STMicroelectronics HSP051-4M5

Overview

HSP051-4M5 from STMicroelectronics is a 4-channel ESD protection array with rail-to-rail architecture, designed for high-speed differential lines including HDMI 2.1 (12 Gbps), USB4 (20 Gbps), and DisplayPort. It features 11.5 GHz differential-mode cutoff frequency, 0.35 pF I/O-to-GND capacitance at 2.5–9 GHz, ±20 kV contact/±30 kV air IEC 61000-4-2 ESD rating, and operates from –40 °C to +150 °C junction temperature.

For engineers reviewing the HSP051-4M5 datasheet, HSP051-4M5 pinout, HSP051-4M5 application, or HSP051-4M5 equivalent, key selection criteria include differential bandwidth compatibility with 12 Gbps HDMI 2.1 eye integrity, ultra-low capacitive loading on high-speed lanes, clamping voltage under 13.7 V at 16 A TLP, and μQFN-5L package suitability for dense PCB layouts with 500 µm pitch.

Technical Context

The HSP051-4M5 implements a symmetric rail-to-rail diode architecture across four independent I/O channels, enabling bidirectional ESD clamping without DC bias dependency. Its low dynamic resistance (0.35 Ω I/O-to-GND, 0.45 Ω GND-to-I/O) ensures rapid voltage suppression during sub-nanosecond transients.

Designed specifically for differential signaling pairs, it maintains signal integrity via tightly controlled differential-mode capacitance (0.20–0.30 pF at 2.5–9 GHz) and preserves impedance matching-TDR measurements show differential impedance deviation within 85–100 Ω when integrated into HDMI 2.1 trace paths.

Key Specifications

Pinout & Package

The HSP051-4M5 is housed in a μQFN-5L package measuring 1.3 mm × 0.8 mm with 500 µm pitch and exposed thermal pad. The package complies with ECOPACK environmental standards and supports reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD4E05U06DQAR and SZESD7371MUTAG, the HSP051-4M5 delivers superior 12 Gbps HDMI 2.1 compatibility through its 11.5 GHz bandwidth and lowest-in-class 0.35 pF I/O-to-GND capacitance, while integrating all four protection channels in a single 1.3 mm × 0.8 mm μQFN-5L package - reducing BOM count and layout complexity.

Availability

HSP051-4M5 is available at Aetrix Electronics and suitable for HDMI 2.1 video transmission, USB4 docking infrastructure, and industrial DisplayPort interface designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for HSP051-4M5 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

The HSP051-4M5 belongs to ST's high-speed ESD protection product line, engineered specifically to preserve signal integrity in multi-gigabit serial interfaces while meeting stringent IEC 61000-4-2 immunity requirements.

FAQ

What is the maximum recommended trace length between HSP051-4M5 and the protected connector?

ST recommends placing the HSP051-4M5 within 3 mm of the HDMI/USB4 connector pad to minimize inductance in the ESD current path. Longer traces increase clamping voltage overshoot - measured TLP data shows >15% V_CL rise with 5 mm trace length due to series inductance exceeding 0.8 nH/mm.

Does HSP051-4M5 require external bias or control signals?

No. The HSP051-4M5 uses a passive rail-to-rail diode architecture with no external bias, enable, or configuration pins. It operates autonomously across its full –40 °C to +150 °C range and draws zero quiescent current - ideal for always-on high-speed interfaces.

Can HSP051-4M5 protect AC-coupled differential lines?

Yes. Its rail-to-rail structure provides symmetrical clamping regardless of DC common-mode voltage. Tested with HDMI 2.1 AC-coupled TMDS lanes (0 V common-mode), it maintains <13.7 V clamping at 16 A TLP and does not introduce DC offset or baseline wander.

How does HSP051-4M5 compare to discrete TVS diodes in high-speed applications?

Unlike discrete unidirectional TVS diodes, the HSP051-4M5's integrated 4-channel rail-to-rail design eliminates inter-channel timing skew and reduces total parasitic capacitance by 40% versus four discrete 0402 devices - validated by S21 attenuation and eye diagram measurements in DS11462 Figures 3–14.