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Analog Devices Inc. LTC2918HMS-B1#TRPBF
- Part No.:
- LTC2918HMS-B1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2918HMS-B1#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,495
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Product details
Overview
LTC2918HMS-B1#TRPBF from Analog Devices (formerly Linear Technology) is a high-temperature voltage supervisor IC with 9 selectable supply thresholds, fixed –5% tolerance, manual reset input, and windowed watchdog timer. It operates from 1.5V to 5.5V supply, consumes 30μA quiescent current, guarantees ±1.5% threshold accuracy over –40°C to 125°C, and supports automotive-grade reliability in 10-lead MSOP package.
For engineers reviewing the LTC2918HMS-B1#TRPBF datasheet, LTC2918HMS-B1#TRPBF pinout, LTC2918HMS-B1#TRPBF application, or LTC2918HMS-B1#TRPBF equivalent, this page delivers verified technical context, exact pin functions, real-world timing values (e.g., 200ms internal reset timeout, 1.6s internal watchdog upper boundary), and validated alternative options for industrial and automotive power monitoring designs.
Technical Context
The LTC2918HMS-B1#TRPBF implements a dual-stage supervision architecture: a precision comparator monitors VM against one of nine factory-programmed thresholds selected via SEL1/SEL2 three-state inputs, while a windowed watchdog logic block validates WDI falling-edge timing against both upper (tWDU = 1.6s) and lower (tWDL = 50ms) boundaries. Its RST output is open-drain with guaranteed low-level operation down to VCC = 0.8V.
It integrates an internal 6.2V shunt regulator on VCC for direct 12V operation (with external series resistor), features glitch immunity with 10μs–150μs detect-to-RST latency (tUV), and provides configurable timing via RT (reset timeout) and WT (watchdog timeout) pins - each supporting internal defaults or external capacitor adjustment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V - supports direct connection to common logic rails; shunt regulation enables 12V operation with series resistor. |
| Threshold Accuracy | ±1.5% over –40°C to 125°C - ensures reliable trip point across full automotive temperature range without calibration. |
| Reset Timeout (Internal) | 200ms (RT tied to VCC) - provides sufficient hold time for microcontroller initialization before release. |
| Watchdog Upper Boundary | 1.6s (WT tied to VCC) - sets maximum allowable software execution interval before system reset. |
| Watchdog Lower Boundary | 50ms (B1 version only) - prevents premature watchdog clearing due to noise or jitter; requires falling edge within window. |
| Quiescent Current | 30μA typical - enables long-term battery-backed or low-power embedded monitoring. |
| Manual Reset Input | MR pin with 100kΩ internal pull-up - allows direct push-button interface without external components. |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm), rated for –40°C to 125°C operation. Exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuitry and RST output sink current. |
| MR | Manual reset input | Active-low input with internal 100kΩ pull-up; asserts RST low for tRST when pulled below 0.2×VCC. |
| SEL2 | Threshold selection input | Three-state control (VCC/GND/open) selecting nominal voltage (e.g., 1.8V when both SEL1/SEL2 open). |
| SEL1 | Threshold selection input | Three-state control paired with SEL2 to define one of nine VM monitor thresholds per Table 1. |
| VM | Monitor input | High-impedance comparator input; compares against selected threshold; supports ADJ mode at 0.5V reference. |
| RST | Open-drain reset output | Asserts low during fault or reset timeout; requires external pull-up; sinks ≥2.5mA at 3.3V. |
| RT | Reset timeout control | Configures tRST: open = ~400μs, VCC = ~200ms, capacitor to GND = 9ms/nF scaling. |
| WT | Watchdog timeout control | Configures tWDU: open = ~3.2ms, VCC = ~1.6s, capacitor to GND = 72ms/nF scaling. |
| WDI | Watchdog input | Falling-edge-triggered input; must toggle within tWDL–tWDU window (50ms–1.6s) for B1 version. |
| VCC | Power supply input | Operates 1.5V–5.5V; includes 6.2V shunt regulator for >5.7V supplies; minimum functional voltage = 0.8V. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Enforces strict timing discipline: WDI falling edges must occur between 50ms and 1.6s intervals - prevents false clears from noise or stuck states. |
| Manual reset with integrated pull-up | Eliminates external resistor requirement; MR pin directly interfaces with momentary switch for field service or recovery. |
| Glitch-immune comparator | Rejects transients <10μs duration and <5% threshold magnitude - avoids spurious resets during load switching or EMI events. |
| Automotive temperature grade | Qualified for –40°C to 125°C ambient operation - meets AEC-Q100 stress test requirements for engine control and ADAS modules. |
| Adjustable threshold mode | VM pin accepts external resistive divider to set custom trip point (e.g., 9V @ –15%) with ±1.5% accuracy over temperature. |
Applications
| Engine Control Unit (ECU) Power Monitoring | ADAS Camera Module Supervision |
|---|---|
|
Use Scenario: Monitors 5V rail powering MCU and CAN transceiver in under-hood ECU exposed to thermal cycling and load dump transients. IC Role / Device Role / Timing Role: Voltage supervisor asserting RST during undervoltage or watchdog timeout; uses SEL1/SEL2 = VCC/Open for 5V threshold and WT = VCC for 1.6s watchdog window. Use Value: Prevents MCU lockup during cold cranking (VCC dip to 6V) and ensures firmware integrity via windowed watchdog - critical for ISO 26262 ASIL-B compliance. |
Use Scenario: Supervises 3.3V supply for image sensor and ISP in front-facing camera operating at 125°C junction temperature. IC Role / Device Role / Timing Role: Threshold monitor with 3.3V setting (SEL1 = VCC, SEL2 = GND); MR pin enables hardware reset after thermal shutdown recovery. Use Value: Guarantees ±1.5% trip accuracy at 125°C and 30μA quiescent current extends battery life during parking mode. |
| Industrial PLC I/O Module | Telecom Base Station Power Sequencing |
|
Use Scenario: Validates 2.5V FPGA core supply and 1.8V I/O supply in DIN-rail mounted controller subjected to wide ambient swings. IC Role / Device Role / Timing Role: Dual-supply monitoring using two LTC2918HMS-B1#TRPBF units; RT pin configured for 200ms reset hold to meet FPGA configuration timing. Use Value: Eliminates need for external timing capacitors and reduces BOM count versus discrete RC solutions. |
Use Scenario: Ensures clean startup of 12V backplane supply feeding multiple 3.3V/1.2V DC-DC converters in 5G radio unit. IC Role / Device Role / Timing Role: 12V supervisor (SEL1 = SEL2 = VCC) with ADJ mode used for precise 10.64V trip; shunt regulator enables direct 12V connection. Use Value: Internal 6.2V shunt eliminates external LDO or Zener, reducing footprint and improving efficiency in space-constrained RF modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369KA22+T | Fixed 2.2V threshold; no manual reset; non-windowed watchdog; 16-pin TQFN. | Lacks adjustable thresholds and MR pin - suitable only for single-rail systems with fixed trip point. | Select when cost sensitivity outweighs configurability needs and 2.2V monitoring suffices. |
| TPS3808G33DBVR | Fixed 3.3V threshold; no watchdog; 6-pin SOT-23; 1.6μA quiescent current. | No timing supervision - limited to basic power-on reset without firmware health checking. | Choose for ultra-low-power, single-threshold applications where watchdog functionality is unnecessary. |
Compared with MAX6369KA22+T and TPS3808G33DBVR, the LTC2918HMS-B1#TRPBF uniquely combines 9 programmable thresholds, manual reset, and windowed watchdog in a 10-lead MSOP - enabling robust, flexible supervision for multi-rail automotive and industrial systems without layout redesign.
Availability
LTC2918HMS-B1#TRPBF is available at Aetrix Electronics and suitable for automotive ECUs, ADAS camera modules, industrial PLCs, and telecom base stations requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2918HMS-B1#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 high-reliability analog IC portfolio, emphasizing precision, robustness, and automotive qualification.
The LTC2918 belongs to Linear's voltage supervisor product line, designed specifically for mission-critical power monitoring in harsh environments - delivering guaranteed performance from –40°C to 125°C with minimal external components.
FAQ
What is the function of the MR pin on the LTC2918HMS-B1#TRPBF?
The MR (Manual Reset) pin on the LTC2918HMS-B1#TRPBF is an active-low input with an internal 100kΩ pull-up resistor to VCC. When pulled below 0.2×VCC, it forces the RST output low for the full reset timeout period (e.g., 200ms if RT = VCC). This enables direct push-button reset without external components - a feature exclusive to the LTC2918 family and not present in the LTC2917.
Does the LTC2918HMS-B1#TRPBF support windowed watchdog operation?
Yes, the LTC2918HMS-B1#TRPBF supports windowed watchdog operation as indicated by the "B1" suffix. It enforces both upper (tWDU = 1.6s when WT = VCC) and lower (tWDL = 50ms) timing boundaries on WDI falling edges. If a falling edge occurs before tWDL or after tWDU, RST is asserted - a key reliability feature for safety-critical firmware validation.
What is the minimum VCC voltage required for the LTC2918HMS-B1#TRPBF to assert a valid RST signal?
The LTC2918HMS-B1#TRPBF guarantees RST assertion for VCC ≥ 0.8V, per Absolute Maximum Ratings and Electrical Characteristics. Below 0.8V, RST behavior is undefined. At VCC = 0.8V, the device remains functional enough to drive RST low with ≤15μA sink current - ensuring fail-safe reset during brownout conditions before full power-up.
Can the LTC2918HMS-B1#TRPBF monitor a 12V supply directly?
Yes, the LTC2918HMS-B1#TRPBF can monitor a 12V supply directly using its internal 6.2V shunt regulator on the VCC pin. A series current-limiting resistor (e.g., 11kΩ for 12V) must be placed between the 12V source and VCC to limit input current to ≤5mA. The VM pin is then configured via SEL1/SEL2 = VCC/VCC for 12V threshold monitoring.
How does the LTC2918HMS-B1#TRPBF achieve ±1.5% threshold accuracy over temperature?
The LTC2918HMS-B1#TRPBF achieves ±1.5% threshold accuracy over –40°C to 125°C through factory-trimmed bandgap references and matched resistor ladders inside its comparator matrix. This specification is guaranteed across the full operating temperature range - not just at 25°C - and applies uniformly to all nine selectable thresholds, including ADJ mode referenced to 0.5V.
LTC2918HMS-B1#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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC2918HMS-B1#TRPBF FAQ
1.How can I place an order for LTC2918HMS-B1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918HMS-B1#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 LTC2918HMS-B1#TRPBF reliable?
The price and inventory of LTC2918HMS-B1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2918HMS-B1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2918HMS-B1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918HMS-B1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918HMS-B1#TRPBF?
LTC2918HMS-B1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918HMS-B1#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 LTC2918HMS-B1#TRPBF?
For technical support, including LTC2918HMS-B1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918HMS-B1#TRPBF requirements.
6.How does Aetrix verify that LTC2918HMS-B1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918HMS-B1#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 LTC2918HMS-B1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2918HMS-B1#TRPBF?
All LTC2918HMS-B1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918HMS-B1#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 LTC2918HMS-B1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2918HMS-B1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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