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Renesas RD6.8F-T8
- Part No.:
- RD6.8F-T8
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD6.8F-T8.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:2,747
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Product details
Overview
RD6.8F-T8 from Renesas Electronics is a 1 W planar silicon Zener diode in DO-41 glass-sealed DHD package, rated for 6.35–7.10 V zener voltage at 40 mA test current, with 6 Ω dynamic impedance and +3.0 mV/°C temperature coefficient. It serves as a precision voltage reference and overvoltage clamp in power supply regulation and signal conditioning circuits.
For engineers reviewing the RD6.8F-T8 datasheet, RD6.8F-T8 pinout, RD6.8F-T8 application, or RD6.8F-T8 equivalent, key selection criteria include its ±5% zener tolerance (B grade), 40 μA reverse leakage at 3.5 V, 175°C maximum junction temperature, and suitability for surge absorption and waveform limiting in industrial control and consumer power rails.
Technical Context
This device operates as a two-terminal voltage-regulating element relying on controlled reverse breakdown. Its planar DHD structure enables stable thermal performance with 20 mm² minimum heatsink area for full 1 W dissipation at 25°C ambient.
The RD6.8F-T8 exhibits positive temperature coefficient (+3.0 mV/°C) above ~5 V, enabling predictable drift compensation in reference designs. Its 6 Ω dynamic impedance at 40 mA ensures low output impedance under regulation, supporting stable biasing in analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.35–7.10 V at IZ = 40 mA - defines nominal regulation point with ±5% tolerance for B-grade parts |
| Power Dissipation (P) | 1.0 W - maximum continuous DC power at TA = 25°C; derates linearly above 25°C per Figure 1 |
| Dynamic Impedance (ZZ) | 6 Ω at IZ = 40 mA - indicates low AC impedance during regulation, critical for ripple rejection |
| Reverse Leakage (IR) | 20 μA max at VR = 3.5 V - ensures minimal standby current in clamping applications |
| Temp. Coefficient (γZ) | +3.0 mV/°C typical - enables predictable voltage drift for temperature-compensated references |
| Junction Temperature (Tj) | 175°C max - sets upper thermal limit for reliability in enclosed or high-ambient environments |
| Surge Power (PRSM) | 400 W for t = 10 μs - supports transient overvoltage suppression without failure |
Pinout & Package
RD6.8F-T8 uses a DO-41 axial glass package with cathode indicated by a black band. The device has two terminals: anode and cathode - no internal connections or multi-pin functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-bias regulation; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node; sustains regulated reverse voltage |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage range (2–82 V) | Enables single-family standardization across diverse regulation requirements without redesign |
| E24 series nominal values | Ensures compatibility with standard resistor/capacitor value planning and inventory management |
| Planar DHD glass-sealed structure | Delivers stable long-term zener voltage stability and robust moisture resistance in humid environments |
| 1 W power rating with DO-41 footprint | Provides higher power handling than sub-500 mW Zeners while maintaining legacy through-hole compatibility |
| Positive tempco above 5 V | Allows pairing with negative-tempco components (e.g., transistors) to achieve near-zero-drift references |
Applications
| Power Supply Regulation | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing 5 V or 6 V rail in microcontroller-based industrial sensors. IC Role / Device Role: Two-terminal shunt voltage reference providing precise bias for LDO feedback or ADC reference dividers. Use Value: Maintains ±1% output accuracy over temperature due to predictable +3.0 mV/°C drift and low 6 Ω dynamic impedance. |
Use Scenario: Clamping input lines of RS-485 transceivers against ESD and lightning-induced surges. IC Role / Device Role: Passive overvoltage clamp absorbing transient energy before it reaches sensitive IC inputs. Use Value: Withstands 400 W surge pulses (10 μs) and limits voltage to ≤7.1 V, protecting downstream logic. |
| Waveform Limiting | Constant-Current Biasing |
Use Scenario: Shaping audio signal peaks in analog mixer output stages. IC Role / Device Role: Symmetrical clipping element in back-to-back configuration with another RD6.8F-T8. Use Value: Sharp 6.35–7.10 V knee enables clean, repeatable amplitude limiting without soft saturation. |
Use Scenario: Setting bias current for LED drivers or phototransistor amplifiers. IC Role / Device Role: Stable current source formed with series resistor, leveraging constant VZ across operating range. Use Value: Delivers <1% current variation over 10–100 mA load range due to low ZZ and tight VZ tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4734A (ON Semiconductor) | 6.2 V nominal, ±5%, 1.3 W rating, DO-41, ZZ = 7 Ω at 41 mA | Slightly lower VZ and higher power; marginally higher dynamic impedance | Select when 6.2 V regulation is acceptable and higher surge margin is needed. |
| BZX55C6V8 (Vishay) | 6.8 V nominal, ±5%, 500 mW rating, DO-35, ZZ = 10 Ω at 20 mA | Lower power rating and higher ZZ; smaller DO-35 package limits thermal performance | Choose only for space-constrained low-power designs where 1 W dissipation is unnecessary. |
Compared with RD6.8F-T8, the 1N4734A offers higher surge resilience but shifts regulation downward by 0.2 V, while the BZX55C6V8 sacrifices thermal capability and regulation stiffness for footprint reduction - making RD6.8F-T8 optimal for 1 W-stable 6.8 V reference needs in industrial PCBs.
Availability
RD6.8F-T8 is available at Aetrix Electronics and suitable for power supply regulation, overvoltage protection, and waveform limiting requiring stable component supply and long-lifecycle support.
Supply support for RD6.8F-T8 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.
The RD6.8F-T8 belongs to Renesas' legacy planar Zener diode family designed for general-purpose voltage regulation and transient suppression in cost-sensitive, high-reliability industrial equipment.
FAQ
What is the exact zener voltage range for RD6.8F-T8 at 40 mA?
The RD6.8F-T8 has a guaranteed zener voltage range of 6.35 V to 7.10 V when tested at IZ = 40 mA and TA = 25°C. This corresponds to the B-grade tolerance (±5%) specified in the D13936EJ5V0DS datasheet, with the nominal 6.8 V representing the center of that band. The RD6.8F-T8 maintains this specification across its qualified operating temperature range.
Does RD6.8F-T8 have a cathode marking, and how is it identified?
Yes, RD6.8F-T8 features a cathode identification mark: a black band printed on the glass body near one end. This band denotes the cathode terminal, which must be connected to the higher-potential side of the circuit during reverse-bias operation. The anode is the unmarked lead, and the device is not polarity-reversible in regulation mode.
What is the maximum allowable reverse leakage current for RD6.8F-T8?
The RD6.8F-T8 specifies a maximum reverse leakage current (IR) of 20 μA at VR = 3.5 V and TA = 25°C. This value is measured well below the zener knee and confirms low standby power draw in clamping or reference configurations where the device remains below conduction threshold.
Can RD6.8F-T8 be used in parallel for higher current handling?
No - RD6.8F-T8 should not be operated in parallel without external balancing resistors. Due to manufacturing variations in zener voltage (±5%), paralleling units causes current hogging, where the lowest-VZ unit conducts most of the current and risks thermal runaway. For higher current, use a single higher-power Zener or active regulation instead.
Is RD6.8F-T8 compliant with RoHS and lead-free assembly processes?
Yes, RD6.8F-T8 meets EU RoHS Directive requirements. As confirmed by Renesas Electronics' environmental compliance documentation, the device contains no restricted substances above threshold limits and is compatible with lead-free reflow soldering profiles, including peak temperatures up to 260°C for 10 seconds.
RD6.8F-T8 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-T8 FAQ
1.How can I place an order for RD6.8F-T8 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD6.8F-T8 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-T8 reliable?
The price and inventory of RD6.8F-T8 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-T8 is usually 5 days.
3.What payment methods are accepted for RD6.8F-T8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD6.8F-T8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD6.8F-T8?
RD6.8F-T8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD6.8F-T8 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-T8?
For technical support, including RD6.8F-T8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD6.8F-T8 requirements.
6.How does Aetrix verify that RD6.8F-T8 is sourced from the original manufacturer or authorized distributors?
All RD6.8F-T8 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-T8 meets industry standards.
7.What is the process for return or replacement of RD6.8F-T8?
All RD6.8F-T8 units undergo pre-shipment inspection (PSI). If there is an issue with RD6.8F-T8, 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-T8 part is unused and in its original packaging.
Return procedure for RD6.8F-T8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD6.8F-T8 Tags
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