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Renesas RD3.3F-AZ
- Part No.:
- RD3.3F-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD3.3F-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
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Inventory:2,586
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Product details
Overview
RD3.3F-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed DHD package, rated for 3.13–3.51 V zener voltage at 40 mA test current, with 15 Ω dynamic impedance, −2.5 mV/°C temperature coefficient, and 80 μA max reverse leakage at 1.0 V. It serves as a precision voltage reference and overvoltage clamp in power supply feedback loops.
For engineers reviewing the RD3.3F-AZ datasheet, RD3.3F-AZ pinout, RD3.3F-AZ application, or RD3.3F-AZ equivalent, this device is selected for low-voltage stabilization in industrial control I/O modules, embedded sensor biasing circuits, and DC-DC converter error amplifiers where tight tolerance and thermal stability are required.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal 3.3 V regulation point, optimized for stable DC voltage reference under 40 mA zener test current. Its planar junction structure ensures consistent breakdown characteristics and low noise performance.
The DO-41 package provides axial lead mounting and thermal dissipation capability up to 1.0 W at 25°C ambient, with derating to zero at 175°C junction temperature. The black cathode band marking enables unambiguous polarity identification during PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.13–3.51 V at IZ = 40 mA - defines usable regulation window for 3.3 V rail monitoring |
| Dynamic Impedance (ZZ) | 15 Ω max - limits output voltage variation under load current changes |
| Reverse Leakage (IR) | 80 μA max at VR = 1.0 V - ensures minimal quiescent current in standby mode |
| Temp. Coefficient (γZ) | −2.5 mV/°C typical - enables predictable drift compensation in temperature-sensitive circuits |
| Power Dissipation (P) | 1.0 W at TA = 25°C - supports continuous operation in compact heatsink-free designs |
| Junction Temperature (Tj) | 175°C max - allows use in high-ambient industrial environments with proper layout |
| Surge Power (PRSM) | 400 W for t = 10 μs - provides transient overvoltage immunity without external TVS |
Pinout & Package
DO-41 glass-sealed axial package with cathode indicated by black band; leads are tinned copper-clad steel, suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference ground | Connected to circuit ground or lower-potential node in shunt regulator configuration |
| Cathode | Zener voltage reference output / Reverse breakdown anode | Connected to regulated node; voltage at this terminal clamps to VZ when reverse biased |
Key Features
| Feature | Design Value |
|---|---|
| E24-series voltage grading | Enables standardization across 3.3 V design variants without custom binning |
| Planar junction construction | Delivers repeatable breakdown voltage and low parameter spread across production lots |
| DHD (Double Heatsink Diode) structure | Improves thermal resistance path for reliable 1 W operation in confined layouts |
| −65 to +175°C storage range | Supports reflow, conformal coating, and long-term storage in harsh manufacturing environments |
| JEDEC DO-41 compliance | Ensures mechanical compatibility with automated insertion equipment and legacy footprints |
Applications
| Industrial Sensor Biasing | DC-DC Converter Feedback |
|---|---|
Use Scenario: Providing stable 3.3 V reference for analog front-end amplifiers in temperature, pressure, and current sensors. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise bias point for op-amp input stages. Use Value: Maintains sensor accuracy within ±1% over −40 to +85°C due to low γZ and tight VZ tolerance. |
Use Scenario: Setting output voltage in isolated flyback or buck converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener clamp on TL431 reference input or direct feedback node for PWM controller. Use Value: Enables ±2% output regulation without trimming resistors, reducing BOM count and calibration steps. |
| Microcontroller Reset Circuit | Surge Protection Clamp |
Use Scenario: Generating clean reset signal for 3.3 V MCUs during power-up and brownout conditions. IC Role / Device Role / Timing Role: Voltage threshold detector combined with RC timing network for reset pulse generation. Use Value: Guarantees valid reset assertion down to 2.7 V supply while rejecting noise spikes below 3.13 V. |
Use Scenario: Protecting I/O pins of PLC modules and industrial HMI interfaces from ESD and inductive switching transients. IC Role / Device Role / Timing Role: Fast-acting shunt limiter absorbing surge energy before downstream ICs reach failure thresholds. Use Value: Withstands 400 W surges (10 μs) without degradation, eliminating need for secondary TVS in cost-sensitive designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | Same 3.3 V nominal, but 1.3 W rating, higher ZZ (10 Ω min), wider VZ tolerance (±5%) | Less precise regulation in low-current feedback paths; better suited for bulk clamping | Choose when higher surge margin is needed and tighter VZ tolerance is not critical |
| BZX55-C3V3 | 3.3 V nominal, 500 mW rating, 95 Ω ZZ, −2 mV/°C γZ, DO-35 package | Lower power handling limits use in >100 mA regulator loops; smaller footprint reduces board area | Choose for space-constrained consumer designs where 0.5 W dissipation suffices |
Compared with RD3.3F-AZ, 1N4728A offers higher surge robustness but looser regulation, while BZX55-C3V3 saves board space at the cost of thermal headroom and dynamic impedance - RD3.3F-AZ balances precision, power, and manufacturability for industrial-grade 3.3 V references.
Availability
RD3.3F-AZ is available at Aetrix Electronics and suitable for industrial sensor biasing, DC-DC converter feedback, and microcontroller reset circuits requiring stable component supply across multi-year production cycles.
Supply support for RD3.3F-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 specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
RD3.3F-AZ belongs to the RD2.0F–RD82F planar Zener diode family designed for standardized voltage reference and surge suppression in cost-sensitive, high-reliability industrial power systems.
FAQ
What is the zener voltage tolerance of RD3.3F-AZ at 40 mA test current?
The RD3.3F-AZ has a guaranteed zener voltage range of 3.13 V to 3.51 V when tested at 40 mA, corresponding to a ±6.3% tolerance around the nominal 3.3 V value. This specification is verified per the Renesas D13936EJ5V0DS datasheet, and applies only under the stated test condition of 40 ms pulse duration after power-on.
Can RD3.3F-AZ be used in surface-mount designs?
No, RD3.3F-AZ uses a through-hole DO-41 axial package and is not compatible with SMT assembly processes. For surface-mount equivalents, consider Renesas' MMSZ3V3 or similar SOD-123 packaged Zeners - RD3.3F-AZ requires wave or hand soldering with axial lead spacing of 25 mm minimum.
What is the maximum allowable reverse voltage before breakdown for RD3.3F-AZ?
The RD3.3F-AZ begins controlled reverse breakdown at its specified zener voltage (3.13–3.51 V). Below 1.0 V reverse bias, leakage remains ≤80 μA; operation above 3.51 V is normal regulation behavior, not damage threshold. Permanent failure occurs only if power dissipation exceeds 1.0 W or junction temperature exceeds 175°C.
How does the temperature coefficient affect RD3.3F-AZ in a 0–70°C operating range?
With a typical γZ of −2.5 mV/°C, RD3.3F-AZ's zener voltage drifts approximately −175 mV across a 70°C span - from ~3.475 V at 0°C to ~3.300 V at 70°C. This predictable negative drift must be accounted for in precision reference designs; the datasheet provides γZ curves for exact interpolation.
Is RD3.3F-AZ compliant with RoHS and REACH requirements?
Yes, RD3.3F-AZ meets EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, as confirmed by Renesas Electronics' environmental compliance documentation. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and uses halogen-free molding compound.
RD3.3F-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:
- -
RD3.3F-AZ FAQ
1.How can I place an order for RD3.3F-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD3.3F-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 RD3.3F-AZ reliable?
The price and inventory of RD3.3F-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD3.3F-AZ is usually 5 days.
3.What payment methods are accepted for RD3.3F-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD3.3F-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD3.3F-AZ?
RD3.3F-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD3.3F-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 RD3.3F-AZ?
For technical support, including RD3.3F-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD3.3F-AZ requirements.
6.How does Aetrix verify that RD3.3F-AZ is sourced from the original manufacturer or authorized distributors?
All RD3.3F-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 RD3.3F-AZ meets industry standards.
7.What is the process for return or replacement of RD3.3F-AZ?
All RD3.3F-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD3.3F-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 RD3.3F-AZ part is unused and in its original packaging.
Return procedure for RD3.3F-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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