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Renesas RD4.7JS
- Part No.:
- RD4.7JS
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD4.7JS.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
RD4.7JS from Renesas Electronics is a 4.7 V, 400 mW DO-34 glass-sealed Zener diode with sharp breakdown characteristics and low noise performance, designed for precision voltage regulation in analog signal conditioning, reference circuits, and waveform clipping applications.
For engineers reviewing the RD4.7JS datasheet, RD4.7JS pinout, RD4.7JS application, or RD4.7JS equivalent, key selection considerations include its 4.42–4.90 V zener voltage range (AB1–AB3 variants), 5 mA test current, 800 µA max reverse leakage at 0.5 V, and 175 °C junction temperature rating.
Technical Context
The RD4.7JS operates as a silicon planar Zener diode using DHD (Double Heatsink Diode) construction in a miniature DO-34 package. Its sharp breakdown and low dynamic impedance (Zz ≤ 100 Ω at 5 mA) support stable regulation under varying load conditions.
It exhibits a negative temperature coefficient (−γz ≈ −0.02 %/°C at 4.7 V) and low noise spectral density (en ≤ 50 µV/√Hz at 10–500 kHz), making it suitable for low-drift reference designs where thermal stability and signal integrity are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 4.42–4.90 V (AB1–AB3 variants at Iz = 5 mA); defines precise clamping threshold for voltage reference or protection |
| Power Dissipation (P) | 400 mW at TA = 25 °C; sets maximum continuous DC power handling before thermal derating |
| Dynamic Impedance (Zz) | ≤100 Ω at Iz = 5 mA; ensures minimal output voltage variation under load current changes |
| Reverse Leakage (IR) | ≤800 µA at VR = 0.5 V; guarantees low standby current in high-impedance bias networks |
| Junction Temperature (Tj) | 175 °C maximum; enables operation in elevated ambient environments with appropriate PCB thermal relief |
| Noise Level (en) | ≤50 µV/√Hz (10–500 kHz); supports use in low-noise analog references without added filtering |
| Surge Power (PRSM) | 2.4 W (10 µs pulse); provides transient overvoltage resilience in clamp or protection circuits |
Pinout & Package
RD4.7JS uses a DO-34 glass-sealed axial package (JEDEC standard) with cathode indicated by a blue band near one lead end. The device has two terminals: anode and cathode - no internal connections or multi-pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener operation; carries forward current up to 150 mA |
| Cathode | Zener breakdown terminal | Marked with blue band; connected to higher-potential node during regulation; defines Vz reference polarity |
Key Features
| Feature | Design Value |
|---|---|
| Low noise performance | en ≤ 50 µV/√Hz (10–500 kHz) enables direct use in precision analog references without external filtering |
| Sharp breakdown characteristic | Dynamic impedance Zz ≤ 100 Ω at 5 mA ensures tight regulation tolerance across operating current range |
| DO-34 glass package | Hermetically sealed construction provides long-term stability and moisture resistance in industrial environments |
| E24-standard Vz grading | Vz tolerance aligned to E24 series (±5%) supports interoperability with standard resistor networks and feedback dividers |
| DHD thermal structure | Double heatsink design improves thermal resistance (Rth ≈ 375 °C/W on 3 mm² copper) for reliable 400 mW operation |
Applications
| Reference Voltage Source | Waveform Clipping Circuit |
|---|---|
|
Use Scenario: Generating a stable 4.7 V reference for ADC biasing or op-amp level-shifting in sensor front-ends. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to provide fixed voltage node. Use Value: Low 50 µV/√Hz noise and <100 Ω dynamic impedance maintain signal fidelity and reduce calibration drift. |
Use Scenario: Limiting AC signal peaks to ±4.7 V in audio preamplifier input stages. IC Role / Device Role / Timing Role: Bidirectional clamping element (with series resistor) defining hard voltage rails. Use Value: Sharp breakdown onset minimizes distortion at clipping threshold; 2.4 W surge rating absorbs transient overloads. |
| Constant Current Sink | Overvoltage Protection Node |
|
Use Scenario: Setting bias current for LED drivers or transistor amplifiers via Zener-based current mirror. IC Role / Device Role / Timing Role: Voltage reference establishing emitter-base or gate-source potential difference. Use Value: Tight 4.42–4.90 V Vz spread (AB1–AB3) allows predictable current setting within ±5% tolerance. |
Use Scenario: Protecting microcontroller I/O pins from ESD or supply rail transients exceeding 4.7 V. IC Role / Device Role / Timing Role: Shunt regulator diverting excess energy to ground when voltage exceeds Vz. Use Value: 175 °C junction rating and 2.4 W 10 µs surge capability enable robust protection without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4732A | 4.7 V nominal, 1 W rating, DO-41 package, Zz ≈ 14 Ω at 49 mA | Higher power and lower Zz but larger footprint and different thermal profile | Preferred for higher-current regulation; not drop-in due to DO-41 vs. DO-34 mechanical mismatch |
| BZX55-C4V7 | 4.7 V nominal, 500 mW rating, DO-35 package, Zz ≈ 70 Ω at 5 mA | Similar power and Zz, but DO-35 glass package has slightly longer body and different marking | Valid functional alternative with comparable noise and regulation; requires layout verification for lead spacing |
Compared with RD4.7JS, the 1N4732A offers higher power and lower impedance but demands PCB redesign for DO-41 mounting, while BZX55-C4V7 matches closely in electrical behavior and thermal class but differs in mechanical dimensions and marking convention.
Availability
RD4.7JS is available at Aetrix Electronics and suitable for constant voltage reference, waveform clipping, and overvoltage protection applications requiring stable component supply, long-term parametric consistency, and industrial-grade reliability.
Supply support for RD4.7JS 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 for industrial and consumer systems.
The RD4.7JS belongs to Renesas' legacy Zener diode family designed for precision voltage regulation in Standard-grade applications including office equipment, test instrumentation, and audio electronics.
FAQ
What is the exact zener voltage range for RD4.7JS?
The RD4.7JS has three factory-specified variants: AB1 (4.42–4.61 V), AB2 (4.55–4.75 V), and AB3 (4.69–4.90 V), all tested at 5 mA. These ranges reflect E24-standard grading and ensure predictable regulation within ±5% of nominal 4.7 V across production lots.
Does RD4.7JS support bidirectional clamping?
No - RD4.7JS is a unidirectional Zener diode optimized for reverse-bias operation. It conducts only when cathode voltage exceeds anode by ≥Vz. For bidirectional clamping, two RD4.7JS diodes must be connected in series opposition with appropriate current limiting.
What is the maximum allowable reverse current before breakdown for RD4.7JS?
At VR = 0.5 V, RD4.7JS guarantees IR ≤ 800 µA; at VR = 1.0 V, IR ≤ 2 µA. These values define the leakage ceiling in pre-breakdown bias networks and confirm suitability for high-impedance reference divider applications.
How does RD4.7JS perform under thermal stress?
RD4.7JS maintains rated 400 mW dissipation up to 25 °C ambient, derating linearly to zero at 175 °C junction temperature. Its DO-34 package achieves ~375 °C/W thermal resistance on 3 mm² copper, enabling safe operation with modest PCB copper area.
Is RD4.7JS RoHS compliant?
Yes - RD4.7JS meets EU RoHS Directive requirements. Renesas confirms compliance for this part in its environmental documentation, with lead-free terminations and halogen-free packaging consistent with industry-standard DO-34 manufacturing.
RD4.7JS 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:
- -
RD4.7JS FAQ
1.How can I place an order for RD4.7JS through Aetrix?
Please submit a Request for Quotation (RFQ) for RD4.7JS 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 RD4.7JS reliable?
The price and inventory of RD4.7JS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD4.7JS is usually 5 days.
3.What payment methods are accepted for RD4.7JS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD4.7JS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD4.7JS?
RD4.7JS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD4.7JS 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 RD4.7JS?
For technical support, including RD4.7JS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD4.7JS requirements.
6.How does Aetrix verify that RD4.7JS is sourced from the original manufacturer or authorized distributors?
All RD4.7JS 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 RD4.7JS meets industry standards.
7.What is the process for return or replacement of RD4.7JS?
All RD4.7JS units undergo pre-shipment inspection (PSI). If there is an issue with RD4.7JS, 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 RD4.7JS part is unused and in its original packaging.
Return procedure for RD4.7JS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD4.7JS Tags
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