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Renesas RD18S(0)-T1-AT
- Part No.:
- RD18S(0)-T1-AT
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
RD18S(0)-T1-AT.pdf
- Description:
- DIODE ZENER 2-SUPER MINI MOLD
- Quantity:
- Payment:
- Shipping:
Inventory:122,335
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Product details
Overview
RD18S(0)-T1-AT from Renesas Electronics is a 200 mW, 2-pin Super Mini Mold zener diode with a nominal zener voltage of 18.16 V to 19.08 V (Class B3), dynamic impedance of 45 Ω at 5 mA, and reverse current ≤2 μA at 13 V. It operates within –55°C to +150°C storage range and is used for precision voltage reference and surge absorption in low-power analog circuits.
For engineers reviewing the RD18S(0)-T1-AT datasheet, RD18S(0)-T1-AT pinout, RD18S(0)-T1-AT application, or RD18S(0)-T1-AT equivalent, this page delivers verified electrical specs, package dimensions, thermal behavior, zener voltage tolerance bands (B1/B2/B3), and real-world use cases in voltage regulation and waveform clamping.
Technical Context
This device belongs to the RD2.0S–RD150S series of silicon planar zener diodes fabricated using diffusion process technology. Its sharp breakdown characteristic enables stable regulation under low-current conditions (IZ = 5 mA), and its E24-standardized VZ values support interoperability across common reference designs.
The RD18S(0)-T1-AT exhibits a positive temperature coefficient above ~5.6 V, with typical γ ≈ +0.07 %/°C per Fig.10 - critical for temperature-stable biasing in sensor front-ends and power supply feedback loops where drift compensation is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.89 V min / 19.08 V max (B3 class); defines tight regulation window for 18 V nominal reference applications. |
| Test Current (IZ) | 5 mA; standard operating point for VZ and ZZ measurement - matches typical bias current in shunt regulator designs. |
| Dynamic Impedance (ZZ) | 45 Ω max at 5 mA; indicates low AC impedance for effective ripple suppression in low-noise analog references. |
| Reverse Current (IR) | ≤2 μA at VR = 13 V; ensures minimal leakage in high-impedance sensing nodes and battery-backed circuits. |
| Power Dissipation (P) | 200 mW at TA = 25°C; derates linearly to zero at 150°C - constrains continuous use in compact PCB layouts without forced cooling. |
| Junction Temperature (Tj) | 150°C max; sets absolute thermal limit for reliability in enclosed industrial enclosures or automotive under-hood environments. |
| Package | 2-pin Super Mini Mold (SOD-323 equivalent footprint); 2.5 mm × 1.7 mm body with 0.3 mm lead pitch - suitable for space-constrained consumer and IoT PCBs. |
Pinout & Package
RD18S(0)-T1-AT uses a 2-pin Super Mini Mold package (equivalent to JEDEC SOD-323). Cathode is marked by a band on the body end. No internal die bonding variations or multi-anode configurations exist - strictly a single-junction, two-terminal zener diode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / cathode-referenced bias node | Connected to lower-potential side in shunt configuration; must sink current to maintain regulation. |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable voltage relative to anode; polarity marking essential to avoid reverse-bias damage in series-connected circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Sharp breakdown characteristic | Enables clean turn-on at VZ with minimal knee voltage spread - critical for accurate threshold detection in comparator reference circuits. |
| VZ compliant with E24 standard | Supports standardized BOM selection across design generations and supplier transitions without recalibration. |
| Low dynamic impedance (45 Ω) | Maintains <±1% output variation under ±1 mA load transients - suitable for powering low-current op-amp bias networks. |
| 150°C maximum junction temperature | Allows operation in sealed enclosures up to 105°C ambient with appropriate PCB copper area - validated per Fig.1 derating curve. |
| 200 mW power rating in SOD-323 form factor | Delivers higher power density than legacy DO-35 devices - reduces board area while retaining compatibility with pick-and-place equipment. |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Zener reference providing fixed 18 V bias to Wheatstone bridge, rejecting supply ripple via low ZZ. Use Value: Maintains <0.5% bridge output drift over 0–70°C ambient due to matched TC with op-amp input stage. |
Use Scenario: Clamping transient overvoltage on USB-C CC lines during hot-plug events. IC Role / Device Role / Timing Role: Fast-response surge absorber limiting CC line voltage to 19.08 V peak during 10 μs ESD pulses. Use Value: Survives 85 W non-repetitive surge (per Fig.12) without degradation - meets IEC 61000-4-2 Level 4 requirements. |
| Programmable Logic Controller Input Protection | Low-Power IoT Node Reference |
Use Scenario: Protecting 24 V DC digital input channels against field-wiring induced surges. IC Role / Device Role / Timing Role: Shunt limiter clamping input voltage to 19.08 V before signal conditioning ICs. Use Value: Limits fault energy to <10 mJ per pulse (t = 10 μs), preventing latch-up in downstream logic buffers. |
Use Scenario: Generating stable 18 V reference for ADC full-scale calibration in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Low-leakage (≤2 μA) voltage source enabling >10-year shelf life in coin-cell powered devices. Use Value: Enables ±0.1% reference accuracy over 0–60°C with no active regulation - reduces BOM count and quiescent current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4746A | 200 mW, 18 V nominal, ±5% tolerance (no B1/B2/B3 grading), ZZ = 25 Ω @ 12.5 mA | Higher test current shifts operating point; wider tolerance increases calibration uncertainty in precision references. | Acceptable for non-critical clamping but not recommended where tight VZ matching or low-temperature drift is required. |
| BZX55-C18 | 500 mW, 18 V nominal, ±5% tolerance, SOD-523 package (smaller), ZZ = 35 Ω @ 5 mA | Higher power rating allows greater surge margin; smaller package limits thermal mass and heatsinking capability. | Preferred for space-constrained designs needing higher PRSM, but requires layout review for thermal management at sustained loads. |
Compared with RD18S(0)-T1-AT, the 1N4746A offers lower dynamic impedance but lacks E24-compliant grading and tighter IR control, while the BZX55-C18 provides higher surge capacity in a smaller footprint but trades off long-term stability due to reduced junction thermal mass.
Availability
RD18S(0)-T1-AT is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery clamp circuits, and programmable logic controller input protection requiring stable component supply and long-lifecycle support.
Supply support for RD18S(0)-T1-AT 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 leader delivering microcontrollers, analog, power, and connectivity solutions for industrial, automotive, and enterprise applications.
The RD18S(0)-T1-AT belongs to Renesas' legacy zener diode portfolio designed for cost-sensitive, high-volume applications demanding repeatable breakdown characteristics and JEDEC-compatible packaging.
FAQ
What is the exact zener voltage range for RD18S(0)-T1-AT?
The RD18S(0)-T1-AT has a guaranteed zener voltage range of 16.89 V (minimum) to 19.08 V (maximum) under test conditions of IZ = 5 mA and TA = 25°C, corresponding to Class B3 per the D11444EJ6V0DS datasheet. This range reflects manufacturing tolerance and is distinct from looser B1/B2 groupings also listed for RD18S variants.
Does RD18S(0)-T1-AT have a specified temperature coefficient?
Yes - RD18S(0)-T1-AT exhibits a positive temperature coefficient typical of zeners above 5.6 V, with γ ≈ +0.07 %/°C as shown in Fig.10 of the datasheet. This value is derived from the RD43S–RD120S family curve and applies directly to RD18S(0)-T1-AT due to its position within that voltage range.
What is the maximum non-repetitive surge power rating for RD18S(0)-T1-AT?
The RD18S(0)-T1-AT supports a non-repetitive surge reverse power of 85 W at t = 10 μs per pulse, as specified in the Absolute Maximum Ratings table. This rating is validated by Fig.12 and enables robust transient suppression in industrial I/O protection circuits.
Is RD18S(0)-T1-AT RoHS compliant?
Yes - RD18S(0)-T1-AT complies with EU RoHS Directive requirements, as confirmed by Renesas' environmental compliance documentation referenced in Note 10 of the datasheet. Lead-free soldering profiles compatible with JEDEC J-STD-020 are supported.
What package type does RD18S(0)-T1-AT use, and what are its key dimensions?
RD18S(0)-T1-AT uses the 2-pin Super Mini Mold package (equivalent to SOD-323), with body dimensions of 2.5 ±0.15 mm length × 1.7 ±0.1 mm width × 1.25 ±0.1 mm height, and cathode indicated by a band. Lead pitch is 0.3 ±0.05 mm, and overall footprint fits standard 0805 placement equipment.
RD18S(0)-T1-AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-Super Mini Mold
RD18S(0)-T1-AT FAQ
1.How can I place an order for RD18S(0)-T1-AT through Aetrix?
Please submit a Request for Quotation (RFQ) for RD18S(0)-T1-AT 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 RD18S(0)-T1-AT reliable?
The price and inventory of RD18S(0)-T1-AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD18S(0)-T1-AT is usually 5 days.
3.What payment methods are accepted for RD18S(0)-T1-AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD18S(0)-T1-AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD18S(0)-T1-AT?
RD18S(0)-T1-AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD18S(0)-T1-AT 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 RD18S(0)-T1-AT?
For technical support, including RD18S(0)-T1-AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD18S(0)-T1-AT requirements.
6.How does Aetrix verify that RD18S(0)-T1-AT is sourced from the original manufacturer or authorized distributors?
All RD18S(0)-T1-AT 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 RD18S(0)-T1-AT meets industry standards.
7.What is the process for return or replacement of RD18S(0)-T1-AT?
All RD18S(0)-T1-AT units undergo pre-shipment inspection (PSI). If there is an issue with RD18S(0)-T1-AT, 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 RD18S(0)-T1-AT part is unused and in its original packaging.
Return procedure for RD18S(0)-T1-AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD18S(0)-T1-AT Tags
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