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Analog Devices Inc. LTC4366HTS8-2#TRPBF
- Part No.:
- LTC4366HTS8-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC4366HTS8-2#TRPBF.pdf
- Description:
- IC SURGE STOPPER HV TSOT-23-8
- Quantity:
- Payment:
- Shipping:
Inventory:5,048
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Product details
Overview
LTC4366HTS8-2#TRPBF from Analog Devices is a high-voltage surge stopper IC that protects downstream loads by regulating output voltage during overvoltage transients using an external N-channel MOSFET. It features adjustable 43V output clamping, 9-second internal cool-down timer, auto-retry fault recovery, and operates across –40°C to 125°C. Used in 28V vehicle systems and high-voltage DC distribution where uninterrupted operation during transient surges up to 250V is required.
For engineers reviewing the LTC4366HTS8-2#TRPBF datasheet, LTC4366HTS8-2#TRPBF pinout, LTC4366HTS8-2#TRPBF application, or LTC4366HTS8-2#TRPBF equivalent, this page delivers verified functional specifications, validated TSOT-23-8 pin mapping, confirmed auto-retry behavior (LTC4366-2 variant), thermal rating for harsh environments, and real-world MOSFET gate drive timing under regulation.
Technical Context
The LTC4366HTS8-2#TRPBF implements a floating topology powered from the MOSFET source (OUT pin), enabling operation with input voltages exceeding 500V while isolating internal circuitry from surge stress. Its overvoltage regulation amplifier maintains FB pin at 1.23V below OUT, setting clamp voltage via RFB1/RFB2 divider.
During overvoltage, a 9µA current charges the TIMER pin; reaching 2.8V triggers fault shutdown and initiates 9-second cool-down. The LTC4366-2 variant auto-restarts after cool-down, unlike the latch-off LTC4366-1. GATE drive delivers up to 12V above OUT via integrated charge pump, with fast 200mA pull-down for transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Clamp | Adjustable to 43V - set by external resistor divider on FB pin; enables precise protection threshold tuning for 28V system compliance. |
| Operating Temp Range | –40°C to 125°C - qualified for automotive under-hood and avionic applications requiring extended thermal stability. |
| Cool-Down Timer | 9 seconds - prevents MOSFET thermal damage during sustained overvoltage; automatically resets for retry in LTC4366-2 variant. |
| GATE Drive Voltage | 12V above OUT - ensures full enhancement of high-threshold N-channel MOSFETs; supports low RDS(on) selection for minimal conduction loss. |
| Shutdown Current | <14µA - reduces system standby power; activated via SD pin pulled >1.5V below VDD for ≥700µs. |
| Package | 8-Lead TSOT-23 - compact surface-mount footprint with exposed pad option; θJA = 195°C/W for thermal-aware PCB layout. |
| FB Regulation Threshold | 1.23V below OUT - defines precision overvoltage sensing point; stable over full temperature range per datasheet Rev. F. |
Pinout & Package
8-Lead Plastic TSOT-23 package (top view); exposed pad optional for thermal enhancement or left open. Pin 1 = VDD, Pin 2 = SD, Pin 3 = TIMER, Pin 4 = VSS, Pin 5 = BASE, Pin 6 = FB, Pin 7 = OUT, Pin 8 = GATE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Start-up supply input | Provides 7.5µA gate-charge current during boot; clamped at 12V above VSS; not bypassed. |
| SD | Shutdown control input | Pulled up internally with 1.6µA; active-low trigger (>1.5V below VDD) enables ultra-low-IQ mode. |
| TIMER | Overvoltage duration timer input | Charged with 9µA; reaches 2.8V to initiate fault shutdown; capacitor sets regulation time (311ms/µF). |
| VSS | Device return and substrate | Reference for all voltages; return path for OUT, TIMER, and BASE capacitors; optional exposed pad connection. |
| BASE | PNP shunt regulator driver | Drives external PNP base to reduce RSS power dissipation; tied to VSS if unused. |
| FB | Overvoltage feedback input | Senses voltage drop across RFB1; regulates OUT by holding FB = OUT – 1.23V. |
| OUT | Floating supply rail | Power source for charge pump and regulation amplifier; clamped at 5.7V; requires ≥0.22µF bypass to VSS. |
| GATE | N-MOSFET gate driver output | Delivers 12V above OUT via charge pump; includes 200mA fast pull-down for rapid overvoltage response. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-retry fault recovery | LTC4366-2 variant clears 9-second cool-down timeout and restarts autonomously-no external reset required. |
| Floating architecture | Entire regulation circuit powered from OUT pin, enabling >500V input capability without internal pin stress. |
| Adjustable overvoltage timer | External capacitor on TIMER pin sets regulation duration (e.g., 100nF = 31ms), preventing MOSFET thermal runaway. |
| Low-quiescent shutdown | Reduces total IQ to <14µA-critical for always-on vehicle systems with strict battery drain limits. |
| Robust gate drive | Integrated 2MHz charge pump delivers 12V gate bias above source, ensuring reliable turn-on of high-VGS(th) MOSFETs. |
Applications
| 28V Vehicle Power Distribution | Avionic DC Bus Protection |
|---|---|
Use Scenario: Protecting flight control electronics from load dump and alternator surge in MIL-STD-704F-compliant 28V aircraft systems. IC Role / Device Role / Timing Role: Surge stopper regulating output at 43V during 250V/100ms transients; maintains uninterrupted power to critical avionics. Use Value: Eliminates need for bulky TVS diodes; enables use of cost-effective N-MOSFETs instead of expensive high-voltage SiC devices. |
Use Scenario: Securing navigation and communication subsystems against ESD-induced overvoltage in airborne radar platforms. IC Role / Device Role / Timing Role: Fast-response overvoltage protector with 60ns FB-to-GATE delay; clamps transients before downstream LDOs saturate. Use Value: Prevents brownout-induced system resets during lightning-induced surges; meets DO-160 Section 22 Level 3 requirements. |
| Industrial High-Voltage DC Links | Rugged Floating Topology Systems |
Use Scenario: Safeguarding PLC I/O modules connected to 400V DC industrial bus lines subject to switching transients. IC Role / Device Role / Timing Role: Adjustable clamp controller interfacing with discrete 600V N-MOSFET; sustains regulation for up to 31ms (via TIMER cap). Use Value: Extends MOSFET SOA margin by limiting conduction time during overvoltage-reducing thermal stress and improving field reliability. |
Use Scenario: Enabling isolated power delivery in high-side switch configurations where ground-referenced controllers cannot operate. IC Role / Device Role / Timing Role: Self-biasing surge protector powered from MOSFET source; operates with input referenced to floating potentials >500V. Use Value: Removes need for isolated DC-DC bias supplies; simplifies design of high-voltage motor drives and energy storage interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4366HTS8-1#TRPBF | Latches off after overvoltage fault; requires SD pin toggle to reset-no auto-retry. | Suitable for safety-critical systems requiring manual intervention before restart. | Select LTC4366HTS8-2#TRPBF when continuous operation after transient is mandatory; choose -1 variant only if fault latching is required by system architecture. |
| TPS26631RGER | Integrated 60V MOSFET; fixed 60V OVP threshold; no adjustable clamp or external MOSFET control. | Designed for lower-voltage USB PD and PoE applications-not rated for >500V floating operation. | Use TPS26631RGER only for ≤60V systems needing monolithic simplicity; LTC4366HTS8-2#TRPBF remains necessary for >250V surge handling and design flexibility. |
Compared with LTC4366HTS8-1#TRPBF, the LTC4366HTS8-2#TRPBF provides autonomous recovery after overvoltage events-critical for unattended systems-while both share identical thermal rating, pinout, and floating architecture. Versus TPS26631RGER, the LTC4366HTS8-2#TRPBF enables scalable high-voltage protection beyond 500V using discrete MOSFETs, but requires external component design effort.
Availability
LTC4366HTS8-2#TRPBF is available at Aetrix Electronics and suitable for 28V vehicle systems, avionic DC bus protection, and industrial high-voltage DC links requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4366HTS8-2#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 (now part of Analog Devices, Inc., a subsidiary of Analog Devices, Inc.) designs precision analog, mixed-signal, and digital signal processing ICs for high-reliability applications.
The LTC4366 product line delivers high-voltage surge protection ICs engineered for automotive, avionic, and industrial systems where robustness against load dump, alternator surge, and ESD transients is mission-critical.
FAQ
What is the key functional difference between LTC4366HTS8-2#TRPBF and LTC4366HTS8-1#TRPBF?
The LTC4366HTS8-2#TRPBF implements auto-retry behavior: after an overvoltage fault and 9-second cool-down, it automatically clears the fault and resumes operation. In contrast, the LTC4366HTS8-1#TRPBF latches off permanently until the SD pin is actively toggled low then high. Both share identical electrical specs, package, and temperature rating (–40°C to 125°C), making the -2 variant ideal for systems requiring uninterrupted uptime.
How does the LTC4366HTS8-2#TRPBF achieve operation with input voltages exceeding 500V?
The LTC4366HTS8-2#TRPBF uses a floating architecture: its core regulation circuitry-including the charge pump and overvoltage amplifier-is powered from the OUT pin, which connects to the MOSFET source. This isolates internal pins (VDD, FB, TIMER) from high input voltage stress. External resistors (RIN, RSS) and the MOSFET's breakdown rating determine the absolute maximum input, not the IC's pin ratings-enabling safe operation well above 500V when properly designed.
What is the role of the TIMER pin on the LTC4366HTS8-2#TRPBF, and how is it configured?
The TIMER pin on the LTC4366HTS8-2#TRPBF controls overvoltage regulation duration. During overvoltage, a 9µA current charges an external capacitor (CT) connected to TIMER and VSS. When TIMER voltage reaches 2.8V, the IC shuts off the MOSFET and starts the 9-second cool-down. CT value sets regulation time: CT = 3.2 nF/ms × desired time. Leaving TIMER open defaults to 1µs regulation-suitable only for very fast transients.
Can the LTC4366HTS8-2#TRPBF be used with P-channel MOSFETs?
No-the LTC4366HTS8-2#TRPBF is specifically designed to drive external N-channel MOSFETs in high-side configuration. Its GATE output sources current relative to OUT (not VSS), providing up to 12V above the MOSFET source to fully enhance N-channel devices. Driving a P-channel MOSFET would require reverse polarity gate control and is not supported by the internal charge pump, amplifier, or pin functions described in the datasheet.
What is the minimum recommended input voltage for reliable startup of the LTC4366HTS8-2#TRPBF?
Minimum startup voltage for the LTC4366HTS8-2#TRPBF depends on external resistor values (RIN, RSS), MOSFET threshold (VTH), Schottky diode drop (~0.58V), and UVLO2 threshold (4.75V). Per datasheet Rev. F, VIN(MIN) ≈ (9µA × RIN) + 0.58V + VTH + 4.75V + (45µA × RSS). For typical 324kΩ RIN and 46.4kΩ RSS, VIN(MIN) is ~18V-ensuring C1 charges to 4.75V before charge pump activation and stable regulation.
LTC4366HTS8-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Clamping:
- Adjustable
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC4366HTS8-2#TRPBF FAQ
1.How can I place an order for LTC4366HTS8-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4366HTS8-2#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 LTC4366HTS8-2#TRPBF reliable?
The price and inventory of LTC4366HTS8-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4366HTS8-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4366HTS8-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4366HTS8-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4366HTS8-2#TRPBF?
LTC4366HTS8-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4366HTS8-2#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 LTC4366HTS8-2#TRPBF?
For technical support, including LTC4366HTS8-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4366HTS8-2#TRPBF requirements.
6.How does Aetrix verify that LTC4366HTS8-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4366HTS8-2#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 LTC4366HTS8-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4366HTS8-2#TRPBF?
All LTC4366HTS8-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4366HTS8-2#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 LTC4366HTS8-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4366HTS8-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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