STMicroelectronics SMP50-130

Overview

SMP50-130 from STMicroelectronics is a bidirectional Trisil™ thyristor surge protection device designed for primary overvoltage clamping on telecom line interfaces. It features a 130 V standoff voltage (VRM), 173 V dynamic breakover voltage (VBO), 14 mA minimum holding current (IH), 50 A repetitive peak pulse current (10/1000 µs), and 30 pF capacitance at 50 V - enabling robust lightning and transient suppression in xDSL and T1/E1 line cards without signal integrity degradation.

For engineers reviewing the SMP50-130 datasheet, SMP50-130 pinout, SMP50-130 application, or SMP50-130 equivalent, this device is selected for fail-safe short-circuit crowbar behavior, UL497B and GR-1089 compliance, low leakage (<2 µA), and JEDEC DO-214AC (SMA) surface-mount packaging - critical for telecom surge protection layout and reliability validation.

Technical Context

The SMP50-130 operates as a voltage-triggered bidirectional thyristor, entering low-impedance conduction when transient voltage exceeds its 173 V dynamic breakover threshold. Its fail-safe short-circuit mode ensures continued protection even after end-of-life stress events.

It delivers 50 A peak pulse handling per 10/1000 µs waveform with thermal resistance of 120 °C/W (junction-to-ambient, SMA package) and maintains stable VBO across junction temperature (±10% variation from –40°C to 125°C), supporting operation in uncontrolled telecom cabinet environments.

Key Specifications

Pinout & Package

SMP50-130 is housed in an SMA (DO-214AC) plastic package with cathode-anode symmetry optimized for bidirectional line protection. The package meets UL94 V0 flammability rating and supports 260 °C lead-free soldering (10 s).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional telecom surge protection applications.

Compared with SP1003-010 and V130LA20AP, SMP50-130 uniquely combines bidirectional symmetry, deterministic fail-safe behavior, low 30 pF capacitance, and zero aging - making it the preferred choice for long-lifetime, signal-integrity-critical telecom line interfaces.

Availability

SMP50-130 is available at Aetrix Electronics and suitable for DSL line cards, T1/E1 interface modules, ISDN terminals, and central office line cards requiring stable component supply, long-term lifecycle support, and certified surge protection performance.

Supply support for SMP50-130 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, with design and manufacturing operations across Europe, Asia, and the Americas.

The Trisil™ product line was developed specifically for fail-safe, high-reliability overvoltage protection in telecom infrastructure - emphasizing UL497B certification, GR-1089 compliance, and long-term parameter stability under repeated surge stress.

FAQ

What is the fail-safe behavior of SMP50-130 during end-of-life?

The SMP50-130 enters a permanent short-circuit state when degraded by repeated surges, ensuring downstream circuitry remains protected instead of exposed to unclamped transients. This behavior is intrinsic to its thyristor structure and verified per UL497B test protocol E136224, eliminating risk of open-circuit failure in safety-critical telecom deployments.

Can SMP50-130 be used in AC mains protection applications?

No - SMP50-130 is rated for telecom signal-line protection only, with a 130 V standoff voltage and thermal limits unsuitable for 120/230 VAC mains. Its 120 °C/W junction-to-ambient resistance and lack of VDE/IEC61000-4-5 Level 4 certification preclude use in power-line surge protection; dedicated MOVs or GDTs are required instead.

How does SMP50-130 differ from standard TVS diodes in telecom protection?

Unlike avalanche TVS diodes, SMP50-130 uses thyristor-based crowbar action with defined holding current (14 mA min) and fail-safe shorting. It offers lower capacitance (30 pF vs. typical 60–100 pF), no wear-out mechanism, and superior GR-1089 Level 1 surge handling (50 A vs. 30–40 A for same package), making it ideal for high-density, long-lifecycle line cards.

Is SMP50-130 compatible with lead-free reflow processes?

Yes - SMP50-130's SMA package is qualified for lead-free soldering at 260 °C for 10 seconds, meeting JEDEC J-STD-020 moisture sensitivity level 1 and RoHS Directive 2011/65/EU. Its UL94 V0 epoxy housing remains dimensionally stable and electrically intact through standard Pb-free reflow profiles including peak temperatures up to 260 °C.