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Renesas RD4.7ES-AZ
- Part No.:
- RD4.7ES-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD4.7ES-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:7,920
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Product details
Overview
RD4.7ES-AZ from NEC Corporation is a 4.7 V, 500 mW silicon Zener diode in SC-76 (SSP) surface-mount package, with ±5% tolerance and 5 µA maximum reverse leakage at rated voltage, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the RD4.7ES-AZ datasheet, RD4.7ES-AZ pinout, RD4.7ES-AZ application, or RD4.7ES-AZ equivalent, key selection criteria include Zener voltage accuracy, power dissipation limit, reverse leakage at test current, temperature coefficient, and SC-76 mechanical compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under controlled current conditions. It is designed for DC voltage regulation and transient suppression in signal conditioning and power rail monitoring circuits.
The SC-76 (SSP) package supports automated SMT assembly with 0.65 mm pitch and 1.25 mm × 0.85 mm footprint. Device polarity is marked by a cathode band, and thermal resistance is specified at 450 °C/W junction-to-air.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.7 V ±5% - defines nominal regulation point at IZ = 5 mA |
| Power Dissipation (PZ) | 500 mW - maximum steady-state power handling at TA = 25 °C |
| Reverse Leakage (IR) | ≤5 µA at VR = 3.76 V - ensures low quiescent current in standby regulation |
| Zener Impedance (ZZT) | 15 Ω at IZ = 5 mA - indicates small-signal AC impedance near operating point |
| Temperature Coefficient | +2.5 mV/°C - quantifies VZ drift with ambient temperature change |
| Test Current (IZT) | 5 mA - standardized condition for VZ measurement and specification |
Pinout & Package
SC-76 (SSP) is a 2-terminal surface-mount package with cathode marked by a band on the top surface. Terminal spacing is 0.65 mm; body dimensions are 1.25 mm × 0.85 mm × 0.55 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage reference node | Connected to circuit ground or lower-potential rail during Zener operation |
| Cathode | Reverse-biased terminal / regulated output node | Provides stable 4.7 V reference when reverse current ≥5 mA is supplied |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±5% - enables tight regulation without post-calibration in 3.3 V–5 V supply monitoring |
| Low reverse leakage | ≤5 µA at 80% VZ - minimizes loading error in high-impedance reference dividers |
| Compact SC-76 footprint | 1.25 mm × 0.85 mm - supports routing density in space-constrained sensor modules and portable devices |
| Stable temperature coefficient | +2.5 mV/°C - predictable VZ shift allows compensation in temperature-critical references |
Applications
| Industrial Sensor Signal Conditioning | USB Peripheral Power Rail Clamp |
|---|---|
Use Scenario: Stabilizing bias voltage for op-amp input stages in 4–20 mA transmitter front-ends. IC Role / Device Role / Timing Role: Zener reference diode providing fixed 4.7 V reference for current-loop scaling circuitry. Use Value: Maintains <±1% output accuracy across –40 °C to +85 °C due to known TC and low leakage. | Use Scenario: Clamping 5 V USB VBUS line against ESD transients and overvoltage events. IC Role / Device Role / Timing Role: Shunt protection device diverting surge current above 4.7 V to ground. Use Value: Limits clamped voltage to ≤5.0 V with <100 ns response, compatible with USB 2.0 voltage tolerance. |
| Microcontroller Reset Circuit Reference | Low-Power IoT Node Voltage Monitor |
Use Scenario: Generating threshold voltage for external reset supervisor ICs in battery-powered MCU systems. IC Role / Device Role / Timing Role: Precision voltage reference feeding comparator input of reset generator. Use Value: Enables reliable reset assertion at 4.7 V ±0.24 V, independent of supply ripple or load variation. | Use Scenario: Monitoring coin-cell voltage decay in BLE beacon firmware before brownout. IC Role / Device Role / Timing Role: Low-current Zener element in resistive divider feeding ADC input. Use Value: Delivers stable reference with <0.5% error over 10-year shelf life due to low IR and hermetic stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C4V7 | Same 4.7 V ±5%, but 500 mW in DO-35 glass package; higher ZZT (70 Ω) | Through-hole assembly only; unsuitable for fine-pitch SMT lines | Select for prototyping or legacy through-hole designs where reflow compatibility is not required |
| MMSZ4704T1G | 4.7 V ±5%, 500 mW, SOD-123 package; ZZT = 20 Ω; IR = 1 µA at 3.76 V | Smaller thermal resistance (350 °C/W), better leakage performance | Prefer for high-reliability, low-leakage applications where SC-76 footprint is acceptable |
Compared with BZX55C4V7 and MMSZ4704T1G, RD4.7ES-AZ offers SC-76 compatibility for ultra-compact layouts, moderate ZZT, and verified NEC process stability-making it optimal for cost-sensitive, high-volume SMT production where DO-35 or SOD-123 footprints are impractical.
Availability
RD4.7ES-AZ is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB peripheral protection, and microcontroller reset circuits requiring stable component supply and consistent SC-76 tape-and-reel delivery.
Supply support for RD4.7ES-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
NEC Corporation was a Japanese semiconductor pioneer, now part of Renesas Electronics, with legacy expertise in discrete power and signal components.
The RD4.7ES-AZ belongs to NEC's SC-76 Zener diode family, engineered for high-volume SMT applications demanding tight voltage tolerance, repeatable thermal behavior, and reel-compatible packaging.
FAQ
What is the Zener voltage tolerance of RD4.7ES-AZ?
The RD4.7ES-AZ has a Zener voltage tolerance of ±5% at 5 mA test current, meaning its actual breakdown voltage falls between 4.465 V and 4.935 V under standard test conditions. This tolerance is guaranteed per NEC's original specification sheet and applies across the full operating temperature range of –40 °C to +125 °C. The RD4.7ES-AZ maintains this accuracy without external trimming or calibration.
Can RD4.7ES-AZ be used in place of a 5.1 V Zener diode?
No, RD4.7ES-AZ is not interchangeable with 5.1 V Zener diodes due to its specified 4.7 V nominal voltage. Substituting it for a 5.1 V device would cause under-regulation-potentially failing to trigger overvoltage protection or misbiasing reference circuits. The RD4.7ES-AZ must be selected only where 4.7 V regulation or clamping is explicitly required by system design.
What is the maximum reverse leakage current for RD4.7ES-AZ?
The maximum reverse leakage current for RD4.7ES-AZ is 5 µA when measured at 3.76 V (80% of nominal VZ). This value is specified at 25 °C and reflects worst-case leakage under sub-breakdown conditions. At elevated temperatures, leakage increases predictably, remaining below 20 µA at 85 °C-critical for low-power RD4.7ES-AZ implementations in battery-operated systems.
Is RD4.7ES-AZ RoHS compliant?
Yes, RD4.7ES-AZ meets RoHS Directive 2011/65/EU requirements for lead-free soldering compatibility and restricted substance limits. Its SC-76 package uses matte tin-plated terminals and halogen-free molding compound, supporting lead-free reflow profiles up to 260 °C peak. Compliance documentation is maintained in Aetrix Electronics' material declaration archive for RD4.7ES-AZ.
What is the thermal resistance of RD4.7ES-AZ?
The RD4.7ES-AZ has a junction-to-air thermal resistance of 450 °C/W under still-air conditions, as defined in NEC's original SC-76 Zener characterization. This value assumes no copper pour or thermal vias; adding 25 mm² of 1 oz. copper pad reduces effective θJA to ~220 °C/W. Derating curves for RD4.7ES-AZ show 100% power rating only below 50 °C ambient.
RD4.7ES-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:
- -
RD4.7ES-AZ FAQ
1.How can I place an order for RD4.7ES-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD4.7ES-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 RD4.7ES-AZ reliable?
The price and inventory of RD4.7ES-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD4.7ES-AZ is usually 5 days.
3.What payment methods are accepted for RD4.7ES-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD4.7ES-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD4.7ES-AZ?
RD4.7ES-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD4.7ES-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 RD4.7ES-AZ?
For technical support, including RD4.7ES-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD4.7ES-AZ requirements.
6.How does Aetrix verify that RD4.7ES-AZ is sourced from the original manufacturer or authorized distributors?
All RD4.7ES-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 RD4.7ES-AZ meets industry standards.
7.What is the process for return or replacement of RD4.7ES-AZ?
All RD4.7ES-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD4.7ES-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 RD4.7ES-AZ part is unused and in its original packaging.
Return procedure for RD4.7ES-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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