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Renesas RD68F-T7-AZ
- Part No.:
- RD68F-T7-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD68F-T7-AZ.pdf
- Description:
- DIODE ZENER
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Product details
Overview
RD68F-T7-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode with a nominal zener voltage of 68 V (B grade: 64–72 V), dynamic impedance of 70 Ω at 10 mA, and temperature coefficient of +52 mV/°C. It features a DO-41 glass-sealed DHD (Double Heatsink Diode) package and is rated for surge reverse power up to 400 W (t = 10 μs). It is used in precision voltage regulation and transient suppression circuits in industrial power supplies.
For engineers reviewing the RD68F-T7-AZ datasheet, RD68F-T7-AZ pinout, RD68F-T7-AZ application, or RD68F-T7-AZ equivalent, this page delivers verified electrical parameters, JEDEC DO-41 terminal mapping, thermal derating curves, real-world clipping/limiter use cases, and two validated alternative Zener diodes with comparable voltage tolerance and power handling.
Technical Context
This device operates as a two-terminal voltage reference and clamp element, relying on controlled avalanche breakdown in its planar-junction structure. Its 1 W steady-state power rating is thermally limited by ambient temperature and PCB copper area, with derating beginning at 50°C per Figure 1 of D13936EJ5V0DS.
The B-grade tolerance (±5.9% at 68 V) reflects composite binning across B1–B3 subgrades, and its +52 mV/°C temperature coefficient indicates positive drift - critical for temperature-stable bias networks where compensation is required. Reverse leakage remains ≤5 μA at VR = 52 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 64–72 V (B grade, tested at 40 ms after power-on; defines regulation window under 10 mA test current) |
| Power Dissipation (P) | 1.0 W at TA = 25°C; derates linearly to zero at TA = 150°C with 5 mm PCB copper area |
| Dynamic Impedance (ZZ) | 70 Ω max at IZ = 10 mA; determines output voltage variation under load current changes |
| Reverse Current (IR) | ≤5 μA at VR = 52 V; ensures low standby leakage in high-impedance bias networks |
| Temperature Coefficient (γZ) | +52 mV/°C typical at IZ = 10 mA; requires thermal compensation in precision references |
| Surge Reverse Power (PRSM) | 400 W for t = 10 μs (non-repetitive); enables single-event transient suppression without clamping failure |
| Junction Temperature (Tj) | 175°C maximum; sets upper limit for thermal design margin in enclosed power modules |
Pinout & Package
RD68F-T7-AZ uses a JEDEC DO-41 axial-leaded 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 functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit ground or lower-potential rail; forms return path during forward bias or zener regulation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input voltage source; maintains stable ~68 V drop when reverse-biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| Planar junction construction | Enables tight VZ tolerance control and stable long-term regulation performance vs. alloyed diodes |
| DHD (Double Heatsink Diode) structure | Improves thermal resistance by ~25% over standard DO-41, supporting higher average power in compact layouts |
| E24-series voltage grading | Ensures compatibility with standard resistor/capacitor value sets for predictable feedback network design |
| B-grade composite binning (B1–B3) | Allows selective sourcing of tighter subgrades (e.g., B3: 67.4–71.0 V) without redesigning PCB footprints |
| 175°C maximum junction temperature | Supports operation in sealed industrial enclosures with ambient temperatures up to 100°C when properly heatsinked |
Applications
| Voltage Reference for Op-Amp Bias Networks | Overvoltage Clamp in DC-DC Converter Feedback Loops |
|---|---|
Use Scenario: Stable 68 V reference for rail-to-rail op-amp input biasing in high-voltage sensor signal conditioning. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing fixed bias point independent of supply ripple. Use Value: Maintains <±1.5% output stability over −40°C to +85°C due to predictable +52 mV/°C TC and low ZZ. |
Use Scenario: Clamping feedback node of a 72 V-output flyback controller to prevent regulator runaway during transient overloads. IC Role / Device Role / Timing Role: Shunt protection element that activates only above 68 V, preserving normal regulation below threshold. Use Value: Absorbs 400 W surge energy (10 μs) without degradation, eliminating need for external TVS in cost-sensitive designs. |
| Waveform Limiter in Analog Front-Ends | Surge Suppression in Industrial 48 V Rail Interfaces |
Use Scenario: Symmetrical clipping of ±70 V transients on analog acquisition inputs before ADC drivers. IC Role / Device Role / Timing Role: Bidirectional limiter (with series diode) limiting peak excursions to ±68 V ±5.9%. Use Value: Dynamic impedance of 70 Ω ensures <0.7 V overshoot at 100 mA transient, preserving signal integrity. |
Use Scenario: Protection of RS-485 transceivers and PLC I/O circuits connected to unregulated 48 V field power. IC Role / Device Role / Timing Role: Primary shunt suppressor absorbing induced lightning surges on long cable runs. Use Value: Withstands 400 W non-repetitive surges while maintaining <5 μA leakage at 52 V - minimizing standby power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor 1N4749A | 68 V nominal, ±5% tolerance (tighter than RD68F-T7-AZ B grade), ZZ = 40 Ω max at 34 mA, DO-41 package | Lower ZZ improves regulation accuracy but requires higher test current; less suitable for low-current bias networks | Select when tighter voltage tolerance and lower dynamic impedance are prioritized over low-leakage operation at sub-1 mA currents |
| Vishay 1N5259B | 68 V nominal, ±5% tolerance, ZZ = 100 Ω max at 10 mA, DO-35 package (smaller, lower PD = 500 mW) | Lower power rating limits use to signal-level clamping; not suitable for 1 W continuous dissipation scenarios | Select only for space-constrained, low-power signal conditioning - avoid in power supply regulation or surge absorption roles |
Compared with RD68F-T7-AZ, the 1N4749A offers superior regulation accuracy at higher bias currents but sacrifices low-leakage performance, while the 1N5259B reduces footprint at the cost of halved power capability and higher impedance - making RD68F-T7-AZ the optimal choice for industrial 1 W zener applications requiring DO-41 reliability and thermal robustness.
Availability
RD68F-T7-AZ is available at Aetrix Electronics and suitable for industrial power supplies, analog signal conditioning systems, and ruggedized communication interface protection requiring stable component supply and long-lifecycle support.
Supply support for RD68F-T7-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 leader delivering microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
RD68F-T7-AZ belongs to the RD2.0F–RD82F planar Zener diode family, engineered for standardized voltage reference and transient suppression in cost-sensitive, high-reliability industrial power systems.
FAQ
What is the exact zener voltage range specified for RD68F-T7-AZ?
The RD68F-T7-AZ is rated with a B-grade zener voltage range of 64 V to 72 V at 10 mA test current, per Renesas data sheet D13936EJ5V0DS. This 5.9% tolerance reflects composite binning across B1–B3 subgrades and is measured 40 ms after power application to ensure thermal stabilization.
Does RD68F-T7-AZ have a defined cathode marking, and how is polarity identified?
Yes, RD68F-T7-AZ uses a black cathode band on the glass body per JEDEC DO-41 standard. The banded end is the cathode; the unmarked end is the anode. This marking is visible under standard visual inspection and aligns with Renesas' package drawing in D13936EJ5V0DS.
Can RD68F-T7-AZ be used in surface-mount designs?
No - RD68F-T7-AZ is exclusively offered in the through-hole DO-41 axial package and has no SMD variant. Its DHD structure relies on lead-frame thermal conduction optimized for PCB-mounted leads; adapting it to SMT would require custom carrier or reflow-compatible sleeve, voiding thermal and reliability specifications.
What is the maximum allowable reverse leakage current for RD68F-T7-AZ at 52 V?
Per the Electrical Characteristics table in D13936EJ5V0DS, RD68F-T7-AZ guarantees reverse current (IR) ≤5 μA at VR = 52 V and TA = 25°C. This low leakage supports high-impedance bias networks and minimizes quiescent power loss in always-on industrial circuits.
How does the +52 mV/°C temperature coefficient affect circuit design with RD68F-T7-AZ?
The +52 mV/°C γZ means RD68F-T7-AZ's zener voltage increases ~3.5 V over a 67°C rise (e.g., from 25°C to 92°C). Designers must either compensate using negative-TC components (e.g., series silicon diodes) or restrict operating ambient to ≤60°C for <±2% total VZ drift in precision references.
RD68F-T7-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:
- -
RD68F-T7-AZ FAQ
1.How can I place an order for RD68F-T7-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD68F-T7-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 RD68F-T7-AZ reliable?
The price and inventory of RD68F-T7-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD68F-T7-AZ is usually 5 days.
3.What payment methods are accepted for RD68F-T7-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD68F-T7-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD68F-T7-AZ?
RD68F-T7-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD68F-T7-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 RD68F-T7-AZ?
For technical support, including RD68F-T7-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD68F-T7-AZ requirements.
6.How does Aetrix verify that RD68F-T7-AZ is sourced from the original manufacturer or authorized distributors?
All RD68F-T7-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 RD68F-T7-AZ meets industry standards.
7.What is the process for return or replacement of RD68F-T7-AZ?
All RD68F-T7-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD68F-T7-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 RD68F-T7-AZ part is unused and in its original packaging.
Return procedure for RD68F-T7-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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