STMicroelectronics DSL01-008SC5

Overview

DSL01-008SC5 from STMicroelectronics is a dual-function secondary surge protection device for DSL line interfaces, integrating a Transil™ for low-energy ESD clamping (V_BR = 9.5 V min, I_BR = 1 mA) and a Trisil™ for high-energy surge short-circuiting (I_PP = 30 A, 8/20 µs), housed in SOT23-5L with 3.5 pF typical capacitance - enabling ADSL2+/VDSL signal integrity in post-transformer protection circuits.

For engineers reviewing the DSL01-008SC5 datasheet, DSL01-008SC5 pinout, DSL01-008SC5 application, or DSL01-008SC5 equivalent, key selection criteria include its 8 V stand-off voltage, differential/common-mode dual-stage topology, low capacitance vs. frequency stability, and SOT23-5L footprint compatibility with telecom line driver PCB layouts.

Technical Context

The DSL01-008SC5 implements a monolithic hybrid protection architecture: a low-capacitance Transil diode handles ESD and transient surges up to 8 kV contact discharge (IEC 61000-4-2 Level 4), while a Trisil thyristor triggers at ~11 V to short-circuit high-energy 30 A surges (IEC 61000-4-5 Level 2), preventing line driver damage without signal distortion.

This integrated dual-trigger design eliminates discrete crowbar components, achieves <±0.5 pF capacitance variation across xDSL bandwidths, and meets ITU-T K20/K21 and Telcordia GR-1089 requirements when placed after the isolation transformer on subscriber or central office DSL ports.

Key Specifications

Pinout & Package

SOT23-5L (SC-59) package with exposed pad not electrically connected; RoHS-compliant, lead-free, UL 94 V0 epoxy; dimensions: 2.8–3.0 mm × 1.5–1.75 mm × 1.1–1.2 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SP1003-008 and SLVU2.8-4, DSL01-008SC5 uniquely delivers 30 A surge capability *with* sub-4 pF capacitance in a 5-pin configuration that eliminates dedicated ground routing - making it the only option qualified for full ITU-T K21 and GR-1089 Level 2 compliance in production DSL hardware.

Availability

DSL01-008SC5 is available at Aetrix Electronics and suitable for ADSL2+ modems, VDSL2 line cards, central office DSL ports, and multi-mode xDSL gateways requiring stable component supply, long-lifecycle support, and certified surge immunity.

Supply support for DSL01-008SC5 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, MCU, power, and protection devices for industrial, automotive, and communications markets.

The DSL01 series belongs to ST's Transil™ transient protection product line, engineered specifically for broadband line interface protection where capacitance, surge margin, and topology integration are jointly constrained by xDSL standards.

FAQ

What is the function of Pin 2 on DSL01-008SC5?

Pin 2 is a no-connect (NC) terminal with no internal die connection. STMicroelectronics explicitly requires it to remain unconnected in all PCB layouts, as confirmed in Figure 6 and Section 4 of Doc ID 13179 Rev 3. Routing or soldering to Pin 2 may compromise surge performance or cause parametric drift due to parasitic coupling.

Can DSL01-008SC5 be used for primary-side DSL protection?

No - DSL01-008SC5 is designed exclusively for secondary-side (post-transformer) protection. Its 8 V stand-off voltage and 30 A surge rating assume isolation transformer attenuation upstream. Primary-side use would expose it to unattenuated lightning surges exceeding its 30 A rating and violate ITU-T K20/K21 implementation guidance in Section 2 of the datasheet.

How does DSL01-008SC5 achieve low capacitance without sacrificing surge robustness?

It uses planar monolithic integration of Transil and Trisil structures on a single silicon die, optimizing junction geometry and doping profiles to decouple capacitance (dominated by Transil junction) from surge conduction path (Trisil thyristor). This yields 3.5 pF capacitance while sustaining 30 A 8/20 µs pulses - a trade-off validated in Figure 2 and Table 2 of the official datasheet.

Is DSL01-008SC5 compatible with lead-free reflow processes?

Yes - the SOT23-5L package is lead-free and rated for peak reflow temperatures up to 260 °C for 10 seconds, meeting J-STD-020 moisture sensitivity level 1 requirements. ST specifies this in Section 4 (Package information) and Table 3 of Doc ID 13179 Rev 3, with UL 94 V0 epoxy compliance confirmed.