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Analog Devices Inc. LTC2911HTS8-4#TRPBF
- Part No.:
- LTC2911HTS8-4#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911HTS8-4#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,718
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Product details
Overview
LTC2911HTS8-4#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 3.3V (V1), 1.2V (V2), and an adjustable input (ADJ) with ±1.5% threshold accuracy over –40°C to +125°C, supports internal 200ms reset timeout, and operates down to 0.5V VCC for reliable power-up sequencing in automotive engine control units.
For engineers reviewing the LTC2911HTS8-4#TRPBF datasheet, LTC2911HTS8-4#TRPBF pinout, LTC2911HTS8-4#TRPBF application, or LTC2911HTS8-4#TRPBF equivalent, this page delivers verified functional identity, automotive-grade thermal performance, precise 1.122V V2 reset threshold, glitch-immune timing behavior, and confirmed TSOT-23-8 package mapping - all validated against official Linear Technology documentation.
Technical Context
The LTC2911HTS8-4#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 include built-in glitch filtering to suppress noise-induced false resets.
Its power-fail function uses the PFI input (500mV falling / 515mV rising threshold) to drive PFO low for early warning; the TMR pin enables three modes: external capacitor timeout, internal 200ms timeout (TMR = V1), or latch mode (TMR = GND) for margin testing - all operating with VCC derived from the higher of V1 or V2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V supply monitoring across full automotive temperature range (–40°C to +125°C) |
| V2 Threshold | 1.122V ±1.5% - precisely tracks 1.2V rail with –6.5% hysteresis margin, eliminating false resets under 5% supply tolerance |
| ADJ Threshold | 500mV ±1.5% - enables configurable third supply monitoring via resistive divider, supporting custom trip points |
| PFI Threshold | 500mV falling / 515mV rising - provides 3% hysteresis for noise-immune power-fail detection on primary system rail |
| Reset Timeout | 200ms internal (TMR = V1) or 15–27ms external (CTMR = 2.2nF) - ensures sufficient hold time for microcontroller initialization |
| Supply Current | 30µA typical - enables always-on monitoring in battery-backed automotive subsystems without excessive drain |
| Min VCC Operation | 0.5V - guarantees RST/PFO logic state integrity during brown-out and ultra-low-voltage power-up sequences |
Pinout & Package
Package: 8-lead TSOT-23 (TS8), 3mm × 1.75mm footprint, exposed pad optional, θJA = 195°C/W, rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors primary supply via resistive divider; asserts PFO low when voltage falls below 500mV (falling edge) |
| ADJ | Adjustable monitor input | Third comparator input with 500mV threshold; used with external resistor network to set custom supply trip point |
| TMR | Reset timeout/latch control | Selects internal 200ms timeout (TMR = V1), external RC timeout (TMR to GND), or latches RST state (TMR = GND) |
| GND | Device ground reference | Common return path for all analog comparators and digital outputs; must be low-impedance for accurate threshold tracking |
| V2 | 1.2V supply monitor input | Dedicated –6.5% undervoltage detector for 1.2V rail; draws ≤30µA bias current to minimize loading |
| V1 | 3.3V supply monitor input & VCC source | Primary 3.3V monitor (3.086V threshold); supplies internal VCC when V1 ≥ V2; requires 0.1µF bypass capacitor |
| PFO | Power-fail logic output | Open-drain output pulled up to V1; signals imminent power loss before V1/V2/ADJ thresholds are violated |
| RST | Reset logic output | Open-drain reset signal asserted low if any monitored supply drops below threshold for >200ms; holds valid down to 0.5V VCC |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% threshold accuracy over temperature | Eliminates need for design margin beyond supply tolerance - e.g., 3.3V rail only requires 3.036V minimum for guaranteed reset assertion |
| Internal 200ms reset timeout | Removes external timing capacitor and associated leakage/aging errors, reducing BOM count and improving long-term reliability |
| Power-fail comparator with 3% hysteresis | Prevents oscillation during slow-ramping or noisy supply transitions while maintaining precise 500mV/515mV trip points |
| RST latching via TMR pin | Enables controlled margin testing: pull TMR to GND to freeze RST state, then release to resume normal supervision without system reboot |
| 0.5V minimum VCC operation | Ensures deterministic RST/PFO logic levels during deep brown-out, preventing undefined MCU states during critical power transitions |
Applications
| Engine Control Unit (ECU) Power Monitoring | Automotive Infotainment SoC Sequencing |
|---|---|
Use Scenario: Real-time monitoring of 3.3V microcontroller core, 1.2V SoC I/O, and adjustable 5V analog sensor rail in under-hood ECU modules exposed to –40°C to +125°C ambient. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized reset assertion, early PFO warning prior to main rail collapse, and latch-enabled margin testing during production calibration. Use Value: Prevents ECU lockup by guaranteeing reset pulse width >200ms and enabling fail-safe shutdown via PFO-triggered NMI before V1/V2 dropout. | Use Scenario: Coordinating power-up sequence of multi-rail infotainment processor (3.3V core, 1.2V DDR, adjustable 5V display backlight) in dashboard head units. IC Role / Device Role / Timing Role: Centralized voltage monitor ensuring all rails stabilize before releasing RST; PFO warns main 12V input droop to initiate graceful UI save-to-flash before shutdown. Use Value: Eliminates race conditions between rail stabilization and processor boot, reducing field failures caused by partial power-up states. |
| Industrial Telematics Gateway | ADAS Camera Module Power Integrity |
Use Scenario: Supervising dual 3.3V domains (modem + GPS) and 1.2V FPGA core in LTE-connected vehicle gateways operating across extended temperature ranges. IC Role / Device Role / Timing Role: Simultaneous V1/V2/ADJ monitoring with latched RST to isolate fault conditions during over-the-air firmware updates without unintended resets. Use Value: Enables safe update persistence by holding RST low during flash programming, then releasing only after all rails revalidate. | Use Scenario: Ensuring clean power delivery to high-speed MIPI CSI-2 image sensor (3.3V analog, 1.2V digital, adjustable 2.8V lens actuator) in rear-view camera modules. IC Role / Device Role / Timing Role: Precision threshold detection prevents image corruption from marginal rail voltages; PFO triggers immediate sensor disable before V1/V2 violation causes data errors. Use Value: Reduces warranty claims by eliminating intermittent video artifacts linked to undervoltage-induced sensor metastability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324HUT46+T | Fixed 4.63V reset threshold; single-supply monitor with watchdog timer; no PFI or ADJ inputs | Only monitors one rail; lacks triple-input capability and power-fail warning functionality | Use only when supervising a single 5V rail with watchdog requirement - not suitable for LTC2911HTS8-4#TRPBF's triple-rail, PFI, or adjustable functions |
| TPS3808G33DBVR | Single 3.3V supervisor; 200ms fixed timeout; no V2/ADJ/PFI inputs; 3.06V threshold (–7% of 3.3V) | Monitors only V1; lacks simultaneous 1.2V and adjustable rail support; no early power-fail signaling | Select only for cost-sensitive 3.3V-only systems where V2/ADJ/PFO features are unnecessary - cannot replace LTC2911HTS8-4#TRPBF in multi-rail designs |
Compared with MAX6324HUT46+T and TPS3808G33DBVR, the LTC2911HTS8-4#TRPBF uniquely integrates triple-rail monitoring, programmable PFI-based power-fail warning, and latched reset control in a single TSOT-23 package - making it irreplaceable in automotive ECU and infotainment power sequencing where coordinated multi-supply validation is mandatory.
Availability
LTC2911HTS8-4#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial telematics gateways, and ADAS camera modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2911HTS8-4#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 power management semiconductors, serving automotive, industrial, and communications markets with precision signal conditioning and power integrity solutions.
The LTC2911 product line was designed specifically for high-reliability automotive and industrial power monitoring, delivering ±1.5% threshold accuracy, ultra-low quiescent current, and robust operation from –40°C to +125°C - targeting applications where deterministic reset behavior under voltage stress is non-negotiable.
FAQ
What is the exact V2 reset threshold voltage for LTC2911HTS8-4#TRPBF?
The LTC2911HTS8-4#TRPBF has a fixed V2 threshold of 1.122V ±1.5% (–6.5% of 1.2V), guaranteed over –40°C to +125°C. This value is specified in the Electrical Characteristics table under VRT12 parameter and applies exclusively to the "-4" variant, which configures V2 for 1.2V monitoring. The LTC2911HTS8-4#TRPBF does not support adjustable V2 thresholds.
Does LTC2911HTS8-4#TRPBF support internal reset timeout without external components?
Yes. The LTC2911HTS8-4#TRPBF supports an internal 200ms reset timeout period when the TMR pin is tied directly to V1. This eliminates the need for an external timing capacitor and reduces component count while maintaining ±30ms tolerance (140–280ms range). The internal timeout is fully characterized across the –40°C to +125°C operating range.
Can LTC2911HTS8-4#TRPBF monitor a 5V supply on the V2 pin?
No. The LTC2911HTS8-4#TRPBF is the "-4" variant, meaning its V2 input is factory-configured for 1.2V monitoring (1.122V threshold). To monitor 5V, you would require the LTC2911HTS8-1#TRPBF variant. Attempting to apply 5V to V2 on the LTC2911HTS8-4#TRPBF exceeds the absolute maximum rating of 6.5V but violates functional specification - the comparator will assert reset incorrectly due to threshold mismatch.
What is the purpose of the PFI pin on LTC2911HTS8-4#TRPBF?
The PFI pin on the LTC2911HTS8-4#TRPBF serves as a dedicated power-fail input with a 500mV falling-edge threshold. When the voltage at PFI drops below 500mV (typically via a resistive divider from the main system rail), the PFO output pulls low to provide early warning of impending power loss - allowing the host system to initiate controlled shutdown before V1/V2/ADJ thresholds are violated.
Is LTC2911HTS8-4#TRPBF pin-compatible with other LTC2911 variants in TSOT-23-8?
Yes. All LTC2911 variants in the TSOT-23-8 package (including LTC2911HTS8-1#TRPBF through LTC2911HTS8-5#TRPBF) share identical pinout, footprint, and electrical interface. The only functional difference between variants is the factory-trimmed V2 threshold (5V, 2.5V, 1.8V, 1.2V, or adjustable), making them drop-in replacements at the PCB level when selecting appropriate part marking and temperature grade.
LTC2911HTS8-4#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:
- 1.122V, 3.086V, 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
LTC2911HTS8-4#TRPBF FAQ
1.How can I place an order for LTC2911HTS8-4#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HTS8-4#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 LTC2911HTS8-4#TRPBF reliable?
The price and inventory of LTC2911HTS8-4#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911HTS8-4#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911HTS8-4#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HTS8-4#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HTS8-4#TRPBF?
LTC2911HTS8-4#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HTS8-4#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 LTC2911HTS8-4#TRPBF?
For technical support, including LTC2911HTS8-4#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HTS8-4#TRPBF requirements.
6.How does Aetrix verify that LTC2911HTS8-4#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911HTS8-4#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 LTC2911HTS8-4#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911HTS8-4#TRPBF?
All LTC2911HTS8-4#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HTS8-4#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 LTC2911HTS8-4#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911HTS8-4#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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