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

onsemi BZX55C6V8_T26A

Name: BZX55C6V8_T26A
Brand: onsemi
SKU: BZX55C6V8_T26A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX55C6V8_T26A

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: BZX55C6V8_T26A.pdf

Description:: DIODE ZENER 6.8V 500MW DO35

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Inventory:4,250

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Product details

Overview

BZX55C6V8_T26A from Fairchild Semiconductor is a 6.8 V, ±5% tolerance Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 8 Ω dynamic impedance at 5 mA test current and 0.1 μA maximum reverse leakage at 5.2 V. It provides precise voltage regulation in low-power reference and protection circuits.

For engineers reviewing the BZX55C6V8_T26A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, thermal derating behavior, junction temperature range (–65°C to +200°C), and compatibility with through-hole PCB layouts requiring DO-35 footprint.

Technical Context

The BZX55C6V8_T26A operates as a two-terminal silicon planar Zener diode optimized for voltage regulation and overvoltage clamping in DC bias networks. Its 6.8 V nominal breakdown voltage is specified at 5 mA test current with 8 Ω dynamic impedance (ZZ), ensuring stable regulation under moderate load variation.

It features a –65°C to +200°C operating and storage temperature range, 4.0 mW/°C thermal derating above 75°C, and 0.1 μA reverse leakage current at VR = 5.2 V - enabling reliable performance in industrial and automotive ambient environments without active cooling.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	6.4 V min / 7.2 V max at I_Z = 5 mA - defines usable regulation window for precision 6.8 V references
Dynamic Impedance (Z_Z)	8 Ω at I_Z = 5 mA - indicates low output impedance for minimal voltage shift under load changes
Power Dissipation (P_D)	500 mW @ T_L ≤ 75°C - sets maximum steady-state power handling before thermal derating applies
Reverse Leakage (I_R)	0.1 μA @ V_R = 5.2 V - ensures negligible quiescent current in standby or high-impedance sensing nodes
Max Zener Current (I_ZM)	58 mA - derived from P_D and V_Z, limits peak clamping duty cycle in transient suppression
Operating Temp Range	–65°C to +200°C - supports deployment in under-hood, power supply, and industrial control environments

Pinout & Package

DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal connections beyond anode and cathode leads.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower potential side in reverse-biased regulation configuration
Cathode	Zener breakdown terminal	Marked with color band; connected to higher potential side to enable controlled avalanche conduction

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables tight regulation without post-manufacturing trimming in cost-sensitive designs
DO-35 glass package	Provides hermetic sealing and thermal stability for long-term parameter consistency
Low 0.1 μA leakage at 5.2 V	Minimizes error in high-impedance feedback or sensor bias networks
8 Ω dynamic impedance	Reduces output voltage variation across 1–10 mA load current range in shunt regulator topologies

Applications

Power Supply Reference	Overvoltage Clamp
Use Scenario: Providing stable 6.8 V reference for linear regulator feedback or ADC voltage reference divider. IC Role / Device Role / Timing Role: Shunt voltage reference element maintaining fixed node voltage via controlled reverse conduction. Use Value: Delivers ±5% accuracy and 8 Ω impedance to hold reference node within 15 mV across 2–8 mA load variation.	Use Scenario: Protecting microcontroller I/O pins from ESD or inductive kickback exceeding 7.2 V. IC Role / Device Role / Timing Role: Passive clamping device diverting excess energy to ground when input exceeds V_Z. Use Value: Limits transient voltage to ≤7.2 V with <58 mA peak current, compatible with standard 0.25 W PCB trace routing.
Current Source Bias	Temperature-Stable Sensor Excitation
Use Scenario: Generating constant current for LED bias or transistor base drive using resistor-Zener topology. IC Role / Device Role / Timing Role: Voltage-controlled current limiter establishing predictable I_OUT = (V_IN − 6.8 V)/R. Use Value: Maintains current stability within ±8% over –40°C to +85°C due to low tempco and 200°C max junction rating.	Use Scenario: Supplying excitation voltage to RTD or thermistor bridges requiring stable, low-noise bias. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA) voltage source minimizing measurement offset in Wheatstone configurations. Use Value: Reduces bridge imbalance error to <0.02% FS by limiting bias current drift and leakage-induced offset.

Power Supply Reference

Overvoltage Clamp

Use Scenario: Providing stable 6.8 V reference for linear regulator feedback or ADC voltage reference divider.

IC Role / Device Role / Timing Role: Shunt voltage reference element maintaining fixed node voltage via controlled reverse conduction.

Use Value: Delivers ±5% accuracy and 8 Ω impedance to hold reference node within 15 mV across 2–8 mA load variation.

Use Scenario: Protecting microcontroller I/O pins from ESD or inductive kickback exceeding 7.2 V.

IC Role / Device Role / Timing Role: Passive clamping device diverting excess energy to ground when input exceeds V_Z.

Use Value: Limits transient voltage to ≤7.2 V with <58 mA peak current, compatible with standard 0.25 W PCB trace routing.

Current Source Bias

Temperature-Stable Sensor Excitation

Use Scenario: Generating constant current for LED bias or transistor base drive using resistor-Zener topology.

IC Role / Device Role / Timing Role: Voltage-controlled current limiter establishing predictable I_OUT = (V_IN − 6.8 V)/R.

Use Value: Maintains current stability within ±8% over –40°C to +85°C due to low tempco and 200°C max junction rating.

Use Scenario: Supplying excitation voltage to RTD or thermistor bridges requiring stable, low-noise bias.

IC Role / Device Role / Timing Role: Low-leakage (0.1 μA) voltage source minimizing measurement offset in Wheatstone configurations.

Use Value: Reduces bridge imbalance error to <0.02% FS by limiting bias current drift and leakage-induced offset.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4734A	Same 6.8 V nominal, but ±5% tolerance and 7 Ω Z_Z; DO-41 package (larger than DO-35)	Requires PCB pad revision due to longer lead spacing and larger body; higher thermal mass slows response	Prefer where board space allows and higher surge current rating (1000 mW) is needed
MMSZ4688	Same 6.8 V, ±5%, SOD-123 surface-mount package; 500 mW rating but derates faster above 75°C	Not drop-in - requires rework for SMT assembly and eliminates axial through-hole mounting	Select for automated assembly or space-constrained layouts where thermal profile permits

Compared with 1N4734A and MMSZ4688, the BZX55C6V8_T26A offers identical voltage specification and tighter thermal derating control in a compact DO-35 form factor ideal for prototyping, repair, and legacy through-hole designs.

Availability

BZX55C6V8_T26A is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and bias network applications requiring stable component supply across industrial control, power supply design, and sensor interface development.

Supply support for BZX55C6V8_T26A 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The BZX55 series was designed as a general-purpose, low-cost Zener diode family for precision voltage regulation and clamping in consumer, industrial, and computing power systems.

FAQ

What is the exact Zener voltage range for BZX55C6V8_T26A at 25°C?

The BZX55C6V8_T26A has a guaranteed Zener voltage range of 6.4 V minimum to 7.2 V maximum when measured at 5 mA test current and 25°C ambient. This ±5% tolerance is confirmed in the Fairchild BZX55C2V4–BZX55C56 datasheet Rev. D1, Table "Electrical Characteristics", row for BZX55C6V8.

Does BZX55C6V8_T26A support operation above 100°C junction temperature?

Yes - the BZX55C6V8_T26A is rated for junction and storage temperatures from –65°C to +200°C. Its absolute maximum rating allows continuous operation up to +200°C, though power must be derated by 4.0 mW/°C above 75°C lead temperature per the datasheet's Absolute Maximum Ratings table.

What is the reverse leakage current specification for BZX55C6V8_T26A?

The BZX55C6V8_T26A specifies a maximum reverse leakage current (I_R) of 0.1 μA at V_R = 5.2 V and T_a = 25°C. This value is critical for high-impedance bias networks and appears in the Electrical Characteristics table under the BZX55C6V8 entry.

Is BZX55C6V8_T26A available in tape-and-reel packaging for automated assembly?

No - the BZX55C6V8_T26A is supplied in bulk or ammo-pack formats per Fairchild's original packaging specification. It is not offered in tape-and-reel; for SMT-compatible automated placement, consider alternatives like MMSZ4688 or BZX84-C6V8.

What does the "_T26A" suffix indicate in BZX55C6V8_T26A?

The "_T26A" suffix denotes Fairchild's internal tape-and-reel or packaging variant code - however, for BZX55C6V8_T26A, this identifier corresponds to the standard DO-35 glass axial device with cathode band marking and 5% tolerance, consistent with the BZX55C6V8 base part in the Rev. D1 datasheet.

BZX55C6V8_T26A Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 6.8 V

Tolerance:: ±6%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 8 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 3 V

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 100 mA

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

BZX55C6V8_T26A FAQ

1.How can I place an order for BZX55C6V8_T26A through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX55C6V8_T26A 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 BZX55C6V8_T26A reliable?

The price and inventory of BZX55C6V8_T26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C6V8_T26A is usually 5 days.

3.What payment methods are accepted for BZX55C6V8_T26A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C6V8_T26A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX55C6V8_T26A?

BZX55C6V8_T26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX55C6V8_T26A 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 BZX55C6V8_T26A?

For technical support, including BZX55C6V8_T26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C6V8_T26A requirements.

6.How does Aetrix verify that BZX55C6V8_T26A is sourced from the original manufacturer or authorized distributors?

All BZX55C6V8_T26A 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 BZX55C6V8_T26A meets industry standards.

7.What is the process for return or replacement of BZX55C6V8_T26A?

All BZX55C6V8_T26A units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C6V8_T26A, 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 BZX55C6V8_T26A part is unused and in its original packaging.

Return procedure for BZX55C6V8_T26A:

1.Submit a request within 90 days.

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

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