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Renesas RD6.8JS-AZ
- Part No.:
- RD6.8JS-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD6.8JS-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:14,800
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Product details
Overview
RD6.8JS-AZ from Renesas Electronics is a 400 mW, DO-34 glass-sealed Zener diode with nominal zener voltage 6.8 V (±5% tolerance at 5 mA), low noise performance, sharp breakdown characteristic, and dynamic impedance of 15 Ω at 5 mA - used for precision voltage reference and waveform clipping in analog signal conditioning circuits.
For engineers reviewing the RD6.8JS-AZ datasheet, RD6.8JS-AZ pinout, RD6.8JS-AZ application, or RD6.8JS-AZ equivalent, key selection criteria include zener voltage tolerance (±5%), knee impedance (1.5 Ω at 0.5 mA), reverse current limit (0.5 µA at 3.5 V), thermal resistance (375 °C/W), and DO-34 package compatibility with through-hole PCB layouts.
Technical Context
This device operates as a two-terminal voltage-reference element relying on controlled avalanche breakdown in silicon. Its DHD (Double Heatsink Diode) construction within the DO-34 package enables stable 400 mW power dissipation up to 175 °C junction temperature while maintaining low noise (<50 µV RMS, f = 10–500 kHz) and tight voltage regulation.
The RD6.8JS-AZ exhibits a positive temperature coefficient of +0.04 %/°C near 6.8 V, making it suitable for temperature-compensated references when paired with negative-TC components. Its surge reverse power rating is 2.4 W for 10 µs pulses, supporting transient overvoltage protection in low-energy clamp circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 6.47–6.73 V at IZ = 5 mA - defines stable regulation point for biasing or reference applications |
| Dynamic Impedance Zz | 15 Ω at IZ = 5 mA - determines output voltage variation under load current changes |
| Knee Impedance Zzk | 1.5 Ω at IZ = 0.5 mA - indicates low-voltage regulation capability near turn-on threshold |
| Reverse Current IR | 0.5 µA max at VR = 3.5 V - ensures minimal leakage in high-impedance sensing nodes |
| Power Dissipation P | 400 mW at TA = 25 °C - sets maximum continuous DC power handling on standard PCB copper |
| Surge Power PRSM | 2.4 W for t = 10 µs - supports short-duration overvoltage clamping without failure |
| Junction Temperature Tj | 175 °C - defines upper thermal limit for reliable long-term operation |
Pinout & Package
RD6.8JS-AZ uses the DO-34 (JEDEC) axial glass package with cathode indicated by a blue band. It has two terminals: anode and cathode - no internal connections or control pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode | Zener breakdown terminal | Marked with blue band; connected to higher-potential node to enable regulated voltage drop |
Key Features
| Feature | Design Value |
|---|---|
| Low noise operation | Typical noise level ≤50 µV RMS (10–500 kHz), enabling use in precision analog references |
| Sharp breakdown characteristic | Knee voltage well-defined at 3.5 V with IR = 0.5 µA, supporting clean clamping in signal paths |
| DHD construction | Double heatsink design improves thermal dissipation in DO-34 package, sustaining 400 mW rating |
| E24-standard voltage grading | VZ conforms to E24 series (6.8 V nominal), simplifying BOM standardization across designs |
| RoHS-compliant glass seal | Lead-free DO-34 package meets EU RoHS Directive requirements for commercial electronics |
Applications
| Audio Signal Clipping | Op-Amp Reference Biasing |
|---|---|
|
Use Scenario: Limiting peak amplitude in line-level audio preamplifier stages to prevent distortion. IC Role / Device Role / Timing Role: Passive voltage clamp placed across op-amp feedback path to define symmetric ±6.8 V hard limit. Use Value: Sharp breakdown ensures consistent clipping threshold; low noise avoids audible artifacts in analog signal chain. |
Use Scenario: Providing stable bias voltage for rail-to-rail input op-amps in sensor interface circuits. IC Role / Device Role / Timing Role: Zener reference connected to non-inverting input via high-value resistor to set common-mode voltage. Use Value: 15 Ω dynamic impedance minimizes drift under varying load currents; DO-34 footprint allows compact layout. |
| Power Supply Overvoltage Protection | Waveform Shaping in Function Generators |
|
Use Scenario: Protecting 5 V logic rails from transient spikes during hot-plug events in industrial controllers. IC Role / Device Role / Timing Role: Connected between VCC and GND with series current-limiting resistor to clamp surges above 6.8 V. Use Value: 2.4 W surge rating handles 10 µs transients; 175 °C Tj rating supports operation in enclosed enclosures. |
Use Scenario: Generating square-wave harmonics by clipping sine-wave oscillator outputs in test equipment. IC Role / Device Role / Timing Role: Bidirectional clipping pair (two RD6.8JS-AZ back-to-back) shaping zero-crossing symmetry. Use Value: Matched VZ tolerance (±5%) ensures balanced positive/negative clipping thresholds; low capacitance preserves high-frequency fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4734A | 6.8 V nominal, 1 W rating, DO-41 package, Zz = 5 Ω at 45 mA | Higher power handling but larger footprint and different thermal profile | Select when >400 mW continuous dissipation is required and board space permits DO-41 |
| BZX55C6V8 | 6.8 V nominal, 500 mW rating, DO-35 package, Zz = 10 Ω at 5 mA | Slightly higher power rating and tighter VZ tolerance (±5% same), but different package geometry | Select when DO-35 is preferred for automated assembly or when marginally lower Zz is critical |
Compared with RD6.8JS-AZ, the 1N4734A offers higher surge capacity and power rating but requires PCB redesign for DO-41; the BZX55C6V8 provides similar electrical behavior in a smaller DO-35 package but lacks the DHD thermal structure for sustained 400 mW operation.
Availability
RD6.8JS-AZ is available at Aetrix Electronics and suitable for audio signal conditioning, op-amp biasing, and overvoltage protection circuits requiring stable component supply and legacy-compatible DO-34 packaging.
Supply support for RD6.8JS-AZ 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 manufacturer headquartered in Japan, specializing in microcontrollers, analog and power devices, and system-on-chip solutions for industrial, automotive, and consumer markets.
The RD6.8JS-AZ belongs to the RDx.xJS series of low-noise Zener diodes designed for precision voltage reference and waveform shaping in commercial-grade analog circuits where stability, sharp knee characteristics, and DO-34 compatibility are essential.
FAQ
What is the zener voltage tolerance of RD6.8JS-AZ at 5 mA?
The RD6.8JS-AZ has a zener voltage range of 6.47 V to 6.73 V at test current IZ = 5 mA, corresponding to ±5% tolerance around the nominal 6.8 V rating. This tolerance is specified per the E24 standard and verified under pulse-test conditions (40 ms duration) per Renesas datasheet D13937EJ5V0DS00.
Can RD6.8JS-AZ be used in surface-mount designs?
No - RD6.8JS-AZ is packaged exclusively in the axial DO-34 glass case with leaded terminations, intended for through-hole mounting. It is not compatible with SMT reflow or pick-and-place processes. For surface-mount equivalents, consider the BZX84-C6V8 (SOT-23) or MMBZ5236B (SOT-23), though electrical and thermal performance differs.
What is the maximum reverse current guaranteed for RD6.8JS-AZ at 3.5 V?
The RD6.8JS-AZ guarantees a maximum reverse current IR of 0.5 µA at VR = 3.5 V and TA = 25 °C. This low leakage supports high-impedance reference nodes and precision biasing where minimal current draw is critical to circuit accuracy.
Does RD6.8JS-AZ meet RoHS requirements?
Yes - RD6.8JS-AZ uses a lead-free glass seal and complies with the EU RoHS Directive, as confirmed by Renesas Electronics' environmental compliance documentation. The DO-34 package contains no restricted substances above allowable thresholds and is rated for commercial-grade applications.
How does the thermal resistance of RD6.8JS-AZ affect its power derating?
RD6.8JS-AZ has a junction-to-ambient thermal resistance Rth of 375 °C/W on standard PCB copper. At ambient temperatures above 25 °C, its 400 mW rating must be linearly derated - e.g., at 75 °C ambient, maximum dissipation drops to 200 mW. Derating follows the curve in Figure 5 of datasheet D13937EJ5V0DS00.
RD6.8JS-AZ 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:
- -
RD6.8JS-AZ FAQ
1.How can I place an order for RD6.8JS-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD6.8JS-AZ 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 RD6.8JS-AZ reliable?
The price and inventory of RD6.8JS-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD6.8JS-AZ is usually 5 days.
3.What payment methods are accepted for RD6.8JS-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD6.8JS-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD6.8JS-AZ?
RD6.8JS-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD6.8JS-AZ 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 RD6.8JS-AZ?
For technical support, including RD6.8JS-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD6.8JS-AZ requirements.
6.How does Aetrix verify that RD6.8JS-AZ is sourced from the original manufacturer or authorized distributors?
All RD6.8JS-AZ 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 RD6.8JS-AZ meets industry standards.
7.What is the process for return or replacement of RD6.8JS-AZ?
All RD6.8JS-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD6.8JS-AZ, 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 RD6.8JS-AZ part is unused and in its original packaging.
Return procedure for RD6.8JS-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD6.8JS-AZ Tags
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