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Renesas NNCD3.9C-T1-AT
- Part No.:
- NNCD3.9C-T1-AT
- Manufacturer:
- Renesas
- Category:
- TVS Diodes
- Package:
- 2-SMD, Gull Wing
- Datasheet:
-
NNCD3.9C-T1-AT.pdf
- Description:
- NNCD3.9C-T1-AT - ELECTROSTATIC D
- Quantity:
- Payment:
- Shipping:
Inventory:9,000
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Product details
Overview
NNCD3.9C-T1-AT from Renesas Electronics is an electrostatic discharge (ESD) noise clipping diode in a 2-pin Ultra Super Mini Mold package, rated for 150 mW power dissipation, with a breakdown voltage range of 3.70–4.10 V at 5 mA, dynamic impedance ≤130 Ω, and ESD endurance ≥30 kV per IEC 1000-4-2 - used for external interface circuit protection in consumer electronics and peripheral interfaces.
For engineers reviewing the NNCD3.9C-T1-AT datasheet, NNCD3.9C-T1-AT pinout, NNCD3.9C-T1-AT application, or NNCD3.9C-T1-AT equivalent, key selection criteria include clamping voltage performance, low dynamic impedance under transient current, junction temperature limit of 150 °C, and compatibility with high-speed signal lines requiring <200 pF capacitance.
Technical Context
This device operates as a bidirectional voltage-clamping diode optimized for fast transient suppression. It achieves ESD immunity via low-breakdown-voltage Zener-like behavior and low dynamic impedance (≤130 Ω), enabling rapid energy shunting during 30 kV contact-discharge events per IEC 1000-4-2.
Its 200 pF typical capacitance at 1 MHz and 1.0 V reverse bias ensures minimal signal distortion on low-voltage data lines such as USB, audio jacks, and parallel interface connectors. The 150 mW steady-state power rating supports continuous operation within ambient temperatures up to 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 3.70–4.10 V at 5 mA - defines precise clamping threshold for 3.3 V logic interface protection. |
| Dynamic Impedance | ≤130 Ω - ensures low-voltage overshoot during fast ESD transients (e.g., IEC 1000-4-2 30 kV). |
| Capacitance | 200 pF at 1 MHz / 1.0 V - compatible with low-speed to medium-speed digital and analog signal paths. |
| ESD Withstand | ≥30 kV contact discharge - meets IEC 1000-4-2 Level 4 for robust external port protection. |
| Power Dissipation | 150 mW at TA = 25 °C - sets thermal derating envelope for PCB layout in compact consumer enclosures. |
| Junction Temperature | 150 °C maximum - constrains thermal design margin for sustained surge duty cycles. |
Pinout & Package
Package: 2-pin Ultra Super Mini Mold (USM), surface-mount, cathode-indicated marking, dimensions 2.1 × 1.3 × 0.75 mm (L × W × H), lead-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path during positive transients | Connects to protected line; conducts when voltage exceeds forward drop (~0.7 V) relative to cathode. |
| Cathode | Reference terminal for reverse-biased clamping | Typically tied to ground or common reference; enables reverse breakdown at 3.7–4.1 V to clamp overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional ESD clamping | Protects both polarities of signal lines without external biasing - ideal for unpowered or floating ports. |
| Low dynamic impedance | ≤130 Ω ensures sub-5 V clamping voltage under 1 A transient current - preserves IC input integrity. |
| Ultra-small USM package | 2.1 × 1.3 mm footprint saves board space in portable devices and dense connector areas. |
| High surge power tolerance | 85 W single-pulse (10 µs) - handles short-duration ESD events without degradation. |
Applications
| USB Peripheral Port Protection | Audio Jack ESD Suppression |
|---|---|
Use Scenario: Protecting USB 2.0 D+ and D− lines on printers, scanners, and external storage against user-handling ESD. IC Role / Device Role / Timing Role: Passive bidirectional clamping diode placed directly at connector entry point. Use Value: Prevents latch-up or gate oxide damage in USB transceivers by limiting transient voltage to ≤4.1 V. |
Use Scenario: Shielding 3.5 mm stereo headphone/mic jacks in laptops and portable media players from contact discharge. IC Role / Device Role / Timing Role: Low-capacitance shunt element across tip/ring/sleeve contacts. Use Value: Maintains audio fidelity (<200 pF) while surviving >30 kV ESD events per IEC 1000-4-2. |
| Parallel Interface Cable Protection | CD-ROM Drive Data Bus Clamping |
Use Scenario: Guarding Centronics-style printer or scanner parallel port pins against cable-induced static discharge. IC Role / Device Role / Timing Role: Discrete clamping diode per signal line (e.g., STROBE, ACK, BUSY) referenced to chassis ground. Use Value: Enables reliable handshaking under industrial handling conditions without signal delay or reflection. |
Use Scenario: Securing ATAPI/IDE data bus lines between motherboard and CD-ROM drive against insertion ESD. IC Role / Device Role / Timing Role: Point-of-entry protection on each data line (D0–D7) before buffer IC inputs. Use Value: Limits voltage excursion to safe levels (<4.1 V) during hot-plug events, preventing data corruption or controller reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NUP4105MR6T1G | Quad-channel, 5-line array; 3.3 V nominal breakdown; 12 pF typical capacitance. | Designed for multi-line protection (e.g., HDMI, SD card); lower capacitance but higher cost per channel. | Preferred when protecting ≥3 adjacent lines with tight capacitance budget (<15 pF). |
| Vishay SMAJ3.3A | Unidirectional; 3.3 V standoff; 600 W peak pulse power; DO-214AC package (larger, 4.5 × 2.7 mm). | Suited for higher-energy surges (e.g., lightning-induced); requires polarity-aware layout. | Select when system-level surge immunity exceeds IEC 1000-4-2 and board space permits larger SMC package. |
Compared with NUP4105MR6T1G and SMAJ3.3A, the NNCD3.9C-T1-AT offers optimal balance of low-cost discrete protection, 30 kV ESD rating, and USM footprint for single-line interfaces - making it ideal for cost-sensitive, space-constrained consumer peripherals where bidirectional clamping and moderate capacitance are acceptable.
Availability
NNCD3.9C-T1-AT is available at Aetrix Electronics and suitable for USB peripheral port protection, audio jack ESD suppression, and parallel interface cable protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for NNCD3.9C-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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, power, and interface solutions.
The NNCD3.9C-T1-AT belongs to Renesas' legacy ESD noise clipping diode family, designed specifically for cost-effective, board-level electromagnetic interference (EMI) suppression in consumer and office equipment interfaces.
FAQ
What is the maximum ESD voltage rating for NNCD3.9C-T1-AT?
The NNCD3.9C-T1-AT is rated for ≥30 kV contact discharge per IEC 1000-4-2 Level 4. This rating is verified under standardized test conditions (150 pF capacitor, 330 Ω series resistor) and applies to both positive and negative transients due to its bidirectional structure. The NNCD3.9C-T1-AT maintains clamping performance without degradation across its specified junction temperature range.
Does NNCD3.9C-T1-AT require external biasing to function?
No, the NNCD3.9C-T1-AT operates as a passive, bidirectional clamping device and requires no external bias or control signals. Its symmetrical Zener-like structure enables automatic conduction during overvoltage events on either terminal relative to the other. The NNCD3.9C-T1-AT functions reliably whether the protected line is powered, unpowered, or floating.
What is the thermal derating behavior of NNCD3.9C-T1-AT above 25 °C?
The NNCD3.9C-T1-AT has a linear thermal derating curve: power dissipation decreases from 150 mW at 25 °C to zero at 125 °C ambient, based on Fig. 1 in the datasheet. At 85 °C ambient, the allowable steady-state power drops to approximately 90 mW. This derating must be applied when estimating long-term reliability in enclosed consumer enclosures.
Can NNCD3.9C-T1-AT be used on 5 V logic lines?
The NNCD3.9C-T1-AT is not recommended for direct use on 5 V logic lines because its 3.7–4.1 V breakdown voltage risks premature conduction during normal 5 V operation. For 5 V interfaces, NNCD5.1C-T1-AT (4.82–5.39 V breakdown) or NNCD5.6C-T1-AT (5.29–5.94 V) are appropriate alternatives. The NNCD3.9C-T1-AT is strictly intended for 3.3 V systems or lower-voltage analog paths.
Is NNCD3.9C-T1-AT RoHS compliant and lead-free?
Yes, the NNCD3.9C-T1-AT is RoHS compliant and manufactured with lead-free terminations, consistent with Renesas Electronics' environmental policy and EU Directive 2011/65/EU. The "T1" suffix denotes tape-and-reel packaging compatible with standard SMT assembly processes, and the USM package uses SnAgCu solder-compatible metallization.
NNCD3.9C-T1-AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 2-SMD, Gull Wing
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 10V (Max)
- Voltage - Breakdown (Min):
- 3.7V
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 85W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1pF @ 1MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-Ultra Super Mini Mold
NNCD3.9C-T1-AT FAQ
1.How can I place an order for NNCD3.9C-T1-AT through Aetrix?
Please submit a Request for Quotation (RFQ) for NNCD3.9C-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 NNCD3.9C-T1-AT reliable?
The price and inventory of NNCD3.9C-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 NNCD3.9C-T1-AT is usually 5 days.
3.What payment methods are accepted for NNCD3.9C-T1-AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NNCD3.9C-T1-AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NNCD3.9C-T1-AT?
NNCD3.9C-T1-AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NNCD3.9C-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 NNCD3.9C-T1-AT?
For technical support, including NNCD3.9C-T1-AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NNCD3.9C-T1-AT requirements.
6.How does Aetrix verify that NNCD3.9C-T1-AT is sourced from the original manufacturer or authorized distributors?
All NNCD3.9C-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 NNCD3.9C-T1-AT meets industry standards.
7.What is the process for return or replacement of NNCD3.9C-T1-AT?
All NNCD3.9C-T1-AT units undergo pre-shipment inspection (PSI). If there is an issue with NNCD3.9C-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 NNCD3.9C-T1-AT part is unused and in its original packaging.
Return procedure for NNCD3.9C-T1-AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NNCD3.9C-T1-AT Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
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Diodes Incorporated
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Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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