My Inquiry
My Account
Analog Devices Inc. LTC2909CTS8-2.5#TRPBF
- Part No.:
- LTC2909CTS8-2.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2909CTS8-2.5#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,699
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2909CTS8-2.5#TRPBF from Analog Devices (acquired Linear Technology) is a precision dual adjustable-input undervoltage/overvoltage monitor with fixed 2.5V VCC UVLO, ±1.5% threshold accuracy, 50μA quiescent current, and open-drain RST output - used for reliable power-up/power-down sequencing in desktop computers, network servers, and automotive ECUs.
For engineers reviewing the LTC2909CTS8-2.5#TRPBF datasheet, LTC2909CTS8-2.5#TRPBF pinout, LTC2909CTS8-2.5#TRPBF application, or LTC2909CTS8-2.5#TRPBF equivalent, key selection criteria include input polarity configuration via SEL pin, internal 200ms reset timeout, buffered 1V reference for negative-supply offset, 0.5V nominal ADJ threshold, and guaranteed 0.5V operation down to VCC = 0.5V.
Technical Context
The LTC2909CTS8-2.5#TRPBF implements two independent 0.5V-threshold comparators with pin-selectable polarity (SEL = VCC/GND/OPEN), enabling simultaneous monitoring of positive UV/OV, negative UV/OV, or mixed-polarity supplies. Its third fixed UVLO channel monitors VCC at 2.213V (11.5% below 2.5V) with identical ±1.5% accuracy.
Reset assertion is synchronized across all inputs: RST remains low until VCC exceeds UVLO, both ADJ inputs are valid per configured polarity, and the selected timeout (internal 200ms, external capacitor, or disabled) completes. Glitch filtering on ADJ inputs rejects transients <500ns without hysteresis degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Threshold | 2.213V (nominal), ±1.5% over –40°C to 85°C - ensures accurate 2.5V system supply monitoring |
| ADJ Input Threshold | 0.500V ±0.0075V - enables precise trip-point setting for custom supply voltages via resistor dividers |
| Quiescent Current | 50μA typical - supports battery-backed or ultra-low-power monitoring applications |
| Reset Timeout Options | Internal 200ms, external capacitor (9ms/nF), or disabled (comparator mode) - eliminates need for external timing components |
| Buffered Reference | 1.000V ±15mV, ±1mA drive - provides stable offset for negative-supply monitoring circuits |
| Operating VCC Range | 0.5V to 6V - guarantees RST pull-down functionality even during brownout conditions |
| Input Polarity Control | Three-state SEL pin (VCC/OPEN/GND) - configures ADJ1/ADJ2 as +UV/–OV, +UV/+UV, or –UV/–OV without external logic |
Pinout & Package
Package: 8-lead TSOT-23 (3mm × 1.75mm), RoHS-compliant, lead-free (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ADJ1 (Pin 1) | Adjustable voltage input 1 | 0.5V threshold comparator input; polarity set by SEL - monitors positive or negative supplies |
| ADJ2 (Pin 2) | Adjustable voltage input 2 | 0.5V threshold comparator input; polarity set by SEL - enables dual-supply or window-monitoring configurations |
| REF (Pin 3) | Buffered 1V reference output | Stable offset source for negative-supply resistor dividers; drives up to 1mA load |
| GND (Pin 4) | Device ground reference | Common return path for all analog and digital circuitry; must be low-impedance |
| RST (Pin 5) | Open-drain inverted reset output | Asserts low on any fault condition; requires external pull-up; operates down to VCC = 0.5V |
| VCC (Pin 6) | Power supply input | Operates directly up to 6V; includes internal 6.5V shunt regulator for higher-voltage supplies |
| TMR (Pin 7) | Reset timeout control | Ground = 200ms internal timeout; VCC = comparator mode; capacitor to GND = programmable delay |
| SEL (Pin 8) | Input polarity select | Three-state logic (VCC/OPEN/GND) sets ADJ1/ADJ2 polarity combinations per Table 1 in datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Precision threshold accuracy | ±1.5% over full temperature range - eliminates need for calibration in production systems |
| Ultralow-voltage operation | Guaranteed RST assertion at VCC = 0.5V - ensures reliable reset during deep brownout |
| Glitch-immune comparator inputs | Integrated low-pass filtering rejects transients <500ns - prevents false resets from load noise |
| Configurable polarity per input | SEL pin selects three distinct ADJ1/ADJ2 polarity modes - supports mixed positive/negative supply monitoring |
| Space-constrained packaging | TSOT-23 footprint (3mm × 1.75mm) - fits high-density PCB layouts without sacrificing performance |
Applications
| Desktop Computer Core Voltage Monitoring | Automotive Engine Control Unit (ECU) Power Supervision |
|---|---|
Use Scenario: Monitoring 1.2V CPU core rail and 3.3V I/O rail during cold cranking where battery dips to 6V. IC Role / Device Role / Timing Role: Dual-input supervisor asserting RST until both rails stabilize above thresholds, using SEL = OPEN for positive polarity on both ADJ inputs. Use Value: Prevents ECU firmware execution under marginal supply conditions, leveraging 0.5V VCC operation and 200ms internal timeout. | Use Scenario: Detecting undervoltage on –12V sensor bias rail and overvoltage on 5V microcontroller supply in harsh automotive environments. IC Role / Device Role / Timing Role: Configured with SEL = GND to set ADJ1 for negative UV (–12V) and ADJ2 for positive OV (5V), using REF as offset reference. Use Value: Single IC replaces two discrete supervisors, reducing BOM count while maintaining ±1.5% trip accuracy across –40°C to 125°C. |
| Network Server 48V Intermediate Bus Monitoring | Notebook Computer Dual-Rail Sequencing |
Use Scenario: Supervising 48V intermediate bus and derived 12V rail in telecom equipment with strict fault-response requirements. IC Role / Device Role / Timing Role: ADJ1 monitors 48V via resistor divider (positive UV), ADJ2 monitors 12V (positive UV), TMR tied to GND for deterministic 200ms reset holdoff. Use Value: Eliminates external timing capacitors and reduces layout area versus discrete RC solutions, with guaranteed glitch rejection. | Use Scenario: Coordinating power-up of 1.8V SoC and 3.3V peripheral rail in space-constrained notebook designs. IC Role / Device Role / Timing Role: ADJ1 monitors 1.8V rail, ADJ2 monitors 3.3V rail, both configured positive polarity (SEL = VCC); RST released only after both rails exceed thresholds and timeout completes. Use Value: Ensures deterministic boot sequence without external logic, enabled by ultralow 50μA quiescent current and TSOT-23 package. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6816EUT+T | Single 2.5V UVLO channel only; no adjustable ADJ inputs or polarity selection | Suitable only for basic VCC supervision, not dual/mixed-supply monitoring | Select LTC2909CTS8-2.5#TRPBF when dual adjustable inputs or negative-rail support is required |
| TPS3808G125DBVR | Fixed 1.25V reset threshold; no buffered reference or polarity control; 1.8–6V VCC range | Designed for single-rail microprocessor reset, not multi-supply window or polarity-flexible monitoring | Choose LTC2909CTS8-2.5#TRPBF for applications needing 0.5V ADJ thresholds, REF output, or SEL-configurable polarity |
Compared with MAX6816EUT+T and TPS3808G125DBVR, the LTC2909CTS8-2.5#TRPBF uniquely supports dual independently configurable inputs, buffered 1V reference, and three-state polarity selection - making it the only option among the three for mixed positive/negative supply monitoring with ±1.5% accuracy.
Availability
LTC2909CTS8-2.5#TRPBF is available at Aetrix Electronics and suitable for desktop computer power sequencing, automotive ECU supervision, and network server intermediate bus monitoring requiring stable component supply and long-term industrial availability.
Supply support for LTC2909CTS8-2.5#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 LTC2909 product line delivers precision, low-power, multi-rail voltage supervision ICs designed specifically for mission-critical power integrity in computing, networking, and automotive electronics.
FAQ
What is the guaranteed minimum operating voltage for LTC2909CTS8-2.5#TRPBF?
The LTC2909CTS8-2.5#TRPBF guarantees functional RST output down to VCC = 0.5V, with VOL ≤ 0.15V at IRST = 2500μA. This enables reliable reset assertion during deep brownout conditions where other supervisors fail, and is validated across the full –40°C to 85°C temperature range per the datasheet's VCC(MIN) specification.
How does the SEL pin configure input polarity on LTC2909CTS8-2.5#TRPBF?
The SEL pin on LTC2909CTS8-2.5#TRPBF selects one of three polarity modes: SEL = VCC sets both ADJ1 and ADJ2 for positive polarity (UV detection), SEL = GND sets both for negative polarity (UV detection), and SEL = OPEN configures ADJ1 positive and ADJ2 negative. This mapping is defined in Table 1 of the datasheet and requires no external components.
Can LTC2909CTS8-2.5#TRPBF monitor a single supply for both undervoltage and overvoltage?
Yes - LTC2909CTS8-2.5#TRPBF can monitor one supply for UV/OV using three resistors: connect ADJ1 to a divider tap for UV detection and ADJ2 to another tap for OV detection, with SEL = VCC. Example configurations for ±5% tolerance on 5V or –5V supplies are provided in Figures 3 and 4 of the datasheet.
What is the function of the REF pin on LTC2909CTS8-2.5#TRPBF?
The REF pin on LTC2909CTS8-2.5#TRPBF provides a buffered 1.000V ±15mV reference output capable of sourcing/sinking ±1mA. It serves as a stable offset for resistor dividers monitoring negative supplies (e.g., connecting ADJ1 to a –12V rail via RN1/RN2 referenced to REF), eliminating need for external references.
Does LTC2909CTS8-2.5#TRPBF require an external capacitor on the TMR pin?
No - LTC2909CTS8-2.5#TRPBF supports three timeout modes: tying TMR to GND enables a factory-trimmed 200ms internal timeout (no capacitor needed), connecting TMR to VCC disables timeout for comparator-mode operation, and adding a capacitor to GND provides programmable delay (9ms/nF). External capacitor is optional, not mandatory.
LTC2909CTS8-2.5#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:
- 2.213V, Adj, Adj
- Output:
- Open Drain or Open Collector
- 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
LTC2909CTS8-2.5#TRPBF FAQ
1.How can I place an order for LTC2909CTS8-2.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2909CTS8-2.5#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 LTC2909CTS8-2.5#TRPBF reliable?
The price and inventory of LTC2909CTS8-2.5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2909CTS8-2.5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2909CTS8-2.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2909CTS8-2.5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2909CTS8-2.5#TRPBF?
LTC2909CTS8-2.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2909CTS8-2.5#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 LTC2909CTS8-2.5#TRPBF?
For technical support, including LTC2909CTS8-2.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2909CTS8-2.5#TRPBF requirements.
6.How does Aetrix verify that LTC2909CTS8-2.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2909CTS8-2.5#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 LTC2909CTS8-2.5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2909CTS8-2.5#TRPBF?
All LTC2909CTS8-2.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2909CTS8-2.5#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 LTC2909CTS8-2.5#TRPBF part is unused and in its original packaging.
Return procedure for LTC2909CTS8-2.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2909CTS8-2.5#TRPBF 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…
