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

Nexperia USA Inc. BZX79-B4V3,143

Name: BZX79-B4V3,143
Brand: Nexperia USA Inc.
SKU: BZX79-B4V3,143
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-B4V3,143

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX79-B4V3,143.pdf

Description:: DIODE ZENER 4.3V 400MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:2,205

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Product details

Overview

BZX79-B4V3,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 4.3 V nominal Zener voltage at 5 mA test current, 410 Ω typical differential resistance, and −2.5 mV/K temperature coefficient. It delivers stable low-voltage reference or stabilization in power supply feedback paths, sensor biasing circuits, and overvoltage protection clamps.

For engineers reviewing the BZX79-B4V3,143 datasheet, BZX79-B4V3,143 pinout, BZX79-B4V3,143 application, or BZX79-B4V3,143 equivalent, this part serves as a precision 4.3 V reference with tight tolerance, low dynamic impedance, and predictable thermal drift-critical for analog sensing, LDO feedback, and voltage threshold detection where ±2% regulation stability is required.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified Zener voltage of 4.21–4.39 V at I_Z = 5 mA, exhibiting a typical differential resistance of 410 Ω and a negative temperature coefficient of −2.5 mV/K. Its low 3 μA reverse leakage at V_R = 1 V ensures minimal quiescent current draw in standby-sensitive designs.

Designed for DC voltage regulation and reference applications, it supports continuous forward current up to 250 mA and non-repetitive peak reverse power dissipation of 40 W for 100 μs pulses. Thermal resistance from junction to ambient is 380 K/W under standard PCB mounting conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.21–4.39 V at I_Z = 5 mA - defines precise regulation point for feedback or clamping
Tolerance	±2% - enables tighter system-level voltage accuracy vs. ±5% C-series variants
Differential Resistance (r_dif)	410 Ω typ. at I_Z = 5 mA - determines load regulation sensitivity and output impedance
Temperature Coefficient (S_Z)	−2.5 mV/K at I_Z = 5 mA - quantifies voltage drift over temperature; negative sign indicates decreasing V_Z with rising T_j
Reverse Leakage (I_R)	3 μA max. at V_R = 1 V - ensures low standby power loss in always-on reference circuits
Total Power Dissipation (P_tot)	500 mW at T_amb = 50 °C - sets maximum steady-state power handling on standard PCB
Package	SOD27 (DO-35) - axial-leaded, hermetically sealed glass package with cathode band marking

Pinout & Package

Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a colored band. Leads are tinned and suitable for through-hole soldering. No metallization pad required per datasheet mounting note.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-side connection in reverse-biased Zener operation	Connected to circuit ground or lower potential node when used as shunt regulator
Cathode	Zener breakdown terminal / high-side connection in reverse-biased operation	Connected to regulated voltage node; marked by colored band on glass body

Key Features

Feature	Design Value
±2% Zener voltage tolerance	Enables accurate voltage references without post-calibration in analog sensor interfaces and power supply feedback loops
410 Ω typical differential resistance	Minimizes output voltage variation under changing load current-critical for stable LDO or op-amp reference inputs
−2.5 mV/K temperature coefficient	Predictable, linear V_Z drift allows compensation in temperature-critical bias networks
Hermetic SOD27 (DO-35) packaging	Ensures long-term reliability and moisture resistance in industrial and automotive environments
40 W non-repetitive peak power rating	Supports transient overvoltage clamping in ESD-protected I/O lines and surge-prone power rails

Applications

Power Supply Feedback Reference

Sensor Biasing Network

Use Scenario: Used in the feedback divider of a 5 V switching regulator to set output voltage precisely.

IC Role / Device Role / Timing Role: Shunt Zener reference providing stable 4.3 V threshold to error amplifier input.

Use Value: ±2% tolerance and low r_dif maintain output regulation within ±1.5% across line/load/temperature.

Use Scenario: Supplies bias current to a silicon photodiode in an optical smoke detector.

IC Role / Device Role / Timing Role: Low-drift voltage reference establishing fixed photocurrent-to-voltage conversion point.

Use Value: −2.5 mV/K TC minimizes signal offset drift over −40 °C to +85 °C operating range.

Overvoltage Clamp for MCU I/O

Low-Power Voltage Threshold Detector

Use Scenario: Placed between a 3.3 V GPIO line and ground to limit ESD-induced transients.

IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing >1 kV HBM surges before IC damage occurs.

Use Value: 40 W non-repetitive peak power rating handles 100 μs surges without degradation.

Use Scenario: Paired with comparator to trigger battery low-voltage alert at 4.3 V cutoff.

IC Role / Device Role / Timing Role: Precision threshold reference defining exact trip point for hysteresis-free detection.

Use Value: Tight 4.21–4.39 V window eliminates false triggers in Li-ion battery monitoring.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX79-C4V3,113	±5% tolerance (4.0–4.6 V), higher r_dif (up to 600 Ω), same SOD27 package	Acceptable where cost sensitivity outweighs precision; less stable under varying load/temperature	Select for non-critical biasing or cost-driven consumer designs where ±5% is sufficient
MMSZ4V3T1G	Surface-mount SOD-123 package, ±5% tolerance, 300 Ω r_dif, 500 mW P_tot	Requires PCB redesign for SMT; better thermal performance but no hermetic seal	Choose for space-constrained boards needing automated assembly and moderate precision

Compared with BZX79-C4V3,113 and MMSZ4V3T1G, the BZX79-B4V3,143 offers superior voltage accuracy and thermal stability in a rugged hermetic package-making it optimal for industrial feedback, sensor biasing, and legacy through-hole designs where long-term calibration integrity matters.

Availability

BZX79-B4V3,143 is available at Aetrix Electronics and suitable for industrial power supplies, analog sensor modules, automotive body electronics, and medical instrumentation requiring stable component supply and long-lifecycle support.

Supply support for BZX79-B4V3,143 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, spun off from NXP's Standard Products division in 2017 and focused on automotive, industrial, computing, and consumer markets.

The BZX79 series belongs to Nexperia's legacy Zener diode portfolio designed specifically for low-power voltage regulation and precision reference applications in cost-sensitive, high-reliability systems.

FAQ

What is the maximum continuous power dissipation for BZX79-B4V3,143?

The BZX79-B4V3,143 has a total power dissipation rating of 500 mW at ambient temperature of 50 °C with standard lead length (≤8 mm) and no PCB metallization pad. At higher ambient temperatures, derating applies per the thermal resistance of 380 K/W.

How is polarity identified on the BZX79-B4V3,143 package?

The cathode is marked by a distinct colored band on the glass body of the SOD27 (DO-35) package. When mounted in-circuit, the banded end connects to the higher-potential node during Zener operation-i.e., the regulated voltage rail-while the anode connects to ground or lower potential.

Does BZX79-B4V3,143 support transient overvoltage suppression?

Yes-it is rated for non-repetitive peak reverse power dissipation of 40 W at pulse duration of 100 μs, making it suitable for clamping short-duration transients such as ESD events or inductive switch-off spikes in low-energy signal paths.

Can BZX79-B4V3,143 be used in place of BZX79-B4V3,113?

Yes-both share identical electrical specifications and SOD27 packaging; the suffix difference (143 vs. 113) reflects Nexperia's internal ordering codes and date/lot traceability, not functional variation. They are electrically and mechanically interchangeable.

BZX79-B4V3,143 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Box (TB)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 4.3 V

Tolerance:: ±2%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 90 Ohms

Current - Reverse Leakage @ Vr:: 3 µA @ 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-B4V3,143 FAQ

1.How can I place an order for BZX79-B4V3,143 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-B4V3,143 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-B4V3,143 reliable?

The price and inventory of BZX79-B4V3,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B4V3,143 is usually 5 days.

3.What payment methods are accepted for BZX79-B4V3,143?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B4V3,143 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-B4V3,143?

BZX79-B4V3,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-B4V3,143 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-B4V3,143?

For technical support, including BZX79-B4V3,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B4V3,143 requirements.

6.How does Aetrix verify that BZX79-B4V3,143 is sourced from the original manufacturer or authorized distributors?

All BZX79-B4V3,143 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-B4V3,143 meets industry standards.

7.What is the process for return or replacement of BZX79-B4V3,143?

All BZX79-B4V3,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B4V3,143, 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-B4V3,143 part is unused and in its original packaging.

Return procedure for BZX79-B4V3,143:

1.Submit a request within 90 days.

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

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