Semtech Corporation 1N6112A

Overview

1N6112A from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and stable 27.5–28V clamping voltage across temperature and current range. It protects USB PD, Type-C VBus, and load switch inputs in industrial and portable electronics.

For engineers reviewing the 1N6112A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under 40A surge, low dynamic resistance (20 mΩ), junction capacitance (175 pF at 22V), DFN 1.6×1.6mm package footprint, and compatibility with 22V operating bus architectures.

Technical Context

The 1N6112A employs a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant-27.5–28V-across 24A to 40A surge currents and −40°C to +125°C ambient due to decreasing R_DS(on) under stress.

It delivers 1120W peak pulse power (8/20μs), supports ±1kV IEC 61000-4-5 surge (1.2/50μs voltage + 8/20μs current, R_S = 42Ω), and maintains <600 nA reverse leakage at 22V. Its functional architecture separates trigger threshold (≈27V) from conduction path, enabling robust protection without thermal runaway or voltage drift.

Key Specifications

Pinout & Package

1N6112A is housed in a RoHS-compliant DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead package with exposed thermal pad (not electrically connected). All pins must be soldered for rated surge performance: three input pins share parallel conduction path; three ground pins provide low-inductance return.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ22A, 1N6112A delivers 3× higher surge current rating and 8V lower clamping at full stress, enabling robust protection in demanding industrial settings; compared with TDS2211P, it represents the same silicon and performance but may lack updated traceability or packaging compliance for new production runs.

Availability

1N6112A is available at Aetrix Electronics and suitable for USB Power Delivery interfaces, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle assurance, and compliance with IEC 61000-4-2/4-4/4-5 standards.

Supply support for 1N6112A 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, protection, and signal integrity.

The 1N6112A belongs to Semtech's Transient Diverting Suppressor (TDS) product line-engineered to replace conventional TVS diodes with FET-based active clamping for superior surge immunity in high-reliability power and interface protection.

FAQ

What is the working voltage rating of the 1N6112A?

The 1N6112A has a reverse stand-off voltage (V_RWM) of 22 V, meaning it reliably blocks voltages up to 22 V in normal operation while remaining non-conductive. This makes it suitable for protecting 22 V-rated power buses such as USB PD VBus lines and industrial 24 V rails with appropriate derating. The device begins clamping above 25 V (V_BR min) and maintains tight clamping at 27.5–28 V under full 40 A surge conditions.

How does the 1N6112A 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), the 1N6112A uses a surge-rated FET and precision trigger circuit to maintain near-constant clamping-27.5–28 V-from 24 A to 40 A and across −40°C to +125°C. This eliminates design uncertainty caused by temperature- and current-dependent voltage overshoot in traditional solutions.

What package type and dimensions does the 1N6112A use?

The 1N6112A is supplied in a lead-free, halogen-free DFN package measuring 1.6 mm × 1.6 mm × 0.55 mm with six terminals: pins 1–3 are GND, and pins 4–6 are IN. All six pins must be fully soldered to PCB copper for rated 40 A surge performance. The package complies with UL 94V-0 flammability and RoHS/WEEE requirements.

Can the 1N6112A be used on high-speed data lines like USB SuperSpeed or PCIe?

No-the 1N6112A is not suitable for high-speed data lines. Its junction capacitance is 175 pF at 22 V and 1 MHz, which would severely degrade signal integrity on differential pairs operating above ~10 Mbps. It is intended exclusively for DC or low-frequency power and control lines such as USB PD VBus, load switch inputs, or industrial 24 V rails-not for DP/DM, TX/RX, or CC/SBU signal paths.

Is the 1N6112A pin-compatible with the TDS2211P?

Yes-the 1N6112A and TDS2211P share identical pin configuration (GND on pins 1–3, IN on pins 4–6), electrical specifications, thermal profile, and DFN 1.6×1.6 mm package. TDS2211P is Semtech's current production part number; 1N6112A appears to be a legacy or alternate marking for the same die. Layout, schematic symbol, and PCB footprint are fully interchangeable.