STMicroelectronics SMP100LC-65

Overview

SMP100LC-65 from STMicroelectronics is a bidirectional thyristor surge suppressor (TSS) designed for fail-safe overvoltage protection on telecom and data lines. It features a 65 V breakover voltage (V_BO), 45 pF capacitance at 2 V, 2 μA max leakage current, 150 mA minimum holding current (I_H), and 100 A repetitive peak pulse current (10/1000 μs). It is used in xDSL line cards to prevent signal distortion during lightning-induced surges.

For engineers reviewing the SMP100LC-65 datasheet, SMP100LC-65 pinout, SMP100LC-65 application, or SMP100LC-65 equivalent, key selection criteria include bidirectional crowbar action, low capacitance for high-speed data integrity, fail-safe short-circuit mode under overcurrent, compliance with ITU-T K20/K21 and IEC 61000-4-5, and SMB (DO-214AA) package thermal performance.

Technical Context

The SMP100LC-65 operates as a voltage-triggered silicon-controlled rectifier (SCR) that latches into low-impedance conduction upon exceeding its dynamic breakover voltage (85 V typ.), maintaining conduction until current falls below 150 mA. Its bidirectional structure enables symmetrical clamping on AC or differential data lines without polarity constraints.

It delivers robust surge immunity per GR-1089 Core (first level: 2500 V, 10/1000 μs), ITU-T K20 (6000 V, 10/700 μs), and IEC 61000-4-5 (4000 V, 10/700 μs), with thermal resistance R_th(j-a) = 100 °C/W and R_th(j-l) = 20 °C/W enabling reliable power dissipation in compact SMB footprints.

Key Specifications

Pinout & Package

SMP100LC-65 uses the SMB (DO-214AA) package: 3.3–3.95 mm width, 5.1–5.6 mm length, 1.9–2.45 mm height, with gull-wing leads and 260 °C soldering tolerance. 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 SMCJ6.0A and P6KE68CA, SMP100LC-65 uniquely combines bidirectional crowbar latching, sub-50 pF capacitance, and telecom-grade surge certifications-enabling single-device, polarity-agnostic protection on high-speed digital lines without signal integrity compromise.

Availability

SMP100LC-65 is available at Aetrix Electronics and suitable for DSL line card design, Ethernet PHY interface hardening, telecom central office equipment, and industrial RS-485 network deployment requiring stable component supply and long-term lifecycle assurance.

Supply support for SMP100LC-65 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 microcontrollers, power devices, sensors, and protection 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 IEC 61000-4-5 requirements for fail-safe, low-capacitance surge suppression on high-data-rate copper interfaces.

FAQ

What is the fail-safe behavior of SMP100LC-65 during overcurrent?

When subjected to surge currents exceeding its non-repetitive rating (e.g., 5 kA in fail-safe mode), SMP100LC-65 latches into a permanent low-resistance short circuit, physically isolating the protected circuit from further overvoltage. This behavior is intrinsic to its thyristor structure and does not require external control logic or reset mechanisms.

Does SMP100LC-65 require a series current-limiting resistor in telecom applications?

Yes-a series resistor is required to limit post-trigger current below the device's 150 mA holding threshold and prevent thermal runaway. Typical values range from 1 Ω to 10 Ω depending on line impedance and expected surge energy, as defined in GR-1089 Core test configurations.

How does SMP100LC-65 differ from standard TVS diodes in surge response?

Unlike TVS diodes that clamp and recover, SMP100LC-65 acts as a crowbar: it triggers at 85 V, then latches into near-zero voltage drop until current falls below 150 mA. This eliminates clamping voltage overshoot and provides deterministic, low-impedance fault clearing-critical for protecting sensitive PHY ICs.

Is SMP100LC-65 compatible with lead-free reflow soldering processes?

Yes-SMP100LC-65 uses lead-free plating and halogen-free molding resin, and its SMB package is rated for maximum lead temperature of 260 °C for 10 seconds, fully compliant with IPC/JEDEC J-STD-020D moisture sensitivity and lead-free reflow profiles.