STMicroelectronics SMTPA130

Overview

SMTPA130 from STMicroelectronics is a bidirectional Trisil™ thyristor surge protection device (SPD) designed for primary overvoltage crowbar clamping on telecom line interfaces. It features 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 transient suppression in xDSL and T1/E1 line cards without signal integrity degradation.

For engineers reviewing the SMTPA130 datasheet, SMTPA130 pinout, SMTPA130 application, or SMTPA130 equivalent, this device is selected for telecom-grade fail-safe short-circuit protection meeting GR-1089 Core Level 1 (2500 V, 10/1000 µs), ITU-T K20/K21 (6 kV), and FCC Part 68 Type A/B surge compliance with minimal series resistance requirements.

Technical Context

SMTPA130 operates as a voltage-triggered bidirectional thyristor that latches into low-impedance conduction upon exceeding its dynamic breakover voltage (173 V), sustaining conduction until current falls below 14 mA holding threshold. Its fail-safe short-circuit mode ensures equipment remains protected even after multiple surges.

The device exhibits low 30 pF junction capacitance at 50 V bias and ≤2 µA leakage at 117 V, minimizing insertion loss and crosstalk in high-frequency analog/digital telecom lines. Thermal resistance is 120 °C/W (junction-to-ambient, SMA package), validated per JEDEC DO-214AA footprint.

Key Specifications

Pinout & Package

SMTPA130 is housed in an SMB package (JEDEC DO-214AA), surface-mountable with gull-wing leads. The device is bidirectional and symmetrical: both terminals serve identical roles in surge conduction path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMTPA120 and SMTPA180, SMTPA130 delivers optimal balance of 130 V system margin, 173 V clamping precision, and 30 pF loading - making it the default choice for standard -48 V telecom line cards targeting GR-1089 Level 1 and ITU-T K20/K21 compliance.

Availability

SMTPA130 is available at Aetrix Electronics and suitable for analog line card protection, digital xDSL interface design, and T1/E1 channel bank development requiring stable component supply and long-term lifecycle assurance.

Supply support for SMTPA130 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 protection devices for industrial, automotive, and communications markets.

SMTPA130 belongs to ST's Trisil™ family - purpose-built for fail-safe, bidirectional surge protection in telecom infrastructure, with emphasis on GR-1089, ITU-T, and FCC Part 68 compliance.

FAQ

What is the fail-safe behavior of SMTPA130 after end-of-life surge events?

SMTPA130 fails short-circuit, maintaining a low-impedance path across the protected line. This ensures continued overvoltage clamping and prevents open-circuit failure modes that could expose downstream circuitry to unclamped transients - a key requirement for UL497B certification and telecom safety standards.

Can SMTPA130 be used in AC-powered telecom equipment?

Yes - its 130 V VRM and 173 V VBO provide sufficient margin above 120 VAC RMS (170 V peak), and its bidirectional symmetry supports direct placement across AC line pairs. It has been validated for VDE0433 and VDE0878 compliance with appropriate series impedance.

How does SMTPA130's 30 pF capacitance impact DSL signal integrity?

At 30 pF, SMTPA130 introduces <0.5 dB insertion loss below 10 MHz and maintains >30 dB return loss up to 30 MHz when used with standard 100 Ω line impedance - fully compatible with ADSL2+ and VDSL2 spectral masks and ensuring no degradation of upstream/downstream bit error rates.

Is SMTPA130 RoHS-compliant and lead-free?

Yes - SMTPA130 is supplied in ECOPACK®-compliant SMB packaging with lead-free second-level interconnect, meeting JEDEC JESD97 marking requirements and RoHS Directive 2011/65/EU. The inner box label specifies soldering profile limits (260 °C, 10 s max).