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Analog Devices Inc. LTC4366CTS8-2#TRPBF
- Part No.:
- LTC4366CTS8-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC4366CTS8-2#TRPBF.pdf
- Description:
- IC SURGE STOPPER HV TSOT-23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,526
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Product details
Overview
LTC4366CTS8-2#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 overvoltage clamping (via FB divider), 9-second internal cool-down timer, auto-retry fault recovery, and operates across 9V to >500V input range. Used in 28V vehicle systems for uninterrupted operation during 250V surges.
For engineers reviewing the LTC4366CTS8-2#TRPBF datasheet, LTC4366CTS8-2#TRPBF pinout, LTC4366CTS8-2#TRPBF application, or LTC4366CTS8-2#TRPBF equivalent, this page delivers verified specifications, TSOT-23 package details, real-world timing behavior, thermal management guidance, and validated alternative parts for rugged DC distribution designs.
Technical Context
The LTC4366CTS8-2#TRPBF implements a floating topology where OUT powers internal circuitry-including a 2MHz charge pump-enabling operation up to 500V input while isolating surge energy from IC pins. Its overvoltage regulation amplifier maintains FB at 1.23V below OUT, enabling precise clamp voltage setting via RFB1/RFB2 ratio.
It uses dual shunt regulators: VDD clamped at 11.7V (±0.8V) and OUT clamped at 5.5V (±0.5V), with BASE providing 6.1V (±0.5V) reference for optional PNP shunt extension. The TIMER pin charges at 9µA to trigger fault after programmable delay; LTC4366CTS8-2#TRPBF auto-restarts after fixed 9s cool-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Clamp Accuracy | FB regulation threshold = 1.23V ±0.037V; sets output clamp voltage with ±2.5% tolerance via resistor divider. |
| Cool-Down Timer | Fixed 9-second internal timeout after overvoltage fault; enables automatic retry without external reset signal. |
| Supply Range (VDD) | 4.5V to 12V; powered by external supply during startup, then isolated during regulation to support >500V input. |
| GATE Drive Capability | Drives external N-MOSFET gate to 12V above OUT; includes 200mA fast-discharge path for rapid turn-off during faults. |
| Shutdown Quiescent Current | <14µA total (IVDD + IOUT); achieved by tying GATE to OUT and disabling charge pump and regulation amplifier. |
| Operating Temperature | 0°C to 70°C (C-grade); validated for industrial and automotive 28V system environments with no derating required. |
| Package Thermal Resistance | θJA = 195°C/W (TSOT-23); requires minimal PCB copper area for thermal management in continuous 1.5A applications. |
Pinout & Package
8-lead TSOT-23 plastic package (3.0mm × 1.7mm × 0.9mm), exposed pad optional for thermal relief. Pin 1 marked, top view as per datasheet Rev. F.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Startup supply input | Provides 7.5µA gate-charge current during startup; clamped at 11.7V to protect logic circuits from input surges. |
| SD | Shutdown control input | Active-low enable; pulled up internally with 1.6µA; requires ≥700µs low pulse to enter <14µA shutdown state. |
| TIMER | Overvoltage duration timer input | Charged at 9µA; fault triggered when voltage reaches 2.8V; open-circuit = 1µs regulation window; capacitor sets delay. |
| VSS | Device return and substrate | Reference for all voltages; bypass capacitors for TIMER and OUT must connect here; exposed pad may be tied to VSS. |
| GATE | N-MOSFET gate driver output | Drives external MOSFET gate; includes 200mA pull-down for fast turn-off; clamped 10–12V above OUT to prevent damage. |
| OUT | Floating supply rail | Power source for charge pump and regulation amplifier; clamped at 5.5V; requires ≥0.22µF bypass to VSS. |
| FB | Overvoltage feedback input | Senses voltage drop across RFB1; regulation amplifier holds OUT–FB = 1.23V ±0.037V to set precise clamp point. |
| BASE | External PNP base driver | Supplies ~0.8µA to PNP base; enables high-voltage RSS resistor reduction by shifting shunt current path externally. |
Key Features
| Feature | Design Value |
|---|---|
| Floating architecture | Enables operation with input voltages exceeding 500V by powering regulation circuitry from OUT instead of VIN. |
| Auto-retry fault recovery | LTC4366CTS8-2#TRPBF automatically clears overvoltage fault and restarts after 9-second cool-down-no manual reset needed. |
| Adjustable overvoltage clamp | Output regulated at user-defined voltage (e.g., 43V) via standard resistor divider on FB pin with <±2.5% accuracy. |
| Low-power shutdown mode | Reduces total quiescent current to <14µA, preserving battery life in always-on 28V vehicle systems during standby. |
| Robust gate drive protection | Integrated 200mA fast-discharge path and 12V gate-to-source clamp prevent MOSFET shoot-through and gate oxide failure. |
Applications
| 28V Vehicle Power Distribution | Avionic DC Bus Protection |
|---|---|
|
Use Scenario: Protecting avionics modules from load dump and alternator spikes in MIL-STD-704F-compliant 28V aircraft power systems. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET to clamp transients up to 250V while maintaining uninterrupted 1.5A load power. Use Value: Eliminates need for bulky TVS diodes and enables compact, thermally efficient protection with auto-recovery after transient events. |
Use Scenario: Safeguarding flight control computers and sensors against ESD-induced overvoltage in airborne equipment racks. IC Role / Device Role / Timing Role: Regulating output voltage during fast-rising surges (e.g., 100V/µs) using FB feedback loop with <300ns response time. Use Value: Maintains functional safety by preventing latch-up or brownout in critical systems during lightning-induced transients. |
| Industrial High-Voltage DC Links | Rugged Floating Topology Systems |
|
Use Scenario: Securing PLC I/O modules connected to unregulated 48–300V DC field buses subject to switching surges and cable coupling. IC Role / Device Role / Timing Role: Controlling high-side N-MOSFET to drop excess voltage across pass device during sustained overvoltage (e.g., 150V for 100ms). Use Value: Enables use of cost-effective MOSFETs instead of expensive high-voltage regulators while meeting IEC 61000-4-5 Level 4 immunity. |
Use Scenario: Isolating sensitive analog front-ends in high-side current sensing or isolated ADC bias supplies. IC Role / Device Role / Timing Role: Providing regulated, floating 5.5V rail referenced to MOSFET source-decoupled from noisy ground returns. Use Value: Improves measurement accuracy by eliminating ground loop noise and enabling true high-side sensing in >400V systems. |
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#TRPBF | Same functionality and pinout; rated for –40°C to 85°C industrial temperature range vs. 0°C to 70°C for LTC4366CTS8-2#TRPBF. | Required for extended ambient operation in engine bay or outdoor enclosures; identical electrical performance otherwise. | Select LTC4366ITS8-2#TRPBF when operating outside 0°C–70°C range; no layout or firmware changes needed. |
| LTC4366CDDB-2#TRPBF | Same electrical specs but in 3mm × 2mm DFN package (θJA = 75°C/W vs. 195°C/W); exposes thermal pad for improved heat dissipation. | Better suited for high-power or space-constrained layouts where lower thermal resistance justifies larger footprint. | Choose LTC4366CDDB-2#TRPBF for higher ambient temperatures or continuous 1.5A operation with minimal derating. |
Compared with LTC4366CTS8-2#TRPBF, the ITS8-2 variant extends temperature capability without changing design, while the CDDB-2 variant improves thermal performance at the cost of board area-both retain identical surge response, timing, and regulation accuracy.
Availability
LTC4366CTS8-2#TRPBF 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 across production lifecycles.
Supply support for LTC4366CTS8-2#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and aerospace markets.
The LTC4366 family was designed specifically for high-voltage surge protection in floating topologies-enabling reliable operation beyond 500V input while maintaining precision regulation and auto-recovery behavior in harsh environments.
FAQ
What is the key difference between LTC4366CTS8-2#TRPBF and LTC4366CTS8-1#TRPBF?
The LTC4366CTS8-2#TRPBF implements auto-retry fault recovery: after an overvoltage event, it enters a 9-second cool-down period and then automatically resumes operation. In contrast, the LTC4366CTS8-1#TRPBF latches off permanently until the SD pin is toggled low-then-high to clear the fault. This makes LTC4366CTS8-2#TRPBF ideal for unattended or remote systems where manual reset is impractical.
How does the LTC4366CTS8-2#TRPBF achieve operation up to >500V input?
The LTC4366CTS8-2#TRPBF achieves >500V operation through its floating architecture: internal circuitry-including the charge pump and regulation amplifier-is powered from the OUT pin (referenced to MOSFET source), not directly from VIN. This isolates sensitive pins (VDD, FB, TIMER) from high input voltage, limiting stress to only the external MOSFET and resistive dividers-enabling robust protection far beyond the IC's absolute maximum ratings.
What is the minimum input voltage required to start up the LTC4366CTS8-2#TRPBF?
The minimum startup voltage for LTC4366CTS8-2#TRPBF depends on resistor values and MOSFET threshold but is typically ≥18V. Using datasheet parameters (IVDD(STHI) = 9µA, IVSS(AMP) = 45µA, VD = 0.58V, VTH ≈ 3V, VC1 = 4.75V), VIN(MIN) ≈ (9µA × RIN) + 0.58V + 3V + 4.75V + (45µA × RSS). With typical RIN = 324kΩ and RSS = 46.4kΩ, calculated minimum is ~22.5V-verified in Figure 1's 28V application.
Can the LTC4366CTS8-2#TRPBF regulate output voltage precisely, and what determines accuracy?
Yes-the LTC4366CTS8-2#TRPBF regulates output voltage with high precision via its FB pin, which holds OUT–FB = 1.23V ±0.037V (±3%) over temperature. Total clamp accuracy depends on resistor tolerance (e.g., 0.5% RFB1/RFB2) and temperature coefficient; typical overall error is ±2.5% at 25°C, degrading to ±3.5% over full operating range. Layout parasitics and trace resistance also affect final accuracy.
Does the LTC4366CTS8-2#TRPBF require external components for basic operation?
Yes-LTC4366CTS8-2#TRPBF requires at minimum: an external N-channel MOSFET (e.g., IXTK90N25L2), FB resistive divider (RFB1/RFB2), TIMER capacitor (if adjustable delay needed), OUT bypass capacitor (≥0.22µF), and input dropping resistors (RIN, RSS). These components define clamp voltage, startup behavior, thermal limits, and surge energy handling-no internal compensation or regulation elements are omitted.
LTC4366CTS8-2#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
LTC4366CTS8-2#TRPBF FAQ
1.How can I place an order for LTC4366CTS8-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4366CTS8-2#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 LTC4366CTS8-2#TRPBF reliable?
The price and inventory of LTC4366CTS8-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4366CTS8-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4366CTS8-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4366CTS8-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4366CTS8-2#TRPBF?
LTC4366CTS8-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4366CTS8-2#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 LTC4366CTS8-2#TRPBF?
For technical support, including LTC4366CTS8-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4366CTS8-2#TRPBF requirements.
6.How does Aetrix verify that LTC4366CTS8-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4366CTS8-2#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 LTC4366CTS8-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4366CTS8-2#TRPBF?
All LTC4366CTS8-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4366CTS8-2#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 LTC4366CTS8-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4366CTS8-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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