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

Nexperia USA Inc. BZX79-C6V8,143

Name: BZX79-C6V8,143
Brand: Nexperia USA Inc.
SKU: BZX79-C6V8,143
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-C6V8,143

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX79-C6V8,143.pdf

Description:: DIODE ZENER 6.8V 400MW ALF2

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Product details

Overview

BZX79-C6V8,143 from Nexperia is a ±5% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 6.66–7.2 V nominal Zener voltage at 5 mA test current, 30–80 Ω differential resistance, and 2 μA reverse leakage at 4 V. It delivers stable low-voltage reference or stabilization in power supply feedback paths, voltage clamp circuits, and precision bias networks.

For engineers reviewing the BZX79-C6V8,143 datasheet, BZX79-C6V8,143 pinout, BZX79-C6V8,143 application, or BZX79-C6V8,143 equivalent, this page provides verified electrical parameters, thermal behavior, junction-to-ambient thermal resistance (380 K/W), cathode-marked axial lead configuration, and direct replacement guidance for legacy NXP BZX79-C series designs.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable reference voltage across its terminals under controlled current conditions. Its temperature coefficient of +1.2 to +4.5 mV/K (at I_Z = 5 mA) enables predictable drift compensation in mid-range voltage references, while its 500 mW total power dissipation at T_amb = 50 °C supports continuous operation in compact PCB layouts without forced cooling.

The device exhibits low dynamic impedance (30–80 Ω typical at 5 mA), enabling effective ripple suppression in shunt-regulated supplies. Its non-repetitive peak reverse power dissipation reaches 40 W for 100 μs pulses, allowing transient overvoltage clamping in low-energy surge scenarios without degradation.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	6.66–7.2 V at I_Z = 5 mA - defines stable regulation window for 6.8 V nominal reference applications
Differential Resistance (r_diff)	30–80 Ω - determines output impedance and load regulation sensitivity in shunt configurations
Reverse Leakage Current (I_R)	2 μA at V_R = 4 V - ensures minimal quiescent current draw in battery-powered voltage monitors
Power Dissipation (P_tot)	500 mW at T_amb = 50 °C - sets maximum continuous DC power handling on standard FR-4 PCBs
Thermal Resistance (R_{th j-a})	380 K/W - defines junction-to-ambient temperature rise per watt, critical for derating in enclosed environments
Temperature Coefficient (S_Z)	+1.2 to +4.5 mV/K - quantifies voltage drift with temperature, enabling compensation in precision references
Package	SOD27 (DO-35) - hermetically sealed axial glass package with cathode band marking, suitable for wave soldering and manual assembly

Pinout & Package

SOD27 (DO-35) is a hermetically sealed axial-lead glass package with cathode identified by a colored band. Leads are tinned copper-clad steel, compatible with standard PCB through-hole mounting and wave soldering processes.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-side connection in shunt regulation	Connected to ground or lower potential node; carries forward current up to 250 mA
Cathode	Zener breakdown terminal / high-side connection in shunt regulation	Marked with band; connected to regulated voltage node; sustains reverse breakdown at specified V_Z

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables cost-effective voltage referencing where tight regulation is not required, e.g., power supply feedback sensing
Hermetic glass SOD27 package	Ensures long-term stability and moisture resistance in industrial environments without conformal coating
Low 2 μA reverse leakage at 4 V	Minimizes standby current in always-on voltage monitor circuits, extending battery life
40 W non-repetitive peak power rating	Supports transient overvoltage clamping in low-energy ESD or inductive kickback protection
30–80 Ω dynamic impedance	Provides predictable load regulation and ripple rejection in shunt-based linear regulators

Applications

Power Supply Feedback Reference

Voltage Clamp for Signal Lines

Use Scenario: Used in the feedback divider of an isolated flyback converter to regulate output voltage via optocoupler-coupled error amplifier.

IC Role / Device Role / Timing Role: Zener diode provides precise 6.8 V reference point for TL431-like comparator input, setting output regulation threshold.

Use Value: Stable V_Z and low r_diff ensure <±1% output voltage accuracy across line/load/temperature variations.

Use Scenario: Placed across RS-232 receiver inputs to limit signal swing and prevent damage from induced transients.

IC Role / Device Role / Timing Role: Acts as bidirectional clamp-forward-conducting below 0.9 V, reverse-breaking above 6.8 V-to confine voltage to safe range.

Use Value: Low leakage (2 μA) avoids loading the signal line; fast response protects against sub-microsecond spikes without adding capacitance.

Microcontroller Reset Circuit

Current Source Bias Network

Use Scenario: Integrated into RC-reset circuit with pull-up resistor to generate clean power-on reset pulse for ARM Cortex-M0 microcontrollers.

IC Role / Device Role / Timing Role: Zener holds reset line at 6.8 V until supply stabilizes, then allows capacitor discharge to trigger active-low reset release.

Use Value: Predictable V_Z tolerance (±5%) and temperature coefficient (+1.2 to +4.5 mV/K) enable deterministic reset timing across −40 °C to +85 °C.

Use Scenario: Configured in constant-current sink topology with series resistor to bias op-amp input stage in analog sensor interface.

IC Role / Device Role / Timing Role: Maintains fixed voltage drop across resistor, generating stable bias current independent of supply variation.

Use Value: Low r_diff (30–80 Ω) minimizes current drift with load changes; hermetic package ensures long-term bias stability in humid environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4734A	6.8 V ±5%, DO-41 package, 1 W P_tot, higher r_diff (10 Ω min)	Larger footprint and higher power handling; less suitable for space-constrained PCBs	Select when >500 mW continuous dissipation is required and board area permits DO-41
BZX55C6V8	6.8 V ±5%, DO-35 package, 500 mW P_tot, but higher leakage (5 μA at 4 V)	Same form factor but reduced noise immunity due to 2.5× higher reverse leakage	Select only if BZX79-C6V8,143 is unavailable and leakage sensitivity is not critical

Compared with 1N4734A and BZX55C6V8, BZX79-C6V8,143 offers optimal balance of DO-35 size, low leakage (2 μA), and tight r_diff (30–80 Ω), making it preferred for compact, low-power, precision-biased analog and digital control circuits.

Availability

BZX79-C6V8,143 is available at Aetrix Electronics and suitable for power supply feedback references, voltage clamp circuits, microcontroller reset networks, and current source bias networks requiring stable component supply and long-term parametric consistency.

Supply support for BZX79-C6V8,143 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, 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 reliability, hermetic sealing, and consistent E24 voltage grading are essential.

FAQ

What is the maximum continuous reverse current this diode can sustain at 6.8 V?

The BZX79-C6V8,143 does not specify a maximum continuous reverse current at 6.8 V; instead, it defines Zener test current (I_Ztest = 5 mA) and maximum total power dissipation (500 mW at T_amb = 50 °C). At 6.8 V, this corresponds to ~73.5 mA absolute maximum continuous reverse current before exceeding P_tot, assuming no additional thermal margin.

Is this diode suitable for use in automotive under-hood applications?

No - while the BZX79-C6V8,143 has a junction temperature range of −65 °C to +200 °C, it is not AEC-Q200 qualified and lacks automotive-grade screening, traceability, or guaranteed PPAP documentation. It is intended for industrial, computing, and consumer applications per Nexperia's product classification.

How does the cathode band orientation affect PCB layout?

The cathode band must align with the designated high-side net (e.g., regulated voltage node); incorrect orientation causes forward conduction instead of Zener breakdown. In SOD27, the band marks the cathode lead - verify silkscreen polarity and ensure automated placement libraries reflect axial lead polarity mapping to avoid functional failure.

Can this Zener replace a BZX79-B6V8 in existing designs?

Yes, but with trade-offs: BZX79-C6V8,143 has ±5% tolerance versus ±2% for the 'B' grade, resulting in wider V_Z spread (6.4–7.2 V vs. 6.66–6.94 V). Use only where system-level tolerance budgets accommodate the broader range; verify stability margins in feedback loops and clamp thresholds before substitution.

BZX79-C6V8,143 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):: 6.8 V

Tolerance:: ±5%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 15 Ohms

Current - Reverse Leakage @ Vr:: 2 µA @ 4 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-C6V8,143 FAQ

1.How can I place an order for BZX79-C6V8,143 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-C6V8,143 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-C6V8,143 reliable?

The price and inventory of BZX79-C6V8,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C6V8,143 is usually 5 days.

3.What payment methods are accepted for BZX79-C6V8,143?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C6V8,143 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-C6V8,143?

BZX79-C6V8,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-C6V8,143 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-C6V8,143?

For technical support, including BZX79-C6V8,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C6V8,143 requirements.

6.How does Aetrix verify that BZX79-C6V8,143 is sourced from the original manufacturer or authorized distributors?

All BZX79-C6V8,143 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-C6V8,143 meets industry standards.

7.What is the process for return or replacement of BZX79-C6V8,143?

All BZX79-C6V8,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C6V8,143, 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-C6V8,143 part is unused and in its original packaging.

Return procedure for BZX79-C6V8,143:

1.Submit a request within 90 days.

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

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