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Analog Devices Inc. LTC4366HTS8-2#TRMPBF
- Part No.:
- LTC4366HTS8-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC4366HTS8-2#TRMPBF.pdf
- Description:
- IC SURGE STOPPER HV TSOT-23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,926
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Product details
Overview
LTC4366HTS8-2#TRMPBF 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 >500V. It features adjustable overvoltage clamping (via FB divider), 9-second internal cool-down timer, auto-retry fault recovery, and operates across –40°C to 125°C. Used in 28V vehicle systems to maintain uninterrupted load operation while dropping surge energy across the MOSFET.
For engineers reviewing the LTC4366HTS8-2#TRMPBF datasheet, LTC4366HTS8-2#TRMPBF pinout, LTC4366HTS8-2#TRMPBF application, or LTC4366HTS8-2#TRMPBF equivalent, key selection criteria include its floating topology support, 1.23V FB regulation threshold, 12V GATE drive above OUT, shutdown IQ < 14µA, and TSOT-23 package compatibility with high-voltage DC distribution designs.
Technical Context
The LTC4366HTS8-2#TRMPBF implements a floating architecture where critical circuitry (charge pump, overvoltage amplifier) is powered from the OUT pin-enabling operation with input voltages exceeding 500V, limited only by external MOSFET and resistor ratings. Its regulation loop compares FB voltage to a precise 1.23V reference referenced to OUT, enabling accurate clamp setting independent of absolute supply level.
It integrates dual shunt regulators (12V on VDD, 5.7V on OUT), a 9µA TIMER pin current source, and a 200mA fast GATE pull-down for transient response. The -2 variant auto-retries after a 9-second cool-down period following overvoltage fault latching, distinguishing it from the latch-off -1 version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Regulation Threshold | 1.23V below OUT at FB pin - sets precise output clamp voltage via external resistor divider |
| GATE Drive Voltage | 12V above OUT - fully enhances high-side N-MOSFETs with sufficient gate overdrive for low RDS(on) |
| Cool-Down Timer | 9 seconds (typical) - prevents MOSFET thermal runaway by enforcing minimum off-time after overvoltage fault |
| Shutdown Quiescent Current | <14µA - enables ultra-low-power standby in battery-backed or always-on 28V avionic systems |
| Operating Temperature Range | –40°C to +125°C - qualified for under-hood automotive and industrial high-temp environments |
| Package | 8-lead TSOT-23 - surface-mount footprint with exposed pad option; θJA = 195°C/W for thermal design in compact enclosures |
| Supply Voltage Range (VDD) | 4.5V to 12V - powers startup logic and timer; clamped internally to prevent damage during transients |
Pinout & Package
Package: 8-lead plastic TSOT-23 with optional exposed pad (connected to VSS for improved thermal performance). Pin 1 marked; pinout matches standard TSOT-23 orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Start-up supply input | Provides 7.5µA gate-charge current during boot; clamped to 12V above VSS to survive high-voltage surges |
| SD | Shutdown control input | Active-low enable; requires >1.5V drop below VDD for ≥700µs to enter sub-20µA shutdown state |
| TIMER | Overvoltage duration timing node | Charged at 9µA; fault triggers when voltage reaches 2.8V - sets clamp time via external capacitor (CT = 3.2nF/ms) |
| VSS | Device return and substrate | Reference for all internal regulators; bypass capacitors for OUT and TIMER must connect here |
| GATE | N-MOSFET gate driver output | Drives external FET gate 12V above OUT; includes 200mA pull-down for fast turn-off during overvoltage events |
| OUT | Floating supply rail | Power source for charge pump and regulation amplifier; clamped to 5.7V; requires ≥0.22µF bypass to VSS |
| FB | Overvoltage feedback input | Senses voltage drop across upper divider resistor; regulates OUT by holding FB = OUT – 1.23V |
| BASE | External PNP base driver | Enables low-current shunt regulation using external PNP transistor to reduce power dissipation in RSS resistor |
Key Features
| Feature | Design Value |
|---|---|
| Floating topology support | Enables >500V input operation by powering regulation circuitry from OUT, isolating IC pins from surge voltage |
| Auto-retry fault recovery | LTC4366HTS8-2#TRMPBF automatically restarts after 9-second cool-down - eliminates manual reset in remote or sealed systems |
| Adjustable overvoltage clamp | Output regulated at user-defined voltage (e.g., 43V) via precision 1.23V FB reference and external resistor divider |
| Low-quiescent shutdown | Reduces total supply current to <14µA - extends battery life in always-on vehicle monitoring modules |
| Integrated dual shunt regulators | 12V regulator on VDD and 5.7V regulator on OUT provide stable internal rails regardless of input surge magnitude |
Applications
| 28V Vehicle Power Distribution | Avionic DC Bus Protection |
|---|---|
Use Scenario: Protecting flight control electronics from 250V lightning-induced transients on 28V DC bus. IC Role / Device Role / Timing Role: Surge stopper regulating output at 43V while dropping excess voltage across external MOSFET during transient. Use Value: Maintains uninterrupted operation of critical avionics without system reset; 9-second cool-down prevents MOSFET thermal failure. |
Use Scenario: Safeguarding navigation computers against load dump spikes in military aircraft power systems. IC Role / Device Role / Timing Role: Controls high-voltage N-MOSFET to clamp bus voltage and isolate downstream loads during >100V surges. Use Value: Enables rugged floating design where LTC4366HTS8-2#TRMPBF's OUT-powered architecture withstands input beyond 500V. |
| Industrial High-Voltage DC Networks | Ruggedized Test Equipment Power |
Use Scenario: Securing programmable logic controllers in factory automation systems fed from 300V DC microgrids. IC Role / Device Role / Timing Role: Acts as overvoltage protector with adjustable clamp set to 300V via FB divider; auto-retry ensures self-healing after fault. Use Value: Eliminates need for manual intervention after surge events; wide –40°C to +125°C range supports uncooled cabinet deployment. |
Use Scenario: Providing clean, surge-immune 24V supply to handheld test instruments used near high-energy electrical infrastructure. IC Role / Device Role / Timing Role: Regulates output during ESD or switching transient on input; shutdown pin enables battery-saver mode between measurements. Use Value: Sub-14µA shutdown current extends lithium battery life; TSOT-23 package allows integration into space-constrained handheld form factors. |
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#TRMPBF | Latches off permanently after overvoltage fault; requires SD pin toggle to reset | Suitable for safety-critical systems requiring manual confirmation before restart | Select LTC4366HTS8-1#TRMPBF only if fault persistence and operator intervention are required. |
| TPS26631RTJT | Integrated 60V MOSFET; fixed 36V overvoltage clamp; no adjustable FB or external MOSFET control | Better for lower-voltage (<60V), space-constrained designs where external FET is undesirable | Choose TPS26631RTJT when board area is limited and input voltage stays below 60V; LTC4366HTS8-2#TRMPBF remains superior for >100V and field-adjustable clamping. |
Compared with LTC4366HTS8-1#TRMPBF, the LTC4366HTS8-2#TRMPBF offers autonomous recovery ideal for inaccessible or remote installations; versus TPS26631RTJT, it delivers scalable high-voltage resilience (>500V) and design flexibility via external MOSFET selection and programmable clamp voltage.
Availability
LTC4366HTS8-2#TRMPBF is available at Aetrix Electronics and suitable for 28V vehicle systems, avionic DC bus protection, and industrial high-voltage DC networks requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4366HTS8-2#TRMPBF 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 LTC4366 product line delivers high-voltage surge protection ICs designed specifically for rugged floating topologies in automotive, avionic, and industrial power distribution systems where reliability under extreme transients is mandatory.
FAQ
What is the key functional difference between LTC4366HTS8-2#TRMPBF and LTC4366HTS8-1#TRMPBF?
The LTC4366HTS8-2#TRMPBF implements auto-retry behavior: after an overvoltage fault, it enters a 9-second cool-down period and then automatically resumes normal operation. In contrast, the LTC4366HTS8-1#TRMPBF latches off permanently and requires the SD pin to be toggled low-then-high to clear the fault and restart. This makes the -2 variant ideal for unattended or remote deployments where manual reset is impractical.
How does LTC4366HTS8-2#TRMPBF achieve operation with input voltages exceeding 500V?
The LTC4366HTS8-2#TRMPBF uses a floating architecture: its core regulation circuitry-including the charge pump and overvoltage amplifier-is powered from the OUT pin, not the input (VIN). Since OUT tracks VIN minus MOSFET drop, the IC's internal nodes never see the full input surge voltage. Instead, only external components (MOSFET, RSS, RIN) must be rated for high voltage-enabling safe operation up to >500V when properly implemented.
What is the role of the BASE pin on LTC4366HTS8-2#TRMPBF, and when should it be used?
The BASE pin on LTC4366HTS8-2#TRMPBF drives the base of an external PNP transistor to create a low-current shunt path for the RSS resistor. It is used when the power dissipation in RSS would otherwise be excessive-e.g., in high-regulation-voltage applications like 300V clamping. Connecting an external PNP reduces required RSS wattage by shifting most current through the transistor's collector-emitter path, leveraging the LTC4366HTS8-2#TRMPBF's internal 6.2V Zener and BASE drive capability.
Can LTC4366HTS8-2#TRMPBF be used with P-channel MOSFETs?
No, LTC4366HTS8-2#TRMPBF is designed exclusively for N-channel MOSFETs configured as high-side switches. Its GATE driver outputs a voltage 12V above OUT to ensure full enhancement of the N-MOSFET's gate-source voltage-even when OUT rises during overvoltage. Driving a P-channel device would require inversion and negative gate drive relative to source, which the LTC4366HTS8-2#TRMPBF does not support. Use only N-channel MOSFETs with appropriate voltage and SOA ratings.
What is the minimum input voltage required for reliable startup of LTC4366HTS8-2#TRMPBF?
The minimum startup voltage for LTC4366HTS8-2#TRMPBF depends on external component values but is typically ~12V–15V for standard configurations. Startup requires sufficient voltage across RIN to generate >9µA VDD current (IVDD(STHI)), plus enough headroom to charge C1 to the UVLO2 threshold of 4.75V. With typical RIN = 324kΩ and RSS = 46.4kΩ, the calculated minimum VIN is approximately 13.2V-accounting for Schottky drop (~0.58V), MOSFET VTH, and bias currents. Lower values risk incomplete startup and MOSFET overheating.
LTC4366HTS8-2#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC4366HTS8-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4366HTS8-2#TRMPBF 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#TRMPBF reliable?
The price and inventory of LTC4366HTS8-2#TRMPBF 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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4366HTS8-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4366HTS8-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4366HTS8-2#TRMPBF?
LTC4366HTS8-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4366HTS8-2#TRMPBF 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#TRMPBF?
For technical support, including LTC4366HTS8-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4366HTS8-2#TRMPBF requirements.
6.How does Aetrix verify that LTC4366HTS8-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4366HTS8-2#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4366HTS8-2#TRMPBF?
All LTC4366HTS8-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4366HTS8-2#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4366HTS8-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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