Renesas NNCD8.2DA-T1-AT

Overview

NNCD8.2DA-T1-AT from Renesas Electronics is an ESD noise clipping diode designed for transient voltage suppression in external interface circuits. It features a breakdown voltage of 7.73–8.67 V, dynamic impedance ≤30 Ω at 5 mA, reverse leakage ≤2 μA at 5 V, capacitance of 5.0 pF at 1 MHz, and IEC61000-4-2-rated ESD protection up to ±30 kV. It is used in USB, audio jack, and parallel interface protection on consumer electronics.

For engineers reviewing the NNCD8.2DA-T1-AT datasheet, NNCD8.2DA-T1-AT pinout, NNCD8.2DA-T1-AT application, or NNCD8.2DA-T1-AT equivalent, key selection criteria include clamping voltage margin, low capacitance for high-speed signal integrity, surge power handling (85 W), Pb-free SC-76 package compatibility, and IEC61000-4-2 compliance for system-level ESD robustness.

Technical Context

This device operates as a unidirectional Zener-type clamping diode with cathode-anode polarity, optimized for fast response to electrostatic discharge transients. Its low dynamic impedance ensures effective voltage clamping during ESD events, while its 5.0 pF capacitance minimizes signal distortion on data lines up to ~100 MHz.

The NNCD8.2DA-T1-AT is rated for 85 W non-repetitive surge reverse power (t_T = 10 μs), junction temperature up to 150°C, and storage from −55°C to +150°C. It is specified for surface mounting on 30 mm × 30 mm × 1.6 mm glass epoxy PCBs per Figure 1 in the datasheet.

Key Specifications

Pinout & Package

Package: SC-76 (2-pin Super Mini Mold), dimensions 1.7 ± 0.1 mm × 2.5 ± 0.15 mm × 1.25 ± 0.1 mm, with cathode indicated by marking on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ESD9X8.2SFT5G and TPD2E001DRYR, the NNCD8.2DA-T1-AT delivers verified ±30 kV system-level ESD immunity in a single-channel SC-76 package with balanced 5.0 pF capacitance and 30 Ω dynamic impedance-making it optimal for USB, audio, and parallel port protection where layout simplicity and certified robustness are prioritized.

Availability

NNCD8.2DA-T1-AT is available at Aetrix Electronics and suitable for USB interface protection, audio jack ESD suppression, and parallel printer port safeguarding requiring stable component supply across production lifecycles.

Supply support for NNCD8.2DA-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 in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.

The NNCD series was developed by NEC Electronics (now Renesas) specifically for IEC61000-4-2-compliant ESD protection in consumer and industrial external interface circuits, emphasizing low capacitance, repeatable clamping, and compact packaging.

FAQ

What is the maximum clamping voltage of the NNCD8.2DA-T1-AT during an ESD event?

The NNCD8.2DA-T1-AT does not specify a direct clamping voltage (V_C) value in its datasheet. However, using its 7.73–8.67 V breakdown voltage and ≤30 Ω dynamic impedance at 5 mA, the approximate clamped voltage under IEC61000-4-2 30 kV contact discharge can be estimated at <12 V. This estimation aligns with typical Zener-clamp behavior observed in the NNCD family's IT–VBR curves (Figure 2). For precise system-level validation, actual board-level testing is recommended.

Is the NNCD8.2DA-T1-AT suitable for protecting high-speed differential signals like USB 2.0?

Yes, the NNCD8.2DA-T1-AT is suitable for USB 2.0 signal line protection. Its 5.0 pF capacitance at 1 MHz introduces negligible impedance above 100 MHz, preserving signal integrity for 480 Mbps data rates. The device is intended for single-line (anode-to-signal, cathode-to-ground) placement per line, and its fast response time-implied by IEC61000-4-2 compliance-ensures effective transient suppression without affecting eye diagram margins when correctly laid out near the connector.

Does the NNCD8.2DA-T1-AT have AEC-Q200 qualification for automotive use?

No, the NNCD8.2DA-T1-AT is not AEC-Q200 qualified. Per Renesas documentation, it carries the "Standard" quality grade, intended for consumer electronics, office equipment, and industrial robots-not automotive or safety-critical systems. Its datasheet explicitly excludes transportation equipment applications. For automotive-grade ESD protection, Renesas offers separate AEC-Q200-qualified families such as the RCLAMP series, which must be selected instead of the NNCD8.2DA-T1-AT.

What is the thermal resistance and power derating behavior of the NNCD8.2DA-T1-AT?

The NNCD8.2DA-T1-AT has no published junction-to-ambient thermal resistance (R_θJA). Instead, its power dissipation is characterized via Figure 1: 200 mW at 25°C ambient, linearly derating to zero at 150°C on a 30 mm × 30 mm × 1.6 mm glass epoxy PCB. Transient thermal impedance (Figure 4) shows ~625°C/W at 1 ms, confirming suitability for short-duration ESD pulses. Continuous power handling remains limited to 200 mW under specified board conditions.

Can the NNCD8.2DA-T1-AT be used in bidirectional signal protection?

No, the NNCD8.2DA-T1-AT is a unidirectional diode-designed for cathode-to-ground configuration-and cannot protect against negative transients on lines referenced to positive rails. It conducts only when the anode voltage exceeds the cathode by ≥7.73 V. For bidirectional protection (e.g., RS-232, CAN), two NNCD8.2DA-T1-AT devices in series opposition or a dedicated bidirectional TVS like the PESD5V0S1BA would be required. Using a single NNCD8.2DA-T1-AT in such configurations risks failure during negative ESD events.