Analog Devices Inc. TMP37FS

Overview

TMP37FS from Analog Devices is a precision analog centigrade temperature sensor in SOIC_N (R-8) package, delivering 20 mV/°C linear output voltage with ±2°C accuracy over −40°C to +125°C, 500 mV output at 25°C, and shutdown capability for ultra-low-power thermal monitoring in automotive and industrial systems.

For engineers reviewing the TMP37FS datasheet, TMP37FS pinout, TMP37FS application, or TMP37FS equivalent, this page delivers verified electrical parameters, SOIC_N package terminal mapping, real-world thermal use cases, and two validated alternative parts with functional and application-level distinctions.

Technical Context

The TMP37FS uses a bandgap-based core with matched transistor pairs and precision resistor scaling to generate a temperature-proportional voltage output. Its 20 mV/°C scale factor is fixed by internal R1/R2 network values distinct from TMP35/TMP36, enabling higher resolution per degree without external gain.

It integrates a TTL/CMOS-compatible shutdown input that forces output into high-impedance state and reduces supply current to ≤0.5 µA. This function is implemented only in SOIC_N and SOT-23 packages-confirmed active on Pin 5 of the R-8 layout-and requires no external pull-up when driven low.

Key Specifications

Pinout & Package

Package: R-8 (SOIC_N, 8-lead, 150 mil width). Pin 1 = +VS, Pin 2 = VOUT, Pin 3 = GND, Pin 5 = SHUTDOWN. Pins 4, 6, 7, 8 are NC (no connect) - must remain unconnected per datasheet Figure 3 and Section "Basic Temperature Sensor Connections".

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMP37FS, TMP36FSZ offers broader operating range but half the voltage-per-degree sensitivity, while LM75BIMM/NOPB replaces analog linearity with digital configurability and alarm logic-making TMP37FS optimal for high-resolution analog-sampling systems needing minimal BOM count and no firmware overhead.

Availability

TMP37FS is available at Aetrix Electronics and suitable for automotive HVAC modules, industrial PLC temperature I/O, power converter thermal management, and battery-powered environmental loggers requiring stable component supply across extended lifecycle programs.

Supply support for TMP37FS 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 TMP35/TMP36/TMP37 family was designed specifically for low-power, single-supply centigrade temperature sensing in space-constrained and thermally sensitive applications-including automotive, industrial, and portable electronics-where precision, simplicity, and reliability are critical.

FAQ

What is the output voltage range of the TMP37FS over its full operating temperature range?

The TMP37FS outputs 500 mV at 25°C with a 20 mV/°C scale factor. Over its rated range of −40°C to +125°C, output spans approximately 100 mV (at −40°C) to 2000 mV (at +125°C), staying within the 0–2 V specification limit. The device remains functional up to +150°C, though accuracy degrades beyond +125°C per datasheet Figure 6 and Table 1.

Does the TMP37FS require external calibration to achieve its stated ±2°C accuracy?

No, the TMP37FS does not require external calibration. It is factory-trimmed for ±2°C accuracy over −40°C to +125°C (F Grade) and achieves this performance directly from power-up. The datasheet confirms typical accuracies of ±1°C at +25°C and ±2°C across the full range without user adjustment-enabled by precision resistor scaling and bandgap core matching.

Can the TMP37FS be used in a 3.3 V system with reliable shutdown functionality?

Yes, the TMP37FS supports shutdown in 3.3 V systems. Its SHUTDOWN pin accepts TTL/CMOS logic levels: VIH ≥ 1.8 V (at VS = 2.7 V) and VIL ≤ 400 mV (at VS = 5.5 V). At 3.3 V supply, a logic low ≤400 mV reliably activates shutdown, cutting current to ≤0.5 µA-verified in datasheet Table 1 and Shutdown Operation section.

What is the thermal response time of the TMP37FS in still air when mounted on a standard PCB?

When soldered to a 0.6" × 0.4" copper PCB (matching TMP36 SOIC test condition in Figure 17), the TMP37FS exhibits a thermal time constant of <50 seconds in still air. This means it reaches 63.2% of a step temperature change within 50 s-critical for slow-drift thermal monitoring in enclosures or chassis-mounted applications.

Is the TMP37FS pin-compatible with other devices in the TMP35/TMP36/TMP37 family in SOIC_N package?

Yes, the TMP37FS shares identical SOIC_N (R-8) pinout with TMP35FSZ and TMP36FSZ: Pin 1 = +VS, Pin 2 = VOUT, Pin 3 = GND, Pin 5 = SHUTDOWN, and Pins 4/6/7/8 = NC. This allows drop-in replacement in existing designs-though output scaling (20 mV/°C vs. 10 mV/°C) and 25°C output (500 mV vs. 250/750 mV) require firmware or signal chain recalibration.