Analog Devices Inc. LTC4366CTS8-1#TRPBF

Overview

LTC4366CTS8-1#TRPBF from Analog Devices is a high-voltage surge stopper IC that controls an external N-channel MOSFET to regulate output voltage during overvoltage transients up to >500V, maintains 1.5A load current at 28V input, clamps output at 43V during surges, and features latch-off fault response. It enables uninterrupted operation in rugged floating topologies for industrial and avionic DC distribution systems.

For engineers reviewing the LTC4366CTS8-1#TRPBF datasheet, LTC4366CTS8-1#TRPBF pinout, LTC4366CTS8-1#TRPBF application, or LTC4366CTS8-1#TRPBF equivalent, key selection criteria include its 43V adjustable overvoltage clamp, 9-second internal cool-down timer, shutdown quiescent current <14µA, TSOT-23-8 package, and -1 variant's latched-off fault behavior after overvoltage events.

Technical Context

The LTC4366CTS8-1#TRPBF implements a floating architecture where regulation circuitry is powered from the MOSFET source (OUT pin), enabling operation with input voltages exceeding 500V. Its overvoltage regulation amplifier compares FB voltage to a 1.23V reference below OUT, driving GATE to maintain clamp accuracy.

It integrates dual shunt regulators (11.7V on VDD, 5.5V on OUT), a 9µA TIMER pin current source, and a 7.5µA start-up gate charge current from VDD. The -1 variant latches off after overvoltage fault and requires SD pin toggle to reset-unlike the auto-retry -2 version.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic TSOT-23 (3mm × 1.75mm), exposed pad optional to VSS.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar overvoltage protector applications.

Compared with LTC4366CTS8-1#TRPBF, the ITS8-1 variant offers broader thermal capability without changing design, while the CTS8-2 variant replaces latched-off safety with auto-retry-requiring careful evaluation of fault persistence risk in mission-critical systems.

Availability

LTC4366CTS8-1#TRPBF is available at Aetrix Electronics and suitable for industrial power distribution, avionic DC bus protection, and 28V vehicle system designs requiring stable component supply across long production lifecycles.

Supply support for LTC4366CTS8-1#TRPBF 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

Analog Devices (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC4366 product line is designed for high-voltage surge protection in demanding environments, targeting applications where input transients exceed 250V and uninterrupted load operation is critical.

FAQ

What is the overvoltage clamp voltage of the LTC4366CTS8-1#TRPBF?

The LTC4366CTS8-1#TRPBF does not have a fixed clamp voltage-it is adjustable via an external resistor divider on the FB pin. In the typical application shown in the datasheet, it regulates output at 43V during overvoltage transients. The clamp point is set by the ratio RFB1/RFB2 such that OUT–FB = 1.23V, allowing precise configuration from ~10V to >100V depending on resistor selection and MOSFET rating.

How does the LTC4366CTS8-1#TRPBF differ from the LTC4366CTS8-2#TRPBF?

The LTC4366CTS8-1#TRPBF latches off permanently after an overvoltage fault and requires an SD pin toggle to reset, whereas the LTC4366CTS8-2#TRPBF automatically retries after a 9-second cool-down period. Both share identical pinout, electrical specs, and package; only fault recovery behavior differs. This makes the -1 variant appropriate for safety-critical systems where unattended restart is prohibited.

What package type is used by the LTC4366CTS8-1#TRPBF?

The LTC4366CTS8-1#TRPBF uses an 8-Lead Plastic TSOT-23 package (3mm × 1.75mm) with an optional exposed pad. This compact, surface-mount package supports high-voltage isolation requirements and is compatible with standard reflow soldering processes. Pin configuration matches the standard TSOT-23 outline with VDD, SD, TIMER, VSS, GATE, OUT, FB, and BASE assigned to pins 1 through 8 respectively.

Does the LTC4366CTS8-1#TRPBF require external components to operate?

Yes-the LTC4366CTS8-1#TRPBF requires several external components: an N-channel MOSFET (e.g., IXTK90N25L2), FB resistive divider (RFB1/RFB2), TIMER capacitor, OUT bypass capacitor (≥0.22µF), VDD current-setting resistor (RIN), and voltage-dropping resistor (RSS). These enable its floating architecture, overvoltage regulation, startup sequencing, and thermal protection-no internal power switch or integrated MOSFET is included.

What is the maximum input voltage the LTC4366CTS8-1#TRPBF can handle?

The LTC4366CTS8-1#TRPBF itself has no absolute maximum input voltage rating because its internal circuitry floats with the external MOSFET source. The practical limit is determined by the voltage rating of the external N-channel MOSFET and the power-handling capability of RSS and RIN resistors. Datasheet examples demonstrate reliable operation with >500V input surges when paired with appropriately rated external components.