STMicroelectronics DSL01-010SC5

Overview

DSL01-010SC5 from STMicroelectronics is a dual-stage secondary surge protection device for DSL line interfaces, integrating a Transil™ for low-energy ESD clamping and a Trisil™ for high-energy 30 A (8/20 µs) surge short-circuiting. It features 10.5 V stand-off voltage, 3.5 pF typical capacitance, and operates in SOT23-5L package. Used after the line transformer in ADSL2+/VDSL modems to meet ITU-T K21 and GR-1089 requirements.

For engineers reviewing the DSL01-010SC5 datasheet, DSL01-010SC5 pinout, DSL01-010SC5 application, or DSL01-010SC5 equivalent, key selection criteria include low-signal-disturbance clamping behavior, differential/common-mode protection topology compatibility, surge current rating versus line driver survivability, and strict capacitance stability across xDSL frequency bands.

Technical Context

The DSL01-010SC5 implements monolithic dual-die integration of avalanche diode (Transil) and thyristor (Trisil) structures on a single chip, enabling coordinated response: Transil clamps transients ≤12 V without triggering line driver shutdown, while Trisil latches at ≥25 V to divert >30 A surges. This architecture avoids crowbar-induced line disruption common with discrete Trisil-only solutions.

Its planar silicon process ensures stable 3.5 pF capacitance from 1 V to 10.5 V bias (1 MHz), critical for preserving ADSL2+ (up to 2.2 MHz) and VDSL (up to 12 MHz) signal integrity. Pin configuration supports differential protection topologies with internal pairing of terminals 1–5 and 3–4, isolating unused pin 2.

Key Specifications

Pinout & Package

SOT23-5L (SC-59) surface-mount package with lead-free, RoHS-compliant epoxy meeting UL 94 V0; footprint optimized for minimal parasitic inductance in high-frequency line protection layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SP1003-010 and SM712, DSL01-010SC5 uniquely delivers monolithic dual-stage response with sub-4 pF capacitance and guaranteed 30 A surge handling-enabling single-component compliance with modern VDSL2 and G.fast line interface standards without external coordination components.

Availability

DSL01-010SC5 is available at Aetrix Electronics and suitable for ADSL2+ modems, VDSL line cards, DSLAM port modules, and multi-service access nodes requiring stable component supply and long-term lifecycle support.

Supply support for DSL01-010SC5 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and communications markets.

The DSL01 series belongs to ST's Transil™ transient protection product line, engineered specifically for broadband line interface protection where low capacitance, precise voltage thresholds, and coordinated dual-stage surge response are mandatory.

FAQ

What is the function of pin 2 on the DSL01-010SC5?

Pin 2 is a no-connect (NC) terminal per STMicroelectronics datasheet Doc ID 13179 Rev 3. It corresponds to an electrically isolated die pad with no internal connection to active structures. Leaving it unconnected prevents parasitic coupling, thermal stress, or unintended current paths that could compromise surge response consistency or long-term reliability.

Can DSL01-010SC5 be used for primary-side DSL protection?

No. The DSL01-010SC5 is explicitly designed for secondary-side placement after the line transformer, as stated in Section 2 of its datasheet. Primary-side use would expose it to unattenuated surge energy exceeding its 30 A rating and violate its specified application topology, risking catastrophic failure and loss of protection integrity.

How does the 3.5 pF capacitance impact VDSL2 signal integrity?

The 3.5 pF capacitance is measured between pins 1–5 and 3–4 at 1 MHz and remains stable across the 1–10.5 V bias range. This ensures insertion loss <0.1 dB and group delay variation <0.5 ns up to 12 MHz, directly supporting VDSL2 Annex M and G.fast profiles without equalization overhead or SNR degradation.

Is DSL01-010SC5 compliant with Telecordia GR-1089?

Yes. Per datasheet Section 2 and Application Information page 3/8, the DSL01 series meets GR-1089 requirements for secondary protection when implemented post-transformer. Its 30 A (8/20 µs) rating exceeds GR-1089 Level 2 (24 A), and its low capacitance avoids violating the standard's insertion loss and return loss specifications across the full xDSL band.