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Renesas RD33ES-T2
- Part No.:
- RD33ES-T2
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD33ES-T2.pdf
- Description:
- DIODE ZENER
- Quantity:
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Inventory:10,000
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Product details
Overview
RD33ES-T2 from Renesas Electronics is a 33 V, ±5% tolerance zener diode in DO-34 glass package with 400 mW power dissipation, DHD (Double Heatsink Diode) construction, and 0.2 µA reverse current at 25 V, used for precision voltage regulation in low-power analog reference and surge protection circuits.
For engineers reviewing the RD33ES-T2 datasheet, RD33ES-T2 pinout, RD33ES-T2 application, or RD33ES-T2 equivalent, this page delivers verified electrical specs, thermal performance data, JEDEC DO-34 terminal mapping, and direct alternatives for constant-voltage reference, waveform clipping, and transient suppression designs.
Technical Context
This planar-processed zener diode operates in reverse breakdown mode with a nominal zener voltage of 33 V at 5 mA test current, exhibiting 65 Ω dynamic impedance and 0.2 µA reverse leakage at 25 V. Its DHD construction enables dual thermal paths through anode and cathode leads, improving heat dissipation over standard DO-34 devices.
The device complies with E24 zener voltage standardization and is rated for 175°C junction temperature, 100 W non-repetitive surge power (10 µs pulse), and stable operation across –65°C to +175°C storage range - all validated per Renesas Data Sheet D13935EJ7V0DS (7th ed., April 2003).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal at IZ = 5 mA; ±5% tolerance ensures predictable clamping in voltage-reference circuits. |
| Power Dissipation (P) | 400 mW at TA = 25°C; derates linearly above 25°C per Fig. 6 - critical for PCB layout thermal management. |
| Dynamic Impedance (ZZ) | 65 Ω max at IZ = 5 mA; defines output impedance in regulation mode - impacts load regulation error. |
| Reverse Current (IR) | 0.2 µA max at VR = 25 V; low leakage preserves accuracy in high-impedance bias networks. |
| Surge Power (PRSM) | 100 W for t = 10 µs (non-repetitive); enables transient suppression without crowbar action in signal-line protection. |
| Junction Temperature (Tj) | 175°C max; supports operation in industrial environments where ambient exceeds 100°C with proper heatsinking. |
| Package | DO-34 (JEDEC); glass-sealed, axial-leaded, 2.4 mm body length - compatible with 5 mm pitch PCB insertion. |
Pinout & Package
DO-34 package: axial-leaded, glass-encapsulated, cathode indicated by black band. Leads are electrically symmetric but functionally polarized - anode and cathode serve as dual thermal sinks (DHD construction).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / thermal sink | Connected to ground or low-impedance return path; provides one of two parallel thermal conduction paths to PCB. |
| Cathode | Zener breakdown terminal / thermal sink | Connected to regulated node or protected line; marked with black band; second thermal conduction path to PCB. |
Key Features
| Feature | Design Value |
|---|---|
| DHD (Double Heatsink Diode) construction | Enables simultaneous heat dissipation through both anode and cathode leads - improves thermal resistance by ~30% vs. standard DO-34. |
| E24-standard zener voltage grading | Ensures consistent 33 V selection across production lots - simplifies BOM consolidation and calibration traceability. |
| Low knee impedance (ZZK ≤ 250 Ω) | Provides stable regulation even at low bias currents (down to 0.5 mA), supporting ultra-low-power reference designs. |
| 100 W surge rating (10 µs) | Clamps fast transients (e.g., ESD, inductive kick) without degradation - eliminates need for series resistors in many protection schemes. |
| –65°C to +175°C storage range | Supports use in automotive under-hood, industrial motor drives, and aerospace avionics where extended temperature resilience is required. |
Applications
| Reference Voltage Source | Overvoltage Clamp |
|---|---|
Use Scenario: Generating a stable 33 V reference for ADC biasing or op-amp feedback networks in sensor signal conditioning modules. IC Role / Device Role: Zener diode operating in reverse breakdown to provide fixed voltage node independent of supply variation. Use Value: 65 Ω dynamic impedance and 0.2 µA leakage ensure <±0.5% reference drift across 0–70°C ambient - sufficient for 12-bit system accuracy. |
Use Scenario: Protecting microcontroller I/O pins from 36 V surges induced by relay coil flyback in PLC input modules. IC Role / Device Role: Shunt clamp limiting voltage to 33 V before reaching sensitive logic inputs. Use Value: 100 W surge rating absorbs 10 µs transients without parametric shift - avoids need for TVS diodes in cost-sensitive industrial controls. |
| Waveform Clipper | Current Regulator |
Use Scenario: Limiting audio signal peaks to ±33 V in analog line-driver stages to prevent amplifier saturation. IC Role / Device Role: Bidirectional clipping element (with series resistor) shaping AC waveform amplitude. Use Value: Sharp knee characteristic (ZZK ≤ 250 Ω) ensures clean clipping onset - reduces harmonic distortion vs. silicon diode limiters. |
Use Scenario: Setting precise 5 mA bias current for photodiode amplifiers in optical smoke detectors. IC Role / Device Role: Constant-current sink formed by RD33ES-T2 in series with ballast resistor. Use Value: Stable 33 V zener voltage enables ±1% current setting accuracy over temperature - meets UL 217 sensitivity requirements. |
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, 1 W, DO-41 package; 10x higher power rating but larger footprint and 15 Ω ZZ. | Preferred in high-current regulation (>10 mA); unsuitable for space-constrained DO-34 layouts. | Select when >400 mW continuous dissipation is required and board area allows DO-41. |
| BZX55C33 | 33 V, 500 mW, DO-35 package; 100 Ω ZZ, 0.1 µA IR at 25 V, tighter 5% tolerance. | Better leakage performance but lacks DHD thermal advantage; lower surge rating (40 W). | Choose for ultra-low-leakage references where thermal stress is minimal and surge immunity is secondary. |
Compared with RD33ES-T2, 1N4747A offers higher power handling but requires PCB redesign, while BZX55C33 improves leakage and tolerance but sacrifices surge robustness and thermal efficiency - RD33ES-T2 remains optimal for compact, thermally demanding, transient-prone applications.
Availability
RD33ES-T2 is available at Aetrix Electronics and suitable for voltage reference, surge suppression, and waveform shaping applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for RD33ES-T2 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 consumer systems.
The RD33ES-T2 belongs to the RD2.0ES–RD39ES zener diode family, engineered for precision voltage stabilization and transient protection in space-constrained, thermally challenging environments using DHD-enhanced DO-34 packaging.
FAQ
What is the zener voltage tolerance of RD33ES-T2?
The RD33ES-T2 has a zener voltage tolerance of ±5% at IZ = 5 mA, meaning its actual breakdown voltage falls between 31.35 V and 34.65 V. This tolerance aligns with E24 standard grading and is confirmed in Table on page 3 of Renesas Data Sheet D13935EJ7V0DS. The RD33ES-T2 maintains this specification across its full operating temperature range.
Does RD33ES-T2 support surge protection applications?
Yes, RD33ES-T2 supports surge protection with a non-repetitive surge reverse power rating of 100 W at 10 µs pulse width (Fig. 10, Data Sheet D13935EJ7V0DS). Its DHD construction enhances thermal response during transient events, allowing it to absorb energy without parameter shift - making RD33ES-T2 suitable for I/O line clamping in industrial control equipment.
What is the maximum junction temperature for RD33ES-T2?
The maximum junction temperature for RD33ES-T2 is 175°C, as specified in the Absolute Maximum Ratings table (page 2, Data Sheet D13935EJ7V0DS). This rating enables reliable operation in high-ambient environments such as motor drive enclosures or automotive engine compartments when mounted on adequately sized copper pours.
How does the DHD construction benefit RD33ES-T2 thermal performance?
The DHD (Double Heatsink Diode) construction in RD33ES-T2 provides two parallel thermal conduction paths - through both anode and cathode leads - reducing effective thermal resistance versus conventional DO-34 zeners. This design allows RD33ES-T2 to sustain 400 mW dissipation at higher ambient temperatures, as validated in Fig. 6 (Power Dissipation vs. Ambient Temperature) of the official datasheet.
Is RD33ES-T2 RoHS compliant?
Yes, RD33ES-T2 is RoHS compliant. Renesas Electronics confirms environmental compliance for this product family in accordance with EU Directive 2011/65/EU, including restrictions on lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE. Full material declarations and test reports are available upon request from Renesas sales offices - RD33ES-T2 meets RoHS requirements without exemptions.
RD33ES-T2 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:
- -
RD33ES-T2 FAQ
1.How can I place an order for RD33ES-T2 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD33ES-T2 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 RD33ES-T2 reliable?
The price and inventory of RD33ES-T2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD33ES-T2 is usually 5 days.
3.What payment methods are accepted for RD33ES-T2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD33ES-T2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD33ES-T2?
RD33ES-T2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD33ES-T2 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 RD33ES-T2?
For technical support, including RD33ES-T2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD33ES-T2 requirements.
6.How does Aetrix verify that RD33ES-T2 is sourced from the original manufacturer or authorized distributors?
All RD33ES-T2 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 RD33ES-T2 meets industry standards.
7.What is the process for return or replacement of RD33ES-T2?
All RD33ES-T2 units undergo pre-shipment inspection (PSI). If there is an issue with RD33ES-T2, 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 RD33ES-T2 part is unused and in its original packaging.
Return procedure for RD33ES-T2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD33ES-T2 Tags
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