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Analog Devices Inc. LTC4366HTS8-1#TRMPBF
- Part No.:
- LTC4366HTS8-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC4366HTS8-1#TRMPBF.pdf
- Description:
- IC SURGE STOPPER HV TSOT-23-8
- Quantity:
- Payment:
- Shipping:
Inventory:854
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Product details
Overview
LTC4366HTS8-1#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 43V output clamping, 9-second internal cool-down timer, latch-off fault behavior (–1 version), and operates across –40°C to 125°C. Used in 28V vehicle systems and high-voltage DC distribution.
For engineers reviewing the LTC4366HTS8-1#TRMPBF datasheet, LTC4366HTS8-1#TRMPBF pinout, LTC4366HTS8-1#TRMPBF application, or LTC4366HTS8-1#TRMPBF equivalent, key selection criteria include overvoltage clamp adjustability via FB divider, TIMER pin programmable regulation timeout, shutdown quiescent current <14µA, and TSOT-23 package compatibility with floating high-side topologies.
Technical Context
The LTC4366HTS8-1#TRMPBF implements a floating architecture where OUT powers internal circuitry-including the 2MHz charge pump and overvoltage regulation amplifier-enabling operation with input voltages far exceeding its own pin ratings. Its regulation loop compares FB voltage to a 1.23V reference referenced to OUT, enabling precise clamping independent of absolute ground potential.
It uses dual shunt regulators: a 12V VDD clamp and a 5.7V OUT clamp, both powered through external resistors (RIN, RSS) to isolate internal circuitry from transients. The TIMER pin integrates a 9µA current source charging an external capacitor to set overvoltage regulation duration before latching off; the –1 variant requires SD pin toggle to reset after fault.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to +125°C (H-grade); enables use in under-hood automotive and avionic environments. |
| Overvoltage Clamp | Adjustable via FB resistor divider; typical 43V clamping point demonstrated in application circuits. |
| Cool-Down Timer | Fixed 9-second internal timer after overvoltage fault; prevents MOSFET thermal runaway during sustained surges. |
| Shutdown Current | <14µA total quiescent current (IVDD + IOUT); supports low-power always-on system monitoring. |
| Package | 8-Lead TSOT-23; compact footprint with exposed pad option; θJA = 195°C/W for thermal design in space-constrained layouts. |
| Fault Behavior | Latch-off (–1 version); requires SD pin transition to clear fault-ensures deliberate recovery after critical overvoltage event. |
| GATE Drive Capability | Charges external N-MOSFET gate to 12V above OUT via integrated charge pump; supports low-RDS(on) FET selection for minimal conduction loss. |
Pinout & Package
Package: 8-Lead Plastic TSOT-23 (TS8), RoHS-compliant, exposed pad optional (connected to VSS for thermal enhancement).
| 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; falling edge >1.5V below VDD (700µs filtered) activates <14µA shutdown mode. |
| TIMER | Overvoltage regulation timeout setting | Charged with 9µA; reaches 2.8V threshold to trigger fault; capacitor value sets regulation window (311ms/µF). |
| VSS | Device return and substrate | Reference for all internal regulators; return path for OUT, TIMER, and BASE capacitors; exposed pad connection improves thermal performance. |
| BASE | External PNP base driver | Drives PNP emitter follower to reduce RSS power dissipation in high-voltage applications; tied to VSS if unused. |
| FB | Overvoltage regulation feedback | Senses voltage drop across RFB1; regulates OUT so FB = OUT – 1.23V; sets precise clamping point. |
| OUT | Floating supply rail | Power source for charge pump and regulation amplifier; clamped at 5.7V; requires ≥0.22µF bypass to VSS. |
| GATE | External N-MOSFET gate driver | Driven to 12V above OUT; includes 200mA fast-discharge path during overvoltage; clamped to 12V above OUT. |
Key Features
| Feature | Design Value |
|---|---|
| Rugged floating topology | Enables operation with input voltages >500V by powering regulation circuitry from OUT, isolating internal logic from surge stress. |
| Adjustable overvoltage protection | Clamp voltage set precisely via FB resistor divider (e.g., 43V in typical app); eliminates need for fixed-voltage protectors. |
| Programmable regulation timer | TIMER pin accepts external capacitor to define overvoltage regulation window (e.g., 100ms to seconds), preventing MOSFET thermal damage. |
| Integrated 9-second cool-down | Hardwired timer forces minimum recovery interval after fault-ensures MOSFET thermal stabilization before retry. |
| Low-quiescent shutdown | SD-triggered mode draws <14µA total (IVDD + IOUT), supporting battery-backed or energy-harvesting system monitoring. |
Applications
| 28V Vehicle Systems | High-Voltage DC Distribution |
|---|---|
|
Use Scenario: Protection of infotainment, ADAS, and body control modules against load dump and alternator surge in commercial vehicles. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET as high-side switch; regulates output during 100V+ transients without interrupting load operation. Use Value: Maintains uninterrupted power to safety-critical ECUs while dropping >200V surges across the MOSFET-enabled by floating OUT supply and 43V clamp configuration. |
Use Scenario: Input protection for industrial 48V–300V DC power distribution networks feeding PLCs, motor drives, and sensors. IC Role / Device Role / Timing Role: High-voltage transient regulator using external MOSFET and RSS/RIN bias network; supports >500V operating range via resistor-based floating supply. Use Value: Eliminates need for high-voltage-rated ICs-internal circuitry operates from clamped 5.7V OUT rail, enabling cost-effective protection at extreme input voltages. |
| Avionic Power Conditioning | Rugged Industrial Control |
|
Use Scenario: Protecting flight-critical avionics from induced transients on 270VDC aircraft power buses during lightning strike events. IC Role / Device Role / Timing Role: Latch-off overvoltage protector (–1 version) ensuring controlled system reset after fault; H-grade temp range supports wide ambient operation. Use Value: Prevents uncontrolled re-engagement during persistent faults-SD pin reset requirement enforces pilot/operator verification before resuming power delivery. |
Use Scenario: Securing programmable logic controllers and I/O modules in factory automation against ESD and switching surges on long cable runs. IC Role / Device Role / Timing Role: Adjustable clamp controller interfacing with discrete N-MOSFET and external PNP (via BASE pin) to minimize RSS resistor size and power rating. Use Value: Reduces PCB area and thermal management burden-external PNP allows RSS values 35× larger than standard design, cutting power dissipation by >97%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4366HTS8-2#TRMPBF | Auto-retry fault behavior (9s cool-down then restart) vs. latch-off; identical pinout, specs, and package. | Suitable where automatic recovery is acceptable; not appropriate for safety-critical systems requiring manual reset confirmation. | Select LTC4366HTS8-2#TRMPBF only when continuous availability outweighs controlled fault response requirements. |
| LTC4367HTS8-1#TRMPBF | Includes undervoltage lockout (UVLO) and reverse polarity protection; same H-grade temp range and TSOT-23 package. | Required in systems needing bidirectional fault coverage (overvoltage + undervoltage + reverse input); adds complexity and BOM count. | Choose LTC4367HTS8-1#TRMPBF when UVLO or reverse polarity risk exists-LTC4366HTS8-1#TRMPBF provides dedicated overvoltage-only protection with lower system overhead. |
Compared with LTC4366HTS8-2#TRMPBF, the LTC4366HTS8-1#TRMPBF ensures deterministic fault isolation via latch-off behavior, while LTC4367HTS8-1#TRMPBF extends protection scope at the cost of added functionality not needed in pure overvoltage scenarios.
Availability
LTC4366HTS8-1#TRMPBF is available at Aetrix Electronics and suitable for 28V vehicle systems, avionic power conditioning, and high-voltage DC distribution requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4366HTS8-1#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. 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 delivers high-voltage surge protection ICs designed specifically for floating, high-reliability power path control-enabling robust overvoltage resilience in harsh environments without custom discrete solutions.
FAQ
What is the key functional difference between LTC4366HTS8-1#TRMPBF and LTC4366HTS8-2#TRMPBF?
The LTC4366HTS8-1#TRMPBF features latch-off fault behavior: once an overvoltage event triggers shutdown, it remains off until the SD pin is actively toggled. In contrast, the LTC4366HTS8-2#TRMPBF auto-retries after a fixed 9-second cool-down period. Both share identical electrical specifications, pinout, and TSOT-23 packaging-only fault recovery logic differs.
How does the LTC4366HTS8-1#TRMPBF achieve operation with input voltages exceeding 500V?
The LTC4366HTS8-1#TRMPBF achieves >500V operation via a floating architecture: its internal regulation amplifier and charge pump are powered from the OUT pin, which is referenced to the MOSFET source-not ground. External resistors (RIN, RSS) establish shunt-regulated rails (12V at VDD, 5.7V at OUT), isolating internal circuitry from input transients while enabling clamping at user-defined voltages like 43V.
What is the role of the BASE pin on the LTC4366HTS8-1#TRMPBF, and when should it be used?
The BASE pin on the LTC4366HTS8-1#TRMPBF drives the base of an external PNP transistor to reduce power dissipation in the RSS resistor. When high input voltages demand large RSS values for thermal safety, connecting a PNP emitter-follower (collector grounded, emitter to VSS) allows RSS to be increased up to 35×-cutting power loss significantly. Tie BASE to VSS if unused.
Can the overvoltage clamp voltage of the LTC4366HTS8-1#TRMPBF be adjusted, and how is it set?
Yes, the overvoltage clamp voltage of the LTC4366HTS8-1#TRMPBF is fully adjustable via an external resistor divider from OUT to ground, connected to the FB pin. The regulation amplifier maintains FB = OUT – 1.23V; thus, clamp voltage VCLAMP = 1.23V × (1 + RFB1/RFB2). For example, RFB1 = 12.4kΩ and RFB2 = 422kΩ yields ~43V clamping-verified in the typical application circuit.
What thermal considerations apply to the LTC4366HTS8-1#TRMPBF in TSOT-23 packaging?
The LTC4366HTS8-1#TRMPBF in TSOT-23 has θJA = 195°C/W (no exposed pad soldering). To maintain safe junction temperature in high-ambient or high-power applications, designers must limit power dissipation-primarily during overvoltage regulation-and ensure adequate copper area under the exposed pad (if used) connected to VSS. Thermal simulation using worst-case 125°C ambient and 9-second fault pulses is recommended.
LTC4366HTS8-1#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
LTC4366HTS8-1#TRMPBF FAQ
1.How can I place an order for LTC4366HTS8-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4366HTS8-1#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 LTC4366HTS8-1#TRMPBF reliable?
The price and inventory of LTC4366HTS8-1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4366HTS8-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4366HTS8-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4366HTS8-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4366HTS8-1#TRMPBF?
LTC4366HTS8-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4366HTS8-1#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 LTC4366HTS8-1#TRMPBF?
For technical support, including LTC4366HTS8-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4366HTS8-1#TRMPBF requirements.
6.How does Aetrix verify that LTC4366HTS8-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4366HTS8-1#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 LTC4366HTS8-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4366HTS8-1#TRMPBF?
All LTC4366HTS8-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4366HTS8-1#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 LTC4366HTS8-1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4366HTS8-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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