Analog Devices Inc. AD22103KT

Overview

AD22103KT from Analog Devices is a ratiometric analog temperature sensor IC in TO-92 package, delivering linear voltage output (0.25 V to 3.05 V over 0°C to +100°C at VS = 3.3 V), ±0.75°C max error over temperature, and 28 mV/°C sensitivity scaled by supply voltage. It serves as a direct interface to microcontroller ADCs in HVAC, industrial monitoring, and battery thermal management systems.

For engineers reviewing the AD22103KT datasheet, AD22103KT pinout, AD22103KT application, or AD22103KT equivalent, this page provides verified package mapping (TO-92, T-3-1), confirmed ratiometric transfer function, absolute accuracy limits, thermal response time constants, and real-world A/D interface design guidance - all validated against Analog Devices Rev. B datasheet.

Technical Context

The AD22103KT uses an internal temperature-dependent resistor excited by a supply-proportional current source, generating a voltage that is both linear with temperature and ratiometric to VS. Its output stage employs a PNP emitter-follower sourcing structure with a fixed ~100 µA pull-down sink, limiting it to grounded-load applications.

It operates across +2.7 V to +3.6 V, draws 350–600 µA quiescent current, and achieves ±0.5°C initial error at +25°C. Thermal self-heating error is calculable via θJA (190°C/W in still air) and power dissipation (~1.5 mW), enabling accurate ambient temperature measurement when mounted with thermally conductive epoxy.

Key Specifications

Pinout & Package

AD22103KT 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 temperature sensor applications.

Compared with LM35DZ and TSIC 506–100, the AD22103KT uniquely delivers guaranteed ±0.75°C accuracy across 0°C to +100°C *with* ratiometric operation on 3.3 V rails - eliminating reference ICs and enabling direct ADC use without signal conditioning or protocol overhead.

Availability

AD22103KT is available at Aetrix Electronics and suitable for industrial motor temperature monitoring, HVAC ambient sensing, and battery pack thermal management requiring stable component supply, long-term lifecycle support, and RoHS-compliant TO-92 packaging.

Supply support for AD22103KT 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The AD22103KT belongs to Analog Devices' precision analog temperature sensor product line, engineered for direct microcontroller ADC interfacing in cost-sensitive industrial, medical, and environmental monitoring applications where ratiometric accuracy and low-power operation are critical.

FAQ

What is the guaranteed temperature accuracy of the AD22103KT over its full operating range?

The AD22103KT guarantees total error of ±0.75°C maximum over its full 0°C to +100°C operating temperature range, as specified in the Rev. B datasheet. This includes contributions from initial offset, span error, and nonlinearity - distinct from the ±0.5°C initial error measured only at +25°C. The AD22103KT maintains this specification under all valid supply voltages (+2.7 V to +3.6 V) and load conditions ≤1 mA.

Can the AD22103KT be used with a 5 V supply, and how does that affect its output?

Yes, the AD22103KT can operate with a 5 V supply, though it exceeds the recommended +2.7 V to +3.6 V range and approaches the +10 V absolute maximum rating. At 5 V, the output becomes VOUT = (5 V / 3.3 V) × [0.25 V + 28 mV/°C × TA], yielding ~0.378 V at 0°C and ~3.78 V at +100°C. However, quiescent current and self-heating increase, potentially degrading accuracy beyond datasheet guarantees; Analog Devices recommends staying within the specified supply range for guaranteed performance.

Does the AD22103KT require external calibration to achieve its specified accuracy?

No, the AD22103KT delivers its guaranteed ±0.75°C total error over 0°C to +100°C without external calibration. The specification includes worst-case initial offset and span error; however, system-level calibration (e.g., two-point at 0°C and +100°C) can reduce residual nonlinearity to ≤0.1% FS (≤0.1°C), further improving resolution for high-precision applications using the AD22103KT.

What is the correct pin configuration for the AD22103KT in TO-92 package?

The AD22103KT in TO-92 (T-3-1) package has bottom-view pinout: Pin 1 = GND, Pin 2 = VO, Pin 3 = VS. This is explicitly defined in the "PIN CONFIGURATIONS" section of the Rev. B datasheet. No NC pin is present in the TO-92 variant - unlike the SOIC version - so all three leads are functional and must be correctly routed to avoid output malfunction or damage.

How does the ratiometric nature of the AD22103KT improve ADC measurement accuracy in microcontroller systems?

The AD22103KT's ratiometric output means its voltage scale and offset both track the supply voltage (VOUT ∝ VS). When the same VS powers both the AD22103KT and the microcontroller's ADC reference, supply variations cancel in the digitized result - e.g., a 5% drop in VS reduces both sensor output and ADC full-scale by 5%, preserving temperature reading integrity. This eliminates errors from LDO tolerance or PCB trace IR drop that would otherwise degrade the AD22103KT measurement.