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Analog Devices Inc. LTC2935IDC-4
- Part No.:
- LTC2935IDC-4
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2935IDC-4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,659
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Product details
Overview
LTC2935IDC-4 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 systems requiring early low-voltage warning and reliable system initialization.
For engineers reviewing the LTC2935IDC-4 datasheet, LTC2935IDC-4 pinout, LTC2935IDC-4 application, or LTC2935IDC-4 equivalent, this page delivers verified specifications, package mapping to the 2mm × 2mm DFN, functional role in power sequencing and controlled shutdown, and validated alternative options for portable, security, and wireless equipment designs.
Technical Context
The LTC2935IDC-4 integrates dual comparators with precision internal attenuators and hysteresis control: one monitors VCC against a user-configured falling reset threshold (VRTF), while the second triggers PFO at a fixed offset above that threshold (ΔVPFT = 120mV). Its internal 200ms reset timeout timer activates only after VCC rises 5% above the selected reset threshold.
It uses three binary inputs (S2/S1/S0) to select among eight discrete reset thresholds and corresponding power-fail thresholds; MR provides manual reset with 200ms debounce delay; both RST and PFO feature active pull-up logic referenced to VCC - eliminating external pull-up resistors and enabling valid output states down to VCC = 0V when paired with a 100kΩ ground tie.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 500nA typical - enables multi-year operation on coin cells without measurable battery drain. |
| Reset Threshold Range | 1.60V to 2.40V (8 pin-selectable values) - matches common low-voltage rails (1.8V, 2.5V, 3.3V logic domains). |
| Power-Fail Offset | +120mV above selected reset threshold - provides deterministic early-warning margin before system reset. |
| Threshold Accuracy | ±1.5% max over –40°C to +85°C - ensures reliable trip points across industrial temperature range. |
| Reset Timeout | 200ms nominal - guarantees sufficient processor initialization time after supply stabilization. |
| Hysteresis | 5% of selected reset threshold - prevents output chatter during slow-rising or noisy supply transitions. |
| Operating Temp | –40°C to +85°C - qualified for industrial and extended-temperature embedded applications. |
Pinout & Package
Package: 8-Lead (2mm × 2mm) Plastic DFN (DC package), exposed pad (optional GND connection), RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply & monitored rail input | Monitored voltage source; powers internal circuitry; requires 0.1μF decoupling to GND. |
| MR | Manual reset input | Pull low to force RST low for 200ms; internally pulled up to VCC via 900kΩ resistor. |
| RST | Active-pull-up reset output | Drives high to VCC when active; pulls low when VCC falls below selected threshold; valid down to VCC = 0V with 100kΩ ground tie. |
| PFO | Active-pull-up power-fail output | Drives high to VCC when active; pulls low when VCC falls below VPFT; released when VCC rises 2.5% above VPFT. |
| S2, S1, S0 | Binary threshold selection inputs | Set to GND or VCC to configure one of eight reset/power-fail threshold pairs (e.g., S2=High, S1=Low, S0=High → 1.72V/1.84V). |
| GND | Ground reference | Primary return path; exposed pad may be connected to PCB GND for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 500nA typical - extends battery life in always-on monitoring applications without compromising supervision integrity. |
| Pin-selectable thresholds | Eight discrete reset/power-fail pairs - eliminates need for external resistor dividers or trimming components. |
| Active pull-up outputs | RST and PFO drive to VCC - removes external pull-up resistors, reduces BOM count, and supports zero-VCC output validity. |
| Early power-fail warning | Dedicated PFO with fixed +120mV offset - enables controlled shutdown, state save, or alert generation before reset occurs. |
| Industrial temperature grade | –40°C to +85°C operation - certified for use in security systems, point-of-sale terminals, and outdoor wireless nodes. |
Applications
| Portable Equipment | Battery-Powered Sensors |
|---|---|
Use Scenario: Alkaline or Li-ion powered handheld meters with real-time display and data logging. IC Role / Device Role / Timing Role: Voltage supervisor providing system reset and early low-battery warning via PFO interrupt to microcontroller. Use Value: Enables graceful shutdown and nonvolatile memory write before brownout, using only 500nA standby current. |
Use Scenario: Wireless environmental sensor node operating on CR2032 coin cell for multi-year deployment. IC Role / Device Role / Timing Role: Monitors 3.0V supply rail; asserts PFO at 2.85V to trigger BLE transmission of low-battery status before RST at 2.70V. Use Value: Delivers deterministic 150mV warning margin and 200ms reset hold time - critical for reliable RF packet transmission prior to power loss. |
| Security Systems | Point-of-Sale Terminals |
Use Scenario: Battery-backed access control panel with tamper detection and event logging. IC Role / Device Role / Timing Role: Supervises backup battery voltage; generates PFO signal to initiate secure log flush and encryption key erasure. Use Value: Ensures cryptographic state protection during power failure - meets UL 294 and EN 50131 requirements for secure shutdown. |
Use Scenario: EMV-compliant payment terminal with dual power sources (USB + coin cell backup). IC Role / Device Role / Timing Role: Detects USB dropout and switches supervision to coin cell; configures thresholds for 1.8V logic and 3.3V I/O rails. Use Value: Maintains continuous supervision across power source transitions with no external component changes or firmware reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2935ITS8-4#TRPBF | Identical electrical specs and functionality; TSOT-23-8 package instead of DFN-8. | Smaller footprint (2.9mm × 1.6mm vs 2mm × 2mm); higher θJA (195°C/W vs 102°C/W); same pinout but different land pattern. | Select for space-constrained layouts where thermal load is low and board area is premium. |
| LTC2934IDC-4#TRPBF | Same DFN-8 package and -4 variant (active pull-up), but uses external resistor divider for threshold setting (not pin-selectable). | Requires two external resistors per monitored rail; supports arbitrary thresholds (e.g., 2.17V), not limited to eight fixed values. | Select when custom threshold values outside the LTC2935's 1.60V–2.40V range are required. |
Compared with LTC2935ITS8-4#TRPBF, the LTC2935IDC-4 offers lower thermal resistance and better power dissipation in compact PCBs; compared with LTC2934IDC-4#TRPBF, it eliminates external resistors and simplifies layout - at the cost of fixed threshold granularity.
Availability
LTC2935IDC-4 is available at Aetrix Electronics and suitable for portable equipment, battery-powered sensors, and security systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for LTC2935IDC-4 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 full product continuity, technical documentation, and manufacturing for all Linear-supervised ICs including the LTC2935 family.
The LTC2935 product line was designed specifically for ultra-low-power battery supervision in portable, medical, and industrial edge devices - emphasizing sub-1μA quiescent current, pin-configurable thresholds, and robust noise immunity.
FAQ
What is the exact reset threshold range supported by the LTC2935IDC-4?
The LTC2935IDC-4 supports eight discrete falling reset thresholds ranging from 1.60V to 2.40V in 120mV increments (e.g., 1.60V, 1.72V, 1.84V…2.40V), selected via S2/S1/S0 logic levels. Each threshold has a corresponding power-fail threshold 120mV higher. These values are production-tested and specified over –40°C to +85°C.
Does the LTC2935IDC-4 require external pull-up resistors on RST and PFO?
No - the LTC2935IDC-4 features active pull-up outputs that drive RST and PFO to VCC internally. External pull-ups are unnecessary. For operation with VCC = 0V, a 100kΩ resistor from RST or PFO to GND prevents floating states while maintaining low leakage.
How does the manual reset (MR) function behave on the LTC2935IDC-4?
When MR is pulled low (e.g., via pushbutton), RST immediately goes low. After MR returns high, RST remains low for a guaranteed 200ms timeout - identical to the power-on reset timing. The MR input has an internal 900kΩ pull-up to VCC and accepts logic-low signals down to 0.4V.
What is the power-fail threshold offset relative to the selected reset threshold in the LTC2935IDC-4?
The LTC2935IDC-4 provides a fixed +120mV offset between its power-fail threshold (VPFT) and the selected reset threshold (VRTF). For example, if S2/S1/S0 configure VRTF = 2.20V, then VPFT = 2.32V. This offset is production-guaranteed and applies across the full temperature range.
Can the LTC2935IDC-4 monitor voltages above 5.5V?
No - the absolute maximum rating for VCC is 6V, and the recommended operating range is up to 5.5V. Exceeding 5.5V risks damage or parametric shift. For higher-voltage rails, external resistor dividers must be used upstream of VCC, but the LTC2935IDC-4 itself only monitors the divided-down voltage applied to its VCC pin.
LTC2935IDC-4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 8-DFN (2x2)
LTC2935IDC-4 FAQ
1.How can I place an order for LTC2935IDC-4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2935IDC-4 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 LTC2935IDC-4 reliable?
The price and inventory of LTC2935IDC-4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2935IDC-4 is usually 5 days.
3.What payment methods are accepted for LTC2935IDC-4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2935IDC-4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2935IDC-4?
LTC2935IDC-4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2935IDC-4 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 LTC2935IDC-4?
For technical support, including LTC2935IDC-4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2935IDC-4 requirements.
6.How does Aetrix verify that LTC2935IDC-4 is sourced from the original manufacturer or authorized distributors?
All LTC2935IDC-4 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 LTC2935IDC-4 meets industry standards.
7.What is the process for return or replacement of LTC2935IDC-4?
All LTC2935IDC-4 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2935IDC-4, 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 LTC2935IDC-4 part is unused and in its original packaging.
Return procedure for LTC2935IDC-4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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