Analog Devices Inc. LT6657AHMS8-5#TRPBF

Overview

LT6657AHMS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a precision 5V buffered voltage reference IC with 0.1% initial accuracy, 1.5ppm/°C max temperature drift, and 0.5ppm_P-P (0.1Hz–10Hz) low-frequency noise. It operates from VIN ≥ VOUT + 50mV up to 40V, sources/sinks ±10mA, and supports shunt/negative-reference configurations in high-resolution data acquisition systems.

For engineers reviewing the LT6657AHMS8-5#TRPBF datasheet, LT6657AHMS8-5#TRPBF pinout, LT6657AHMS8-5#TRPBF application, or LT6657AHMS8-5#TRPBF equivalent, key selection criteria include guaranteed 1.5ppm/°C drift over –40°C to 125°C, <2µV/mA load regulation, reverse-battery protection, shutdown current <4µA, and MSOP-8 package compatibility with space-constrained industrial instrumentation layouts.

Technical Context

The LT6657AHMS8-5#TRPBF implements curvature-compensated bandgap architecture with an integrated error amplifier and low-impedance buffered output stage. Its dual-mode operation-series regulation (VIN > VOUT) and shunt/negative mode (VIN ≤ VOUT)-enables flexible system-level voltage referencing without external components.

It features active shutdown control (SHDN pin), thermal shutdown, reverse supply/output protection, and internal current limiting. The device maintains specified performance across –40°C to 125°C junction temperature, with hysteresis ≤35ppm over full temperature cycling and long-term drift of 30ppm/√kHr.

Key Specifications

Pinout & Package

LT6657AHMS8-5#TRPBF is housed in an 8-lead plastic MSOP (MS8) package with exposed pad (θ_JA = 273°C/W). Pins 1, 5, 7, and 8 are DNC (internally connected, must remain unconnected). Only pins 2 (VIN), 3 (SHDN), 4 (GND), and 6 (VOUT) are functional.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5050IDR and ADR4550BRZ, the LT6657AHMS8-5#TRPBF uniquely combines ultra-low drift, sub-microvolt noise, bidirectional current drive, and comprehensive fault protection in a compact MSOP-8 package-making it optimal for space-constrained, high-reliability industrial and automotive systems requiring both precision and ruggedness.

Availability

LT6657AHMS8-5#TRPBF is available at Aetrix Electronics and suitable for high-resolution data acquisition systems, industrial process controllers, and automotive battery monitoring applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LT6657AHMS8-5#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The LT6657 family was designed specifically for demanding industrial, medical, and test equipment applications where low drift, ultra-low noise, and operational flexibility (shunt/negative mode, wide supply range) are essential for maintaining measurement integrity.

FAQ

What is the guaranteed initial accuracy of the LT6657AHMS8-5#TRPBF?

The LT6657AHMS8-5#TRPBF has a guaranteed initial output voltage accuracy of ±0.1% (±5mV) at 25°C, as specified in the Electrical Characteristics table under "Output Voltage Accuracy." This tolerance applies across the full –40°C to 125°C operating temperature range for the A-grade device, ensuring predictable calibration performance without post-manufacture trimming.

Can the LT6657AHMS8-5#TRPBF be used as a negative voltage reference?

Yes, the LT6657AHMS8-5#TRPBF can operate as a negative voltage reference by connecting VIN to ground and using VOUT as the –5V output node while sinking current into the device. This configuration is explicitly supported in the datasheet's "Positive or Negative Shunt Mode Operation" section and leverages its symmetrical ±10mA sink/source capability and reverse-output protection.

What is the minimum input-to-output voltage differential required for regulation in sourcing mode?

In sourcing mode, the LT6657AHMS8-5#TRPBF requires a minimum VIN – VOUT differential of 50mV (guaranteed) to maintain regulation at 25°C and full load. At –40°C or 125°C, the typical dropout increases to 330mV at 10mA sourcing, as shown in the Electrical Characteristics table under "Minimum VIN – VOUT."

Does the LT6657AHMS8-5#TRPBF require external capacitors, and if so, what values?

Yes: a minimum 0.1µF ceramic capacitor is required between VIN and GND, and a minimum 1µF ceramic capacitor between VOUT and GND. For the 5V version, these values ensure stability, optimal PSRR, and low-noise performance. Larger values (e.g., 10µF tantalum + 1µF ceramic) improve transient response but require ESR < 0.5Ω to avoid instability.

How does the LT6657AHMS8-5#TRPBF handle reverse battery conditions?

The LT6657AHMS8-5#TRPBF includes built-in reverse supply protection, allowing it to withstand –40V applied to the VIN pin relative to GND without damage or latch-up. This feature is validated in the Absolute Maximum Ratings table and makes the device suitable for automotive applications where battery polarity reversal may occur during service or jump-start events.