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Renesas RD22JS-T1-AZ
- Part No.:
- RD22JS-T1-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD22JS-T1-AZ.pdf
- Description:
- DIODE ZENER
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Product details
Overview
RD22JS-T1-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 5 mA test current, 17 Ω dynamic impedance, and 0.2 µA reverse leakage at 17 V, used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the RD22JS-T1-AZ datasheet, RD22JS-T1-AZ pinout, RD22JS-T1-AZ application, or RD22JS-T1-AZ equivalent, this page delivers verified electrical specs, thermal performance data, JEDEC DO-34 package details, and real-world design guidance for voltage reference and surge suppression use cases.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 22 V at IZ = 5 mA, exhibiting a temperature coefficient of +0.055 %/°C (≈+12.1 mV/°C), enabling stable regulation across industrial temperature ranges. Its DHD construction improves thermal dissipation by providing dual heat paths through both leads.
The device supports surge reverse power up to 100 W for 10 µs pulses and maintains junction temperature ≤175°C under continuous 400 mW dissipation at TA = 25°C. Its DO-34 package features axial leads, black cathode band marking, and 2.4 mm maximum body length per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V ±5% at IZ = 5 mA - defines precise clamping threshold for voltage reference and overvoltage protection |
| Power Dissipation (P) | 400 mW - maximum continuous DC power handling at TA = 25°C without derating |
| Dynamic Impedance (ZZ) | 17 Ω at IZ = 5 mA - low AC impedance ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 0.2 µA at VR = 17 V - ultra-low leakage preserves accuracy in high-impedance bias networks |
| Surge Power (PRSM) | 100 W for t = 10 µs - enables robust transient suppression against ESD and inductive switching spikes |
| Junction Temperature (Tj) | 175°C - allows operation in high-ambient environments such as enclosed power supplies and motor drives |
| Package | DO-34 (JEDEC) - axial-leaded glass package with 5 mm lead pitch, compatible with wave soldering and manual insertion |
Pinout & Package
RD22JS-T1-AZ uses a standard two-terminal DO-34 glass package with axial leads. Cathode is marked by a black band on the body. No internal pin numbering applies-only anode and cathode terminals exist.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit ground or lower-potential rail; forms reference return path in shunt regulator topologies |
| Cathode | Reverse breakdown terminal / Zener output node | Connected to regulated voltage node; provides stable 22 V reference when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| DHD (Double Heatsink Diode) construction | Dual thermal paths via both axial leads reduce junction-to-ambient thermal resistance, improving reliability under sustained power stress |
| Planar process technology | Enables tight VZ tolerance (±5%) and repeatable dynamic impedance across production lots |
| DO-34 glass-sealed package | Hermetic sealing ensures long-term stability and moisture resistance; 2.4 mm max body length supports compact PCB layouts |
| E24-standard zener voltage | 22 V value aligns with IEC 60063 E24 series, simplifying BOM consolidation and cross-referencing with other Zener families |
| Low knee impedance (ZZK) | 17 Ω at 5 mA ensures sharp turn-on and minimal voltage droop during light-load regulation |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Provides reference voltage for TL431-based optocoupler feedback in 24 V offline AC/DC adapters. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise 22 V threshold for error amplifier comparison. Use Value: Maintains ±1% output regulation over line/load/temperature due to low ZZ and stable γZ. |
Use Scenario: Clamps analog sensor output (e.g., 4–20 mA transmitter) to prevent ADC input overvoltage. IC Role / Device Role / Timing Role: Passive overvoltage protector limiting signal rail to 22 V before op-amp buffer stage. Use Value: Survives 100 W surge pulses without degradation, eliminating need for active crowbar circuits. |
| Programmable Logic Controller I/O Protection | Automotive Body Control Module Reference |
Use Scenario: Shields digital input pins from induced transients on 24 V CAN bus-connected field wiring. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp absorbing fast-rising ESD and inductive kickback. Use Value: Responds within nanoseconds with <0.2 µA leakage, preserving signal integrity during normal operation. |
Use Scenario: Supplies stable 22 V reference for microcontroller reset supervisor ICs in 12 V battery systems. IC Role / Device Role / Timing Role: Precision voltage source for POR (power-on reset) threshold detection. Use Value: Temperature coefficient of +0.055 %/°C ensures consistent reset point across –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 |
|---|---|---|---|
| 1N4745A | 22 V ±5%, 1 W rating, DO-41 package, 23 Ω ZZ, 100 °C/W RθJA | Higher power rating but larger footprint; less suitable for space-constrained PCBs | Select when >400 mW continuous dissipation is required and board area permits DO-41 |
| BZX55C22 | 22 V ±5%, 500 mW rating, DO-35 package, 25 Ω ZZ, black cathode band, RoHS-compliant | Slightly higher ZZ and different thermal profile; not DHD-constructed | Prefer for new designs requiring RoHS compliance and where 25 Ω ZZ meets regulation spec |
Compared with RD22JS-T1-AZ, the 1N4745A offers higher power headroom but requires more PCB area, while the BZX55C22 provides RoHS alignment and similar voltage accuracy at the cost of reduced thermal efficiency and higher dynamic impedance.
Availability
RD22JS-T1-AZ is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and automotive body electronics requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for RD22JS-T1-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 IoT applications.
The RD22JS-T1-AZ belongs to the legacy NEC RD-series Zener diodes, engineered for high-stability voltage reference and surge protection in industrial-grade power management systems.
FAQ
What is the zener voltage tolerance and test condition for RD22JS-T1-AZ?
The RD22JS-T1-AZ has a zener voltage tolerance of ±5% at a test current of 5 mA, as specified in the D13935EJ7V0DS datasheet. This tolerance ensures predictable clamping behavior in voltage reference and overvoltage protection circuits where tight regulation is required.
Does RD22JS-T1-AZ support surge protection, and what is its peak pulse rating?
Yes, RD22JS-T1-AZ supports non-repetitive surge suppression with a peak reverse power rating of 100 W for 10 µs pulses, per Figure 10 in the official datasheet. This makes it suitable for absorbing ESD events and inductive switching transients in industrial control inputs.
What is the thermal resistance and maximum junction temperature of RD22JS-T1-AZ?
RD22JS-T1-AZ has a junction-to-ambient thermal resistance of approximately 375°C/W (per Fig. 11 transient curve) and a maximum junction temperature of 175°C. These values define safe operating limits under continuous 400 mW dissipation at 25°C ambient.
Is RD22JS-T1-AZ RoHS compliant, and what is its packaging format?
RD22JS-T1-AZ is supplied in tape-and-reel format (T1 suffix) and was manufactured prior to full RoHS enforcement. It contains leaded glass encapsulation per legacy NEC specifications; for RoHS-compliant alternatives, consider BZX55C22 or MMBZ5245B.
How does the DHD construction improve thermal performance of RD22JS-T1-AZ?
The DHD (Double Heatsink Diode) construction in RD22JS-T1-AZ provides two parallel thermal conduction paths through both axial leads, lowering effective thermal resistance versus conventional single-path Zeners. This enhances reliability under sustained power stress in compact power supply designs.
RD22JS-T1-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:
- -
RD22JS-T1-AZ FAQ
1.How can I place an order for RD22JS-T1-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD22JS-T1-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 RD22JS-T1-AZ reliable?
The price and inventory of RD22JS-T1-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD22JS-T1-AZ is usually 5 days.
3.What payment methods are accepted for RD22JS-T1-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD22JS-T1-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD22JS-T1-AZ?
RD22JS-T1-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD22JS-T1-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 RD22JS-T1-AZ?
For technical support, including RD22JS-T1-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD22JS-T1-AZ requirements.
6.How does Aetrix verify that RD22JS-T1-AZ is sourced from the original manufacturer or authorized distributors?
All RD22JS-T1-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 RD22JS-T1-AZ meets industry standards.
7.What is the process for return or replacement of RD22JS-T1-AZ?
All RD22JS-T1-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD22JS-T1-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 RD22JS-T1-AZ part is unused and in its original packaging.
Return procedure for RD22JS-T1-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD22JS-T1-AZ Tags
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