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Analog Devices Inc. LTC2911CTS8-1#TRMPBF
- Part No.:
- LTC2911CTS8-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911CTS8-1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:453
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Product details
Overview
LTC2911CTS8-1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control, designed for reliable system supervision in space-constrained applications. It monitors 3.3V (V1), 5V (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 - enabling robust power sequencing in desktop computers and industrial controllers.
For engineers reviewing the LTC2911CTS8-1#TRMPBF datasheet, LTC2911CTS8-1#TRMPBF pinout, LTC2911CTS8-1#TRMPBF application, or LTC2911CTS8-1#TRMPBF equivalent, this page delivers verified functional identity, TSOT-23-8 package mapping, confirmed 3.086V/4.675V/0.5V thresholds, glitch-immune timing behavior, and two validated alternative parts for supply monitoring designs requiring tight voltage tolerance and early power-fail warning.
Technical Context
The LTC2911CTS8-1#TRMPBF implements three independent comparators: V1 (3.3V fixed), V2 (5V fixed per -1 variant), and ADJ (0.5V nominal threshold), all featuring ±1.5% accuracy across temperature and built-in input glitch filtering. Its internal VCC is derived from the higher of V1 or V2, enabling operation even when one supply is absent.
It integrates a dedicated PFI/PFO path with 500mV falling-edge threshold and 15mV hysteresis for early power-fail detection, plus TMR-controlled latch mode that holds RST low during margin testing - eliminating spurious resets without external logic or microcontroller intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V (–6.5% of 3.3V); guarantees reset assertion before 3.3V supply falls below system operational minimum. |
| V2 Threshold | 4.675V (–6.5% of 5V); precise trip point for 5V rail monitoring in multi-rail systems like network servers. |
| ADJ Threshold | 500mV ±7.5mV; enables configurable third-supply monitoring via resistive divider (e.g., 12V, 24V, or battery stack). |
| Reset Timeout | 200ms (internal); eliminates need for external timing capacitor in standard configurations, reducing BOM count. |
| Supply Current | 30µA typical at 25°C; enables always-on supervision in low-power embedded systems without significant load impact. |
| PFI Threshold Hysteresis | 15mV (3% of 500mV); prevents chatter on noisy power rails during brownout recovery. |
| Operating Temp Range | –40°C to +85°C (I-grade); qualified for industrial and automotive under-hood electronics environments. |
Pinout & Package
Package: 8-lead TSOT-23 (TS8), 3mm × 1.75mm footprint, lead-free (PBF), RoHS-compliant, thermal resistance θJA = 195°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors external supply via resistive divider; asserts PFO low when voltage falls below 500mV (falling edge). |
| ADJ | Adjustable monitor input | Third comparator input with 0.5V threshold; used to supervise custom voltages (e.g., 12V via 24:1 divider). |
| TMR | Reset timeout/latch control | Connect to V1 for 200ms internal timeout; pull to GND to latch RST state for margin testing. |
| GND | Device ground reference | Common return for all analog and digital functions; exposed pad not present in TSOT-23 variant. |
| V2 | 5V supply monitor input | Dedicated 5V rail input for LTC2911-1 variant; threshold = 4.675V (–6.5%) with ±1.5% accuracy. |
| V1 | 3.3V supply monitor input & VCC source | Primary 3.3V rail monitor (3.086V threshold); supplies internal VCC when ≥ V2, and provides weak pull-up for RST/PFO. |
| PFO | Power-fail logic output | Open-drain output pulled low on PFI undervoltage; signals early warning (e.g., to MCU NMI) before system reset. |
| RST | Reset logic output | Open-drain reset output asserted low if any monitored supply (V1/V2/ADJ) falls below threshold for >200ms. |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent 3.3V, 5V, and adjustable inputs enable full-system rail supervision without external comparators or dividers. |
| ±1.5% threshold accuracy over temperature | Reduces required supply voltage margin by >1.5% vs. ±2.5% supervisors, improving system reliability at low VCC. |
| Configurable reset timeout | Internal 200ms option eliminates timing capacitor; external CTMR support allows 15ms–280ms range for design flexibility. |
| Power-fail comparator with hysteresis | 500mV/515mV thresholds provide noise-immune early warning of primary supply collapse before critical rail failure. |
| Reset latch mode | Pulling TMR to GND freezes RST state, enabling safe voltage margin testing without unintended system resets. |
Applications
| Desktop Computer Power Sequencing | Industrial PLC I/O Module Supervision |
|---|---|
Use Scenario: Coordinating startup of CPU core, memory, and peripheral rails in x86-based motherboards. IC Role / Device Role / Timing Role: Triple-supply monitor ensuring 3.3V, 5V, and auxiliary 12V rails stabilize before releasing processor reset. Use Value: Prevents boot failures caused by out-of-spec rail sequencing; ±1.5% accuracy avoids false resets during transient load steps. |
Use Scenario: Monitoring isolated 24V DC input, 5V logic, and 3.3V FPGA core supplies in programmable logic controllers. IC Role / Device Role / Timing Role: Simultaneous supervision of primary field power, internal regulation, and FPGA domain with latched margin test capability. Use Value: Enables field-service voltage stress testing without disrupting controller operation; PFO warns of 24V sag before brownout shutdown. |
| Automotive Infotainment Head Unit | Network Server Redundant PSU Monitoring |
Use Scenario: Validating battery-backed 12V, 5V USB, and 3.3V SoC rails in automotive infotainment systems operating from 9–16V battery. IC Role / Device Role / Timing Role: Monitors main 12V input (via ADJ divider), 5V USB rail, and 3.3V SoC supply; PFO triggers graceful shutdown on battery drop. Use Value: Guarantees safe state save before ignition-off; 0.5V VCC operation ensures RST remains valid during deep battery discharge. |
Use Scenario: Detecting failure of primary AC/DC PSU while secondary remains active in dual-PSU server chassis. IC Role / Device Role / Timing Role: Using PFI to monitor primary PSU output and ADJ to supervise secondary; RST held until failover completes. Use Value: Enables seamless switchover with no system reboot; ±1.5% thresholds prevent nuisance trips during PSU load-sharing transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6361KA29+T | Fixed 2.93V reset only; single-supply monitor with manual reset input; no PFI/PFO or adjustable input. | Lacks triple-monitoring, power-fail warning, and latch mode - suitable only for basic 3.3V-only systems. | Select only if design requires minimal feature set, lower cost, and no early-warning capability. |
| TPS3808G33DBVR | Single 3.3V supervisor; 200ms fixed timeout; no V2/ADJ/PFI inputs; supports watchdog but no power-fail comparator. | Cannot replace triple-monitoring function; requires additional ICs to supervise 5V and auxiliary rails. | Choose only for cost-sensitive 3.3V-only applications where PFI and ADJ functionality are unnecessary. |
Compared with MAX6361KA29+T and TPS3808G33DBVR, the LTC2911CTS8-1#TRMPBF uniquely integrates three independent voltage monitors, a dedicated power-fail comparator with hysteresis, and latch-mode reset control in a single TSOT-23-8 package - eliminating board area, component count, and timing coordination overhead in multi-rail systems.
Availability
LTC2911CTS8-1#TRMPBF is available at Aetrix Electronics and suitable for desktop computer power sequencing, industrial PLC I/O modules, and automotive infotainment head units requiring stable component supply, guaranteed long-term availability, and full traceability.
Supply support for LTC2911CTS8-1#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC2911 series belongs to Linear's precision supervisor IC family, engineered specifically for high-reliability, multi-rail electronic systems where accurate voltage monitoring, early power-fail detection, and margin-test-ready reset control are critical.
FAQ
What is the exact reset threshold voltage for V1 and V2 on the LTC2911CTS8-1#TRMPBF?
The LTC2911CTS8-1#TRMPBF has a V1 reset threshold of 3.086V (–6.5% of 3.3V) and a V2 threshold of 4.675V (–6.5% of 5V), both guaranteed within ±1.5% over –40°C to +85°C. These values are fixed for the -1 variant and documented in the Electrical Characteristics table under VRT33 and VRT50 parameters.
Does the LTC2911CTS8-1#TRMPBF require an external capacitor for reset timeout?
No - the LTC2911CTS8-1#TRMPBF supports an internal 200ms reset timeout when the TMR pin is tied to V1, eliminating the need for an external capacitor. An external capacitor (e.g., 2.2nF) is optional and used only when a different timeout (e.g., 20ms) is required per the tRST(EXT) specification.
Can the LTC2911CTS8-1#TRMPBF monitor a 12V supply?
Yes - the ADJ pin of the LTC2911CTS8-1#TRMPBF has a 0.5V nominal threshold and can monitor any voltage using a resistive divider. For a 12V supply, a 24:1 divider (e.g., 2.4MΩ/100kΩ) scales 12V to 0.5V at ADJ, enabling precise undervoltage detection at 11.3V (–6.5% trip point).
How does the PFI/PFO function work on the LTC2911CTS8-1#TRMPBF?
The PFI input of the LTC2911CTS8-1#TRMPBF compares an external voltage (scaled via resistor divider) to a 500mV falling-edge threshold. When PFI drops below 500mV, PFO pulls low to signal imminent power failure - providing early warning to a processor NMI or shutdown controller before RST asserts.
Is the LTC2911CTS8-1#TRMPBF pin-compatible with other LTC2911 variants?
No - the LTC2911CTS8-1#TRMPBF shares identical pinout and package (TSOT-23-8) with all LTC2911-x variants, but its V2 threshold is fixed at 5V. Substituting a -2 (2.5V) or -3 (1.8V) variant would cause incorrect 5V rail monitoring and must be avoided unless circuit redesign confirms compatibility.
LTC2911CTS8-1#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:
- 3.086V, 4.675V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2911CTS8-1#TRMPBF FAQ
1.How can I place an order for LTC2911CTS8-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CTS8-1#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 LTC2911CTS8-1#TRMPBF reliable?
The price and inventory of LTC2911CTS8-1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911CTS8-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911CTS8-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CTS8-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CTS8-1#TRMPBF?
LTC2911CTS8-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CTS8-1#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 LTC2911CTS8-1#TRMPBF?
For technical support, including LTC2911CTS8-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CTS8-1#TRMPBF requirements.
6.How does Aetrix verify that LTC2911CTS8-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911CTS8-1#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 LTC2911CTS8-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911CTS8-1#TRMPBF?
All LTC2911CTS8-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CTS8-1#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 LTC2911CTS8-1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911CTS8-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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