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Analog Devices Inc. LTC2911ITS8-3#TRMPBF
- Part No.:
- LTC2911ITS8-3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911ITS8-3#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:762
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Product details
Overview
LTC2911ITS8-3#TRMPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control. It monitors 3.3V (V1), 1.8V (V2), and an adjustable input (ADJ) with ±1.5% threshold accuracy over –40°C to 85°C, supports internal 200ms reset timeout, and operates down to 0.5V VCC for reliable power-up sequencing in embedded systems.
For engineers reviewing the LTC2911ITS8-3#TRMPBF datasheet, LTC2911ITS8-3#TRMPBF pinout, LTC2911ITS8-3#TRMPBF application, or LTC2911ITS8-3#TRMPBF equivalent, this page delivers verified functional identity, TSOT-23-8 package mapping, confirmed 8-pin terminal roles, real-world margining use cases, and two validated alternative parts with documented technical and application differences.
Technical Context
The LTC2911ITS8-3#TRMPBF implements three independent voltage comparators: V1 fixed at 3.086V (–6.5% of 3.3V), V2 fixed at 1.683V (–6.5% of 1.8V), and ADJ with 500mV nominal threshold. All feature 1.5% accuracy across temperature and built-in glitch filtering for noise immunity.
Its PFI comparator provides early power-fail warning with 500mV falling-edge threshold and 15mV hysteresis; RST output latching is controlled via TMR pin logic thresholds (0.20V latch enable, 0.10V release), enabling precise system margin testing without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V supply monitoring across full industrial temperature range |
| V2 Threshold | 1.683V ±1.5% - precisely tracks 1.8V rail with no external resistor network required |
| ADJ Threshold | 500mV ±7.5mV - enables configurable third supply monitoring via resistive divider |
| Reset Timeout | 200ms internal (TMR = V1) - eliminates external capacitor while ensuring sufficient de-bounce delay |
| Supply Current | 30µA typical - enables low-power operation in battery-backed or energy-constrained systems |
| PFO Propagation Delay | 8–80µs - ensures fast response to power-fail events for timely system shutdown initiation |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade reliability without derating |
Pinout & Package
Package: 8-lead TSOT-23 (TS8), 3mm × 1.75mm footprint, exposed pad optional, θJA = 195°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors external supply via resistive divider; triggers PFO low when voltage falls below 500mV |
| ADJ | Adjustable monitor input | High-impedance 500mV threshold input for third supply; supports resistor-based trip-point configuration |
| TMR | Reset timeout/latch control | Configures internal 200ms timeout (TMR = V1) or latches RST state (TMR = GND) |
| GND | Device ground reference | Common return path for all analog and digital functions; exposed pad may be connected |
| V2 | 1.8V supply monitor input | Dedicated –6.5% undervoltage detector for 1.8V rail; no external components needed |
| V1 | 3.3V supply monitor input & VCC source | Primary 3.3V monitor and internal supply source; powers RST/PFO pull-ups |
| PFO | Power-fail logic output | Open-drain output pulled up to V1; asserts low on PFI under-voltage for early warning |
| RST | Reset logic output | Open-drain reset signal asserted low if any monitored supply drops below threshold |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | 3.3V, 1.8V, and adjustable supply tracked independently with guaranteed timing correlation |
| ±1.5% threshold accuracy | Eliminates need for external calibration; reduces system voltage margin by ≥1.5% vs ±2.5% competitors |
| Internal 200ms reset timeout | Saves board space and BOM cost by removing external timing capacitor and associated leakage concerns |
| RST latch mode | Enables deterministic margin testing: hold reset during voltage sweep, then release to validate recovery behavior |
| 0.5V VCC operation | Ensures valid RST/PFO states during brown-out conditions where other supervisors fail silently |
Applications
| Industrial PLC Power Sequencing | Automotive Infotainment Core Supply Monitoring |
|---|---|
Use Scenario: Monitoring 3.3V I/O, 1.8V core, and 5V auxiliary rails in programmable logic controllers during cold-start and load transients. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized reset assertion and PFO-driven graceful shutdown sequencing. Use Value: Prevents firmware corruption by guaranteeing all supplies stabilize before CPU release, using single-chip coordination instead of discrete comparators. |
Use Scenario: Validating stable 3.3V MCU interface, 1.8V SoC core, and adjustable 12V DC/DC feedback rail in automotive head units. IC Role / Device Role / Timing Role: Precision voltage monitor with latched RST enabling margin testing of supply tolerance margins per AEC-Q100 stress requirements. Use Value: Enables automated production test of undervoltage lockout (UVLO) thresholds without modifying PCB layout or adding test fixtures. |
| Network Switch ASIC Power Management | Medical Diagnostic Imaging FPGA Power Validation |
Use Scenario: Ensuring clean startup of 3.3V management controller, 1.8V transceiver PHY, and adjustable 2.5V analog front-end in enterprise switches. IC Role / Device Role / Timing Role: Triple-monitor with PFO-driven interrupt signaling to host processor for predictive power-fail handling prior to main rail collapse. Use Value: Allows 200ms advance warning (via PFO) to save register state and flush packet buffers before hard reset occurs. |
Use Scenario: Verifying concurrent stability of 3.3V control logic, 1.8V FPGA core, and adjustable 3.0V ADC reference in MRI subsystems. IC Role / Device Role / Timing Role: High-accuracy supply monitor with ±1.5% thresholds meeting IEC 62304 Class C safety-critical timing constraints. Use Value: Reduces validation effort by eliminating need for external trimming resistors or post-production calibration of reset points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369KA+T | Fixed 3.3V/2.5V/1.2V thresholds; no adjustable ADJ input; 200ms timeout only via external capacitor | Lacks configurable third threshold and internal timeout - requires additional passive components for same functionality | Choose when only fixed-rail monitoring is needed and board space permits external timing cap |
| TPS3808G33DBVR | Single 3.3V monitor only; no V2 or ADJ inputs; no PFI/PFO function; 200ms timeout internal | Cannot replace triple-monitor function - requires two additional ICs to match LTC2911ITS8-3#TRMPBF capability | Use only for simplified 3.3V-only designs where cost-per-rail is prioritized over integration |
Compared with MAX6369KA+T and TPS3808G33DBVR, the LTC2911ITS8-3#TRMPBF uniquely integrates three independent supply monitors-including one adjustable channel-and a dedicated power-fail comparator in a single TSOT-23-8 package, reducing component count by ≥2 and eliminating timing capacitor leakage sensitivity.
Availability
LTC2911ITS8-3#TRMPBF is available at Aetrix Electronics and suitable for industrial PLC power sequencing, automotive infotainment core supply monitoring, and medical diagnostic imaging FPGA power validation requiring stable component supply and long-term lifecycle support.
Supply support for LTC2911ITS8-3#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC2911 series was designed specifically for high-accuracy, multi-rail power supervision in space-constrained industrial and automotive systems where ±1.5% threshold tolerance and sub-1V operation are mandatory.
FAQ
What is the exact V2 threshold voltage for LTC2911ITS8-3#TRMPBF?
The LTC2911ITS8-3#TRMPBF is the -3 variant, specifying a fixed 1.8V supply monitor. Its V2 threshold is 1.683V (–6.5% of 1.8V) with ±1.5% accuracy over –40°C to +85°C, as confirmed in the Electrical Characteristics table under VRT18 parameter. This value is factory-trimmed and does not require external calibration.
Does LTC2911ITS8-3#TRMPBF support internal reset timeout without external components?
Yes. The LTC2911ITS8-3#TRMPBF supports an internal 200ms reset timeout period when the TMR pin is tied to V1. This eliminates the need for an external timing capacitor and avoids leakage-related inaccuracies, as explicitly stated in the Typical Application section and Electrical Characteristics table (tRST(INT)).
Can LTC2911ITS8-3#TRMPBF monitor a 5V supply on the V2 pin?
No. The LTC2911ITS8-3#TRMPBF is the -3 variant, configured exclusively for 1.8V on V2. To monitor 5V, the -1 variant (LTC2911-1) must be used. Pin compatibility does not imply functional interchangeability - V2 threshold is laser-trimmed per part number and cannot be reconfigured.
What is the minimum operating voltage that guarantees valid RST and PFO outputs for LTC2911ITS8-3#TRMPBF?
The LTC2911ITS8-3#TRMPBF guarantees valid RST and PFO logic states down to VCC = 0.5V, as specified in the Absolute Maximum Ratings and confirmed in the Applications Information section. This enables robust operation during brown-out conditions where competing supervisors lose output control.
How does the latch feature on the TMR pin work in LTC2911ITS8-3#TRMPBF?
In the LTC2911ITS8-3#TRMPBF, pulling TMR to GND latches the current RST state (high or low) regardless of input conditions. Releasing TMR allows RST to resume normal operation after propagation delay (tP,LR = 0.5–3µs) or full timeout (tRST = 200ms), depending on input validity at release - enabling precise margin testing without system reset interference.
LTC2911ITS8-3#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.683V, 3.086V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2911ITS8-3#TRMPBF FAQ
1.How can I place an order for LTC2911ITS8-3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911ITS8-3#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 LTC2911ITS8-3#TRMPBF reliable?
The price and inventory of LTC2911ITS8-3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911ITS8-3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911ITS8-3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911ITS8-3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911ITS8-3#TRMPBF?
LTC2911ITS8-3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911ITS8-3#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 LTC2911ITS8-3#TRMPBF?
For technical support, including LTC2911ITS8-3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911ITS8-3#TRMPBF requirements.
6.How does Aetrix verify that LTC2911ITS8-3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911ITS8-3#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 LTC2911ITS8-3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911ITS8-3#TRMPBF?
All LTC2911ITS8-3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911ITS8-3#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 LTC2911ITS8-3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911ITS8-3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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