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Analog Devices Inc. LTC2935CTS8-3#TRPBF
- Part No.:
- LTC2935CTS8-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2935CTS8-3#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2935CTS8-3#TRPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with pin-selectable reset and power-fail thresholds, open-drain RST/PFO outputs, and 500nA quiescent current. It provides system initialization, early low-voltage warning, and reset generation for battery-powered systems monitoring VCC from 1.6V to 3.45V. Its 200ms reset timeout and ±1.5% threshold accuracy over temperature support reliable operation in portable equipment and security systems.
For engineers reviewing the LTC2935CTS8-3#TRPBF datasheet, LTC2935CTS8-3#TRPBF pinout, LTC2935CTS8-3#TRPBF application, or LTC2935CTS8-3#TRPBF equivalent, key selection criteria include its eight binary-configurable reset thresholds (e.g., 2.44V nominal), fixed 120mV power-fail margin above reset, TSOT-23-8 package, –40°C to 85°C industrial temperature range, and open-drain output compatibility with external pull-up voltages up to 5.5V.
Technical Context
The LTC2935CTS8-3#TRPBF implements dual independent comparators: one for reset (VRTF) and one for power-fail (VPFT), each with built-in hysteresis (5% for reset, 2.5% for PFO). Thresholds are selected via three logic inputs (S2/S1/S0), enabling eight discrete falling-reset thresholds ranging from 1.60V to 2.44V (LTC2935-3 variant), with corresponding PFO thresholds 120mV higher.
Its internal reset timer enforces a 200ms delay before RST returns high after VCC exceeds the reset threshold by 5%, ensuring stable power-up sequencing. The MR input supports manual reset with 20μs minimum pulse width and internal 900kΩ pull-up, while all control inputs exhibit ±10nA leakage and 0.3–0.7×VCC logic thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 500nA typical - enables multi-year battery life in coin-cell or alkaline-powered devices without compromising supervision accuracy. |
| Reset Threshold Accuracy | ±1.5% max over –40°C to 85°C - ensures deterministic reset behavior across industrial temperature extremes without calibration. |
| Reset Threshold Range | 1.60V to 2.44V (8 pin-selectable values) - matches common low-voltage rails including 1.8V, 2.5V, and 3.3V logic domains with appropriate attenuation. |
| Power-Fail Margin | +120mV above selected reset threshold - provides guaranteed early warning window before system reset, supporting controlled shutdown sequences. |
| Reset Timeout Period | 200ms nominal - holds RST low long enough to ensure microcontroller or FPGA completes full initialization after power stabilization. |
| Output Type | Open-drain RST and PFO - allows level-shifting via external pull-up to voltages up to 5.5V, independent of VCC, enabling mixed-supply interface design. |
| Supply Voltage Range | VCC = 1V to 5.5V - operates down to single-cell Li-ion or NiMH discharge endpoints while maintaining supervision integrity. |
Pinout & Package
Package: 8-Lead Plastic TSOT-23 (2.9mm × 1.6mm × 0.8mm), RoHS-compliant, lead-free finish. Exposed pad not present in TSOT-23 variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply and monitored voltage input | Primary rail under supervision; must be bypassed with ≥0.01μF capacitor to GND; powers internal circuitry and defines logic thresholds. |
| MR | Manual reset input | Pull low to force RST assertion; internally pulled up to VCC via 900kΩ; 20μs minimum pulse width required for reliable activation. |
| RST | Reset output | Open-drain active-low signal; sinks current when VCC falls below selected reset threshold or MR is asserted; requires external pull-up. |
| PFO | Power-fail output | Open-drain active-low early-warning signal; asserts when VCC drops below VPFT = VRTF + 120mV; released at VPFT + 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; <10nA leakage ensures stable logic states. |
| GND | Device ground reference | Return path for all internal circuits and comparator references; must be connected directly to system ground plane for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 500nA typical enables >10-year battery life in coin-cell applications monitoring 2.5V rails with 1.72V reset threshold. |
| Eight pin-selectable thresholds | Eliminates external resistor networks; S2/S1/S0 configuration supports precise matching to system VCC tolerances without trimming. |
| Dual independent comparators | Separate reset and power-fail comparators with dedicated hysteresis (5% and 2.5%) prevent false triggering during load transients. |
| Open-drain outputs with 5.5V tolerance | Allows RST/PFO to interface with higher-voltage logic (e.g., 5V MCU I/O) using external pull-ups, decoupling supervision from VCC domain. |
| 200ms reset timeout with hysteresis | Guarantees clean release after brownout recovery; 5% rising-edge hysteresis prevents oscillation near threshold during slow-rising supplies. |
Applications
| Portable Medical Sensors | Battery-Powered Security Alarms |
|---|---|
|
Use Scenario: Continuous monitoring of CR2032 coin cell voltage in wearable ECG sensors to trigger low-battery alerts before data loss. IC Role / Device Role / Timing Role: LTC2935CTS8-3#TRPBF acts as primary voltage supervisor, asserting PFO at 2.55V (S2=High, S1=Low, S0=Low) to initiate graceful shutdown and flash LED warning. Use Value: 500nA ICC extends sensor runtime beyond 3 years on a single coin cell while providing deterministic 2.40V reset threshold to prevent MCU lockup. |
Use Scenario: Supervision of alkaline battery stack (3×AA) in wireless door/window sensors deployed in unconditioned environments. IC Role / Device Role / Timing Role: LTC2935CTS8-3#TRPBF monitors VCC and generates early PFO warning at 2.70V, allowing transmission of "low battery" packet before RST asserts at 2.55V. Use Value: ±1.5% threshold accuracy over –40°C to 85°C ensures consistent low-battery detection across seasonal temperature swings without recalibration. |
| Point-of-Sale (POS) Handheld Terminals | Industrial IoT Edge Nodes |
|
Use Scenario: Power management during hot-swap battery replacement in handheld credit card readers to maintain secure session continuity. IC Role / Device Role / Timing Role: LTC2935CTS8-3#TRPBF uses MR input to force synchronized reset across processor, secure element, and display controller during battery insertion. Use Value: 200ms reset timeout ensures all subsystems complete initialization before application firmware resumes, preventing cryptographic state corruption. |
Use Scenario: Supervision of 1.8V LDO output powering LoRaWAN transceiver and ARM Cortex-M0+ in remote environmental monitors. IC Role / Device Role / Timing Role: LTC2935CTS8-3#TRPBF configures 1.72V reset threshold (S2=High, S1=High, S0=High) to match LDO dropout, asserting RST before transceiver fails. Use Value: Open-drain PFO output pulled to 3.3V enables direct connection to MCU NMI pin for immediate interrupt-driven shutdown, preserving sensor calibration data. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2935ITS8-3#TRPBF | Identical functionality and pinout, but rated for –40°C to 85°C industrial temperature range versus 0°C to 70°C for LTC2935CTS8-3#TRPBF. | Required for deployments in outdoor or automotive-adjacent environments where ambient temperatures exceed 70°C. | Select LTC2935ITS8-3#TRPBF when operating outside commercial temperature limits; otherwise LTC2935CTS8-3#TRPBF suffices for indoor consumer-grade devices. |
| LTC2934CTS8#TRPBF | Adjustable thresholds via external resistors (not pin-selectable); same 500nA ICC, open-drain outputs, and 200ms timeout; lacks PFO output. | Suitable only for basic reset-only applications; cannot provide early power-fail warning needed for controlled shutdown. | Choose LTC2935CTS8-3#TRPBF when dual-threshold supervision (reset + early warning) is mandatory; LTC2934CTS8#TRPBF is a cost-optimized alternative if PFO is unnecessary. |
Compared with LTC2935ITS8-3#TRPBF, the LTC2935CTS8-3#TRPBF offers identical electrical performance but reduced temperature coverage, making it suitable for cost-sensitive commercial applications. Versus LTC2934CTS8#TRPBF, it adds critical power-fail functionality and eliminates external resistor dependencies, simplifying BOM and layout while enabling robust low-power shutdown protocols.
Availability
LTC2935CTS8-3#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered security alarms, point-of-sale terminals, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term availability.
Supply support for LTC2935CTS8-3#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 acquired Linear Technology in 2017 and maintains its precision analog product lines. Linear Technology was renowned for high-performance power management and signal conditioning ICs with rigorous characterization and long-lifecycle support.
The LTC2935 series belongs to Linear's ultra-low-power supervisor family, designed specifically for energy-constrained applications where battery life, deterministic reset behavior, and minimal external components are critical-such as wearables, remote sensors, and portable instrumentation.
FAQ
What is the maximum supply voltage for LTC2935CTS8-3#TRPBF?
The absolute maximum VCC rating for LTC2935CTS8-3#TRPBF is 6V, but the recommended operating range is 1V to 5.5V. Exceeding 5.5V risks damage to internal ESD structures and may invalidate parametric guarantees. For 5V systems, operation at 5.5V is permissible only under transient conditions per Absolute Maximum Ratings.
How does the power-fail threshold relate to the reset threshold in LTC2935CTS8-3#TRPBF?
In LTC2935CTS8-3#TRPBF, the power-fail threshold (VPFT) is fixed at exactly 120mV above the selected reset threshold (VRTF), as confirmed in the Electrical Characteristics table and Applications Information section. This differential is inherent to the LTC2935-3 variant and does not vary with temperature or supply voltage.
Can LTC2935CTS8-3#TRPBF be used with a 1.8V supply rail?
Yes - LTC2935CTS8-3#TRPBF supports VCC down to 1V and offers a 1.72V reset threshold (S2=High, S1=High, S0=High) that aligns precisely with 1.8V system rails. Its ±1.5% accuracy ensures reliable reset assertion before 1.8V logic becomes unstable, and 500nA ICC minimizes loading on the regulated rail.
What is the function of the exposed pad in LTC2935CTS8-3#TRPBF?
LTC2935CTS8-3#TRPBF uses the TSOT-23-8 package, which has no exposed pad. Exposed pad information in the datasheet applies only to the DFN (DC) variant. The TSOT-23 package relies on standard lead-frame thermal conduction; no PCB thermal pad or solder connection is required or supported for this part number.
Does LTC2935CTS8-3#TRPBF require external pull-up resistors on RST and PFO?
Yes - LTC2935CTS8-3#TRPBF features open-drain RST and PFO outputs and requires external pull-up resistors. Recommended values range from 10kΩ to 470kΩ; 100kΩ is typical for balancing speed and power. Pull-up voltage may be up to 5.5V, independent of VCC, enabling interface with higher-voltage logic domains.
LTC2935CTS8-3#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:
- 1
- Voltage - Threshold:
- 8 Selectable Threshold Combinations
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2935CTS8-3#TRPBF FAQ
1.How can I place an order for LTC2935CTS8-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2935CTS8-3#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 LTC2935CTS8-3#TRPBF reliable?
The price and inventory of LTC2935CTS8-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2935CTS8-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2935CTS8-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2935CTS8-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2935CTS8-3#TRPBF?
LTC2935CTS8-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2935CTS8-3#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 LTC2935CTS8-3#TRPBF?
For technical support, including LTC2935CTS8-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2935CTS8-3#TRPBF requirements.
6.How does Aetrix verify that LTC2935CTS8-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2935CTS8-3#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 LTC2935CTS8-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2935CTS8-3#TRPBF?
All LTC2935CTS8-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2935CTS8-3#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 LTC2935CTS8-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC2935CTS8-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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