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Renesas RD3.3UH-T1-A
- Part No.:
- RD3.3UH-T1-A
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD3.3UH-T1-A.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
RD3.3UH-T1-A from Renesas Electronics is a 3.3 V, 400 mW DO-34 glass-sealed Zener diode with DHD (Double Heatsink Diode) construction, ±5% zener voltage tolerance at 5 mA test current, 20 Ω dynamic impedance, and 0.5 µA reverse leakage at 1 V, used for precision voltage regulation in low-power analog reference circuits.
For engineers reviewing the RD3.3UH-T1-A datasheet, RD3.3UH-T1-A pinout, RD3.3UH-T1-A application, or RD3.3UH-T1-A equivalent, this page provides verified electrical parameters, thermal performance data, JEDEC DO-34 package details, and validated alternative parts for constant-voltage reference, surge suppression, and waveform clamping designs.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. It uses planar diffusion technology and DHD construction to achieve 400 mW power dissipation at 25°C ambient with junction-to-ambient thermal resistance of 375°C/W on a 7 mm² PCB.
Its zener voltage temperature coefficient is –0.03 %/°C (typical), enabling predictable drift behavior in temperature-sensitive references. The device supports non-repetitive surge reverse power up to 100 W for 10 µs pulses, making it suitable for transient overvoltage protection in signal conditioning paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V ±5% at IZ = 5 mA - defines nominal regulation point with tight tolerance for reference stability |
| Power Dissipation (P) | 400 mW at TA = 25°C - sets maximum continuous DC power handling on standard PCB layout |
| Dynamic Impedance (ZZ) | 20 Ω at IZ = 5 mA - determines output impedance and regulation sensitivity to current changes |
| Reverse Leakage (IR) | 0.5 µA at VR = 1 V - ensures minimal error current in high-impedance bias networks |
| Surge Power (PRSM) | 100 W for t = 10 µs - enables transient absorption without failure in ESD-prone interfaces |
| Junction Temperature (Tj) | 175°C maximum - allows operation in elevated ambient environments with proper derating |
| Package | DO-34 (JEDEC) - axial glass-body package with 5 mm lead pitch for through-hole PCB assembly |
Pinout & Package
RD3.3UH-T1-A is housed in a DO-34 glass-sealed axial package per JEDEC standards, with cathode indicated by a black band. Leads are tinned and suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node to enable regulation |
Key Features
| Feature | Design Value |
|---|---|
| DHD construction | Enables 400 mW dissipation in compact DO-34 package via dual thermal path to PCB leads |
| Planar process | Ensures consistent breakdown characteristics and low parameter variation across production lots |
| E24-standard VZ | Supports standardized 3.3 V reference selection aligned with common resistor and capacitor series |
| Short-pitch compatibility | 5 mm lead spacing allows dense PCB layouts without lead bending or stress concentration |
Applications
| Low-Voltage Reference Source | Signal-Level Clipping Circuit |
|---|---|
Use Scenario: Providing stable 3.3 V bias for op-amp input stages or ADC reference dividers in battery-powered sensors. IC Role / Device Role / Timing Role: Zener voltage reference element establishing fixed potential for analog signal conditioning. Use Value: Delivers ±5% regulation accuracy with 20 Ω dynamic impedance, minimizing error contribution in sub-1 mA bias networks. | Use Scenario: Limiting audio or sensor signal peaks to prevent amplifier saturation or ADC clipping in portable instrumentation. IC Role / Device Role / Timing Role: Bidirectional voltage clamp using forward diode drop + reverse zener action. Use Value: Symmetric clamping thresholds (≈0.7 V forward / 3.3 V reverse) preserve signal integrity while limiting excursion amplitude. |
| Surge Protection Node | Constant-Current Bias Generator |
Use Scenario: Absorbing ESD transients on RS-232 or GPIO lines before they reach sensitive logic inputs. IC Role / Device Role / Timing Role: Transient voltage suppressor shunting energy during fast-rising overvoltage events. Use Value: Withstands 100 W surges for 10 µs, protecting downstream ICs without degradation under repeated exposure. | Use Scenario: Generating precise 1 mA bias current for photodiode amplifiers or temperature sensor bridges. IC Role / Device Role / Timing Role: Current source formed by series resistor + Zener regulating voltage across resistor. Use Value: Maintains stable 3.3 V reference despite supply ripple, yielding <1% current variation over 0–100 kHz noise bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | Same 3.3 V nominal VZ, but 1 W rating and DO-41 package - larger footprint and higher thermal mass | Preferred where higher surge margin or board-level heat spreading is required | Select when >400 mW continuous dissipation or >100 W pulse handling is needed |
| BZX55-C3V3 | 3.3 V VZ, 500 mW rating, DO-35 package - slightly higher power but different mechanical form factor | Used in space-constrained designs requiring axial leaded alternatives with tighter tolerance options | Choose when DO-35 mounting compatibility or tighter ±2% VZ variants are required |
Compared with RD3.3UH-T1-A, 1N4728A offers greater surge robustness and thermal headroom in a larger package, while BZX55-C3V3 provides higher power rating and tighter tolerance options in a physically smaller DO-35 body - both require layout adjustment due to differing lead pitch and body dimensions.
Availability
RD3.3UH-T1-A is available at Aetrix Electronics and suitable for low-power voltage reference, signal clamping, surge suppression, and constant-current bias applications requiring stable component supply and long-term obsolescence management.
Supply support for RD3.3UH-T1-A 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 manufacturer headquartered in Japan, specializing in microcontrollers, analog and power devices, and system-on-chip solutions for industrial, automotive, and consumer markets.
RD3.3UH-T1-A belongs to the legacy RDx.xES Zener diode family originally developed by NEC Electronics and continued under Renesas, designed specifically for precision voltage regulation and transient protection in cost-sensitive, high-volume analog circuits.
FAQ
What is the zener voltage tolerance of RD3.3UH-T1-A at 5 mA test current?
The RD3.3UH-T1-A has a zener voltage tolerance of ±5% at IZ = 5 mA, corresponding to a guaranteed range of 3.16 V to 3.38 V. This tolerance is specified per the original NEC D13935EJ7V0DS datasheet and applies to all units within the RD3.3ES series including RD3.3UH-T1-A. The value reflects manufacturing consistency under standard test conditions and must be derated for temperature effects in final design validation.
Does RD3.3UH-T1-A have a specified zener voltage temperature coefficient?
Yes, RD3.3UH-T1-A exhibits a typical zener voltage temperature coefficient of –0.03 %/°C, as documented in Figure 9 of the D13935EJ7V0DS datasheet. This negative coefficient means the zener voltage decreases slightly with rising temperature, which is characteristic of low-voltage Zeners below ~5 V. Designers should account for this drift when using RD3.3UH-T1-A in temperature-critical reference applications.
What is the maximum surge reverse power rating for RD3.3UH-T1-A?
The RD3.3UH-T1-A supports a non-repetitive surge reverse power of 100 W for pulse widths of 10 µs, as shown in Figure 10 of the official datasheet. This rating enables the device to absorb transient overvoltages such as ESD or inductive kickback without failure, provided the pulse repetition rate remains low enough to avoid cumulative thermal stress on the junction.
Is RD3.3UH-T1-A compliant with RoHS requirements?
RD3.3UH-T1-A meets EU RoHS Directive requirements as confirmed by Renesas Electronics' environmental compliance documentation. The DO-34 glass package contains no lead in the solderable terminations beyond RoHS-exempt levels, and all materials comply with restricted substance limits. Customers should verify current compliance status via Renesas' official product environmental reports prior to high-reliability or regulated-market deployment.
What is the thermal resistance from junction to ambient for RD3.3UH-T1-A on a 7 mm² PCB?
The junction-to-ambient thermal resistance (RthJA) of RD3.3UH-T1-A is 375°C/W when mounted on a 7 mm² PCB with 0.035 mm copper thickness, per Figure 7 in the D13935EJ7V0DS datasheet. This value assumes standard DO-34 mounting with both leads soldered and defines the baseline for power derating curves - for example, at 70°C ambient, maximum allowable power drops to approximately 280 mW.
RD3.3UH-T1-A 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:
- -
RD3.3UH-T1-A FAQ
1.How can I place an order for RD3.3UH-T1-A through Aetrix?
Please submit a Request for Quotation (RFQ) for RD3.3UH-T1-A 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 RD3.3UH-T1-A reliable?
The price and inventory of RD3.3UH-T1-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD3.3UH-T1-A is usually 5 days.
3.What payment methods are accepted for RD3.3UH-T1-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD3.3UH-T1-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD3.3UH-T1-A?
RD3.3UH-T1-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD3.3UH-T1-A 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 RD3.3UH-T1-A?
For technical support, including RD3.3UH-T1-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD3.3UH-T1-A requirements.
6.How does Aetrix verify that RD3.3UH-T1-A is sourced from the original manufacturer or authorized distributors?
All RD3.3UH-T1-A 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 RD3.3UH-T1-A meets industry standards.
7.What is the process for return or replacement of RD3.3UH-T1-A?
All RD3.3UH-T1-A units undergo pre-shipment inspection (PSI). If there is an issue with RD3.3UH-T1-A, 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 RD3.3UH-T1-A part is unused and in its original packaging.
Return procedure for RD3.3UH-T1-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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