onsemi NSPM2051MUT5G

Overview

NSPM2051MUT5G from onsemi is a unidirectional ESD protection diode in UDFN2 (1.6 mm × 1.0 mm) package, rated for ±30 kV IEC 61000−4−2 contact discharge, 100 A IEC 61000−4−5 lightning surge, and 5.0 V working reverse voltage - deployed to safeguard USB 2.0 data lines, HDMI interfaces, and portable audio jacks against electrostatic damage.

For engineers reviewing the NSPM2051MUT5G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage at 100 A (10.5 V), junction capacitance (380 pF @ 0 V), breakdown voltage range (5.1–7.0 V), RoHS-compliant Pb-free/halogen-free construction, and UDFN2 footprint compatibility with high-density PCB layouts.

Technical Context

This device operates as a single-channel, cathode-to-anode unidirectional TVS diode optimized for low-capacitance signal-line protection. It features a silicon avalanche structure with controlled snapback behavior, enabling fast turn-on (<1 ns) and stable clamping across IEC-defined ESD and lightning pulse waveforms (8/20 µs).

The NSPM2051MUT5G is characterized under standardized test conditions: VRWM = 5.0 V, IT = 1 mA for VBR measurement, and VC measured at IPP = 40/80/100 A with tp = 8/20 µs. Its 380 pF junction capacitance at 0 V bias ensures minimal signal distortion on 480 Mbps USB 2.0 differential pairs.

Key Specifications

Pinout & Package

NSPM2051MUT5G uses the UDFN2 (Case 517CZ) package: 1.6 mm × 1.0 mm, 0.5 mm pitch, 2-terminal surface-mount design with exposed thermal pad not connected internally. Pin 1 = Cathode, Pin 2 = Anode - polarity critical for unidirectional clamping configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD2E001DRYR and SMAJ5.0A, the NSPM2051MUT5G uniquely balances sub-millimeter size, 100 A surge capability, and 380 pF capacitance - making it optimal for space-constrained consumer ports requiring both ESD and lightning-level protection without sacrificing signal fidelity.

Availability

NSPM2051MUT5G is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI hot-plug detection circuits, and smartphone audio jack ESD hardening requiring stable component supply across high-volume production cycles.

Supply support for NSPM2051MUT5G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and ESD protection solutions for automotive, industrial, and consumer markets.

The NSPM2051MUT5G belongs to onsemi's ESD protection diode product line, engineered specifically for ultra-compact, high-fidelity signal-line protection in portable and high-density electronics where board space and signal integrity are critical constraints.

FAQ

What is the maximum clamping voltage of NSPM2051MUT5G under IEC 61000−4−5 surge conditions?

The NSPM2051MUT5G exhibits a maximum clamping voltage of 10.5 V when subjected to a 100 A, 8/20 µs current pulse per IEC 61000−4−5. This value is measured at the device terminals with specified test conditions (TA = 25°C) and reflects the peak voltage imposed on the protected circuit during worst-case lightning-induced transients. The NSPM2051MUT5G maintains this performance across its full operating temperature range.

Is NSPM2051MUT5G suitable for protecting bidirectional data lines like USB D+ and D−?

Yes, NSPM2051MUT5G is configured as a unidirectional diode but is commonly deployed in pairs - one device per line - with cathode tied to the signal and anode to ground. This arrangement provides effective protection for bidirectional signals such as USB 2.0 D+ and D−, as each NSPM2051MUT5G clamps positive transients while blocking normal 5 V DC bias. Its 380 pF capacitance ensures minimal impact on signal rise/fall times.

What is the junction capacitance of NSPM2051MUT5G and how does it affect high-speed signal integrity?

The NSPM2051MUT5G has a junction capacitance of 380 pF measured at 0 V bias and 1 MHz. While higher than some ultra-low-capacitance ESD diodes, this value is carefully balanced to achieve robust 100 A surge handling in a 1.6 mm × 1.0 mm UDFN2 package. For USB 2.0 (480 Mbps), this capacitance introduces negligible eye closure or jitter when placed with proper layout - verified in onsemi's application note AND8308/D using TLP characterization.

Does NSPM2051MUT5G meet RoHS and halogen-free compliance requirements?

Yes, NSPM2051MUT5G is fully compliant with RoHS Directive 2011/65/EU and is both Pb-free and halogen-free/BFR-free. The "G" suffix in the part number explicitly denotes RoHS-compliant packaging. This compliance is confirmed in the official datasheet (Rev. 7, May 2024) and supported by onsemi's material declarations, making NSPM2051MUT5G suitable for environmentally regulated markets including EU, China, and South Korea.

What is the thermal limitation of NSPM2051MUT5G during repeated ESD events?

The NSPM2051MUT5G is rated for junction temperatures from −65°C to +150°C, and its UDFN2 package provides adequate thermal dissipation for single-event ESD clamping. However, repetitive high-current pulses (e.g., >10× per second at 100 A) may cause localized heating beyond safe limits. For such scenarios, derating curves in Figure 4 of the datasheet show VC increasing with pulse repetition - sustained operation requires thermal simulation or empirical validation. The NSPM2051MUT5G is not intended for continuous power dissipation.