STMicroelectronics DSL01-024SC5

Overview

DSL01-024SC5 from STMicroelectronics is a dual-stage secondary surge protection device for DSL line interfaces, combining Transil™ (low-energy clamping) and Trisil™ (high-energy short-circuit) on a single die in SOT23-5L package. It features 24 V stand-off voltage, 28 V breakdown voltage at 1 mA, 45 A peak pulse current (8/20 µs), 12 pF typical capacitance, and RoHS-compliant lead-free construction - designed specifically for ADSL2+/VDSL differential line protection after the transformer.

For engineers reviewing the DSL01-024SC5 datasheet, DSL01-024SC5 pinout, DSL01-024SC5 application, or DSL01-024SC5 equivalent, this device addresses critical trade-offs between low signal distortion (via ultra-low, voltage-stable capacitance) and robust multi-level surge immunity (IEC 61000-4-2 Level 4 ESD, IEC 61000-4-5 Level 2 surge) in telecom line driver protection circuits.

Technical Context

The DSL01-024SC5 integrates two protection mechanisms on one die: a Transil diode for fast, low-clamp-voltage response to ESD and transient surges up to ~10 A, and a Trisil thyristor that triggers into low-impedance short-circuit mode above ~28 V to divert high-energy surges (up to 30 A, 8/20 µs). This hybrid architecture avoids crowbar-style primary-side protection while maintaining signal integrity.

Its capacitance remains stable across operating voltage (ΔC typ. = 3.5 pF, measured 1 V to VRM = 24 V), enabling compliance with ITU-T K20/K21 and Telcordia GR-1089 for ADSL2+ (up to 24 Mbps) and VDSL (up to 55 Mbps) systems. Pin configuration supports differential protection topologies with defined terminal pairing (pins 1&5, 3&4) and NC pin 2.

Key Specifications

Pinout & Package

SOT23-5L (SC-59) package: surface-mount, lead-free, UL 94 V0 epoxy, 3.0 × 1.75 × 1.3 mm body, 0.95 mm pitch. Pins 1 and 5 are internally connected as one terminal; pins 3 and 4 as the second; pin 2 is not connected and must remain floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SP1003-024 and PGB102430, DSL01-024SC5 uniquely delivers monolithic dual-stage coordination with sub-4 pF capacitance delta and guaranteed 30 A surge handling - essential for VDSL2+ interoperability and transformer-secondary placement without additional protection stages.

Availability

DSL01-024SC5 is available at Aetrix Electronics and suitable for ADSL2+ modems, VDSL line cards, DSLAM ports, and multi-service access nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant surge protection.

Supply support for DSL01-024SC5 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, microcontroller, power, and protection devices for industrial, automotive, and communications markets.

The DSL01 series belongs to ST's Transil™ line protection portfolio, engineered specifically for broadband telecom interfaces where low capacitance, precise voltage coordination, and multi-standard compliance (ITU-T, Telcordia, IEC) are mandatory.

FAQ

What is the maximum operating temperature for DSL01-024SC5?

The DSL01-024SC5 has an operating junction temperature range of –40 °C to +125 °C, validated per Table 1 in ST Doc ID 13179 Rev 3. Its thermal resistance (R_thJA) is 200 °C/W on standard FR-4 with 1 cm² copper pour, enabling reliable operation in enclosed DSLAM chassis environments up to 75 °C ambient.

Can DSL01-024SC5 be used for primary-side DSL protection?

No - DSL01-024SC5 is explicitly designed for secondary-side (post-transformer) placement per ST's application guidance. Its 24 V stand-off and 28 V breakdown are incompatible with primary-side line voltages; using it there risks premature conduction and line driver disruption. Primary-side protection requires higher-voltage devices like SMBJ24A or dedicated crowbar Trisils.

How does pin 2 affect PCB layout if accidentally connected?

Pin 2 is internally unconnected and electrically isolated. If soldered to ground or signal, it introduces parasitic capacitance (~0.3 pF) and potential thermal stress during reflow, degrading high-frequency performance and risking mechanical delamination. ST's Figure 6 and Section 4.1 mandate leaving pin 2 floating with no trace or pad connection.

Is DSL01-024SC5 compliant with Telcordia GR-1089?

Yes - DSL01-024SC5 meets Telcordia GR-1089-CORE Level 2 (24 A, 8/20 µs) and Level 3 (500 A, 2/10 µs) when used in recommended differential topology with proper PCB layout (Figure 6). Its 12 pF capacitance and 30 A rating satisfy both surge and signal integrity requirements for Class B equipment per GR-1089 Section 3.5.2.