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

Nexperia USA Inc. BZX79-B15,143

Name: BZX79-B15,143
Brand: Nexperia USA Inc.
SKU: BZX79-B15,143
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-B15,143

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX79-B15,143.pdf

Description:: DIODE ZENER 15V 400MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:7,905

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Product details

Overview

BZX79-B15,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal 15 V breakdown voltage at 5 mA test current, 50 Ω typical differential resistance, and −65 °C to +200 °C junction temperature range. It operates as a low-power precision voltage reference in bias networks, power supply feedback paths, and overvoltage protection circuits for industrial sensor interfaces and microcontroller I/O conditioning.

For engineers reviewing the BZX79-B15,143 datasheet, BZX79-B15,143 pinout, BZX79-B15,143 application, or BZX79-B15,143 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (380 K/W), non-repetitive peak reverse power (40 W), and DO-35 package compatibility with through-hole PCB assembly and manual rework.

Technical Context

This device functions as a two-terminal silicon Zener diode operating in reverse breakdown mode, delivering stable voltage regulation via controlled avalanche and Zener mechanisms depending on nominal voltage. At 15 V, it exhibits mixed-mode conduction with dominant avalanche contribution, resulting in positive temperature coefficient (+9.2 to +13.0 mV/K) and low dynamic impedance.

Its hermetically sealed SOD27 (DO-35) glass package ensures long-term stability under thermal cycling and humidity exposure. The cathode is marked by a band on the axial leaded body, and electrical performance is specified at T_j = 25 °C with derating above Tamb = 50 °C per 380 K/W junction-to-ambient thermal resistance.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	14.7 V to 15.3 V at I_Z = 5 mA - defines tight regulation window for precision reference use
Differential Resistance r_dif	50 Ω max at I_Z = 5 mA - determines output impedance and load regulation error
Temperature Coefficient S_Z	+9.2 to +13.0 mV/K - quantifies voltage drift vs. ambient change in feedback loops
Total Power Dissipation P_tot	500 mW at T_amb = 50 °C - sets maximum continuous DC power handling on standard PCB
Reverse Current I_R	50 nA max at V_R = 10.5 V - ensures minimal leakage in high-impedance bias networks
Non-repetitive Peak Power P_ZSM	40 W at t_p = 100 μs - supports transient overvoltage clamping without failure
Junction Temperature Range	−65 °C to +200 °C - enables operation in extended industrial and automotive under-hood environments

Pinout & Package

The BZX79-B15,143 is a two-terminal axial-leaded diode in SOD27 (DO-35) hermetically sealed glass package. Cathode is identified by a single dark band near one lead end.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry / Reverse bias reference ground node	Connected to lower-potential side of voltage divider or shunt path; establishes reference return point
Cathode	Reverse breakdown terminal / Regulated output node	Connected to regulated rail or feedback node; voltage at this terminal is stabilized at V_Z

Key Features

Feature	Design Value
±2% Zener voltage tolerance	Enables direct replacement in precision references without recalibration or resistor trimming
Hermetic glass SOD27 package	Guarantees long-term parameter stability and moisture resistance in harsh environments
500 mW total power dissipation	Supports robust operation in space-constrained linear regulators and protection circuits
40 W non-repetitive peak power	Provides reliable transient suppression for ESD and inductive switching events
Low 50 nA reverse leakage at 70% V_Z	Minimizes error in high-impedance sensing and battery-powered standby circuits

Applications

Industrial Sensor Signal Conditioning

Microcontroller I/O Protection

Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in PLC analog input modules.

IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference in Wheatstone bridge bias network.

Use Value: Maintains <±0.3% excitation accuracy across −40 °C to +85 °C ambient, reducing measurement drift.

Use Scenario: Clamping GPIO pins against ESD and bus overvoltage in embedded control units.

IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed between I/O line and ground.

Use Value: Limits pin voltage to ≤15.3 V during 8 kV HBM ESD events while drawing <100 nA leakage in normal operation.

Linear Power Supply Feedback

Overvoltage Detection Threshold

Use Scenario: Setting precise output voltage in adjustable LDO feedback divider for telecom power rails.

IC Role / Device Role / Timing Role: Precision reference element replacing resistor divider top leg in TL431-based feedback loop.

Use Value: Achieves ±1.2% output regulation accuracy without trim potentiometer, simplifying BOM and layout.

Use Scenario: Triggering shutdown circuit when 12 V system rail exceeds safe limit during load dump.

IC Role / Device Role / Timing Role: Threshold detector connected to comparator input via resistive divider.

Use Value: Activates protection at 15.0 V ±0.3 V with <1 μs response due to low capacitance (<2 pF at 0 V).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4744A	Same 15 V nominal, ±5% tolerance, higher r_dif (20 Ω typ), TO-204AA (DO-41) package	Less precise regulation; larger footprint; higher thermal resistance (400 K/W)	Acceptable where cost sensitivity outweighs tolerance and thermal performance requirements
BZX84-C15	15 V nominal, ±5%, SOT-23 surface-mount, 300 mW P_tot, 15 Ω r_dif	Not pin-compatible; requires PCB redesign; unsuitable for high-temp through-hole designs	Preferred for space-constrained PCBs where reflow assembly and smaller size justify looser tolerance

Compared with 1N4744A and BZX84-C15, BZX79-B15,143 delivers tighter ±2% tolerance, lower thermal resistance (380 K/W), and proven reliability in hermetic glass packaging-making it optimal for industrial-grade voltage references requiring long-term stability and through-hole serviceability.

Availability

BZX79-B15,143 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, microcontroller I/O protection, and linear power supply feedback requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for BZX79-B15,143 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 business, with focus 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 reference applications where precision, reliability, and hermetic packaging are critical.

FAQ

What is the maximum continuous power dissipation for BZX79-B15,143 at 70 °C ambient?

At 70 °C ambient, the device must be derated from its 500 mW rating at 50 °C using R_{th j-a} = 380 K/W. The allowable power drops to approximately 395 mW, calculated as P = (T_jmax − T_amb) / R_{th j-a} = (200 − 70) / 380 ≈ 0.342 W, but datasheet specifies 400 mW at 50 °C and 0 mW at 150 °C - linear interpolation yields ~395 mW at 70 °C.

Does BZX79-B15,143 have a defined forward voltage specification?

Yes - forward voltage is specified as 0.9 V maximum at I_F = 10 mA and T_j = 25 °C. This value reflects typical silicon diode conduction behavior and is relevant for polarity-check circuits or series-connected protection configurations.

Can BZX79-B15,143 be used in place of a 1N5245B in a 15 V reference design?

No - 1N5245B is a 15 V, ±5% Zener in DO-35 but with different differential resistance (17 Ω typ), temperature coefficient (+12 mV/K), and tighter thermal specs. BZX79-B15,143 offers superior tolerance (±2%) but higher r_dif (50 Ω), requiring circuit-level verification of regulation error and thermal margin.

Is the cathode marking consistent across all BZX79-B15,143 units?

Yes - per Nexperia's SOD27 package standard, the cathode is always indicated by a single dark band on the glass body adjacent to the cathode lead. This marking is laser-etched or ink-printed and verified during final test and visual inspection per AEC-Q200-aligned quality protocols.

BZX79-B15,143 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):: 15 V

Tolerance:: ±2%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 30 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 10.5 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-B15,143 FAQ

1.How can I place an order for BZX79-B15,143 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-B15,143 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-B15,143 reliable?

The price and inventory of BZX79-B15,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B15,143 is usually 5 days.

3.What payment methods are accepted for BZX79-B15,143?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B15,143 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-B15,143?

BZX79-B15,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-B15,143 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-B15,143?

For technical support, including BZX79-B15,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B15,143 requirements.

6.How does Aetrix verify that BZX79-B15,143 is sourced from the original manufacturer or authorized distributors?

All BZX79-B15,143 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-B15,143 meets industry standards.

7.What is the process for return or replacement of BZX79-B15,143?

All BZX79-B15,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B15,143, 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-B15,143 part is unused and in its original packaging.

Return procedure for BZX79-B15,143:

1.Submit a request within 90 days.

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

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