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Renesas RD22ES-T4-AZ
- Part No.:
- RD22ES-T4-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD22ES-T4-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
RD22ES-T4-AZ from Renesas Electronics is a 22 V, 400 mW DO-34 glass-sealed Zener diode with DHD (Double Heatsink Diode) construction, ±5% zener voltage tolerance at 17 mA test current, 0.2 µA maximum reverse leakage at 17 V, and 175°C maximum junction temperature - used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the RD22ES-T4-AZ datasheet, RD22ES-T4-AZ pinout, RD22ES-T4-AZ application, or RD22ES-T4-AZ equivalent, this page delivers verified electrical specs, thermal behavior, JEDEC DO-34 package details, and real-world design context for stable voltage reference and surge clamping in industrial and consumer power systems.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 22 V, specified at IZ = 17 mA and TA = 25°C. Its DHD construction enables enhanced thermal dissipation in the compact DO-34 package, supporting continuous 400 mW power handling up to 125°C ambient.
Dynamic impedance is 30 Ω max at IZ = 17 mA, and knee impedance is 0.5 Ω max at IZK = 1 mA, ensuring stable regulation across load transients. The device exhibits a positive temperature coefficient of +0.07 %/°C near 22 V, confirmed in Fig. 9 of D13935EJ7V0DS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V ±5% at IZ = 17 mA - defines precise regulation point for feedback networks |
| Power Dissipation (P) | 400 mW - maximum continuous DC power in DO-34 package with adequate PCB copper area |
| Dynamic Impedance (ZZ) | 30 Ω max at IZ = 17 mA - low AC impedance ensures minimal output voltage variation under load changes |
| Reverse Leakage (IR) | 0.2 µA max at VR = 17 V - guarantees negligible quiescent current in high-impedance bias networks |
| Junction Temperature (Tj) | 175°C max - supports operation in thermally demanding environments without derating below 125°C ambient |
| Surge Power (PRSM) | 100 W for t = 10 µs - enables transient overvoltage suppression in line-powered circuits |
| Thermal Resistance (RthJA) | 375°C/W on 7 mm² PCB - quantifies thermal path from junction to ambient for layout thermal design |
Pinout & Package
RD22ES-T4-AZ uses the standard JEDEC DO-34 axial glass package (2.4 mm max body length, 5 mm lead pitch), with cathode indicated by a black band. It has two terminals: anode and cathode - no internal circuitry or multi-pin functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; carries forward current during fault conditions |
| Cathode | Zener breakdown terminal | Marked with black band; connected to regulated voltage node; sinks current during regulation or surge events |
Key Features
| Feature | Design Value |
|---|---|
| DHD (Double Heatsink Diode) construction | Enables 400 mW dissipation in DO-34 by improving heat transfer through both leads and glass body |
| DO-34 glass-sealed package | Provides hermetic sealing and mechanical robustness for long-term reliability in humid or contaminated environments |
| E24-standard zener voltage grading | Ensures consistent 22 V selection across production lots, simplifying BOM management and calibration |
| Low knee impedance (0.5 Ω max) | Delivers stable regulation even at low bias currents (IZK = 1 mA), critical for low-power standby circuits |
| Positive VZ temperature coefficient (+0.07 %/°C) | Compensates for negative tempcos of other components (e.g., op-amps) in precision reference designs |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Regulates output voltage in flyback or buck converter feedback loop via optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Zener reference element setting precise trip threshold for TL431-type shunt regulators or discrete error amplifiers. Use Value: 22 V rating allows direct use with 24 V rail monitoring; ±5% tolerance and 30 Ω ZZ ensure <±1% output regulation accuracy under line/load variation. |
Use Scenario: Clamps transient spikes on 24 V industrial bus lines caused by inductive switching or ESD events. IC Role / Device Role / Timing Role: Passive voltage clamp absorbing surge energy before it reaches downstream ICs or connectors. Use Value: 100 W surge rating (10 µs) and 175°C Tj enable reliable protection without thermal runaway during repetitive surges. |
| Reference Voltage Generator | Waveform Clipping Circuit |
|
Use Scenario: Generates stable 22 V reference for analog-to-digital converter (ADC) input scaling or sensor excitation. IC Role / Device Role / Timing Role: Precision DC voltage source providing known bias point for signal conditioning stages. Use Value: 0.2 µA reverse leakage at 17 V minimizes loading error in high-impedance divider networks feeding op-amp inputs. |
Use Scenario: Limits peak amplitude of audio or control signals to prevent amplifier saturation or ADC overrange. IC Role / Device Role / Timing Role: Bidirectional clipping element (with series resistor) shaping signal envelope in analog front-ends. Use Value: Sharp 22 V breakdown knee and low ZZK ensure clean, repeatable clipping threshold with minimal distortion in 20 kHz bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 22 V, 1 W, DO-41 package; 25 Ω ZZ at 17 mA; 5 µA IR at 17 V | Higher power rating but larger footprint; higher leakage reduces suitability for ultra-low-power biasing | Select when >400 mW continuous dissipation is required and board space permits DO-41 mounting |
| BZX55C22 | 22 V, 500 mW, DO-35 package; 35 Ω ZZ at 5 mA; 0.1 µA IR at 17 V | Smaller DO-35 body (1.8 mm Ø); lower leakage but higher dynamic impedance and tighter thermal limits | Select when miniaturization is critical and average power remains ≤300 mW with active cooling |
Compared with RD22ES-T4-AZ, the 1N4742A offers higher power margin but requires PCB redesign for DO-41, while the BZX55C22 saves space yet demands stricter thermal management due to its smaller thermal mass and higher ZZ.
Availability
RD22ES-T4-AZ is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and consumer appliance voltage regulation requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for RD22ES-T4-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 timing solutions for automotive, industrial, and IoT applications.
The RD2.0ES–RD39ES series was designed as a family of high-reliability, glass-sealed Zener diodes targeting cost-sensitive yet thermally demanding voltage reference and protection roles in industrial and consumer equipment.
FAQ
What is the exact zener voltage tolerance and test condition for RD22ES-T4-AZ?
The RD22ES-T4-AZ has a zener voltage of 22 V with ±5% tolerance, measured at IZ = 17 mA and TA = 25°C per datasheet D13935EJ7V0DS. This tolerance applies to all suffix variants including -T4-AZ, and reflects manufacturing spread under standardized pulse-test conditions (40 ms).
Does RD22ES-T4-AZ support surge protection, and what is its rated surge capability?
Yes, RD22ES-T4-AZ is rated for non-repetitive surge reverse power of 100 W at t = 10 µs (Fig. 10, D13935EJ7V0DS). This makes it suitable for clamping inductive kickback and ESD transients in 24 V systems, provided series current limiting is applied to avoid exceeding PRSM limits.
What is the thermal resistance and how does it affect PCB layout for RD22ES-T4-AZ?
RD22ES-T4-AZ has a junction-to-ambient thermal resistance of 375°C/W on a 7 mm² PCB (Fig. 7, D13935EJ7V0DS). To sustain 400 mW continuously, minimum copper area should be ≥7 mm² per lead; doubling copper area reduces RthJA by ~30%, directly improving power handling and reliability.
How does the DHD construction of RD22ES-T4-AZ improve performance over standard DO-34 diodes?
The DHD (Double Heatsink Diode) construction in RD22ES-T4-AZ enhances thermal conduction through both axial leads and the glass body, enabling full 400 mW dissipation in the DO-34 form factor - a 25% increase over conventional DO-34 Zeners rated at 320 mW or less under identical conditions.
Is RD22ES-T4-AZ RoHS compliant and what is its quality grade?
RD22ES-T4-AZ meets EU RoHS Directive requirements as confirmed by Renesas' environmental compliance documentation. Its quality grade is "Standard", making it suitable for computers, office equipment, industrial robots, and consumer appliances - not for life-support or aerospace applications without explicit Renesas authorization.
RD22ES-T4-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:
- -
RD22ES-T4-AZ FAQ
1.How can I place an order for RD22ES-T4-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD22ES-T4-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 RD22ES-T4-AZ reliable?
The price and inventory of RD22ES-T4-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD22ES-T4-AZ is usually 5 days.
3.What payment methods are accepted for RD22ES-T4-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD22ES-T4-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD22ES-T4-AZ?
RD22ES-T4-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD22ES-T4-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 RD22ES-T4-AZ?
For technical support, including RD22ES-T4-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD22ES-T4-AZ requirements.
6.How does Aetrix verify that RD22ES-T4-AZ is sourced from the original manufacturer or authorized distributors?
All RD22ES-T4-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 RD22ES-T4-AZ meets industry standards.
7.What is the process for return or replacement of RD22ES-T4-AZ?
All RD22ES-T4-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD22ES-T4-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 RD22ES-T4-AZ part is unused and in its original packaging.
Return procedure for RD22ES-T4-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD22ES-T4-AZ Tags
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MMBZ5240B-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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