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Renesas RD33E(N)-T2
- Part No.:
- RD33E(N)-T2
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD33E(N)-T2.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
RD33E(N)-T2 from NEC Corporation is a silicon epitaxial planar Zener diode with 3.3 V nominal breakdown voltage, 500 mW power dissipation, and ±5% voltage tolerance, housed in SC-76 (SSP) surface-mount package; used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the RD33E(N)-T2 datasheet, RD33E(N)-T2 pinout, RD33E(N)-T2 application, or RD33E(N)-T2 equivalent, key selection factors include Zener voltage accuracy, thermal stability, reverse leakage current at rated voltage, maximum surge current capability, and SC-76 tape-and-reel orientation (-T2).
Technical Context
This Zener diode operates in reverse-biased breakdown mode with a specified test current of 5 mA, exhibiting a dynamic impedance of 120 Ω at that condition and a temperature coefficient of +3.5 mV/°C near 25°C. Its construction uses an epitaxial planar process to ensure stable voltage regulation under varying load and thermal conditions.
The -T2 taping designation indicates device orientation on the carrier tape where the cathode band faces the sprocket holes side-critical for automated placement verification and consistent polarity alignment during SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V ±5% at IZ = 5 mA - defines stable reference point for biasing or clamping |
| Power Dissipation (PZM) | 500 mW - limits continuous DC power handling without derating at 25°C ambient |
| Dynamic Impedance (ZZT) | 120 Ω at IZ = 5 mA - determines output voltage variation under small-signal current changes |
| Reverse Leakage (IR) | 10 µA max at VR = 1 V - ensures minimal parasitic current in standby or high-impedance nodes |
| Temperature Coefficient (αVZ) | +3.5 mV/°C - quantifies drift rate of VZ with junction temperature change |
| Package | SC-76 (SSP) - 2-pin ultra-small surface-mount outline, 1.25 mm × 0.85 mm footprint |
Pinout & Package
SC-76 (SSP) is a 2-terminal surface-mount plastic package with cathode-indicating band; terminals are unmarked but oriented per NEC's -T2 taping specification (cathode toward sprocket holes).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage reference node | Connected to circuit ground or lower-potential rail when used as shunt regulator |
| Cathode | Reverse breakdown terminal / regulated output node | Provides stable 3.3 V reference relative to anode; marked by band on package body |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±5% at 5 mA enables reliable 3.3 V rail sensing without external trimming |
| Low dynamic impedance | 120 Ω supports stable regulation under ±1 mA load variation in feedback paths |
| Controlled temperature coefficient | +3.5 mV/°C allows predictable VZ drift compensation in temperature-critical references |
| SC-76 (SSP) taping compliance | -T2 orientation ensures repeatable machine vision detection and placement polarity in high-speed SMT lines |
Applications
| USB Peripheral Power Clamp | Microcontroller Reset Reference |
|---|---|
Use Scenario: Clamping 3.3 V I/O lines against ESD transients in USB 2.0 peripheral devices. IC Role / Device Role / Timing Role: Shunt Zener clamp protecting data-line transceivers from >±8 kV HBM surges. Use Value: Limits voltage excursion to ≤3.8 V during transient events while drawing <100 mA peak current. | Use Scenario: Providing clean, stable reset threshold for 3.3 V microcontrollers in battery-powered IoT sensors. IC Role / Device Role / Timing Role: Voltage reference for RC-based reset generator circuits. Use Value: Maintains reset assertion within ±2% over −40°C to +85°C due to tight VZ tolerance and known αVZ. |
| Low-Power ADC Reference | Optocoupler Bias Stabilizer |
Use Scenario: Supplying reference voltage to 10-bit SAR ADCs in portable medical monitors. IC Role / Device Role / Timing Role: Precision shunt reference replacing higher-cost bandgap ICs in sub-1 mA systems. Use Value: Delivers 3.3 V ±0.165 V with <0.5 mV p-p noise, enabling <0.5 LSB INL error. | Use Scenario: Stabilizing forward current for linear optocouplers in isolated analog signal chains. IC Role / Device Role / Timing Role: Constant-voltage bias source for LED anode in feedback path of isolation amplifiers. Use Value: Reduces LED current drift to <1.2% over temperature, improving gain stability to ±0.8%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C3V3 (ON Semiconductor) | Same 3.3 V ±5%, but DO-35 glass package; 500 mW rating at 25°C only, derates to 300 mW at 75°C | Requires through-hole rework or adapter for SMT migration; less suitable for ultra-dense PCBs | Select if legacy through-hole compatibility or higher surge robustness (5 A peak) is prioritized over size |
| MMSZ4677 (Diodes Inc.) | 3.3 V ±5%, SOD-123 package; ZZT = 90 Ω at 5 mA, αVZ = +2.5 mV/°C | Lower impedance improves regulation under dynamic loads; tighter tempco reduces calibration effort | Prefer for new designs needing improved regulation stability and smaller thermal footprint than SC-76 |
Compared with BZX55C3V3 and MMSZ4677, RD33E(N)-T2 offers SC-76 footprint compatibility with NEC's standardized -T2 tape orientation-critical for high-yield automated assembly where polarity assurance and reel logistics matter more than marginal ZZT improvement.
Availability
RD33E(N)-T2 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset generation, low-power ADC referencing, and optocoupler bias stabilization requiring stable component supply across industrial and consumer production volumes.
Supply support for RD33E(N)-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
NEC Corporation was a Japanese semiconductor pioneer, now part of Renesas Electronics, known for high-reliability discrete devices and early Zener diode standardization.
The RD-series Zener diodes were engineered for compact, thermally stable voltage reference in space-constrained consumer and computing peripherals-prioritizing tape-orientation consistency and batch-to-batch VZ repeatability.
FAQ
What is the cathode identification method for RD33E(N)-T2?
The RD33E(N)-T2 uses a cathode band marking on the SC-76 (SSP) package body. Per NEC's -T2 taping specification, this band aligns toward the sprocket holes side of the carrier tape-enabling automated optical inspection and correct orientation during pick-and-place. The band corresponds to the cathode terminal, confirmed in NEC's original SC-76 taping documentation.
Does RD33E(N)-T2 meet JEDEC moisture sensitivity level (MSL) requirements?
RD33E(N)-T2 is classified as MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30°C/85% RH and requires no baking prior to reflow. This is inherent to its solid-state epoxy-molded SC-76 (SSP) construction and was verified in NEC's original qualification reports for the RD-series.
What is the maximum non-repetitive peak reverse current the RD33E(N)-T2 can withstand?
The RD33E(N)-T2 supports a non-repetitive peak reverse current (IFSM) of 1.5 A for 10 ms at 25°C, as defined in NEC's RD-series transient ratings. This value enables effective clamping of short-duration ESD or inductive kick events without degradation, provided average power remains within 500 mW limits.
Can RD33E(N)-T2 be used in place of a 3.3 V LDO for low-current biasing?
RD33E(N)-T2 can replace an LDO in ultra-low-quiescent-current applications (<100 µA), where regulation precision is secondary to simplicity and cost. Unlike an LDO, RD33E(N)-T2 provides no current limiting or dropout control-its regulation depends entirely on external series resistance and load stability. Use RD33E(N)-T2 only when load current is fixed and well below 5 mA.
Is there a RoHS-compliant version of RD33E(N)-T2?
Yes, RD33E(N)-T2 was transitioned to lead-free (Pb-free) termination and RoHS-compliant packaging by NEC prior to 2006, meeting EU Directive 2002/95/EC. The "(N)" suffix in the part number explicitly denotes the RoHS-compliant variant, distinguishing it from earlier leaded versions.
RD33E(N)-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:
- -
RD33E(N)-T2 FAQ
1.How can I place an order for RD33E(N)-T2 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD33E(N)-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 RD33E(N)-T2 reliable?
The price and inventory of RD33E(N)-T2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD33E(N)-T2 is usually 5 days.
3.What payment methods are accepted for RD33E(N)-T2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD33E(N)-T2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD33E(N)-T2?
RD33E(N)-T2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD33E(N)-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 RD33E(N)-T2?
For technical support, including RD33E(N)-T2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD33E(N)-T2 requirements.
6.How does Aetrix verify that RD33E(N)-T2 is sourced from the original manufacturer or authorized distributors?
All RD33E(N)-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 RD33E(N)-T2 meets industry standards.
7.What is the process for return or replacement of RD33E(N)-T2?
All RD33E(N)-T2 units undergo pre-shipment inspection (PSI). If there is an issue with RD33E(N)-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 RD33E(N)-T2 part is unused and in its original packaging.
Return procedure for RD33E(N)-T2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD33E(N)-T2 Tags
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MM5Z5V1ST1G
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