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Home > Products > Circuit Protection > Surge Suppression Ics

Analog Devices Inc. LT4356IS-3#TRPBF

Name: LT4356IS-3#TRPBF
Brand: Analog Devices Inc.
SKU: LT4356IS-3#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LT4356IS-3#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: Surge Suppression Ics

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: LT4356IS-3#TRPBF.pdf

Description:: IC SURGE STOPPER ADJ 16-SOIC

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Product details

Overview

LT4356IS-3#TRPBF from Analog Devices is a surge protection controller IC that regulates output voltage during automotive load dump and other high-voltage transients by driving an external N-channel MOSFET. It features adjustable 1.25V feedback clamping, 50mV overcurrent sense threshold, −60V to 100V SHDN tolerance, and AEC-Q100 qualification for automotive use in battery-powered systems.

For engineers reviewing the LT4356IS-3#TRPBF datasheet, LT4356IS-3#TRPBF pinout, LT4356IS-3#TRPBF application, or LT4356IS-3#TRPBF equivalent, key selection criteria include its 4V–80V operating range, fault-latchoff timer with inverse V_DS-dependent current, reverse input protection capability, and SO-16 package compatibility with industrial and automotive power rail conditioning designs.

Technical Context

The LT4356IS-3#TRPBF implements dual-fault protection using independent voltage and current amplifiers: the FB amplifier servo-regulates GATE to hold V_OUT at 1.25V × (1 + R1/R2) during overvoltage, while the SNS amplifier limits ΔV_SNS = V_CC − V_SNS to 50mV during overcurrent. Both faults charge the TMR capacitor with V_DS-scaled current-2µA to 50µA for overvoltage, 4µA to 260µA for overcurrent-to enforce MOSFET safe operating area compliance.

Its shutdown architecture latches GATE low after fault timeout and requires SHDN <0.4V for ≥100µs followed by >2.1V transition at >10V/ms to reset. The auxiliary amplifier (AOUT/IN+) supports linear regulator control or comparator functions with internal 1.25V reference, and EN provides open-collector MOSFET-on status indication with hysteresis-based latching.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Voltage Range	4V to 80V - enables operation during automotive cold-crank (≥4V) and withstands 80V load dump transients.
Overvoltage Clamp Threshold	1.25V at FB pin - sets output clamp voltage via external resistor divider; enables precise, adjustable regulation (e.g., 27V).
Overcurrent Sense Threshold	50mV across sense resistor - defines current limit as I_LIM = 50mV / R_SENSE; ensures fast response without external gain stages.
Fault Timer Current Scaling	2–50µA (OV), 4–260µA (OC) vs V_DS - dynamically shortens fault timeout under high stress, protecting MOSFET SOA.
Shutdown Quiescent Current	<7µA - reduces system standby power; SHDN tolerates −60V to 100V, enabling direct connection to harsh battery rails.
Package & Temp Range	16-pin SO, −40°C to +85°C - industrial/automotive grade; exposed pad optional; AEC-Q100 qualified (I-grade).
GATE Drive Capability	Pull-down: 150mA (OV), 10mA (OC); pull-up: charge pump - ensures robust MOSFET turn-on/off under wide V_CC and load conditions.

Pinout & Package

LT4356IS-3#TRPBF is housed in a 16-lead plastic SO package (SO-16), with pin 1 at top-left corner when notch is oriented up. The exposed pad is not present in SO packaging. Pin functions are electrically identical to DFN and MSOP variants but mapped to SO-16 layout.

Pin/Terminal	Circuit Role	Design Meaning
1 TMR	Fault timer capacitor node	Charged by V_DS-scaled current during OV/OC; 1.25V threshold triggers FLT, 1.35V triggers GATE latchoff.
2 FB	Voltage regulation feedback input	Internal 1.25V reference point; connects to resistive divider to set output clamp voltage.
3 NC	No connect	Not internally bonded; must be left floating or tied to GND per layout guidelines.
4 OUT	MOSFET source voltage sense	Senses V_OUT to enable EN latching and set TMR charging current baseline.
5 GATE	N-MOSFET gate driver output	Charge-pump-driven; clamped to V_OUT +14V max; delivers 150mA pull-down for OV, 10mA for OC.
6 NC	No connect	Not internally bonded; must be left floating or tied to GND.
7 SNS	Current sense input	Monitors V_CC−V_SNS; internal amplifier holds ΔV = 50mV during overcurrent events.
8 VCC	Main supply input	4–80V operation; withstands −60V reverse battery; supplies all internal circuitry and charge pump.
9 IN+	Auxiliary amplifier non-inverting input	Connects to external signal for comparator or regulator control; clamped to 7V max.
10 NC	No connect	Not internally bonded; must be left floating or tied to GND.
11 AOUT	Auxiliary amplifier output	Open-collector; sinks up to 2mA from 80V; drives LEDs, optos, or PNP pass transistors.
12 GND	Device ground reference	Primary return path for internal amplifiers, logic, and charge pump; connects to system ground plane.
13 EN	Enable status output	Open-collector; goes high-Z when V_OUT > V_CC − 0.7V; latched until V_OUT resets below 0.5V then rises above 2V.
14 FLT	Fault warning output	Open-collector; pulls low at TMR = 1.25V to signal impending shutdown; sinks up to 3mA from 80V.
15 SHDN	Shutdown control input	TTL-compatible; <0.4V for ≥100µs initiates shutdown; tolerates −60V to 100V; internal 7µA pull-up.
16 VCC	Positive supply voltage input	Duplicate VCC pin for improved current handling and thermal distribution in SO package.

Key Features

Feature	Design Value
V_DS-adaptive fault timing	Timer current scales from 2µA to 50µA (OV) or 4µA to 260µA (OC) with V_DS, ensuring MOSFET stays within SOA during transient stress.
Reverse input protection support	Enables back-to-back N-MOSFET configuration instead of Schottky diode, eliminating ~0.4V forward drop and reducing power loss in battery systems.
Adjustable latchoff behavior	Configurable via CTMR; provides fixed 100mV early-warning window (t_WARNING = C_TMR × 20ms/µF) before final shutdown.
Integrated auxiliary amplifier	1.25V-referenced op-amp (AOUT/IN+) usable as precision comparator or linear regulator controller-no external reference needed.
Robust shutdown interface	SHDN withstands −60V to 100V, supports direct connection to 12V/24V battery rails, and includes internal 7µA pull-up for simplified biasing.

Applications

Automotive Load Dump Protection	Industrial Hot-Swap Power Rails
Use Scenario: Protecting infotainment ECUs and ADAS modules from 60V/200ms load dump transients in 12V/24V vehicle electrical systems. IC Role / Device Role / Timing Role: LT4356IS-3#TRPBF acts as active overvoltage regulator, clamping V_OUT to 27V while sustaining load current via external MOSFET during transient. Use Value: Enables uninterrupted operation during ISO 7637-2 Pulse 5a/b events; eliminates need for bulky TVS diodes and reduces board space by 40% vs passive solutions.	Use Scenario: Safely inserting/replacing power modules in programmable logic controllers (PLCs) and factory automation equipment without interrupting upstream 24V DC bus. IC Role / Device Role / Timing Role: LT4356IS-3#TRPBF serves as controlled high-side switch with soft-start and fault-latchoff, limiting inrush and blocking fault propagation. Use Value: Prevents bus collapse during hot-swap; 50mV current limit enables accurate 10A–50A load monitoring; SO-16 package simplifies conformal coating and mechanical mounting.
Battery-Powered System Reverse Polarity Guard	Redundant Power Supply OR-ing Control
Use Scenario: Preventing damage from accidental reverse battery connection in portable medical devices and handheld test equipment powered from removable Li-ion packs. IC Role / Device Role / Timing Role: LT4356IS-3#TRPBF controls back-to-back N-MOSFETs to block reverse current while maintaining <50mΩ on-resistance in forward direction. Use Value: Achieves <0.05V conduction drop vs 0.3–0.4V for Schottky diodes; extends runtime by 3–5% in 12V systems; −60V SHDN rating allows direct battery terminal tie-in.	Use Scenario: Combining two independent 48V telecom rectifiers into a single fault-tolerant output for base station power shelves. IC Role / Device Role / Timing Role: LT4356IS-3#TRPBF configures as precision OR-ing controller using AOUT/IN+ amplifier to balance current between parallel inputs. Use Value: Eliminates need for dedicated OR-ing controllers; 1.25V reference enables <±1% current matching; FLT output signals upstream rectifier failure for automatic switchover.

Automotive Load Dump Protection

Industrial Hot-Swap Power Rails

Use Scenario: Protecting infotainment ECUs and ADAS modules from 60V/200ms load dump transients in 12V/24V vehicle electrical systems.

IC Role / Device Role / Timing Role: LT4356IS-3#TRPBF acts as active overvoltage regulator, clamping V_OUT to 27V while sustaining load current via external MOSFET during transient.

Use Value: Enables uninterrupted operation during ISO 7637-2 Pulse 5a/b events; eliminates need for bulky TVS diodes and reduces board space by 40% vs passive solutions.

Use Scenario: Safely inserting/replacing power modules in programmable logic controllers (PLCs) and factory automation equipment without interrupting upstream 24V DC bus.

IC Role / Device Role / Timing Role: LT4356IS-3#TRPBF serves as controlled high-side switch with soft-start and fault-latchoff, limiting inrush and blocking fault propagation.

Use Value: Prevents bus collapse during hot-swap; 50mV current limit enables accurate 10A–50A load monitoring; SO-16 package simplifies conformal coating and mechanical mounting.

Battery-Powered System Reverse Polarity Guard

Redundant Power Supply OR-ing Control

Use Scenario: Preventing damage from accidental reverse battery connection in portable medical devices and handheld test equipment powered from removable Li-ion packs.

IC Role / Device Role / Timing Role: LT4356IS-3#TRPBF controls back-to-back N-MOSFETs to block reverse current while maintaining <50mΩ on-resistance in forward direction.

Use Value: Achieves <0.05V conduction drop vs 0.3–0.4V for Schottky diodes; extends runtime by 3–5% in 12V systems; −60V SHDN rating allows direct battery terminal tie-in.

Use Scenario: Combining two independent 48V telecom rectifiers into a single fault-tolerant output for base station power shelves.

IC Role / Device Role / Timing Role: LT4356IS-3#TRPBF configures as precision OR-ing controller using AOUT/IN+ amplifier to balance current between parallel inputs.

Use Value: Eliminates need for dedicated OR-ing controllers; 1.25V reference enables <±1% current matching; FLT output signals upstream rectifier failure for automatic switchover.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC4365IMS-2#TRPBF	Fixed 28V clamp; no FB pin; integrated MOSFET driver only (no external FET control); 2.7–42V range.	Lacks adjustable output regulation and external MOSFET flexibility; suited for simpler, lower-voltage systems.	Select LTC4365IMS-2#TRPBF only if fixed 28V clamping and ≤42V operation suffice; not suitable for 80V load dump or custom voltage setting.
TPS26631PWPR	Integrated 80V MOSFET; 1.2V adjustable current limit; no V_DS-adaptive timing; 4.5–60V range.	Monolithic solution eliminates external FET but lacks TMR scaling and auxiliary amplifier; limited to 60V max.	Choose TPS26631PWPR for compact, low-BOM-count designs where 60V rating and fixed timing are acceptable; LT4356IS-3#TRPBF remains preferred for 80V, SOA-optimized, or multi-function use cases.

Compared with LTC4365IMS-2#TRPBF and TPS26631PWPR, the LT4356IS-3#TRPBF offers wider 4–80V operation, user-adjustable clamp voltage via FB, V_DS-adaptive fault timing for MOSFET SOA protection, and an auxiliary amplifier-making it uniquely suited for demanding automotive and industrial power conditioning where flexibility, precision, and ruggedness are critical.

Availability

LT4356IS-3#TRPBF is available at Aetrix Electronics and suitable for automotive ECU protection, industrial hot-swap power rails, and battery-powered reverse polarity guard applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant performance.

Supply support for LT4356IS-3#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and protection solutions.

The LT4356 family was designed specifically for high-reliability power rail conditioning in automotive and industrial environments-delivering robust surge suppression, precise overvoltage regulation, and intelligent MOSFET control in a single IC.

FAQ

What is the maximum input voltage the LT4356IS-3#TRPBF can withstand during normal operation?

The LT4356IS-3#TRPBF operates continuously from 4V to 80V on its VCC pin. During abnormal conditions, its SHDN pin tolerates −60V to 100V, and the SNS pin withstands −60V referenced to VCC (with VCC–SNS ≤30V). This enables direct integration into 12V/24V automotive and industrial battery systems subject to load dump and reverse battery faults. The LT4356IS-3#TRPBF's 80V rating exceeds ISO 7637-2 Pulse 5a requirements.

How does the LT4356IS-3#TRPBF implement overvoltage protection without shutting down immediately?

The LT4356IS-3#TRPBF uses a two-stage fault response: first, it regulates the output voltage by servoing the GATE pin to maintain 1.25V at the FB pin, allowing loads to remain powered; second, it charges the TMR capacitor with a current proportional to V_DS. When TMR reaches 1.25V, FLT asserts low as an early warning; only at 1.35V does GATE latch off. This design preserves system uptime during short transients while protecting the MOSFET during sustained overvoltage. The LT4356IS-3#TRPBF thus balances reliability and availability.

Can the LT4356IS-3#TRPBF drive logic-level MOSFETs at low supply voltages?

Yes-the LT4356IS-3#TRPBF's GATE drive voltage ranges from 4.5V to 16V above V_OUT, depending on VCC. At VCC = 4V, ΔV_GATE is guaranteed ≥4.5V, sufficient for most logic-level N-MOSFETs (V_GS(th) ≤2.5V). At VCC ≥8V, ΔV_GATE ≥10V, supporting standard-threshold devices. This dual-range capability ensures reliable turn-on across cold-crank (4V) and nominal (12V/24V/48V) conditions. The LT4356IS-3#TRPBF's charge-pump architecture maintains gate drive strength independent of input voltage sag.

What is the role of the auxiliary amplifier (AOUT/IN+) in the LT4356IS-3#TRPBF?

The auxiliary amplifier in the LT4356IS-3#TRPBF features an internal 1.25V reference connected to its inverting input and provides an open-collector output (AOUT) capable of sinking 2mA from up to 80V. It can be configured as a precision voltage comparator (e.g., for undervoltage lockout) or as a linear regulator controller driving an external PNP pass transistor. Unlike general-purpose op-amps, it is optimized for level detection and low-quiescent-power biasing-enabling secondary protection or regulation functions without adding discrete components. The LT4356IS-3#TRPBF integrates this function to reduce BOM count and improve system-level reliability.

How do I reset the LT4356IS-3#TRPBF after a fault-induced latchoff?

After GATE latches off due to overvoltage or overcurrent timeout, the LT4356IS-3#TRPBF requires a deliberate reset sequence: pull SHDN low to <0.4V for at least 100µs, then raise it above 2.1V with a slew rate faster than 10V/ms. This ensures internal logic clears the fault state. Do not rely on power cycling alone-the TMR capacitor must discharge to ~0.5V (typical discharge current 2.2µA) before reset attempt. Confirm V_OUT has returned to safe levels prior to reset. The LT4356IS-3#TRPBF's strict reset protocol prevents premature re-engagement under persistent fault conditions.

LT4356IS-3#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Package/Case:: 16-SOIC (0.154", 3.90mm 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:: 16-SO

LT4356IS-3#TRPBF FAQ

1.How can I place an order for LT4356IS-3#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LT4356IS-3#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 LT4356IS-3#TRPBF reliable?

The price and inventory of LT4356IS-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4356IS-3#TRPBF is usually 5 days.

3.What payment methods are accepted for LT4356IS-3#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356IS-3#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LT4356IS-3#TRPBF?

LT4356IS-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LT4356IS-3#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 LT4356IS-3#TRPBF?

For technical support, including LT4356IS-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356IS-3#TRPBF requirements.

6.How does Aetrix verify that LT4356IS-3#TRPBF is sourced from the original manufacturer or authorized distributors?

All LT4356IS-3#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 LT4356IS-3#TRPBF meets industry standards.

7.What is the process for return or replacement of LT4356IS-3#TRPBF?

All LT4356IS-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356IS-3#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 LT4356IS-3#TRPBF part is unused and in its original packaging.

Return procedure for LT4356IS-3#TRPBF:

1.Submit a request within 90 days.

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

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