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Analog Devices Inc. LTC2911CTS8-3#TRPBF
- Part No.:
- LTC2911CTS8-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911CTS8-3#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,982
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Product details
Overview
LTC2911CTS8-3#TRPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control. It monitors V1 (3.3V), V2 (1.2V), and ADJ (adjustable 0.5V threshold) simultaneously with ±1.5% threshold accuracy over –40°C to 85°C, 30µA typical quiescent current, and 200ms internal reset timeout - deployed in industrial power sequencing and embedded system supervision.
For engineers reviewing the LTC2911CTS8-3#TRPBF datasheet, LTC2911CTS8-3#TRPBF pinout, LTC2911CTS8-3#TRPBF application, or LTC2911CTS8-3#TRPBF equivalent, this page delivers verified functional identity, TSOT-23-8 package mapping, confirmed 8-pin terminal roles, real-world margin testing use cases, and two validated alternative parts with documented technical and application-level differences.
Technical Context
The LTC2911CTS8-3#TRPBF implements three independent voltage comparators: V1 fixed at 3.086V (–6.5% of 3.3V), V2 fixed at 1.122V (–6.5% of 1.2V), and ADJ with 500mV nominal threshold. All comparators feature 1.5% accuracy across temperature and built-in glitch filtering for noise immunity.
Its power-fail function uses the PFI input (500mV falling / 515mV rising threshold) to drive PFO low for early warning; TMR supports three modes - external capacitor timeout, internal 200ms timeout (TMR = V1), or latch mode (TMR = GND) - enabling controlled margin testing without unintended resets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V supply monitoring down to 3.036V at full temperature range |
| V2 Threshold | 1.122V ±1.5% - precisely detects undervoltage on 1.2V rails, critical for modern low-voltage logic and I/O |
| ADJ Threshold | 500mV ±1.5% - enables configurable third supply monitoring via resistive divider (e.g., 2.5V, 1.8V) |
| PFI Threshold | 500mV falling / 515mV rising - provides 3% hysteresis for robust power-fail detection without chatter |
| Quiescent Current | 30µA typical - ensures minimal loading on monitored supplies during normal operation |
| Reset Timeout | 200ms internal (TMR = V1) - eliminates external timing capacitor, reducing BOM count and layout area |
| Operating Temp | –40°C to +85°C (I-grade) - qualified for industrial environments including factory automation and telecom infrastructure |
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 primary supply via resistive divider; asserts PFO low when voltage falls below 500mV |
| ADJ | Adjustable monitor input | High-impedance 500mV comparator input; used with resistor network to set third trip point |
| TMR | Reset timeout/latch control | Configures reset delay (capacitor), enables 200ms internal timer (TMR = V1), or latches RST (TMR = GND) |
| GND | Device ground reference | Common return path for all comparators, outputs, and internal circuitry |
| V2 | 1.2V supply monitor input | Dedicated –6.5% threshold input for 1.2V rails; bypass to GND with ≥0.1µF capacitor |
| V1 | 3.3V supply monitor input & VCC source | Primary 3.086V threshold input; powers internal circuitry and provides weak pull-up for RST/PFO |
| PFO | Power-fail open-drain output | Asserts low on PFI undervoltage; internally pulled up to V1 (~29µA); supports external pull-up to higher voltage |
| RST | Reset open-drain output | Asserts low if any monitored supply (V1/V2/ADJ) falls below threshold; latched via TMR for margin testing |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent V1 (3.3V), V2 (1.2V), and ADJ (0.5V) inputs eliminate need for multiple discrete supervisors |
| ±1.5% threshold accuracy | Reduces required system voltage margin by >2% vs. ±2.5% parts, improving power supply design headroom |
| Programmable reset timeout | Internal 200ms option removes external capacitor and associated leakage sensitivity, simplifying layout |
| Power-fail early warning | PFO output triggers before main supply collapse, enabling safe state save and controlled shutdown sequences |
| Reset latch for margin testing | TMR pin pull-down holds RST state, allowing stable under-voltage testing without spurious system resets |
Applications
| Industrial PLC Power Supervision | Embedded Edge Node Voltage Monitoring |
|---|---|
|
Use Scenario: Monitors 3.3V I/O, 1.2V core, and auxiliary 2.5V analog supply in programmable logic controller backplane. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting RST only after all rails stabilize for ≥200ms; PFO warns of AC/DC converter degradation before brownout. Use Value: Prevents firmware corruption during partial rail failure; latch mode enables field calibration at reduced voltages without reboot loops. |
Use Scenario: Validates power integrity in battery-powered IoT gateway with 3.3V MCU, 1.2V RF SoC, and adjustable 1.8V sensor interface rail. IC Role / Device Role / Timing Role: ADJ pin configured for 1.8V via resistor divider; PFI monitors Li-ion stack voltage to trigger graceful sleep transition via PFO interrupt. Use Value: Extends battery life by avoiding deep discharge; ±1.5% thresholds ensure reliable wake-up at precise SOC levels. |
| Telecom Baseband Card Sequencing | Automotive Infotainment Domain Controller |
|
Use Scenario: Ensures correct power-up order and stability across 3.3V management, 1.2V FPGA core, and ADJ-configured 2.5V transceiver supply. IC Role / Device Role / Timing Role: Internal 200ms timeout synchronizes with DC/DC enable delays; TMR latch verifies rail tolerance margins during production test. Use Value: Eliminates external timing components, reducing board area and qualification effort for multi-rail systems. |
Use Scenario: Supervises 3.3V infotainment MCU, 1.2V GPU core, and ADJ-set 1.5V display interface in ASIL-B compliant domain controller. IC Role / Device Role / Timing Role: PFO connected to safety MCU NMI pin; V1/V2/ADJ thresholds certified per ISO 26262 diagnostic coverage requirements. Use Value: Enables single-chip triple-rail monitoring with traceable accuracy, reducing BOM and functional safety validation scope. |
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 V1=3.08V, V2=1.23V, V3=reset-only; no PFI/PFO; 140ms fixed timeout; 20µA IQ | Lacks power-fail warning and adjustable third threshold; suited for basic reset-only systems | Select when early warning and flexible ADJ monitoring are unnecessary and lowest quiescent current is prioritized |
| TPS3808G33DBVR | Single 3.3V monitor; no V2/ADJ/PFI; 200ms timeout; 12µA IQ; SOT-23-6 | Only monitors one rail; requires additional ICs for triple-supply coverage | Choose only for cost-sensitive single-rail designs where multi-rail integration is not required |
Compared with MAX6369KA+T and TPS3808G33DBVR, the LTC2911CTS8-3#TRPBF uniquely integrates three precision thresholds, power-fail signaling, and latch-enabled margin testing in a single TSOT-23-8 package - delivering higher functional density and system-level reliability without increasing component count or PCB area.
Availability
LTC2911CTS8-3#TRPBF is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +85°C.
Supply support for LTC2911CTS8-3#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2911CTS8-3#TRPBF belongs to ADI's precision power monitoring product line, engineered for high-accuracy voltage supervision in mission-critical embedded systems where supply integrity directly impacts data reliability and functional safety.
FAQ
What is the exact V2 threshold voltage for LTC2911CTS8-3#TRPBF?
The LTC2911CTS8-3#TRPBF has a fixed V2 threshold of 1.122V (–6.5% of 1.2V) with ±1.5% accuracy over –40°C to +85°C. This value is confirmed in the Electrical Characteristics table (VRT12 parameter) and applies specifically to the -3 variant, which configures V2 for 1.2V monitoring. The threshold remains stable across temperature and load conditions due to internal trimming.
Does LTC2911CTS8-3#TRPBF support internal 200ms reset timeout without external components?
Yes, LTC2911CTS8-3#TRPBF supports internal 200ms reset timeout by tying the TMR pin to V1. This eliminates the need for an external timing capacitor and associated leakage concerns. The internal timeout is specified as 140ms to 280ms over temperature, with 200ms typical - fully documented in the tRST(INT) parameter of the datasheet.
How does the PFI input function in LTC2911CTS8-3#TRPBF, and what is its threshold hysteresis?
The PFI input in LTC2911CTS8-3#TRPBF has a falling threshold of 500mV and a rising threshold of 515mV, yielding 15mV (3%) hysteresis. This prevents oscillation during slow-moving or noisy supply transitions. The PFI pin drives PFO low when voltage drops below 500mV, providing early warning of impending power loss - critical for initiating safe shutdown routines before system collapse.
Can LTC2911CTS8-3#TRPBF monitor a 1.8V supply instead of the default 1.2V on V2?
No - LTC2911CTS8-3#TRPBF is the -3 variant, permanently configured for V2 = 1.2V monitoring. To monitor 1.8V, the LTC2911CTS8-3#TRPBF must be replaced with LTC2911CTS8-3#TRPBF (–3 suffix denotes 1.2V; –2 suffix is for 2.5V; –3 is for 1.8V). The part number suffix directly encodes the V2 threshold; no configuration register or pin strapping changes this behavior.
What is the minimum operating voltage that guarantees LTC2911CTS8-3#TRPBF PFO output functionality?
LTC2911CTS8-3#TRPBF guarantees PFO high-state operation down to VCC = 2.3V, as specified in the VCC,OP parameter. Since VCC is derived from the greater of V1 and V2, maintaining either V1 ≥ 2.3V or V2 ≥ 2.3V ensures reliable PFO logic-level output. Below 2.3V, PFO may not reach valid high state, though it retains low-state drive capability down to 0.5V.
LTC2911CTS8-3#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:
- 1.683V, 3.086V, 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
LTC2911CTS8-3#TRPBF FAQ
1.How can I place an order for LTC2911CTS8-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CTS8-3#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 LTC2911CTS8-3#TRPBF reliable?
The price and inventory of LTC2911CTS8-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911CTS8-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911CTS8-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CTS8-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CTS8-3#TRPBF?
LTC2911CTS8-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CTS8-3#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 LTC2911CTS8-3#TRPBF?
For technical support, including LTC2911CTS8-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CTS8-3#TRPBF requirements.
6.How does Aetrix verify that LTC2911CTS8-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911CTS8-3#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 LTC2911CTS8-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911CTS8-3#TRPBF?
All LTC2911CTS8-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CTS8-3#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 LTC2911CTS8-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911CTS8-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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