onsemi SZESD7462N2T5G

Overview

SZESD7462N2T5G from onsemi is a bi-directional ESD protection diode in X2DFN2 package, designed for ultra-low-capacitance RF signal line protection. It delivers 0.3 pF typical junction capacitance at 1 MHz, ±18 kV IEC 61000-4-2 contact ESD rating, and clamps to ≤34 V at ±8 A TLP, making it suitable for antenna feed lines in 5G handsets.

For engineers reviewing the SZESD7462N2T5G datasheet, pinout, applications, or equivalent options, key selection criteria include RF insertion loss (0.05 dB @ 1 GHz), voltage-dependent capacitance linearity, IEC/ISO compliance, and wettable flank compatibility - all critical for high-frequency front-end protection.

Technical Context

The SZESD7462N2T5G employs a silicon avalanche diode structure optimized for symmetric bi-directional clamping. Its low dynamic resistance (1.6 Ω) and sub-0.3 pF capacitance at 1 GHz enable minimal RF signal distortion while maintaining robust ±18 kV ESD immunity per IEC 61000-4-2.

It operates with 16 V working peak reverse voltage and 16.5–28 V breakdown voltage (IT = 1 mA), supporting DC bias conditions common in PA output and antenna switch paths. Clamping performance is validated via TLP testing (±8 A / ±16 A) and full IEC 61000-4-2 waveform capture.

Key Specifications

Pinout & Package

X2DFN2 is a 2-terminal, bottom-side wettable flank package with no internal die attach pad. Both terminals are symmetrical and functionally identical for bi-directional ESD clamping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ESD7462N2T5G and SZESD7462MXWT5G, the SZESD7462N2T5G uniquely combines AEC-Q101 qualification with standard X2DFN2 footprint - enabling drop-in use in automotive designs without layout change while meeting PPAP traceability and thermal cycling requirements.

Availability

SZESD7462N2T5G is available at Aetrix Electronics and suitable for 5G handset antenna protection, RF front-end switching, and NFC interface applications requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.

Supply support for SZESD7462N2T5G 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The SZESD7462N2T5G belongs to onsemi's Ultra-Low Capacitance ESD Protection Diode family, engineered specifically for GHz-band RF signal integrity preservation while meeting stringent IEC/ISO and AEC-Q101 standards.

FAQ

What is the maximum clamping voltage of the SZESD7462N2T5G under IEC 61000-4-2 ±8 kV contact discharge?

The SZESD7462N2T5G does not specify a single clamping voltage value for IEC 61000-4-2 ±8 kV contact discharge in its datasheet; instead, oscilloscope waveforms (Figures 7–8) show peak clamping voltages of approximately ±120 V. For design margining, the TLP-derived clamping voltage of ±34 V at ±8 A is used as the engineering-relevant limit, since it reflects steady-state clamping behavior under ESD-like current stress. The SZESD7462N2T5G achieves this with 1.6 Ω dynamic resistance.

Is the SZESD7462N2T5G suitable for protecting 5G NR n77 band (3.3–4.2 GHz) antenna lines?

Yes, the SZESD7462N2T5G is explicitly validated for 5G antenna protection: its 0.25 pF capacitance at 1 GHz scales predictably to ~0.22 pF at 3.5 GHz, and measured insertion loss is only 0.10 dB at 3 GHz. This ensures minimal VSWR degradation and preserves radiation efficiency in n77 band implementations. The SZESD7462N2T5G also maintains capacitance linearity across bias, critical for tunable antenna systems.

Does the SZESD7462N2T5G require external biasing or control signals?

No, the SZESD7462N2T5G is a passive, bi-directional avalanche diode requiring no external bias, control voltage, or enable signal. It operates automatically upon detection of overvoltage transients exceeding its 16.5 V breakdown threshold. The device remains in high-impedance state (<100 nA leakage at 16 V) during normal operation, making it fully transparent to RF signal paths. This self-contained behavior is intrinsic to the SZESD7462N2T5G's silicon structure.

What is the thermal resistance (R_θJA) of the SZESD7462N2T5G in standard FR-4 PCB layout?

The SZESD7462N2T5G has a specified thermal resistance of 400°C/W (Junction-to-Ambient) when mounted on FR-4 PCB using the recommended minimum pad size per datasheet Note 2. This value assumes no thermal vias or copper pour enhancements. Under continuous 300 mW power dissipation (absolute max), this results in ~120°C junction rise above ambient - well within its −55°C to +150°C operating range. The SZESD7462N2T5G is intended for transient, not steady-state, power handling.

How does the SZESD7462N2T5G compare to TVS diodes in terms of RF insertion loss?

The SZESD7462N2T5G achieves 0.05 dB insertion loss at 1 GHz - significantly lower than typical unidirectional TVS diodes (≥0.3 dB) and even most competing low-capacitance ESD arrays. This advantage stems from its optimized X2DFN2 geometry, minimized parasitic inductance, and absence of bond wires. At 3 GHz, the SZESD7462N2T5G maintains 0.10 dB loss, whereas conventional TVS devices often exceed 0.5 dB, directly impacting 5G NR throughput and SNR. The SZESD7462N2T5G is purpose-built for this RF-transparent requirement.