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Analog Devices Inc. LTC2911ITS8-1#TRPBF
- Part No.:
- LTC2911ITS8-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911ITS8-1#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2911ITS8-1#TRPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator, designed for reliable system reset and early warning in multi-rail power systems. It monitors 3.3V (V1), 5V (V2), and an adjustable input (ADJ) with ±1.5% threshold accuracy over –40°C to 85°C, 30µA typical quiescent current, and 200ms internal reset timeout - used in network servers and industrial control units requiring deterministic brownout response.
For engineers reviewing the LTC2911ITS8-1#TRPBF datasheet, LTC2911ITS8-1#TRPBF pinout, LTC2911ITS8-1#TRPBF application, or LTC2911ITS8-1#TRPBF equivalent, this page delivers verified functional identity, TSOT-23-8 package mapping, confirmed V1/V2/ADJ/PFI/PFO/TMR/GND/RST pin roles, exact reset threshold values (3.086V, 4.675V, 500mV), power-fail hysteresis (15mV), and two validated alternative parts for design continuity.
Technical Context
The LTC2911ITS8-1#TRPBF implements three independent voltage comparators - one fixed 3.3V monitor (V1), one fixed 5V monitor (V2), and one adjustable 0.5V-threshold input (ADJ) - all sharing ±1.5% accuracy across temperature. Its power-fail comparator (PFI→PFO) features 500mV falling / 515mV rising thresholds with 15mV hysteresis for noise immunity.
Reset assertion is latched via TMR pin grounding, enabling margin testing; timeout is selectable between internal 200ms mode (TMR = V1) or external capacitor (e.g., 2.2nF → 20ms). RST and PFO outputs are open-drain with weak internal pull-up to V1 (29µA typ), supporting 0.5V minimum VCC operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V (3.3V −6.5%), guaranteed 3.036V–3.135V over full temp range - sets precise 3.3V rail undervoltage trip point |
| V2 Threshold | 4.675V (5V −6.5%), guaranteed 4.600V–4.750V - defines 5V rail monitoring window for reliable reset initiation |
| ADJ/PFI Threshold | 500mV nominal, ±7.5mV tolerance - enables configurable trip points via resistive dividers on ADJ and PFI inputs |
| Reset Timeout | 200ms internal (TMR = V1); 15–27ms with 2.2nF external capacitor - ensures sufficient hold-off during power ramp-up |
| Quiescent Current | 30µA typical at 25°C - minimizes load on monitored supplies in battery-backed or low-power systems |
| Operating Temp | –40°C to +85°C (I-grade) - qualified for industrial environments without derating |
| Supply Range | V1/V2: –0.3V to 6.5V; PFI: –0.3V to 2V - supports wide-input monitoring including Li-ion stacks and DC/DC outputs |
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; asserts PFO low when voltage falls below 500mV (falling edge) |
| ADJ | Adjustable monitor input | 0.5V threshold comparator for third supply; configured with resistor divider to set custom trip voltage |
| TMR | Reset timeout/latch control | Ground = latch RST state; V1 = enable 200ms internal timeout; capacitor-to-GND = programmable timeout |
| GND | Device ground reference | Return path for all internal comparators and output drivers; must be low-impedance for accurate thresholding |
| V2 | 5V supply monitor input | Fixed 5V (−6.5%) undervoltage detector; draws ≤30µA bias current; bypass with ≥0.1µF capacitor |
| V1 | 3.3V supply monitor & power source | Fixed 3.3V (−6.5%) detector; powers internal circuitry; provides weak pull-up for RST/PFO outputs |
| PFO | Power-fail logic output | Open-drain output asserting low on PFI under-voltage; provides early warning before main reset triggers |
| RST | System reset logic output | Open-drain reset signal pulled low if V1, V2, or ADJ fall below thresholds for >timeout period |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent 3.3V, 5V, and adjustable inputs - eliminates need for multiple discrete supervisors in multi-rail systems |
| ±1.5% threshold accuracy | Guaranteed over –40°C to +85°C - reduces required voltage margin by ~1.5% vs. ±3% parts, improving system reliability |
| Configurable power-fail hysteresis | 15mV intrinsic (3% of 500mV); expandable with external resistors - prevents chatter near threshold during noisy transients |
| 0.5V minimum VCC operation | RST/PFO remain functional down to VCC = 0.5V - ensures clean reset assertion during deep brownout or battery depletion |
| Reset latch for margin testing | TMR pin grounding holds RST state indefinitely - enables stable system evaluation at marginal supply voltages |
Applications
| Network Server Power Sequencing | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Coordinating startup of CPU, memory, and peripheral rails in 1U rack-mounted servers with 3.3V, 5V, and auxiliary 12V supplies. IC Role / Device Role / Timing Role: LTC2911ITS8-1#TRPBF monitors V1 (3.3V), V2 (5V), and ADJ (via divider on 12V) to assert RST only after all rails stabilize for ≥200ms. Use Value: Prevents firmware execution on incomplete power-up; PFO warns of AC loss 100ms before V1/V2 collapse, enabling graceful shutdown to flash. |
Use Scenario: Ensuring deterministic reset behavior in DIN-rail mounted programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: LTC2911ITS8-1#TRPBF supervises 3.3V FPGA core, 5V I/O, and ADJ-monitored 24V field bus supply - all with ±1.5% trip consistency across –40°C to +85°C. Use Value: Eliminates false resets caused by thermal drift; latch mode allows field technicians to verify operation at reduced 3.1V V1 without triggering spurious RST. |
| Automotive Infotainment Head Unit | Medical Diagnostic Imaging Subsystem |
|
Use Scenario: Managing power integrity in automotive-grade infotainment systems with battery-backed 3.3V MCU, 5V display, and adjustable 1.8V sensor interface rails. IC Role / Device Role / Timing Role: LTC2911ITS8-1#TRPBF uses PFI to monitor 12V battery via divider, generating PFO warning at 10.8V; V1/V2/ADJ enforce rail sequencing before boot. Use Value: Enables safe save-to-EEPROM prior to ignition-off brownout; 30µA quiescent current minimizes parasitic drain during vehicle sleep mode. |
Use Scenario: Guaranteeing fail-safe reset in MRI subsystem controllers where 3.3V digital, 5V analog, and ADJ-configured 1.2V ADC supplies must meet strict IEC 60601-1 requirements. IC Role / Device Role / Timing Role: LTC2911ITS8-1#TRPBF provides redundant monitoring: RST ensures no processor operation until all rails exceed thresholds; PFO triggers emergency power-down if main 48V supply dips. Use Value: Meets Class BF isolation requirements via galvanically isolated PFO signaling; ±1.5% accuracy satisfies diagnostic calibration stability mandates. |
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/5V/3.3V monitoring; no adjustable ADJ input; 200ms fixed timeout only; ±2.5% threshold accuracy | Lacks configurability for third rail; suitable only where all three rails are standard voltages | Select when ADJ flexibility is unnecessary and cost sensitivity outweighs accuracy requirements |
| TPS3808G33DBVR | Single 3.3V monitor only; requires two additional ICs for full triple monitoring; 200ms/300ms/400ms timeout options; ±0.5% accuracy | Higher BOM count and board area; superior accuracy but no power-fail comparator or latch function | Choose only if ultra-high threshold precision is critical and PFI/PFO functionality is handled externally |
Compared with MAX6369KA+T and TPS3808G33DBVR, the LTC2911ITS8-1#TRPBF uniquely integrates triple monitoring, adjustable threshold capability, power-fail warning, and reset latching in a single TSOT-23-8 package - reducing component count, layout complexity, and qualification effort for industrial and automotive designs.
Availability
LTC2911ITS8-1#TRPBF is available at Aetrix Electronics and suitable for network servers, industrial PLCs, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC2911ITS8-1#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2911 family was designed specifically for precision power monitoring in space-constrained, thermally demanding applications - delivering ±1.5% threshold accuracy, ultralow quiescent current, and integrated power-fail warning without external components.
FAQ
What is the exact reset threshold voltage for the V1 pin on the LTC2911ITS8-1#TRPBF?
The V1 pin on the LTC2911ITS8-1#TRPBF has a nominal reset threshold of 3.086V (3.3V −6.5%), with a guaranteed range of 3.036V to 3.135V over the full –40°C to +85°C operating temperature range. This value is specified in the Electrical Characteristics table under VRT33 and applies exclusively to the LTC2911-1 variant, which the LTC2911ITS8-1#TRPBF implements.
Does the LTC2911ITS8-1#TRPBF support an adjustable reset timeout period?
Yes, the LTC2911ITS8-1#TRPBF supports both internal and external reset timeout configuration. Connecting the TMR pin to V1 enables a fixed 200ms timeout. For programmable timing, connect a capacitor from TMR to GND: CTMR = 2.2nF yields ~20ms, and the relationship is approximately 9.4ms/nF. Leaving TMR open results in ~400µs minimum timeout.
Can the LTC2911ITS8-1#TRPBF monitor a 1.2V supply directly?
No - the LTC2911ITS8-1#TRPBF is the -1 variant, configured for 3.3V (V1) and 5V (V2) monitoring. To monitor 1.2V, use the LTC2911-4 variant (e.g., LTC2911ITS8-4#TRPBF), which specifies a 1.122V V2 threshold. The ADJ pin can monitor 1.2V indirectly via a resistive divider, but V2 itself is fixed at 5V for the -1 version.
What is the purpose of the PFI and PFO pins on the LTC2911ITS8-1#TRPBF?
The PFI (Power-Fail Input) pin accepts a divided-down voltage from a primary supply (e.g., 12V battery or 48V rail), comparing it to a 500mV threshold. When PFI falls below this level, the PFO (Power-Fail Output) pin pulls low - providing an early warning signal before V1/V2/ADJ collapse. This enables controlled shutdown, data save, or fault logging in the LTC2911ITS8-1#TRPBF-based system.
Is the LTC2911ITS8-1#TRPBF RoHS-compliant and lead-free?
Yes, the "#TRPBF" suffix in LTC2911ITS8-1#TRPBF explicitly denotes lead-free (Pb-free) finish and tape-and-reel packaging per RoHS Directive 2011/65/EU. The device uses matte tin lead finish and complies with JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) for unlimited floor life at <30°C/85% RH.
LTC2911ITS8-1#TRPBF 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2911ITS8-1#TRPBF FAQ
1.How can I place an order for LTC2911ITS8-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911ITS8-1#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 LTC2911ITS8-1#TRPBF reliable?
The price and inventory of LTC2911ITS8-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911ITS8-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911ITS8-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911ITS8-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911ITS8-1#TRPBF?
LTC2911ITS8-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911ITS8-1#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 LTC2911ITS8-1#TRPBF?
For technical support, including LTC2911ITS8-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911ITS8-1#TRPBF requirements.
6.How does Aetrix verify that LTC2911ITS8-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911ITS8-1#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 LTC2911ITS8-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911ITS8-1#TRPBF?
All LTC2911ITS8-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911ITS8-1#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 LTC2911ITS8-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911ITS8-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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