My Inquiry
My Account
Analog Devices Inc. LT4363HS-2#PBF
- Part No.:
- LT4363HS-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4363HS-2#PBF.pdf
- Description:
- IC SURGE STOPPER HV 16-SO
- Quantity:
- Payment:
- Shipping:
Inventory:586
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT4363HS-2#PBF 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 features auto-restart (LT4363-2) with adjustable fault timer. It operates from 4V to 80V input, supports –60V reverse input protection, and delivers precise UV/OV monitoring for industrial power systems.
For engineers reviewing the LT4363HS-2#PBF datasheet, LT4363HS-2#PBF pinout, LT4363HS-2#PBF application, or LT4363HS-2#PBF equivalent, this page provides verified specifications, SO-16 package layout, thermal-safe fault timing behavior, and direct alternatives for hot-swap, avionic surge protection, and battery-powered high-side switch designs.
Technical Context
The LT4363HS-2#PBF implements dual-loop protection: a voltage amplifier regulates GATE to hold FB at 1.275V during overvoltage, while a current amplifier maintains ΔVSNS = 50mV (or 25mV if OUT < 2V) during overcurrent. Fault detection triggers a VDS-dependent TMR capacitor charging current-ranging from 4µA to 50µA in overvoltage and 8µA to 260µA in overcurrent-to dynamically scale timer duration per MOSFET safe operating area.
Unlike the latch-off LT4363-1, the LT4363HS-2#PBF integrates automatic retry after cool-down: TMR discharges to 0.5V (retry threshold), then GATE re-enables the MOSFET-provided OV < 1.275V. Its SO-16 package includes dedicated OV and UV pins, exposed GND pads on pins 7/14, and SHDN tolerance from –60V to 100V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 80V continuous operation; withstands –60V reverse input without damage. |
| Output Clamp Regulation | Adjustable via FB divider; 1.275V reference enables precise 12V–27V clamping (e.g., 27V clamp shown in typical application). |
| Current Limit Threshold | 50mV across SNS–OUT (typical); reduces to 25mV when OUT < 2V to limit MOSFET stress during hard shorts. |
| Fault Timer Behavior | Auto-restart (LT4363-2): TMR cools to 0.5V → GATE re-enabled; OV > 1.275V inhibits retry to prevent motorboating. |
| Shutdown Current | ≤7µA at SHDN ≤ 0.4V; SHDN pin tolerates –60V to 100V, enabling robust system-level control. |
| Propagation Delays | tOFF(OV) = 0.25–1µs; tOFF(OC) = 1–2.5µs; enables fast response to transients before downstream damage occurs. |
| Package & Temp Range | 16-pin SO (S package); rated for –40°C to +125°C (H-grade), suitable for under-hood and industrial environments. |
Pinout & Package
LT4363HS-2#PBF uses a 16-lead plastic SO package (S package) with exposed GND on pins 7 and 14. Pin 1 is top-left corner (OUT), pin 16 is bottom-right (OV). GND connections are on pins 7, 14, and internally tied.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Output voltage sense input | Senses source of external N-MOSFET; sets VDS-dependent TMR current and ENOUT latching threshold (0.5V below VCC). |
| SNS (Pin 2) | Current sense input | Connects to high-side of sense resistor; ΔVSNS regulated to 50mV (or 25mV if OUT < 2V) to enforce current limit. |
| NC (Pin 3) | No connect | Internally unused; must be left floating or grounded per layout guidelines. |
| GATE (Pin 4) | N-MOSFET gate drive output | Charge-pump driven; clamped to ≤14V above OUT; pulls down with ≥50mA sink capability during faults. |
| NC (Pin 5) | No connect | Internally unused; must be left floating or grounded. |
| VCC (Pin 6) | Main supply input | 4V–80V operating range; withstands –60V reverse bias; powers internal circuitry and charge pump. |
| NC (Pin 7) | GND (exposed pad) | Exposed thermal pad tied to GND; improves thermal dissipation and EMI performance. |
| SHDN (Pin 8) | Shutdown control input | Pull ≤0.4V to enter 7µA shutdown; tolerates –60V to 100V; no external pull-up required due to internal source. |
| FB (Pin 9) | Feedback input for OV regulation | 1.275V reference point; connects to resistive divider from OUT to GND to set clamp voltage (e.g., 27V). |
| TMR (Pin 10) | Fault timer capacitor connection | Capacitor to GND sets warning (1.275V), turn-off (1.375V), and retry (0.5V) thresholds; current scales with VCC–OUT. |
| NC (Pin 11) | No connect | Internally unused; must be left floating or grounded. |
| ENOUT (Pin 12) | Enable output indicator | Open-collector; goes high-Z when OUT ≥ VCC – 0.5V and ≥ 3V, signaling MOSFET fully on. |
| FLT (Pin 13) | Fault indicator output | Open-collector; pulls low at TMR = 1.275V (early warning); remains low until TMR ≤ 0.5V (LT4363-2) or reset (LT4363-1). |
| GND (Pin 14) | Device ground | Primary GND connection; ties to exposed pad (Pin 7) for thermal and noise integrity. |
| UV (Pin 15) | Undervoltage comparator input | 1.275V threshold; pulls GATE low if UV < 1.275V; hysteresis = 12mV; connect to VCC if unused. |
| OV (Pin 16) | Overvoltage comparator input | 1.275V threshold; blocks retry if OV > 1.275V (LT4363-2 only); connect to GND if unused. |
Key Features
| Feature | Design Value |
|---|---|
| VDS-dependent fault timing | TMR current scales with (VCC – OUT), shortening timer during high-stress conditions to protect MOSFET SOA. |
| Auto-restart with OV inhibition | LT4363-2 version restarts after TMR cools to 0.5V-but only if OV pin < 1.275V, preventing oscillation during sustained surges. |
| Reverse input protection support | SHDN, UV, OV, and VCC tolerate –60V; enables back-to-back N-MOSFET configuration replacing Schottky diodes. |
| Fast, accurate current limiting | 50mV sense threshold with <5µs response; reduced to 25mV during severe shorts (OUT < 2V) to minimize MOSFET power loss. |
| Robust shutdown interface | 7µA shutdown current; SHDN pin withstands –60V to 100V, eliminating need for external level-shifting circuitry. |
Applications
| Avionic Power Protection | Industrial Hot-Swap Systems |
|---|---|
|
Use Scenario: Aircraft power distribution units exposed to load dump transients exceeding 100V. IC Role / Device Role / Timing Role: Surge stopper regulating output to 27V while controlling external N-MOSFET; TMR timer ensures MOSFET stays within SOA during 100ms surges. Use Value: Enables uninterrupted avionics operation during MIL-STD-704F transients without derating MOSFET or adding bulk clamping. |
Use Scenario: Backplane slots requiring live insertion with zero-downtime power sequencing. IC Role / Device Role / Timing Role: High-side switch with programmable inrush control; UV/OV comparators block insertion outside safe rail window. Use Value: Prevents bus collapse during card insertion by limiting peak inrush current to 500mA via 10mΩ sense resistor. |
| Battery-Powered Telematics | Intrinsic Safety Barriers |
|
Use Scenario: Vehicle telematics modules powered from 12V battery with jump-start and reverse-battery risk. IC Role / Device Role / Timing Role: Reverse-input protected high-side switch; SHDN handles microcontroller-controlled power gating. Use Value: Eliminates Schottky diode drop (0.4V), increasing available load voltage by 3.3% at 5A while surviving –60V reverse events. |
Use Scenario: Hazardous-area sensors requiring energy-limited power delivery per IEC 60079-11. IC Role / Device Role / Timing Role: Current-limited, thermally self-protecting power switch; fault timer enforces strict energy cutoff during short circuits. Use Value: Limits fault energy to <10mJ using 6.8µF TMR capacitor, satisfying entity parameter requirements without external fusing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS-2#PBF | Wider 2.5V–40V input range; integrated MOSFET; no external sense resistor needed; fixed 5.8V clamp. | Lower voltage systems (<40V); space-constrained PCBs where discrete MOSFET layout is impractical. | Select LTC4365IMS-2#PBF when board area is critical and input stays below 40V; LT4363HS-2#PBF retains flexibility for >40V and custom MOSFET selection. |
| TPS26631PWPR | 4.5V–60V input; integrated 80mΩ FET; fixed 32V overvoltage clamp; no adjustable UV/OV or TMR timing. | Cost-sensitive industrial IO modules needing basic surge suppression without precision regulation. | Choose TPS26631PWPR for simplified BOM and faster design-in where 32V clamp and no retry control suffice; LT4363HS-2#PBF offers full programmability and 150V surge tolerance. |
Compared with LTC4365IMS-2#PBF and TPS26631PWPR, LT4363HS-2#PBF uniquely supports >80V inputs, field-adjustable clamping, and VDS-scaled fault timing-making it the only option for avionics-grade 100V+ transient ride-through with thermal-aware MOSFET protection.
Availability
LT4363HS-2#PBF is available at Aetrix Electronics and suitable for avionic power protection, industrial hot-swap systems, and battery-powered telematics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT4363HS-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 (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT4363 family was designed specifically for high-reliability DC power protection in harsh environments-enabling robust surge suppression, precise current limiting, and intelligent fault recovery in aerospace, transportation, and industrial control systems.
FAQ
What is the key functional difference between LT4363HS-2#PBF and LT4363HS-1#PBF?
The LT4363HS-2#PBF implements auto-restart functionality: after a fault timeout, it automatically resumes operation once the TMR capacitor discharges to 0.5V-provided the OV pin voltage is below 1.275V. In contrast, the LT4363HS-1#PBF latches off permanently and requires an active SHDN pulse (≤100µs low) to reset. This makes LT4363HS-2#PBF ideal for unattended systems needing autonomous recovery from transient overvoltage or overcurrent events.
How does the LT4363HS-2#PBF achieve VDS-dependent fault timing?
The LT4363HS-2#PBF measures VDS indirectly via the voltage difference between VCC and OUT pins. This differential drives a current source into the TMR capacitor: higher VDS yields higher charging current (e.g., 4µA at VDS ≤ 0.5V, up to 50µA at VDS = 75V for overvoltage). As a result, fault duration shortens under high-stress conditions-keeping the external MOSFET within its safe operating area without requiring manual derating.
Can LT4363HS-2#PBF be used with P-channel MOSFETs?
No, the LT4363HS-2#PBF is designed exclusively for N-channel MOSFETs. Its GATE driver is a charge-pump-based high-side driver referenced to the OUT pin (source), capable of pulling GATE up to 14V above OUT. Driving a P-channel MOSFET would require low-side gate control relative to VCC-an architecture incompatible with LT4363HS-2#PBF's internal amplifier topology and feedback loop.
What is the minimum TMR capacitor value required for stable operation of LT4363HS-2#PBF?
The LT4363HS-2#PBF requires a minimum 10nF capacitor on the TMR pin to ensure loop stability and reliable fault timing. Smaller values may cause erratic FLT assertion or failed auto-restart due to insufficient filtering of internal current-source noise. For standard 27V clamp applications with 100ms surge ride-through, a 6.8µF ceramic capacitor is commonly used-yielding ~97ms total fault time before turn-off.
Does LT4363HS-2#PBF support reverse polarity protection without additional components?
Yes-the LT4363HS-2#PBF supports reverse input protection natively: its VCC, SHDN, UV, and OV pins tolerate –60V, and the GATE driver remains inactive when OUT < UV threshold. When paired with a second N-channel MOSFET in back-to-back configuration (source-to-source), it replaces Schottky diodes entirely-eliminating forward voltage drop and thermal losses while maintaining full –60V survivability without external TVS or diodes.
LT4363HS-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Clamping:
- Adjustable
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT4363HS-2#PBF FAQ
1.How can I place an order for LT4363HS-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4363HS-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 LT4363HS-2#PBF reliable?
The price and inventory of LT4363HS-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 LT4363HS-2#PBF is usually 5 days.
3.What payment methods are accepted for LT4363HS-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4363HS-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4363HS-2#PBF?
LT4363HS-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4363HS-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 LT4363HS-2#PBF?
For technical support, including LT4363HS-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4363HS-2#PBF requirements.
6.How does Aetrix verify that LT4363HS-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT4363HS-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 LT4363HS-2#PBF meets industry standards.
7.What is the process for return or replacement of LT4363HS-2#PBF?
All LT4363HS-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4363HS-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 LT4363HS-2#PBF part is unused and in its original packaging.
Return procedure for LT4363HS-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT4363HS-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…
