Analog Devices Inc. AD22103KR-REEL7

Overview

AD22103KR-REEL7 from Analog Devices is a ratiometric voltage-output silicon temperature sensor IC designed for direct interface with microcontroller ADCs. It delivers ±0.5°C initial accuracy at +25°C, 28 mV/°C temperature coefficient (ratiometric to supply), and operates from +2.7 V to +3.6 V over 0°C to +100°C. Its TO-92 package enables low-cost thermal coupling in HVAC sensors and industrial control modules.

For engineers reviewing the AD22103KR-REEL7 datasheet, AD22103KR-REEL7 pinout, AD22103KR-REEL7 application, or AD22103KR-REEL7 equivalent, key selection criteria include ratiometric output stability, self-heating error under load (<0.3°C in still air), output drive capability (1 mA max for <0.1°C error), and compatibility with 3.3 V microcontroller ADC references.

Technical Context

The AD22103KR-REEL7 integrates a proprietary temperature-dependent resistor (RT) excited by a supply-proportional current source, generating a linear voltage proportional to both supply and ambient temperature. Its op amp signal conditioning implements the transfer function VOUT = (VS/3.3 V) × [0.25 V + (28 mV/°C) × TA].

Output stage uses a PNP emitter-follower sourcing structure with fixed –100 µA pull-down sink; it drives grounded loads only and tolerates indefinite short-circuit to GND or VS. Thermal response time ranges from 2 sec (aluminum block) to 15 sec (still air), governed by θJA = 190°C/W in unstressed air.

Key Specifications

Pinout & Package

AD22103KR-REEL7 is supplied in a 3-pin TO-92 plastic package (JEDEC TO-226-AA, option T-3-1), with leads formed for through-hole mounting and optimized thermal coupling via epoxy bonding.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ratiometric temperature sensing applications.

Compared with LM35DZ and TSIC506-100, the AD22103KR-REEL7 uniquely combines ratiometric analog output, TO-92 thermal responsiveness, and supply-voltage-tolerant accuracy - making it optimal for cost-constrained, supply-noisy, or thermally dynamic embedded systems where ADC resources are shared.

Availability

AD22103KR-REEL7 is available at Aetrix Electronics and suitable for industrial temperature monitoring, microcontroller-based thermostats, and power supply thermal protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AD22103KR-REEL7 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.

The AD22103KR-REEL7 belongs to Analog Devices' precision temperature sensor family, engineered for direct microcontroller integration with minimal external components and robust performance in thermally variable environments.

FAQ

What is the maximum output current the AD22103KR-REEL7 can safely source while maintaining specified accuracy?

The AD22103KR-REEL7 is characterized for ≤1 mA output current to limit self-heating error to <0.1°C. While its short-circuit current is ~7 mA, sourcing >1 mA increases junction temperature and degrades total error beyond ±0.75°C over temperature. For best accuracy in production designs, keep load impedance ≥3.3 kΩ when VS = 3.3 V. The AD22103KR-REEL7 datasheet specifies this 1 mA limit in the Output Stage Considerations section.

Can the AD22103KR-REEL7 operate from a 5 V supply, and how does that affect its output transfer function?

Yes, the AD22103KR-REEL7 can operate from 5 V, though it exceeds the recommended +3.6 V maximum. At 5 V, the transfer function becomes VOUT = (VS/5 V) × [0.378 V + (42.42 mV/°C) × TA], per the Using the AD22103 with Alternative Supply Voltages section. However, quiescent current rises and self-heating increases - potentially exceeding ±2.5°C total error. The AD22103KR-REEL7 is not characterized or guaranteed for 5 V operation.

Does the AD22103KR-REEL7 require external calibration to achieve ±0.5°C accuracy?

No - the AD22103KR-REEL7 guarantees ±0.5°C initial accuracy at +25°C without calibration. This specification is tested and binned during manufacturing. Full-range accuracy (±2.5°C) includes span and offset errors that can be reduced via two-point calibration; however, the AD22103KR-REEL7's ratiometric architecture means only gain/offset correction is needed - not complex polynomial fitting.

How does the TO-92 package of the AD22103KR-REEL7 impact thermal response compared to SOIC versions?

The TO-92 package gives the AD22103KR-REEL7 faster thermal response than SOIC: τ = 15 sec in still air versus ~25 sec for SOIC_N, due to lower thermal mass and exposed leadframe. Table I confirms θJA = 190°C/W for TO-92 vs. higher for SOIC. Mounting the AD22103KR-REEL7 with thermally conductive epoxy further reduces τ to ~2 sec against aluminum - critical for closed-loop thermal control.

Is the AD22103KR-REEL7 compatible with microcontrollers lacking a dedicated voltage reference pin?

Yes - the AD22103KR-REEL7 is explicitly designed for such systems. Its ratiometric output means both the sensor and the microcontroller's ADC use the same VS rail as reference; supply variations affect both equally and cancel out. The AD22103KR-REEL7's 0.25 V to 3.05 V output range aligns perfectly with 0–3.3 V ADC inputs, eliminating need for external reference or level-shifting circuitry.