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Analog Devices Inc. LT4363HDE-2#TR
- Part No.:
- LT4363HDE-2#TR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT4363HDE-2#TR.pdf
- Description:
- IC SURGE STOPPER HV 12-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,228
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Product details
Overview
LT4363HDE-2#TR 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 100V, limit current via 50mV SNS–OUT sense threshold, and provide adjustable UV/OV protection with –40°C to 125°C operating range. It enables uninterrupted operation in avionic power systems during 80V surges.
For engineers reviewing the LT4363HDE-2#TR datasheet, LT4363HDE-2#TR pinout, LT4363HDE-2#TR application, or LT4363HDE-2#TR equivalent, key selection criteria include fault timer behavior (auto-retry cool-down), 7µA shutdown current, 12-lead 4mm × 3mm DFN package, and precise 1.275V FB reference for adjustable clamp voltage.
Technical Context
The LT4363HDE-2#TR implements dual-fault protection using independent voltage and current amplifiers: one regulates GATE to hold FB at 1.275V during overvoltage, another limits ΔVSNS to 50mV (25mV if OUT < 2V) during overcurrent. Its TMR pin uses VCC–OUT–dependent current sources-ranging from 4µA to 50µA for OV and 8µA to 260µA for OC-to dynamically scale fault timing per MOSFET SOA.
Unlike the latch-off LT4363-1, the LT4363-2 variant features auto-restart after cool-down: TMR discharges to 0.5V, then GATE pulls high only if OV < 1.275V, preventing motorboating under sustained overvoltage. The SHDN pin withstands –60V to 100V and reduces ICC to ≤7µA when pulled low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4V to 80V operating; survives –60V reverse input without damage |
| FB Reference | 1.275V ±25mV; sets adjustable output clamp voltage via resistive divider |
| Current Sense Threshold | 50mV (OUT > 2V), 25mV (OUT < 2V); enables precise, adaptive overcurrent limiting |
| Fault Timer Behavior | Auto-retry (LT4363-2): restarts after TMR cools to 0.5V, conditional on OV < 1.275V |
| Shutdown Current | ≤7µA at TA = 125°C; enables ultra-low-power system standby |
| Package | 12-lead (4mm × 3mm) plastic DFN with exposed thermal pad (GND) |
| Operating Temp | –40°C to +125°C (H-grade); qualified for harsh industrial/avionic environments |
Pinout & Package
LT4363HDE-2#TR is housed in a 12-lead (4mm × 3mm) plastic DFN package with exposed thermal pad connected to GND. Pin numbering follows standard DE-package top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 TMR | Fault timer capacitor node | Charges with VCC–OUT–scaled current; triggers FLT at 1.275V, shuts off GATE at 1.375V, enables retry at 0.5V (LT4363-2) |
| 2 ENOUT | Open-collector enable output | High-impedance when MOSFET fully on (VOUT ≥ VCC – 0.5V); latched until VOUT < 2V |
| 3 FLT | Open-collector fault indicator | Pulls low at TMR = 1.275V (early warning); remains low until fault cleared and TMR resets |
| 4 GND | Device ground reference | Common return for internal circuitry; exposed pad must be connected to PCB GND for thermal performance |
| 5 UV | Undervoltage comparator input | Pulls GATE low if voltage < 1.275V; hysteresis = 12mV; connect to VCC if unused |
| 6 OV | Overvoltage comparator input (LT4363-2 only) | Inhibits retry if >1.275V; prevents oscillation during sustained overvoltage; connect to GND if unused |
| 7 FB | Feedback input for output regulation | Servo point for 1.275V reference; connects to resistive divider between OUT and GND to set clamp voltage |
| 8 OUT | Output voltage sense node | Monitors source of external N-MOSFET; used with SNS to measure current; defines VCC–OUT for TMR scaling |
| 9 SNS | Current sense input | Measures voltage drop across external sense resistor; ΔVSNS limited to 50mV (or 25mV during severe short) |
| 10 GATE | N-MOSFET gate drive output | Charge-pump driven to 13V above OUT; clamped at 14V; controls pass transistor conduction |
| 11 VCC | Main supply input | 4V–80V operating range; withstands –60V reverse bias; powers internal regulators and gate driver |
| 12 SHDN | Shutdown control input | Active-low enable; ≤0.4V disables device (ICC ≤7µA); tolerates –60V to 100V; no external pull-up required |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable fault timer with dynamic SOA scaling | TMR current varies with VCC–OUT (4–50µA for OV, 8–260µA for OC), optimizing MOSFET stress across transient profiles |
| Auto-retry with OV lockout | LT4363-2 restarts only after TMR cools to 0.5V AND OV < 1.275V-prevents uncontrolled cycling during persistent overvoltage |
| Reverse input protection support | SHDN, UV, OV pins rated –60V to 100V; enables back-to-back N-MOSFET configuration replacing lossy Schottky diodes |
| Precision dual-threshold comparators | UV and OV inputs feature 1.275V thresholds with 12mV/7.5mV hysteresis for stable supply monitoring without external components |
| Low-quiescent shutdown mode | 7µA max ICC at 125°C allows long-term battery-backed operation without significant drain |
Applications
| Avionic Power Distribution | Industrial Hot-Swap Systems |
|---|---|
Use Scenario: Aircraft power buses experience 100V load-dump transients; downstream flight-critical loads must remain powered. IC Role / Device Role / Timing Role: LT4363HDE-2#TR regulates output to 27V during 80V surges while controlling external FDB33N25 MOSFET as series pass element. Use Value: Enables uninterrupted operation during MIL-STD-704F Category A transients; 125°C H-grade ensures reliability at altitude. | Use Scenario: Programmable logic controllers require live insertion of I/O modules without disrupting main CPU power rail. IC Role / Device Role / Timing Role: LT4363HDE-2#TR acts as intelligent high-side switch with programmable fault timer and auto-retry for controlled module re-engagement. Use Value: Prevents bus collapse during hot-plug inrush; 5µs overcurrent response protects against connector arcing damage. |
| Intrinsic Safety Barriers | Battery-Powered Test Equipment |
Use Scenario: Field instruments in hazardous areas must limit energy delivered to intrinsically safe (IS) barriers during fault conditions. IC Role / Device Role / Timing Role: LT4363HDE-2#TR enforces strict current and voltage limits on IS loop power supplies using precision 50mV sense threshold. Use Value: Meets IEC 60079-11 requirements via deterministic fault timing and sub-1% retry duty cycle during sustained shorts. | Use Scenario: Portable multimeters draw power from Li-ion batteries; reverse polarity connection must not damage circuitry. IC Role / Device Role / Timing Role: LT4363HDE-2#TR provides reverse-input protection using back-to-back N-MOSFETs, eliminating Schottky forward drop. Use Value: Reduces voltage loss by >0.3V vs. diode solution, extending battery runtime; –60V SHDN tolerance enables robust reverse-battery handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4363HDE-1#TRPBF | Latch-off behavior: GATE remains off after fault until manual SHDN reset; no auto-retry | Suitable for safety-critical systems requiring hard fault lockout (e.g., medical equipment) | Select LT4363HDE-1#TRPBF only when automatic recovery is prohibited by system safety architecture |
| LT4363IMS-2#TRPBF | Same functionality but in 12-lead MSOP package (4.9mm × 3.0mm); θJA = 135°C/W vs. 43°C/W for DFN | Preferred for prototyping or space-constrained boards where DFN rework is impractical | Choose LT4363IMS-2#TRPBF when thermal performance is secondary to assembly flexibility or legacy footprint compatibility |
Compared with LT4363HDE-1#TRPBF, the LT4363HDE-2#TR provides autonomous recovery after transient faults, reducing operator intervention; versus LT4363IMS-2#TRPBF, it delivers superior thermal dissipation in high-power avionic applications due to lower θJA and exposed-pad DFN construction.
Availability
LT4363HDE-2#TR is available at Aetrix Electronics and suitable for avionic power distribution, industrial hot-swap systems, intrinsic safety barriers, and battery-powered test equipment requiring stable component supply across extended temperature ranges.
Supply support for LT4363HDE-2#TR 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 designs high-performance analog, mixed-signal, and digital signal processing ICs for precision instrumentation, industrial automation, and aerospace systems.
The LT4363 product line delivers ruggedized surge protection and current-limiting controllers for high-reliability power systems operating in extreme voltage and temperature environments.
FAQ
What is the maximum input voltage the LT4363HDE-2#TR can withstand without damage?
The LT4363HDE-2#TR has an absolute maximum VCC rating of 100V and can survive reverse input voltages down to –60V without damage. Its normal operating range is 4V to 80V, and it is specifically designed to handle 100V transients such as automotive load dumps-verified in typical application circuits with 80V surges clamped to 27V at the output. This robustness is inherent to the LT4363HDE-2#TR's internal protection architecture.
How does the LT4363HDE-2#TR differ from the LT4363HDE-1#TRPBF in fault recovery behavior?
The LT4363HDE-2#TR implements auto-retry: after fault shutdown, it automatically restarts once the TMR capacitor discharges to 0.5V and the OV pin falls below 1.275V. In contrast, the LT4363HDE-1#TRPBF latches off permanently until the SHDN pin is pulsed low for ≥100µs. This fundamental difference makes the LT4363HDE-2#TR suitable for systems requiring autonomous recovery from transient overvoltage or overcurrent events.
Can the LT4363HDE-2#TR be used with back-to-back N-channel MOSFETs for reverse polarity protection?
Yes-the LT4363HDE-2#TR supports reverse input protection using back-to-back N-MOSFETs, enabled by its SHDN, UV, and OV pins being rated from –60V to 100V. This configuration eliminates the 0.3V–0.4V forward drop of Schottky diodes, improving efficiency and available output voltage. The LT4363HDE-2#TR's gate drive and fault timing remain fully functional in this topology, as confirmed in Analog Devices' application schematics for LT4363HDE-2#TR.
What is the purpose of the OV pin on the LT4363HDE-2#TR, and how should it be configured?
The OV pin on the LT4363HDE-2#TR is an overvoltage comparator input that inhibits auto-retry if its voltage exceeds 1.275V-preventing oscillation ("motorboating") during sustained input overvoltage. When unused, it must be tied to GND. If active monitoring is needed, connect a resistive divider from VCC to GND with tap to OV to set custom trip threshold. This function is exclusive to LT4363-2 variants like the LT4363HDE-2#TR and absent in LT4363-1 versions.
Does the LT4363HDE-2#TR require an external current sense resistor, and what is its typical value?
Yes-the LT4363HDE-2#TR requires an external current sense resistor between the SNS and OUT pins to implement overcurrent protection. With a nominal sense threshold of 50mV (reduced to 25mV during severe shorts), a 10mΩ resistor yields 5A current limit (50mV / 10mΩ = 5A). The resistor value is selected based on desired trip current and power dissipation; typical designs use 10mΩ to 50mΩ metal-strip resistors placed adjacent to the MOSFET source. This configuration is validated in the LT4363HDE-2#TR's reference schematic.
LT4363HDE-2#TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 12-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Clamping:
- Adjustable
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LT4363HDE-2#TR FAQ
1.How can I place an order for LT4363HDE-2#TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4363HDE-2#TR 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 LT4363HDE-2#TR reliable?
The price and inventory of LT4363HDE-2#TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4363HDE-2#TR is usually 5 days.
3.What payment methods are accepted for LT4363HDE-2#TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4363HDE-2#TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4363HDE-2#TR?
LT4363HDE-2#TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4363HDE-2#TR 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 LT4363HDE-2#TR?
For technical support, including LT4363HDE-2#TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4363HDE-2#TR requirements.
6.How does Aetrix verify that LT4363HDE-2#TR is sourced from the original manufacturer or authorized distributors?
All LT4363HDE-2#TR 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 LT4363HDE-2#TR meets industry standards.
7.What is the process for return or replacement of LT4363HDE-2#TR?
All LT4363HDE-2#TR units undergo pre-shipment inspection (PSI). If there is an issue with LT4363HDE-2#TR, 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 LT4363HDE-2#TR part is unused and in its original packaging.
Return procedure for LT4363HDE-2#TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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