onsemi NSPU3071N2T5G

Overview

NSPU3071N2T5G from onsemi is a unidirectional ESD and surge protection diode designed for I/O line protection in portable electronics. It features a 7.9 V working peak reverse voltage, 25 A peak pulse current (8/20 µs), clamping voltage of 9.1 V at 10 A, 175–200 pF junction capacitance, and X2DFN2 (1.0 mm × 0.6 mm) package. It protects USB VBUS/CC, microphone lines, and GPIO against ±30 kV IEC 61000−4−2 contact discharge.

For engineers reviewing the NSPU3071N2T5G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage under 8/20 µs surge, low leakage (<1 µA at 7.9 V), IEC 61000−4−2 Level 4 compliance, compact 1.0×0.6 mm footprint, and unidirectional polarity for grounded-line protection.

Technical Context

The NSPU3071N2T5G operates as a single-channel, unidirectional avalanche diode with cathode-anode configuration. Its breakdown voltage is 7.95–8.8 V at 1 mA, and it achieves 9.1 V clamping at 10 A (8/20 µs) and 9.5 V at 25 A - critical for limiting transient overvoltage on voltage-sensitive interfaces.

It meets IEC 61000−4−2 Level 4 (±30 kV contact) and IEC 61000−4−5 (25 A, 8/20 µs lightning surge), with dynamic resistance of 0.05 Ω and junction capacitance of 175–200 pF at 0 V - enabling high-speed signal integrity preservation in USB and audio paths.

Key Specifications

Pinout & Package

NSPU3071N2T5G uses the X2DFN2 (Case 714AB) surface-mount package: 1.0 mm × 0.6 mm body, 0.65 mm pitch, 0.37 mm nominal height, with exposed copper pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ESD5Z7.0T5G and SMAJ7.0A, the NSPU3071N2T5G uniquely balances 25 A surge capability, sub-200 pF capacitance, and 7.9 V working voltage - making it optimal for modern USB 2.0, analog audio, and mixed-signal I/O protection where both speed and robustness are required.

Availability

NSPU3071N2T5G is available at Aetrix Electronics and suitable for USB Type-C interface design, portable audio subsystems, industrial GPIO hardening, and consumer IoT sensor node development requiring stable component supply and guaranteed long-term sourcing.

Supply support for NSPU3071N2T5G 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 manufacturer specializing in energy-efficient power, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The NSPU3071N2T5G belongs to onsemi's ESD protection diode portfolio, engineered specifically for high-density portable electronics where board space, low capacitance, and certified IEC-level ESD immunity are mandatory design constraints.

FAQ

What is the maximum working voltage supported by the NSPU3071N2T5G?

The NSPU3071N2T5G has a working peak reverse voltage (VRWM) of 7.9 V, meaning it can continuously block up to 7.9 V DC or peak AC on protected lines without conducting. This makes it suitable for protecting 5 V and 8 V rails, including USB VBUS and microphone bias supplies. Exceeding this voltage risks premature conduction and compromised protection margin. The NSPU3071N2T5G must be applied within this limit to ensure reliable long-term operation.

Does the NSPU3071N2T5G support bidirectional ESD protection?

No, the NSPU3071N2T5G is a unidirectional ESD protection device, configured with cathode on pin 1 and anode on pin 2. It clamps only positive transients relative to ground. For bidirectional protection (e.g., differential USB data lines), two NSPU3071N2T5G devices or a dedicated bidirectional part like ESD7L5.0DT5G would be required. The NSPU3071N2T5G's unidirectional architecture optimizes clamping performance for grounded I/O lines such as VBUS and MIC_BIAS.

What is the junction capacitance of the NSPU3071N2T5G and why does it matter?

The NSPU3071N2T5G exhibits 175–200 pF junction capacitance at 0 V and 1 MHz. This value directly impacts signal integrity on high-speed or analog lines: too high capacitance attenuates bandwidth and distorts waveforms. At <200 pF, the NSPU3071N2T5G preserves USB 2.0 eye diagrams and avoids audible artifacts in microphone paths. Engineers must verify this capacitance against their interface's maximum allowable load - the NSPU3071N2T5G is validated for use in these sensitive applications.

How does the NSPU3071N2T5G perform under IEC 61000−4−5 lightning surge testing?

The NSPU3071N2T5G is rated for 25 A peak pulse current under the IEC 61000−4−5 8/20 µs waveform, with clamping voltages of 9.1 V at 10 A and 10.8 V at 25 A. This performance ensures downstream ICs see less than 11 V during worst-case lightning-induced surges - well below typical 12–16 V absolute maximum ratings. The NSPU3071N2T5G's low dynamic resistance (0.05 Ω) contributes to consistent clamping across current levels, making it suitable for industrial and automotive auxiliary port protection.

Is the NSPU3071N2T5G compatible with lead-free reflow processes?

Yes, the NSPU3071N2T5G is Pb-free, halogen-free, and RoHS-compliant, qualified for standard lead-free reflow profiles with peak temperatures up to 260 °C. Its X2DFN2 package uses matte tin terminations and is designed for compatibility with IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL1), eliminating bake requirements prior to assembly. The NSPU3071N2T5G meets all thermal and metallurgical requirements for high-yield SMT manufacturing in volume production.