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Renesas RD6.8F(5)
- Part No.:
- RD6.8F(5)
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD6.8F(5).pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:3,500
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Product details
Overview
RD6.8F(5) from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed package, with nominal zener voltage 6.8 V (B3 grade: 6.74–7.10 V), dynamic impedance ≤6 Ω at 40 mA, reverse current ≤20 μA at 3.5 V, and positive temperature coefficient of +3.0 mV/°C. It serves as a precision voltage reference and overvoltage clamp in power supply feedback loops.
For engineers reviewing the RD6.8F(5) datasheet, RD6.8F(5) pinout, RD6.8F(5) application, or RD6.8F(5) equivalent, this part is selected for stable 6.8 V regulation in industrial power converters, analog sensor biasing circuits, and transient suppression where low dynamic impedance and predictable thermal drift are critical.
Technical Context
This Zener diode employs a planar junction structure with double heatsink (DHD) glass sealing for enhanced thermal reliability and consistent breakdown behavior. Its 1 W power rating is derated linearly above 25°C ambient per Figure 1, supporting operation up to 175°C junction temperature.
The B3 voltage grade ensures tight tolerance (±2.8% at 6.8 V), while the +3.0 mV/°C temperature coefficient enables predictable drift compensation in temperature-sensitive references. Dynamic impedance is measured under 40 mA DC bias with superimposed AC signal, confirming low noise performance in regulation applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.74–7.10 V (B3 grade); ensures ±2.8% tolerance at 40 mA test current for reliable voltage setting |
| Power Dissipation (P) | 1.0 W at TA = 25°C; supports continuous regulation in compact PCB layouts with adequate copper area |
| Dynamic Impedance (ZZ) | ≤6 Ω at IZ = 40 mA; minimizes output voltage variation under load transients in feedback networks |
| Reverse Current (IR) | ≤20 μA at VR = 3.5 V; guarantees low leakage in high-impedance bias and sensing circuits |
| Temp. Coefficient (γZ) | +3.0 mV/°C (typ.); enables predictable upward drift for temperature-compensated reference designs |
| Junction Temperature (Tj) | −65 to +175°C; allows deployment in extended-temperature industrial environments without derating penalties |
| Surge Power (PRSM) | 400 W (t = 10 μs); provides robust ESD and lightning-induced transient absorption capability |
Pinout & Package
RD6.8F(5) uses the JEDEC DO-41 axial glass package (3.0 mm diameter × 5.0 mm length), with cathode indicated by a black band. The device has two terminals: anode and cathode - no internal connections or multi-pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener operation; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node; defines regulated output voltage referenced to anode |
Key Features
| Feature | Design Value |
|---|---|
| Planar DHD glass construction | Enables 175°C max junction temperature and stable long-term Zener voltage stability under thermal cycling |
| E24-series voltage grading | Supports standardized B1/B2/B3 binning for precise system-level voltage matching across production lots |
| Low dynamic impedance | ≤6 Ω at 40 mA ensures minimal regulation error during fast load steps in SMPS feedback paths |
| Controlled positive tempco | +3.0 mV/°C allows pairing with negative-tempco components (e.g., resistors, BJTs) for zero-drift references |
| DO-41 mechanical compatibility | Standard axial footprint enables drop-in replacement in legacy designs using industry-common mounting and reflow profiles |
Applications
| Switch-Mode Power Supply Feedback | Sensor Bias Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converter secondary-side feedback loop. IC Role / Device Role / Timing Role: Zener diode provides precise 6.8 V reference to optocoupler LED anode, enabling accurate output voltage sensing and isolation. Use Value: Low ZZ (≤6 Ω) maintains regulation accuracy despite optocoupler CTR variation and transformer leakage effects. |
Use Scenario: Providing stable excitation voltage to bridge-based pressure or temperature sensors. IC Role / Device Role / Timing Role: RD6.8F(5) acts as a shunt reference, delivering constant 6.8 V to sensor Wheatstone bridge inputs independent of supply rail fluctuations. Use Value: Tight B3 tolerance (±2.8%) and +3.0 mV/°C tempco allow predictable calibration offset correction across −40°C to +85°C. |
| Overvoltage Clamp Circuit | Waveform Limiter in Signal Conditioning |
Use Scenario: Protecting microcontroller GPIO pins or ADC inputs from transient overvoltage events. IC Role / Device Role / Timing Role: RD6.8F(5) clamps input voltage to ~7.1 V (max B3), diverting surge current away from sensitive downstream circuitry. Use Value: 400 W surge rating (10 μs) absorbs IEC 61000-4-5 Level 3 surges without degradation or parametric shift. |
Use Scenario: Limiting audio or instrumentation signal peaks to prevent amplifier saturation or ADC clipping. IC Role / Device Role / Timing Role: Connected in anti-parallel configuration to clip both positive and negative signal excursions beyond ±6.8 V. Use Value: Low ZZ ensures sharp, repeatable clipping threshold with minimal distortion in high-fidelity analog paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5233BS | Surface-mount SOD-123 package; 6.8 V nominal, 500 mW rating; ZZ = 10 Ω @ 20 mA | Lower power and smaller footprint; unsuitable for 1 W continuous dissipation or high-surge scenarios | Select when board space is constrained and peak power < 0.5 W; verify thermal pad layout for 200°C/W junction-to-board resistance |
| Vishay 1N4734A | DO-41 package; 6.8 V nominal, 1 W rating; ZZ = 5 Ω @ 40 mA; γZ = +2.5 mV/°C (slightly lower tempco) | Nearly identical electrical specs and form factor; RoHS-compliant version available | Drop-in alternative for legacy designs requiring same mechanical fit and thermal profile; confirm B3-grade tolerance match via vendor datasheet |
Compared with RD6.8F(5), MMBZ5233BS trades power handling and surge robustness for miniaturization, while 1N4734A offers functionally equivalent performance in the same DO-41 package but with marginally lower temperature coefficient - making it suitable for direct replacement where B3-grade tolerance alignment is verified.
Availability
RD6.8F(5) is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and transient protection circuits requiring stable component supply and long-lifecycle support.
Supply support for RD6.8F(5) 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
Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
RD6.8F(5) belongs to Renesas' legacy planar Zener diode family designed for high-reliability voltage reference and protection in standard-grade industrial equipment - emphasizing thermal stability, tight voltage binning, and robust surge immunity.
FAQ
What is the exact zener voltage tolerance for RD6.8F(5)?
The RD6.8F(5) is specified in the B3 voltage grade, with a minimum zener voltage of 6.74 V and maximum of 7.10 V at 40 mA test current - corresponding to a ±2.8% tolerance around the nominal 6.8 V value. This binning is confirmed in the Renesas D13936EJ5V0DS datasheet, Table on page 3.
Does RD6.8F(5) support surface-mount assembly?
No, RD6.8F(5) uses the axial DO-41 glass package and is not compatible with surface-mount reflow processes. It requires through-hole mounting and wave or selective soldering. For SMT alternatives, consider ON Semiconductor's MMBZ5233BS or Diodes Inc.'s BZX84-C6V8, though both are rated at 300–500 mW.
What is the maximum allowable surge power for RD6.8F(5)?
RD6.8F(5) supports a surge reverse power of 400 W for pulse width t = 10 μs, as defined in the Absolute Maximum Ratings table (page 2 of D13936EJ5V0DS). This rating applies under non-repetitive conditions and assumes proper heat sinking to avoid junction temperature exceedance.
Can RD6.8F(5) be used in automotive applications?
RD6.8F(5) is classified as a "Standard" quality grade device per Renesas documentation, intended for computers, office equipment, and industrial robots - not automotive systems. For AEC-Q200 qualified Zeners, consider Vishay's BZX84-A6V8 or Nexperia's PZTA42, which undergo stress testing for automotive temperature and vibration requirements.
How does the temperature coefficient of RD6.8F(5) affect circuit design?
The RD6.8F(5) exhibits a typical zener voltage temperature coefficient of +3.0 mV/°C, meaning its breakdown voltage increases predictably with temperature. This allows designers to compensate for negative tempcos elsewhere (e.g., in resistor dividers or op-amp inputs) to achieve near-zero net drift in precision reference circuits across operating temperature ranges.
RD6.8F(5) Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
RD6.8F(5) FAQ
1.How can I place an order for RD6.8F(5) through Aetrix?
Please submit a Request for Quotation (RFQ) for RD6.8F(5) 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 RD6.8F(5) reliable?
The price and inventory of RD6.8F(5) are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD6.8F(5) is usually 5 days.
3.What payment methods are accepted for RD6.8F(5)?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD6.8F(5) transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD6.8F(5)?
RD6.8F(5) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD6.8F(5) 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 RD6.8F(5)?
For technical support, including RD6.8F(5) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD6.8F(5) requirements.
6.How does Aetrix verify that RD6.8F(5) is sourced from the original manufacturer or authorized distributors?
All RD6.8F(5) 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 RD6.8F(5) meets industry standards.
7.What is the process for return or replacement of RD6.8F(5)?
All RD6.8F(5) units undergo pre-shipment inspection (PSI). If there is an issue with RD6.8F(5), 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 RD6.8F(5) part is unused and in its original packaging.
Return procedure for RD6.8F(5):
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD6.8F(5) Tags
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