STMicroelectronics SMP100LC-8

Overview

SMP100LC-8 from STMicroelectronics is a bidirectional thyristor surge suppressor (TSS) designed for fail-safe overvoltage protection on telecom and data lines. It features 8 V breakover voltage, 100 A repetitive peak pulse current (10/1000 μs), 2 μA max leakage current at 6 V, 75 pF capacitance at 2 V, and holds in short-circuit mode with ≥150 mA holding current - enabling robust lightning and AC fault protection in xDSL line cards.

For engineers reviewing the SMP100LC-8 datasheet, SMP100LC-8 pinout, SMP100LC-8 application, or SMP100LC-8 equivalent, key selection criteria include bidirectional crowbar behavior, low 75 pF capacitance for high-speed signal integrity, UL497B recognition, GR-1089 Core compliance, and SMB (DO-214AA) package thermal performance under surge stress.

Technical Context

The SMP100LC-8 operates as a voltage-triggered silicon-controlled rectifier (SCR) with symmetrical bidirectional conduction. Its dynamic breakover voltage is 8 V (max), static breakover is 25 V (max), and it latches into low-impedance conduction once triggered - maintaining short-circuit state until current falls below 150 mA holding threshold.

It meets IEC 61000-4-5 (4 kV, 10/700 μs), ITU-T K20/K21 (6 kV), and GR-1089 Core first-level (2.5 kV, 2/10 μs) surge immunity requirements. Thermal resistance is 100 °C/W (junction-to-ambient) with recommended footprint, supporting sustained operation up to +150 °C junction temperature.

Key Specifications

Pinout & Package

SMP100LC-8 uses the SMB (DO-214AA) surface-mount package: 3.3–3.95 mm length, 5.1–5.6 mm width, 1.9–2.45 mm height, with gull-wing leads and center cathode/anode symmetry for bidirectional operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SM100LC-8, SMP100LC-8 offers slightly higher capacitance but ST's validated GR-1089 Core compliance and UL497B recognition; versus P6SMB8.0A, it provides guaranteed fail-safe shutdown instead of passive clamping - critical for telecom infrastructure safety mandates.

Availability

SMP100LC-8 is available at Aetrix Electronics and suitable for xDSL line cards, telecom central office interfaces, and industrial Ethernet switches requiring stable component supply, long lifecycle support, and certified surge protection.

Supply support for SMP100LC-8 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, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and communications markets.

The SMP100LC series belongs to ST's Telecom Circuit Protector product line, engineered specifically to meet GR-1089, ITU-T K-series, and IEC 61000-4-x surge immunity standards for carrier-grade wired infrastructure.

FAQ

What is the fail-safe behavior of SMP100LC-8 during a surge event?

The SMP100LC-8 enters a latched low-impedance state (short circuit) once triggered and remains conductive until current drops below its 150 mA minimum holding current. This fail-safe mode ensures continuous protection until upstream circuit protection (e.g., fuse or breaker) clears the fault - a requirement for UL60950 and GR-1089 compliance.

Does SMP100LC-8 require a gate drive or external control circuit?

No. The SMP100LC-8 is a two-terminal, self-triggering thyristor surge suppressor with no gate terminal. It relies solely on voltage-dependent breakover characteristics - dynamic V_BO ≤ 8 V initiates conduction without auxiliary components, simplifying PCB layout and reducing BOM count.

How does the 75 pF capacitance impact high-speed data line performance?

At 75 pF (measured at 2 V, 1 MHz), the SMP100LC-8 introduces negligible impedance above 10 MHz, preserving eye diagram integrity on ADSL2+ (up to 2.2 MHz baseband) and VDSL2 (up to 17 MHz). Its low capacitance avoids signal attenuation and timing skew compared to higher-capacitance MOVs or unidirectional TVS devices.

Can SMP100LC-8 be used in AC mains input protection?

No. The SMP100LC-8 is rated for signal/data line protection only (≤400 V standoff), not AC mains. Its 8 V breakover voltage and 150 mA holding current make it unsuitable for 120/230 VAC applications. For AC input, ST recommends dedicated AC-rated TSS devices such as the SMAJ series or dedicated relay-based crowbar circuits.