STMicroelectronics SMP30-240

Overview

SMP30-240 from STMicroelectronics is a bidirectional Trisil™ crowbar protection device in SMA (DO-214AC) package, designed for telecom line surge protection. It features 240 V stand-off voltage (VRM), 300 V dynamic breakover voltage (VBO), 10 mA minimum holding current (IH), 10 pF typical capacitance at 50 V, and 30 A repetitive peak pulse current (10/1000 µs). It is used in xDSL line cards and central office equipment to clamp lightning-induced transients.

For engineers reviewing the SMP30-240 datasheet, SMP30-240 pinout, SMP30-240 application, or SMP30-240 equivalent, key selection criteria include verified fail-safe short-circuit behavior under surge, UL497B and UL94 V0 certification, GR-1089/ITU-T-K20/K21 compliance margins, and low-leakage performance at 216 µA max @ 216 V.

Technical Context

The SMP30-240 operates as a voltage-triggered bidirectional thyristor, entering low-impedance conduction when transient voltage exceeds its 300 V dynamic breakover threshold. Its fail-safe short-circuit mode ensures equipment remains protected even after multiple surges, with no degradation in clamping voltage or leakage.

It meets stringent telecom immunity standards including ITU-T K20 (6 kV, 10/700 µs), GR-1089 Core First Level (2.5 kV, 10/1000 µs), and FCC Part 68 Type A lightning surge (1.5 kV, 10/160 µs), enabled by its 120 °C/W junction-to-ambient thermal resistance and robust 150 °C maximum junction temperature rating.

Key Specifications

Pinout & Package

The SMP30-240 is housed in an SMA (DO-214AC) surface-mount package with two terminals: anode and cathode. The package complies with JEDEC DO-214AC mechanical dimensions, features UL94 V0 epoxy, and supports lead-free reflow soldering (260 °C, 10 s).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar crowbar protection applications.

Compared with SP1003-240 and TISP4240H3BJR-S, the SMP30-240 delivers lower capacitance for high-speed data lines, native bidirectionality without external components, and UL497B certification specific to telecom primary protection-making it optimal for new xDSL and ISDN designs requiring minimal footprint and regulatory alignment.

Availability

SMP30-240 is available at Aetrix Electronics and suitable for analog line cards, xDSL interface modules, ISDN terminal equipment, and central office line cards requiring stable component supply across multi-year telecom infrastructure deployments.

Supply support for SMP30-240 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, specializing in automotive, industrial, and power discrete solutions with broad IP and manufacturing scale.

The SMP30 series belongs to ST's Trisil™ telecom protection product line, engineered specifically for fail-safe, bidirectional surge suppression in PSTN, xDSL, and ISDN infrastructure where regulatory compliance and long-term reliability are mandatory.

FAQ

What is the fail-safe behavior of SMP30-240 under repeated surge stress?

The SMP30-240 enters a permanent short-circuit state upon catastrophic surge overload, verified per UL497B testing. This ensures downstream circuitry remains protected even after device end-of-life, unlike MOVs or TVS diodes that may degrade into high-impedance open-circuit failure modes.

Can SMP30-240 be used in AC mains protection applications?

No - SMP30-240 is rated for telecom signal-line protection only, with maximum continuous reverse voltage of 240 V and no isolation rating for 120/230 V AC mains. It lacks creepage/clearance distances and thermal derating required for direct mains connection.

How does SMP30-240 coordinate with upstream GDTs in a multi-stage protection circuit?

Its 300 V dynamic VBO is intentionally set above typical GDT spark-over (e.g., 600 V), allowing the GDT to conduct first and absorb bulk energy. The SMP30-240 then fires at lower voltage to clamp residual overshoot, with coordination ensured by series impedance matching per ITU-T K20 guidelines.

Is SMP30-240 RoHS-compliant and lead-free?

Yes - SMP30-240 is supplied in an ECOPACK®-compliant lead-free SMA package, qualified per JEDEC J-STD-020 moisture sensitivity level 1, and meets RoHS Directive 2011/65/EU with homogeneous lead content <1000 ppm.