STMicroelectronics SMP100LC-25

Overview

SMP100LC-25 from STMicroelectronics is a bidirectional thyristor surge suppressor (TSS) designed for fail-safe overvoltage protection on telecom and data lines. It features a 25 V breakover voltage (V_BO), 100 A repetitive peak pulse current (10/1000 μs), ≤22 μA max leakage at 25 V, 150 mA minimum holding current (I_H), and 65 pF typical capacitance at 2 V - enabling low-distortion protection for xDSL and Ethernet interfaces.

For engineers reviewing the SMP100LC-25 datasheet, SMP100LC-25 pinout, SMP100LC-25 application, or SMP100LC-25 equivalent, key selection criteria include bidirectional crowbar behavior, UL497B recognition, IEC 61000-4-5 compliance, low capacitance for high-speed line integrity, and DO-214AA (SMB) package thermal performance.

Technical Context

The SMP100LC-25 operates as a voltage-triggered silicon-controlled rectifier (SCR) with symmetrical bidirectional conduction. Its dynamic breakover voltage is 35 V (max) and static V_BO is 25 V (min), ensuring precise clamping onset before downstream IC damage. The device latches into low-impedance conduction upon overvoltage and remains conducting until current falls below 150 mA.

It sustains 100 A surge pulses per IEC 61000-4-5 (10/1000 μs) and meets GR-1089 Core first-level requirements (2500 V, 100 A). Thermal resistance is 100 °C/W (junction-to-ambient) with recommended SMB footprint, supporting continuous operation up to +150 °C junction temperature.

Key Specifications

Pinout & Package

DO-214AA (SMB) package: molded epoxy case, lead-free plating, UL94 V0 rated, 3.3–3.95 mm width, 5.1–5.6 mm length, 1.9–2.45 mm height. Standard cathode/anode configuration with no polarity marking required due to bidirectional symmetry.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar thyristor surge suppressor applications.

Compared with SMCJ24CA and P6KE27CA, SMP100LC-25 provides intrinsic bidirectional crowbar action, guaranteed latching via 150 mA I_H, lower capacitance for high-speed lines, and direct compliance with telecom surge standards - making it uniquely suitable for xDSL/Ethernet primary protection where fail-safe short-circuit behavior is mandated.

Availability

SMP100LC-25 is available at Aetrix Electronics and suitable for telecom line card design, industrial Ethernet switch development, and DSLAM equipment manufacturing requiring stable component supply and long-term lifecycle assurance.

Supply support for SMP100LC-25 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 sensor solutions for industrial, automotive, and communications markets.

The SMP100LC series belongs to ST's Telecom Circuit Protector product line, engineered specifically to replace aging gas discharge tubes and MOVs in primary surge protection stages of high-speed wired communication infrastructure.

FAQ

What is the fail-safe behavior of SMP100LC-25 during a sustained overvoltage event?

The SMP100LC-25 enters a low-impedance latched state (short-circuit mode) when triggered, maintaining conduction until line current drops below its 150 mA minimum holding current. This prevents open-circuit failure and ensures downstream circuit disconnection via upstream fuse or breaker - a critical safety feature validated per UL497B and IEC 61000-4-5.

Can SMP100LC-25 be used on 2.5G/5G Ethernet interfaces?

Yes - its 65 pF typical capacitance at 2 V and symmetrical bidirectional response preserve signal integrity up to 100 MHz, supporting 2.5GBASE-T and 5GBASE-T applications when placed upstream of magnetics. However, system-level validation against IEEE 802.3bz is required due to frequency-dependent impedance effects not covered in the datasheet.

How does SMP100LC-25 differ from standard TVS diodes in surge handling?

Unlike TVS diodes that clamp and reset, SMP100LC-25 acts as a thyristor-based crowbar: it triggers at 25 V, latches into near-zero-voltage conduction, and stays on until current falls below 150 mA. This provides superior energy handling (100 A, 10/1000 μs) and inherent fail-safe behavior - eliminating reliance on external current limiting for sustained fault conditions.

Is the DO-214AA (SMB) package suitable for reflow soldering per J-STD-020?

Yes - the SMP100LC-25's SMB package is qualified for standard Pb-free reflow profiles, with maximum lead temperature rated at 260 °C for 10 seconds. Its thermal resistance (R_th(j-a) = 100 °C/W) assumes use of the recommended 5.84 × 2.07 mm copper footprint per Figure 14 in DS1916 Rev 15.