My Inquiry
My Account
Analog Devices Inc. LTC2911HTS8-1
- Part No.:
- LTC2911HTS8-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911HTS8-1.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,127
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2911HTS8-1 from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control, designed for automotive-grade systems. It monitors 3.3V (V1), 5V (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. It is used in engine control units, ADAS domain controllers, and automotive infotainment power sequencing.
For engineers reviewing the LTC2911HTS8-1 datasheet, LTC2911HTS8-1 pinout, LTC2911HTS8-1 application, or LTC2911HTS8-1 equivalent, key selection criteria include its automotive temperature grade (–40°C to +125°C), guaranteed ultralow-voltage operation at VCC = 0.5V, ±1.5% threshold accuracy across temperature, and configurable PFI-based early power-fail warning with 500mV falling-edge threshold.
Technical Context
The LTC2911HTS8-1 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 over full automotive temperature range. Its internal VCC is derived from the higher of V1 or V2, enabling robust operation during asymmetric supply ramp-up.
A dedicated power-fail comparator (PFI/PFO) provides early warning with 500mV falling threshold and 15mV hysteresis, while the TMR pin enables latch mode for margin testing or internal 200ms timeout selection. RST and PFO outputs feature weak pull-ups to V1 and support external pull-up for higher VOH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V nominal (3.3V – 6.5%), guaranteed 3.036V–3.135V over –40°C to +125°C - ensures reliable reset before 3.3V rail collapse |
| V2 Threshold | 4.675V nominal (5V – 6.5%), guaranteed 4.600V–4.750V over temperature - matches standard 5V supply tolerance band |
| ADJ Threshold | 500mV ±7.5mV (±1.5%) - enables precise resistive-divider configuration for custom supply monitoring |
| PFI Threshold | 500mV falling edge, 515mV rising edge (15mV hysteresis) - rejects noise while enabling accurate early power-fail detection |
| Reset Timeout | Internally fixed 200ms (TMR = V1) or externally programmable (9.4ms/nF) - eliminates need for external timing components in most automotive designs |
| Supply Current | 30µA typical at 25°C, ≤35µA over full temperature range - minimizes load on always-on battery rails |
| Min VCC | 0.5V guaranteed - ensures valid RST/PFO logic states during deep brown-out or cold-cranking conditions |
Pinout & Package
Package: 8-Lead Plastic TSOT-23 (TS8), 3mm × 1.75mm footprint, exposed pad optional, rated for TJMAX = 150°C, θJA = 195°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors system primary supply via resistive divider; asserts PFO low when voltage falls below 500mV |
| ADJ | Adjustable monitor input | 0.5V-threshold comparator for third supply; configured with external resistor 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 circuitry; exposed pad (if used) must be connected to GND |
| V2 | 5V supply monitor input | Fixed –6.5% undervoltage detector for 5V rail; also contributes to internal VCC generation |
| V1 | 3.3V supply monitor input | Fixed –6.5% undervoltage detector for 3.3V rail; primary source for RST/PFO pull-up current |
| PFO | Power-fail logic output | Open-drain output pulled low on PFI threshold breach; provides early warning interrupt signal |
| RST | Reset logic output | Open-drain reset signal asserted low if any monitored supply falls below threshold for timeout period |
Key Features
| Feature | Design Value |
|---|---|
| Automotive temperature grade | H-grade rating (–40°C to +125°C) with full parameter guarantee - qualified for under-hood and safety-critical ECUs |
| Triple simultaneous monitoring | Independent 3.3V, 5V, and adjustable thresholds enable single-chip supervision of multi-rail automotive power domains |
| Ultralow-voltage operation | Valid RST/PFO logic states down to VCC = 0.5V - prevents indeterminate reset behavior during cold-cranking or battery sag |
| Configurable power-fail warning | PFI input with 500mV/515mV thresholds and 15mV hysteresis allows precise early-warning setup for DC/DC inputs or battery stacks |
| Reset latch for margin testing | TMR pin latches RST state independently of input voltages - simplifies functional safety validation and voltage margining |
Applications
| Engine Control Unit (ECU) Power Supervision | ADAS Domain Controller Sequencing |
|---|---|
Use Scenario: Monitors 5V microcontroller core supply, 3.3V CAN transceiver rail, and 12V battery-derived ADJ input in diesel ECU. IC Role / Device Role / Timing Role: Triple-supply monitor with latched reset ensures deterministic boot after cold-cranking; PFO triggers NMI on battery voltage sag. Use Value: Prevents spurious resets during cranking (VBAT dip to 6V) and guarantees reset assertion before MCU logic fails at 2.97V. | Use Scenario: Supervises 3.3V SoC I/O, 5V camera sensor interface, and adjustable 1.8V vision processor rail in centralized ADAS controller. IC Role / Device Role / Timing Role: Simultaneous triple-rail monitoring with 200ms internal timeout ensures synchronized power-up of heterogeneous compute blocks. Use Value: Eliminates need for discrete supervisors per rail, reducing BOM count and PCB area by 67% vs. dual-LTC2903 solution. |
| Automotive Infotainment Head Unit | Electric Power Steering (EPS) Module |
Use Scenario: Monitors 3.3V audio codec, 5V display backlight driver, and ADJ-configured 12V DC/DC input in head unit mainboard. IC Role / Device Role / Timing Role: PFI monitors 12V input via divider; PFO asserts early warning before VCC collapse, enabling graceful UI shutdown. Use Value: Enables storage of user settings in EEPROM within 100ms of PFO assertion - meets ISO 16750-2 transient immunity requirements. | Use Scenario: Supervises 3.3V MCU, 5V motor driver gate drive, and ADJ-configured 24V battery rail in EPS control module. IC Role / Device Role / Timing Role: TMR latch mode enables functional safety margin testing at 2.8V without triggering system reset. Use Value: Supports ASIL-B diagnostic coverage by allowing controlled voltage stress testing without disrupting motor control loop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Single 3.3V monitor only; no V2/ADJ/PFI capability; 200ms fixed timeout; ±2.5% threshold accuracy | Cannot replace LTC2911HTS8-1 in triple-rail or power-fail warning roles; suitable only for basic 3.3V reset | Select only if design uses only one monitored rail and does not require automotive H-grade or PFI functionality |
| MAX6816EUT+T | Single-channel, 5V-only monitor; no adjustable input; no PFI; ±1.5% accuracy but only up to +85°C (I-grade) | Lacks V1/V2/ADJ triple monitoring and automotive temperature range; no power-fail warning capability | Consider only for non-automotive industrial 5V-only applications where extended temperature is not required |
Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2911HTS8-1 uniquely delivers triple-rail monitoring, automotive-grade temperature support, and integrated power-fail warning in a single TSOT-23 package - eliminating subsystem-level complexity and enabling ASIL-compliant diagnostics.
Availability
LTC2911HTS8-1 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS domain controllers, and electric power steering modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2911HTS8-1 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, with heritage from Linear Technology's precision power management portfolio.
The LTC2911 product line was designed specifically for high-reliability automotive and industrial power supervision, emphasizing ultralow-voltage operation, tight threshold accuracy, and integrated fault-detection features like power-fail warning and reset latching.
FAQ
What is the operating temperature range guaranteed for the LTC2911HTS8-1?
The LTC2911HTS8-1 is specified for –40°C to +125°C (H-grade) with full electrical performance guaranteed across this range, including ±1.5% threshold accuracy, 200ms timeout, and 0.5V minimum VCC operation. This makes it suitable for under-hood automotive applications where ambient temperatures exceed +105°C.
How does the LTC2911HTS8-1 generate its internal supply voltage (VCC)?
The LTC2911HTS8-1 generates its internal VCC from the higher of the V1 (3.3V) or V2 (5V) supply inputs. This dual-input architecture ensures continuous operation even if one rail collapses, and enables valid RST/PFO output states down to 0.5V VCC, critical for cold-cranking scenarios.
Can the LTC2911HTS8-1 monitor a 12V supply directly?
No - the LTC2911HTS8-1 inputs (V1, V2, ADJ, PFI) have absolute maximum ratings of 6.5V. To monitor a 12V supply, use a resistive divider to scale it to ≤6.5V at the ADJ or PFI pin. For example, a 2.4MΩ/100kΩ divider reduces 12V to 0.48V at ADJ, enabling precise 12V undervoltage detection at 11.5V trip point.
What is the function of the TMR pin in latch mode, and how is it used in functional safety testing?
Pulling the TMR pin to GND latches the current RST state, overriding normal reset behavior. In functional safety testing, this allows engineers to force RST low or high while varying supply voltages - verifying system response to marginal conditions without unintended resets, supporting ASIL-B diagnostic coverage requirements.
Does the LTC2911HTS8-1 require external pull-up resistors on RST and PFO?
The LTC2911HTS8-1 provides internal weak pull-ups to V1 (typically 29µA at 3.3V), sufficient for most microcontroller reset inputs. However, external pull-ups are recommended when VOH > V1 is needed (e.g., interfacing to 5V logic) or faster rise times are required - especially in noisy automotive environments where signal integrity is critical.
LTC2911HTS8-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LTC2911HTS8-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HTS8-1 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 reliable?
The price and inventory of LTC2911HTS8-1 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 is usually 5 days.
3.What payment methods are accepted for LTC2911HTS8-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HTS8-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HTS8-1?
LTC2911HTS8-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HTS8-1 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?
For technical support, including LTC2911HTS8-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HTS8-1 requirements.
6.How does Aetrix verify that LTC2911HTS8-1 is sourced from the original manufacturer or authorized distributors?
All LTC2911HTS8-1 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 meets industry standards.
7.What is the process for return or replacement of LTC2911HTS8-1?
All LTC2911HTS8-1 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HTS8-1, 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 part is unused and in its original packaging.
Return procedure for LTC2911HTS8-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2911HTS8-1 Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
