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Renesas RD20JS-AZ
- Part No.:
- RD20JS-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD20JS-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:5,600
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Product details
Overview
RD20JS-AZ from Renesas Electronics is a 400 mW, DO-34 glass-sealed Zener diode with nominal zener voltage 20 V (18.86–21.08 V at 5 mA), low dynamic impedance (Zz ≤ 100 Ω), sharp breakdown characteristic, and low noise performance - used for precision voltage regulation and waveform clipping in analog signal conditioning circuits.
For engineers reviewing the RD20JS-AZ datasheet, RD20JS-AZ pinout, RD20JS-AZ application, or RD20JS-AZ equivalent, this page delivers verified electrical specs, thermal behavior, package dimensions, and real-world selection guidance for stable voltage reference design in industrial and consumer electronics.
Technical Context
The RD20JS-AZ operates as a two-terminal silicon Zener diode in reverse-biased mode, delivering stable voltage regulation via controlled avalanche breakdown. Its DHD (Double Heatsink Diode) construction enables 400 mW steady-state power dissipation at 25 °C ambient and supports surge reverse power up to 2.4 W for 10 µs pulses.
It exhibits a positive temperature coefficient of +0.06 %/°C (≈12 mV/°C) near 20 V, low knee impedance (Zzk ≤ 100 Ω), and noise level ≤ 30 µV (10–500 kHz), making it suitable for low-drift reference and low-noise biasing applications where stability under varying load and temperature is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 18.86–21.08 V at 5 mA - defines usable regulation window under standard test conditions; tight tolerance supports ±5% reference accuracy. |
| Power Dissipation (P) | 400 mW at TA = 25 °C - sets maximum continuous DC power handling; derates linearly above 25 °C per Fig. 5. |
| Dynamic Impedance (Zz) | ≤100 Ω at Iz = 5 mA - ensures minimal output voltage variation under load current changes; critical for regulation stability. |
| Reverse Current (IR) | ≤0.1 µA at VR = 15 V - guarantees low leakage in off-state; essential for high-impedance bias networks. |
| Junction Temperature (Tj) | 175 °C maximum - determines thermal safety margin; requires PCB copper area ≥5 mm² for full-rated power. |
| Noise Level (en) | ≤30 µV (10–500 kHz) - enables use in low-noise analog references without added filtering. |
| Surge Power (PRSM) | 2.4 W for t = 10 µs - allows transient overvoltage clamping in protection circuits without failure. |
Pinout & Package
RD20JS-AZ uses a DO-34 (JEDEC) axial glass package with cathode indicated by a blue band. It has two terminals: anode and cathode - no internal connections or control pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential node when used in reverse-bias regulation. |
| Cathode | Zener voltage output terminal | Provides regulated voltage referenced to anode; marked with blue band on DO-34 body. |
Key Features
| Feature | Design Value |
|---|---|
| DO-34 glass sealed package | Hermetic sealing ensures long-term parameter stability and moisture resistance in humid environments. |
| Sharp breakdown characteristic | Enables clean, predictable turn-on at rated Vz - reduces ambiguity in threshold detection and clamping. |
| Low noise (≤30 µV) | Minimizes injected noise into sensitive analog stages - avoids need for external RC filtering in reference paths. |
| DHD (Double Heatsink Diode) construction | Improves thermal conduction from junction to leads - supports higher sustained power vs. standard DO-34 diodes. |
| Vz aligned to E24 standard | Ensures compatibility with industry-standard resistor and reference value planning across design teams. |
Applications
| Industrial Sensor Signal Conditioning | Consumer Audio Bias Supply |
|---|---|
Use Scenario: Stabilizing op-amp bias voltages in 4–20 mA transmitter front-ends operating across –40 to +85 °C ambient. IC Role / Device Role / Timing Role: Zener reference providing fixed 20 V rail for current-loop driver ICs and precision ADC references. Use Value: Maintains <±1.5% output drift over temperature due to low Zz and predictable γz, eliminating need for trimming. |
Use Scenario: Generating clean, low-noise virtual ground for dual-supply headphone amplifiers in portable Bluetooth speakers. IC Role / Device Role / Timing Role: Low-noise 20 V reference feeding rail-splitter op-amps to establish mid-rail bias point. Use Value: Delivers ≤30 µV broadband noise - prevents audible hiss and preserves SNR >105 dB in audio path. |
| Programmable Logic Controller I/O Protection | Test Equipment Voltage Clamp |
Use Scenario: Clamping 24 V digital input lines against ESD and inductive kickback in PLC backplanes. IC Role / Device Role / Timing Role: Fast-response surge limiter absorbing 2.4 W transients while holding line voltage ≤21.1 V. Use Value: Survives repeated 10 µs surges without parameter shift - extends field lifetime beyond 10⁵ cycles. |
Use Scenario: Protecting DMM input stages during overvoltage events in benchtop calibration setups. IC Role / Device Role / Timing Role: Precision clamp limiting input to exactly 20 V ±0.1 V before ADC front-end. Use Value: Sharp knee and low Zz ensure clamping threshold remains stable across 1–10 mA fault currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A (ON Semiconductor) | 20 V nominal, 1 W rating, DO-41 package, Zz ≈ 22 Ω at 25 mA - lower impedance but higher power and larger footprint. | Preferred in high-current regulation (>20 mA); unsuitable for space-constrained DO-34 layouts. | Select when higher power headroom and lower Zz outweigh board space constraints. |
| BZX55C20 (Vishay) | 20 V nominal, 500 mW rating, DO-35 package, Zz ≈ 50 Ω at 5 mA - tighter Vz tolerance (±5%), same noise profile. | Better suited for metrology-grade references requiring tighter initial calibration; DO-35 slightly longer than DO-34. | Choose for improved Vz consistency in production calibration without changing circuit topology. |
Compared with 1N4744A and BZX55C20, RD20JS-AZ offers optimal balance of compact DO-34 size, 400 mW capability, and low-noise performance - making it ideal for space-limited industrial modules where thermal management and signal integrity are jointly constrained.
Availability
RD20JS-AZ is available at Aetrix Electronics and suitable for industrial sensor interfaces, consumer audio bias supplies, and programmable logic controller I/O protection requiring stable component supply and long-term parametric consistency.
Supply support for RD20JS-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog power devices, and discrete components for industrial, automotive, and consumer systems.
The RD series Zener diodes were designed for precision voltage reference and waveform shaping in cost-sensitive, high-reliability analog circuits - emphasizing low noise, sharp knee, and stable thermal behavior in miniature glass packages.
FAQ
What is the exact zener voltage range for RD20JS-AZ at 5 mA?
The RD20JS-AZ has a guaranteed zener voltage range of 18.86 V to 21.08 V when tested at 5 mA DC current and 25 °C ambient temperature, per Renesas datasheet D13937EJ5V0DS00. This corresponds to the AB1–AB3 suffix variants within the RD20JS family, and the RD20JS-AZ specifically aligns with the AB2 variant (19.52–20.39 V).
Can RD20JS-AZ be used in place of a 20 V Zener in a low-noise audio reference?
Yes - RD20JS-AZ delivers ≤30 µV RMS noise (10–500 kHz), sharp breakdown, and low dynamic impedance (≤100 Ω), making it well-suited for low-noise audio bias rails. Its DO-34 package fits dense layouts, and its stable γz minimizes thermal drift in amplifier virtual-ground circuits - all confirmed in Renesas' Fig. 8 and Fig. 6.
What is the maximum allowable ambient temperature for full 400 mW operation of RD20JS-AZ?
RD20JS-AZ is rated for 400 mW only at TA = 25 °C. According to Fig. 5 in the official datasheet, power must be linearly derated above 25 °C - reaching 0 mW at ~160 °C. For continuous 400 mW operation, ambient temperature must remain at or below 25 °C, with adequate PCB copper area (≥5 mm²) to maintain junction temperature ≤175 °C.
Does RD20JS-AZ have a specified surge rating, and how is it applied?
Yes - RD20JS-AZ supports non-repetitive surge reverse power of 2.4 W for pulse width t = 10 µs, as shown in Fig. 9 of the datasheet. This rating applies to transient overvoltage events like ESD or inductive switching spikes, provided pulse repetition is infrequent and average power remains within 400 mW limits.
How does the temperature coefficient of RD20JS-AZ affect its regulation accuracy over –40 to +85 °C?
RD20JS-AZ has a measured zener voltage temperature coefficient γz of +0.06 %/°C (≈+12 mV/°C at 20 V), per Fig. 6. Over –40 to +85 °C (ΔT = 125 °C), total Vz shift is ~±0.75 V - well within its 18.86–21.08 V specification band. This predictability enables first-pass accuracy in industrial designs without active compensation.
RD20JS-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:
- -
RD20JS-AZ FAQ
1.How can I place an order for RD20JS-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD20JS-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 RD20JS-AZ reliable?
The price and inventory of RD20JS-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD20JS-AZ is usually 5 days.
3.What payment methods are accepted for RD20JS-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD20JS-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD20JS-AZ?
RD20JS-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD20JS-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 RD20JS-AZ?
For technical support, including RD20JS-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD20JS-AZ requirements.
6.How does Aetrix verify that RD20JS-AZ is sourced from the original manufacturer or authorized distributors?
All RD20JS-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 RD20JS-AZ meets industry standards.
7.What is the process for return or replacement of RD20JS-AZ?
All RD20JS-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD20JS-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 RD20JS-AZ part is unused and in its original packaging.
Return procedure for RD20JS-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD20JS-AZ Tags
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