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Home > Products > Circuit Protection > Surge Suppression Ics

Analog Devices Inc. LT4363MPMS-1#TRPBF

Name: LT4363MPMS-1#TRPBF
Brand: Analog Devices Inc.
SKU: LT4363MPMS-1#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LT4363MPMS-1#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: Surge Suppression Ics

Package:: 12-TSSOP (0.118", 3.00mm Width)

Datasheet:: LT4363MPMS-1#TRPBF.pdf

Description:: IC SURGE STOPPER HV 12MSOP

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Product details

Overview

LT4363MPMS-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 150V, limits current via 50mV SNS–OUT sense threshold, and latches off after fault timeout. It operates from 4V to 80V input, supports –55°C to 125°C extended temperature range, and delivers precise 1.275V FB reference for adjustable clamp voltage - used in avionics power rails requiring robust transient immunity.

For engineers reviewing the LT4363MPMS-1#TRPBF datasheet, LT4363MPMS-1#TRPBF pinout, LT4363MPMS-1#TRPBF application, or LT4363MPMS-1#TRPBF equivalent, key selection criteria include latch-off behavior (LT4363-1 variant), MSOP-12 package with exposed pad grounding, –55°C military-grade temperature rating, reverse input protection to –60V, and UV/OV comparator thresholds at 1.275V with 12mV/7.5mV hysteresis.

Technical Context

The LT4363MPMS-1#TRPBF implements dual-fault protection: overvoltage regulation via feedback-controlled GATE drive maintaining 1.275V at FB, and overcurrent limiting by servoing SNS–OUT differential to 50mV (25mV when OUT < 2V). Its fault timer uses VCC–OUT voltage-dependent current sourcing to TMR pin, enabling adaptive MOSFET SOA protection across varying V_DS.

It features independent UV and OV comparators (1.275V thresholds), a shutdown pin tolerant to –60V to 100V, and ENOUT open-collector enable output latched on full MOSFET turn-on. The LT4363-1 variant latches GATE low after fault timeout and requires SHDN reset; no automatic retry occurs.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Voltage Range	4V to 80V input; enables direct use in 12V/24V/48V industrial and avionic systems without pre-regulation
Output Clamp Reference	1.275V at FB pin; sets precise adjustable output clamp via external resistor divider
Current Sense Threshold	50mV (SNS–OUT); defines overcurrent limit with ±3mV tolerance over full temperature range
Fault Timer Thresholds	TMR fault warning at 1.275V, shutdown at 1.375V, cool-down restart at 0.5V (LT4363-2 only; LT4363-1 latches)
Shutdown Current	<7µA at SHDN = 0V; ensures ultra-low quiescent power in standby mode
Temperature Range	–55°C to +125°C; qualified for extended military and aerospace applications
Reverse Input Rating	–60V on VCC/SHDN/UV/OV pins; supports reverse battery protection without external diodes

Pinout & Package

LT4363MPMS-1#TRPBF is housed in a 12-lead plastic MSOP package (4.0mm × 3.0mm × 1.1mm) with exposed thermal pad connected to GND. Pin 1 is marked by dot; pin numbering follows standard MSOP convention.

Pin/Terminal	Circuit Role	Design Meaning
GND	Device Ground Reference	Common return for internal circuitry and exposed pad connection point; must be low-impedance to PCB ground plane
TMR	Fault Timer Capacitor Node	Connects to external timing capacitor; voltage ramp determines fault warning, shutdown, and (for LT4363-2) auto-retry timing
ENOUT	Open-Collector Enable Output	Pulled high-impedance when MOSFET is fully on (V_OUT ≥ V_CC – 0.5V); latched until V_OUT drops below 2V
FLT	Open-Collector Fault Indicator	Pulls low when TMR reaches 1.275V; signals imminent MOSFET shutdown due to overvoltage or overcurrent
UV	Undervoltage Comparator Input	Threshold = 1.275V; pulls GATE low if UV falls below threshold, preventing MOSFET turn-on during brownout
FB	Feedback Input for Output Clamp Regulation	Internal 1.275V reference; connects to resistive divider from OUT to GND to set regulated clamp voltage
OUT	Output Voltage Sense Input	Senses source voltage of external N-MOSFET; V_CC–V_OUT sets fault timer current magnitude
SNS	Current Sense Input	Monitors voltage drop across external sense resistor; servoed to 50mV (or 25mV during severe short) relative to OUT
GATE	N-Channel MOSFET Gate Driver	Charge-pump driven to ~13V above OUT; clamped to 14V max; controls MOSFET conduction to regulate/clamp output
VCC	Main Supply Input	4V–80V operating range; withstands –60V reverse bias; powers internal circuitry and charge pump
SHDN	Shutdown Control Input	Active-low; threshold = 0.4V; reduces ICC to <7µA; rated –60V to 100V for rugged system integration

Key Features

Feature	Design Value
Latch-off fault response (LT4363-1)	Guarantees no automatic restart after overvoltage or overcurrent timeout - mandatory for safety-critical avionics where uncontrolled re-energization is prohibited
Adaptive fault timer with V_DS-dependent current	Charges TMR capacitor at rates scaling from ~4µA (low V_DS) to 50µA (75V V_DS), dynamically optimizing MOSFET safe operating area during transients
Reverse input protection to –60V	Enables direct connection to battery terminals without series Schottky diode - eliminates 0.3V drop and associated heat, improving efficiency and cold-cranking margin
1.275V precision FB reference	±2.5% accuracy over –55°C to 125°C allows stable, temperature-invariant output clamp setting using standard 1% resistors
Sub-5µs overcurrent turn-off propagation	t_OFF(OC) = 1µs to 2.5µs ensures rapid response to hard shorts, minimizing MOSFET energy dissipation and failure risk

Applications

Avionic Power Distribution	Industrial Hot-Swap Module
Use Scenario: Protecting flight control computers and sensors from 100V+ load dump transients in MIL-STD-704F-compliant aircraft power systems. IC Role / Device Role / Timing Role: Surge stopper regulating output to 27V during 80V surges; latching off after 100ms fault window to prevent MOSFET thermal runaway. Use Value: Enables uninterrupted operation during short transients while enforcing hard shutdown before MOSFET SOA violation - meeting DO-160 Section 22 Level 3 requirements.	Use Scenario: Safely inserting/replacing power modules in live 48V telecom racks without disrupting upstream DC-DC converters. IC Role / Device Role / Timing Role: High-side switch controlling N-MOSFET pass element; UV lockout prevents turn-on below 36V; SHDN enables controlled module enable/disable. Use Value: Eliminates inrush current and backfeed risks during insertion; –60V reverse rating protects against accidental reverse polarity connection.
Intrinsic Safety Barriers	Battery-Powered Test Equipment
Use Scenario: Isolating hazardous-area sensor interfaces in petrochemical plants per IEC 60079-11, where energy limitation is critical. IC Role / Device Role / Timing Role: Current-limiting regulator with 50mV SNS–OUT threshold; fast 1µs OC response prevents spark energy buildup in faulted circuits. Use Value: Delivers certified energy-limited output (< 100mJ) without external current-sense amplifiers - reducing BOM count and layout complexity.	Use Scenario: Powering portable oscilloscopes and multimeters from Li-ion packs subject to voltage sag and reverse polarity mishandling. IC Role / Device Role / Timing Role: Input protector with 4V–80V range covering 3S–12S battery stacks; SHDN pin tolerates –60V to prevent damage during probe misconnection. Use Value: Extends field instrument uptime by surviving accidental –48V reverse connections and 100V ESD events - eliminating costly service returns.

Avionic Power Distribution

Industrial Hot-Swap Module

Use Scenario: Protecting flight control computers and sensors from 100V+ load dump transients in MIL-STD-704F-compliant aircraft power systems.

IC Role / Device Role / Timing Role: Surge stopper regulating output to 27V during 80V surges; latching off after 100ms fault window to prevent MOSFET thermal runaway.

Use Value: Enables uninterrupted operation during short transients while enforcing hard shutdown before MOSFET SOA violation - meeting DO-160 Section 22 Level 3 requirements.

Use Scenario: Safely inserting/replacing power modules in live 48V telecom racks without disrupting upstream DC-DC converters.

IC Role / Device Role / Timing Role: High-side switch controlling N-MOSFET pass element; UV lockout prevents turn-on below 36V; SHDN enables controlled module enable/disable.

Use Value: Eliminates inrush current and backfeed risks during insertion; –60V reverse rating protects against accidental reverse polarity connection.

Intrinsic Safety Barriers

Battery-Powered Test Equipment

Use Scenario: Isolating hazardous-area sensor interfaces in petrochemical plants per IEC 60079-11, where energy limitation is critical.

IC Role / Device Role / Timing Role: Current-limiting regulator with 50mV SNS–OUT threshold; fast 1µs OC response prevents spark energy buildup in faulted circuits.

Use Value: Delivers certified energy-limited output (< 100mJ) without external current-sense amplifiers - reducing BOM count and layout complexity.

Use Scenario: Powering portable oscilloscopes and multimeters from Li-ion packs subject to voltage sag and reverse polarity mishandling.

IC Role / Device Role / Timing Role: Input protector with 4V–80V range covering 3S–12S battery stacks; SHDN pin tolerates –60V to prevent damage during probe misconnection.

Use Value: Extends field instrument uptime by surviving accidental –48V reverse connections and 100V ESD events - eliminating costly service returns.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LT4363HMS-1#TRPBF	Same functionality and pinout; rated –40°C to 125°C (vs. –55°C to 125°C for LT4363MPMS-1#TRPBF)	Qualified for automotive and industrial environments but not extended military temperature range	Select LT4363HMS-1#TRPBF if –55°C operation is unnecessary and cost optimization is prioritized.
LT4363IMS-1#TRPBF	Same functionality and pinout; rated –40°C to 85°C; lower max junction temperature than MP grade	Suitable for commercial/industrial applications without extreme thermal cycling or cold-start requirements	Choose LT4363IMS-1#TRPBF for non-military designs where qualification to –55°C is not mandated.

Compared with LT4363MPMS-1#TRPBF, LT4363HMS-1#TRPBF and LT4363IMS-1#TRPBF share identical electrical performance and fault behavior but differ in temperature qualification - making the MP grade the sole option for systems requiring guaranteed operation at –55°C ambient or storage conditions.

Availability

LT4363MPMS-1#TRPBF is available at Aetrix Electronics and suitable for avionics power distribution, intrinsic safety barriers, and battery-powered test equipment requiring stable component supply under extended temperature and high-reliability constraints.

Supply support for LT4363MPMS-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, aerospace, and communications markets.

The LT4363MPMS-1#TRPBF belongs to Analog Devices' Surge Stopper® family, engineered specifically for high-reliability power protection in harsh environments - emphasizing latch-off safety, wide input range, and extended temperature operation.

FAQ

What distinguishes LT4363MPMS-1#TRPBF from other LT4363 variants?

The LT4363MPMS-1#TRPBF is the only LT4363-1 variant offered in MSOP package with –55°C to +125°C extended temperature rating. Unlike C/I/H grades, it is qualified for military and aerospace applications requiring guaranteed operation at cryogenic ambient temperatures. Its LT4363-1 latch-off behavior ensures no automatic restart after fault timeout - a critical safety feature absent in LT4363-2 versions. All electrical specs match the LT4363 family baseline.

How does the fault timer in LT4363MPMS-1#TRPBF respond to different V_DS conditions?

The LT4363MPMS-1#TRPBF fault timer charges the TMR capacitor with current proportional to V_CC–V_OUT, ranging from ~4µA at low V_DS (≤0.5V) to 50µA at 75V V_DS. This adaptive scheme ensures shorter fault windows during high-stress transients - protecting the external MOSFET's safe operating area. For overcurrent faults, timer current is ~5× higher than overvoltage at same V_DS, enabling faster shutdown during shorts.

Can LT4363MPMS-1#TRPBF be used with back-to-back N-MOSFETs for reverse polarity protection?

Yes - the LT4363MPMS-1#TRPBF supports back-to-back N-MOSFET configurations for reverse input protection. Its VCC, SHDN, UV, and OV pins tolerate –60V, allowing direct connection to reversed battery inputs. When used with two N-MOSFETs, it eliminates the 0.3V–0.5V forward drop of Schottky diodes, improving efficiency and thermal margin in battery-powered systems without sacrificing protection integrity.

What is the role of the ENOUT pin in LT4363MPMS-1#TRPBF operation?

The ENOUT pin on LT4363MPMS-1#TRPBF is an open-collector output that goes high-impedance when the external MOSFET is fully enhanced (V_OUT ≥ V_CC – 0.5V), signaling healthy pass device conduction. It remains latched in that state until V_OUT drops below 2V - providing a reliable enable status flag for downstream power sequencing or health monitoring circuits without requiring additional logic.

How is the output clamp voltage set for LT4363MPMS-1#TRPBF?

The output clamp voltage for LT4363MPMS-1#TRPBF is set by connecting a resistive divider between the OUT and GND pins, with the center tap connected to the FB pin. Since the internal reference at FB is precisely 1.275V, the clamp voltage equals 1.275V × (1 + R1/R2), where R1 is the upper resistor (OUT to FB) and R2 is the lower resistor (FB to GND). Standard 1% resistors achieve ≤1% clamp accuracy over temperature.

LT4363MPMS-1#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Package/Case:: 12-TSSOP (0.118", 3.00mm Width)

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Clamping:: 27V Adj

Technology:: External Switch

Number of Circuits:: 1

Applications:: -

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 12-MSOP

LT4363MPMS-1#TRPBF FAQ

1.How can I place an order for LT4363MPMS-1#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LT4363MPMS-1#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LT4363MPMS-1#TRPBF reliable?

The price and inventory of LT4363MPMS-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4363MPMS-1#TRPBF is usually 5 days.

3.What payment methods are accepted for LT4363MPMS-1#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4363MPMS-1#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LT4363MPMS-1#TRPBF?

LT4363MPMS-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LT4363MPMS-1#TRPBF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LT4363MPMS-1#TRPBF?

For technical support, including LT4363MPMS-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4363MPMS-1#TRPBF requirements.

6.How does Aetrix verify that LT4363MPMS-1#TRPBF is sourced from the original manufacturer or authorized distributors?

All LT4363MPMS-1#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT4363MPMS-1#TRPBF meets industry standards.

7.What is the process for return or replacement of LT4363MPMS-1#TRPBF?

All LT4363MPMS-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4363MPMS-1#TRPBF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LT4363MPMS-1#TRPBF part is unused and in its original packaging.

Return procedure for LT4363MPMS-1#TRPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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