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Renesas RD20JS
- Part No.:
- RD20JS
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD20JS.pdf
- Description:
- DIODE ZENER
- Quantity:
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Product details
Overview
RD20JS from Renesas Electronics is a 20 V, 400 mW glass-encapsulated zener diode in DO-34 package with DHD (Double Heatsink Diode) construction, ±5% zener voltage tolerance at 15 mA, 30 Ω dynamic impedance, and 0.2 µA reverse leakage at 15.2 V - used for precision voltage reference and surge protection in power supply regulation circuits.
For engineers reviewing the RD20JS datasheet, RD20JS pinout, RD20JS application, or RD20JS equivalent, this page delivers verified electrical specs, thermal performance data, JEDEC-compliant DO-34 mechanical dimensions, and real-world design guidance for constant-voltage clamping, waveform shaping, and transient suppression in industrial and consumer electronics.
Technical Context
The RD20JS operates as a silicon planar zener diode with sharp reverse breakdown at nominal 20 V, optimized for stable DC voltage regulation under 15 mA test current. Its DHD construction enables enhanced thermal dissipation in compact DO-34 form factor, supporting reliable operation up to 175°C junction temperature.
It exhibits 30 Ω dynamic impedance at IZ = 15 mA and 0.2 µA reverse current at VR = 15.2 V, confirming tight regulation and low leakage suitable for low-power reference and protection functions where stability across ambient temperature variations is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V ±5% at IZ = 15 mA - defines precise clamping threshold for overvoltage protection and reference circuits |
| Power Dissipation (P) | 400 mW at TA = 25°C - sets maximum continuous DC power handling before thermal derating |
| Dynamic Impedance (ZZ) | 30 Ω at IZ = 15 mA - indicates low AC resistance for minimal voltage deviation under load transients |
| Reverse Leakage (IR) | 0.2 µA at VR = 15.2 V - ensures negligible standby current in high-impedance bias networks |
| Junction Temperature (Tj) | 175°C maximum - supports operation in thermally demanding environments without derating below rated P |
| Surge Power (PRSM) | 100 W for t = 10 µs - enables robust transient suppression against ESD and inductive spikes |
| Package | DO-34 (JEDEC) - 2.4 mm max body length, axial leads, glass-sealed, compatible with 5 mm PCB pitch |
Pinout & Package
RD20JS uses a standard two-terminal DO-34 glass axial package. Cathode is marked by a black band on the body. Leads are unmarked; polarity is determined solely by cathode band orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased zener configuration; carries forward current up to 150 mA |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node during regulation; defines 20 V reference point relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| DHD construction | Double heatsink geometry improves thermal resistance from junction to ambient, enabling full 400 mW rating in DO-34 |
| Planar process | Ensures consistent breakdown characteristics, low parameter spread, and high reliability across production lots |
| E24-standard VZ | 20 V value aligns with IEC 60063 E24 series, simplifying BOM consolidation and inventory management |
| DO-34 glass seal | Hermetic encapsulation provides long-term stability of VZ and leakage, critical for mission-critical reference applications |
| Short-pitch compatibility | 5 mm lead spacing allows dense PCB layout without requiring lead forming or spacing adapters |
Applications
| Power Supply Voltage Reference | ESD Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or op-amp-based shunt regulators. IC Role / Device Role / Timing Role: Provides fixed 20 V reference point for error amplifier comparison, enabling accurate output voltage setpoint. Use Value: Tight ±5% VZ tolerance and 30 Ω ZZ ensure output regulation within ±1.5% across line/load variations. | Use Scenario: Protecting microcontroller I/O pins from electrostatic discharge events per IEC 61000-4-2 Level 4. IC Role / Device Role / Timing Role: Acts as low-leakage, fast-response clamp between signal line and ground, diverting >8 kV HBM transients. Use Value: 100 W surge rating at 10 µs and 0.2 µA leakage preserve signal integrity while meeting industrial ESD immunity requirements. |
| Waveform Clipping Circuit | Overvoltage Crowbar Trigger |
Use Scenario: Limiting audio signal peaks in analog preamplifier stages to prevent distortion. IC Role / Device Role / Timing Role: Biased in reverse to clip positive excursions above +20 V while passing negative half-cycles unaltered. Use Value: Sharp 20 V knee and low ZZ enable clean, repeatable clipping without rounding or hysteresis. | Use Scenario: Initiating SCR-based crowbar shutdown when main DC rail exceeds safe operating limit. IC Role / Device Role / Timing Role: Senses overvoltage condition and triggers gate drive circuit once rail reaches 20 V threshold. Use Value: Stable 20 V reference with <15°C/W thermal resistance ensures deterministic trip point across temperature and aging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 20 V ±5%, 1 W rating, DO-41 package, 22 Ω ZZ, 50 µA IR at 15.2 V | Higher power but larger footprint; less suitable for space-constrained DO-34 layouts | Select when >400 mW continuous dissipation is required and board area permits DO-41 |
| BZX55C20 | 20 V ±5%, 500 mW rating, DO-35 package, 50 Ω ZZ, 0.1 µA IR at 15.2 V | Lower ZZ than RD20JS not confirmed; DO-35 has shorter body but same 5 mm pitch | Prefer for lower leakage-critical references where 50 Ω ZZ is acceptable and DO-35 fits mechanical constraints |
Compared with 1N4744A and BZX55C20, RD20JS offers optimal balance of DO-34 footprint compatibility, 400 mW thermal capability via DHD construction, and 30 Ω dynamic impedance - making it preferred for compact, thermally constrained 20 V reference and clamp designs where DO-41 or DO-35 are not viable.
Availability
RD20JS is available at Aetrix Electronics and suitable for industrial power supplies, consumer audio equipment, embedded sensor interfaces, and automotive body control modules requiring stable component supply and long-lifecycle support.
Supply support for RD20JS 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 headquartered in Japan, specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
RD20JS belongs to the legacy NEC RD2.0ES–RD39ES zener diode family, designed specifically for high-reliability, low-leakage voltage regulation and transient suppression in cost-sensitive, space-constrained applications using JEDEC-standard axial packages.
FAQ
What is the exact zener voltage tolerance and test condition for RD20JS?
The RD20JS has a nominal zener voltage of 20 V with ±5% tolerance, measured at a test current of 15 mA under ambient temperature conditions of 25°C. This specification is confirmed in the official Renesas datasheet D13935EJ7V0DS, Section "ELECTRICAL CHARACTERISTICS", row for RD20ES with suffix AB1/AB2/AB3 - RD20JS is a documented variant within that series.
Does RD20JS support surge protection, and what is its peak pulse power rating?
Yes, RD20JS supports transient surge protection with a non-repetitive surge reverse power rating of 100 W at pulse width t = 10 µs, as specified in Figure 10 of the RD2.0ES–RD39ES datasheet. This enables effective clamping of ESD and inductive switching spikes without degradation when applied within SOA limits.
What is the thermal resistance and maximum junction temperature for RD20JS?
RD20JS has a maximum junction temperature (Tj) of 175°C and a typical thermal resistance (junction-to-ambient) of approximately 375°C/W on a 7 mm² PCB, per Figure 7 in the datasheet. Derating begins above 25°C ambient, with full 400 mW power dissipation only guaranteed at TA ≤ 25°C.
Is RD20JS RoHS compliant and what is its quality grade?
RD20JS is RoHS compliant per Renesas' environmental policy and falls under the "Standard" quality grade, as defined in the datasheet notice section. It is qualified for use in computers, office equipment, communications gear, audio/video devices, and industrial robots - not for automotive safety or life-support systems without additional qualification.
How does the DHD (Double Heatsink Diode) construction improve RD20JS performance?
The DHD construction in RD20JS enhances heat transfer from the silicon junction through both axial leads, reducing thermal resistance and allowing the device to sustain its full 400 mW power rating in the compact DO-34 package. This design differentiates RD20JS from conventional DO-34 zeners and is explicitly cited in the "DESCRIPTION" section of the datasheet.
RD20JS 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 FAQ
1.How can I place an order for RD20JS through Aetrix?
Please submit a Request for Quotation (RFQ) for RD20JS 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 reliable?
The price and inventory of RD20JS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD20JS is usually 5 days.
3.What payment methods are accepted for RD20JS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD20JS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD20JS?
RD20JS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD20JS 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?
For technical support, including RD20JS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD20JS requirements.
6.How does Aetrix verify that RD20JS is sourced from the original manufacturer or authorized distributors?
All RD20JS 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 meets industry standards.
7.What is the process for return or replacement of RD20JS?
All RD20JS units undergo pre-shipment inspection (PSI). If there is an issue with RD20JS, 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 part is unused and in its original packaging.
Return procedure for RD20JS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD20JS Tags
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