Analog Devices Inc. LTC6655BHLS8-5

Overview

LTC6655BHLS8-5 from Analog Devices is a precision bandgap voltage reference delivering 5.000 V output with ±0.025% initial accuracy, 2 ppm/°C max temperature drift, and 0.25 ppm_P-P (0.1–10 Hz) low-frequency noise. Packaged in an 8-lead hermetic LS8 (5 mm × 5 mm) ceramic LCC, it operates from –40°C to 125°C and supports ±5 mA load current - ideal for high-resolution data acquisition systems requiring long-term stability and minimal thermal hysteresis.

For engineers reviewing the LTC6655BHLS8-5 datasheet, LTC6655BHLS8-5 pinout, LTC6655BHLS8-5 application, or LTC6655BHLS8-5 equivalent, key selection criteria include its LS8 package's 30 ppm thermal hysteresis (–40°C to 85°C), 20 ppm/√kHr long-term drift, humidity immunity, and dual-force/sense output architecture enabling sub-10 ppm/mA load regulation under sourcing and sinking conditions.

Technical Context

The LTC6655BHLS8-5 implements advanced curvature-compensated bandgap topology with separate force (VOUT_F) and sense (VOUT_S) outputs, enabling Kelvin sensing to reject trace resistance errors. Its internal 2 mA sense current on VOUT_S establishes precise load regulation independent of load current magnitude.

It features active shutdown with <20 µA quiescent current, operates down to VIN = VOUT + 0.5 V (5.5 V min), and maintains performance up to 13.2 V supply. The LS8 package's hermetic ceramic construction eliminates humidity-induced drift and delivers superior mechanical stability versus plastic MSOP variants.

Key Specifications

Pinout & Package

Package: 8-lead ceramic LCC (LS8), 5 mm × 5 mm, hermetic, surface-mount. Pin 4 is main GND; Pins 3, 5, and 8 are internal GND terminals requiring connection to PCB ground plane.

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 LTC6655BHLS8-5 uniquely combines hermetic LS8 packaging, force/sense architecture, and guaranteed shutdown capability - making it the only option qualified for automotive-grade, long-life, high-precision instrumentation where humidity, thermal cycling, and power sequencing are design constraints.

Availability

LTC6655BHLS8-5 is available at Aetrix Electronics and suitable for high-resolution data acquisition systems, automotive ADAS calibration modules, and medical patient monitor front-ends requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for LTC6655BHLS8-5 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC6655 family was designed specifically for metrology-grade applications demanding ultra-low noise, sub-ppm drift, and long-term stability - with the BH-grade LS8 variant targeting mission-critical automotive and aerospace systems.

FAQ

What is the maximum allowable input voltage for the LTC6655BHLS8-5?

The LTC6655BHLS8-5 supports a maximum supply voltage of 13.2 V across its VIN-to-GND rating. Exceeding this value risks permanent damage per Absolute Maximum Ratings. Operation above 13.2 V - even momentarily - may degrade long-term stability or cause latch-up. For robust designs, maintain VIN ≤ 13.0 V with appropriate margin, especially in automotive transients where load-dump events require external clamping.

Does the LTC6655BHLS8-5 require external capacitors, and if so, what values?

Yes, the LTC6655BHLS8-5 requires a 0.1 µF or larger ceramic capacitor between VIN and GND, placed as close as possible to the device. An output capacitor of 2.7 µF to 100 µF is mandatory between VOUT_F and GND. For optimal noise and stability, use X7R or film capacitors with ESR ≤ 0.1 Ω at 100 kHz; avoid piezoelectric-sensitive ceramics in ultra-low-noise layouts.

How does the force/sense architecture of the LTC6655BHLS8-5 improve accuracy?

The LTC6655BHLS8-5 uses separate VOUT_F (force) and VOUT_S (sense) pins to implement Kelvin sensing. VOUT_S sinks a fixed 2 mA, allowing measurement of voltage drop across PCB traces. This feedback enables the internal regulator to compensate for IR losses, achieving <15 ppm/mA load regulation - far superior to single-output references where trace resistance directly corrupts output accuracy.

Is the LTC6655BHLS8-5 pin-compatible with other members of the LTC6655 family?

Yes, the LTC6655BHLS8-5 shares identical pinout and footprint with all LS8-package variants (e.g., LTC6655BHLS8-2.5, LTC6655BHLS8-4.096). It is also pin-compatible with the MS8-package versions electrically, though mechanical mounting differs due to LS8's leadless ceramic construction and thermal pad absence.

What is the thermal hysteresis specification for the LTC6655BHLS8-5, and why does it matter?

The LTC6655BHLS8-5 exhibits 30 ppm thermal hysteresis over –40°C to 85°C - measured as output voltage deviation after cycling between temperature extremes and returning to 25°C. This matters because hysteresis introduces non-repeatable error in instruments subjected to ambient cycling (e.g., outdoor test equipment), and the LS8's hermetic construction minimizes this effect versus plastic-packaged alternatives.