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Renesas RD22F-AZ
- Part No.:
- RD22F-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD22F-AZ.pdf
- Description:
- DIODE ZENER
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Inventory:1,600
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Product details
Overview
RD22F-AZ from Renesas Electronics is a 1 W planar silicon zener diode with a nominal zener voltage of 22 V (B3 grade: 21.75–22.86 V), dynamic impedance of 14 Ω at 10 mA, and temperature coefficient of +17 mV/°C. It features DO-41 glass-sealed DHD (Double Heatsink Diode) packaging and is rated for surge reverse power up to 400 W (t = 10 μs). It is used in precision voltage reference and overvoltage protection circuits in industrial power supplies.
For engineers reviewing the RD22F-AZ datasheet, RD22F-AZ pinout, RD22F-AZ application, or RD22F-AZ equivalent, this page delivers verified electrical parameters, JEDEC DO-41 terminal mapping, thermal derating curves, zener voltage tolerance grades (B/B1/B2/B3), and direct alternative parts with documented voltage and impedance differences.
Technical Context
The RD22F-AZ operates as a two-terminal voltage reference device relying on controlled reverse-biased avalanche breakdown. Its zener voltage is specified at IZ = 10 mA with ±5% tolerance (B3 grade), and its positive temperature coefficient (+17 mV/°C) indicates stable regulation above ~5 V. The planar junction structure ensures repeatable breakdown characteristics and low noise.
Thermal performance is defined by a 175°C maximum junction temperature and transient thermal impedance of ~150°C/W at 10 ms. The DO-41 package enables through-hole mounting with 25 mm minimum lead spacing and 5 mm maximum body length, supporting standard PCB layout practices for 1 W dissipation with adequate copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 21.75–22.86 V at IZ = 10 mA (B3 grade); defines precise clamping threshold for overvoltage protection. |
| Dynamic Impedance (ZZ) | 14 Ω max at IZ = 10 mA; ensures minimal output voltage variation under load current changes. |
| Power Dissipation (P) | 1.0 W at TA = 25°C; requires thermal derating above 25°C per Figure 1 (e.g., ~0.6 W at 100°C ambient). |
| Reverse Current (IR) | ≤10 μA at VR = 17 V; guarantees low leakage in standby or high-impedance bias networks. |
| Temp. Coefficient (γZ) | +17 mV/°C typical; enables predictable drift compensation in temperature-stable references. |
| Surge Power (PRSM) | 400 W for t = 10 μs (non-repetitive); supports transient suppression of ESD or inductive kick events. |
| Junction Temp. (Tj) | 175°C max; sets absolute upper limit for thermal design margin in enclosed or high-ambient environments. |
Pinout & Package
RD22F-AZ uses the JEDEC DO-41 axial-leaded glass package: cylindrical black-marked body (φ3.0 mm max, 5 mm long), cathode indicated by black band, 25 mm minimum lead spacing, and 0.8 mm lead diameter. Leads are tinned copper-clad steel for solderability and mechanical strength.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage reference node | Connected to circuit ground or lower potential; forms reference return path in shunt regulator topology. |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input rail or protected node; maintains stable voltage relative to anode during reverse bias. |
Key Features
| Feature | Design Value |
|---|---|
| E24-standardized voltage series | Enables BOM consolidation across 2–82 V range without custom binning or calibration. |
| B1/B2/B3 voltage grading | Allows selection of tighter tolerance subsets (±1.5% to ±2.5%) within same base part number. |
| Planar junction construction | Delivers consistent ZZ, low noise, and improved reliability vs. alloy-junction alternatives. |
| DHD (Double Heatsink Diode) structure | Improves thermal resistance via dual heat paths-leads and glass body-to sustain 1 W operation. |
| DO-41 mechanical standardization | Ensures compatibility with automated insertion equipment and legacy board designs. |
Applications
| Voltage Reference Circuit | Overvoltage Protection |
|---|---|
Use Scenario: Stable 22 V reference for ADC biasing or op-amp feedback in industrial sensor signal conditioning. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed potential against which analog signals are measured. Use Value: Low 14 Ω ZZ minimizes reference error under varying load currents, improving measurement accuracy. |
Use Scenario: Clamping 24 V DC supply rail against transients from relay switching or motor commutation. IC Role / Device Role / Timing Role: Passive overvoltage clamp absorbing energy during surge events. Use Value: 400 W surge rating (10 μs) safely diverts inductive spikes without degradation or failure. |
| Waveform Clipping | Constant-Current Bias |
Use Scenario: Limiting audio amplifier input signal amplitude to prevent distortion in consumer audio preamps. IC Role / Device Role / Timing Role: Bidirectional limiter using forward diode drop (0.7 V) and reverse zener action (22 V). Use Value: Sharp knee at 22 V enables clean clipping with minimal harmonic generation in analog signal paths. |
Use Scenario: Setting bias current for LED driver ICs or phototransistor amplifiers in optical encoders. IC Role / Device Role / Timing Role: Current-setting element in series with a resistor to establish stable IZ. Use Value: Tight B3-grade voltage tolerance ensures repeatable current setting across production batches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4745A | Zener voltage 22 V ±5%, ZZ = 17 Ω max at 11 mA, DO-41, same PD = 1 W. | Slightly higher ZZ and different test current; less optimal for low-drift references. | Acceptable where 3 Ω higher impedance is tolerable; verify thermal layout matches RD22F-AZ derating curve. |
| BZX55C22 | Zener voltage 22 V ±5%, ZZ = 25 Ω max at 5 mA, DO-35, PD = 500 mW. | Lower power rating and higher impedance; unsuitable for 1 W continuous or high-surge use. | Only for space-constrained, low-power designs; not a drop-in replacement due to package and power mismatch. |
Compared with RD22F-AZ, 1N4745A offers near-identical voltage but higher dynamic impedance, while BZX55C22 sacrifices power handling and impedance performance for smaller size-making RD22F-AZ the preferred choice for robust 1 W reference and protection roles.
Availability
RD22F-AZ is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and programmable logic controller (PLC) I/O protection requiring stable component supply and long-term obsolescence management.
Supply support for RD22F-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 power devices.
RD22F-AZ belongs to the RD2.0F–RD82F planar zener diode family designed for standardized, high-reliability voltage regulation and transient suppression in industrial and commercial equipment.
FAQ
What is the exact zener voltage tolerance for RD22F-AZ?
The RD22F-AZ is specified in the B3 voltage grade, with a zener voltage range of 21.75 V to 22.86 V at IZ = 10 mA and TA = 25°C. This corresponds to a ±2.5% tolerance around the nominal 22 V value, as confirmed in the Electrical Characteristics table of Renesas document D13936EJ5V0DS.
Does RD22F-AZ have a positive or negative temperature coefficient?
RD22F-AZ has a positive temperature coefficient of +17 mV/°C (typical), meaning its zener voltage increases linearly with rising junction temperature. This behavior is characteristic of zener diodes above ~5 V and is explicitly listed in the Electrical Characteristics table for RD22F in the Renesas datasheet.
What is the maximum surge power rating for RD22F-AZ and under what conditions?
RD22F-AZ supports a non-repetitive surge reverse power of 400 W at pulse width t = 10 μs and TA = 25°C, as defined in the Absolute Maximum Ratings table. This rating applies only to single, short-duration transients-not repetitive or sustained overload conditions.
Is RD22F-AZ compatible with automated through-hole assembly?
Yes, RD22F-AZ uses the JEDEC-standard DO-41 package with 0.8 mm diameter leads, 25 mm minimum lead spacing, and axial symmetry-fully compatible with standard wave soldering and automated insertion equipment used in high-volume PCB manufacturing.
What is the dynamic impedance of RD22F-AZ and why does it matter?
RD22F-AZ has a maximum dynamic impedance of 14 Ω at IZ = 10 mA. This low value ensures minimal change in output voltage when load current varies, making it suitable for precision shunt regulation where stability under dynamic conditions is critical.
RD22F-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:
- -
RD22F-AZ FAQ
1.How can I place an order for RD22F-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD22F-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 RD22F-AZ reliable?
The price and inventory of RD22F-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD22F-AZ is usually 5 days.
3.What payment methods are accepted for RD22F-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD22F-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD22F-AZ?
RD22F-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD22F-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 RD22F-AZ?
For technical support, including RD22F-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD22F-AZ requirements.
6.How does Aetrix verify that RD22F-AZ is sourced from the original manufacturer or authorized distributors?
All RD22F-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 RD22F-AZ meets industry standards.
7.What is the process for return or replacement of RD22F-AZ?
All RD22F-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD22F-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 RD22F-AZ part is unused and in its original packaging.
Return procedure for RD22F-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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