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Analog Devices Inc. LTC1726HMS8-5#TRPBF
- Part No.:
- LTC1726HMS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1726HMS8-5#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC1726HMS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a triple-supply microprocessor supervisory IC with adjustable reset and watchdog timer functions, designed for systems requiring simultaneous monitoring of 5V, 3.3V, and an adjustable voltage rail. It features ±1.5% threshold accuracy over temperature, 16µA typical supply current, and guaranteed RST assertion down to VCC3 ≥ 1V or VCC5 ≥ 1V. It is used in industrial servers and ruggedized portable instrumentation where reliable power-up sequencing and brownout detection are critical.
For engineers reviewing the LTC1726HMS8-5#TRPBF datasheet, LTC1726HMS8-5#TRPBF pinout, LTC1726HMS8-5#TRPBF application, or LTC1726HMS8-5#TRPBF equivalent, key selection considerations include its H-grade (–40°C to +125°C) operating range, MS8 package compatibility, adjustable reset/watchdog timing via external capacitors, and triple-voltage monitoring architecture with glitch immunity.
Technical Context
The LTC1726HMS8-5#TRPBF integrates three independent voltage comparators (for VCC5 = 4.675V nominal, VCC3 = 3.085V nominal, and VCCA = 1.000V nominal), a programmable reset timer (tRT = 3.30 × CRT), and a programmable watchdog timer (tWT = 21.8 × CWT). Its open-drain RST output is pulled weakly to VCC3 and remains valid across full supply voltage collapse down to 1V on either VCC3 or VCC5.
It supports flexible configuration: monitors all three supplies by default, but can be configured for dual- or single-supply operation. The VCC5 override function disables the 5V monitor when VCC5 ≈ VCC3 ±25mV and VCC5 < 4.15V-enabling seamless transition between 3.3V- and 5V-centric system designs without hardware change.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC5 Threshold | 4.675V ±1.5% (H-grade); ensures precise 5V supply validation before processor release |
| VCC3 Threshold | 3.085V ±1.5% (H-grade); enables robust 3.3V rail supervision in mixed-voltage systems |
| VCCA Threshold | 1.000V ±1.5% (H-grade); supports adjustable rail monitoring (e.g., 1.8V via resistor divider) |
| Supply Current | 16µA typical; allows integration into battery-backed or ultra-low-power embedded systems |
| Operating Temp | –40°C to +125°C (H-grade); qualified for under-hood automotive, industrial control, and telecom infrastructure |
| Reset Timeout | Adjustable via CRT capacitor (tRT = 3.30 × CRT); supports µP initialization delays from ~5ms to >1s |
| Watchdog Timeout | Adjustable via CWT capacitor (tWT = 21.8 × CWT); enables software execution window tuning (e.g., 1s with 47nF) |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.0mm × 3.0mm × 0.86mm body, 0.65mm pitch, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 1) | 3.3V supply sense input & auxiliary power source | Primary power path when ≥1V; must be bypassed with ≥0.1µF ceramic capacitor |
| VCC5 (Pin 2) | 5V supply sense input & auxiliary power source | Enables 5V monitoring; powers internal circuitry if > VCC3; bypass required |
| VCCA (Pin 3) | Adjustable voltage sense input (1V nominal) | Supports custom thresholds (e.g., 1.8V) via resistor divider; high-impedance input |
| GND (Pin 4) | Analog and digital ground reference | Common return for all comparators, timers, and RST output; requires low-impedance connection |
| WDI (Pin 5) | Watchdog input trigger | Rising/falling edge resets watchdog timer; must be toggled within tWT to prevent reset assertion |
| RST (Pin 6) | Active-low open-drain reset output | Asserted during power-up/brownout; weak internal pull-up to VCC3; compatible with 5V logic via external pull-up |
| WT (Pin 7) | Watchdog timeout timing node | Capacitor-to-ground sets tWT (tWT = 21.8 × CWT); grounding disables watchdog |
| RT (Pin 8) | Reset timeout timing node | Capacitor-to-ground sets tRT (tRT = 3.30 × CRT); determines post-power-up reset hold time |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneous validation of 5V, 3.3V, and adjustable rail-eliminates need for multiple discrete supervisors |
| ±1.5% threshold accuracy | Guaranteed over –40°C to +125°C; reduces margining overhead and improves system reliability at temperature extremes |
| Adjustable reset & watchdog | Independent timing via external capacitors (CRT/CWT); enables precise alignment with µP boot sequence and firmware loop timing |
| Glitch-immune reset logic | Immune to sub-130µs supply transients; prevents false resets during noisy power transitions |
| H-grade extended temperature | Qualified to +125°C ambient; suitable for engine control units, base station power modules, and industrial PLCs |
Applications
| Industrial Network Server | Automotive Engine Control Unit |
|---|---|
|
Use Scenario: Monitors 5V main logic, 3.3V I/O, and 1.2V core rails in multi-board server backplane with hot-swap capability. IC Role / Device Role / Timing Role: Triple-supply supervisor ensuring synchronized release of CPU, FPGA, and PHY after stable power-on; RST holds until all rails exceed thresholds and tRT expires. Use Value: Prevents partial initialization failures during brownout recovery; H-grade operation sustains reliability in 70°C chassis environments. |
Use Scenario: Supervises 5V sensor bus, 3.3V MCU domain, and 1.8V ADC reference in under-hood ECU exposed to thermal cycling. IC Role / Device Role / Timing Role: Voltage monitor and watchdog enforcing safe startup and runtime fault detection; WDI tied to MCU GPIO to detect firmware lockup. Use Value: Enables ASIL-B compliant fail-safe behavior; ±1.5% accuracy maintains trip point integrity across –40°C to +125°C ambient. |
| Portable Test Instrument | Ruggedized Data Acquisition Module |
|
Use Scenario: Battery-powered handheld oscilloscope with 5V analog front-end, 3.3V digital controller, and 1.8V ADC supply. IC Role / Device Role / Timing Role: Low-current (16µA) supervisor extending battery life while guaranteeing clean reset during wake-from-sleep transitions. Use Value: Eliminates need for separate reset IC and watchdog; MS8 footprint saves PCB area in space-constrained enclosures. |
Use Scenario: DIN-rail mounted DAQ unit operating in factory-floor environments with wide input voltage variation and EMI exposure. IC Role / Device Role / Timing Role: Glitch-immune supervisor detecting undervoltage on 24V-derived 5V/3.3V rails and asserting RST within 130µs of fault onset. Use Value: Ensures deterministic restart after line sags; VCC5 override mode simplifies design for dual 5V/3.3V supply architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1727-5#TRPBF | Individual open-drain RST outputs per supply (RST3, RST5, RSTA); same thresholds and timing adjustability | Required when independent reset signaling per rail is needed (e.g., staggered power sequencing) | Select LTC1727-5#TRPBF only if discrete reset control per supply is mandatory; otherwise LTC1726HMS8-5#TRPBF offers simpler layout and lower cost |
| LTC1326-5#TRPBF | ±0.75% threshold accuracy (tighter), but fixed 5ms reset timeout and no watchdog; SO-8 only, no MS8 option | Suitable for cost-sensitive, non-watchdog applications where higher accuracy outweighs timing flexibility | Choose LTC1326-5#TRPBF for static, high-accuracy monitoring without software supervision needs; LTC1726HMS8-5#TRPBF preferred when watchdog or adjustable timing is required |
Compared with LTC1727-5#TRPBF, LTC1726HMS8-5#TRPBF consolidates reset signaling into one output-reducing PCB routing complexity-while retaining identical H-grade temperature performance and timing adjustability. Against LTC1326-5#TRPBF, it trades ±0.75% accuracy for field-programmable reset/watchdog periods and broader application coverage in firmware-monitored systems.
Availability
LTC1726HMS8-5#TRPBF is available at Aetrix Electronics and suitable for industrial network servers, automotive engine control units, and ruggedized data acquisition modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1726HMS8-5#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, manufacturing, and qualification for legacy Linear parts including the LTC1726 family.
The LTC1726 series was designed as a micropower, high-accuracy triple-supply supervisor targeting systems with mixed-voltage domains and stringent reliability requirements in industrial, automotive, and computing applications.
FAQ
What is the operating temperature range for the LTC1726HMS8-5#TRPBF?
The LTC1726HMS8-5#TRPBF is rated for –40°C to +125°C (H-grade), making it suitable for under-hood automotive, industrial control, and telecom infrastructure applications where ambient temperatures exceed standard commercial grade limits. This rating is verified per Linear Technology's characterization and correlation with statistical process controls.
How does the VCC5 override function work in the LTC1726HMS8-5#TRPBF?
In the LTC1726HMS8-5#TRPBF, the VCC5 override disables the 5V monitor when VCC5 ≈ VCC3 ±25mV and VCC5 < 4.15V-effectively reconfiguring the device as a 3.3V + adjustable rail monitor. This occurs automatically without external logic, enabling flexible use in systems where 3.3V and 5V rails may share close voltage levels during power-up.
Can the LTC1726HMS8-5#TRPBF monitor only two supplies instead of three?
Yes, the LTC1726HMS8-5#TRPBF can be configured to monitor just two supplies-for example, by tying VCCA to VCC3 or leaving it unconnected (with appropriate biasing), or by using the VCC5 override to disable the 5V channel. The datasheet confirms this configurability for systems with reduced supply count requirements.
What capacitor values set typical reset and watchdog timeouts for the LTC1726HMS8-5#TRPBF?
A 47nF capacitor on RT yields a 155ms reset timeout (tRT = 3.30 × CRT), and a 47nF capacitor on WT yields a 1s watchdog timeout (tWT = 21.8 × CWT). These values are confirmed in the LTC1726HMS8-5#TRPBF Typical Application schematics and electrical characteristics tables.
Is the RST output of the LTC1726HMS8-5#TRPBF compatible with 5V logic interfaces?
Yes-the RST output of the LTC1726HMS8-5#TRPBF is an open-drain structure with a weak internal pull-up to VCC3, but it supports external pull-up to 5V. The datasheet specifies VOL ≤ 0.4V at ISINK = 2.5mA with VCC5/VCC25 = 0V, confirming interoperability with 5V CMOS inputs when appropriately biased.
LTC1726HMS8-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 3.085V, 4.675V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1726HMS8-5#TRPBF FAQ
1.How can I place an order for LTC1726HMS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1726HMS8-5#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 LTC1726HMS8-5#TRPBF reliable?
The price and inventory of LTC1726HMS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1726HMS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1726HMS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1726HMS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1726HMS8-5#TRPBF?
LTC1726HMS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1726HMS8-5#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 LTC1726HMS8-5#TRPBF?
For technical support, including LTC1726HMS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1726HMS8-5#TRPBF requirements.
6.How does Aetrix verify that LTC1726HMS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1726HMS8-5#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 LTC1726HMS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1726HMS8-5#TRPBF?
All LTC1726HMS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1726HMS8-5#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 LTC1726HMS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1726HMS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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