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Renesas RD4.7JS-T4-AZ
- Part No.:
- RD4.7JS-T4-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD4.7JS-T4-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:25,000
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Product details
Overview
RD4.7JS-T4-AZ from Renesas Electronics is a 4.7 V, ±5% tolerance, 400 mW glass-encapsulated Zener diode in DO-34 package, designed for precision voltage regulation and waveform clipping in low-noise analog circuits. It delivers sharp breakdown characteristics, low dynamic impedance (Zz = 10 Ω at Iz = 5 mA), and operates with reverse current ≤100 µA at VR = 0.5 V.
For engineers reviewing the RD4.7JS-T4-AZ datasheet, RD4.7JS-T4-AZ pinout, RD4.7JS-T4-AZ application, or RD4.7JS-T4-AZ equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (Rth-JA = 375 °C/W on 3 mm² copper), noise performance (en = 40 µV at 10–500 kHz), and surge capability (PRSM = 2.4 W, t = 10 µs).
Technical Context
This device implements a silicon planar Zener structure with Double Heatsink Diode (DHD) construction to enhance thermal stability and reduce noise. Its sharp knee characteristic enables reliable clamping and reference behavior at low test currents (Iz = 5 mA), while the DO-34 glass package ensures hermetic sealing and stable long-term Vz drift.
The RD4.7JS-T4-AZ exhibits a negative temperature coefficient (γz = –0.02 %/°C) near 4.7 V, minimizing thermal drift in bias networks. Its low noise output and tight Vz distribution (AB1 suffix: 4.42–4.61 V) make it suitable for analog references where signal integrity is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 4.7 V nominal, AB1 variant 4.42–4.61 V at Iz = 5 mA - defines stable regulation point for low-power references |
| Power Dissipation (P) | 400 mW at TA = 25 °C - sets maximum continuous DC power handling before thermal derating |
| Dynamic Impedance (Zz) | 10 Ω at Iz = 5 mA - ensures minimal output voltage variation under load transients |
| Reverse Current (IR) | ≤100 µA at VR = 0.5 V - guarantees low leakage in high-impedance bias networks |
| Surge Power (PRSM) | 2.4 W for 10 µs non-repetitive pulse - supports transient overvoltage protection in clamp circuits |
| Junction Temperature (Tj) | 175 °C max - allows operation in elevated ambient environments with appropriate PCB copper area |
| Package | DO-34 (JEDEC) glass-sealed, 2.4 mm max body length - enables manual soldering and legacy through-hole compatibility |
Pinout & Package
DO-34 glass axial package with cathode indicated by blue band; two-terminal device with no internal complexity - anode and cathode terminals only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common when used as shunt regulator; defines polarity for reverse-bias operation |
| Cathode | Zener breakdown terminal / Voltage reference output | Marked with blue band; supplies regulated voltage relative to anode; must be held at higher potential than anode |
Key Features
| Feature | Design Value |
|---|---|
| Low noise performance | en = 40 µV (10–500 kHz) - preserves SNR in audio preamps and sensor signal chains |
| Sharp breakdown knee | Zzk = 100 Ω at Iz = 1 mA - enables precise threshold detection in clipping and protection circuits |
| E24-standard Vz grading | Vz aligned to E24 series (4.7 V ±5%) - simplifies BOM consolidation and cross-vendor sourcing |
| Hermetic glass seal | DO-34 JEDEC package with moisture-resistant encapsulation - ensures reliability in humid or industrial environments |
| Thermal resistance control | Rth-JA = 375 °C/W on 3 mm² copper - enables predictable derating curves for board-level thermal design |
Applications
| Audio Signal Clipping | Low-Power Voltage Reference |
|---|---|
Use Scenario: Symmetrical waveform limiting in guitar effect pedals and line-level audio buffers. IC Role / Device Role / Timing Role: Shunt-connected Zener acting as bidirectional voltage clamp to prevent op-amp saturation. Use Value: Low noise (40 µV) and sharp knee (Zzk = 100 Ω) preserve harmonic integrity while limiting peaks at ±4.7 V. |
Use Scenario: Stable bias generation for JFET amplifiers and analog front-ends in portable instrumentation. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference replacing active IC references where ultra-low quiescent current is required. Use Value: 100 µA max IR at 0.5 V ensures minimal loading on high-Z divider networks; 400 mW rating supports 1–2 mA operating current. |
| Overvoltage Protection | Waveform Shaping in Sensor Interfaces |
Use Scenario: Input protection for ADC drivers exposed to ESD or supply rail transients. IC Role / Device Role / Timing Role: Clamp diode placed between signal line and ground to limit excursion beyond ±4.7 V. Use Value: 2.4 W surge rating (10 µs) absorbs IEC 61000-4-2 contact discharge energy without degradation. |
Use Scenario: Linearizing transfer function of thermistor-based temperature sensors using piecewise Zener clamping. IC Role / Device Role / Timing Role: Precision shunt element defining fixed breakpoints in analog conditioning stages. Use Value: Tight Vz tolerance (AB1: 4.42–4.61 V) and low Zz (10 Ω) ensure repeatable clipping thresholds across production units. |
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 only in "A" grade; Zz = 14 Ω at 49 mA (higher test current); DO-41 package (larger, 4.2 mm body) | Higher power (1 W) but less suitable for space-constrained or low-noise designs due to larger package and higher Zz at low Iz | Prefer RD4.7JS-T4-AZ when board space, low-noise, or low-Iz regulation (<5 mA) is critical |
| BZX55-C4V7 (Vishay) | Same 4.7 V, ±5%; Zz = 70 Ω at Iz = 5 mA (7× higher than RD4.7JS-T4-AZ); DO-35 package (glass, 3.6 mm body) | Higher dynamic impedance degrades regulation accuracy under varying load; less effective in precision clipping | Prefer RD4.7JS-T4-AZ where sharp knee and low Zz are required for analog signal fidelity |
Compared with 1N4732A and BZX55-C4V7, RD4.7JS-T4-AZ offers superior low-current regulation (Zz = 10 Ω @ 5 mA), lower noise (40 µV), and smaller DO-34 footprint-making it optimal for compact, high-fidelity analog circuits rather than general-purpose power regulation.
Availability
RD4.7JS-T4-AZ is available at Aetrix Electronics and suitable for audio signal conditioning, low-power voltage referencing, and overvoltage protection circuits requiring stable component supply and long-lifecycle support.
Supply support for RD4.7JS-T4-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 specializing in microcontrollers, analog, power, and timing solutions, with roots in NEC and Hitachi semiconductor divisions.
The RD4.7JS-T4-AZ belongs to Renesas' legacy Zener diode family engineered for precision analog applications-designed to deliver low-noise, sharp-breakdown performance in industrial, audio, and measurement equipment.
FAQ
What is the exact Zener voltage range for RD4.7JS-T4-AZ at 5 mA test current?
The RD4.7JS-T4-AZ is specified with AB1 suffix per the datasheet, yielding a Zener voltage range of 4.42 V to 4.61 V at Iz = 5 mA and TA = 25 °C. This 4.7 V nominal device adheres to E24 standard tolerance (±5%), and its tight distribution supports consistent performance in production analog circuits. RD4.7JS-T4-AZ does not use AB2 or AB3 variants in this marking.
Is RD4.7JS-T4-AZ RoHS compliant?
Yes, RD4.7JS-T4-AZ meets EU RoHS Directive requirements. As a Renesas Electronics product manufactured after the 2010 merger and documented in D13937EJ5V0DS00 (5th edition), it contains no restricted substances above threshold limits. Compliance is verified through Renesas' material declarations and applies to both leaded and lead-free assembly processes.
What is the maximum allowable reverse surge power for RD4.7JS-T4-AZ?
RD4.7JS-T4-AZ supports a non-repetitive surge reverse power (PRSM) of 2.4 W for pulse width t = 10 µs, as confirmed in Figure 9 of datasheet D13937EJ5V0DS00. This rating assumes single-event conditions and requires full thermal recovery before subsequent surges. Exceeding this limit risks irreversible junction damage.
Can RD4.7JS-T4-AZ be used in surface-mount designs?
No - RD4.7JS-T4-AZ uses a DO-34 axial glass package with leads intended for through-hole mounting. It is not compatible with SMT reflow or wave soldering. For surface-mount equivalents, consider Renesas' NSZ series or other SOD-123-packaged Zeners; RD4.7JS-T4-AZ must be manually inserted and soldered into plated-through holes.
What is the thermal resistance from junction to ambient for RD4.7JS-T4-AZ on a standard PCB?
RD4.7JS-T4-AZ has a junction-to-ambient thermal resistance (Rth-JA) of 375 °C/W when mounted on a 3 mm² copper pad (leaf copper, 0.035 mm thick), per Figure 7 in datasheet D13937EJ5V0DS00. This value scales inversely with copper area - doubling pad size reduces Rth-JA by ~25%, directly impacting safe continuous power dissipation.
RD4.7JS-T4-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:
- -
RD4.7JS-T4-AZ FAQ
1.How can I place an order for RD4.7JS-T4-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD4.7JS-T4-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 RD4.7JS-T4-AZ reliable?
The price and inventory of RD4.7JS-T4-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD4.7JS-T4-AZ is usually 5 days.
3.What payment methods are accepted for RD4.7JS-T4-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD4.7JS-T4-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD4.7JS-T4-AZ?
RD4.7JS-T4-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD4.7JS-T4-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 RD4.7JS-T4-AZ?
For technical support, including RD4.7JS-T4-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD4.7JS-T4-AZ requirements.
6.How does Aetrix verify that RD4.7JS-T4-AZ is sourced from the original manufacturer or authorized distributors?
All RD4.7JS-T4-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 RD4.7JS-T4-AZ meets industry standards.
7.What is the process for return or replacement of RD4.7JS-T4-AZ?
All RD4.7JS-T4-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD4.7JS-T4-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 RD4.7JS-T4-AZ part is unused and in its original packaging.
Return procedure for RD4.7JS-T4-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD4.7JS-T4-AZ Tags
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