Semtech Corporation SC196ULTRT

Overview

SC196ULTRT from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A (8/20μs) peak pulse current handling, 27.5–28V clamping voltage at 40A, and 20mΩ dynamic resistance - deployed in USB PD, USB Type-C, and industrial load switch input protection.

For engineers reviewing the SC196ULTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for minimal voltage overshoot, DFN-6 package board-space efficiency, and compatibility with 22V bus systems requiring robust surge resilience per IEC 61000-4-5.

Technical Context

The SC196ULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly shunts transient current to ground. Unlike conventional TVS diodes, its clamping voltage remains nearly constant across 24–40A peak pulse currents due to decreasing R_DS(on) under surge conditions.

It operates from –40°C to +125°C with stable 27.5–28V clamping at 40A (1.2/50μs + 8/20μs combination waveform, R_S = 2Ω), 22V reverse stand-off voltage, and 27.9V max breakdown - enabling reliable protection in thermally demanding environments without derating.

Key Specifications

Pinout & Package

SC196ULTRT is housed in a RoHS-compliant DFN-6 package measuring 1.6 mm × 1.6 mm × 0.55 mm with exposed thermal pad not required; all six terminals are functional and must be connected for full 40A surge rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Compared with TDS2211P and SP1003-02HTG, SC196ULTRT delivers identical protection performance in the same compact DFN-6 package, ensuring seamless integration into existing 22V designs without layout changes, while SP1003-02HTG requires voltage margin adjustment and PCB real estate rework.

Availability

SC196ULTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery interfaces, industrial load switch inputs, and 22V DC power rail protection requiring stable component supply, long-term lifecycle assurance, and full compliance with IEC 61000-4-2/4-4/4-5 standards.

Supply support for SC196ULTRT 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

Semtech Corporation is a U.S.-based fabless semiconductor company specializing in analog and mixed-signal ICs for precision sensing, power management, and transient protection.

The SC196ULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power and interface protection applications where clamping stability and thermal robustness are critical.

FAQ

What is the maximum continuous operating voltage for SC196ULTRT?

The SC196ULTRT has a reverse stand-off voltage (V_RWM) of 22 V, meaning it can continuously block up to 22 V on the protected line without entering conduction. This makes SC196ULTRT suitable for nominal 20–22 V systems such as USB Power Delivery buses and industrial 24 VDC rails operating within tolerance. Exceeding this voltage risks premature leakage or activation.

Does SC196ULTRT require a thermal pad on the PCB?

No, SC196ULTRT does not require an exposed thermal pad. Its DFN-6 package dissipates surge energy internally via the FET channel, and the datasheet explicitly states "no thermal pad is needed." Instead, robust grounding of all three GND pins (1, 2, 3) using multiple vias to an internal ground plane is essential to minimize parasitic inductance and ensure full 40A surge capability - a key design requirement for SC196ULTRT.

How does SC196ULTRT differ from standard TVS diodes in clamping behavior?

Unlike standard TVS diodes whose clamping voltage rises linearly with peak pulse current (V_C = V_BR + I_PP × R_DYN), SC196ULTRT uses a triggered FET architecture that maintains near-constant clamping - 27.5–28 V across 24–40A. This eliminates the need to overspecify I_PP to meet voltage thresholds, and prevents thermal drift-related clamping increase, making SC196ULTRT more predictable in real-world 22V applications.

Can SC196ULTRT be used on high-speed data lines like USB SuperSpeed?

No, SC196ULTRT is not intended for high-speed data lines. With 175 pF junction capacitance, it is optimized for 22V power rails and low-frequency I/O protection - not signal integrity-critical paths. For USB SuperSpeed (TX/RX), low-capacitance devices like RClamp3371ZC (<0.25 pF) are recommended. SC196ULTRT should be placed only on V_Bus, CC, or load switch enable lines where bandwidth is not constrained.

Is SC196ULTRT compliant with RoHS and halogen-free standards?

Yes, SC196ULTRT is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and lead finish is lead-free - confirmed in the official Semtech datasheet. This ensures suitability for environmentally regulated industrial, medical, and consumer electronics applications where material compliance is mandatory for SC196ULTRT deployment.