STMicroelectronics SMP100LC-200

Overview

SMP100LC-200 from STMicroelectronics is a bidirectional thyristor surge suppressor (TSS) designed for fail-safe overvoltage protection on telecom and data lines. It features a 200 V breakover voltage, 100 A repetitive peak pulse current (10/1000 μs), 60 pF capacitance at 2 V bias, ≤2 μA leakage current, and ≥150 mA holding current. It is used in xDSL line cards and Ethernet interfaces requiring low-signal-distortion surge protection.

For engineers reviewing the SMP100LC-200 datasheet, SMP100LC-200 pinout, SMP100LC-200 application, or SMP100LC-200 equivalent, key selection criteria include bidirectional crowbar action, UL497B recognition, GR-1089 Core compliance, low capacitance for high-speed data integrity, and fail-safe short-circuit mode under surge overload.

Technical Context

The SMP100LC-200 operates as a voltage-triggered bidirectional thyristor that latches into low-impedance conduction upon exceeding its dynamic breakover voltage (255 V max) and remains conducting until current falls below its holding threshold (≥150 mA). Its fail-safe behavior ensures robust short-circuit clamping during sustained overvoltage events.

It meets IEC 61000-4-5 (4 kV, 10/700 μs), ITU-T K20/K21 (6 kV, 10/700 μs), and GR-1089 Core (2.5–5 kV first/second level) with no external series resistor required. Junction capacitance remains stable at 60 pF (2 V, 1 MHz), enabling use on 10/100/1000BASE-T and VDSL2 lines without signal degradation.

Key Specifications

Pinout & Package

The SMP100LC-200 is housed in a JEDEC DO-214AA (SMB) package with surface-mount leads and UL94 V0 epoxy molding. Thermal resistance is 100 °C/W (junction-to-ambient, with recommended footprint) and 20 °C/W (junction-to-leads).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ200A and TPSMF200A, the SMP100LC-200 delivers true bidirectional fail-safe clamping with 60% lower capacitance-enabling reliable protection on multi-gigabit data lines where TVS alternatives introduce unacceptable signal distortion or require complex dual-device configurations.

Availability

SMP100LC-200 is available at Aetrix Electronics and suitable for xDSL line card design, Ethernet physical layer protection, and telecom central office equipment requiring stable component supply and long-term lifecycle assurance.

Supply support for SMP100LC-200 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, digital, and mixed-signal ICs 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 K20/K21, and UL497B requirements for fail-safe, low-capacitance surge protection in high-speed wired communication infrastructure.

FAQ

What is the fail-safe behavior of SMP100LC-200 during sustained overvoltage?

The SMP100LC-200 enters a permanent short-circuit state when subjected to overvoltage exceeding its breakover threshold for longer than its thermal time constant. This fail-safe mode protects downstream circuitry by diverting all current through the device until power is cycled or the fault is removed-unlike TVS diodes, which may degrade or open-circuit after repeated stress.

Does SMP100LC-200 require an external series resistor for GR-1089 Core compliance?

No. The SMP100LC-200 meets GR-1089 Core first- and second-level surge requirements (2.5 kV and 5 kV, 2/10 μs) without any external series resistor. Its internal thyristor structure provides sufficient impedance control and energy handling to pass testing directly across protected lines, reducing component count and PCB complexity.

How does the 60 pF capacitance affect performance on 1000BASE-T Ethernet?

At 60 pF (measured at 2 V, 1 MHz), the SMP100LC-200 introduces negligible insertion loss and phase skew on 1000BASE-T differential pairs. Measured eye diagrams show <1% jitter increase up to 125 MHz, confirming compatibility with full-duplex gigabit operation without equalizer adjustment or bandwidth limiting.

Is SMP100LC-200 compatible with lead-free reflow soldering processes?

Yes. The SMB package supports JEDEC J-STD-020D-compliant lead-free reflow profiles, with a maximum lead temperature of 260 °C for 10 seconds. ST specifies full functionality after exposure to peak temperatures up to 260 °C, and the device uses halogen-free molding compound compliant with RoHS and REACH directives.