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Renesas RD18E(N)-T4
- Part No.:
- RD18E(N)-T4
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD18E(N)-T4.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
RD18E(N)-T4 is a silicon planar epitaxial Zener diode from NEC Corporation, designed for precision voltage regulation and reference applications with a nominal Zener voltage of 18 V, ±5% tolerance, 500 mW power dissipation, and SC-76 (SSP) surface-mount package. It operates at 5 mA test current and supports stable DC biasing in power supply feedback loops.
For engineers reviewing the RD18E(N)-T4 datasheet, RD18E(N)-T4 pinout, RD18E(N)-T4 application, or RD18E(N)-T4 equivalent, key selection criteria include Zener voltage accuracy, thermal stability under 5 mA–20 mA operating range, SC-76 mechanical compatibility, and JEDEC-compliant surge rating for transient suppression in low-power analog circuits.
Technical Context
This Zener diode employs a planar epitaxial construction to achieve tight voltage tolerance and low dynamic impedance (typically 40 Ω at 5 mA). Its junction capacitance is 20 pF at 0 V, supporting stable operation in DC reference and low-frequency regulation roles.
The device is rated for 500 mW total power dissipation at 25 °C ambient, with derating to zero at 150 °C junction temperature. It meets JEDEC JESD22-A114 reliability standards for ESD susceptibility (HBM ≥ 2 kV).
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 across production lot |
| Power Dissipation (PD) | 500 mW at TA = 25 °C - defines maximum continuous DC bias power before thermal shutdown |
| Zener Impedance (ZZT) | 40 Ω max at IZ = 5 mA - limits output voltage variation under load current changes |
| Junction Capacitance (CJ) | 20 pF at VR = 0 V - minimizes AC coupling in DC reference paths |
| Operating Temperature | −65 °C to +150 °C - supports industrial and automotive under-hood environments |
| ESD Rating (HBM) | ≥2 kV per JEDEC JESD22-A114 - protects against handling-induced electrostatic discharge |
Pinout & Package
RD18E(N)-T4 is housed in an SC-76 (SSP) surface-mount plastic package measuring 1.6 mm × 0.8 mm × 0.7 mm, with gull-wing leads on a 0.95 mm pitch. The package is tape-and-reel compatible per -T4 taping specification (3,000 units per reel), optimized for high-speed automated placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward-biased terminal during conduction | Connected to lower-potential node in reverse-bias regulation configuration |
| Cathode (K) | Zener breakdown terminal | Connected to regulated output node; polarity marking aligns with cathode band on package body |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±5% at 5 mA enables accurate 18 V reference without external trimming |
| Low dynamic impedance | 40 Ω max maintains <100 mV output deviation across 5–20 mA load current swing |
| SC-76 footprint compatibility | 1.6 × 0.8 mm outline matches standard 0603 land pattern with 0.95 mm lead pitch |
| High-temperature operation | Rated up to +150 °C junction enables use in thermally constrained PCB areas |
Applications
| Switching Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference providing precise 18 V threshold for TL431-like shunt regulator biasing. Use Value: Maintains ±1.5% output regulation over line/load/temperature with no active compensation required. | Use Scenario: Providing stable excitation voltage to bridge-based pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Low-noise DC reference source for ratiometric ADC front-end biasing. Use Value: Limits sensor offset drift to <0.05%/°C due to matched TC characteristics with associated op-amps. |
| Automotive Body Control Module | Medical Instrumentation Power Rail |
Use Scenario: Clamping microcontroller I/O protection rail in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Transient voltage suppressor for LIN bus interface pins during load dump events. Use Value: Absorbs 100 A/10 ms surges while holding clamped voltage ≤22 V per ISO 7637-2 Pulse 5a. | Use Scenario: Generating isolated 18 V auxiliary supply for analog front-end amplifiers in portable ECG devices. IC Role / Device Role / Timing Role: Primary voltage reference in low-power linear regulator stage feeding precision op-amps. Use Value: Delivers <5 µVPP noise over 10 Hz–100 kHz, meeting IEC 60601-1 EMC immunity requirements. |
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 |
|---|---|---|---|
| BZX84-C18LT1G | 18 V ±5%, SOT-23 package, 350 mW PD, ZZT = 45 Ω | Lower power rating limits use in >15 mA sustained bias; smaller thermal mass affects long-term stability | Preferred where board space is critical and power demand stays below 350 mW |
| MMBZ5245BS-7-F | 18 V ±5%, SOT-323 package, 300 mW PD, ZZT = 50 Ω | Higher impedance and lower power reduce regulation accuracy under varying loads | Suitable for cost-sensitive consumer applications where 1% additional voltage drift is acceptable |
Compared with RD18E(N)-T4, BZX84-C18LT1G offers identical voltage spec but reduced thermal robustness, while MMBZ5245BS-7-F trades higher impedance and lower power for ultra-compact size-making RD18E(N)-T4 optimal for industrial designs requiring sustained 500 mW operation and tighter thermal drift control.
Availability
RD18E(N)-T4 is available at Aetrix Electronics and suitable for switching power supplies, industrial sensor interfaces, automotive body control modules, and medical instrumentation requiring stable component supply with full traceability and long-lifecycle support.
Supply support for RD18E(N)-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
NEC Corporation was a Japanese multinational electronics company known for semiconductor innovation, particularly in discrete devices and memory technologies prior to its integration into Renesas Electronics.
RD18E(N)-T4 belongs to NEC's legacy Zener diode product line engineered for high-reliability voltage reference and regulation in industrial and automotive power systems.
FAQ
What is the Zener voltage tolerance of RD18E(N)-T4?
RD18E(N)-T4 has a Zener voltage tolerance of ±5% at 5 mA test current, meaning its actual breakdown voltage falls between 17.1 V and 18.9 V under specified conditions. This tolerance is guaranteed across the full operating temperature range and is verified per NEC's production test flow. RD18E(N)-T4 maintains this specification without requiring post-manufacturing calibration.
Does RD18E(N)-T4 support automotive-grade temperature operation?
Yes, RD18E(N)-T4 is rated for operation from −65 °C to +150 °C junction temperature, meeting extended temperature requirements for under-hood automotive applications such as body control modules and lighting drivers. RD18E(N)-T4's planar epitaxial structure ensures stable Zener voltage drift performance across this range, with typical TC of +0.05%/°C.
What is the maximum continuous power dissipation for RD18E(N)-T4?
RD18E(N)-T4 has a maximum continuous power dissipation of 500 mW at 25 °C ambient temperature, with linear derating to zero at 150 °C junction temperature. This rating applies to steady-state DC operation on FR-4 PCB with standard 1 oz copper; RD18E(N)-T4 must be mounted per SC-76 thermal pad guidelines to maintain safe junction temperatures.
Is RD18E(N)-T4 compatible with automated SMT assembly?
Yes, RD18E(N)-T4 uses the SC-76 (SSP) package with gull-wing leads and is supplied in -T4 taping format-3,000 units per reel-with standardized pocket dimensions and carrier tape specifications compliant with EIA-481-D. RD18E(N)-T4 is fully compatible with high-speed pick-and-place equipment operating at ≥25,000 cph.
What is the Zener impedance of RD18E(N)-T4 and why does it matter?
RD18E(N)-T4 exhibits a maximum Zener impedance of 40 Ω at 5 mA test current, reflecting its ability to maintain stable output voltage under changing load conditions. Lower impedance means less voltage variation for a given current shift-critical for precision references. RD18E(N)-T4's 40 Ω value ensures <200 mV deviation across a 5 mA to 15 mA load step, directly supporting tight regulation in feedback networks.
RD18E(N)-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:
- -
RD18E(N)-T4 FAQ
1.How can I place an order for RD18E(N)-T4 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD18E(N)-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 RD18E(N)-T4 reliable?
The price and inventory of RD18E(N)-T4 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)-T4 is usually 5 days.
3.What payment methods are accepted for RD18E(N)-T4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD18E(N)-T4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD18E(N)-T4?
RD18E(N)-T4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD18E(N)-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 RD18E(N)-T4?
For technical support, including RD18E(N)-T4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD18E(N)-T4 requirements.
6.How does Aetrix verify that RD18E(N)-T4 is sourced from the original manufacturer or authorized distributors?
All RD18E(N)-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 RD18E(N)-T4 meets industry standards.
7.What is the process for return or replacement of RD18E(N)-T4?
All RD18E(N)-T4 units undergo pre-shipment inspection (PSI). If there is an issue with RD18E(N)-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 RD18E(N)-T4 part is unused and in its original packaging.
Return procedure for RD18E(N)-T4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD18E(N)-T4 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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