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onsemi BZX79C6V8-T50A
- Part No.:
- BZX79C6V8-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C6V8-T50A.pdf
- Description:
- DIODE ZENER 6.8V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:9,840
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Product details
Overview
BZX79C6V8-T50A from ON Semiconductor is a 6.8 V, 5% tolerance, 500 mW DO-35 glass-case Zener diode optimized for voltage regulation and reference applications in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.
For engineers reviewing the BZX79C6V8-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy at 5 mA test current, dynamic impedance of 15 Ω max, temperature coefficient of +1.2 mV/°C, and leakage current ≤2 μA at 4 V reverse bias.
Technical Context
This discrete Zener diode operates in reverse breakdown mode with a nominal zener voltage of 6.8 V at IZ = 5 mA. Its DO-35 axial glass package supports lead-free soldering and meets industrial temperature requirements from −65 °C to +200 °C.
The device exhibits a positive temperature coefficient (+1.2 mV/°C), indicating increasing zener voltage with rising junction temperature - a critical factor when used in precision references across wide ambient ranges or in thermally coupled feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.4 V to 7.2 V at IZ = 5 mA - defines stable regulation window for feedback or clamping |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75 °C - sets maximum continuous DC power handling in standard leaded layout |
| Dynamic Impedance (ZZ) | ≤15 Ω at IZ = 5 mA - determines output voltage stability under load transients |
| Leakage Current (IR) | ≤2 μA at VR = 4 V - ensures minimal error current in high-impedance reference nodes |
| Temperature Coefficient (TC) | +1.2 mV/°C - quantifies drift direction and magnitude per degree Celsius rise |
| Junction Temperature Range | −65 °C to +200 °C - enables operation in harsh environments including automotive under-hood and industrial motor controls |
Pinout & Package
DO-35 glass axial package with cathode indicated by a color band on the body; two-terminal device requiring no external biasing circuitry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference node | Connected to lower-potential side in regulation; forms reference ground return path |
| Cathode | Zener voltage reference terminal / Breakdown anode | Marked with color band; connected to regulated output or feedback point in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables predictable regulation without post-production trimming in cost-sensitive consumer and industrial designs |
| Low dynamic impedance (15 Ω max) | Maintains tight output voltage under varying load currents up to 50 mA in shunt regulator topologies |
| Positive TC (+1.2 mV/°C) | Compensates for negative TC of other components (e.g., BJTs) in temperature-stable reference circuits |
| DO-35 glass package | Provides hermetic sealing and long-term reliability in humid or chemically aggressive environments |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Used in TL431-based adjustable SMPS feedback networks to set precise output voltage thresholds. IC Role / Device Role / Timing Role: Provides stable 6.8 V reference to bias the TL431's reference input, enabling accurate output regulation. Use Value: Tight 5% VZ tolerance and low ZZ ensure ±1% output voltage accuracy across line/load/temperature variations. | Use Scenario: Placed across microcontroller I/O pins to limit transient-induced overvoltage during ESD events. IC Role / Device Role / Timing Role: Acts as a passive shunt clamp, conducting above 7.2 V to divert surge current away from sensitive inputs. Use Value: Low leakage (<2 μA) avoids signal loading; fast response protects against sub-100 ns transients without active control. |
| Voltage Reference | Signal Level Shifting |
Use Scenario: Supplies reference voltage to ADC input buffers in battery-powered sensor nodes. IC Role / Device Role / Timing Role: Serves as a low-cost, low-current precision reference source for analog front-end scaling. Use Value: Stable +1.2 mV/°C TC allows predictable calibration offset correction in firmware across operating temperature range. | Use Scenario: Shifts logic-level signals between 5 V and 3.3 V domains in mixed-voltage digital interfaces. IC Role / Device Role / Timing Role: Functions as a bidirectional level translator via series resistor + Zener clamping topology. Use Value: 6.8 V breakdown enables safe clamping of 5 V signals while preserving 3.3 V logic thresholds with minimal propagation delay. |
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 rating, but 5% tolerance and 1.0 W power rating in DO-41 package | Higher power dissipation supports higher current regulation; larger DO-41 footprint requires PCB redesign | Select when >500 mW continuous power or improved thermal margin is required |
| BZX55C6V8 | Same 6.8 V/5%/500 mW spec, but DO-35 package with different marking and tighter ZZ (10 Ω max) | Lower dynamic impedance improves regulation accuracy in precision references | Prefer for high-stability analog references where <10 Ω ZZ reduces output ripple sensitivity |
Compared with BZX79C6V8-T50A, the 1N4734A offers higher power handling at the cost of larger size, while the BZX55C6V8 delivers lower dynamic impedance in the same DO-35 form factor - making it suitable for noise-sensitive reference designs where regulation fidelity outweighs legacy compatibility.
Availability
BZX79C6V8-T50A is available at Aetrix Electronics and suitable for voltage regulation, overvoltage protection, and precision reference applications requiring stable component supply across industrial automation, consumer power adapters, and embedded sensor systems.
Supply support for BZX79C6V8-T50A 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The BZX79C series was designed for general-purpose voltage regulation and reference functions in cost-sensitive, space-constrained applications where DO-35 packaging and tight zener tolerance deliver optimal performance-to-size ratio.
FAQ
What is the zener voltage tolerance of the BZX79C6V8-T50A?
The BZX79C6V8-T50A has a zener voltage tolerance of ±5%, meaning its actual breakdown voltage falls between 6.4 V and 7.2 V when tested at 5 mA. This tolerance is specified at 25 °C and applies across the full operating temperature range, supporting consistent performance in uncalibrated analog circuits without trimming.
Does the BZX79C6V8-T50A have a cathode marking, and how is it identified?
Yes, the BZX79C6V8-T50A uses a color band on the glass body to denote the cathode terminal. Per ON Semiconductor documentation, this band is located near one end of the DO-35 package and must be oriented toward the higher-potential side in shunt regulation configurations. The anode is the unmarked end.
What is the maximum power dissipation for the BZX79C6V8-T50A, and at what condition?
The BZX79C6V8-T50A has a maximum power dissipation of 500 mW at lead temperature (TL) ≤ 75 °C with 3/8″ lead length. Above 75 °C, it derates linearly at 4.0 mW/°C - a critical parameter for thermal design in enclosed or high-ambient environments.
How does the temperature coefficient affect the BZX79C6V8-T50A's performance in precision circuits?
The BZX79C6V8-T50A has a temperature coefficient of +1.2 mV/°C, meaning its zener voltage increases by approximately 1.2 mV per degree Celsius rise in junction temperature. In precision references, this drift must be compensated in system-level calibration or paired with complementary-TC components to maintain stability across −40 °C to +85 °C operating ranges.
Can the BZX79C6V8-T50A be used in place of the BZX55C6V8?
The BZX79C6V8-T50A and BZX55C6V8 share identical nominal voltage (6.8 V), tolerance (5%), power rating (500 mW), and DO-35 package, but differ in dynamic impedance (15 Ω vs. 10 Ω max) and leakage current (2 μA vs. 1 μA max at 4 V). They are functionally interchangeable in most applications, though BZX55C6V8 offers tighter regulation in high-precision references.
BZX79C6V8-T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- 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:
- 500 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 4 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 100 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
BZX79C6V8-T50A FAQ
1.How can I place an order for BZX79C6V8-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C6V8-T50A 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 BZX79C6V8-T50A reliable?
The price and inventory of BZX79C6V8-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C6V8-T50A is usually 5 days.
3.What payment methods are accepted for BZX79C6V8-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C6V8-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C6V8-T50A?
BZX79C6V8-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C6V8-T50A 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 BZX79C6V8-T50A?
For technical support, including BZX79C6V8-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C6V8-T50A requirements.
6.How does Aetrix verify that BZX79C6V8-T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C6V8-T50A 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 BZX79C6V8-T50A meets industry standards.
7.What is the process for return or replacement of BZX79C6V8-T50A?
All BZX79C6V8-T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C6V8-T50A, 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 BZX79C6V8-T50A part is unused and in its original packaging.
Return procedure for BZX79C6V8-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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