Analog Devices Inc. LT6660HCDC-3.3#TRMPBF

Overview

LT6660HCDC-3.3#TRMPBF from Analog Devices (acquired Linear Technology) is a micropower series voltage reference delivering 3.3V output with ±0.2% initial accuracy, 20ppm/°C max temperature coefficient, and guaranteed 20mA sourcing capability in a 3-lead 2mm × 2mm DFN package. It operates from V_IN = V_OUT + 0.9V to 20V and requires no output capacitor-enabling use in precision A/D converters and handheld instrumentation where board space and fast settling are critical.

For engineers reviewing the LT6660HCDC-3.3#TRMPBF datasheet, LT6660HCDC-3.3#TRMPBF pinout, LT6660HCDC-3.3#TRMPBF application, or LT6660HCDC-3.3#TRMPBF equivalent, key selection considerations include its 145–180µA supply current at 3.3V, reverse-battery protection, 0.9V dropout voltage at zero load, and hysteresis of ≤50ppm over 0°C to 70°C.

Technical Context

The LT6660HCDC-3.3#TRMPBF uses curvature-compensated bandgap architecture with laser-trimmed thin-film resistors to achieve low drift and high accuracy. Its series topology eliminates the need for an external current-setting resistor, unlike shunt references, enabling dynamic power savings in battery-powered systems.

It features intrinsic stability with 0µF output capacitance, supports capacitive loads up to 1µF at 10mA (per Table 1), and integrates reverse-battery protection to block conduction below –15V. Thermal regulation is specified at 2.5ppm/mW, and long-term stability is 100ppm/√kHr.

Key Specifications

Pinout & Package

LT6660HCDC-3.3#TRMPBF is housed in a 3-lead plastic DFN package (2mm × 2mm × 0.75mm) with exposed pad soldered to GND. The package complies with JEDEC MO-229 variation W-TBD and supports IR reflow with ≤0.02% typical V_OUT shift.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1460CIS8-3.3#TRPBF and ADR3433ARJZ-R7, the LT6660HCDC-3.3#TRMPBF uniquely balances 0.2% accuracy, 20ppm/°C drift, 20mA drive, and capacitor-free operation in a 2mm × 2mm DFN-making it optimal for space-constrained, medium-current precision systems.

Availability

LT6660HCDC-3.3#TRMPBF is available at Aetrix Electronics and suitable for precision ADC references, handheld instrumentation, and low-power sensor modules requiring stable component supply with full traceability and long-lifecycle support.

Supply support for LT6660HCDC-3.3#TRMPBF 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 LT6660 family was designed by Linear Technology (now part of ADI) specifically for micropower, high-accuracy series reference applications in space-constrained, battery-operated systems-emphasizing low drift, no-output-capacitor stability, and robust thermal performance.

FAQ

What is the minimum input voltage required for stable operation of the LT6660HCDC-3.3#TRMPBF?

The LT6660HCDC-3.3#TRMPBF requires V_IN ≥ V_OUT + 0.9V for regulation, meaning a minimum input of 4.2V at 25°C. This dropout voltage increases to 1.3–1.4V at 10mA load. Operation below this threshold results in unregulated output, so designs must maintain headroom across temperature and load extremes. The LT6660HCDC-3.3#TRMPBF datasheet specifies absolute maximum input as 30V.

Does the LT6660HCDC-3.3#TRMPBF require an output capacitor for stability?

No, the LT6660HCDC-3.3#TRMPBF is explicitly designed to be stable with 0µF output capacitance, eliminating the need for external compensation. This feature reduces BOM count, saves PCB area, and improves transient response-critical in intrinsic safety and fast-settling applications. Capacitive loads up to 1µF are supported at ≤10mA per Table 1 in the LT6660HCDC-3.3#TRMPBF datasheet.

What is the supply current range of the LT6660HCDC-3.3#TRMPBF across temperature and load?

The LT6660HCDC-3.3#TRMPBF draws 145–180µA typical supply current at 25°C and 0°C to 70°C, with max of 220µA. This current remains stable across load (0–20mA) and input voltage (4.2–20V), as confirmed in Figure G05 and Electrical Characteristics table. The LT6660HCDC-3.3#TRMPBF does not exhibit significant load-dependent quiescent current variation.

How does reverse-battery protection function in the LT6660HCDC-3.3#TRMPBF?

The LT6660HCDC-3.3#TRMPBF incorporates internal circuitry that blocks reverse current flow when V_IN falls below GND, with leakage limited to ≤10µA at –15V (per Absolute Maximum Ratings). This protects downstream circuitry during incorrect battery installation in portable devices. Unlike discrete diode solutions, this feature adds no forward voltage drop or thermal penalty during normal operation. The LT6660HCDC-3.3#TRMPBF maintains full specification compliance under reverse-bias conditions.

What is the long-term stability specification for the LT6660HCDC-3.3#TRMPBF?

The LT6660HCDC-3.3#TRMPBF has a long-term stability of 100ppm/√kHr, measured over >1000 hours on PC-board-mounted units at 30°C ambient. This value reflects real-world aging behavior-not accelerated test extrapolation-and applies to the LT6660HCDC-3.3#TRMPBF across all output voltages. Drift follows a logarithmic trend, with second-thousand-hour drift typically less than one-third of the first.