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Renesas RD4.7F-AZ
- Part No.:
- RD4.7F-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD4.7F-AZ.pdf
- Description:
- DIODE ZENER
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Inventory:9,040
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Product details
Overview
RD4.7F-AZ from Renesas Electronics is a 1 W planar silicon zener diode in DO-41 glass package, with nominal zener voltage 4.7 V (B3 grade: 4.66–4.91 V), dynamic impedance ≤10 Ω at 40 mA, and reverse current ≤20 μA at 2.0 V. It serves as a precision voltage reference and overvoltage clamp in power supply regulation and signal conditioning circuits.
For engineers reviewing the RD4.7F-AZ datasheet, RD4.7F-AZ pinout, RD4.7F-AZ application, or RD4.7F-AZ equivalent, this component is selected for stable low-voltage regulation where thermal coefficient (−1.5 mV/°C), surge tolerance (400 W @ 10 μs), and JEDEC-standard DO-41 mechanical compatibility are critical design factors.
Technical Context
This device operates as a two-terminal voltage-reference diode relying on controlled avalanche breakdown in its planar-junction structure. Its zener voltage is specified under 40 ms pulse test conditions, and its temperature coefficient is negative and tightly bounded at −1.5 mV/°C (typical) across the operating range.
The RD4.7F-AZ exhibits low dynamic impedance (≤10 Ω at IZ = 40 mA) and supports surge reverse power up to 400 W for 10 μs pulses. Its junction temperature rating of 175°C and DO-41 package enable reliable operation in ambient temperatures up to 125°C with appropriate PCB copper heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.66–4.91 V at IZ = 40 mA - defines precise clamping threshold for 5 V rail protection |
| Power Dissipation (P) | 1.0 W at TA = 25°C - sets continuous DC power limit; derates linearly above 25°C per Figure 1 |
| Dynamic Impedance (ZZ) | ≤10 Ω at IZ = 40 mA - ensures minimal voltage shift under load transients |
| Reverse Current (IR) | ≤20 μA at VR = 2.0 V - guarantees low leakage in standby or high-impedance bias networks |
| Temperature Coefficient (γZ) | −1.5 mV/°C (typical) - enables predictable drift compensation in temperature-sensitive references |
| Surge Reverse Power (PRSM) | 400 W at t = 10 μs - provides robust transient suppression against ESD or inductive kickback |
| Junction Temperature (Tj) | 175°C maximum - allows operation in high-temperature industrial environments with proper thermal design |
Pinout & Package
RD4.7F-AZ uses the standard 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 circuitry or additional pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased zener configuration; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node; sustains regulated voltage drop during reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| Planar-type DHD structure | Enables consistent 1 W power handling and improved thermal stability vs. alloy-junction diodes |
| E24-series voltage grading | Ensures interoperability with standard resistor/capacitor value systems for analog design reuse |
| B3-grade voltage tolerance | Provides tighter 4.66–4.91 V window (±2.7%) versus broader B-grade options, reducing calibration overhead |
| Negative temperature coefficient | −1.5 mV/°C enables predictable drift behavior for compensated reference designs |
| DO-41 mechanical standardization | Guarantees compatibility with automated axial insertion equipment and legacy PCB footprints |
Applications
| 5 V Power Rail Regulation | Signal-Level Voltage Clamping |
|---|---|
Use Scenario: Stabilizing unregulated 5 V DC output from linear regulators or switching converters in embedded controllers. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp output voltage and absorb transient overvoltage. Use Value: Maintains ±3% regulation under load steps up to 100 mA using only passive components and no feedback loop. |
Use Scenario: Protecting ADC inputs or microcontroller GPIO pins from ESD or overvoltage events in sensor interface circuits. IC Role / Device Role / Timing Role: Bidirectional clamping element limiting signal swing to safe levels relative to VDD and GND. Use Value: Limits input to ≤5.2 V and ≥−0.7 V while drawing <1 μA leakage at nominal 3.3 V operation. |
| Waveform Limiting in Analog Circuits | Surge Absorption in Industrial I/O |
Use Scenario: Shaping sine-wave oscillator outputs into square waves via symmetrical clipping in function generator designs. IC Role / Device Role / Timing Role: Dual-zener back-to-back configuration acting as precision amplitude limiter. Use Value: Achieves 4.7 V peak-to-peak clipping accuracy with <50 mV hysteresis due to matched dynamic impedance. |
Use Scenario: Suppressing inductive kickback from solenoid drivers or relay coils in PLC digital output modules. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing 400 W surges for 10 μs without degradation. Use Value: Prevents MOSFET gate oxide failure by clamping flyback spikes to <5.5 V within 100 ns response time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4732A (ON Semiconductor) | Same 4.7 V nominal, but ±5% tolerance (4.47–4.94 V); ZZ ≤ 9 Ω; DO-41 package | Higher voltage spread reduces precision in tight-tolerance references; identical surge rating | Acceptable where cost sensitivity outweighs ±2.7% B3-grade accuracy requirement |
| BZX55-C4V7 (Vishay) | 4.7 V nominal, ±5% tolerance; ZZ ≤ 14 Ω; same DO-41 footprint but rated for 500 mW only | Limited to 0.5 W continuous dissipation; unsuitable for sustained 1 W thermal loads | Only suitable for low-duty-cycle clamping or space-constrained designs where 1 W rating is not required |
Compared with 1N4732A and BZX55-C4V7, RD4.7F-AZ delivers tighter voltage tolerance, full 1 W continuous rating, and verified −1.5 mV/°C temperature coefficient - making it preferred for industrial power monitoring and precision analog reference designs where long-term stability matters.
Availability
RD4.7F-AZ is available at Aetrix Electronics and suitable for 5 V power rail regulation, signal-level voltage clamping, and surge absorption in industrial control systems requiring stable component supply and traceable sourcing.
Supply support for RD4.7F-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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.
The RD4.7F-AZ belongs to Renesas' legacy planar zener diode family designed for general-purpose voltage regulation and transient protection in standard industrial and consumer electronics applications.
FAQ
What is the exact zener voltage tolerance for RD4.7F-AZ?
The RD4.7F-AZ is specified in the B3 voltage classification, with a guaranteed zener voltage range of 4.66 V to 4.91 V at 40 mA test current. This ±2.7% tolerance is tighter than the broader B-grade (4.41–4.91 V) and supports higher-accuracy regulation without post-production trimming. The RD4.7F-AZ datasheet confirms this range under 40 ms pulse testing per Note 1.
Does RD4.7F-AZ have a positive or negative temperature coefficient?
The RD4.7F-AZ has a negative temperature coefficient of −1.5 mV/°C (typical), meaning its zener voltage decreases slightly as junction temperature increases. This behavior is confirmed in the Electrical Characteristics table and Figure 4 of the RD2.0F–RD82F datasheet. The RD4.7F-AZ's coefficient is more stable than lower-voltage zeners in the same family, supporting predictable drift compensation.
What is the maximum surge power RD4.7F-AZ can withstand?
The RD4.7F-AZ supports a surge reverse power of 400 W for pulse widths up to 10 μs, as defined in the Absolute Maximum Ratings table. This rating is validated per Figure 7 in the datasheet and applies under non-repetitive conditions at TA = 25°C. The RD4.7F-AZ's DO-41 package and planar DHD structure enable this high transient capability without parametric shift.
Is RD4.7F-AZ compatible with automated through-hole assembly?
Yes - RD4.7F-AZ uses the JEDEC-standard DO-41 axial package (3.0 mm Ø × 5.0 mm L) with 0.51 mm lead diameter, fully compatible with industry-standard axial insertion equipment and wave soldering profiles. The RD4.7F-AZ's glass body and black cathode band meet IPC-A-610 visual inspection criteria for polarity identification and solder joint acceptance.
What quality grade is assigned to RD4.7F-AZ?
The RD4.7F-AZ is classified as "Standard" grade per Renesas' quality categorization, intended for applications including computers, office equipment, communications gear, audio/video systems, and industrial robots. This is the default grade unless otherwise specified - and no "High Quality" or "Specific" designation appears in the RD2.0F–RD82F datasheet or ordering documentation for RD4.7F-AZ.
RD4.7F-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:
- -
RD4.7F-AZ FAQ
1.How can I place an order for RD4.7F-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD4.7F-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 RD4.7F-AZ reliable?
The price and inventory of RD4.7F-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD4.7F-AZ is usually 5 days.
3.What payment methods are accepted for RD4.7F-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD4.7F-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD4.7F-AZ?
RD4.7F-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD4.7F-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 RD4.7F-AZ?
For technical support, including RD4.7F-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD4.7F-AZ requirements.
6.How does Aetrix verify that RD4.7F-AZ is sourced from the original manufacturer or authorized distributors?
All RD4.7F-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 RD4.7F-AZ meets industry standards.
7.What is the process for return or replacement of RD4.7F-AZ?
All RD4.7F-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD4.7F-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 RD4.7F-AZ part is unused and in its original packaging.
Return procedure for RD4.7F-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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