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Analog Devices Inc. LTC2911HTS8-1#TRPBF
- Part No.:
- LTC2911HTS8-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911HTS8-1#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,797
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Product details
Overview
LTC2911HTS8-1#TRPBF from Analog Devices (formerly Linear Technology) is a high-accuracy triple supply monitor IC with integrated power-fail comparator and latched reset control. It monitors 3.3V (V1), 5V (V2), and an adjustable supply (ADJ) with ±1.5% threshold accuracy over –40°C to +125°C, supports internal 200ms reset timeout, and operates down to 0.5V VCC. Used in automotive engine control units for multi-rail voltage supervision during cold-crank conditions.
For engineers reviewing the LTC2911HTS8-1#TRPBF datasheet, LTC2911HTS8-1#TRPBF pinout, LTC2911HTS8-1#TRPBF application, or LTC2911HTS8-1#TRPBF equivalent, key selection criteria include its H-grade automotive temperature range (–40°C to +125°C), TSOT-23-8 package, 3.3V/5V/ADJ monitoring configuration, PFI-based early power-fail warning, and TMR-latch capability for margin testing.
Technical Context
The LTC2911HTS8-1#TRPBF implements three independent comparators: V1 fixed at 3.086V (–6.5% of 3.3V), V2 fixed at 4.675V (–6.5% of 5V), and ADJ with 500mV nominal threshold. All comparators feature 1.5% accuracy across full temperature range 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 before monitored supplies collapse; the TMR pin enables either external capacitor-set timeout (9.4 ms/nF), internal 200ms mode (TMR = V1), or latch mode (TMR = GND) to hold RST state during system margining.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V rail supervision even under worst-case temp/voltage drift |
| V2 Threshold | 4.675V ±1.5% - precisely tracks 5V supply at –6.5% dropout for clean reset assertion |
| ADJ Threshold | 500mV ±1.5% - enables configurable third rail monitoring via resistive divider |
| PFI Threshold | 500mV falling / 515mV rising - provides 3% hysteresis for robust early power-fail detection |
| Reset Timeout | 200ms internal or 15–27ms external (CTMR = 2.2nF) - ensures sufficient hold time after power stabilization |
| Supply Current | 30µA typical - enables always-on monitoring in low-power automotive subsystems |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 stress requirements |
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; triggers PFO low at 500mV falling edge for early warning |
| ADJ | Adjustable monitor input | 500mV threshold input for third rail; supports resistor-divider configuration of custom trip point |
| TMR | Timeout/latch control | Selects internal 200ms timeout (TMR = V1), external RC timeout (TMR to GND), or latches RST (TMR = GND) |
| GND | Device ground | Reference for all analog comparators and digital outputs; must be low-impedance connection |
| V2 | 5V supply monitor input | Fixed 4.675V undervoltage detector for 5V rail; powers internal circuitry when > V1 |
| V1 | 3.3V supply monitor input | Fixed 3.086V undervoltage detector for 3.3V rail; primary power source and pull-up reference for RST/PFO |
| PFO | Power-fail logic output | Open-drain output pulled up to V1; asserts low on PFI < 500mV to signal imminent supply collapse |
| RST | Reset logic output | Open-drain output pulled up to V1; asserts low if any monitored rail falls below threshold for > timeout |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent 3.3V, 5V, and adjustable rail supervision eliminates need for multiple discrete supervisors |
| ±1.5% threshold accuracy | Reduces required system voltage margin by ≥1.5% vs. ±2.5% parts, improving design headroom for tight-tolerance rails |
| Configurable reset timeout | Internal 200ms mode saves external capacitor; external RC option allows precise timing tuning (9.4 ms/nF) |
| Power-fail early warning | PFI/PFO path provides 10–100µs propagation delay to warn MCU before critical rails collapse |
| Reset latch for margin testing | TMR pin forces RST into static state-enables stable operation while probing marginal supply voltages |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Supervises 3.3V microcontroller core, 5V CAN transceiver, and 12V battery-sensed rail (via ADJ divider) during cold-crank (<6V battery). IC Role / Device Role / Timing Role: Triple comparator asserts RST only after all rails stabilize for 200ms; PFO warns MCU 5–10ms before 5V rail collapses. Use Value: Prevents spurious resets during cranking transients and enables graceful shutdown before brownout. | Use Scenario: Monitors isolated 3.3V logic, 24V field power, and 5V analog sensor supply in modular I/O chassis. IC Role / Device Role / Timing Role: V1/V2/ADJ detect undervoltage on each domain; PFO signals programmable logic controller (PLC) to disable outputs before fault propagation. Use Value: Eliminates need for three separate supervisors, reducing BOM count and PCB area by >40%. |
| Network Server Power Sequencing | Medical Infusion Pump Controller |
Use Scenario: Validates 3.3V FPGA config, 5V PCIe slot, and 1.8V memory rail prior to boot sequence initiation. IC Role / Device Role / Timing Role: RST remains low until all three rails exceed thresholds for full 200ms timeout; TMR latch holds reset during firmware update voltage stress tests. Use Value: Ensures deterministic power-up order and prevents partial initialization due to rail sequencing errors. | Use Scenario: Supervises 3.3V MCU, 5V motor driver, and battery-pack voltage (via ADJ) in safety-critical drug delivery system. IC Role / Device Role / Timing Role: PFI monitors main Li-ion stack; PFO triggers immediate pump stop and EEPROM save when pack drops below 3.2V. Use Value: Meets IEC 62304 Class C software safety requirements via hardware-level fail-safe signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369AUT+T | Fixed 3.0V/5.0V/adjustable thresholds; ±2.0% accuracy; no PFI/PFO; 140ms timeout only | Lacks dedicated power-fail warning path; lower accuracy increases system voltage margin requirement | Choose only if PFO functionality is unnecessary and cost sensitivity outweighs timing/accuracy needs |
| TPS3808G33DBVR | Single 3.3V monitor; no V2/ADJ inputs; no PFI; 200ms timeout; ±0.5% accuracy | Requires two additional ICs to match triple-monitor + PFI functionality; higher total BOM cost and board space | Select only for simple 3.3V-only systems where multi-rail supervision is handled externally |
Compared with MAX6369AUT+T and TPS3808G33DBVR, the LTC2911HTS8-1#TRPBF uniquely integrates triple-rail monitoring, ±1.5% accuracy, and dedicated PFI/PFO early-warning capability in a single TSOT-23-8 package-reducing component count, layout complexity, and validation effort for automotive and industrial multi-supply systems.
Availability
LTC2911HTS8-1#TRPBF is available at Aetrix Electronics and suitable for automotive ECU designs, industrial PLC modules, and medical infusion pump controllers requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for LTC2911HTS8-1#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 acquired Linear Technology in 2017 and maintains full product support, qualification, and manufacturing continuity for the LTC portfolio.
The LTC2911 series was designed specifically for high-reliability multi-rail voltage supervision in automotive, industrial, and medical systems where precision, wide temperature operation, and early power-fail warning are mandatory.
FAQ
What is the operating temperature range of the LTC2911HTS8-1#TRPBF?
The LTC2911HTS8-1#TRPBF is rated for –40°C to +125°C operation, meeting automotive under-hood requirements. This H-grade specification is confirmed in the Absolute Maximum Ratings table and Product Selection Guide, and distinguishes it from C-grade (0°C to 70°C) and I-grade (–40°C to 85°C) variants of the same device family.
How does the LTC2911HTS8-1#TRPBF differ from the LTC2911-1 variant?
The LTC2911HTS8-1#TRPBF is the H-grade (–40°C to +125°C), TSOT-23-8 packaged version of the LTC2911-1, which monitors 3.3V (V1), 5V (V2), and an adjustable rail (ADJ). The "H" suffix denotes automotive temperature qualification, "TS8" specifies the TSOT-23 package, and "#TRPBF" indicates lead-free, tape-and-reel packaging-making LTC2911HTS8-1#TRPBF the exact part number for high-temp automotive deployment.
Can the LTC2911HTS8-1#TRPBF monitor a 12V supply?
Yes-the LTC2911HTS8-1#TRPBF can monitor a 12V supply using the ADJ or PFI inputs with an external resistive divider. The ADJ pin has a 500mV threshold, so a 24:1 divider (e.g., 2.4MΩ + 100kΩ) sets a 12V trip point. The PFI input supports the same method for early power-fail warning, with 500mV/515mV thresholds and 3% hysteresis.
What is the purpose of the TMR pin on the LTC2911HTS8-1#TRPBF?
The TMR pin on the LTC2911HTS8-1#TRPBF controls reset behavior: tying it to V1 enables the internal 200ms timeout; connecting it to GND latches the RST output state (for margin testing); and connecting it to GND via a capacitor sets an external timeout (9.4 ms/nF). This single pin replaces discrete timing components and simplifies test-mode implementation without firmware changes.
Does the LTC2911HTS8-1#TRPBF require external pull-up resistors on RST and PFO?
The LTC2911HTS8-1#TRPBF provides weak internal pull-ups to V1 (typically 29µA at V1 = 3.3V), sufficient for most logic interfaces. However, external pull-ups are recommended when driving heavy capacitive loads (>50pF), interfacing to higher-voltage logic (e.g., 5V MCU), or requiring faster rise times-per Note 5 in the Electrical Characteristics section of the datasheet.
LTC2911HTS8-1#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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2911HTS8-1#TRPBF FAQ
1.How can I place an order for LTC2911HTS8-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HTS8-1#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 LTC2911HTS8-1#TRPBF reliable?
The price and inventory of LTC2911HTS8-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911HTS8-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911HTS8-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HTS8-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HTS8-1#TRPBF?
LTC2911HTS8-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HTS8-1#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 LTC2911HTS8-1#TRPBF?
For technical support, including LTC2911HTS8-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HTS8-1#TRPBF requirements.
6.How does Aetrix verify that LTC2911HTS8-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911HTS8-1#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 LTC2911HTS8-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911HTS8-1#TRPBF?
All LTC2911HTS8-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HTS8-1#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 LTC2911HTS8-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911HTS8-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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