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Renesas RD33F-T8-AZ
- Part No.:
- RD33F-T8-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD33F-T8-AZ.pdf
- Description:
- DIODE ZENER
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Product details
Overview
RD33F-T8-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode with a nominal zener voltage of 33 V (B3 grade: 32.39–34.15 V), dynamic impedance of 10 Ω at 10 mA, and maximum reverse current of 10 μA at 25 V. It features a DO-41 glass-sealed DHD package, −65 to +175 °C storage temperature range, and is rated for surge reverse power of 400 W (t = 10 μs). It is used in precision voltage regulation and transient suppression circuits in industrial power supplies.
For engineers reviewing the RD33F-T8-AZ datasheet, RD33F-T8-AZ pinout, RD33F-T8-AZ application, or RD33F-T8-AZ equivalent, key selection criteria include zener voltage tolerance (±2.7% B3 grade), thermal resistance (150 °C/W typical), junction temperature limit (175 °C), and compliance with JEDEC DO-41 mechanical standards.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar construction ensures consistent voltage regulation and low dynamic impedance across the 33 V nominal point, with a zener voltage temperature coefficient of +25 mV/°C (typical) indicating positive drift above 5 V.
The device uses a Double Heatsink Diode (DHD) structure for enhanced thermal dissipation in compact through-hole mounting. It supports constant-current biasing at 10 mA and meets standard industrial reliability requirements without radiation hardening or automotive-grade qualification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 32.39–34.15 V (B3 grade, tested at 10 mA; ±2.7% tolerance) |
| Power Dissipation (P) | 1.0 W at TA = 25 °C; derates linearly above 25 °C per Figure 1 |
| Dynamic Impedance (ZZ) | 10 Ω max at IZ = 10 mA; ensures tight regulation under small-signal AC superposition |
| Reverse Current (IR) | ≤10 μA at VR = 25 V; confirms low leakage in standby/clamping states |
| Junction Temperature (Tj) | 175 °C max; defines absolute thermal limit for safe continuous operation |
| Surge Reverse Power (PRSM) | 400 W for t = 10 μs (non-repetitive); enables transient overvoltage absorption |
| Package | DO-41 (JEDEC); axial leaded, glass-sealed, 3.0 mm diameter × 25 mm length |
Pinout & Package
RD33F-T8-AZ is a two-terminal axial-leaded Zener diode in JEDEC DO-41 package. Cathode is marked by black band on glass body. No internal circuitry or multi-pin configuration - terminals are anode (unmarked end) and cathode (banded end).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or lower potential in shunt regulator configurations |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 33 V reference when reverse-biased above VZ; marked with black band |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage range coverage | Part of RD2.0F–RD82F family spanning 2–82 V; enables standardized BOM across multiple voltage rails |
| E24 series nominal values | 33 V aligns with IEC 60063 E24 preferred number series; simplifies inventory and design reuse |
| Planar-type glass-sealed DHD structure | Ensures repeatable breakdown characteristics and long-term stability under thermal cycling |
| Low dynamic impedance at 10 mA | 10 Ω max enables <1% output variation under ±10 mA load step in shunt regulators |
| High surge power capability | 400 W peak (10 μs) supports IEC 61000-4-5 level 4 surge immunity in industrial interfaces |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing 33 V reference in isolated DC-DC converter feedback loops for PLC power modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise feedback to optocoupler-driven PWM controller. Use Value: Maintains ±1% output accuracy over −40 to +85 °C ambient due to predictable +25 mV/°C tempco and low ZZ. | Use Scenario: Clamping induced transients on 24 V control bus in factory automation I/O cards. IC Role / Device Role / Timing Role: Fast-acting crowbar element absorbing 400 W surges (10 μs) without failure. Use Value: Prevents downstream MCU reset or latch-up during lightning-induced line spikes per IEC 61000-4-5. |
| Waveform Clipping in Signal Conditioning | Constant-Current Bias Source |
Use Scenario: Limiting analog sensor signal swing to ±33 V before ADC input in vibration monitoring systems. IC Role / Device Role / Timing Role: Bidirectional clipping diode pair (with series resistor) defining hard rail limits. Use Value: Achieves sub-10 ns response with ≤10 Ω dynamic impedance, preserving signal integrity up to 1 MHz. | Use Scenario: Generating stable 10 mA bias current for photodiode amplifiers in optical encoders. IC Role / Device Role / Timing Role: Constant-current sink using RD33F-T8-AZ in series with ballast resistor. Use Value: Delivers ±3% current stability over temperature via matched VZ and resistor TC tracking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4747A | 33 V nominal, ±5% tolerance (wider than RD33F-T8-AZ B3 grade), 7 Ω ZZ, DO-41 package | Higher leakage (50 μA @ 25 V vs. 10 μA), no B3-grade tight tolerance option | Preferred where cost sensitivity outweighs precision; not suitable for high-stability references |
| BZX85C33 | 33 V nominal, ±5% tolerance, 300 mW rating (vs. 1 W), DO-41 package | Lower power handling limits use in >300 mW clamping or regulation; higher ZZ (35 Ω) | Acceptable only in low-power signal-level clamping; insufficient for 1 W continuous dissipation |
Compared with 1N4747A and BZX85C33, RD33F-T8-AZ offers tighter voltage tolerance (±2.7%), lower leakage, and full 1 W continuous rating - making it the sole choice for industrial-grade 33 V shunt regulation requiring long-term stability and surge resilience.
Availability
RD33F-T8-AZ is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, waveform clipping designs, and constant-current bias sources requiring stable component supply with traceable sourcing and lifecycle continuity.
Supply support for RD33F-T8-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 Japanese semiconductor manufacturer formed in 2010 via merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and discrete power devices.
RD33F-T8-AZ belongs to the RD2.0F–RD82F planar Zener diode product line, designed specifically for industrial-grade voltage regulation, clamping, and reference applications demanding 1 W power handling and DO-41 reliability.
FAQ
What is the exact zener voltage tolerance for RD33F-T8-AZ?
The RD33F-T8-AZ is specified in the B3 voltage classification, with a minimum zener voltage of 32.39 V and maximum of 34.15 V at 10 mA test current - representing a ±2.7% tolerance around the nominal 33 V. This tight tolerance is confirmed in Renesas' D13936EJ5V0DS datasheet, Table on page 4, and applies specifically to RD33F-T8-AZ, not the broader RD33F family.
Does RD33F-T8-AZ have automotive qualification?
No, RD33F-T8-AZ is classified as a "Standard" quality grade device per Renesas documentation, intended for computers, office equipment, industrial robots, and communications gear - not automotive or safety-critical systems. It lacks AEC-Q101 stress testing, and its datasheet does not list automotive temperature range (−40 to +125 °C) or PPAP support.
What is the thermal resistance (RthJA) of RD33F-T8-AZ in free air?
Renesas does not specify a single RthJA value for RD33F-T8-AZ, but Figure 2 in the datasheet shows thermal resistance versus PCB copper area. At zero copper (free-air mounting), Rth is approximately 150 °C/W - consistent with typical DO-41 devices. Derating must follow Figure 1: power drops linearly from 1.0 W at 25 °C to 0 W at ~175 °C ambient.
Can RD33F-T8-AZ replace RD33F without changes?
Yes - RD33F-T8-AZ is a direct variant of RD33F, sharing identical electrical specs, DO-41 package, and B3 voltage grade. The "-T8-AZ" suffix denotes tape-and-reel packaging and RoHS-compliant plating (per Renesas' suffix coding convention), with no functional or parametric difference from bulk RD33F-B3 parts.
Is RD33F-T8-AZ suitable for surge protection per IEC 61000-4-5?
Yes - RD33F-T8-AZ supports non-repetitive surge reverse power of 400 W at 10 μs (Figure 7), meeting Level 4 (4 kV) combination wave requirements when properly mounted with low-inductance layout and series impedance. Its 175 °C junction limit and DO-41 thermal mass enable reliable single-event clamping without thermal runaway.
RD33F-T8-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:
- -
RD33F-T8-AZ FAQ
1.How can I place an order for RD33F-T8-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD33F-T8-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 RD33F-T8-AZ reliable?
The price and inventory of RD33F-T8-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD33F-T8-AZ is usually 5 days.
3.What payment methods are accepted for RD33F-T8-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD33F-T8-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD33F-T8-AZ?
RD33F-T8-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD33F-T8-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 RD33F-T8-AZ?
For technical support, including RD33F-T8-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD33F-T8-AZ requirements.
6.How does Aetrix verify that RD33F-T8-AZ is sourced from the original manufacturer or authorized distributors?
All RD33F-T8-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 RD33F-T8-AZ meets industry standards.
7.What is the process for return or replacement of RD33F-T8-AZ?
All RD33F-T8-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD33F-T8-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 RD33F-T8-AZ part is unused and in its original packaging.
Return procedure for RD33F-T8-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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