Renesas NNCD9.1C-T1-A

Overview

NNCD9.1C-T1-A from Renesas Electronics is a unidirectional electrostatic discharge (ESD) noise clipping diode in a 2-pin Ultra Super Mini Mold package, rated for 150 mW power dissipation and 30 kV IEC 1000-4-2 ESD endurance. It features a breakdown voltage of 8.53–9.58 V, dynamic impedance ≤30 Ω at 5 mA, reverse leakage ≤2 µA at 6.0 V, capacitance of 90 pF at 1 MHz, and operates from –55 °C to +150 °C. It is used for ESD protection on external interface lines such as parallel ports, CD-ROM connectors, and peripheral cables.

For engineers reviewing the NNCD9.1C-T1-A datasheet, NNCD9.1C-T1-A pinout, NNCD9.1C-T1-A application, or NNCD9.1C-T1-A equivalent, this page delivers verified electrical specs, package dimensions, real-world ESD protection performance per IEC 1000-4-2, thermal behavior under surge conditions, and direct alternatives with documented parameter differences.

Technical Context

This device functions as a clamping diode that conducts during ESD transients to limit voltage across protected signal lines. Its low dynamic impedance (≤30 Ω) ensures rapid energy shunting while maintaining low clamping voltage - critical for safeguarding CMOS inputs with tight voltage tolerances.

Designed for single-line unidirectional protection, it relies on junction breakdown rather than avalanche or TVS snapback mechanisms. Its 90 pF capacitance at 1 MHz makes it suitable for low-speed interfaces but not high-frequency data lines like USB 2.0 or HDMI.

Key Specifications

Pinout & Package

Package: 2-pin Ultra Super Mini Mold (2.1 mm × 1.3 mm × 0.75 mm), cathode marked with band.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ESD protection applications.

Compared with NNCD9.1C-T1-A, the NUP4105MR6T1G offers multi-line integration and lower capacitance but lacks voltage flexibility, while the SMAJ9.0A provides superior surge handling in a larger package - making NNCD9.1C-T1-A optimal for compact, cost-sensitive, single-line 9 V ESD protection.

Availability

NNCD9.1C-T1-A is available at Aetrix Electronics and suitable for parallel port protection, CD-ROM interface hardening, and legacy peripheral cable ESD shielding requiring stable component supply and long-term obsolescence management.

Supply support for NNCD9.1C-T1-A 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 Japanese semiconductor manufacturer formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.

The NNCD series was developed by Renesas (formerly NEC) specifically for IEC 1000-4-2-compliant ESD protection in consumer and industrial external interface circuits, emphasizing compact size, repeatable clamping, and reliability in standard-grade applications.

FAQ

What is the maximum ESD voltage rating for NNCD9.1C-T1-A?

NNCD9.1C-T1-A is rated for ≥30 kV contact discharge per IEC 1000-4-2. This value is verified under standardized test conditions (150 pF capacitor, 330 Ω series resistor) and reflects its ability to safely clamp transient energy without failure. The rating applies to single-event testing; repeated exposures may affect long-term reliability if thermal limits are exceeded. NNCD9.1C-T1-A maintains this performance within its specified ambient temperature range and mounting configuration.

Does NNCD9.1C-T1-A support bidirectional ESD protection?

No, NNCD9.1C-T1-A is a unidirectional ESD protection diode. It clamps only positive transients relative to ground (anode-to-cathode conduction). For bidirectional protection, two devices must be used in series opposition or a dedicated bidirectional part like the NUP2105 should be selected. NNCD9.1C-T1-A's design intentionally optimizes clamping behavior for single-polarity threats common in grounded-signal interfaces.

What is the thermal resistance profile of NNCD9.1C-T1-A during ESD events?

NNCD9.1C-T1-A exhibits a transient thermal impedance of 833 °C/W at t = 1 ms, dropping rapidly with shorter pulse widths. Under a 10 µs 85 W surge, junction temperature rise remains within safe limits due to its low thermal mass and ceramic PCB mounting recommendations. This behavior ensures no thermal runaway during compliant IEC 1000-4-2 pulses. NNCD9.1C-T1-A's 150 mW steady-state rating is separate from its pulsed capability.

Can NNCD9.1C-T1-A be used on 3.3 V logic lines?

No - NNCD9.1C-T1-A has a minimum breakdown voltage of 8.53 V, making it unsuitable for 3.3 V systems where clamping would occur above normal operating voltage and risk damaging downstream ICs. For 3.3 V interfaces, NNCD3.3C-T1-A (3.10–3.50 V breakdown) or similar low-voltage variants from the same family should be used. NNCD9.1C-T1-A is intended for 5 V, 9 V, or other higher-rail applications.

Is NNCD9.1C-T1-A RoHS compliant?

Yes, NNCD9.1C-T1-A complies with the EU RoHS Directive, as confirmed by Renesas Electronics' environmental compliance documentation. Lead-free soldering profiles compatible with JEDEC J-STD-020 are supported, and the device contains no restricted substances above allowable thresholds. This compliance is maintained across all manufacturing lots supplied by Renesas and distributed through authorized channels including Aetrix Electronics.