My Inquiry
My Account
Analog Devices Inc. LT4363IDE-2#PBF
- Part No.:
- LT4363IDE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT4363IDE-2#PBF.pdf
- Description:
- IC SURGE STOPPER HV 12-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,598
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT4363IDE-2#PBF from Analog Devices is a high-voltage surge stopper IC that controls an external N-channel MOSFET to regulate output voltage during transients up to 150V, limits current via 50mV SNS–OUT sense threshold, features adjustable UV/OV comparators (1.275V thresholds), and implements auto-retry fault recovery with 0.5V TMR restart threshold. It protects industrial power supplies and avionic systems against sustained overvoltage and overcurrent faults.
For engineers reviewing the LT4363IDE-2#PBF datasheet, LT4363IDE-2#PBF pinout, LT4363IDE-2#PBF application, or LT4363IDE-2#PBF equivalent, key selection criteria include its –40°C to 85°C operating range, 4V–80V input voltage support, 7µA shutdown current, 12-lead DFN (4mm × 3mm) package, and LT4363-2 auto-restart behavior versus latch-off LT4363-1 variants.
Technical Context
The LT4363IDE-2#PBF integrates dual precision comparators for independent UV (1.275V) and OV (1.275V) monitoring, a 50mV current-sense amplifier with foldback to 25mV below 2V OUT, and a VCC-referenced fault timer whose charging current scales with VDS (VCC–OUT) - ranging from ~4µA at 0.5V to 50µA at 75V for overvoltage, and up to 260µA for overcurrent. Its gate driver delivers 13V above OUT with 14V clamp protection.
Unlike the LT4363-1, the LT4363IDE-2#PBF uses a 2µA cool-down current source that reverses direction at 4.3V on the TMR pin, enabling automatic restart when TMR falls to 0.5V - provided OV < 1.275V. The ENOUT pin latches high-impedance only when OUT is within 0.5V of VCC and >3V above GND, indicating full MOSFET conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 80V continuous operation; withstands –60V reverse input without damage |
| Current Limit Threshold | 50mV across SNS–OUT (reduced to 25mV when OUT < 2V), enabling precise, scalable current limiting |
| UV/OV Comparator Threshold | 1.275V ±12mV (UV), 1.275V ±7.5mV (OV), with independent hysteresis for stable supply monitoring |
| Fault Timer Behavior | Auto-restart (LT4363-2): TMR cools to 0.5V → GATE re-enables; OV > 1.275V inhibits retry |
| Shutdown Current | <7µA at SHDN ≤ 0.4V, supporting ultra-low-power system-level sleep modes |
| Operating Temperature | –40°C to +85°C (I-grade), qualified for industrial and avionic environments |
| Package | 12-lead (4mm × 3mm) plastic DFN with exposed thermal pad (Pin 13 = GND) |
Pinout & Package
LT4363IDE-2#PBF is housed in a 12-lead (4mm × 3mm) plastic DFN package with exposed thermal pad (Pin 13), rated for θJA = 43°C/W. Pin 13 must be connected to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR | Fault timer capacitor node | Charges with VDS-scaled current; 1.275V = FLT warning, 1.375V = MOSFET off, 0.5V = auto-restart trigger (LT4363-2) |
| ENOUT | Open-collector enable output | High-impedance when OUT is within 0.5V of VCC and ≥3V above GND - confirms full MOSFET conduction |
| FLT | Open-collector fault indicator | Pulls low at TMR = 1.275V; remains low until fault clears and TMR resets (LT4363-2) or SHDN reset (LT4363-1) |
| GND | Device ground reference | Common return for internal circuitry; exposed pad (Pin 13) is electrically and thermally tied to GND |
| UV | Undervoltage comparator input | Pull-down GATE if voltage falls below 1.275V; connect to VCC if unused |
| OV | Overvoltage comparator input (LT4363-2 only) | Inhibits retry while >1.275V; prevents oscillation during sustained overvoltage |
| FB | Output voltage feedback input | Sets regulated clamp voltage via resistive divider; 1.275V servo target enables adjustable output clamping |
| OUT | MOSFET source voltage sense | Reference point for SNS current sensing and VDS calculation used by TMR current scaling |
| SNS | Current sense input | Monitors voltage drop across external sense resistor; 50mV limit ensures accurate, temperature-stable current control |
| GATE | N-MOSFET gate drive output | Charge-pump-driven to 13V above OUT; 14V clamp protects gate during fault conditions |
| VCC | Main supply input | 4V–80V operation; supports –60V reverse bias; powers internal circuitry and charge pump |
| SHDN | Shutdown control input | ≤0.4V disables all functions; ≤7µA quiescent current; withstands –60V to +100V |
Key Features
| Feature | Design Value |
|---|---|
| Auto-retry fault recovery | LT4363-2 architecture enables automatic MOSFET re-enable after cool-down (TMR ≤ 0.5V), reducing manual intervention in field-deployed systems |
| VDS-adaptive fault timing | TMR charging current scales with VCC–OUT, dynamically shortening fault timeout under high stress - preserving MOSFET SOA |
| Reverse input protection support | SHDN, UV, OV pins tolerate –60V; enables back-to-back N-MOSFET configurations replacing Schottky diodes, cutting forward drop and power loss |
| Adjustable output clamping | FB pin servo with 1.275V reference allows precise, resistor-defined output voltage limit - e.g., 27V clamp as shown in typical application |
| Fast overcurrent response | <2.5µs turn-off propagation delay (tOFF(OC)) ensures rapid reaction to short-circuit events before MOSFET thermal runaway |
Applications
| Avionic Power Protection | Industrial Hot-Swap Systems |
|---|---|
Use Scenario: Aircraft power distribution units exposed to load dump surges exceeding 100V during generator switching or battery disconnect. IC Role / Device Role / Timing Role: Surge stopper regulating output to safe clamp level (e.g., 27V) while controlling external N-MOSFET; TMR timer adapts to VDS to avoid premature shutdown during brief transients. Use Value: Enables uninterrupted avionics operation during MIL-STD-704F-compliant surges; auto-retry (LT4363-2) restores power after transient clears without pilot action. | Use Scenario: Backplane slots in programmable logic controllers requiring live insertion of I/O modules without disrupting main system power. IC Role / Device Role / Timing Role: High-side switch with controlled inrush limiting and overcurrent protection; UV comparator prevents startup until rail stabilizes. Use Value: Prevents bus voltage sag and data corruption during hot-plug; 50mV current sense enables accurate, low-loss load monitoring across wide temperature range. |
| Intrinsic Safety Barriers | Battery-Powered System Protection |
Use Scenario: Hazardous-area instrumentation (e.g., gas sensors) powered from intrinsically safe 24V loops subject to lightning-induced surges. IC Role / Device Role / Timing Role: Overvoltage regulator clamping output to certified safe voltage; reverse-input tolerance (–60V) accommodates polarity reversal during maintenance. Use Value: Maintains loop integrity and certification compliance; 7µA shutdown current extends battery life in always-on sensor nodes. | Use Scenario: 24V/48V battery-powered mobile equipment (e.g., material handling vehicles) where load dumps exceed 80V and reverse battery connection is possible. IC Role / Device Role / Timing Role: Primary surge protector and reverse-polarity guard; OV comparator blocks re-enable until input returns to safe range post-fault. Use Value: Eliminates need for external TVS and series diode; reduces BOM count and forward voltage loss, improving efficiency and runtime. |
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#PBF | Integrated MOSFET driver + internal 42V MOSFET; fixed 28V overvoltage clamp; no FB pin for adjustable regulation | Lower component count for ≤42V systems; lacks adjustable clamp and VDS-adaptive timing | Select LTC4365 for compact, fixed-threshold designs where external MOSFET control and fine-tuned clamping are unnecessary |
| TPS26631PWPR | Integrated 60V MOSFET; fixed 36V OVP; no UV/OV comparators; 1.2ms fixed fault timer | Optimized for USB PD and PoE; lacks reverse-input tolerance and auto-retry with OV inhibition | Choose TPS26631 for cost-sensitive, lower-voltage DC-fed systems needing basic surge suppression without field-recoverable behavior |
Compared with LTC4365IMS-2#PBF and TPS26631PWPR, LT4363IDE-2#PBF provides design flexibility through adjustable output clamping (via FB), VDS-adaptive fault timing, and robust –60V reverse input tolerance - making it uniquely suited for high-reliability, wide-input industrial and avionic surge protection where external MOSFET optimization and field recovery are critical.
Availability
LT4363IDE-2#PBF is available at Aetrix Electronics and suitable for avionic power protection, industrial hot-swap systems, intrinsic safety barriers, and battery-powered system protection requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT4363IDE-2#PBF 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 industrial, automotive, communications, and aerospace markets.
The LT4363 family is designed for high-reliability DC power path protection in harsh environments - delivering precise overvoltage regulation, adaptive fault timing, and robust reverse-input tolerance for mission-critical systems.
FAQ
What is the key functional difference between LT4363IDE-2#PBF and LT4363IDE-1#PBF?
The LT4363IDE-2#PBF implements auto-retry fault recovery: after a fault timeout, it automatically restarts once the TMR pin discharges to 0.5V, provided the OV pin voltage is below 1.275V. In contrast, the LT4363IDE-1#PBF latches off permanently until manually reset via the SHDN pin. This makes LT4363IDE-2#PBF ideal for unattended systems requiring autonomous recovery from transient overvoltage or overcurrent events.
How does the LT4363IDE-2#PBF achieve VDS-adaptive fault timing?
The LT4363IDE-2#PBF measures VDS indirectly as VCC–OUT and scales the TMR charging current accordingly - from ~4µA at 0.5V VDS to 50µA at 75V for overvoltage, and up to 260µA for overcurrent. This dynamic scaling ensures shorter fault timeouts under high stress, keeping the external MOSFET within its Safe Operating Area. The LT4363IDE-2#PBF's TMR pin directly reflects this adaptive behavior.
Can LT4363IDE-2#PBF be used with back-to-back N-channel MOSFETs for reverse polarity protection?
Yes. The LT4363IDE-2#PBF supports reverse-input protection using back-to-back N-MOSFETs because its SHDN, UV, OV, and VCC pins tolerate –60V. This eliminates the forward voltage drop and power loss of a Schottky diode while maintaining full control over both MOSFET gates via the single GATE output. The LT4363IDE-2#PBF's robust pin ratings make it suitable for battery-powered systems prone to accidental reverse connection.
What is the role of the OV pin on LT4363IDE-2#PBF, and how should it be configured?
The OV pin on LT4363IDE-2#PBF is an overvoltage comparator input that inhibits auto-retry while its voltage exceeds 1.275V. During sustained overvoltage, this prevents motorboating by blocking GATE re-enable until the input returns to a safe level. If unused, the OV pin must be grounded. Its presence distinguishes LT4363IDE-2#PBF from LT4363-1 variants and is essential for reliable operation in environments with persistent overvoltage threats.
Does LT4363IDE-2#PBF require an external current sense resistor, and what is its typical value?
Yes, LT4363IDE-2#PBF requires an external current sense resistor between the SNS and OUT pins. With a nominal 50mV sense threshold, a 10mΩ resistor sets a 5A current limit (50mV / 10mΩ = 5A). For higher currents, lower resistance values are used - e.g., 5mΩ for 10A - ensuring the voltage drop stays within the specified 50mV (or 25mV under severe short) window. The LT4363IDE-2#PBF's precision sense amplifier maintains accuracy across temperature and supply variations.
LT4363IDE-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 12-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tube
- 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)
LT4363IDE-2#PBF FAQ
1.How can I place an order for LT4363IDE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4363IDE-2#PBF 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 LT4363IDE-2#PBF reliable?
The price and inventory of LT4363IDE-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4363IDE-2#PBF is usually 5 days.
3.What payment methods are accepted for LT4363IDE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4363IDE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4363IDE-2#PBF?
LT4363IDE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4363IDE-2#PBF 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 LT4363IDE-2#PBF?
For technical support, including LT4363IDE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4363IDE-2#PBF requirements.
6.How does Aetrix verify that LT4363IDE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT4363IDE-2#PBF 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 LT4363IDE-2#PBF meets industry standards.
7.What is the process for return or replacement of LT4363IDE-2#PBF?
All LT4363IDE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4363IDE-2#PBF, 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 LT4363IDE-2#PBF part is unused and in its original packaging.
Return procedure for LT4363IDE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT4363IDE-2#PBF Tags
-
TVS3300DRVR
Texas Instruments
-
TCPP01-M12
STMicroelectronics
-
TPD4S214YFFR
Texas Instruments
-
TPD6S300ARUKR
Texas Instruments
-
TBU-CA085-300-WH
Bourns Inc.
-
TBU-CA065-500-WH
Bourns Inc.
-
TBU-CA040-100-WH
Bourns Inc.
-
TBU-CA085-500-WH
Bourns Inc.
-
TBU-CA085-200-WH
Bourns Inc.
-
NX20P0408UKZ
NXP Semiconductors
-
TBU-CA085-100-WH
Bourns Inc.
-
TBU-CA050-300-WH
Bourns Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
