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Renesas RD20F
- Part No.:
- RD20F
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD20F.pdf
- Description:
- DIODE ZENER
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Product details
Overview
RD20F from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed DHD package, rated for 19.59–20.84 V zener voltage at 20 mA test current, with 14 Ω dynamic impedance and −17 mV/°C temperature coefficient. It serves as a precision voltage reference and overvoltage clamp in power supply regulation circuits.
For engineers reviewing the RD20F datasheet, RD20F pinout, RD20F application, or RD20F equivalent, this page delivers verified electrical specs, thermal derating curves, surge handling capability (400 W @ 10 μs), and direct alternative part comparisons for stable voltage reference design and transient suppression implementation.
Technical Context
The RD20F operates as a two-terminal voltage-regulating device relying on reverse-biased Zener breakdown. Its planar junction structure ensures stable breakdown characteristics and low leakage across temperature (−65 to +175°C storage, 175°C max junction).
It exhibits a negative temperature coefficient of −17 mV/°C at 20 mA, indicating decreasing zener voltage with rising temperature - critical for thermal drift compensation in analog references. The DO-41 package provides defined thermal resistance (Rth) dependent on PCB copper area, enabling predictable power derating above 25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.59–20.84 V at IZ = 20 mA - defines nominal regulation point with ±3.1% tolerance |
| Dynamic Impedance (ZZ) | 14 Ω max at IZ = 20 mA - determines output voltage stability under load current variation |
| Power Dissipation (P) | 1.0 W at TA = 25°C - sets maximum continuous DC power before thermal shutdown or degradation |
| Surge Reverse Power (PRSM) | 400 W for t = 10 μs - enables single-pulse transient suppression without failure |
| Reverse Current (IR) | 10 μA max at VR = 15 V - specifies leakage level below breakdown, critical for low-power bias networks |
| Temp. Coefficient (γZ) | −17 mV/°C at IZ = 20 mA - quantifies voltage drift per degree, used for thermal error budgeting |
| Junction Temperature (Tj) | 175°C max - constrains heatsinking and ambient operating envelope in enclosed systems |
Pinout & Package
RD20F is a two-terminal axial-leaded device in JEDEC DO-41 glass package (3.0 mm Ø × 5.0 mm L), with cathode indicated by black band. No internal pin numbering applies - anode and cathode are unidirectional terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to lower-potential side in reverse-bias configuration; establishes common return path |
| Cathode | Zener breakdown terminal / Regulated output node | Marked with black band; supplies stable voltage when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| 1 W Planar Zener Structure | Enables stable, repeatable breakdown with low long-term drift and high reliability in industrial environments |
| E24-Series Voltage Standardization | Supports BOM consolidation across 2–82 V range using industry-standard nominal values |
| DHD (Double Heatsink Diode) Package | Optimizes thermal transfer through axial leads and glass body, improving power handling vs. standard DO-41 |
| B3 Voltage Grade Option | Provides tightest tolerance bin (19.59–20.84 V) for applications requiring precise regulation without trimming |
| −65 to +175°C Operating Range | Validates use in extended-temperature industrial and automotive under-hood subsystems |
Applications
| Power Supply Voltage Reference | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Stabilizing feedback node in linear regulator or switching converter error amplifier. IC Role / Device Role / Timing Role: Provides fixed reference voltage against which output is compared; sets regulation accuracy. Use Value: 14 Ω dynamic impedance minimizes output voltage shift under load transients, maintaining ±1% regulation over 5–25 mA current range. |
Use Scenario: Protecting microcontroller I/O pins from ESD or inductive kickback exceeding 20 V. IC Role / Device Role / Timing Role: Shunts excess energy to ground once reverse voltage exceeds 20.84 V threshold. Use Value: 400 W surge rating at 10 μs allows absorption of IEC 61000-4-2 Level 4 ESD events without degradation. |
| Waveform Clipping | Current Source Biasing |
Use Scenario: Limiting audio signal peaks in analog preamplifier stage to prevent distortion. IC Role / Device Role / Timing Role: Acts as bidirectional limiter when paired with series resistor and forward diode. Use Value: Sharp 20 V breakdown knee enables clean clipping with minimal harmonic generation below threshold. |
Use Scenario: Generating stable bias current for op-amp input stages or transistor amplifiers. IC Role / Device Role / Timing Role: Sets constant current via series resistor (e.g., 1 kΩ yields ~20 mA at 20 V). Use Value: −17 mV/°C tempco allows predictable current drift (<±0.1 mA/°C), simplifying thermal compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4746A (ON Semiconductor) | 20 V nominal, ±5% tolerance (19–21 V), 22 Ω ZZ, DO-41, same PD = 1 W | Wider voltage tolerance and higher dynamic impedance reduce regulation precision in reference designs | Select when cost sensitivity outweighs tight VZ control; verify thermal margin due to higher ZZ-induced self-heating |
| BZX55-C20 (Vishay) | 20 V nominal, ±5% tolerance, 50 Ω ZZ, DO-35, PD = 500 mW | Lower power rating and higher impedance limit use to low-current biasing, not clamping or regulation | Use only in space-constrained, low-power signal conditioning; avoid in >10 mA load or surge-prone locations |
Compared with RD20F, the 1N4746A offers broader availability but sacrifices regulation accuracy and thermal stability, while the BZX55-C20 trades power handling and impedance performance for smaller footprint - making RD20F optimal for industrial-grade 1 W reference and clamping where precision and ruggedness are prioritized.
Availability
RD20F is available at Aetrix Electronics and suitable for industrial power supplies, embedded system protection circuits, and analog signal conditioning requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for RD20F 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 via merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices for industrial and automotive markets.
RD20F belongs to the RD2.0F–RD82F planar Zener diode family designed for standardized, high-reliability voltage regulation and transient suppression in industrial-grade equipment operating across extended temperature ranges.
FAQ
What is the exact zener voltage range for RD20F at 20 mA test current?
The RD20F has a guaranteed zener voltage range of 19.59 V to 20.84 V when measured at IZ = 20 mA and TA = 25°C, corresponding to its B3 grade classification per Renesas datasheet D13936EJ5V0DS. This 3.1% tolerance window ensures consistent regulation behavior across production lots without user trimming.
Does RD20F support surge protection, and what is its peak pulse power rating?
Yes, RD20F supports transient suppression with a surge reverse power rating of 400 W for a 10 μs pulse width at TA = 25°C, as specified in Figure 7 of the official datasheet. This enables reliable clamping of short-duration overvoltage events such as ESD or inductive spikes without permanent damage to the RD20F device.
What is the thermal resistance characteristic of RD20F, and how does it affect power derating?
RD20F's thermal resistance (Rth) depends on PCB copper area: 240°C/W at S = 5 mm², 120°C/W at S = 20 mm² (Figure 2). This means power dissipation must be reduced linearly above 25°C ambient - e.g., at 80°C ambient with 20 mm² copper, max power drops to ~0.55 W - ensuring junction temperature stays ≤175°C for RD20F reliability.
Can RD20F be used as a precision voltage reference in analog circuits?
RD20F can serve as a cost-effective voltage reference in non-critical analog circuits, with −17 mV/°C temperature coefficient and 14 Ω dynamic impedance. However, its ±3.1% initial tolerance and thermal drift make it unsuitable for high-accuracy references; it is best applied in power supply feedback, clamping, or biasing where ±5% absolute accuracy is acceptable for RD20F operation.
Is RD20F RoHS compliant, and what is its lead-free status?
RD20F complies with EU RoHS Directive requirements as confirmed by Renesas Electronics' environmental compliance documentation. The device uses lead-free terminations and halogen-free packaging materials, meeting the substance restrictions defined in Directive 2011/65/EU - essential for RD20F deployment in modern commercial and industrial electronics manufacturing.
RD20F 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:
- -
RD20F FAQ
1.How can I place an order for RD20F through Aetrix?
Please submit a Request for Quotation (RFQ) for RD20F 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 RD20F reliable?
The price and inventory of RD20F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD20F is usually 5 days.
3.What payment methods are accepted for RD20F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD20F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD20F?
RD20F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD20F 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 RD20F?
For technical support, including RD20F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD20F requirements.
6.How does Aetrix verify that RD20F is sourced from the original manufacturer or authorized distributors?
All RD20F 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 RD20F meets industry standards.
7.What is the process for return or replacement of RD20F?
All RD20F units undergo pre-shipment inspection (PSI). If there is an issue with RD20F, 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 RD20F part is unused and in its original packaging.
Return procedure for RD20F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD20F Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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