Semtech Corporation TS32101-QFNR

Overview

TS32101-QFNR from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of single 22V I/O or power lines. It delivers ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and maintains a stable 27.5–28V clamping voltage across its full current and temperature range (−40°C to +125°C). It is used in USB Type-C PD input protection where low, temperature-invariant clamping prevents damage to downstream controllers.

For engineers reviewing the TS32101-QFNR datasheet, pinout, applications, or equivalent options, key selection criteria include its constant-clamp FET-based architecture, DFN 1.6×1.6mm 6-lead package, 22V working voltage, 175pF junction capacitance, and dynamic resistance of 20mΩ - all critical for robust industrial and portable interface protection.

Technical Context

The TS32101-QFNR employs a surge-rated MOSFET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events. Unlike conventional TVS diodes, its clamping voltage remains nearly flat (27.5–28V) from 24A to 40A due to decreasing R_DS(on) under surge conditions.

It operates with a reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V at 1mA, and exhibits only 130–600nA leakage at VRWM. Its thermal stability is confirmed across −40°C to +125°C operating range, with clamping voltage variation <0.5V over temperature - a direct result of FET-based shunt topology rather than junction-limited avalanche behavior.

Key Specifications

Pinout & Package

TS32101-QFNR is housed in a Pb-free, RoHS-compliant DFN package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads and UL 94V-0 molding compound. The package uses a thermal-pad-less design optimized for PCB-level surge dissipation via low-inductance ground vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDS2211P and SMAJ22A, TS32101-QFNR provides identical FET-based clamping performance and DFN footprint as TDS2211P but may differ in tape-and-reel packaging or date-code marking; unlike SMAJ22A, it avoids clamping voltage rise with current or temperature - critical for protecting modern 22V PD controllers.

Availability

TS32101-QFNR is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and 22V IoT power rail protection requiring stable component supply across extended temperature ranges and high-volume production cycles.

Supply support for TS32101-QFNR 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 high-performance analog and mixed-signal semiconductors for power management, protection, and signal integrity applications.

The Transient Diverting Suppressor (TDS) product line was developed to replace conventional TVS diodes in high-reliability 20–30V power and interface protection, delivering flat clamping and superior thermal stability using integrated FET-shunt architecture.

FAQ

What is the primary protection function of the TS32101-QFNR?

The TS32101-QFNR functions as a Transient Diverting Suppressor that actively shunts high-energy EOS events - including ESD, EFT, and surge - away from sensitive downstream components. It uses a precision-triggered MOSFET to clamp voltage to 27.5–28V during 40A transients, maintaining this level across −40°C to +125°C. This behavior distinguishes TS32101-QFNR from passive TVS diodes and makes it ideal for protecting 22V USB PD and industrial power rails.

Does TS32101-QFNR require external bias or control signals to operate?

No, TS32101-QFNR is fully autonomous and requires no external power, enable signals, or configuration. Its internal trigger circuit activates the shunt FET automatically when input voltage exceeds the breakdown threshold (~25–27.9V). All six pins are passive: pins 1–3 are GND, pins 4–6 are IN. This self-contained operation simplifies layout and eliminates firmware dependencies - a core design feature of the TS32101-QFNR.

How does TS32101-QFNR differ from standard TVS diodes in clamping behavior?

Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (V_C = V_BR + I_PP × R_DYN), TS32101-QFNR maintains a nearly constant 27.5–28V clamping voltage from 24A to 40A due to its FET-based architecture and decreasing R_DS(on). This eliminates thermal derating concerns and ensures predictable protection margins - a verified characteristic of TS32101-QFNR confirmed across its full operating temperature range.

Can TS32101-QFNR be used on data lines such as USB SuperSpeed or DisplayPort?

No, TS32101-QFNR is not suitable for high-speed data lines. Its 175pF junction capacitance and 22V working voltage are optimized for power rail or low-speed I/O protection (e.g., VBUS, CC, SBU, or load switch inputs), not signal integrity-critical differential pairs. For USB SS or DP lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF); TS32101-QFNR serves strictly as a power-line protector.

What PCB layout practices are required to achieve full 40A surge rating for TS32101-QFNR?

To achieve the rated 40A (8/20μs) surge capability, all three GND pins (1, 2, 3) must connect to a solid ground plane using ≥3 thermal vias each, and all three IN pins (4, 5, 6) must tie to the protected trace via a single short, wide copper run. TS32101-QFNR must be placed within 3mm of the connector entry point. Deviations - such as floating pins or long traces - reduce effective current handling and compromise clamping performance.