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Analog Devices Inc. LTC2935ITS8-4#TRMPBF
- Part No.:
- LTC2935ITS8-4#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2935ITS8-4#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2935ITS8-4#TRMPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with active-pull-up reset and power-fail outputs, eight pin-selectable reset thresholds (1.60V–2.40V), ±1.5% threshold accuracy over temperature, and 500nA typical quiescent current - designed for battery-powered security systems requiring reliable early-warning shutdown before brownout.
For engineers reviewing the LTC2935ITS8-4#TRMPBF datasheet, LTC2935ITS8-4#TRMPBF pinout, LTC2935ITS8-4#TRMPBF application, or LTC2935ITS8-4#TRMPBF equivalent, key selection criteria include its TSOT-23-8 package, –40°C to 85°C industrial temperature grade, active-pull-up RST/PFO outputs, 200ms reset timeout, and precise 120mV fixed power-fail margin above each selected reset threshold.
Technical Context
The LTC2935ITS8-4#TRMPBF integrates two precision comparators: one for reset generation at a user-configured falling VCC threshold (eight options via S2/S1/S0), and a second for early power-fail warning at a fixed offset (120mV) above that threshold. Its internal 5% hysteresis on reset release and 2.5% on PFO release prevents output chatter during supply transients.
It features active-pull-up outputs (LTC2935-4 variant), eliminating external pull-up resistors; a manual reset input (MR) with 200ms debounced release; and operates from 1V to 5.5V VCC while drawing only 500nA typical supply current - enabling multi-year operation on coin cells.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 500nA typical - enables >10-year battery life in CR2032-powered devices with 200μA average system load. |
| Reset Threshold Range | 1.60V to 2.40V (8 pin-selectable values) - matches common low-voltage logic rails (1.8V, 2.5V) and coin-cell discharge profiles. |
| Power-Fail Margin | +120mV above selected reset threshold - provides deterministic early warning window for controlled shutdown before reset assertion. |
| Reset Timeout | 200ms minimum after VCC exceeds threshold +5% hysteresis - ensures stable power rail settling before processor release. |
| Threshold Accuracy | ±1.5% max over –40°C to +85°C - guarantees reliable trip points across industrial temperature range without calibration. |
| Output Type | Active pull-up (LTC2935-4) - drives RST and PFO high to VCC without external resistors, simplifying BOM and layout. |
| Supply Voltage Range | 1V to 5.5V - supports operation down to near-dead battery voltage and compatibility with 3.3V/5V systems. |
Pinout & Package
Package: 8-Lead TSOT-23 (ThinSOT™), 2.9mm × 1.6mm footprint, exposed pad optional, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply and monitored voltage input | Primary power rail under supervision; requires 0.1μF decoupling to GND; powers internal circuitry and drives active-pull-up outputs. |
| MR | Manual reset input | Logic-low pulse ≥20μs forces RST low; internal 900kΩ pull-up to VCC; compatible with pushbutton-to-GND interface. |
| RST | Reset output | Active-pull-up output asserted low when VCC falls below selected threshold; released high after 200ms delay post-threshold +5% hysteresis. |
| PFO | Power-fail output | Active-pull-up output asserted low when VCC falls below reset threshold +120mV; released high after VCC rises above that threshold +2.5% hysteresis. |
| S2, S1, S0 | Threshold selection inputs | Binary-coded inputs (GND = Low, VCC = High) selecting one of eight reset/power-fail threshold pairs per table on datasheet page 1. |
| GND | Ground reference | System ground return for all internal comparators, timers, and output drivers; must be low-impedance connection. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 500nA typical enables multi-year operation on single coin cell without compromising supervision reliability. |
| Eight pin-selectable thresholds | Eliminates external resistor networks; supports direct matching to 1.8V, 2.5V, and alkaline/coin-cell discharge curves. |
| Fixed 120mV power-fail margin | Guarantees consistent early-warning timing independent of threshold selection - no recalibration needed. |
| Active-pull-up outputs | Removes need for external pull-up resistors on RST and PFO, reducing component count and PCB area in space-constrained designs. |
| 200ms reset timeout with hysteresis | Ensures clean, chatter-free reset release after power recovery, preventing premature processor wake-up during rail instability. |
Applications
| Portable Security Sensors | Battery-Powered Point-of-Sale Terminals |
|---|---|
Use Scenario: Wireless door/window sensors powered by CR2032 coin cell monitor battery voltage and trigger secure shutdown before communication failure. IC Role / Device Role / Timing Role: LTC2935ITS8-4#TRMPBF acts as primary voltage supervisor, asserting PFO to initiate NMI-driven firmware save and RST to hold MCU in reset until recharge or replacement. Use Value: 500nA quiescent current extends battery life beyond 5 years; 1.60V–2.40V thresholds align precisely with CR2032 discharge curve; active-pull-up outputs interface directly with 1.8V MCU I/O. |
Use Scenario: Handheld POS terminals using dual AA alkaline cells require graceful shutdown when voltage drops below 2.4V to preserve transaction integrity. IC Role / Device Role / Timing Role: LTC2935ITS8-4#TRMPBF monitors VCC, asserts PFO at 2.52V (2.40V + 120mV) to halt peripheral activity, then asserts RST at 2.40V to freeze CPU state. Use Value: ±1.5% threshold accuracy ensures consistent shutdown behavior across temperature; 200ms reset timeout prevents spurious resets during transient load dips. |
| Wireless IoT Edge Nodes | Industrial Battery Backup Modules |
Use Scenario: LoRaWAN sensor nodes powered by Li-MnO₂ primary cells must detect end-of-life voltage sag and transmit final telemetry before power loss. IC Role / Device Role / Timing Role: LTC2935ITS8-4#TRMPBF generates PFO interrupt at 2.70V (configurable via S2/S1/S0) to trigger immediate data upload, followed by RST assertion at 2.55V to disable RF subsystem. Use Value: Eight discrete thresholds allow precise alignment to cell chemistry; active-pull-up outputs drive 3.3V logic without level shifters; TSOT-23-8 package fits <3mm² board area. |
Use Scenario: Programmable logic controllers with supercapacitor backup use LTC2935ITS8-4#TRMPBF to monitor main 24V rail and initiate switchover before brownout. IC Role / Device Role / Timing Role: LTC2935ITS8-4#TRMPBF supervises scaled-down VCC (via resistor divider), asserts PFO to enable backup regulator, then asserts RST to halt FPGA configuration if main supply fails. Use Value: Integrated precision attenuators eliminate external scaling resistors; 1V minimum operating voltage allows supervision even during deep discharge; industrial temp grade ensures reliability in factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2935ITS8-2#TRMPBF | Same package, temp grade, and pinout; differs only in output type - open-drain instead of active-pull-up. | Requires external pull-up resistors on RST/PFO; supports mixed-voltage interfacing (e.g., 5V-tolerant PFO pulled to 3.3V). | Select LTC2935ITS8-2#TRMPBF only if interfacing with higher-voltage logic or needing level translation; otherwise LTC2935ITS8-4#TRMPBF reduces BOM count. |
| LTC2934ITS8-4#TRMPBF | Adjustable thresholds via external resistors (not pin-selectable); same 500nA IQ, TSOT-23-8, and –40°C to 85°C rating. | Offers continuous threshold tuning (1.2V–5.5V) but requires two precision resistors and occupies more layout area. | Choose LTC2934ITS8-4#TRMPBF only when exact non-standard thresholds are required; LTC2935ITS8-4#TRMPBF delivers faster design cycle with factory-trimmed accuracy. |
Compared with LTC2935ITS8-2#TRMPBF, the LTC2935ITS8-4#TRMPBF eliminates external pull-ups and simplifies layout; compared with LTC2934ITS8-4#TRMPBF, it trades resistor-based flexibility for guaranteed ±1.5% accuracy and zero external components - optimizing for production cost and test repeatability.
Availability
LTC2935ITS8-4#TRMPBF is available at Aetrix Electronics and suitable for portable security sensors, battery-powered point-of-sale terminals, and wireless IoT edge nodes requiring stable component supply with guaranteed long-term availability and full industrial temperature support.
Supply support for LTC2935ITS8-4#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 acquired Linear Technology in 2017 and maintains its high-reliability analog IC portfolio, emphasizing precision, low power, and robust performance in harsh environments.
The LTC2935 family was designed specifically for ultra-low-power battery supervision in space- and energy-constrained applications, delivering pin-selectable thresholds, early power-fail warning, and industrial-grade reliability in miniature packages.
FAQ
What is the operating temperature range for the LTC2935ITS8-4#TRMPBF?
The LTC2935ITS8-4#TRMPBF is rated for –40°C to +85°C ambient operation, meeting industrial temperature requirements. This range is confirmed in the Absolute Maximum Ratings table and applies to all electrical specifications unless otherwise noted. The device uses internal thermal compensation to maintain ±1.5% threshold accuracy across this full span, making it suitable for outdoor or factory-floor deployments where ambient conditions vary widely.
How does the power-fail threshold relate to the reset threshold in the LTC2935ITS8-4#TRMPBF?
In the LTC2935ITS8-4#TRMPBF (LTC2935-4 variant), the power-fail threshold is fixed at exactly 120mV above the selected reset threshold - for example, if S2/S1/S0 configure a 2.40V reset point, PFO asserts at 2.52V. This differential is guaranteed by design and does not vary with temperature or supply voltage, providing deterministic early-warning timing for controlled shutdown sequences without external calibration.
Can the LTC2935ITS8-4#TRMPBF operate from a 1.5V supply?
Yes, the LTC2935ITS8-4#TRMPBF functions with VCC as low as 1V, so it fully supports 1.5V operation. At 1.5V, its active-pull-up outputs drive RST and PFO to ~1.5V (VCC), and its 1.60V minimum reset threshold remains valid. This enables reliable supervision of single alkaline or NiMH cells, and the 500nA quiescent current ensures minimal loading - critical for maintaining usable runtime in low-voltage battery systems.
What is the reset timeout duration for the LTC2935ITS8-4#TRMPBF?
The LTC2935ITS8-4#TRMPBF incorporates a fixed 200ms reset timeout period after VCC rises above the selected reset threshold plus 5% hysteresis. This delay is implemented by an internal RC timer and is specified from 140ms (min) to 260ms (max) over temperature. It ensures the power rail has stabilized before releasing the microcontroller from reset - preventing erratic startup due to supply ripple or load-induced droop.
Does the LTC2935ITS8-4#TRMPBF require external components for basic operation?
No external components are required for core supervision functionality of the LTC2935ITS8-4#TRMPBF. Only a 0.1μF ceramic capacitor between VCC and GND is recommended for decoupling. Unlike open-drain variants, the LTC2935ITS8-4#TRMPBF's active-pull-up outputs eliminate external pull-up resistors. Threshold selection is handled entirely by tying S2/S1/S0 to VCC or GND - no resistors, dividers, or trimming needed.
LTC2935ITS8-4#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:
- 1
- Voltage - Threshold:
- 8 Selectable Threshold Combinations
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2935ITS8-4#TRMPBF FAQ
1.How can I place an order for LTC2935ITS8-4#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2935ITS8-4#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 LTC2935ITS8-4#TRMPBF reliable?
The price and inventory of LTC2935ITS8-4#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2935ITS8-4#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2935ITS8-4#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2935ITS8-4#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2935ITS8-4#TRMPBF?
LTC2935ITS8-4#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2935ITS8-4#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 LTC2935ITS8-4#TRMPBF?
For technical support, including LTC2935ITS8-4#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2935ITS8-4#TRMPBF requirements.
6.How does Aetrix verify that LTC2935ITS8-4#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2935ITS8-4#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 LTC2935ITS8-4#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2935ITS8-4#TRMPBF?
All LTC2935ITS8-4#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2935ITS8-4#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 LTC2935ITS8-4#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2935ITS8-4#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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