Renesas NNCD5.1D-T1-AT

Overview

NNCD5.1D-T1-AT from Renesas Electronics is a 2-pin ESD noise clipping diode in Super Mini Mold package, rated for 200 mW power dissipation, with breakdown voltage 4.82–5.39 V (at 5 mA), dynamic impedance ≤130 Ω, and ESD endurance ≥30 kV per IEC 1000-4-2. It protects external interface circuits such as parallel printer ports and CD-ROM connectors against electrostatic discharge.

For engineers reviewing the NNCD5.1D-T1-AT datasheet, NNCD5.1D-T1-AT pinout, NNCD5.1D-T1-AT application, or NNCD5.1D-T1-AT equivalent, key selection criteria include clamping voltage under surge, junction capacitance (160 pF at 1.5 V), reverse leakage (<5 µA at 1.5 V), thermal resistance, and compatibility with 2-pin SMD layout for high-density PCBs.

Technical Context

This device operates as a bidirectional transient voltage suppressor optimized for low-capacitance ESD protection on signal lines. Its silicon PN-junction structure enables fast response to sub-nanosecond ESD events while maintaining low leakage and stable breakdown threshold across temperature.

The NNCD5.1D-T1-AT is designed for single-line protection in unidirectional or bidirectional configurations, with cathode-indicated polarity and specified surge reverse power of 85 W (10 µs pulse). It does not integrate steering diodes or series resistors - external circuit design must provide current limiting where required.

Key Specifications

Pinout & Package

Package: 2-pin Super Mini Mold (SMD), dimensions 2.5 × 1.25 × 0.9 mm (L × W × H), cathode marked by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSQA5.0AVS and SMAJ5.0A, the NNCD5.1D-T1-AT delivers optimal balance of low-cost, compact 2-pin SMD form factor, 160 pF capacitance, and proven 30 kV ESD performance for legacy parallel interfaces - making it the preferred choice where space, cost, and ESD-only immunity are primary constraints.

Availability

NNCD5.1D-T1-AT is available at Aetrix Electronics and suitable for parallel printer interface protection, CD-ROM data bus clamping, industrial keypad ESD guard, and legacy game console peripheral port applications requiring stable component supply and long-term obsolescence management.

Supply support for NNCD5.1D-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 Japanese semiconductor manufacturer formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.

The NNCD5.1D-T1-AT belongs to Renesas' legacy ESD noise clipping diode family, designed specifically for cost-sensitive, space-constrained external interface protection in Standard-grade consumer and industrial equipment.

FAQ

What is the maximum ESD voltage the NNCD5.1D-T1-AT can withstand?

The NNCD5.1D-T1-AT is rated for ≥30 kV contact discharge per IEC 1000-4-2, verified under standardized test conditions (150 pF capacitor, 330 Ω series resistor). This rating applies to single-pulse events at room temperature; repetitive ESD stress may reduce effective lifetime. The NNCD5.1D-T1-AT achieves this via low dynamic impedance and robust junction design, ensuring reliable clamping without degradation in typical interface applications.

Does the NNCD5.1D-T1-AT have polarity, and how is it identified?

Yes, the NNCD5.1D-T1-AT is a polarized diode with cathode indicated by a visible band on the package body. The cathode must be connected to ground (or reference potential) for proper unidirectional clamping; reversing polarity compromises ESD protection effectiveness. This marking aligns with JEDEC-standard 2-pin SMD diode orientation, and the NNCD5.1D-T1-AT datasheet confirms cathode-band placement per package drawing.

What is the junction capacitance of the NNCD5.1D-T1-AT, and at what bias is it measured?

The NNCD5.1D-T1-AT exhibits 160 pF typical junction capacitance measured at 1.5 V reverse bias and 1 MHz frequency. This value is critical for preserving signal integrity on low-speed parallel buses (e.g., printer, IDE); higher capacitance would distort edges and increase crosstalk. The NNCD5.1D-T1-AT's 160 pF is confirmed in the "Electrical Characteristics" table of its official Renesas datasheet (Doc. No. D11772EJ2V0DS00).

Can the NNCD5.1D-T1-AT be used in bidirectional signal lines without additional components?

No - the NNCD5.1D-T1-AT is a single unidirectional diode. For true bidirectional ESD protection on AC-coupled or differential lines, two NNCD5.1D-T1-AT devices must be placed in series opposition (anode-to-anode or cathode-to-cathode), or a dedicated bidirectional TVS array should be selected. Using one NNCD5.1D-T1-AT alone only protects against transients of one polarity relative to ground.

Is the NNCD5.1D-T1-AT RoHS compliant and lead-free?

Yes, the NNCD5.1D-T1-AT complies with EU RoHS Directive 2011/65/EU and is lead-free. Renesas confirms RoHS compliance for this product family in environmental documentation (e.g., "Renesas Environmental Compliance Report"), and the NNCD5.1D-T1-AT is manufactured using Pb-free solderable terminations and halogen-free molding compound, consistent with industry-standard green initiatives.