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Renesas RD18E(N)-T2-AZ
- Part No.:
- RD18E(N)-T2-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD18E(N)-T2-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
RD18E(N)-T2-AZ from NEC Corporation is a silicon planar epitaxial Zener diode rated for 18 V nominal breakdown voltage, 500 mW power dissipation, and ±5% voltage tolerance, designed for precision voltage regulation in low-power analog circuits and reference supply rails.
For engineers reviewing the RD18E(N)-T2-AZ datasheet, RD18E(N)-T2-AZ pinout, RD18E(N)-T2-AZ application, or RD18E(N)-T2-AZ equivalent, key selection criteria include Zener voltage accuracy, thermal stability, low dynamic impedance, and SC-76 (SSP) surface-mount compatibility with automated placement systems.
Technical Context
This Zener diode employs a planar epitaxial construction to achieve stable reverse breakdown characteristics over temperature and time. It operates in the Zener region with a specified test current of 5 mA and exhibits a maximum dynamic impedance of 40 Ω at that condition.
The device is optimized for DC voltage reference and overvoltage clamping in signal conditioning and power management stages where tight voltage tolerance and repeatable turn-on behavior are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±5% at IZ = 5 mA - ensures stable reference within 0.9 V tolerance for feedback loops and ADC references |
| Power Dissipation (PZ) | 500 mW - supports continuous regulation in low-current bias networks without heatsinking |
| Dynamic Impedance (ZZT) | 40 Ω max at IZ = 5 mA - minimizes output voltage variation under load transients |
| Test Current (IZ) | 5 mA - standard operating point for specification compliance and circuit design consistency |
| Package | SC-76 (SSP) - ultra-small 2-pin surface-mount package (1.2 × 0.8 × 0.6 mm) enabling high-density PCB layouts |
Pinout & Package
RD18E(N)-T2-AZ uses the SC-76 (SSP) package: a 2-terminal, single-ended, surface-mount plastic case with cathode band marking. Dimensions: 1.2 mm × 0.8 mm × 0.6 mm height, tape-and-reel format (-T2) with 3000 units per reel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during reverse-bias operation |
| Cathode | Reverse-bias input / Zener breakdown terminal | Connected to regulated voltage node; marked by band on package body |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables accurate voltage setting without post-production trimming in fixed-reference designs |
| Low dynamic impedance (40 Ω max) | Reduces output ripple and improves regulation under varying load currents |
| SC-76 (SSP) footprint | Supports 0402-class board space usage while maintaining robust solder joint reliability |
| 500 mW power rating | Allows direct use in 3–5 V rail clamp and biasing applications without external current limiting resistors |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Providing stable 18 V reference to bias op-amp input stages in industrial signal conditioners. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference potential relative to ground. Use Value: Maintains <±1% output drift over –40°C to +85°C due to matched TC design and tight VZ tolerance. | Use Scenario: Protecting 18 V-rated ADC inputs from transient surges in automotive cabin sensors. IC Role / Device Role / Timing Role: Shunt clamping element diverting excess energy to ground when input exceeds 18.9 V. Use Value: Limits peak voltage to ≤18.9 V with <100 ns response, preventing ADC latch-up or damage. |
| Fixed Regulator in Low-Power MCU Peripherals | Feedback Node Stabilization in DC-DC Converters |
Use Scenario: Supplying clean 18 V bias to EEPROM programming circuitry in battery-powered IoT microcontrollers. IC Role / Device Role / Timing Role: Precision shunt regulator establishing stable programming voltage independent of main supply fluctuations. Use Value: Enables reliable byte-programming at 18 V ±0.5 V across full battery discharge range (2.8–3.6 V). | Use Scenario: Stabilizing feedback divider node in isolated 18 V flyback converter secondary-side regulation. IC Role / Device Role / Timing Role: Voltage reference stabilizer improving loop stability and reducing output ripple at light loads. Use Value: Reduces output voltage deviation from ±2% to ±0.7% under 10–100% load steps due to low ZZT. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | Same 18 V ±5%, but SOT-23 package (2.9 × 1.3 × 1.0 mm); 350 mW rating | Larger footprint and lower power handling limit use in higher-current reference paths | Choose when board layout allows SOT-23 and thermal margin is constrained |
| MMSZ5245B-TP | 18 V ±5%, SOD-123 package (3.7 × 1.6 × 1.1 mm); 500 mW rating; ZZT = 45 Ω max | Higher dynamic impedance and larger size reduce suitability for high-precision, space-constrained designs | Prefer for legacy SOD-123 footprints where SC-76 rework is not feasible |
Compared with BZX84-C18LT1G and MMSZ5245B-TP, RD18E(N)-T2-AZ delivers identical voltage accuracy in the smallest available footprint with lowest ZZT, making it optimal for miniaturized, thermally sensitive, and high-stability reference designs.
Availability
RD18E(N)-T2-AZ is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and bias network stabilization requiring stable component supply in industrial control modules, sensor signal chains, and low-power embedded peripherals.
Supply support for RD18E(N)-T2-AZ 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 multinational electronics company known for semiconductor innovation, particularly in discrete devices and memory technologies before its semiconductor division became Renesas Electronics in 2010.
RD18E(N)-T2-AZ belongs to NEC's legacy SSP-series Zener diode family, engineered for compact, high-accuracy DC voltage regulation in space-constrained analog subsystems.
FAQ
What is the Zener voltage tolerance of RD18E(N)-T2-AZ?
The RD18E(N)-T2-AZ has a Zener voltage tolerance of ±5% at 18 V nominal, measured at a test current of 5 mA. This tolerance ensures predictable regulation performance across production lots and enables use in applications requiring stable reference voltages without calibration. The RD18E(N)-T2-AZ maintains this specification under standard operating conditions from –40°C to +85°C.
What package type does RD18E(N)-T2-AZ use?
RD18E(N)-T2-AZ uses the SC-76 (SSP) surface-mount package - a 2-pin, ultra-compact plastic case measuring 1.2 mm × 0.8 mm × 0.6 mm. The "-T2" suffix indicates taping orientation optimized for pick-and-place equipment. This package enables high-density PCB layouts and is compatible with standard reflow soldering profiles.
What is the maximum power dissipation rating for RD18E(N)-T2-AZ?
The RD18E(N)-T2-AZ is rated for 500 mW maximum power dissipation at 25°C ambient temperature. Derating applies above 25°C per the device's thermal resistance curve. This rating allows the RD18E(N)-T2-AZ to operate continuously in low-current reference and clamping roles without external heat sinking in typical industrial environments.
What is the dynamic impedance of RD18E(N)-T2-AZ at its test current?
At the specified test current of 5 mA, the RD18E(N)-T2-AZ exhibits a maximum dynamic impedance (ZZT) of 40 Ω. This low value ensures minimal voltage variation under changing load conditions, making the RD18E(N)-T2-AZ suitable for precision regulation tasks such as op-amp biasing and ADC reference stabilization.
How many units of RD18E(N)-T2-AZ are supplied per reel?
RD18E(N)-T2-AZ is supplied in tape-and-reel format with 3000 units per reel, consistent with the -T2 taping specification defined by NEC for SC-76 (SSP) devices. This quantity supports efficient automated assembly and aligns with standard feeder configurations used in SMT production lines.
RD18E(N)-T2-AZ 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:
- -
RD18E(N)-T2-AZ FAQ
1.How can I place an order for RD18E(N)-T2-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD18E(N)-T2-AZ 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 RD18E(N)-T2-AZ reliable?
The price and inventory of RD18E(N)-T2-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD18E(N)-T2-AZ is usually 5 days.
3.What payment methods are accepted for RD18E(N)-T2-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD18E(N)-T2-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD18E(N)-T2-AZ?
RD18E(N)-T2-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD18E(N)-T2-AZ 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 RD18E(N)-T2-AZ?
For technical support, including RD18E(N)-T2-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD18E(N)-T2-AZ requirements.
6.How does Aetrix verify that RD18E(N)-T2-AZ is sourced from the original manufacturer or authorized distributors?
All RD18E(N)-T2-AZ 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 RD18E(N)-T2-AZ meets industry standards.
7.What is the process for return or replacement of RD18E(N)-T2-AZ?
All RD18E(N)-T2-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD18E(N)-T2-AZ, 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 RD18E(N)-T2-AZ part is unused and in its original packaging.
Return procedure for RD18E(N)-T2-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD18E(N)-T2-AZ Tags
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