

Nexperia USA Inc. BZX79-B43,113

Name: BZX79-B43,113
Brand: Nexperia USA Inc.
SKU: BZX79-B43,113
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-B43,113

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX79-B43,113.pdf

Description:: DIODE ZENER 43V 400MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:9,849

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Product details

Overview

BZX79-B43,113 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal working voltage 43 V at 2 mA test current, 85 Ω typical differential resistance, and −3.5 mV/K to +46.6 mV/K temperature coefficient. It operates as a low-power voltage reference in bias networks, power supply feedback loops, and overvoltage protection circuits.

For engineers reviewing the BZX79-B43,113 datasheet, BZX79-B43,113 pinout, BZX79-B43,113 application, or BZX79-B43,113 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (380 K/W), non-repetitive peak reverse power dissipation (40 W), and DO-35 package compatibility with through-hole PCB assembly.

Technical Context

This device functions as a two-terminal silicon Zener diode operating in reverse breakdown mode. Its regulation behavior is defined by a specified Zener voltage (42.1–43.9 V) at I_Ztest = 2 mA, with differential resistance of ≤375 Ω and temperature coefficient ranging from −3.5 mV/K (low-voltage types) to +46.6 mV/K (43 V type).

The diode is housed in a hermetically sealed SOD27 (DO-35) glass package with axial leads and cathode band marking. It supports continuous forward current up to 250 mA and withstands non-repetitive peak reverse currents up to 0.6 A for 100 μs pulses at T_j = 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	42.1–43.9 V at I_Z = 2 mA - defines stable reference point for feedback or clamping
Tolerance	±2% - enables precise voltage setting without post-assembly trimming
Differential Resistance (r_dif)	≤375 Ω max - limits output impedance drift under load variation
Temperature Coefficient (S_Z)	+31.4 to +46.6 mV/K - determines reference stability across −65 to +200 °C operating range
Total Power Dissipation (P_tot)	500 mW at T_amb = 50 °C - sets maximum steady-state thermal load on PCB trace
Non-repetitive Peak Power (P_ZSM)	40 W for 100 μs - supports transient surge suppression in input protection stages
Reverse Current (I_R)	50 nA at V_R = 0.7×V_Znom - ensures low leakage in high-impedance reference nodes

Pinout & Package

Hermetically sealed SOD27 (DO-35) axial-leaded glass package with cathode indicated by a colored band. Lead length ≤8 mm; tie-point temperature ≤50 °C.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-side connection	Connected to ground or lower potential node in shunt regulator configuration
Cathode	Zener breakdown terminal / high-side connection	Connected to input rail or regulated node; marked with band for polarity identification

Key Features

Feature	Design Value
±2% Zener voltage tolerance	Enables direct replacement in precision reference designs without calibration adjustment
40 W non-repetitive peak power rating	Allows use in transient voltage suppression without external series limiting resistor
380 K/W junction-to-ambient thermal resistance	Supports operation at full 500 mW dissipation with minimal heatsinking on standard FR-4
Hermetic glass SOD27 package	Ensures long-term parameter stability in humid or corrosive environments

Applications

Power Supply Feedback Reference

Overvoltage Clamp for Microcontroller I/O

Use Scenario: Stabilizing output voltage in linear regulators via TL431-compatible feedback divider.

IC Role / Device Role / Timing Role: Shunt voltage reference providing accurate 43 V threshold for error amplifier comparison.

Use Value: Maintains ±1% output regulation across line/load variations due to tight 42.1–43.9 V tolerance and low r_dif.

Use Scenario: Protecting 3.3 V GPIO pins against accidental 48 V field wiring faults.

IC Role / Device Role / Timing Role: Passive clamp limiting voltage to safe level before ESD diode conduction.

Use Value: Absorbs 40 W surges for 100 μs without degradation, preventing latch-up or gate oxide rupture.

Low-Power Sensor Bias Network

Industrial Current Loop Receiver Reference

Use Scenario: Generating stable bias for photodiode transimpedance amplifier in optical smoke detector.

IC Role / Device Role / Timing Role: Low-drift DC reference establishing fixed operating point for analog front-end.

Use Value: Temperature coefficient of +31.4 to +46.6 mV/K allows predictable drift compensation in firmware calibration.

Use Scenario: Setting 4–20 mA loop compliance voltage threshold in PLC analog input module.

IC Role / Device Role / Timing Role: Precision shunt element defining upper current limit detection point.

Use Value: ±2% tolerance eliminates need for trim-pot adjustment during production test, reducing assembly time.

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 nominal, ±5% tolerance, 70 Ω r_dif, DO-41 package	Higher voltage drift and looser tolerance reduce accuracy in precision feedback	Select when cost sensitivity outweighs regulation accuracy requirements
BZX85C43	43 V nominal, ±5% tolerance, 100 Ω r_dif, DO-41 package, 1.3 W P_tot	Higher power rating but larger footprint and less stable tempco	Choose for higher continuous dissipation where board space permits larger package

Compared with BZX79-B43,113, the 1N4749A offers lower cost but sacrifices ±2% tolerance and DO-35 compactness, while BZX85C43 trades tighter thermal management for greater power handling-making the BZX79-B43,113 optimal for space-constrained, precision-shunt applications.

Availability

BZX79-B43,113 is available at Aetrix Electronics and suitable for industrial sensor interfaces, PLC analog input modules, and telecom power supply feedback circuits requiring stable component supply and long-lifecycle support.

Supply support for BZX79-B43,113 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 legacy Zener diode product line, engineered for low-power voltage regulation and reference applications where stability, small size, and long-term parametric consistency are critical.

FAQ

What is the maximum continuous power dissipation for BZX79-B43,113 at 50 °C ambient?

The BZX79-B43,113 has a total power dissipation rating of 500 mW at T_amb = 50 °C with lead length ≤8 mm and no PCB metallization pad. Derating is required above this temperature per the 380 K/W junction-to-ambient thermal resistance specification.

How is the cathode identified on the BZX79-B43,113 package?

The cathode is marked by a distinct colored band on the glass body of the SOD27 (DO-35) package. This band aligns with the cathode terminal, which must be connected to the higher-potential side in Zener regulation or clamping configurations.

Does BZX79-B43,113 support pulse operation beyond its DC ratings?

Yes - it supports non-repetitive peak reverse power dissipation of 40 W for pulse durations up to 100 μs at T_j = 25 °C, enabling use in transient suppression without additional series limiting components.

What is the typical reverse leakage current at 30 V for BZX79-B43,113?

At V_R = 0.7 × V_Znom = 30.1 V, the maximum reverse current is 50 nA. This ultra-low leakage preserves signal integrity in high-impedance reference and bias networks.

BZX79-B43,113 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

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

Tolerance:: ±2%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 150 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 30.1 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-B43,113 FAQ

1.How can I place an order for BZX79-B43,113 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-B43,113 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-B43,113 reliable?

The price and inventory of BZX79-B43,113 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B43,113 is usually 5 days.

3.What payment methods are accepted for BZX79-B43,113?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B43,113 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-B43,113?

BZX79-B43,113 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-B43,113 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-B43,113?

For technical support, including BZX79-B43,113 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B43,113 requirements.

6.How does Aetrix verify that BZX79-B43,113 is sourced from the original manufacturer or authorized distributors?

All BZX79-B43,113 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-B43,113 meets industry standards.

7.What is the process for return or replacement of BZX79-B43,113?

All BZX79-B43,113 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B43,113, 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-B43,113 part is unused and in its original packaging.

Return procedure for BZX79-B43,113:

1.Submit a request within 90 days.

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

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