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Renesas RD4.7F-T7-AZ
- Part No.:
- RD4.7F-T7-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD4.7F-T7-AZ.pdf
- Description:
- DIODE ZENER
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Inventory:227,500
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Product details
Overview
RD4.7F-T7-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode with nominal zener voltage 4.7 V (B grade, ±5% tolerance), dynamic impedance ≤10 Ω at 40 mA, and maximum reverse current of 20 μA at 2.0 V. It features a DO-41 glass-sealed DHD package, −1.5 mV/°C temperature coefficient, and is rated for surge reverse power up to 400 W (10 μs pulse). It is used in precision voltage reference and overvoltage protection circuits in industrial power supplies.
For engineers reviewing the RD4.7F-T7-AZ datasheet, RD4.7F-T7-AZ pinout, RD4.7F-T7-AZ application, or RD4.7F-T7-AZ equivalent, key selection criteria include its 4.7 V zener voltage tolerance, low dynamic impedance, DO-41 thermal performance, and suitability for constant-voltage regulation in DC-DC feedback loops and ESD clamp networks.
Technical Context
This device operates as a two-terminal voltage-reference element relying on controlled reverse-breakdown conduction. Its planar junction structure ensures stable zener voltage across temperature and lifetime, with a specified temperature coefficient of −1.5 mV/°C enabling predictable drift compensation in bias networks.
The DO-41 package provides defined thermal resistance (Rth ≈ 200°C/W on 5 mm² copper pad) and supports 1 W continuous dissipation at TA = 25°C, derating linearly above that ambient. Surge capability is validated at 400 W for 10 μs pulses per Figure 7.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.41–4.91 V at IZ = 40 mA; defines stable regulation point for feedback or clamping |
| Dynamic Impedance (ZZ) | ≤10 Ω at IZ = 40 mA; ensures minimal output voltage variation under load transients |
| Reverse Current (IR) | ≤20 μA at VR = 2.0 V; guarantees low leakage in standby or high-impedance sensing nodes |
| Temperature Coefficient (γZ) | −1.5 mV/°C typical; enables predictable voltage drift correction in temperature-critical references |
| Power Dissipation (P) | 1.0 W at TA = 25°C; sets maximum steady-state energy handling before thermal shutdown |
| Surge Reverse Power (PRSM) | 400 W at t = 10 μs; supports transient suppression of fast-rising ESD or inductive spikes |
| Junction Temperature (Tj) | 175°C maximum; constrains PCB layout and heatsinking for long-term reliability |
Pinout & Package
RD4.7F-T7-AZ uses a DO-41 axial-leaded glass package (JEDEC standard), with cathode indicated by a black band. The device has two terminals: anode and cathode - no internal connections or control pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lower potential; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal / regulated output node | Marked with black band; delivers stable 4.7 V reference when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| 1 W Planar Zener Structure | Enables stable voltage regulation with low noise and repeatable breakdown characteristics over 1000+ hours |
| E24-Series Voltage Standardization | Supports interoperability with common resistor-divider networks and legacy reference designs |
| DO-41 Glass Sealing | Provides hermetic moisture resistance and mechanical robustness for industrial-grade assembly and reflow |
| B-Grade Voltage Tolerance (±5%) | Meets cost-sensitive applications requiring moderate accuracy without tight-bin sorting |
| Negative Temperature Coefficient | −1.5 mV/°C allows predictable compensation when paired with positive-TC components (e.g., resistors) |
Applications
| Voltage Reference for SMPS Feedback | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated 12 V DC-DC converters to regulate output voltage within ±2%. IC Role / Device Role / Timing Role: Zener diode establishes precise 4.7 V reference for TL431 shunt regulator input threshold. Use Value: Low ZZ (≤10 Ω) minimizes loop gain variation across line/load, improving transient response stability. |
Use Scenario: Placed across analog sensor supply rail (5 V) to limit fault voltage during ESD events or wiring shorts. IC Role / Device Role / Timing Role: Clamps rail to ≤4.91 V during surges, protecting downstream op-amps and ADC inputs. Use Value: 400 W/10 μs surge rating absorbs IEC 61000-4-2 contact discharge without degradation. |
| Constant-Current Bias Generator | Waveform Limiter in Signal Conditioning |
Use Scenario: Configured with series resistor to deliver stable 10 mA bias current to phototransistor amplifiers in optical isolators. IC Role / Device Role / Timing Role: Maintains fixed VZ drop to set emitter-base voltage of PNP current source transistor. Use Value: −1.5 mV/°C TC enables <1% current drift over −40°C to +85°C ambient range. |
Use Scenario: Connected in anti-parallel with signal path to clip ±5 V audio or control signals to safe levels for microcontroller inputs. IC Role / Device Role / Timing Role: Limits peak excursions to ±4.91 V while presenting <10 Ω dynamic impedance during clipping. Use Value: Fast recovery (<50 ns) and low capacitance (<5 pF) preserve signal integrity up to 1 MHz. |
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 achieved via tighter binning; ZZ = 9 Ω max at 49 mA; DO-41 package | Slightly higher test current (49 mA vs. 40 mA); identical thermal profile and surge rating | Preferred where legacy 1N47xx footprint compatibility is required; same PCB layout |
| BZX55-C4V7 (Vishay) | 4.7 V nominal, ±5% tolerance; ZZ = 14 Ω max at 5 mA; DO-35 package (smaller, lower power: 500 mW) | Lower power rating limits use to sub-500 mW applications; not suitable for 1 W continuous operation | Select only for space-constrained, low-power signal-level clamping; requires layout change |
Compared with RD4.7F-T7-AZ, the 1N4732A offers identical electrical function and mechanical fit with minor test-current variance, while the BZX55-C4V7 trades power capability for size-making RD4.7F-T7-AZ the optimal choice for industrial 1 W regulation and surge absorption where thermal margin is critical.
Availability
RD4.7F-T7-AZ is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface protection, and analog signal conditioning requiring stable component supply and long-lifecycle support.
Supply support for RD4.7F-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 manufacturer formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.
RD4.7F-T7-AZ belongs to the RD2.0F–RD82F planar zener diode family, designed for standardized voltage reference and transient protection in industrial, computing, and communications equipment.
FAQ
What is the zener voltage tolerance for RD4.7F-T7-AZ?
The RD4.7F-T7-AZ has a B-grade zener voltage specification of 4.41 V minimum to 4.91 V maximum at 40 mA test current, corresponding to ±5% tolerance around the nominal 4.7 V value. This tolerance is verified per the D13936EJ5V0DS datasheet, and applies under standard 40 ms test conditions after power-on.
Does RD4.7F-T7-AZ support surge protection applications?
Yes, RD4.7F-T7-AZ is rated for 400 W surge reverse power at 10 μs pulse width (Figure 7, D13936EJ5V0DS), making it suitable for transient voltage suppression in industrial interfaces and power rails. Its DO-41 package and planar junction ensure reliable energy absorption without parametric shift after repeated surges.
What is the thermal resistance of RD4.7F-T7-AZ in standard mounting?
RD4.7F-T7-AZ exhibits approximately 200°C/W junction-to-ambient thermal resistance when mounted on a 5 mm² copper pad (Figure 2, D13936EJ5V0DS). Derating follows a linear curve: full 1 W is allowed only at TA ≤ 25°C; above that, power must be reduced by 8.3 mW/°C.
Can RD4.7F-T7-AZ be used in place of a 1N4732A?
RD4.7F-T7-AZ is functionally and mechanically compatible with the 1N4732A: both are DO-41 packaged 4.7 V ±5% zeners rated for 1 W. Differences include test current (40 mA vs. 49 mA) and dynamic impedance (≤10 Ω vs. ≤9 Ω), but these do not preclude direct substitution in most voltage-reference or clamp roles.
What is the maximum reverse current for RD4.7F-T7-AZ at 2.0 V?
Per the Electrical Characteristics table in D13936EJ5V0DS, RD4.7F-T7-AZ guarantees reverse current ≤20 μA at VR = 2.0 V and TA = 25°C. This low leakage supports high-impedance bias networks and battery-powered circuits where standby current must remain below 100 μA.
RD4.7F-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:
- -
RD4.7F-T7-AZ FAQ
1.How can I place an order for RD4.7F-T7-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD4.7F-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 RD4.7F-T7-AZ reliable?
The price and inventory of RD4.7F-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 RD4.7F-T7-AZ is usually 5 days.
3.What payment methods are accepted for RD4.7F-T7-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD4.7F-T7-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD4.7F-T7-AZ?
RD4.7F-T7-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD4.7F-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 RD4.7F-T7-AZ?
For technical support, including RD4.7F-T7-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD4.7F-T7-AZ requirements.
6.How does Aetrix verify that RD4.7F-T7-AZ is sourced from the original manufacturer or authorized distributors?
All RD4.7F-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 RD4.7F-T7-AZ meets industry standards.
7.What is the process for return or replacement of RD4.7F-T7-AZ?
All RD4.7F-T7-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD4.7F-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 RD4.7F-T7-AZ part is unused and in its original packaging.
Return procedure for RD4.7F-T7-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD4.7F-T7-AZ Tags
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