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Home > Products > Circuit Protection > Surge Suppression Ics

Analog Devices Inc. LT4356CDE-2#TRPBF

Name: LT4356CDE-2#TRPBF
Brand: Analog Devices Inc.
SKU: LT4356CDE-2#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LT4356CDE-2#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: Surge Suppression Ics

Package:: 12-WFDFN Exposed Pad

Datasheet:: LT4356CDE-2#TRPBF.pdf

Description:: IC SURGE STOPPER ADJ 12-DFN

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Product details

Overview

LT4356CDE-2#TRPBF from Analog Devices is a high-voltage surge stopper IC that regulates output during overvoltage transients (e.g., automotive load dump) by controlling an external N-channel MOSFET gate. It provides adjustable 1.25 V feedback-based output clamping, 50 mV overcurrent sensing threshold, and operates from 4 V to 80 V input. It enables uninterrupted load operation in battery-powered industrial control systems.

For engineers reviewing the LT4356CDE-2#TRPBF datasheet, LT4356CDE-2#TRPBF pinout, LT4356CDE-2#TRPBF application, or LT4356CDE-2#TRPBF equivalent, key selection criteria include its 60 µA shutdown current (vs. 7 µA in -1 variant), active auxiliary amplifier during shutdown, 12-lead DFN (4 mm × 3 mm) package, and guaranteed operation up to +70°C ambient.

Technical Context

The LT4356CDE-2#TRPBF integrates dual protection loops: a voltage amplifier servoing the FB pin to 1.25 V during overvoltage, and a current-sense amplifier limiting ΔVSNS to 50 mV. Its fault timer current scales with V_DS (up to 260 µA during overcurrent), enabling SOA-aware MOSFET stress management.

Unlike the LT4356-1 variant, the LT4356CDE-2#TRPBF maintains auxiliary amplifier functionality and internal 1.25 V reference during shutdown, supporting undervoltage lockout or always-on regulator control. Its SHDN pin tolerates –60 V to +100 V and features TTL-compatible thresholds with 100 µs low-pulse requirement for reliable entry/exit.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Voltage Range	4 V to 80 V - supports cold-crank automotive operation and withstands reverse-battery conditions down to –60 V.
Shutdown Quiescent Current	60 µA - enables low-power standby while preserving auxiliary amplifier and reference for UVLO or linear regulation.
Overcurrent Threshold	50 mV across SNS–VCC - sets precise current limit via external sense resistor without gain calibration.
FB Pin Reference Voltage	1.25 V ±25 mV - defines regulated output clamp voltage via external resistive divider (e.g., 27 V at V_OUT).
Fault Timer Thresholds	FLT asserts at 1.25 V on TMR; GATE turns off at 1.35 V - provides 100 mV early-warning window for system backup actions.
Package	12-lead (4 mm × 3 mm) DFN - thermally enhanced plastic package with optional exposed pad grounding for 43°C/W θ_JA.
Temperature Grade	0°C to +70°C - commercial-grade operation suitable for non-automotive industrial and telecom power systems.

Pinout & Package

LT4356CDE-2#TRPBF is housed in a 12-lead (4 mm × 3 mm) plastic DFN package with exposed thermal pad (Pin 13, optional GND connection). Absolute maximum ratings include V_CC/SHDN = –60 V to +100 V and SNS = –60 V to V_CC + 0.3 V.

Pin	Circuit Role	Design Meaning
IN+	Auxiliary amplifier positive input	Accepts external voltage for comparator or linear regulator control; clamped to 7 V max.
AOUT	Auxiliary amplifier open-collector output	Sinks up to 2 mA from 80 V; usable for LED drive or optocoupler interface during shutdown.
GND	Device ground reference	Common return for internal circuitry and exposed pad (optional connection).
EN	Open-collector enable output	High-impedance when MOSFET is fully on (V_OUT > V_CC – 0.7 V); latched until reset.
FLT	Open-collector fault indicator	Pulls low at TMR = 1.25 V to warn of impending shutdown; sinks up to 3 mA from 80 V.
SHDN	Shutdown control input	TTL-compatible; <0.4 V for 100 µs initiates shutdown; tolerates –60 V to +100 V.
TMR	Fault timer capacitor node	Charged by V_DS-scaled current (up to 260 µA); sets warning, fault, and cool-down timing.
FB	Voltage regulation feedback input	Servo point for 1.25 V reference; connects to resistive divider to set output clamp voltage.
OUT	MOSFET source voltage sense	Detects pass transistor conduction state; triggers EN and sets TMR charging current.
GATE	N-channel MOSFET gate driver	Charge-pump-driven output clamped to V_OUT + 14 V; pulls down with 150 mA during OV fault.
SNS	Current sense input	Monitors voltage drop across external sense resistor; referenced to V_CC for 50 mV threshold.
VCC	Main supply input	4 V–80 V operating range; powers all internal blocks; withstands –60 V reverse bias.

Key Features

Feature	Design Value
Back-to-back FET reverse input protection	Replaces Schottky diode with <100 mV drop, improving efficiency and cold-crank headroom.
V_DS-adaptive fault timer	Timer current scales with MOSFET drain-source voltage-shorter turn-off during high-stress faults to protect SOA.
Active auxiliary amplifier in shutdown	Enables continuous UVLO monitoring or PNP-based linear regulation without full device wake-up.
Robust pin voltage ratings	V_CC, SHDN, SNS tolerate –60 V; OUT, GATE, FLT, EN rated to 80 V-suitable for harsh automotive environments.
Guaranteed 125°C junction operation	Ensures reliability under sustained high-power dissipation in confined enclosures or high-ambient settings.

Applications

Automotive Load Dump Protection	Industrial Hot-Swap Power Distribution
Use Scenario: Protecting infotainment ECUs during 60 V/200 ms load dump events in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Surge stopper regulating output to 27 V via external MOSFET while maintaining load power continuity. Use Value: Prevents system reset or damage by sustaining regulated output during transient, leveraging 1.25 V FB reference and V_DS-scaled fault timing.	Use Scenario: Safely inserting powered modules into live 24 V/48 V factory automation backplanes without bus disturbance. IC Role / Device Role / Timing Role: High-side switch controller limiting inrush current and blocking reverse energy flow via back-to-back MOSFETs. Use Value: Eliminates need for bulky Schottky diodes; reduces insertion voltage drop by >400 mV and improves thermal margin.
Battery-Powered System Overvoltage Clamp	Intrinsic Safety Barrier Power Management
Use Scenario: Clamping 80 V surges on lithium-ion battery packs used in portable test equipment or medical devices. IC Role / Device Role / Timing Role: Adjustable-output regulator holding downstream DC-DC converters within safe input range using FB divider. Use Value: Enables use of cost-effective 36 V-rated downstream ICs instead of 100 V-rated parts, reducing BOM cost and footprint.	Use Scenario: Providing certified-safe power to field instruments in hazardous locations where energy storage must be strictly limited. IC Role / Device Role / Timing Role: Fault-tolerant protector limiting both voltage and current, with early FLT warning enabling controlled graceful shutdown. Use Value: Meets IEC 60079-11 energy limits via precise 50 mV current sense and adaptive timer-no external energy-dissipating components required.

Automotive Load Dump Protection

Industrial Hot-Swap Power Distribution

Use Scenario: Protecting infotainment ECUs during 60 V/200 ms load dump events in 12 V vehicle electrical systems.

IC Role / Device Role / Timing Role: Surge stopper regulating output to 27 V via external MOSFET while maintaining load power continuity.

Use Value: Prevents system reset or damage by sustaining regulated output during transient, leveraging 1.25 V FB reference and V_DS-scaled fault timing.

Use Scenario: Safely inserting powered modules into live 24 V/48 V factory automation backplanes without bus disturbance.

IC Role / Device Role / Timing Role: High-side switch controller limiting inrush current and blocking reverse energy flow via back-to-back MOSFETs.

Use Value: Eliminates need for bulky Schottky diodes; reduces insertion voltage drop by >400 mV and improves thermal margin.

Battery-Powered System Overvoltage Clamp

Intrinsic Safety Barrier Power Management

Use Scenario: Clamping 80 V surges on lithium-ion battery packs used in portable test equipment or medical devices.

IC Role / Device Role / Timing Role: Adjustable-output regulator holding downstream DC-DC converters within safe input range using FB divider.

Use Value: Enables use of cost-effective 36 V-rated downstream ICs instead of 100 V-rated parts, reducing BOM cost and footprint.

Use Scenario: Providing certified-safe power to field instruments in hazardous locations where energy storage must be strictly limited.

IC Role / Device Role / Timing Role: Fault-tolerant protector limiting both voltage and current, with early FLT warning enabling controlled graceful shutdown.

Use Value: Meets IEC 60079-11 energy limits via precise 50 mV current sense and adaptive timer-no external energy-dissipating components required.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC4365IMS-2#TRPBF	Lower 2.5 V to 34 V operating range; integrated MOSFET; no auxiliary amplifier; fixed 28.5 V clamp.	Best for space-constrained 24 V systems requiring minimal external components; lacks adjustable clamp or shutdown-awake amplifier.	Select LTC4365IMS-2#TRPBF when board area is critical and input voltage never exceeds 34 V.
LT4356CDE-1#TRPBF	Same package and pinout; 7 µA shutdown current; auxiliary amplifier disabled in shutdown; identical OV/OC protection.	Preferred for ultra-low-power standby where auxiliary functions are unnecessary during sleep mode.	Choose LT4356CDE-1#TRPBF if shutdown current <10 µA is mandatory and no UVLO or always-on regulation is needed.

Compared with LTC4365IMS-2#TRPBF and LT4356CDE-1#TRPBF, the LT4356CDE-2#TRPBF uniquely balances wide 4 V–80 V operation, adjustable clamping, and active auxiliary functionality during low-power states-enabling flexible system-level protection and monitoring not possible with fixed-clamp or zero-shutdown-amplifier alternatives.

Availability

LT4356CDE-2#TRPBF is available at Aetrix Electronics and suitable for automotive surge protection, industrial hot-swap power distribution, and battery-powered overvoltage clamp applications requiring stable component supply and long-term manufacturability.

Supply support for LT4356CDE-2#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 industrial, automotive, communications, and healthcare markets.

The LT4356 family is designed as high-voltage surge stoppers for mission-critical power systems-specifically targeting automotive load dump, industrial hot-swap, and intrinsic safety applications where robust transient immunity and intelligent fault management are essential.

FAQ

What is the key functional difference between LT4356CDE-2#TRPBF and LT4356CDE-1#TRPBF?

The LT4356CDE-2#TRPBF maintains its auxiliary amplifier and internal 1.25 V reference active during shutdown, enabling undervoltage lockout or always-on linear regulation control. In contrast, the LT4356CDE-1#TRPBF disables all functional blocks-including the auxiliary amplifier-in shutdown, achieving lower 7 µA quiescent current. Both share identical overvoltage and overcurrent protection architecture, pinout, and DFN package.

Can LT4356CDE-2#TRPBF drive logic-level N-channel MOSFETs at low input voltages?

Yes. The LT4356CDE-2#TRPBF's GATE pin delivers ≥4.5 V above V_OUT when V_CC = 4 V, sufficient to fully enhance logic-level N-channel MOSFETs. At higher V_CC, the internal charge pump ensures GATE reaches up to V_OUT + 14 V, supporting standard-threshold MOSFETs. This dual-range capability makes LT4356CDE-2#TRPBF suitable for cold-crank automotive and wide-input industrial systems.

How does the fault timer in LT4356CDE-2#TRPBF adapt to different MOSFET stress levels?

The LT4356CDE-2#TRPBF's TMR pin current scales linearly with the voltage across the external MOSFET (V_DS). During overcurrent, current rises from 4 µA at 0.5 V V_DS to 260 µA at 80 V; during overvoltage, it scales from 2 µA to 50 µA. This ensures faster MOSFET turn-off under high-stress conditions-protecting SOA-while allowing longer ride-through for benign low-V_DS transients.

What is the minimum recommended TMR capacitor value for stable operation of LT4356CDE-2#TRPBF?

A minimum 10 nF ceramic capacitor is required between TMR and GND to compensate the regulation loop and ensure stability. Analog Devices recommends a 10 V-rated X7R dielectric for robustness. Smaller values risk oscillation or false fault triggering; larger values extend warning and fault periods but do not impair basic functionality.

Does LT4356CDE-2#TRPBF support reverse input protection without external diodes?

Yes. LT4356CDE-2#TRPBF enables back-to-back N-channel MOSFET configurations for reverse input protection-replacing Schottky diodes. With proper gate control, this achieves <100 mV forward drop versus >300 mV for diodes, improving efficiency and cold-crank headroom. The IC's –60 V tolerant SHDN, VCC, and SNS pins ensure robustness during reverse-battery events.

LT4356CDE-2#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Package/Case:: 12-WFDFN Exposed Pad

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-DFN (4x3)

LT4356CDE-2#TRPBF FAQ

1.How can I place an order for LT4356CDE-2#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LT4356CDE-2#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 LT4356CDE-2#TRPBF reliable?

The price and inventory of LT4356CDE-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4356CDE-2#TRPBF is usually 5 days.

3.What payment methods are accepted for LT4356CDE-2#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356CDE-2#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LT4356CDE-2#TRPBF?

LT4356CDE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LT4356CDE-2#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 LT4356CDE-2#TRPBF?

For technical support, including LT4356CDE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356CDE-2#TRPBF requirements.

6.How does Aetrix verify that LT4356CDE-2#TRPBF is sourced from the original manufacturer or authorized distributors?

All LT4356CDE-2#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 LT4356CDE-2#TRPBF meets industry standards.

7.What is the process for return or replacement of LT4356CDE-2#TRPBF?

All LT4356CDE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356CDE-2#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 LT4356CDE-2#TRPBF part is unused and in its original packaging.

Return procedure for LT4356CDE-2#TRPBF:

1.Submit a request within 90 days.

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

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