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Renesas RD33ES-T1
- Part No.:
- RD33ES-T1
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD33ES-T1.pdf
- Description:
- DIODE ZENER
- Quantity:
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- Shipping:
Inventory:94,000
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Product details
Overview
RD33ES-T1 from Renesas Electronics is a 33 V, 400 mW DO-34 glass-sealed Zener diode with DHD (Double Heatsink Diode) construction, ±5% zener voltage tolerance at 5 mA test current, 65 Ω dynamic impedance, and 0.2 µA reverse leakage at 25 V, used for precision voltage regulation and surge suppression in low-power analog circuits.
For engineers reviewing the RD33ES-T1 datasheet, RD33ES-T1 pinout, RD33ES-T1 application, or RD33ES-T1 equivalent, this page delivers verified electrical specs, thermal derating behavior, JEDEC DO-34 package details, and direct alternatives for constant-voltage reference, waveform clipping, and transient protection design.
Technical Context
The RD33ES-T1 operates as a two-terminal voltage reference device using planar silicon junction technology. Its DHD construction enables enhanced thermal dissipation through dual heatsinking paths within the DO-34 glass package, supporting stable 33 V regulation across ambient temperatures up to +125°C before derating.
It exhibits a positive zener voltage temperature coefficient of +0.055 %/°C (≈+18 mV/°C), confirmed in Fig. 9 of D13935EJ7V0DS, and maintains ≤0.2 µA reverse current at VR = 25 V - critical for low-leakage bias networks and high-impedance sensing interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 32.14–33.79 V at IZ = 5 mA - defines tight regulation window for 33 V reference designs |
| Dynamic Impedance (ZZ) | 65 Ω max at IZ = 5 mA - ensures minimal output voltage shift under load variation |
| Power Dissipation (P) | 400 mW at TA = 25°C - sets maximum continuous DC power handling in free-air conditions |
| Reverse Leakage (IR) | 0.2 µA max at VR = 25 V - guarantees negligible current draw in standby or high-Z monitoring nodes |
| Surge Power (PRSM) | 100 W non-repetitive (t = 10 µs) - supports transient overvoltage clamping without failure |
| Junction Temp (Tj) | 175°C max - allows operation in thermally constrained industrial enclosures with proper PCB copper area |
| Package | DO-34 (JEDEC) - 2.4 mm max body length, 5 mm lead pitch, glass-sealed, axial leads for through-hole mounting |
Pinout & Package
RD33ES-T1 uses a standard two-terminal DO-34 axial package: anode and cathode are identified by a black band marking on the cathode end. The device has no active control pins - terminals serve only as bidirectional conduction path with reverse-biased zener breakdown function.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit common or lower-potential rail; establishes reference polarity for regulation |
| Cathode | Zener breakdown terminal / Output voltage node | Marked with black band; supplies regulated 33 V when reverse biased above VZ threshold |
Key Features
| Feature | Design Value |
|---|---|
| DHD Construction | Enables 400 mW dissipation in compact DO-34 package via dual thermal paths to PCB leads |
| E24 Standard VZ | 33 V nominal aligns with IEC 60063 E24 series - simplifies BOM consolidation and sourcing |
| Planar Process | Ensures repeatable VZ tolerance (±5%), low ZZK knee impedance, and stable long-term drift |
| Short Lead Pitch | 5 mm center-to-center lead spacing - supports dense PCB layouts without lead bending |
| High Surge Rating | 100 W peak pulse (10 µs) - protects downstream ICs from ESD and inductive kick events |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Zener reference providing fixed 33 V bias to Wheatstone bridge, enabling ratiometric ADC measurements. Use Value: 65 Ω ZZ and <0.2 µA IR minimize measurement error from supply loading and leakage-induced offset drift. |
Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers during brown-out conditions. IC Role / Device Role / Timing Role: Clamping voltage on RC network to define precise 33 V trigger point for external reset supervisor IC. Use Value: Tight ±5% VZ tolerance and predictable TC ensure consistent reset assertion across –40°C to +85°C operating range. |
| Audio Equipment DC Rail Clamp | Surge-Protected RS-232 Interface |
|
Use Scenario: Limiting peak voltage on analog audio signal paths to prevent op-amp saturation. IC Role / Device Role / Timing Role: Bidirectional waveform clipper placed across differential line inputs to constrain excursion to ±33 V. Use Value: Symmetrical forward/reverse conduction and 100 W surge rating absorb transient spikes without latch-up. |
Use Scenario: Protecting RS-232 transceiver inputs against ESD and cable discharge events. IC Role / Device Role / Timing Role: Shunt element connected between data line and ground, clamping surges above 33 V. Use Value: DO-34 mechanical robustness and 10 µs surge response time meet IEC 61000-4-2 Level 4 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A-T | Same 33 V nominal, but 1 W rating, DO-41 package, 10 Ω ZZ, higher IR (1 µA @ 25 V) | Better for higher-power regulation; less suitable for ultra-low-leakage bias networks | Select when >400 mW continuous dissipation or lower dynamic impedance is required |
| BZX55-C33 | 33 V, 500 mW, DO-35 package, ±5% tolerance, 70 Ω ZZ, 0.1 µA IR @ 25 V | Smaller footprint, slightly tighter IR spec, but lower surge rating (50 W) | Prefer for space-constrained boards where 50 W surge margin suffices and DO-35 is acceptable |
Compared with RD33ES-T1, 1N4733A-T offers higher power and lower impedance but requires PCB layout changes due to DO-41 size and higher leakage; BZX55-C33 matches leakage performance and fits tighter spaces but sacrifices surge robustness and thermal mass for transient clamping.
Availability
RD33ES-T1 is available at Aetrix Electronics and suitable for industrial sensor conditioning, microcontroller reset generation, audio signal clamping, and RS-232 interface protection requiring stable component supply and long-lifecycle support.
Supply support for RD33ES-T1 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 formed in 2010 from the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices for industrial and automotive markets.
The RD33ES-T1 belongs to the legacy RD2.0ES–RD39ES Zener diode family designed for general-purpose voltage reference and transient suppression in Standard-grade applications including office equipment, test instruments, and consumer electronics.
FAQ
What is the exact zener voltage range for RD33ES-T1 at 5 mA test current?
The RD33ES-T1 has a guaranteed zener voltage range of 32.14 V to 33.79 V when measured at IZ = 5 mA and TA = 25°C, per the AB2 suffix specification in Renesas datasheet D13935EJ7V0DS. This ±5% tolerance reflects E24 standard compliance and applies strictly under pulsed 40 ms test conditions.
Does RD33ES-T1 support surface-mount assembly?
No, RD33ES-T1 is exclusively offered in the axial DO-34 glass package with through-hole leads. It is not available in SMD variants such as SOD-123 or DO-213AB. Designers requiring surface-mount compatibility must select alternative parts like BZX55-C33 (DO-35) or MMBZ5256BLT1G (SOT-23).
What is the maximum allowable ambient temperature before power derating begins for RD33ES-T1?
RD33ES-T1 maintains full 400 mW power dissipation up to TA = 25°C. Derating begins linearly beyond that point, reaching zero dissipation at TA = 175°C, as shown in Fig. 6 of D13935EJ7V0DS. At 75°C ambient, usable power drops to approximately 250 mW.
How does the temperature coefficient of RD33ES-T1 affect its regulation accuracy over temperature?
RD33ES-T1 has a positive zener voltage temperature coefficient of +0.055 %/°C (≈+18 mV/°C), meaning its VZ increases ~18 mV per °C rise. Over a –40°C to +85°C range, this introduces up to ±2.25 V drift - a key consideration for precision references, mitigated by using it in temperature-stable environments or with compensation networks.
Can RD33ES-T1 be used in place of a 33 V TVS diode for ESD protection?
RD33ES-T1 is not rated or characterized as a TVS diode. While it clamps at ~33 V and handles 100 W surges (10 µs), its response time, capacitance, and reliability under repetitive ESD stress are unspecified. For certified IEC 61000-4-2 protection, dedicated TVS devices like P6KE33CA are recommended instead of RD33ES-T1.
RD33ES-T1 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-T1 FAQ
1.How can I place an order for RD33ES-T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD33ES-T1 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-T1 reliable?
The price and inventory of RD33ES-T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD33ES-T1 is usually 5 days.
3.What payment methods are accepted for RD33ES-T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD33ES-T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD33ES-T1?
RD33ES-T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD33ES-T1 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-T1?
For technical support, including RD33ES-T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD33ES-T1 requirements.
6.How does Aetrix verify that RD33ES-T1 is sourced from the original manufacturer or authorized distributors?
All RD33ES-T1 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-T1 meets industry standards.
7.What is the process for return or replacement of RD33ES-T1?
All RD33ES-T1 units undergo pre-shipment inspection (PSI). If there is an issue with RD33ES-T1, 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-T1 part is unused and in its original packaging.
Return procedure for RD33ES-T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD33ES-T1 Tags
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