Analog Devices Inc. LTC2917HMS-A1#TRPBF

Overview

LTC2917HMS-A1#TRPBF from Analog Devices (formerly Linear Technology) is a high-temperature voltage supervisor IC with 9 selectable nominal thresholds (12V to ADJ), ±1.5% threshold accuracy over –40°C to 125°C, 30μA quiescent current, and internal 200ms reset timeout. It monitors power supplies in automotive control systems and industrial embedded devices where guaranteed operation at 125°C and glitch-immune reset assertion are critical.

For engineers reviewing the LTC2917HMS-A1#TRPBF datasheet, LTC2917HMS-A1#TRPBF pinout, LTC2917HMS-A1#TRPBF application, or LTC2917HMS-A1#TRPBF equivalent, key selection criteria include its A1 variant's fixed –5% tolerance (no TOL pin function), MSOP-10 package, absence of manual reset (LTC2918-only feature), and windowed watchdog exclusion (B1 version only).

Technical Context

The LTC2917HMS-A1#TRPBF implements a precision comparator-based supervision architecture with three-state SEL1/SEL2 inputs selecting one of nine internal reference voltages, and no TOL pin functionality-confirming it is the A1 variant with fixed –5% tolerance. Its reset logic asserts RST low when VM falls below the selected threshold and holds for an internal 200ms timeout after recovery.

It features glitch filtering with <150μs minimum detectable glitch duration and guaranteed RST assertion down to VCC ≥ 0.8V. The device operates from 1.5V to 5.5V supply and includes a 6.2V shunt regulator enabling direct 12V input via series resistor, supporting high-voltage automotive monitoring without external regulators.

Key Specifications

Pinout & Package

Package: 10-Lead MSOP (3mm × 3mm), RoHS-compliant, exposed pad optional for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with LTC2917IMS-A1#TRPBF, the LTC2917HMS-A1#TRPBF provides guaranteed 125°C operation essential for under-hood use, while TPS3808G33DBVR trades configurability and temperature range for smaller footprint and lower unit cost in fixed-threshold systems.

Availability

LTC2917HMS-A1#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, and telecom base station power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2917HMS-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC2917 product line delivers precision, low-power voltage supervision for mission-critical systems where reliability across extreme temperatures and supply noise immunity are mandatory design requirements.

FAQ

What is the maximum supply voltage the LTC2917HMS-A1#TRPBF can tolerate on its VCC pin?

The LTC2917HMS-A1#TRPBF has an absolute maximum VCC rating of 5.7V for direct connection. However, it integrates a 6.2V shunt regulator-enabling operation from higher voltages (e.g., 12V automotive battery) when a series current-limiting resistor is used to restrict VCC pin current to ≤5mA. This makes LTC2917HMS-A1#TRPBF suitable for direct high-voltage monitoring without external regulators.

Does the LTC2917HMS-A1#TRPBF support manual reset functionality?

No, the LTC2917HMS-A1#TRPBF does not support manual reset. Manual reset (MR pin) is exclusive to the LTC2918 family. The LTC2917HMS-A1#TRPBF is the A1 variant of the LTC2917, which lacks both MR and TOL pins-its tolerance is fixed at –5%. For manual reset capability, engineers must select an LTC2918HMS-A1#TRPBF instead.

How does the watchdog timer behave on the LTC2917HMS-A1#TRPBF?

The LTC2917HMS-A1#TRPBF implements the A1 version watchdog: it requires only that the WDI pin toggles (falling edge) before the upper timeout boundary (1.6s internal, or adjustable via WT capacitor). Unlike B1 versions, it does not enforce a lower boundary window-making LTC2917HMS-A1#TRPBF appropriate for software with variable execution timing where strict windowing is unnecessary.

Can the LTC2917HMS-A1#TRPBF monitor a 1.2V supply, and what is the guaranteed accuracy?

Yes, the LTC2917HMS-A1#TRPBF supports 1.2V monitoring using SEL1=GND and SEL2=VCC. At 1.2V nominal with –5% tolerance, the trip point is 1.14V, and accuracy is guaranteed at ±1.5% of 1.2V (±18mV) over –40°C to 125°C-resulting in a validated trip range of 1.122V to 1.158V. This meets stringent requirements for low-voltage SoC core rail supervision.

What is the purpose of the RT pin on the LTC2917HMS-A1#TRPBF, and how is it configured for 200ms reset timeout?

The RT pin sets the reset timeout period. To achieve the standard 200ms internal timeout, the RT pin must be tied directly to VCC. Leaving RT open yields ~400μs, while connecting an external capacitor to GND allows adjustable timing (≈110pF/ms). This flexibility lets designers optimize reset hold time without adding passive components unless needed-simplifying layout for most applications using LTC2917HMS-A1#TRPBF.