Analog Devices Inc. LTC4366MPTS8-1#TRPBF

Overview

LTC4366MPTS8-1#TRPBF from Analog Devices is a high-voltage surge stopper IC that protects downstream loads by regulating output voltage during overvoltage transients up to >500V using an external N-channel MOSFET. It features adjustable 43V output clamping, 9-second internal cool-down timer, latch-off fault response (–1 variant), and operates across –55°C to 125°C. Used in rugged 28V vehicle systems and high-voltage DC distribution.

For engineers reviewing the LTC4366MPTS8-1#TRPBF datasheet, LTC4366MPTS8-1#TRPBF pinout, LTC4366MPTS8-1#TRPBF application, or LTC4366MPTS8-1#TRPBF equivalent, key selection criteria include its –55°C to 125°C extended temperature grade, TSOT-23-8 package, latch-off behavior (vs auto-retry –2), FB regulation threshold of 1.23V, and GATE drive capability up to 12V above OUT.

Technical Context

The LTC4366MPTS8-1#TRPBF implements a floating topology where internal circuitry is powered from the MOSFET source (OUT pin), enabling operation with input surges exceeding 500V - limited only by external MOSFET and resistor ratings. Its overvoltage regulation amplifier compares FB to a 1.23V reference below OUT, controlling gate voltage to clamp output at user-defined levels.

It integrates dual shunt regulators (12V on VDD, 5.7V on OUT), a 9µA TIMER pin current source for adjustable overvoltage timing, and a 9-second internal cool-down timer after fault. The –1 variant latches off after overvoltage fault and requires SD pin toggle to reset, distinguishing it from the auto-retry –2 version.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic TSOT-23 (0.65mm pitch), exposed pad optional for thermal enhancement. Pin 1 = VDD, Pin 8 = GATE. θ_JA = 195°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4366ITS8-1#TRPBF and LTC4366HTS8-1#TRPBF, the LTC4366MPTS8-1#TRPBF uniquely supports –55°C startup and continuous operation, making it the sole choice for defense, space, and oilfield applications requiring extreme cold tolerance and latch-off safety behavior.

Availability

LTC4366MPTS8-1#TRPBF is available at Aetrix Electronics and suitable for 28V vehicle systems, avionic power distribution, and industrial high-voltage DC distribution requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC4366MPTS8-1#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.) designs precision analog, mixed-signal, and digital signal processing ICs for high-reliability applications.

The LTC4366 product line delivers high-voltage surge protection with floating architecture and configurable fault response - engineered specifically for aerospace, automotive, and industrial systems demanding robust overvoltage immunity and extended temperature operation.

FAQ

What is the key functional difference between LTC4366MPTS8-1#TRPBF and LTC4366MPTS8-2#TRPBF?

The LTC4366MPTS8-1#TRPBF features latch-off fault behavior: after an overvoltage event, it remains disabled until the SD pin is actively toggled low then high. In contrast, the LTC4366MPTS8-2#TRPBF auto-retries after a fixed 9-second cool-down period. This makes the –1 variant mandatory for safety-critical systems where uncontrolled restart could compromise integrity.

Does LTC4366MPTS8-1#TRPBF require external components to operate, and which are mandatory?

Yes - LTC4366MPTS8-1#TRPBF requires four mandatory external components: an N-channel MOSFET (e.g., IXTK90N25L2), FB resistive divider (R_FB1/R_FB2) to set clamp voltage, TIMER capacitor to define overvoltage duration, and input resistor R_IN to power start-up circuitry. Optional components include RSS (voltage-dropping resistor) and BASE-connected PNP for power reduction.

What is the maximum input voltage the LTC4366MPTS8-1#TRPBF can protect against?

The LTC4366MPTS8-1#TRPBF itself has no absolute maximum input voltage rating because its internal circuitry floats with the MOSFET source (OUT pin). Protection limit is determined by external components: MOSFET breakdown voltage (e.g., 600V), RSS resistor voltage rating, and R_FB1/R_FB2 divider power handling. Designs have successfully withstood >500V transients with appropriate component selection.

How does the floating architecture of LTC4366MPTS8-1#TRPBF improve surge protection compared to fixed-supply protectors?

Unlike fixed-supply protectors limited by their own pin voltage ratings, the LTC4366MPTS8-1#TRPBF powers its regulation circuitry from the MOSFET source (OUT pin). This allows the IC to "float" up with the input surge - so only the external MOSFET and resistors see full transient voltage. Internal circuitry remains protected behind the MOSFET, enabling >500V tolerance without custom high-voltage IC fabrication.

Is the TSOT-23 package of LTC4366MPTS8-1#TRPBF thermally adequate for high-power surge events?

The TSOT-23 package (θ_JA = 195°C/W) is sufficient for typical surge stopper operation because the LTC4366MPTS8-1#TRPBF dissipates minimal power - most heat is handled by the external MOSFET during clamping. Thermal design focuses on MOSFET heatsinking and PCB copper area under the exposed pad (optional connection to VSS improves θ_JA margin).