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Renesas RD33F-T7-AZ
- Part No.:
- RD33F-T7-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD33F-T7-AZ.pdf
- Description:
- DIODE ZENER
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Inventory:572,005
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Product details
Overview
RD33F-T7-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed DHD package, with nominal zener voltage 33 V (B3 grade: 32.39–34.15 V), dynamic impedance ≤18 Ω at 10 mA, and temperature coefficient +25 mV/°C, used for precision voltage regulation and surge absorption in industrial power supplies.
For engineers reviewing the RD33F-T7-AZ datasheet, RD33F-T7-AZ pinout, RD33F-T7-AZ application, or RD33F-T7-AZ equivalent, this page delivers verified electrical specs, thermal behavior, JEDEC DO-41 terminal mapping, and two validated alternative Zeners for voltage reference and transient protection design-in.
Technical Context
This device operates as a two-terminal voltage reference with sharp reverse breakdown at 33 V under 10 mA test current. Its planar junction structure ensures stable zener voltage tolerance and low dynamic impedance across ambient temperatures from −65°C to +175°C.
The RD33F-T7-AZ exhibits a positive zener voltage temperature coefficient of +25 mV/°C (typical), enabling predictable drift compensation in temperature-sensitive circuits. It supports single-pulse surge reverse power up to 400 W (t = 10 μs) and maintains 1 W steady-state dissipation with appropriate heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 32.39–34.15 V at IZ = 10 mA - defines regulated output range for reference or clamping |
| Dynamic Impedance (ZZ) | ≤18 Ω at IZ = 10 mA - ensures minimal voltage variation under load current changes |
| Power Dissipation (P) | 1.0 W at TA = 25°C - sets maximum continuous DC power handling without heatsink |
| Zener Temp. Coefficient (γZ) | +25 mV/°C (typical) - quantifies voltage drift per degree Celsius rise in junction temperature |
| Surge Reverse Power (PRSM) | 400 W for t = 10 μs - enables robust transient suppression of short-duration voltage spikes |
| Junction Temperature (Tj) | 175°C maximum - determines upper thermal limit for reliable long-term operation |
| Reverse Current (IR) | ≤10 μA at VR = 25 V - confirms low leakage below breakdown, critical for standby power integrity |
Pinout & Package
RD33F-T7-AZ uses the JEDEC DO-41 axial glass package (3.0 mm diameter × 5.0 mm max length), with cathode indicated by black band. The device has two terminals: anode and cathode - no internal circuitry or control pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-biased regulation; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher potential side during voltage regulation or clamping |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage range (2–82 V) | Enables standardized BOM coverage across multiple voltage rails in industrial power designs |
| E24 series nominal values | Supports precise selection within 5% increments, simplifying reference voltage matching |
| Planar-type DHD structure | Delivers improved thermal stability and repeatable breakdown characteristics vs. alloy-junction diodes |
| DO-41 glass package | Provides mechanical robustness, hermetic sealing, and compatibility with automated through-hole assembly |
| Positive temperature coefficient (+25 mV/°C) | Allows predictable voltage drift modeling for temperature-compensated regulator topologies |
Applications
| Voltage Reference Circuit | Surge Absorption Circuit |
|---|---|
Use Scenario: Stable 33 V reference for analog-to-digital converter biasing and sensor excitation in PLC I/O modules. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing fixed reverse-bias potential. Use Value: Maintains ±1.36 V regulation window (32.39–34.15 V) with <18 Ω dynamic impedance, minimizing ADC offset error due to supply drift. |
Use Scenario: Protection of 24 V DC input stage against ESD and inductive switching transients in motor drive controllers. IC Role / Device Role / Timing Role: Clamping element that conducts above 33 V to shunt surge energy to ground. Use Value: Withstands 400 W single-pulse surges (10 μs), limiting transient overvoltage to safe levels for downstream MOSFET gate drivers. |
| Waveform Clipper Circuit | Constant-Current Source |
Use Scenario: Audio signal limiting in industrial communication interface receivers to prevent amplifier saturation. IC Role / Device Role / Timing Role: Bidirectional clipping diode pair (with series resistor) defining symmetrical peak amplitude. Use Value: Sharp 33 V breakdown enables clean hard-clipping at known threshold, preserving signal fidelity below clipping level. |
Use Scenario: LED current regulation in status indicator circuits for HMI panels operating from unregulated 36 V supply. IC Role / Device Role / Timing Role: Series-pass element in simple constant-current sink configuration. Use Value: Delivers stable 10 mA LED current with <1% variation over temperature, leveraging low ZZ and predictable γZ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 33 V nominal, ±5% tolerance (31.35–34.65 V), ZZ ≤25 Ω at 33 mA, DO-41 package | Higher test current (33 mA vs. 10 mA) shifts operating point; wider voltage spread reduces precision | Acceptable where tighter voltage tolerance is not required and higher power derating is acceptable |
| BZX85C33 | 33 V nominal, ±5% tolerance (31.4–34.6 V), ZZ ≤35 Ω at 5 mA, DO-41 package | Lower test current (5 mA) yields higher effective ZZ; less stable under varying load conditions | Suitable for cost-sensitive consumer-grade clamping where dynamic impedance is secondary |
Compared with RD33F-T7-AZ, 1N4742A offers higher test current but looser voltage tolerance, while BZX85C33 uses lower test current and exhibits higher dynamic impedance - making RD33F-T7-AZ preferable for precision regulation and low-drift industrial references.
Availability
RD33F-T7-AZ is available at Aetrix Electronics and suitable for industrial power supplies, motor control interfaces, and sensor signal conditioning requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for RD33F-T7-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 industrial, automotive, and infrastructure markets.
RD33F-T7-AZ belongs to the RD2.0F–RD82F planar zener diode family, engineered for high-reliability voltage regulation and transient suppression in standard-grade industrial equipment.
FAQ
What is the exact zener voltage range for RD33F-T7-AZ at 10 mA?
The RD33F-T7-AZ has a guaranteed zener voltage range of 32.39 V to 34.15 V when tested at IZ = 10 mA and TA = 25°C, corresponding to its B3 grade classification per Renesas datasheet D13936EJ5V0DS. This 1.76 V window reflects tight process control for industrial reference applications. RD33F-T7-AZ maintains this specification across its qualified operating temperature range.
Does RD33F-T7-AZ have a specified junction-to-ambient thermal resistance?
No, RD33F-T7-AZ does not specify a fixed RθJA value because thermal performance depends on PCB copper area and mounting conditions. Renesas provides thermal resistance curves (Rθ vs. S) showing 200°C/W at S = 5 mm², 120°C/W at S = 10 mm², and 80°C/W at S = 20 mm². RD33F-T7-AZ requires external heatsinking for sustained 1 W operation above 25°C ambient.
Is RD33F-T7-AZ RoHS compliant?
Yes, RD33F-T7-AZ complies with the EU RoHS Directive, as confirmed by Renesas Electronics' environmental compliance documentation. The device contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE) above threshold limits. RD33F-T7-AZ is suitable for environmentally regulated industrial manufacturing.
Can RD33F-T7-AZ be used in place of RD33F without the -T7-AZ suffix?
No - RD33F-T7-AZ is a specific ordering variant with defined packaging (tape-and-reel), marking (T7-AZ), and quality screening. While electrically identical to base RD33F, the -T7-AZ suffix indicates traceable lot control and Renesas' standard industrial reliability screening. RD33F-T7-AZ must be specified as-is for consistent supply chain and qualification requirements.
What is the maximum reverse leakage current for RD33F-T7-AZ at 25 V?
The maximum reverse leakage current (IR) for RD33F-T7-AZ is 10 μA when measured at VR = 25 V and TA = 25°C, per the official Renesas datasheet. This low leakage ensures minimal quiescent current draw in always-on monitoring circuits. RD33F-T7-AZ maintains this spec across its storage temperature range of −65°C to +175°C.
RD33F-T7-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-T7-AZ FAQ
1.How can I place an order for RD33F-T7-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD33F-T7-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-T7-AZ reliable?
The price and inventory of RD33F-T7-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-T7-AZ is usually 5 days.
3.What payment methods are accepted for RD33F-T7-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD33F-T7-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD33F-T7-AZ?
RD33F-T7-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD33F-T7-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-T7-AZ?
For technical support, including RD33F-T7-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD33F-T7-AZ requirements.
6.How does Aetrix verify that RD33F-T7-AZ is sourced from the original manufacturer or authorized distributors?
All RD33F-T7-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-T7-AZ meets industry standards.
7.What is the process for return or replacement of RD33F-T7-AZ?
All RD33F-T7-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD33F-T7-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-T7-AZ part is unused and in its original packaging.
Return procedure for RD33F-T7-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD33F-T7-AZ Tags
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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