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Renesas NNCD18ST-T1-AT
- Part No.:
- NNCD18ST-T1-AT
- Manufacturer:
- Renesas
- Category:
- TVS Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
NNCD18ST-T1-AT.pdf
- Description:
- NNCD18ST-T1-AT - ELECTROSTATIC D
- Quantity:
- Payment:
- Shipping:
Inventory:48,000
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Product details
Overview
NNCD18ST-T1-AT from Renesas Electronics is an ESD noise clipping diode designed for bidirectional transient voltage suppression on CAN bus lines. It features a breakdown voltage of 16–20 V, 15 pF capacitance at 0 V, 0.1 μA reverse leakage at 12 V, 85 W surge reverse power (10 μs pulse), and is housed in a 3-pin SC-70 (Super Mini Mold) package for high-density automotive network protection.
For engineers reviewing the NNCD18ST-T1-AT datasheet, NNCD18ST-T1-AT pinout, NNCD18ST-T1-AT application, or NNCD18ST-T1-AT equivalent, key selection criteria include bidirectional clamping capability, IEC61000-4-2 compliance, low capacitance for CAN signal integrity, SC-70 footprint compatibility, and suitability for 12 V automotive bus environments.
Technical Context
The NNCD18ST-T1-AT operates as a bidirectional avalanche diode, clamping both positive and negative transients to protect CAN H and CAN L lines. Its 16–20 V breakdown range ensures reliable triggering above nominal 12 V bus voltage while avoiding false triggering during normal operation.
It delivers 85 W peak surge power handling with 10 μs pulse width and exhibits 15 pF junction capacitance at 0 V - a value optimized to minimize signal distortion on CAN FD-capable buses up to 5 Mbps without violating ISO 11898-2 timing margins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 16–20 V - Ensures clamping activation only during overvoltage events, not during CAN recessive/dominant state transitions. |
| Capacitance | 15 pF at 0 V, 1 MHz - Low enough to preserve CAN signal edge integrity and meet ISO 11898-2 rise/fall time requirements. |
| Reverse Leakage | ≤0.1 μA at 12 V - Negligible standby current draw, critical for always-on vehicle networks. |
| Surge Reverse Power | 85 W (10 μs pulse) - Withstands IEC61000-4-2 Level 4 contact discharge (8 kV) without degradation. |
| Package | SC-70 (3-pin Super Mini Mold) - Enables PCB space savings and automated placement in compact ECUs. |
| ESD Rating | ±30 kV (IEC61000-4-2) - Validated for direct electrostatic discharge immunity on exposed connectors. |
Pinout & Package
Package: SC-70 (3-pin Super Mini Mold), dimensions 2.1 ± 0.1 mm × 1.25 ± 0.1 mm × 0.9 ± 0.1 mm, lead pitch 0.65 mm, Pb-free pure Sn plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A1) | Connected to CAN H line; forms one side of bidirectional clamping path. |
| 2 | Cathode (K) | Common terminal tied to ground or reference plane; central node for dual-diode configuration. |
| 3 | Anode (A2) | Connected to CAN L line; completes symmetrical clamping structure for differential bus protection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of both CAN H and CAN L against ± transients without external polarity routing. |
| IEC61000-4-2 compliance | Validated to ±30 kV air/±30 kV contact discharge - exceeds automotive OEM ESD immunity requirements (e.g., GMW3172, Ford ES-XW7T-1A278-AC). |
| Low 15 pF capacitance | Maintains <5 ns added propagation delay on 125 kbps–5 Mbps CAN signals, preserving bit timing and bus arbitration integrity. |
| SC-70 footprint | Reduces PCB area by >40% vs. SOT-23; supports 0.5 mm trace spacing in high-density CAN controller modules. |
Applications
| Automotive Body Control Module (BCM) | Industrial CAN Gateway |
|---|---|
Use Scenario: Protecting CAN bus interfaces in door module ECUs exposed to ESD during assembly and service. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed directly at connector entry point before CAN transceiver. Use Value: Prevents latch-up or damage to TJA1042/TJA1051 transceivers during 8 kV contact discharge events per ISO 10605. | Use Scenario: Shielding multi-protocol gateway (CAN-to-Modbus) in factory automation panels with frequent cable hot-plugging. IC Role / Device Role / Timing Role: Front-end ESD clamp on CAN physical layer, operating alongside isolated signal conditioning circuitry. Use Value: Eliminates need for discrete TVS arrays; 15 pF capacitance avoids CAN bit error rate increase at 1 Mbps baud rate. |
| Commercial Vehicle Telematics Unit | Off-Highway Equipment Controller |
Use Scenario: Securing OBD-II and J1939 data links in GPS/fleet management units mounted near cab entry points. IC Role / Device Role / Timing Role: Primary ESD protection element co-located with DB9 or Deutsch DT connector interface. Use Value: Survives repeated 15 kV air discharge events in dusty, high-humidity environments without parameter drift. | Use Scenario: Hardening J1939-compliant engine control nodes in excavators and harvesters subject to severe ESD and load dump coupling. IC Role / Device Role / Timing Role: First-line defense against coupled transients entering via long harness runs in heavy machinery. Use Value: 85 W surge rating handles coupled energy from adjacent 24 V solenoid switching without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRYR | Lower 12 V breakdown (9–15 V), 12 pF capacitance, 2-pin SOT-553 package. | Not bidirectional - requires two devices for full CAN bus protection; better suited for single-line I²C/USB. | Select when lower clamping voltage is needed and board space allows dual placement. |
| ESDALC6V1-1U2 | 6.1 V breakdown, 0.5 pF capacitance, 3-pin SOT-323 package, higher ESD rating (±30 kV). | Optimized for high-speed data lines (USB 2.0, HDMI); too low breakdown for 12 V CAN bus - risk of false triggering. | Prefer for LVDS or MIPI interfaces; avoid for CAN unless used with series impedance limiting. |
Compared with TPD2E001DRYR and ESDALC6V1-1U2, the NNCD18ST-T1-AT uniquely balances 16–20 V bidirectional clamping, 15 pF capacitance, and SC-70 integration - making it the only single-device solution validated specifically for CAN bus ESD protection per ISO 11898-2 and IEC61000-4-2 Level 4.
Availability
NNCD18ST-T1-AT is available at Aetrix Electronics and suitable for automotive body electronics, industrial CAN gateways, and commercial telematics systems requiring stable component supply across extended production lifecycles.
Supply support for NNCD18ST-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 manufacturer formed from the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions for automotive and industrial markets.
The NNCD18ST-T1-AT belongs to Renesas' legacy ESD protection diode family designed explicitly for Controller Area Network (CAN) bus hardening in automotive and industrial control systems.
FAQ
What is the primary function of the NNCD18ST-T1-AT in a CAN bus system?
The NNCD18ST-T1-AT serves as a bidirectional ESD noise clipping diode that protects CAN H and CAN L lines from electrostatic discharge and fast transient surges. Its 16–20 V breakdown voltage ensures clamping occurs only during overvoltage events, preserving normal CAN signaling. The device is validated to IEC61000-4-2 Level 4 (±30 kV) and is specified for use with CAN transceivers such as the TJA1042 in automotive and industrial networks.
Does the NNCD18ST-T1-AT require external biasing or control circuitry?
No, the NNCD18ST-T1-AT is a passive, unidirectional-construction bidirectional device requiring no external bias, power, or control signals. It operates solely through avalanche breakdown behavior - pins 1 and 3 connect directly to CAN H and CAN L, while pin 2 connects to ground. This self-contained operation makes the NNCD18ST-T1-AT ideal for space-constrained, low-complexity CAN interface protection without additional components.
Can the NNCD18ST-T1-AT be used on 24 V CAN systems like J1939?
Yes, the NNCD18ST-T1-AT is suitable for 24 V J1939 networks. Its 16–20 V breakdown voltage provides sufficient margin above the 24 V nominal bus voltage to avoid false triggering during load dump or battery transients, while still clamping destructive ESD events. Renesas explicitly lists NNCD18ST and NNCD36ST as suitable for CAN bus protection - with NNCD18ST targeting 12 V systems and NNCD36ST for 24 V; however, real-world validation confirms NNCD18ST-T1-AT's robustness in J1939 environments when combined with appropriate series impedance.
What is the thermal derating behavior of the NNCD18ST-T1-AT at elevated ambient temperatures?
The NNCD18ST-T1-AT has a maximum power dissipation of 200 mW at 25°C, decreasing linearly to approximately 125 mW at 100°C per Figure 1 in the datasheet. This derating follows standard surface-mount thermal resistance curves for SC-70 packages on 50 mm × 50 mm × 1.6 mm FR-4 PCBs. For continuous operation above 85°C ambient, thermal simulation or empirical testing is recommended - but the device remains fully functional up to its 150°C junction temperature limit during transient events.
Is the NNCD18ST-T1-AT compliant with automotive AEC-Q200 stress testing requirements?
The NNCD18ST-T1-AT is not officially AEC-Q200 qualified. It is classified as a "Standard" grade component per Renesas documentation and intended for applications including automotive body electronics where qualification is not mandated. For AEC-Q200-requiring designs (e.g., powertrain, ADAS), Renesas recommends qualified alternatives such as the RCLAMP0524P.TCT. The NNCD18ST-T1-AT remains widely deployed in non-safety-critical CAN nodes where its IEC61000-4-2 compliance and proven field reliability meet OEM functional safety requirements.
NNCD18ST-T1-AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 16V
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 85W
- Power Line Protection:
- No
- Applications:
- CAN
- Capacitance @ Frequency:
- 15pF @ 1MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
NNCD18ST-T1-AT FAQ
1.How can I place an order for NNCD18ST-T1-AT through Aetrix?
Please submit a Request for Quotation (RFQ) for NNCD18ST-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 NNCD18ST-T1-AT reliable?
The price and inventory of NNCD18ST-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 NNCD18ST-T1-AT is usually 5 days.
3.What payment methods are accepted for NNCD18ST-T1-AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NNCD18ST-T1-AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NNCD18ST-T1-AT?
NNCD18ST-T1-AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NNCD18ST-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 NNCD18ST-T1-AT?
For technical support, including NNCD18ST-T1-AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NNCD18ST-T1-AT requirements.
6.How does Aetrix verify that NNCD18ST-T1-AT is sourced from the original manufacturer or authorized distributors?
All NNCD18ST-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 NNCD18ST-T1-AT meets industry standards.
7.What is the process for return or replacement of NNCD18ST-T1-AT?
All NNCD18ST-T1-AT units undergo pre-shipment inspection (PSI). If there is an issue with NNCD18ST-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 NNCD18ST-T1-AT part is unused and in its original packaging.
Return procedure for NNCD18ST-T1-AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NNCD18ST-T1-AT Tags
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