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Renesas RD33ES-T4
- Part No.:
- RD33ES-T4
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD33ES-T4.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
RD33ES-T4 from Renesas Electronics is a 33 V, 400 mW glass-encapsulated zener diode in DO-34 package 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 in power supply reference circuits.
For engineers reviewing the RD33ES-T4 datasheet, RD33ES-T4 pinout, RD33ES-T4 application, or RD33ES-T4 equivalent, this page delivers verified electrical specs, thermal performance data, JEDEC DO-34 mechanical dimensions, and validated alternative parts for voltage reference and surge suppression designs.
Technical Context
This device operates as a two-terminal silicon planar zener diode with sharp reverse breakdown characteristics, optimized for stable DC voltage reference and low-power clamping. Its DHD construction enables enhanced thermal dissipation through dual heatsinking paths along the axial leads.
The RD33ES-T4 exhibits a positive zener voltage temperature coefficient of +0.07 %/°C (≈23 mV/°C), confirmed in Fig. 9 of D13935EJ7V0DS, and supports non-repetitive surge reverse power up to 100 W for 10 µs pulses per Fig. 10.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 32.14–33.11 V at IZ = 5 mA - defines precise regulation point for feedback loops |
| Power Dissipation P | 400 mW at TA = 25°C - sets maximum continuous DC power handling on standard PCB |
| Dynamic Impedance ZZ | 65 Ω max at IZ = 5 mA - determines output voltage stability under load variation |
| Reverse Leakage IR | 0.2 µA max at VR = 25 V - ensures minimal quiescent current in standby mode |
| Surge Power PRSM | 100 W (t = 10 µs) - enables transient overvoltage absorption without failure |
| Junction Temp Tj | 175°C max - allows operation in high-ambient industrial environments |
| Package | DO-34 (JEDEC) - 2.4 mm max body length, 5 mm lead pitch, glass-sealed axial package |
Pinout & Package
DO-34 package: axial-leaded, glass-encapsulated cylindrical body with cathode band marking (black). Leads are tinned copper alloy; body diameter ≤1.8 mm, overall length ≤4.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher potential side to enable controlled avalanche conduction |
Key Features
| Feature | Design Value |
|---|---|
| DHD construction | Dual heatsink path reduces thermal resistance by ~25% vs. standard DO-34 diodes, improving long-term reliability at 400 mW |
| Planar process | Enables tight VZ tolerance (±5%) and repeatable knee characteristics across production lots |
| E24 standard VZ | 33 V nominal aligns with E24 series for seamless BOM integration with common reference designs |
| DO-34 package | Supports 5 mm PCB pitch insertion - compatible with legacy wave-solder and hand-assembly processes |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or op-amp-based shunt regulators. IC Role / Device Role / Timing Role: Provides fixed 33 V reference node for error amplifier comparison. Use Value: Maintains ±1% output regulation accuracy over 0–70°C ambient with <65 Ω dynamic impedance. | Use Scenario: Protecting microcontroller I/O pins from ESD or inductive kickback transients. IC Role / Device Role / Timing Role: Shunts excess energy above 33 V to ground during fast-rising surges. Use Value: Absorbs 100 W for 10 µs without degradation, limiting voltage to safe levels for 3.3 V/5 V logic. |
| Waveform Clipper | Constant Current Source |
Use Scenario: Limiting AC signal amplitude in audio preamplifier stages or sensor signal conditioning. IC Role / Device Role / Timing Role: Clamps positive peaks at 33 V while passing negative half-cycles unaltered. Use Value: Sharp knee (ZZK = 250 Ω) ensures clean clipping threshold with minimal distortion. | Use Scenario: Setting bias current for LED drivers or transistor amplifiers via constant-voltage drop. IC Role / Device Role / Timing Role: Acts as stable voltage reference in emitter-degenerated current mirror topologies. Use Value: Delivers 5 mA test current with <0.2 µA leakage, enabling sub-1% current accuracy over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5257BRLG | 33 V, ±5%, 500 mW, DO-35 package, 70 Ω ZZ, 100 ns recovery | Higher power rating but larger DO-35 footprint; no DHD thermal enhancement | Preferred where board space permits and >400 mW margin is required |
| BZX55-C33 | 33 V, ±5%, 500 mW, DO-35, 70 Ω ZZ, 1 µA IR at 25 V | Higher leakage (1 µA vs. 0.2 µA); identical VZ tolerance and regulation performance | Valid alternative when tighter leakage is not critical and DO-35 is acceptable |
Compared with RD33ES-T4, 1N5257BRLG offers 100 mW extra dissipation but requires PCB layout change due to DO-35 size; BZX55-C33 matches VZ and tolerance but trades 5× higher leakage for broader distributor availability.
Availability
RD33ES-T4 is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and waveform clipper circuits requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for RD33ES-T4 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 specializing in microcontrollers, analog, and power devices, formed in 2010 via merger of NEC Electronics and Renesas Technology.
The RD2.0ES–RD39ES series was designed for cost-sensitive, high-reliability voltage reference and protection functions in standard-grade industrial and consumer equipment.
FAQ
What is the zener voltage tolerance for RD33ES-T4?
The RD33ES-T4 has a zener voltage range of 32.14 V to 33.11 V at IZ = 5 mA, corresponding to ±5% tolerance about the nominal 33 V rating. This is confirmed in Table on page 3 of datasheet D13935EJ7V0DS and applies specifically to the AB2 suffix variant within the RD33ES family.
Does RD33ES-T4 support surge protection applications?
Yes, RD33ES-T4 supports non-repetitive surge protection with a rated surge reverse power (PRSM) of 100 W for pulse width t = 10 µs, as specified in Absolute Maximum Ratings and illustrated in Fig. 10 of D13935EJ7V0DS - making it suitable for transient voltage suppression in low-energy interfaces.
What is the thermal resistance junction-to-ambient for RD33ES-T4?
RD33ES-T4 does not specify a single RthJA value; instead, its power derating is defined in Fig. 6 of D13935EJ7V0DS, showing 400 mW at 25°C ambient dropping to 0 mW at 150°C. Thermal performance depends on PCB copper area - e.g., 7 mm² board yields ~375°C/W per Fig. 7.
Is RD33ES-T4 RoHS compliant?
Yes, RD33ES-T4 is RoHS compliant. Although the original 2003 datasheet predates EU RoHS Directive enforcement, Renesas Electronics confirms all active DO-34 zener diodes including RD33ES-T4 meet RoHS requirements per their environmental compliance documentation and material declarations.
What is the reverse leakage current specification for RD33ES-T4?
The reverse leakage current (IR) for RD33ES-T4 is 0.2 µA maximum at VR = 25 V and TA = 25°C, as stated in the Electrical Characteristics table on page 3 of datasheet D13935EJ7V0DS - critical for low-power standby circuit design.
RD33ES-T4 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-T4 FAQ
1.How can I place an order for RD33ES-T4 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD33ES-T4 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-T4 reliable?
The price and inventory of RD33ES-T4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD33ES-T4 is usually 5 days.
3.What payment methods are accepted for RD33ES-T4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD33ES-T4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD33ES-T4?
RD33ES-T4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD33ES-T4 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-T4?
For technical support, including RD33ES-T4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD33ES-T4 requirements.
6.How does Aetrix verify that RD33ES-T4 is sourced from the original manufacturer or authorized distributors?
All RD33ES-T4 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-T4 meets industry standards.
7.What is the process for return or replacement of RD33ES-T4?
All RD33ES-T4 units undergo pre-shipment inspection (PSI). If there is an issue with RD33ES-T4, 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-T4 part is unused and in its original packaging.
Return procedure for RD33ES-T4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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