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Analog Devices Inc. LTC2911HTS8-4#TRMPBF
- Part No.:
- LTC2911HTS8-4#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911HTS8-4#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2911HTS8-4#TRMPBF from Analog Devices (formerly Linear Technology) is a high-accuracy triple supply monitor IC with integrated power-fail comparator and latched reset control, designed for automotive-grade systems requiring ±1.5% threshold accuracy over –40°C to +125°C. It monitors 3.3V (V1), 1.2V (V2), and an adjustable input (ADJ) with 0.5V nominal threshold, supports internal 200ms reset timeout, and delivers 30µA typical quiescent current - used in engine control units, ADAS domain controllers, and automotive infotainment power sequencing.
For engineers reviewing the LTC2911HTS8-4#TRMPBF datasheet, LTC2911HTS8-4#TRMPBF pinout, LTC2911HTS8-4#TRMPBF application, or LTC2911HTS8-4#TRMPBF equivalent, key selection criteria include its H-grade temperature range, TSOT-23-8 package, 1.2V V2 fixed threshold, PFI-based early-warning power-fail signaling, and TMR-latch capability for margin testing under low-voltage stress conditions.
Technical Context
The LTC2911HTS8-4#TRMPBF implements three independent voltage comparators: V1 (3.3V, –6.5% trip), V2 (1.2V, –6.5% trip), and ADJ (0.5V nominal threshold), all with ±1.5% accuracy across –40°C to +125°C. Its internal VCC is derived from the higher of V1 or V2, enabling operation down to 0.5V supply while maintaining valid RST/PFO outputs.
A dedicated PFI comparator with 500mV falling-edge threshold and 15mV hysteresis drives the PFO output for early power-fail warning; the TMR pin supports three modes - external capacitor timing, internal 200ms timeout (TMR = V1), or latch (TMR = GND) - with glitch-immune propagation delays under 80µs for all monitored inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% (–6.5% of 3.3V); guarantees reliable reset assertion before system logic fails at 3.3V rail |
| V2 Threshold | 1.122V ±1.5% (–6.5% of 1.2V); precisely monitors low-voltage rails like DDR termination or core logic supplies |
| ADJ Threshold | 500mV ±1.5%; enables configurable third-supply monitoring via resistive divider (e.g., 1.8V, 2.5V, or custom) |
| PFI Threshold | 500mV falling / 515mV rising with 15mV hysteresis; provides noise-immune early warning of primary supply collapse |
| Reset Timeout | 200ms internal (TMR = V1) or 15–27ms external (CTMR = 2.2nF); ensures sufficient hold time for processor initialization |
| Quiescent Current | 30µA typical at 25°C; minimizes parasitic drain on battery-backed or always-on automotive subsystems |
| Operating Temp | –40°C to +125°C (H-grade); qualified for under-hood and safety-critical automotive applications per AEC-Q100 |
Pinout & Package
Package: 8-lead TSOT-23 (TS8), 3mm × 1.75mm footprint, exposed pad optional, θJA = 195°C/W. RoHS-compliant, lead-free (PBF), 500-piece tape-and-reel (#TRMPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors primary supply via resistive divider; asserts PFO low at 500mV falling edge for early shutdown signaling |
| ADJ | Adjustable monitor input | 0.5V threshold comparator; configures third supply trip point (e.g., 1.8V with 3.6:1 divider) without external reference |
| TMR | Reset timeout/latch control | Configures timing mode: open = ~400µs, V1 = 200ms internal, GND = latch RST state for margin testing |
| GND | Device ground | Reference for all comparators and outputs; exposed pad (if used) must connect to PCB ground plane |
| V2 | 1.2V supply monitor | Fixed –6.5% threshold (1.122V); monitors low-voltage rails such as I/O buffers or memory termination supplies |
| V1 | 3.3V supply monitor & VCC source | Primary 3.3V rail monitor (3.086V trip); also powers internal circuitry when ≥ V2; requires 0.1µF bypass |
| PFO | Power-fail output | Open-drain output pulled up to V1; signals imminent failure before V1/V2/ADJ undervoltage events occur |
| RST | Reset output | Open-drain reset signal asserted low when any monitored supply falls below threshold; latched via TMR |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent 3.3V, 1.2V, and adjustable (0.5V) thresholds enable full-system power integrity verification in one IC |
| Automotive-grade temperature range | –40°C to +125°C operation (H-grade) meets AEC-Q100 requirements for engine bay and ADAS deployment |
| Power-fail early warning | PFI/PFO path provides sub-80µs response to primary supply droop, allowing >10ms headroom for controlled shutdown |
| Latch-enabled margin testing | TMR pin forces RST into static high/low state during voltage stress tests, eliminating false resets during validation |
| Low-voltage operation guarantee | RST and PFO remain functional down to VCC = 0.5V, preventing indeterminate states during brownout recovery |
Applications
| Engine Control Unit (ECU) Power Supervision | ADAS Domain Controller Sequencing |
|---|---|
Use Scenario: Monitors 3.3V microcontroller core, 1.2V CPU I/O, and 5V sensor interface rails in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Triple-supply monitor with PFI tied to main 12V battery input; triggers PFO before V1/V2 collapse to initiate flash-safe shutdown. Use Value: Prevents EEPROM corruption during ignition-off transients by delivering 200ms guaranteed reset hold and early PFO warning. |
Use Scenario: Validates power rails for radar SoC, camera ISP, and CAN-FD transceivers in centralized ADAS domain controllers. IC Role / Device Role / Timing Role: V1 monitors 3.3V domain controller logic, V2 tracks 1.2V SoC core, ADJ configures 1.8V camera interface; TMR latch enables voltage margining. Use Value: Enables production-level voltage tolerance testing without hardware rework, reducing validation cycle time by >30%. |
| Automotive Infotainment Head Unit | Telematics Control Unit (TCU) |
Use Scenario: Ensures clean boot of Android-based head unit with multi-rail DC/DC conversion (3.3V, 1.2V, 1.8V). IC Role / Device Role / Timing Role: V1 = 3.3V display interface, V2 = 1.2V application processor core, ADJ = 1.8V audio codec; PFI monitors 5V USB-C PD input. Use Value: Eliminates boot hangs caused by marginal 1.2V rail rise time by enforcing 200ms timeout before RST release. |
Use Scenario: Supervises LTE modem, GNSS receiver, and CAN gateway supplies in always-connected TCUs. IC Role / Device Role / Timing Role: V1 = 3.3V modem logic, V2 = 1.2V GNSS LDO output, ADJ = 2.8V cellular PA bias; PFI watches 12V vehicle bus. Use Value: Provides deterministic wake-up sequence after cold crank (6V start) by holding RST until all rails stabilize above thresholds. |
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/2.5V/1.25V thresholds; no PFI input; 160ms fixed timeout; ±2.5% accuracy over –40°C to +85°C | Lacks power-fail warning and automotive H-grade temp range; suitable only for non-safety-critical industrial use | Select only if PFI functionality and 125°C operation are unnecessary and cost is primary constraint |
| TPS3808G33DBVR | Single 3.3V monitor; no V2/ADJ/PFI; 200ms timeout; ±0.5% accuracy but only over 0°C to +70°C | Cannot replace triple-monitor function; requires two additional supervisors to match LTC2911HTS8-4#TRMPBF capability | Use only in space-constrained designs where only 3.3V supervision is needed and extended temperature is not required |
Compared with MAX6369AUT+T and TPS3808G33DBVR, the LTC2911HTS8-4#TRMPBF uniquely integrates automotive-grade triple monitoring, PFI-based early warning, and latch-enabled margin testing in a single TSOT-23 package - eliminating BOM count, layout area, and qualification effort for AEC-Q100 systems.
Availability
LTC2911HTS8-4#TRMPBF is available at Aetrix Electronics and suitable for automotive ECU power supervision, ADAS domain controller sequencing, and telematics control unit (TCU) applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2911HTS8-4#TRMPBF 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, serving automotive, industrial, communications, and healthcare markets.
The LTC2911 family was designed specifically for automotive and industrial power integrity assurance - delivering precision triple-supply monitoring, power-fail warning, and latch-controlled reset in compact packages qualified to extended temperature grades.
FAQ
What is the exact V2 threshold voltage for LTC2911HTS8-4#TRMPBF?
The LTC2911HTS8-4#TRMPBF has a fixed V2 threshold of 1.122V ±1.5% (–6.5% of 1.2V nominal), 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 denotes the 1.2V V2 option. The threshold remains stable across temperature due to on-chip trimming.
Does LTC2911HTS8-4#TRMPBF support internal reset timeout without external components?
Yes, LTC2911HTS8-4#TRMPBF supports internal 200ms reset timeout by tying the TMR pin to V1. This eliminates the need for an external timing capacitor and reduces bill-of-materials count. The internal timeout is factory-trimmed and maintains ±30% accuracy over temperature, as confirmed in the tRST(INT) specification (140ms to 280ms).
Can LTC2911HTS8-4#TRMPBF monitor a 5V supply on the V2 pin?
No, LTC2911HTS8-4#TRMPBF is the "-4" variant, configured exclusively for 1.2V on V2. To monitor 5V, the correct part is LTC2911HTS8-1#TRMPBF. The V2 threshold is hard-coded per variant: -1 = 5V, -2 = 2.5V, -3 = 1.8V, -4 = 1.2V, -5 = adjustable. Mixing variants invalidates threshold guarantees.
How does the PFI input function in LTC2911HTS8-4#TRMPBF?
The PFI input in LTC2911HTS8-4#TRMPBF compares an externally divided voltage against a 500mV falling-edge threshold (with 15mV hysteresis). When the divided voltage drops below 500mV, PFO pulls low - providing early warning of primary supply collapse before V1/V2/ADJ thresholds are violated. PFI is independent of the three monitored supplies and supports resistor-based threshold configuration.
Is LTC2911HTS8-4#TRMPBF qualified for automotive applications?
Yes, LTC2911HTS8-4#TRMPBF carries the "H" temperature grade (–40°C to +125°C) and is manufactured and tested to meet AEC-Q100 reliability standards for automotive use. Its datasheet specifies H-grade operating range, automotive-grade packaging (TSOT-23), and production flow aligned with automotive quality requirements - making it suitable for ECU, ADAS, and infotainment systems.
LTC2911HTS8-4#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC2911HTS8-4#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HTS8-4#TRMPBF 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#TRMPBF reliable?
The price and inventory of LTC2911HTS8-4#TRMPBF 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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911HTS8-4#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HTS8-4#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HTS8-4#TRMPBF?
LTC2911HTS8-4#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HTS8-4#TRMPBF 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#TRMPBF?
For technical support, including LTC2911HTS8-4#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HTS8-4#TRMPBF requirements.
6.How does Aetrix verify that LTC2911HTS8-4#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911HTS8-4#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911HTS8-4#TRMPBF?
All LTC2911HTS8-4#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HTS8-4#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911HTS8-4#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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