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onsemi BZX85C6V8
- Part No.:
- BZX85C6V8
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C6V8.pdf
- Description:
- DIODE ZENER 6.8V 1.3W DO41G
- Quantity:
- Payment:
- Shipping:
Inventory:117,000
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Product details
Overview
BZX85C6V8 from Fairchild Semiconductor is a 6.8 V, ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, designed for voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and precision biasing networks operating up to +200°C junction temperature.
For engineers reviewing the BZX85C6V8 datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy at 35 mA test current, low dynamic impedance (35 Ω @ 35 mA), leakage current ≤4 μA at 5.1 V, and thermal stability across -65°C to +200°C.
Technical Context
The BZX85C6V8 operates as a silicon planar Zener diode with controlled avalanche breakdown at nominal 6.8 V, specified under thermal equilibrium conditions at 30°C lead temperature and 3/8″ lead length. Its 1.0 W power rating at 25°C ambient is derated linearly above 50°C at 6.67 mW/°C.
It exhibits forward voltage ≤1.2 V at 200 mA and reverse leakage ≤4 μA at VR = 5.1 V, supporting stable DC reference generation in low-noise analog circuits and robust clamping in industrial control I/O protection stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.4 V min / 7.2 V max at IZ = 35 mA - defines regulated output range under standard test conditions |
| Zener Impedance (ZZ) | 35 Ω @ IZ = 35 mA - ensures minimal output voltage variation under load changes |
| Power Dissipation (PD) | 1.0 W @ TA = 25°C - sets maximum continuous DC power handling in free-air mounting |
| Leakage Current (IR) | ≤4 μA @ VR = 5.1 V - guarantees low standby current in high-impedance reference nodes |
| Operating Temperature | -65°C to +200°C - enables use in automotive engine compartments and industrial motor drives |
| Forward Voltage (VF) | ≤1.2 V @ IF = 200 mA - supports bidirectional clamping and polarity detection functions |
Pinout & Package
DO-41 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 | Current entry terminal in forward bias | Connected to lower-potential node when used as clamp or regulator |
| Cathode | Current exit terminal in forward bias; Zener breakdown terminal in reverse bias | Marked with color band; connected to regulated voltage rail in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Ensures predictable regulation without post-production trimming in cost-sensitive designs |
| Low Zener impedance (35 Ω) | Maintains <±20 mV output shift across 10–50 mA load current variations |
| High-temperature operation (TJ = +200°C) | Supports placement near heat-generating components without derating penalties |
| DO-41 glass hermetic package | Provides long-term reliability in humid or chemically aggressive environments |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulates error amplifier reference in isolated flyback converter feedback loop. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 6.8 V threshold for optocoupler-driven control. Use Value: Enables ±1% output voltage accuracy despite transformer winding ratio tolerances and optocoupler CTR variation. |
Use Scenario: Biases bridge amplifier input in 4–20 mA transmitter front-end. IC Role / Device Role / Timing Role: Precision DC reference source for op-amp common-mode level setting. Use Value: Maintains sensor linearity over -40°C to +85°C ambient due to low TCZ and stable leakage. |
| Overvoltage Clamp for MCU I/O | Automotive Body Control Module Reference |
Use Scenario: Protects 3.3 V GPIO pins against ESD and load dump transients. IC Role / Device Role / Timing Role: Reverse-biased transient voltage suppressor clamping at 6.8 V. Use Value: Limits pin voltage to safe margin below absolute maximum ratings while dissipating ≤1 W peak energy. |
Use Scenario: Supplies stable reference to ADC and comparator in BCM power management IC. IC Role / Device Role / Timing Role: Low-drift voltage reference for battery monitoring circuitry. Use Value: Delivers <50 ppm/°C effective TCZ across -40°C to +125°C engine bay environment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4734A | Same 6.8 V nominal rating but ±5% tolerance, 1.0 W, DO-41; ZZ = 5 Ω @ 41 mA - lower impedance but higher test current | Optimized for higher-current regulation; less suitable for low-IZ bias networks | Select when tighter regulation under >30 mA load is required; verify thermal layout for higher IZ test point |
| MMBZ5236B | SOT-23 surface-mount, 6.8 V ±5%, 0.35 W; ZZ = 13 Ω @ 20 mA - smaller footprint, lower power, different thermal profile | Designed for space-constrained PCBs; not interchangeable without layout revision | Choose for compact consumer electronics where board area is critical and power dissipation ≤0.35 W suffices |
Compared with 1N4734A and MMBZ5236B, the BZX85C6V8 offers balanced performance for through-hole industrial designs requiring 1 W power handling, DO-41 mechanical robustness, and proven high-temperature reliability without reflow constraints.
Availability
BZX85C6V8 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, overvoltage protection circuits, and automotive body control modules requiring stable component supply and long-lifecycle support.
Supply support for BZX85C6V8 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 leading designer of high-performance analog and discrete semiconductors, acquired by ON Semiconductor in 2016; its legacy Zener diode portfolio remains widely deployed in industrial and automotive systems.
The BZX85 series was engineered for general-purpose voltage regulation and reference applications demanding wide temperature range operation, tight tolerance, and glass-package reliability in harsh environments.
FAQ
What is the nominal Zener voltage and tolerance of the BZX85C6V8?
The BZX85C6V8 has a nominal Zener voltage of 6.8 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 6.4 V and 7.2 V when measured at 35 mA test current and 30°C lead temperature. This tolerance band is guaranteed across the full operating temperature range and supports consistent performance in untrimmed voltage reference designs.
What is the maximum power dissipation for the BZX85C6V8 at 75°C ambient?
At 75°C ambient, the BZX85C6V8 must be derated from its 1.0 W rating at 25°C. With a derating factor of 6.67 mW/°C above 50°C, the allowable power drops to 1.0 W − (25°C × 6.67 mW/°C) = 0.833 W. This ensures junction temperature remains within the -65°C to +200°C limit under sustained operation.
How does the BZX85C6V8 compare to the BZX85C6V2 in terms of Zener impedance?
The BZX85C6V8 has a specified Zener impedance of 35 Ω at 35 mA, while the BZX85C6V2 is rated at 35 Ω at 30 mA. Though both share identical impedance values, the BZX85C6V8's lower test current requirement (35 mA vs. 30 mA for BZX85C6V2) reflects optimized doping for improved regulation stability near its nominal voltage point.
Can the BZX85C6V8 be used in forward-bias applications?
Yes, the BZX85C6V8 can operate in forward bias with a maximum forward voltage of 1.2 V at 200 mA, per its datasheet specification. This allows dual-use functionality - for example, as a polarity protection diode in series with its Zener regulation path - though its primary design intent remains reverse-bias voltage regulation.
Is the BZX85C6V8 compliant with RoHS and halogen-free requirements?
The BZX85C6V8 manufactured by Fairchild Semiconductor meets RoHS Directive 2011/65/EU requirements and is halogen-free per JEDEC JS709A. Its DO-41 glass package contains no lead in solderable terminations, and material declarations confirm compliance with REACH SVHC thresholds for all substances of concern.
BZX85C6V8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 1.3 W
- Impedance (Max) (Zzt):
- 3.5 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 4 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41G
BZX85C6V8 FAQ
1.How can I place an order for BZX85C6V8 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C6V8 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 BZX85C6V8 reliable?
The price and inventory of BZX85C6V8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C6V8 is usually 5 days.
3.What payment methods are accepted for BZX85C6V8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C6V8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C6V8?
BZX85C6V8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C6V8 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 BZX85C6V8?
For technical support, including BZX85C6V8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C6V8 requirements.
6.How does Aetrix verify that BZX85C6V8 is sourced from the original manufacturer or authorized distributors?
All BZX85C6V8 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 BZX85C6V8 meets industry standards.
7.What is the process for return or replacement of BZX85C6V8?
All BZX85C6V8 units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C6V8, 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 BZX85C6V8 part is unused and in its original packaging.
Return procedure for BZX85C6V8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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