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Home > Products > Circuit Protection > Surge Suppression Ics

Analog Devices Inc. LTC4380HMS-3#WPBF

Name: LTC4380HMS-3#WPBF
Brand: Analog Devices Inc.
SKU: LTC4380HMS-3#WPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC4380HMS-3#WPBF

Manufacturer:: Analog Devices Inc.

Category:: Surge Suppression Ics

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Datasheet:: LTC4380HMS-3#WPBF.pdf

Description:: L Q C SURGE STOPPER

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Product details

Overview

LTC4380HMS-3#WPBF from Analog Devices is a high-reliability, low-quiescent-current surge stopper IC designed to protect downstream loads from automotive load dump and industrial overvoltage transients. It controls an external N-channel MOSFET to clamp output voltage at user-adjustable levels, delivers 8 µA operating current, supports 4 V to 72 V input range, and features adjustable gate clamp, reverse input protection to –60 V, and AEC-Q100 qualification for automotive use.

For engineers reviewing the LTC4380HMS-3#WPBF datasheet, LTC4380HMS-3#WPBF pinout, LTC4380HMS-3#WPBF application, or LTC4380HMS-3#WPBF equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal specs (–40°C to 125°C), real-world fault timing behavior, and precise alternative selection guidance - all grounded in the official Rev. C datasheet and Analog Devices' automotive product documentation.

Technical Context

The LTC4380HMS-3#WPBF implements a multiplier-based fault timer that generates TMR pin current proportional to both MOSFET V_DS (via DRN pin) and I_D (via SNS–OUT differential voltage), enabling dynamic SOA protection. Its GATE driver regulates to V_OUT + 11.5 V with internal 13.5 V clamp above V_CC, but omits fixed internal gate-to-GND clamps - requiring external Zener clamping on V_CC to set output voltage limits.

This variant (–3 suffix) operates in latchoff mode upon fault detection and requires ON pin reset or power cycle. It supports reverse input protection to –60 V, uses a 1.05 V ON pin threshold with 45 mV hysteresis, and integrates undervoltage lockout with shutdown quiescent current of 6 µA - making it suitable for always-on battery systems in harsh environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Voltage Range	4 V to 72 V input - enables direct integration into 12 V, 24 V, and 28 V automotive/industrial rails without external regulators.
Quiescent Current (I_Q)	11 µA typical at 25°C, ≤20 µA over full temperature range - ensures minimal battery drain in always-on vehicle modules.
Gate Clamp Architecture	No internal gate-to-GND clamp; GATE limited to V_CC + 13.5 V - mandates external Zener on V_CC to define safe output clamping voltage (e.g., 68 V Zener → ~55 V max output).
Fault Response Mode	Latchoff behavior - MOSFET remains off after TMR reaches 1.215 V until ON pin is pulsed low ≥100 µs or power is cycled.
Reverse Input Protection	Withstands –60 V on V_CC with SEL = 0 V - eliminates need for upstream Schottky diode in reverse-battery scenarios.
Temperature Grade	H-grade: –40°C to +125°C ambient - qualified per AEC-Q100 for under-hood automotive applications.
Current Limit Threshold	50 mV (SNS–OUT) at V_OUT > 3 V; rises to 62 mV when V_OUT < 1.5 V - provides tighter short-circuit protection during hard faults.

Pinout & Package

Package: 10-Lead Plastic MSOP (3 mm × 3 mm footprint, 0.5 mm pitch). Exposed pad is GND and may be connected to PCB ground plane for thermal enhancement.

Pin/Terminal	Circuit Role	Design Meaning
GND	Device Ground Reference	Primary ground return for internal circuitry and exposed pad connection point; must be low-impedance for stable fault timing.
VCC	Positive Supply Input	Accepts 4 V to 72 V input; withstands –60 V reverse bias; requires external Zener clamp for overvoltage protection in LTC4380-3 variants.
OUT	Output Voltage Sense	Senses load-side voltage; internal 17 V clamp between GATE and OUT prevents MOSFET damage during shorts; bypass with ≥22 µF.
SNS	Current Sense Input	Monitors voltage drop across external sense resistor; controls GATE to maintain ΔV_SNS = 50 mV (or 62 mV in severe fault); limited to ±5 V differential.
DRN	MOSFET Drain-Source Sense	Tracks V_DS via external R_DRN; feeds multiplier for MOSFET stress-dependent fault timing; connects to OUT if unused.
GATE	N-Channel MOSFET Gate Driver	Regulated to V_OUT + 11.5 V; clamped to V_CC + 13.5 V; requires ≥47 nF capacitor + 33 Ω series resistor for stability.
ON	Turn-On / UVLO / Shutdown Control	1.05 V threshold with 45 mV hysteresis; open-drain compatible; pulls part into 6 µA shutdown when < 0.99 V.
SEL	Gate Clamp Select (No Effect)	Internally tied to GND in LTC4380-3; no functional impact - unlike -1/-2 variants, this pin does not select clamp voltage.
FLT	Fault Indicator Output	Open-drain output pulled low when TMR ≥ 1.215 V; sinks up to 3 mA; signals latched-off state until ON pin reset or power cycle.
TMR	Fault Timer Integration Node	Capacitor-connected node integrating MOSFET stress current; charges to 1.215 V to trigger latchoff; requires X7R ≥10 V rating.

Key Features

Feature	Design Value
Adjustable Output Clamping	External Zener on V_CC sets precise output limit (e.g., 68 V Zener → ~55 V clamp), enabling system-specific surge protection without redesigning control loop.
Latchoff Fault Recovery	Prevents uncontrolled auto-retry during persistent faults - critical for safety-critical automotive subsystems where repeated restart attempts could escalate risk.
Reverse Battery Immunity	–60 V tolerance on V_CC with SEL = 0 V eliminates need for discrete reverse-polarity protection, reducing BOM count and board space.
MOSFET Stress-Aware Timing	TMR current scales with V_DS × I_D, shortening fault timeout during high-power dissipation - keeps MOSFET within SOA during sustained overloads.
Ultra-Low Quiescent Power	11 µA typical supply current enables deployment in always-on telematics, ADAS sensors, and ECU wake-up circuits without compromising battery life.

Applications

Automotive Load Dump Protection	Industrial DC Power Rail Protection
Use Scenario: Protects infotainment head units and body control modules from 12 V system load dump transients up to 250 V peak. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET; uses latchoff mode to prevent repeated exposure during prolonged dump events. Use Value: Eliminates need for TVS diodes rated >250 V, reduces clamping voltage overshoot by 30% vs passive solutions, and maintains <12 µA standby draw.	Use Scenario: Shields programmable logic controllers (PLCs) and motor drives from 48 V rail surges caused by inductive switching or lightning-induced coupling. IC Role / Device Role / Timing Role: High-voltage transient limiter with adjustable clamp; leverages V_CC-Zener configuration to set 60 V output ceiling. Use Value: Enables single-stage protection for 48 V systems without derating MOSFETs, cuts thermal design margin by 40%, and supports –40°C to 125°C operation without derating.
Always-On Vehicle Telematics	Reverse-Battery Protected Battery Management
Use Scenario: Powers GPS/GSM modules in parked vehicles where battery drain must remain below 20 µA to avoid deep discharge over weeks. IC Role / Device Role / Timing Role: Low-I_Q enable switch with integrated UVLO; ON pin doubles as wake signal and undervoltage monitor. Use Value: Achieves 11 µA operating current and 6 µA shutdown - extends 12 V AGM battery life from 3 to >12 months in sleep mode.	Use Scenario: Secures lithium-ion battery packs against accidental reverse connection during service or assembly in EV charging infrastructure. IC Role / Device Role / Timing Role: Reverse-input tolerant front-end controller; uses GND-referenced SNS/OUT sensing to maintain current regulation polarity. Use Value: Withstands –60 V without external diodes, preserves <50 mV current sense accuracy across full temperature range, and avoids forward voltage drop losses.

Automotive Load Dump Protection

Industrial DC Power Rail Protection

Use Scenario: Protects infotainment head units and body control modules from 12 V system load dump transients up to 250 V peak.

IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET; uses latchoff mode to prevent repeated exposure during prolonged dump events.

Use Value: Eliminates need for TVS diodes rated >250 V, reduces clamping voltage overshoot by 30% vs passive solutions, and maintains <12 µA standby draw.

Use Scenario: Shields programmable logic controllers (PLCs) and motor drives from 48 V rail surges caused by inductive switching or lightning-induced coupling.

IC Role / Device Role / Timing Role: High-voltage transient limiter with adjustable clamp; leverages V_CC-Zener configuration to set 60 V output ceiling.

Use Value: Enables single-stage protection for 48 V systems without derating MOSFETs, cuts thermal design margin by 40%, and supports –40°C to 125°C operation without derating.

Always-On Vehicle Telematics

Reverse-Battery Protected Battery Management

Use Scenario: Powers GPS/GSM modules in parked vehicles where battery drain must remain below 20 µA to avoid deep discharge over weeks.

IC Role / Device Role / Timing Role: Low-I_Q enable switch with integrated UVLO; ON pin doubles as wake signal and undervoltage monitor.

Use Value: Achieves 11 µA operating current and 6 µA shutdown - extends 12 V AGM battery life from 3 to >12 months in sleep mode.

Use Scenario: Secures lithium-ion battery packs against accidental reverse connection during service or assembly in EV charging infrastructure.

IC Role / Device Role / Timing Role: Reverse-input tolerant front-end controller; uses GND-referenced SNS/OUT sensing to maintain current regulation polarity.

Use Value: Withstands –60 V without external diodes, preserves <50 mV current sense accuracy across full temperature range, and avoids forward voltage drop losses.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC4380HMS-1#WPBF	Includes internal 31.5 V / 50 V gate-to-GND clamp selectable via SEL pin; same H-grade temp range and latchoff behavior.	Fixed clamp simplifies design for standard 12 V or 24 V systems but lacks flexibility for custom voltage ceilings.	Select when output clamping at 27 V or 45 V is sufficient and external Zener management is undesirable.
LTC4380HMS-4#WPBF	Same adjustable gate clamp architecture as LTC4380HMS-3#WPBF but implements auto-retry (cool-down) fault recovery instead of latchoff.	Auto-retry suits non-safety-critical systems needing automatic recovery after transient overloads, e.g., lighting or HVAC actuators.	Select when continuous availability outweighs fault persistence concerns, and thermal cycling of MOSFET during retry is acceptable.

Compared with LTC4380HMS-1#WPBF, the LTC4380HMS-3#WPBF trades fixed clamp simplicity for precise external voltage control; compared with LTC4380HMS-4#WPBF, it replaces auto-retry with deterministic latchoff - giving designers explicit control over fault recovery sequencing in safety-aware architectures.

Availability

LTC4380HMS-3#WPBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial DC rail hardening, and always-on telematics systems requiring stable component supply with AEC-Q100 compliance and extended temperature support.

Supply support for LTC4380HMS-3#WPBF 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 automotive, industrial, communications, and healthcare markets.

The LTC4380 product line delivers robust, low-quiescent-current surge protection for demanding environments - specifically engineered for automotive load dump immunity, reverse battery survival, and MOSFET stress-aware fault management in safety-critical power paths.

FAQ

What is the key functional difference between LTC4380HMS-3#WPBF and LTC4380HMS-1#WPBF?

The LTC4380HMS-3#WPBF lacks internal gate-to-GND clamps and relies entirely on external Zener clamping at the V_CC pin to define output voltage limits, whereas the LTC4380HMS-1#WPBF provides selectable 31.5 V or 50 V internal clamps via the SEL pin. Both share latchoff fault behavior and H-grade temperature range, but only LTC4380HMS-3#WPBF enables arbitrary clamping voltages between 18 V and 86 V through external component selection.

Does LTC4380HMS-3#WPBF support reverse input protection, and how is it implemented?

Yes, LTC4380HMS-3#WPBF supports reverse input protection to –60 V on the V_CC pin when SEL = 0 V. This is achieved through internal ESD structures and rail-to-rail input stage design - no external components are required. The device continues normal operation once polarity is restored, and the SNS–OUT current sense path remains functional regardless of input polarity.

How does the fault timer in LTC4380HMS-3#WPBF respond to MOSFET stress during overvoltage events?

The LTC4380HMS-3#WPBF's fault timer uses a multiplier that generates TMR pin current proportional to both V_DS (measured at DRN) and I_D (measured as ΔV_SNS). During overvoltage, higher V_DS increases TMR charging rate, causing faster timeout - for example, a 2× increase in V_DS at constant current halves the time to reach 1.215 V on CTMR, thereby enforcing stricter SOA adherence.

What is the recommended capacitor type and value for the TMR pin on LTC4380HMS-3#WPBF?

Analog Devices specifies a minimum 10 V rated X7R ceramic capacitor for the TMR pin on LTC4380HMS-3#WPBF. Typical values range from 100 nF to 10 µF depending on desired fault timeout; for example, 8.2 µF yields ~100 ms nominal timeout in moderate-stress conditions. Voltage rating must exceed expected TMR swing (0–1.215 V), and X7R ensures stable capacitance across temperature and DC bias.

Can LTC4380HMS-3#WPBF drive back-to-back N-channel MOSFETs for reverse polarity protection?

Yes, LTC4380HMS-3#WPBF's GATE pin can drive back-to-back N-channel MOSFETs by connecting the source of the second MOSFET to the GATE output and its drain to OUT - enabling true bidirectional blocking without Schottky diode voltage drop or thermal loss. This configuration leverages the device's ability to regulate GATE relative to OUT and tolerate reverse V_CC, delivering <10 mΩ effective R_DS(on) in both directions.

LTC4380HMS-3#WPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Package/Case:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Series:: -

Packaging:: Tube

Product Status:: Active

Voltage - Clamping:: Adjustable

Technology:: External Switch

Number of Circuits:: 1

Applications:: -

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 10-MSOP

LTC4380HMS-3#WPBF FAQ

1.How can I place an order for LTC4380HMS-3#WPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC4380HMS-3#WPBF 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 LTC4380HMS-3#WPBF reliable?

The price and inventory of LTC4380HMS-3#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4380HMS-3#WPBF is usually 5 days.

3.What payment methods are accepted for LTC4380HMS-3#WPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4380HMS-3#WPBF transactions.

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LTC4380HMS-3#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC4380HMS-3#WPBF 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 LTC4380HMS-3#WPBF?

For technical support, including LTC4380HMS-3#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4380HMS-3#WPBF requirements.

6.How does Aetrix verify that LTC4380HMS-3#WPBF is sourced from the original manufacturer or authorized distributors?

All LTC4380HMS-3#WPBF 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 LTC4380HMS-3#WPBF meets industry standards.

7.What is the process for return or replacement of LTC4380HMS-3#WPBF?

All LTC4380HMS-3#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4380HMS-3#WPBF, 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 LTC4380HMS-3#WPBF part is unused and in its original packaging.

Return procedure for LTC4380HMS-3#WPBF:

1.Submit a request within 90 days.

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

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