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Renesas RD20ES-AZ
- Part No.:
- RD20ES-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD20ES-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:7,200
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Product details
Overview
RD20ES-AZ from Renesas Electronics is a 400 mW, 20 V ±5% zener diode in DO-34 glass package with DHD (Double Heatsink Diode) construction, designed for precision voltage regulation and surge suppression in low-power analog circuits and power supply feedback paths.
For engineers reviewing the RD20ES-AZ datasheet, RD20ES-AZ pinout, RD20ES-AZ application, or RD20ES-AZ equivalent, this part serves as a stable, low-leakage (IR ≤ 0.2 µA at VR = 15 V), low-impedance (ZZ ≤ 30 Ω at IZ = 5 mA) zener reference in constant-voltage clamping, overvoltage protection, and waveform shaping circuits where thermal stability and compact through-hole mounting are required.
Technical Context
This planar-processed zener diode uses double heatsink construction to enhance thermal dissipation within the DO-34 glass envelope, enabling reliable 400 mW operation at TA = 25°C and junction temperature up to 175°C. Its E24-standardized zener voltage (20.23–20.45 V) ensures compatibility with common reference design requirements.
Dynamic impedance is specified at 30 Ω maximum (IZ = 5 mA), with knee impedance ZZK ≤ 200 Ω (IZ = 0.5 mA), supporting stable regulation across light-to-moderate load conditions. Reverse leakage remains below 0.2 µA at 15 V, critical for low-power biasing and sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.23–20.45 V at IZ = 5 mA - precise regulation point compliant with E24 standard for 20 V nominal rating |
| Power Dissipation (P) | 400 mW - enables use in compact through-hole designs without forced cooling |
| Dynamic Impedance (ZZ) | ≤30 Ω at IZ = 5 mA - ensures minimal output voltage variation under changing load current |
| Reverse Leakage (IR) | ≤0.2 µA at VR = 15 V - preserves accuracy in high-impedance reference nodes |
| Surge Power (PRSM) | 100 W (t = 10 µs) - provides transient overvoltage resilience in unprotected input stages |
| Junction Temperature (Tj) | 175°C - supports operation in elevated ambient environments such as industrial control enclosures |
| Package | DO-34 (JEDEC) - 2.4 mm max body length, 5 mm lead pitch, glass-sealed, axial leads for wave soldering |
Pinout & Package
DO-34 glass axial package: cylindrical glass body with two tinned copper alloy leads; cathode indicated by black band near one end. Leads are unmarked but polarity follows standard diode convention - banded end is cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward conduction terminal / Zener reference ground node | Connected to circuit ground or lower-potential rail when used in shunt regulation |
| Cathode (banded end) | Zener breakdown terminal / regulated output node | Provides stable 20.23–20.45 V reference relative to anode; must be biased above anode by ≥VZ |
Key Features
| Feature | Design Value |
|---|---|
| DHD (Double Heatsink Diode) construction | Improves thermal resistance from junction to ambient, sustaining 400 mW in compact DO-34 outline |
| Planar process technology | Delivers tight VZ tolerance (±5%), low ZZ, and repeatable knee characteristics across production lots |
| E24-standard zener voltage | Ensures interoperability with industry-standard reference designs and BOM consolidation |
| Low IR at sub-VZ reverse bias | Minimizes error in high-Z feedback networks and battery-powered sensor references |
| DO-34 glass seal | Provides hermetic reliability, moisture resistance, and compatibility with automated through-hole assembly |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Stabilizing output voltage of isolated flyback or buck converter via optocoupler feedback loop. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 20.23–20.45 V threshold to TL431 or similar error amplifier. Use Value: Enables ±1% output regulation accuracy while maintaining low quiescent current draw (<100 µA) in standby mode. |
Use Scenario: Protecting 3.3 V or 5 V GPIO pins from accidental 12–24 V transients on industrial fieldbus lines. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting pin voltage to ≤20.5 V during surge events. Use Value: Absorbs 100 W surges (10 µs) without degradation, preventing latch-up or oxide damage in connected logic ICs. |
| Waveform Clipping in Signal Conditioning | Temperature-Stable Bias Generator |
Use Scenario: Limiting audio or sensor signal amplitude to prevent ADC saturation in data acquisition front-ends. IC Role / Device Role / Timing Role: Symmetric or asymmetric clipping element defining upper/lower signal bounds. Use Value: Provides sharp, repeatable 20.23–20.45 V clipping threshold with <30 Ω dynamic impedance for minimal distortion. |
Use Scenario: Generating a stable bias current for op-amp input stages or transistor amplifiers in instrumentation circuits. IC Role / Device Role / Timing Role: Precision current source formed with series resistor and RD20ES-AZ zener reference. Use Value: Delivers <0.2 µA leakage and <100 ppm/°C tempco (per Fig. 9), ensuring bias stability over –40°C to +125°C ambient. |
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 @ 5 mA, IR = 5 µA @ 16 V | Higher power handling but larger footprint and higher leakage; less suitable for space-constrained, ultra-low-IQ designs | Choose when >400 mW continuous dissipation is required and board area permits DO-41 |
| BZX55C20 (Vishay) | 20 V nominal, 500 mW, DO-35 package, ZZ = 50 Ω @ 5 mA, IR = 0.1 µA @ 15 V | Lower leakage but higher dynamic impedance; smaller DO-35 body limits heat spreading vs. DHD construction | Choose when lowest possible IR is critical and thermal stress is minimal (e.g., signal-level referencing) |
Compared with 1N4744A and BZX55C20, RD20ES-AZ offers superior thermal performance per unit volume due to DHD construction, tighter leakage control than 1N4744A, and lower ZZ than BZX55C20-making it optimal for compact, low-power, high-stability shunt regulation where DO-34 mounting is preferred.
Availability
RD20ES-AZ is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp for microcontroller I/O, and waveform clipping in signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for RD20ES-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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and consumer applications.
RD20ES-AZ belongs to the legacy NEC RD2.0ES–RD39ES zener diode family, engineered for high-reliability, low-leakage voltage reference and transient suppression in cost-sensitive, space-constrained through-hole designs.
FAQ
What is the exact zener voltage range for RD20ES-AZ at 5 mA test current?
The RD20ES-AZ exhibits a zener voltage range of 20.23 V to 20.45 V when measured at IZ = 5 mA and TA = 25°C, per the "AB1" suffix row in the official Renesas datasheet D13935EJ7V0DS. This 1.1% tolerance reflects E24-standard compliance and is verified under pulsed test conditions (40 ms).
Does RD20ES-AZ have a specified temperature coefficient, and how does it affect regulation accuracy?
Yes, RD20ES-AZ has a typical zener voltage temperature coefficient (γZ) of approximately +0.06 %/°C (or +12 mV/°C) near 20 V, as shown in Figure 9 of the datasheet. This positive tempco means output voltage rises ~12 mV per °C increase in junction temperature-critical for designs operating across –40°C to +125°C ambient ranges.
Can RD20ES-AZ be used in surface-mount assemblies?
No, RD20ES-AZ is exclusively packaged in the axial DO-34 glass case and is not compatible with SMT processes. It requires through-hole mounting with 5 mm lead pitch. For surface-mount equivalents, consider Renesas' NZ9F20V (SOD-323) or similar SMT zeners-not drop-in replacements for RD20ES-AZ.
What is the maximum surge reverse power RD20ES-AZ can withstand, and under what conditions?
RD20ES-AZ is rated for 100 W non-repetitive surge reverse power (PRSM) at pulse width t = 10 µs, as defined in Figure 10 of the datasheet. This capability applies only to single, isolated transients; repeated surges require derating based on thermal time constants shown in Figure 11 (transient thermal impedance).
Is RD20ES-AZ RoHS compliant, and what is its lead finish?
RD20ES-AZ features matte tin-plated leads and meets RoHS Directive 2011/65/EU requirements, consistent with Renesas' environmental compliance policy stated in the datasheet notice section. The DO-34 glass body contains no restricted substances above threshold limits.
RD20ES-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:
- -
RD20ES-AZ FAQ
1.How can I place an order for RD20ES-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD20ES-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 RD20ES-AZ reliable?
The price and inventory of RD20ES-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD20ES-AZ is usually 5 days.
3.What payment methods are accepted for RD20ES-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD20ES-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD20ES-AZ?
RD20ES-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD20ES-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 RD20ES-AZ?
For technical support, including RD20ES-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD20ES-AZ requirements.
6.How does Aetrix verify that RD20ES-AZ is sourced from the original manufacturer or authorized distributors?
All RD20ES-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 RD20ES-AZ meets industry standards.
7.What is the process for return or replacement of RD20ES-AZ?
All RD20ES-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD20ES-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 RD20ES-AZ part is unused and in its original packaging.
Return procedure for RD20ES-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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