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Analog Devices Inc. LTC4366CTS8-2#TRMPBF
- Part No.:
- LTC4366CTS8-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC4366CTS8-2#TRMPBF.pdf
- Description:
- IC SURGE STOPPER HV TSOT-23-8
- Quantity:
- Payment:
- Shipping:
Inventory:13,582
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Product details
Overview
LTC4366CTS8-2#TRMPBF from Analog Devices is a high-voltage surge stopper IC that protects downstream loads by regulating output voltage during overvoltage transients up to >500V using an external N-channel MOSFET. It features adjustable overvoltage clamping (via FB divider), 9-second auto-retry cool-down timer, shutdown current <14µA, and operates from 9V to >500V input. It is used in 28V vehicle systems requiring uninterrupted operation during transient surges.
For engineers reviewing the LTC4366CTS8-2#TRMPBF datasheet, LTC4366CTS8-2#TRMPBF pinout, LTC4366CTS8-2#TRMPBF application, or LTC4366CTS8-2#TRMPBF equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, confirmed thermal limits, and validated alternative options for rugged DC distribution designs.
Technical Context
The LTC4366CTS8-2#TRMPBF implements a floating topology where internal circuitry is powered from OUT (not VIN), enabling operation with input voltages far exceeding its own pin ratings - limited only by external MOSFET and resistor selection. Its overvoltage regulation amplifier maintains FB = OUT − 1.23V via gate control of the external N-MOSFET, while the TIMER pin charges at 9µA to trigger fault after programmable duration.
Unlike latch-off variants, the LTC4366CTS8-2#TRMPBF auto-retries after a fixed 9-second cool-down period following overvoltage fault, with no external reset required. Shutdown is activated when SD falls >1.5V below VDD for ≥700µs, reducing total quiescent current to <20µA (excluding shunt regulator currents).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Clamp Accuracy | FB regulation threshold = 1.23V ±0.037V (OUT − FB), enabling precise output voltage setting via RFB1/RFB2 ratio |
| Cool-Down Timer | Fixed 9-second internal timeout after overvoltage fault, allowing automatic recovery without host intervention |
| Shutdown Quiescent Current | <14µA total IVDD + IOUT, critical for battery-backed or low-power always-on systems |
| Operating Input Range | 9V to >500V VIN supported via floating architecture - device pins see only regulated internal rails (VDD ≤12V, OUT ≤5.7V) |
| Package & Temp Grade | 8-lead TSOT-23, commercial grade (0°C to 70°C), footprint-compatible with all LTC4366-2 variants |
| GATE Drive Capability | 200mA fast-discharge pull-down + charge pump delivering 12V above OUT, sufficient to drive large N-MOSFETs (e.g., IXTK90N25L2) |
| UVLO Thresholds | UVLO1 = 2.6V (OUT), UVLO2 = 4.75V (OUT) - ensures stable start-up and charge pump enablement before regulation |
Pinout & Package
8-lead TSOT-23 package (JEDEC MO-193AA), 3mm × 1.7mm body, 0.65mm pitch, exposed pad optional for thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Start-up supply input | Supplies 7.5µA gate-charge current; clamped to 12V above VSS - must not be bypassed |
| SD | Shutdown comparator input | Active-low control: pulled up internally with 1.6µA; triggers shutdown when >1.5V below VDD for ≥700µs |
| TIMER | Overvoltage duration timer input | Charged at 9µA; fault triggered when voltage reaches 2.8V; open = 1µs regulation window |
| VSS | Device return and substrate | Reference for all voltages; bypass capacitors for OUT and TIMER must connect here |
| GATE | N-MOSFET gate driver output | Drives external FET gate; includes 200mA pull-down for fast turn-off during overvoltage |
| OUT | Floating supply rail | Power source for internal charge pump and regulation amplifier; clamped to 5.7V above VSS |
| FB | Overvoltage feedback input | Senses voltage drop across RFB1; regulates OUT so OUT − FB = 1.23V ±0.037V |
| BASE | External PNP base driver | Connects to anode of internal 6.2V Zener; enables low-current shunt regulation with external PNP transistor |
Key Features
| Feature | Design Value |
|---|---|
| Floating architecture | Enables >500V input protection using standard 28V-rated MOSFETs and resistors - no special high-voltage IC required |
| Auto-retry fault recovery | LTC4366CTS8-2#TRMPBF automatically resumes operation after 9 seconds, eliminating need for manual reset or system-level intervention |
| Adjustable overvoltage clamp | Output voltage set precisely via external RFB1/RFB2 divider - e.g., 43V clamp achieved with 12.4kΩ/422kΩ (Figure TA01a) |
| Low-power shutdown mode | Reduces total supply current to <20µA, preserving battery life in always-connected automotive or avionic systems |
| Robust gate drive | Integrated 200mA pull-down and 12V charge-pump boost ensure reliable turn-off and full enhancement of high-side N-MOSFETs |
Applications
| 28V Vehicle Power Distribution | Avionic DC Bus Protection |
|---|---|
Use Scenario: Protecting flight control electronics from load dump or alternator surge in MIL-STD-704F-compliant 28V aircraft systems. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET to clamp output at 43V during 250V/100ms transients while maintaining uninterrupted power. Use Value: Enables use of cost-effective 60V MOSFETs instead of expensive 100V+ devices, with guaranteed 9-second thermal recovery between surges. |
Use Scenario: Safeguarding mission-critical sensors and communication modules against ESD-induced overvoltage on shared DC bus lines. IC Role / Device Role / Timing Role: Fast-response overvoltage regulator that activates within 150ns (tDLY–FAST) to limit FB excursion and prevent downstream latch-up. Use Value: Maintains continuous operation during short-duration transients (<1ms), avoiding system resets or data loss in real-time avionics. |
| Industrial High-Voltage DC Distribution | Rugged Floating Topology Systems |
Use Scenario: Protecting PLC I/O modules and motor drives fed from unregulated 300–400V DC microgrids subject to switching transients. IC Role / Device Role / Timing Role: Controls high-current N-MOSFET (e.g., IXTK90N25L2) to dissipate surge energy across FET while regulating output at 300V. Use Value: Eliminates need for bulky TVS arrays; leverages MOSFET SOA for controlled, repeatable energy absorption with self-cooling. |
Use Scenario: Isolating sensitive analog front-ends in high-side current sensing or isolated power monitoring circuits. IC Role / Device Role / Timing Role: Provides floating 5.7V regulated supply (OUT) referenced to MOSFET source, enabling accurate high-side measurements up to >500V. Use Value: Removes requirement for optocouplers or isolated DC/DC converters - simplifies BOM and improves long-term reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4366ITS8-2#TRMPBF | Same functionality and pinout; extended temperature range (–40°C to 85°C) vs. 0°C to 70°C | Required for under-hood automotive or outdoor industrial deployments where ambient exceeds 70°C | Select when operating environment exceeds commercial temperature grade limits; otherwise identical design-in. |
| LTC4366CDDB-2#TRMPBF | Same electrical specs; 3mm × 2mm DFN package vs. TSOT-23 - lower θJA (75°C/W with soldered VSS) | Better thermal performance in high-power or space-constrained layouts; requires different PCB footprint | Choose for improved thermal management in high-current (>1.5A) or compact form factor designs. |
Compared with LTC4366ITS8-2#TRMPBF and LTC4366CDDB-2#TRMPBF, the LTC4366CTS8-2#TRMPBF offers lowest-cost entry into the LTC4366-2 family with commercial-grade reliability, making it ideal for cost-sensitive 28V vehicle systems where ambient stays within 0°C–70°C and thermal dissipation is moderate.
Availability
LTC4366CTS8-2#TRMPBF is available at Aetrix Electronics and suitable for 28V vehicle systems, avionic DC bus protection, and industrial high-voltage DC distribution requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for LTC4366CTS8-2#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and aerospace markets.
The LTC4366 product line was designed specifically for high-voltage transient protection in floating topologies - enabling robust, MOSFET-based surge suppression in systems where input voltage far exceeds IC pin ratings.
FAQ
What is the key functional difference between LTC4366CTS8-2#TRMPBF and LTC4366CTS8-1#TRMPBF?
The LTC4366CTS8-2#TRMPBF implements auto-retry behavior after overvoltage fault, automatically restarting after a fixed 9-second cool-down period. In contrast, the LTC4366CTS8-1#TRMPBF latches off permanently until the SD pin is toggled externally. This makes the LTC4366CTS8-2#TRMPBF ideal for unattended or remote systems where manual reset is impractical.
How does the LTC4366CTS8-2#TRMPBF achieve >500V input capability despite having only 12V-rated pins?
The LTC4366CTS8-2#TRMPBF uses a floating architecture: its internal circuitry is powered from the OUT pin (clamped to 5.7V), not directly from VIN. The external N-MOSFET isolates high input voltage, allowing only regulated internal rails (VDD ≤12V, OUT ≤5.7V) to appear on IC pins - thus enabling >500V protection with standard components.
What is the minimum recommended value for the TIMER capacitor to achieve a 100ms overvoltage regulation window?
Using the formula CT = 3.2 • t (nF/ms), a 100ms regulation window requires CT = 320nF. For example, a 330nF capacitor yields ~103ms before TIMER reaches 2.8V and triggers fault. Values below 1nF result in sub-microsecond regulation - effectively disabling overvoltage protection.
Can the LTC4366CTS8-2#TRMPBF be used with P-channel MOSFETs?
No - the LTC4366CTS8-2#TRMPBF is explicitly designed to drive external N-channel MOSFETs in high-side configuration. Its GATE driver provides positive voltage relative to OUT (up to 12V above OUT) and includes a 200mA pull-down path. P-channel compatibility would require inverted logic and negative gate drive, which the LTC4366CTS8-2#TRMPBF does not support.
What happens to the GATE pin during shutdown mode of the LTC4366CTS8-2#TRMPBF?
During shutdown, the LTC4366CTS8-2#TRMPBF internally connects GATE to OUT via a switched resistor, forcing the external N-MOSFET into cutoff. This action eliminates leakage through the FET channel and reduces total system quiescent current to <20µA - excluding shunt regulator currents in VDD, OUT, and BASE.
LTC4366CTS8-2#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
LTC4366CTS8-2#TRMPBF FAQ
1.How can I place an order for LTC4366CTS8-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4366CTS8-2#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 LTC4366CTS8-2#TRMPBF reliable?
The price and inventory of LTC4366CTS8-2#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4366CTS8-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4366CTS8-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4366CTS8-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4366CTS8-2#TRMPBF?
LTC4366CTS8-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4366CTS8-2#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 LTC4366CTS8-2#TRMPBF?
For technical support, including LTC4366CTS8-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4366CTS8-2#TRMPBF requirements.
6.How does Aetrix verify that LTC4366CTS8-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4366CTS8-2#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 LTC4366CTS8-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4366CTS8-2#TRMPBF?
All LTC4366CTS8-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4366CTS8-2#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 LTC4366CTS8-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4366CTS8-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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