My Inquiry
My Account
Renesas RD20F-T6-AZ
- Part No.:
- RD20F-T6-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD20F-T6-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:19,005
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
RD20F-T6-AZ from Renesas Electronics is a 1 W planar silicon Zener diode with nominal zener voltage of 20 V (B3 grade: 19.59–20.84 V), dynamic impedance of 14 Ω at 20 mA, and temperature coefficient of +15 mV/°C. It features DO-41 glass-sealed DHD (Double Heatsink Diode) packaging, rated for 175°C junction temperature, and is used in precision voltage regulation and surge suppression circuits in industrial power supplies.
For engineers reviewing the RD20F-T6-AZ datasheet, RD20F-T6-AZ pinout, RD20F-T6-AZ application, or RD20F-T6-AZ equivalent, this device serves as a standard-grade, single-anode/cathode discrete Zener for stable reference and clamping where ±5% voltage tolerance and low thermal drift are required.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled VZ tolerance (±3.1% for B3 grade), specified at IZ = 20 mA. Its DO-41 package provides dual heatsinking capability via axial leads and glass body, enabling reliable thermal dissipation up to 1 W at TA = 25°C with derating above 50°C.
The device exhibits a positive temperature coefficient (+15 mV/°C typical), indicating increasing VZ with rising junction temperature - a key consideration in ambient-variable designs. Surge reverse power rating is 400 W for t = 10 μs, supporting transient overvoltage protection in DC rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.59–20.84 V at IZ = 20 mA (B3 grade); defines stable regulation point under nominal bias. |
| Power Dissipation (P) | 1.0 W at TA = 25°C; usable up to 175°C junction temperature with linear derating. |
| Dynamic Impedance (ZZ) | 14 Ω max at IZ = 20 mA; determines output voltage stability under load current variation. |
| Reverse Current (IR) | ≤10 μA at VR = 15 V; ensures low leakage in high-impedance reference paths. |
| Temperature Coefficient (γZ) | +15 mV/°C typical; quantifies VZ drift per degree Celsius rise in junction temperature. |
| Surge Reverse Power (PRSM) | 400 W for 10 μs pulse; supports short-duration transient suppression without failure. |
Pinout & Package
RD20F-T6-AZ uses a DO-41 axial glass package with cathode indicated by a black band. The device has two terminals: anode and cathode - no internal connections or multi-pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reverse breakdown reference node | Connected to lower-potential side in Zener regulator; defines polarity for correct biasing. |
| Cathode | Zener breakdown terminal / regulated output node | Marked with black band; connected to higher-potential side; delivers stable VZ when reverse-biased. |
Key Features
| Feature | Design Value |
|---|---|
| Planar silicon construction | Ensures consistent breakdown characteristics and long-term parameter stability across production lots. |
| E24-series voltage grading | Enables standardized selection within 2–82 V range; RD20F-T6-AZ aligns with common 20 V system rails. |
| DHD (Double Heatsink Diode) structure | Improves thermal resistance via dual lead-to-body heat paths; supports sustained 1 W operation in compact layouts. |
| B3 voltage tolerance grade | ±3.1% VZ tolerance (19.59–20.84 V); tighter than general-purpose Zeners for improved reference accuracy. |
Applications
| Voltage Reference Circuit | Surge Absorption Circuit |
|---|---|
Use Scenario: Provides stable 20 V reference for ADC voltage dividers and op-amp bias networks in industrial sensor interfaces. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp reference node voltage. Use Value: Delivers <±3.1% VZ tolerance and +15 mV/°C TC, enabling sub-0.5% total reference error over 0–70°C ambient. |
Use Scenario: Protects 24 V DC input stages of PLC modules against ESD and inductive switching transients. IC Role / Device Role / Timing Role: Clamping device shunting excess energy to ground during overvoltage events. Use Value: Withstands 400 W surge (10 μs) and maintains <10 μA leakage at 15 V, minimizing standby power loss. |
| Waveform Clipper Circuit | Constant-Current Bias Circuit |
Use Scenario: Limits audio signal peaks in analog front-end stages of test equipment to prevent amplifier saturation. IC Role / Device Role / Timing Role: Bidirectional clipping element (with series diode) defining upper/lower amplitude bounds. Use Value: Low ZZ (14 Ω) ensures minimal distortion at clipping threshold; DO-41 package allows direct PCB mounting near signal path. |
Use Scenario: Sets bias current for LED drivers and phototransistor amplifiers in optical isolation circuits. IC Role / Device Role / Timing Role: Current-regulating element using Zener-voltage drop across series resistor. Use Value: Stable 20 V reference enables precise ILED control with <±5% current variation over temperature and supply drift. |
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 nominal, ±5% tolerance (19–21 V), ZZ = 22 Ω at 19 mA, DO-41 package. | Wider VZ tolerance and higher ZZ reduce regulation precision in low-drift references. | Acceptable for non-critical clamping; not recommended where B3-grade accuracy or low-impedance regulation is required. |
| BZX55-C20 | 20 V nominal, ±5% tolerance (19–21 V), ZZ = 50 Ω at 5 mA, DO-35 package (smaller, lower PD = 500 mW). | Lower power rating and higher impedance limit use in 1 W continuous or high-current regulation. | Suitable only for low-power signal-level clamping; insufficient for 1 W rail stabilization or surge absorption. |
Compared with RD20F-T6-AZ, both 1N4744A and BZX55-C20 offer similar nominal voltage but lack its B3-grade tolerance (±3.1%), 14 Ω dynamic impedance, and 1 W DO-41 DHD thermal performance - making RD20F-T6-AZ preferable for industrial-grade voltage reference and transient suppression where stability and power handling are critical.
Availability
RD20F-T6-AZ is available at Aetrix Electronics and suitable for industrial power supplies, PLC input protection, and sensor reference circuits requiring stable component supply with full traceability and lifecycle continuity.
Supply support for RD20F-T6-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 manufacturer formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and discrete power devices.
RD20F-T6-AZ belongs to the RD2.0F–RD82F planar Zener diode family, designed for standard-grade voltage regulation, clamping, and surge protection in industrial, office, and communications equipment.
FAQ
What is the exact zener voltage range for RD20F-T6-AZ?
The RD20F-T6-AZ has a guaranteed zener voltage range of 19.59 V to 20.84 V at IZ = 20 mA, corresponding to its B3 grade classification per Renesas datasheet D13936EJ5V0DS. This ±3.1% tolerance is tighter than standard B-grade Zeners and ensures predictable regulation in precision reference designs. RD20F-T6-AZ must be operated within this specified test condition to maintain compliance.
Does RD20F-T6-AZ support surge protection, and what is its peak rating?
Yes, RD20F-T6-AZ supports transient suppression with a surge reverse power rating (PRSM) of 400 W for a 10 μs pulse width at TA = 25°C, as defined in Figure 7 of the official datasheet. This capability enables use in DC rail protection against ESD and inductive kickback, provided layout minimizes parasitic inductance and thermal mass sustains brief power spikes. RD20F-T6-AZ is not rated for repetitive surges.
What is the thermal resistance and maximum junction temperature of RD20F-T6-AZ?
RD20F-T6-AZ has a maximum junction temperature (Tj) of 175°C and a transient thermal impedance (Zth) of 150°C/W at t = 1 s (Figure 8). Its DO-41 DHD structure improves heatsinking versus standard DO-41 diodes, allowing full 1 W dissipation at 25°C ambient with linear derating above 50°C. RD20F-T6-AZ requires adequate PCB copper area or heatsinking for sustained high-power operation.
How does the temperature coefficient of RD20F-T6-AZ affect circuit performance?
RD20F-T6-AZ has a typical zener voltage temperature coefficient (γZ) of +15 mV/°C, meaning its VZ increases by ~15 mV per °C rise in junction temperature. This positive drift must be factored into reference stability calculations - for example, a 50°C ΔT causes ~0.75 V shift. RD20F-T6-AZ is best suited for ambient-stable or compensated designs where this drift is acceptable or corrected.
Is RD20F-T6-AZ RoHS compliant and what quality grade does it carry?
RD20F-T6-AZ is RoHS compliant per Renesas environmental policy and carries the "Standard" quality grade, as confirmed in Section 7 of the datasheet notice. This grade authorizes use in computers, office equipment, communications gear, industrial robots, and test equipment - but not in automotive safety, medical life-support, or aerospace systems without explicit Renesas approval. RD20F-T6-AZ documentation confirms compliance with EU RoHS Directive requirements.
RD20F-T6-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:
- -
RD20F-T6-AZ FAQ
1.How can I place an order for RD20F-T6-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD20F-T6-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 RD20F-T6-AZ reliable?
The price and inventory of RD20F-T6-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD20F-T6-AZ is usually 5 days.
3.What payment methods are accepted for RD20F-T6-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD20F-T6-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD20F-T6-AZ?
RD20F-T6-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD20F-T6-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 RD20F-T6-AZ?
For technical support, including RD20F-T6-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD20F-T6-AZ requirements.
6.How does Aetrix verify that RD20F-T6-AZ is sourced from the original manufacturer or authorized distributors?
All RD20F-T6-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 RD20F-T6-AZ meets industry standards.
7.What is the process for return or replacement of RD20F-T6-AZ?
All RD20F-T6-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD20F-T6-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 RD20F-T6-AZ part is unused and in its original packaging.
Return procedure for RD20F-T6-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD20F-T6-AZ Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
