STMicroelectronics SMTPA200

Overview

SMTPA200 from STMicroelectronics is a bidirectional Trisil™ surge protection device in SMB (DO-214AA) package, designed for telecom line protection with 200 V breakover voltage, 50 A (10/1000 µs) peak pulse current rating, 12 pF capacitance at 50 V, and 2 µA max leakage current. It provides fail-safe short-circuit crowbar action to protect analog/digital xDSL, T1/E1, and ISDN line cards against lightning surges per GR-1089, ITU-T K20/K21, and FCC Part 68.

For engineers reviewing the SMTPA200 datasheet, SMTPA200 pinout, SMTPA200 application, or SMTPA200 equivalent, this page delivers verified electrical parameters, JEDEC-compliant SMB package dimensions, telecom-specific surge compliance data, functional test circuit context, and validated alternatives for line-card transient protection design.

Technical Context

The SMTPA200 operates as a voltage-triggered bidirectional crowbar device: it remains high-impedance below 180 V stand-off voltage, then switches to low-impedance conduction above 262 V dynamic breakover voltage (VBO), sustaining conduction until current falls below 12 mA holding current (IH). Its fail-safe short-circuit mode ensures continued protection even after multiple surges.

Designed for telecom primary-level surge suppression, it meets GR-1089 Core First Level (2500 V / 500 A, 2/10 µs), ITU-T K20 (6000 V, 10/700 µs), and FCC Part 68 Type A (1500 V, 10/160 µs) requirements when used with appropriate series impedance-e.g., 12.5 Ω for FCC Type A compliance.

Key Specifications

Pinout & Package

SMT SMB package (JEDEC DO-214AA), 2-terminal bidirectional device with cathode/anode symmetry-no polarity marking required. Dimensions: 5.10–5.60 mm length × 3.30–3.95 mm width × 1.90–2.45 mm height; recommended PCB pad layout per Figure 13.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMTPA180 and SMTPA220, SMTPA200 offers optimal balance for 48 V DC + AC ringing telecom interfaces: its 262 V VBO provides sufficient margin above 180 V VRM while minimizing capacitance-related signal degradation-making it the preferred choice for modern xDSL and T1/E1 line cards targeting GR-1089 and ITU-T K20 compliance.

Availability

SMTPA200 is available at Aetrix Electronics and suitable for xDSL line card protection, T1/E1 interface hardening, and ISDN terminal surge suppression requiring stable component supply across multi-year telecom infrastructure programs.

Supply support for SMTPA200 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, delivering automotive, industrial, power, and analog/mixed-signal solutions with emphasis on reliability and safety certification.

The Trisil™ product line was engineered specifically for fail-safe, high-reliability surge protection in telecom infrastructure-targeting GR-1089, ITU-T, and FCC Part 68 compliance without aging-related performance drift.

FAQ

What is the fail-safe behavior of SMTPA200 during end-of-life?

When degraded by repeated surges, SMTPA200 fails short-circuit-maintaining overvoltage clamping capability and preventing open-circuit failure modes that could expose downstream ICs to unclamped transients. This behavior is certified per UL497B (file E136224) and supports safety-critical telecom applications.

Can SMTPA200 be used in DC-powered analog telephone line interfaces?

Yes-its 180 V stand-off voltage and 2 µA leakage at VRM ensure compatibility with -48 V DC bias common in POTS and VoIP line cards. The bidirectional structure handles both positive and negative ringing voltages (±170 V peak) without polarity concerns or external diode networks.

How does SMTPA200's 12 pF capacitance impact VDSL2 performance?

At 12 pF measured at 50 V bias, SMTPA200 introduces < 0.5 dB insertion loss at 30 MHz-well within VDSL2 profile 17a (up to 30 MHz) and profile 30a (up to 35 MHz) requirements. Lower capacitance than DO-15 alternatives (e.g., TPA200: 25 pF) preserves SNR margin on long loops.

What is the minimum series resistor required for FCC Part 68 Type A compliance?

A 12.5 Ω series resistor is required to meet FCC Part 68 Type A (1500 V, 10/160 µs) with SMTPA200, as specified in Table 1. This value ensures peak let-through voltage stays below 150 V during surge testing while allowing full 50 A IPP capability to be utilized.