Analog Devices Inc. LTC2918HDDB-A1#TRPBF

Overview

LTC2918HDDB-A1#TRPBF from Analog Devices (formerly Linear Technology) is a high-temperature voltage supervisor IC with manual reset input, 9 selectable supply thresholds (12V to ADJ/0.5V), fixed –5% tolerance, and adjustable watchdog timer. It operates from 1.5V to 5.5V, consumes 30μA typical quiescent current, guarantees ±1.5% threshold accuracy over –40°C to +125°C, and delivers reliable reset assertion down to VCC ≥ 0.8V. It is used in automotive control systems requiring robust power-on reset and fault recovery under extreme thermal conditions.

For engineers reviewing the LTC2918HDDB-A1#TRPBF datasheet, LTC2918HDDB-A1#TRPBF pinout, LTC2918HDDB-A1#TRPBF application, or LTC2918HDDB-A1#TRPBF equivalent, this page provides verified technical context, exact pin functions, real-world timing values (e.g., 200ms internal RST timeout, 1.6s internal WDT upper bound), package dimensions (3mm × 2mm DFN), and two validated alternative parts for functional substitution in high-reliability embedded designs.

Technical Context

The LTC2918HDDB-A1#TRPBF implements a dual-stage monitoring architecture: an accurate voltage comparator on VM referenced to internally trimmed thresholds selected via SEL1/SEL2, and a windowed watchdog logic block (A1 version uses standard watchdog; B1 enables lower-bound detection). Its RST output is open-drain with guaranteed low-voltage operation (VOL ≤ 0.2V at 100μA, VCC = 1V) and glitch immunity via 100μs minimum pulse rejection.

It integrates a 6.2V shunt regulator on VCC for direct 12V supply operation (with external series resistor), supports manual reset via MR (100kΩ internal pull-up, 250ns minimum pulse width), and offers three reset timeout options: ~400μs (RT open), ~200ms (RT tied to VCC), or externally adjustable (9ms/nF with CRT to GND).

Key Specifications

Pinout & Package

Package: 10-lead (3mm × 2mm) plastic DFN with exposed pad (pin 11, optional GND connection); rated for –40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326US29D3+T and TPS3808G18DBVR, LTC2918HDDB-A1#TRPBF provides unique value in configurable multi-rail supervision, integrated manual reset, and guaranteed operation to 125°C - making it irreplaceable in thermally demanding, multi-supply automotive and industrial systems where flexibility and reliability are non-negotiable.

Availability

LTC2918HDDB-A1#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, telecom base station power sequencing, and medical diagnostic imaging systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2918HDDB-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2918 belongs to ADI's precision power monitoring product line, engineered specifically for mission-critical applications demanding guaranteed operation across extreme temperatures, high noise immunity, and flexible configuration without external passive components.

FAQ

What is the operating temperature range for LTC2918HDDB-A1#TRPBF?

The LTC2918HDDB-A1#TRPBF is rated for –40°C to +125°C operation, with full electrical specifications guaranteed across this range. This H-grade qualification makes it suitable for under-hood automotive applications and industrial environments where thermal stress exceeds commercial or industrial grade limits. The DFN package's low θJA (43°C/W) supports reliable heat dissipation at maximum junction temperature.

Does LTC2918HDDB-A1#TRPBF support adjustable watchdog timeout?

Yes, LTC2918HDDB-A1#TRPBF supports adjustable watchdog timeout via external capacitor CWT on the WT pin (72ms/nF scaling), or fixed timeouts: ~3.2ms (WT open), ~1.6s (WT tied to VCC), or disabled (WT tied to GND). As an A1 variant, it implements standard watchdog behavior - requiring only periodic WDI toggling within the upper bound, unlike B1 versions which enforce windowed timing with lower-bound detection.

How does the manual reset (MR) function work on LTC2918HDDB-A1#TRPBF?

The MR pin on LTC2918HDDB-A1#TRPBF is an active-low input with a 100kΩ internal pull-up to VCC, enabling direct connection to a momentary pushbutton without external components. Asserting MR low while RST is high initiates a reset cycle: RST goes low for the configured timeout (e.g., 200ms), then releases. The pin accepts pulses as short as 250ns and tolerates leakage up to ±5μA in open state, ensuring robust field-service reset capability.

Can LTC2918HDDB-A1#TRPBF monitor a 12V supply directly?

Yes, LTC2918HDDB-A1#TRPBF can monitor a 12V supply directly using its integrated 6.2V shunt regulator on the VCC pin. A series current-limiting resistor (e.g., 11kΩ for 12V input) must be placed between the 12V source and VCC to limit input current to ≤5mA. The VM pin is then connected to the 12V rail (or a resistive divider for precise threshold setting), and SEL1/SEL2 configured for 12V mode (both tied to VCC) to activate the 12V × 0.95 = 11.4V trip point.

What is the reset timeout behavior when VCC falls below 1.5V?

When VCC drops below the 1.5V undervoltage lockout (UVLO) threshold, LTC2918HDDB-A1#TRPBF forces RST low regardless of VM state - ensuring fail-safe reset during brownout. RST remains asserted until VCC rises above UVLO and VM exceeds the selected threshold, after which the internal 200ms timer starts. Below 0.8V, RST is guaranteed active, providing reliable reset even during deep power collapse.