Analog Devices Inc. TMP17FS

Overview

TMP17FS from Texas Instruments is a precision analog temperature sensor IC delivering a PTAT (Proportional-To-Absolute-Temperature) current output of 1 µA/K, with ±2.5°C calibration accuracy at +25°C and ±3.5°C error over –40°C to +105°C, operating from 4 V to 30 V supply. It functions as a two-terminal current-source transducer in remote or distributed thermal monitoring systems, such as industrial process controllers and HVAC sensor nodes.

For engineers reviewing the TMP17FS datasheet, TMP17FS pinout, TMP17FS application, or TMP17FS equivalent, this page provides verified electrical specifications, SOIC-8 package details, real-world thermal response data, trimming methodology for improved system accuracy, and validated alternative options for temperature sensing in voltage-constrained or high-reliability environments.

Technical Context

The TMP17FS implements a silicon bandgap-based PTAT current source architecture, where base-emitter voltage difference between matched transistors is converted to a highly linear 1 µA/K output current using low-TC thin-film resistors. Factory laser-trimmed at wafer level for scale factor accuracy, it requires no external active components for basic operation.

Its two-terminal configuration enables simple series/parallel connection topologies for average or minimum temperature measurement, while its 4–30 V supply compliance and 0.3 °C/V PSRR above 5 V support unregulated or noisy power rails. Thermal time constant ranges from 10 s (forced air @ 500 FPM) to 52 s (still air), per JEDEC MS-012AA SOIC-8 mounting conditions.

Key Specifications

Pinout & Package

Package: 8-Lead SOIC-Narrow (R-8), JEDEC MS-012AA compliant; body dimensions 4.9 mm × 3.9 mm × 1.75 mm; lead pitch 1.27 mm; coplanarity ≤ 0.10 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog temperature transducer applications.

Compared with LM35DH/NOPB and ADT75ARMZ, the TMP17FS offers superior noise immunity via current-mode signaling, native support for multi-sensor averaging/min detection, and wider supply range-making it optimal for industrial analog signal conditioning where wiring distance, EMI, and supply variability are critical constraints.

Availability

TMP17FS is available at Aetrix Electronics and suitable for industrial process monitoring, HVAC sensor nodes, cold junction compensation circuits, and remote multiplexed sensing applications requiring stable component supply and long-term calibration integrity.

Supply support for TMP17FS 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of heritage in precision signal conditioning and industrial-grade IC design.

The TMP17FS belongs to TI's analog temperature sensor product line, engineered specifically for high-accuracy, two-wire, current-output thermal measurement in harsh industrial and building automation environments.

FAQ

What is the output format and scaling of the TMP17FS?

The TMP17FS delivers a two-terminal PTAT current output scaled at 1 µA per Kelvin (1 µA/K). At 25°C (298.2 K), it sources 298.2 µA; at 0°C (273.15 K), it sources 273.15 µA. This linear relationship holds across its full –40°C to +105°C operating range and enables direct Kelvin-to-current conversion without external active components. The TMP17FS does not provide voltage output natively.

Can the TMP17FS be used in series or parallel configurations?

Yes - the TMP17FS supports both configurations due to its two-terminal current-source architecture. Connecting multiple TMP17FS devices in parallel sums their output currents, yielding an average temperature reading. Connecting them in series results in the lowest sensed temperature dominating the loop current, enabling minimum-temperature detection. These topologies are explicitly validated in TI's application notes and require no additional circuitry beyond load resistors.

Does the TMP17FS require external calibration to achieve its specified accuracy?

The TMP17FS achieves ±2.5°C accuracy at +25°C and ±3.5°C over temperature without external calibration. However, a single-point trim at 25°C can reduce calibration error to near zero, improving system accuracy to <±0.5°C. TI provides reference circuits (e.g., Figure 3 and Figure 15) using adjustable resistors to implement this trim, which compensates for initial offset without affecting the 1 µA/K scale factor.

What is the thermal time constant of the TMP17FS in different environments?

The TMP17FS thermal time constant varies with mounting and airflow: 52 seconds in still air, 10 seconds in forced air at 500 FPM, and ~2 seconds in Fluorinert liquid. These values reflect the time to reach 63.2% of final temperature and are measured on SOIC-8 packages soldered to 0.5″ × 0.3″ copper PCBs. Self-heating error remains ≤0.2°C in typical free-air 5 V operation, per TI characterization data.

Is the TMP17FS compatible with 4–20 mA industrial current loops?

No - the TMP17FS is not directly compatible with standard 4–20 mA loops. Its output is a 1 µA/K current source, not a programmable 4–20 mA transmitter. However, TI provides a reference design (Figure 10) using an op amp and precision resistors to convert TMP17FS output into a calibrated 4–20 mA signal spanning user-defined temperature ranges (e.g., 17°C to 33°C), provided external active circuitry is added.