STMicroelectronics ETP01-1621RL

Overview

ETP01-1621RL from STMicroelectronics is a low-capacitance transient voltage suppressor (Trisil™) for Ethernet line protection, providing differential and common-mode surge suppression with 16 V breakdown voltage, 13 pF max capacitance at 0 V, 150 A peak pulse current (2/10 µs), and SO-8 package compliance with Telcordia GR-1089 and ITU-T K20/21 standards in 10/100 Mbps Ethernet interfaces.

For engineers reviewing the ETP01-1621RL datasheet, ETP01-1621RL pinout, ETP01-1621RL application, or ETP01-1621RL equivalent, key selection criteria include verified 16 V standoff voltage, sub-13 pF I/O-to-GND capacitance, fail-safe short-circuit behavior under surge, UL94 V0 resin housing, and JEDEC SO-8 mechanical compatibility for telecom-grade Ethernet port hardening.

Technical Context

The ETP01-1621RL implements planar Trisil™ silicon technology to deliver robust bidirectional clamping without ageing degradation, enabling reliable fail-safe short-circuit operation during high-energy transients. Its design targets metallic and longitudinal surge tests per Telcordia GR-1089 Intrabuilding (150 A, 2/10 µs) and ITU-T K20/21 (40 A, 5/310 µs).

It maintains signal integrity on high-speed lines via ultra-low junction capacitance - 13 pF max between I/O and GND at 0 V bias (1 MHz), and <16 pF between I/O terminals - ensuring minimal distortion on 10/100 Mbps Ethernet differential pairs while meeting IEC 61000-4-2 Level 4 (15 kV air / 8 kV contact discharge) and IEC 61000-4-5 (4 kV, 96 A, 8/20 µs) immunity requirements.

Key Specifications

Pinout & Package

ETP01-1621RL uses a JEDEC-registered SO-8 package with gull-wing leads, UL94 V0 epoxy molding compound, and lead-free construction compliant with ECOPACK® environmental specifications. Pin 1 is marked by a beveled corner and dot; device orientation follows standard top-view layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with ETP01-2821RL, the ETP01-1621RL provides earlier clamping for 3.3 V Ethernet PHYs, while SP1003-01FTG sacrifices common-mode surge margin and channel pairing for minimal capacitance - making ETP01-1621RL the only validated solution for dual-line 10/100 Mbps port protection meeting Telcordia and ITU-T standards.

Availability

ETP01-1621RL is available at Aetrix Electronics and suitable for 10/100 Mbps Ethernet interface protection, T1/E1 line card hardening, and subscriber equipment port surge suppression requiring stable component supply across industrial, telecom, and networking OEM programs.

Supply support for ETP01-1621RL 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, power, MCU, and protection devices for industrial, automotive, and communications markets.

The ETP01 series belongs to ST's transient protection product line, engineered specifically for high-speed data line hardening in telecom infrastructure - balancing low capacitance, high surge robustness, and fail-safe reliability in JEDEC-standard packages.

FAQ

What is the maximum operating temperature range for ETP01-1621RL?

The ETP01-1621RL has an operating junction temperature range of −40 °C to +150 °C, validated per absolute ratings in ST's Doc ID 14515 Rev 4. This allows deployment in uncontrolled environments such as outdoor telecom cabinets or industrial control enclosures without derating under normal surge conditions.

Does ETP01-1621RL require external bias or control circuitry?

No. The ETP01-1621RL operates passively as a bidirectional voltage-triggered thyristor (Trisil™). It requires no external power, bias resistors, or timing components - it activates automatically when line voltage exceeds 16 V, clamping transients without signal path interruption.

Can ETP01-1621RL be used for Gigabit Ethernet (1000BASE-T) protection?

No. Its 13 pF capacitance is optimized for 10/100 Mbps signaling bandwidths. For 1000BASE-T, ST recommends the ETP02 series (e.g., ETP02-1621), which achieves ≤3 pF I/O–GND capacitance while maintaining comparable surge ratings and SO-8 compatibility.

How is the SO-8 footprint oriented for correct placement on PCB?

Pin 1 is identified by a beveled corner and a laser-marked dot adjacent to the top-left pad in top-view layout. The device must be mounted with T1 and T2 pins aligned to differential signal pairs (e.g., TX+/TX−), and both GND pins soldered to a low-impedance ground plane - as shown in Figure 6 of ST's Doc ID 14515 Rev 4.