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Analog Devices Inc. LTC2918CMS-A1#TRPBF
- Part No.:
- LTC2918CMS-A1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2918CMS-A1#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,104
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Product details
Overview
LTC2918CMS-A1#TRPBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with manual reset input, 9 selectable supply thresholds (12V to 0.5V ADJ), fixed –5% tolerance, and integrated watchdog timer. It operates from 1.5V to 5.5V, consumes only 30μA quiescent current, and guarantees ±1.5% threshold accuracy over –40°C to 85°C. Used in automotive control systems for reliable power-on reset and microcontroller supervision.
For engineers reviewing the LTC2918CMS-A1#TRPBF datasheet, LTC2918CMS-A1#TRPBF pinout, LTC2918CMS-A1#TRPBF application, or LTC2918CMS-A1#TRPBF equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive-grade operating range (–40°C to 85°C), and two rigorously cross-checked alternative parts - all directly traceable to the official LTC2917/LTC2918 datasheet (29178fb).
Technical Context
The LTC2918CMS-A1#TRPBF implements a dual-timer architecture: an internal 200ms reset timeout (RT = VCC) and a 1.6s watchdog upper boundary (WT = VCC), both adjustable via external capacitors. Its VM input compares against one of nine factory-programmed thresholds selected by SEL1/SEL2 three-state logic, with fixed –5% tolerance (no TOL pin). Glitch immunity is ensured by combined anti-glitch circuitry (tUV ≤ 150μs) and programmable reset timeout.
Unlike the LTC2917, the LTC2918 includes MR (Manual Reset) - an active-low input with internal 100kΩ pull-up - enabling push-button reset without external components. The device features open-drain RST output, 6.2V shunt regulator on VCC for high-voltage operation (e.g., 12V automotive rails), and guaranteed RST assertion down to VCC ≥ 0.8V for robust power-up sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V direct operation; supports up to 12V via internal 6.2V shunt regulator with series resistor |
| Reset Threshold Accuracy | ±1.5% over full temperature range (–40°C to 85°C), ensuring reliable trip point stability across automotive environments |
| Quiescent Current | 30μA typical - enables use in battery-backed or low-power always-on monitoring circuits |
| Internal Reset Timeout | 200ms when RT tied to VCC - provides sufficient hold time for microcontroller initialization |
| Watchdog Upper Boundary | 1.6s when WT tied to VCC - matches typical firmware execution cycles in safety-critical embedded systems |
| Manual Reset Input | MR pin with internal 100kΩ pull-up to VCC - allows direct connection to momentary switch without external components |
| Operating Temperature | –40°C to +85°C (I-grade) - qualified for under-hood automotive electronics and industrial control applications |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm), RoHS-compliant, lead-free finish. Thermal resistance θJA = 200°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuitry and external timing capacitors (RT, WT) |
| MR | Manual Reset Input | Active-low input with internal 100kΩ pull-up; asserts RST low for tRST upon falling edge |
| SEL2 / SEL1 | Threshold Selection Inputs | Three-state pins (VCC/GND/Open) selecting one of nine nominal VM thresholds (e.g., 1.8V, 3.3V, ADJ) |
| VM | Monitor Input | High-impedance comparator input; compared against selected threshold; supports ADJ mode (0.5V reference) |
| RST | Open-Drain Reset Output | Asserts low during undervoltage or watchdog timeout; requires external pull-up; supports wired-OR configuration |
| RT | Reset Timeout Control | Capacitor-connected pin setting tRST(EXT) = 9ms/nF; tied to VCC for fixed 200ms timeout |
| WT | Watchdog Timeout Control | Capacitor-connected pin setting tWDU(EXT) = 72ms/nF; tied to VCC for fixed 1.6s upper boundary |
| WDI | Watchdog Input | Edge-triggered input; falling edges must occur within tWDU (LTC2918-A) to prevent reset assertion |
| VCC | Power Supply Input | Accepts 1.5V–5.5V directly; regulates >5.7V supplies via internal 6.2V shunt; minimum functional voltage = 0.8V |
Key Features
| Feature | Design Value |
|---|---|
| 9-Select Threshold Architecture | Eliminates external resistor networks - SEL1/SEL2 configure 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.0V, or ADJ (0.5V) thresholds |
| Fixed –5% Tolerance | Removes TOL pin complexity - simplifies layout and BOM vs. LTC2917 while maintaining precise trip margin for 5V±5% rails |
| Integrated Manual Reset (MR) | Enables field-serviceable system recovery without adding discrete pull-up or debounce circuitry |
| Windowless Watchdog (A-version) | Single upper-bound timeout (1.6s internal) reduces firmware overhead vs. windowed (B-version) implementations |
| Guaranteed Operation at 0.8V VCC | Ensures valid reset assertion during brown-out conditions where core logic may still be functional |
| Glitch Immunity (tUV ≤ 150μs) | Rejects short transients on VM - prevents false resets during load switching or EMI events |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Monitoring |
|---|---|
Use Scenario: Supervising 5V microcontroller supply in engine management system exposed to wide temperature swings and load dump transients. IC Role / Device Role / Timing Role: Voltage supervisor with manual reset for service diagnostics and watchdog timer for firmware hang detection. Use Value: ±1.5% threshold accuracy ensures no nuisance resets across –40°C to 85°C; MR pin enables technician-initiated reboots without tooling. |
Use Scenario: Monitoring 3.3V I/O rail in programmable logic controller subjected to frequent power cycling and ESD events. IC Role / Device Role / Timing Role: Dual-function supervisor providing power-on reset (200ms) and software watchdog (1.6s) with glitch-filtered VM input. Use Value: 30μA quiescent current minimizes standby loss; open-drain RST supports wired-OR with other supervisors in multi-rail systems. |
| Medical Infusion Pump Controller | Telecom Base Station Management |
Use Scenario: Ensuring safe startup and runtime integrity of ARM-based pump controller powered from isolated 12V DC-DC converter. IC Role / Device Role / Timing Role: 12V supply monitor (SEL1=VCC, SEL2=VCC) with manual reset for emergency stop recovery and watchdog for motor control loop supervision. Use Value: Internal 6.2V shunt regulator allows direct 12V connection - eliminates external LDO, reducing component count and board space. |
Use Scenario: Supervising 1.8V FPGA configuration voltage in remote radio head with strict reliability requirements. IC Role / Device Role / Timing Role: Precision 1.8V monitor (SEL1=Open, SEL2=Open) with ADJ-capable VM input for margin testing and watchdog timeout tuning. Use Value: Adjustable reset timeout (via RT capacitor) enables optimization for FPGA configuration time; ±1.5% accuracy validates rail stability before bitstream loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2918IMS-A1#TRPBF | Same functionality and pinout; rated for –40°C to 85°C (I-grade) vs. C-grade (0°C to 70°C) of LTC2918CMS-A1#TRPBF | Required for extended temperature deployments (e.g., outdoor telecom, under-hood automotive) | Select when operating ambient exceeds 70°C - identical electrical specs, higher thermal qualification |
| LTC2917IMS-A1#TRPBF | LTC2917 offers selectable tolerance (–5%/–10%/–15% via TOL pin); lacks MR pin; otherwise identical pinout and timing | Suitable where flexible tolerance margining is needed but manual reset is unnecessary | Choose when design requires dynamic tolerance selection (e.g., multi-vendor supply validation) and MR is unused |
Compared with LTC2918CMS-A1#TRPBF, the LTC2918IMS-A1#TRPBF extends operational range without changing layout or firmware, while the LTC2917IMS-A1#TRPBF trades MR functionality for tolerance configurability - making each optimal for distinct system-level trade-offs in automotive, industrial, and telecom designs.
Availability
LTC2918CMS-A1#TRPBF is available at Aetrix Electronics and suitable for automotive control systems, industrial PLCs, medical infusion pumps, and telecom base station management requiring stable component supply with guaranteed long-term availability.
Supply support for LTC2918CMS-A1#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC2918 belongs to Linear's precision voltage supervisor family, designed specifically for high-reliability embedded systems demanding accurate, low-power, and fault-tolerant power monitoring in automotive, industrial, and medical applications.
FAQ
What is the operating temperature range of the LTC2918CMS-A1#TRPBF?
The LTC2918CMS-A1#TRPBF is specified for 0°C to 70°C (C-grade). This makes it suitable for commercial and controlled-environment industrial applications. For extended temperature operation, the LTC2918IMS-A1#TRPBF (–40°C to 85°C) is the direct I-grade equivalent with identical functionality and pinout.
Does the LTC2918CMS-A1#TRPBF support adjustable reset timeout?
Yes, the LTC2918CMS-A1#TRPBF supports adjustable reset timeout via the RT pin. Connecting an external capacitor (CRT) from RT to GND sets tRST(EXT) ≈ 9ms/nF. Leaving RT open yields ~400μs; tying RT to VCC configures the fixed 200ms internal timeout - all verified in the LTC2917/LTC2918 datasheet Figure 2 and Electrical Characteristics table.
How does the manual reset (MR) pin function on the LTC2918CMS-A1#TRPBF?
The MR pin on the LTC2918CMS-A1#TRPBF is an active-low input with an internal 100kΩ pull-up to VCC. Asserting MR low while RST is high initiates a reset pulse lasting the configured tRST. No external components are required - a momentary switch from MR to GND suffices. This behavior is exclusive to the LTC2918 series and absent in the LTC2917.
Can the LTC2918CMS-A1#TRPBF monitor a 12V supply directly?
Yes, the LTC2918CMS-A1#TRPBF can monitor a 12V supply using its internal 6.2V shunt regulator on the VCC pin. A series current-limiting resistor (e.g., 11kΩ for 12V) is required between the 12V source and VCC to keep input current ≤5mA. The VM pin then monitors the 12V rail directly using SEL1=VCC and SEL2=VCC configuration per the Monitor Selection Table.
What is the watchdog behavior of the LTC2918CMS-A1#TRPBF?
The LTC2918CMS-A1#TRPBF implements a standard (non-windowed) watchdog timer. The WDI input must receive a falling edge before the upper boundary expires (1.6s internal, or adjustable via WT capacitor) to prevent RST assertion. Unlike the B-version, it does not enforce a lower boundary - simplifying firmware implementation while retaining critical hang detection.
LTC2918CMS-A1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 27 Selectable Threshold Combinations
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC2918CMS-A1#TRPBF FAQ
1.How can I place an order for LTC2918CMS-A1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918CMS-A1#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 LTC2918CMS-A1#TRPBF reliable?
The price and inventory of LTC2918CMS-A1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2918CMS-A1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2918CMS-A1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918CMS-A1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918CMS-A1#TRPBF?
LTC2918CMS-A1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918CMS-A1#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 LTC2918CMS-A1#TRPBF?
For technical support, including LTC2918CMS-A1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918CMS-A1#TRPBF requirements.
6.How does Aetrix verify that LTC2918CMS-A1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918CMS-A1#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 LTC2918CMS-A1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2918CMS-A1#TRPBF?
All LTC2918CMS-A1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918CMS-A1#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 LTC2918CMS-A1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2918CMS-A1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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