Analog Devices Inc. AD22103KR

Overview

AD22103KR from Analog Devices is a ratiometric analog voltage-output temperature sensor IC in TO-92 package, delivering ±0.75°C max total error over 0°C to +100°C, 28 mV/°C temperature coefficient, and 0.25 V to 3.05 V output range at 3.3 V supply - used for precision thermal monitoring in microcontroller-based embedded systems.

For engineers reviewing the AD22103KR datasheet, AD22103KR pinout, AD22103KR application, or AD22103KR equivalent, this page provides verified package mapping (TO-92, T-3-1), confirmed transfer function V_OUT = (V_S/3.3 V) × [0.25 V + (28 mV/°C) × T_A], absolute accuracy limits, thermal response data, and real-world A/D interface guidance.

Technical Context

The AD22103KR integrates a proprietary temperature-dependent resistor (RTD-like) excited by a supply-proportional current source, enabling ratiometric operation that eliminates sensitivity to power supply variation. Its op amp signal conditioning block applies fixed gain and offset to achieve linear voltage output directly proportional to ambient temperature.

Output stage uses a PNP emitter-follower sourcing structure with ~7 mA short-circuit capability and a fixed –100 µA pull-down sink; it drives grounded loads only and requires output current ≤1 mA for optimal accuracy and minimal self-heating. Thermal time constant ranges from 2 sec (aluminum block) to 15 sec (still air), dependent on mounting medium.

Key Specifications

Pinout & Package

AD22103KR is supplied in JEDEC-compliant TO-92 plastic header-style package (T-3-1), with 3 leads and bottom-view pinout: Pin 1 = GND, Pin 2 = VO, Pin 3 = VS. NC terminal is absent in this variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog voltage-output temperature sensor applications.

Compared with LM35DZ and TSIC 506-100, the AD22103KR uniquely combines guaranteed ±0.75°C error, ratiometric 3.3 V compatibility, TO-92 mechanical simplicity, and zero-code analog integration - making it optimal for cost-sensitive, high-volume embedded thermal monitoring where supply rail sharing and PCB space are critical constraints.

Availability

AD22103KR is available at Aetrix Electronics and suitable for industrial motor control, smart thermostats, medical diagnostic equipment, and power supply thermal management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AD22103KR 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD22103KR belongs to Analog Devices' precision analog temperature sensor product line, engineered specifically for ratiometric, low-cost, single-supply thermal measurement in microcontroller-based systems without external references or calibration.

FAQ

What is the guaranteed temperature accuracy of the AD22103KR over its full operating range?

The AD22103KR guarantees ±0.75°C maximum total error across its 0°C to +100°C operating range, including contributions from initial offset, span error, and nonlinearity. This specification is validated per Analog Devices Rev. B datasheet and applies under standard test conditions with supply voltage between +2.7 V and +3.6 V. The AD22103KR achieves this without factory calibration, supporting plug-and-play deployment in cost-sensitive applications.

Can the AD22103KR operate from a 5 V supply, and how does that affect its output?

Yes, the AD22103KR can operate from a 5 V supply, though its specified operating range is +2.7 V to +3.6 V. At 5 V, the transfer function scales per its ratiometric design: V_OUT = (5 V / 3.3 V) × [0.25 V + (28 mV/°C) × T_A], yielding ~0.378 V at 0°C and ~3.75 V at +100°C. However, exceeding +3.6 V voids guaranteed specifications and risks reliability; AD22103KR is not characterized for sustained 5 V operation.

Is the AD22103KR pin-compatible with other variants like AD22103KTZ?

No, the AD22103KR is not pin-compatible with AD22103KTZ. AD22103KR uses the TO-92 (T-3-1) package with 3-pin bottom-view layout (GND–VO–VS), while AD22103KTZ uses SOIC_N (R-8) with 8 pins and different pin assignments - including NC terminals. Mechanical and electrical pinout mismatch prevents direct substitution without PCB redesign.

Does the AD22103KR require external components for basic operation?

No, the AD22103KR requires only bypass capacitance (recommended 0.1 µF ceramic from VS to GND) for stable operation. Its ratiometric architecture eliminates need for external voltage references, op amps, or calibration resistors. For microcontroller ADC interfacing, a simple RC filter (e.g., 1 kΩ + 100 nF) is advised to suppress charge-injection glitches - but not required for functionality. The AD22103KR delivers full-spec performance with just power and ground connections.

What is the thermal time constant of the AD22103KR in still air, and how does mounting affect it?

The AD22103KR exhibits a thermal time constant (τ) of 15 seconds in still air, defined as time to reach 63.2% of final temperature change. Mounting directly to an aluminum block reduces τ to 2 seconds; moving air (1200 CFM) yields τ = 3.5 seconds. These values are measured per Analog Devices Rev. B characterization and reflect actual thermal mass and conduction paths - not simulated estimates. Proper thermal coupling via conductive epoxy is essential to achieve sub-5 sec response in dynamic systems.