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onsemi BZX84C6V8
- Part No.:
- BZX84C6V8
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
BZX84C6V8.pdf
- Description:
- DIODE ZENER 6.8V 250MW
- Quantity:
- Payment:
- Shipping:
Inventory:83,545
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Product details
Overview
BZX84C6V8 from Fairchild Semiconductor is a 6.8 V ±5% Zener diode in SOT-23 package, rated for 250 mW power dissipation at 25°C ambient, with 15 Ω dynamic impedance at 5 mA and 2 µA maximum reverse leakage at 4.0 V. It provides precision voltage regulation in low-power biasing and reference circuits.
For engineers reviewing the BZX84C6V8 datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal resistance (RθJA = 465°C/W), junction temperature range (–55°C to +150°C), and SOT-23 footprint compatibility with space-constrained PCB layouts.
Technical Context
The BZX84C6V8 operates as a silicon planar epitaxial Zener diode optimized for stable voltage reference and overvoltage protection in DC supply rails. Its design targets low-current regulation (IZ = 1–20 mA) with tight 5% tolerance and predictable temperature coefficient (+1.2 mV/°C at 5 mA).
It exhibits 155 pF capacitance at 0 V reverse bias and 4.0 V test voltage, supporting moderate-frequency noise suppression without compromising transient response. The device uses cathode-anode polarity marking consistent with SOT-23 pin 1 (anode), pin 2 (cathode), pin 3 (anode) configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.4–7.2 V at IZ = 5 mA - defines nominal regulation point with ±5% tolerance |
| Zener Impedance (ZZ) | 15 Ω max at IZ = 5 mA - ensures minimal output voltage deviation under load variation |
| Reverse Leakage (IR) | 2 µA max at VR = 4.0 V - guarantees low standby current in high-impedance bias networks |
| Power Dissipation (PD) | 250 mW at TA = 25°C - sets maximum continuous power handling on standard FR-4 PCB |
| Junction Temp Range (TJ) | –55°C to +150°C - supports operation in industrial and automotive under-hood environments |
| Capacitance (Cap) | 155 pF at VR = 0 V, f = 1 MHz - limits high-frequency bypass effectiveness above ~10 MHz |
| Tempco (dVZ/dT) | +1.2 mV/°C at IZ = 5 mA - enables predictable drift compensation in temperature-sensitive references |
Pinout & Package
SOT-23 surface-mount package with gull-wing leads; standardized 3-pin outline (JEDEC TO-236AB), 1.3 mm × 2.9 mm footprint, 1.1 mm height. Cathode marked by band on top surface adjacent to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current during transient clamping |
| Pin 2 | Cathode | Marked terminal; connected to regulated voltage node; serves as reference output in shunt regulator topology |
| Pin 3 | Anode | Internally tied to Pin 1; provides mechanical stability and thermal path - must be routed to same net as Pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables accurate 6.8 V reference without post-production trimming in cost-sensitive consumer designs |
| Low 15 Ω dynamic impedance | Maintains regulation stability across ±1 mA load current changes in feedback divider networks |
| 155 pF junction capacitance | Permits effective RF decoupling up to ~10 MHz while avoiding resonance with typical PCB trace inductance |
| –55°C to +150°C operating range | Supports deployment in extended-temperature industrial controllers without derating or heatsinking |
| SOT-23 footprint compatibility | Allows drop-in replacement of other BZX84C-series devices and interoperability with automated pick-and-place equipment |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 6.8 V reference for op-amp comparators in isolated DC-DC feedback loops. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise threshold for error amplifier input. Use Value: 6.4–7.2 V regulation window and +1.2 mV/°C tempco enable <±2% total error over –40°C to +85°C ambient. | Use Scenario: Protecting microcontroller I/O pins from ESD-induced transients on 5 V logic lines. IC Role / Device Role / Timing Role: Fast-acting crowbar element diverting surge current when voltage exceeds 7.2 V. Use Value: 2 µA IR at 4.0 V ensures negligible quiescent loading; 15 Ω ZZ minimizes clamping overshoot during 8/20 µs surges. |
| ADC Voltage Reference | Current Source Bias |
Use Scenario: Generating fixed reference for 12-bit SAR ADC in battery-powered sensor nodes. IC Role / Device Role / Timing Role: Low-noise analog reference source replacing higher-cost bandgap ICs in low-speed acquisition. Use Value: 155 pF capacitance suppresses switching noise from digital sections; 250 mW rating supports 5 mA bias without thermal runaway. | Use Scenario: Setting constant base current for PNP transistor in linear LED driver stage. IC Role / Device Role / Timing Role: Stable voltage source defining emitter-base bias voltage for current mirror accuracy. Use Value: ±5% tolerance and 15 Ω ZZ ensure <±3% current variation across production lots and temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5235B (ON Semiconductor) | 6.8 V ±5%, 225 mW PD, 10 Ω ZZ at 20 mA, SOT-23 | Lower impedance at higher test current; slightly reduced power rating | Preferred where tighter regulation at >5 mA load is required; verify thermal margin at full 250 mW |
| 1N4734A (onsemi) | 6.8 V ±5%, 1 W PD, DO-41 through-hole, 5 Ω ZZ at 37 mA | Higher power, larger footprint, different mounting method | Selected for prototyping or high-reliability through-hole assemblies; not SMT-compatible |
Compared with MMBZ5235B and 1N4734A, the BZX84C6V8 offers optimal balance of SOT-23 miniaturization, 250 mW capability, and 15 Ω impedance at industry-standard 5 mA test condition - making it ideal for volume production of space-constrained, low-to-moderate power regulation tasks.
Availability
BZX84C6V8 is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and ADC voltage reference applications requiring stable component supply and consistent parametric performance across manufacturing lots.
Supply support for BZX84C6V8 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 acquired by ON Semiconductor in 2016, known for high-performance discrete and analog products with emphasis on power efficiency and reliability.
The BZX84C series belongs to Fairchild's general-purpose Zener diode product line, designed specifically for precision voltage regulation and transient suppression in compact, cost-sensitive consumer and industrial electronics.
FAQ
What is the nominal Zener voltage of the BZX84C6V8 and how tightly is it specified?
The BZX84C6V8 has a nominal Zener voltage of 6.8 V, specified as 6.4 V minimum to 7.2 V maximum at 5 mA test current. This ±5% tolerance is guaranteed across the full operating temperature range (–55°C to +150°C) and reflects the "C" grade tolerance per the BZX84 family designation. The BZX84C6V8 achieves this specification using planar epitaxial process control and laser trimming during final test.
Can the BZX84C6V8 be used in place of a 6.2 V or 7.5 V Zener diode?
No - the BZX84C6V8 is not interchangeable with BZX84C6V2 or BZX84C7V5 due to distinct voltage bands and differing temperature coefficients (+0.4 mV/°C for BZX84C6V2 vs. +1.2 mV/°C for BZX84C6V8). Substituting outside the 6.4–7.2 V range risks incorrect biasing or regulation failure. Always verify circuit headroom and thermal drift requirements before cross-referencing within the BZX84C series.
What is the maximum reverse leakage current for the BZX84C6V8 and at what voltage is it measured?
The BZX84C6V8 has a maximum reverse leakage current (IR) of 2 µA, measured at VR = 4.0 V and TA = 25°C. This value is confirmed in the Electrical Characteristics table on page 3 of the Fairchild BZX84C3V3–BZX84C33 datasheet Rev. 1.10. At voltages below 4.0 V, leakage remains well below this limit, supporting reliable operation in high-impedance sensing nodes.
Does the BZX84C6V8 have a defined forward voltage characteristic?
Yes - the BZX84C6V8 exhibits a maximum forward voltage (VF) of 0.9 V at IF = 10 mA, consistent across the entire BZX84 series. This parameter is specified in the "VF Forward Voltage" note on page 2 of the datasheet and applies under standard forward-bias conditions, enabling use as a low-drop rectifier or polarity protection element when operated in forward conduction mode.
How does thermal resistance affect the usable power dissipation of the BZX84C6V8 in real PCB layouts?
The BZX84C6V8 has RθJA = 465°C/W when mounted on a standard FR-4 PCB (76.2 mm × 114.3 mm). At 25°C ambient, this allows 250 mW dissipation before reaching the 150°C max junction temperature. In smaller boards or higher ambient temperatures, derating is required - e.g., at 70°C ambient, max safe PD drops to ~170 mW. The ψJL = 220°C/W value indicates superior heat transfer to the PCB copper via the cathode lead, guiding layout best practices.
BZX84C6V8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 4 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- -
BZX84C6V8 FAQ
1.How can I place an order for BZX84C6V8 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C6V8 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 BZX84C6V8 reliable?
The price and inventory of BZX84C6V8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C6V8 is usually 5 days.
3.What payment methods are accepted for BZX84C6V8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C6V8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C6V8?
BZX84C6V8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C6V8 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 BZX84C6V8?
For technical support, including BZX84C6V8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C6V8 requirements.
6.How does Aetrix verify that BZX84C6V8 is sourced from the original manufacturer or authorized distributors?
All BZX84C6V8 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 BZX84C6V8 meets industry standards.
7.What is the process for return or replacement of BZX84C6V8?
All BZX84C6V8 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C6V8, 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 BZX84C6V8 part is unused and in its original packaging.
Return procedure for BZX84C6V8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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