STMicroelectronics SMP100MC-140

Overview

SMP100MC-140 from STMicroelectronics is a bidirectional thyristor surge suppressor (TSS) designed for fail-safe overvoltage protection on high-speed data lines. It features a 140 V breakover voltage (VBO), 15–30 pF capacitance at 50 V, 2 µA max leakage current, 150 mA minimum holding current, and 100 A repetitive peak pulse current (10/1000 µs), enabling robust lightning and AC fault protection in ADSL2+ and telecom central office interfaces.

For engineers reviewing the SMP100MC-140 datasheet, SMP100MC-140 pinout, SMP100MC-140 application, or SMP100MC-140 equivalent, this device delivers micro-capacitance signal integrity, UL497B recognition, IEC 61000-4-5 compliance, and DO-214AA (SMB) package compatibility for telecom line card designs requiring fail-safe short-circuit behavior under surge stress.

Technical Context

The SMP100MC-140 operates as a bidirectional crowbar device that latches into low-impedance conduction upon exceeding its dynamic breakover voltage (140 V typ., 180 V max), sustaining conduction until current falls below 150 mA IH. Its micro-capacitance (30 pF max at 50 V, 60 pF max at 2 V) preserves signal fidelity on data lines up to VDSL frequencies.

It meets GR-1089 Core (first-level 2500 V/100 A), ITU-T K20/K21 (6000 V), and IEC 61000-4-5 (4000 V) surge standards without external series impedance, and enters fail-safe short-circuit mode during overstress-eliminating aging-related degradation common in MOVs or TVS diodes.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), epoxy-molded, UL94 V0 rated, lead-free plating, halogen-free resin. Dimensions: 3.30–3.95 mm length (D), 5.10–5.60 mm width (E), 1.90–2.45 mm height (A2), 0.75–1.50 mm lead length (L).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMCJ13A and P6KE150A, the SMP100MC-140 uniquely provides bidirectional crowbar action, sub-30 pF capacitance, and certified fail-safe short-circuit behavior-making it the only qualified solution for GR-1089-compliant DSL line protection.

Availability

SMP100MC-140 is available at Aetrix Electronics and suitable for ADSL2+, VDSL2, central office DSLAM, and telecom terminal equipment requiring stable component supply, long lifecycle support, and UL/IEC-certified surge protection.

Supply support for SMP100MC-140 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 automotive ICs for industrial, automotive, and communications markets.

The SMP100MC series belongs to ST's Telecom Circuit Protector product line, engineered specifically for fail-safe, low-capacitance surge suppression in high-data-rate copper-line interfaces compliant with GR-1089, ITU-T, and UL standards.

FAQ

What is the fail-safe behavior of SMP100MC-140 during sustained overvoltage?

When subjected to overvoltage exceeding its breakover threshold, the SMP100MC-140 latches into a low-impedance short-circuit state and remains conductive until line current falls below 150 mA. Unlike MOVs or TVS diodes, it does not degrade or thermally runaway-ensuring predictable, repeatable protection across its lifetime.

Can SMP100MC-140 be used in Ethernet (10/100BASE-T) protection circuits?

Yes-it is qualified for Ethernet line protection due to its ≤30 pF capacitance at 50 V, which avoids signal reflection and jitter on 100BASE-TX differential pairs. Its 140 V VBO aligns with IEEE 802.3af PoE-compatible surge thresholds, and DO-214AA footprint fits standard magnetics module layouts.

How does SMP100MC-140 differ from standard bidirectional TVS diodes?

Unlike TVS diodes that clamp and reset passively, the SMP100MC-140 acts as a thyristor-based crowbar: it triggers at 140 V, then latches on until current drops below 150 mA. This provides lower clamping voltage under high-current surges and eliminates wear-out mechanisms-critical for telecom infrastructure with frequent surge exposure.

Is a series current-limiting resistor required with SMP100MC-140 in GR-1089 Core Level 1 applications?

No-GR-1089 Core Level 1 (2500 V, 100 A, 10/1000 µs) is met without external resistance. The device's 100 A rating and low on-state voltage (<3 V at 100 A) allow direct placement across tip/ring, simplifying design and reducing bill-of-materials cost versus resistor-coupled TVS solutions.