Analog Devices Inc. TMP04FRU-REEL7

Overview

TMP04FRU-REEL7 from Analog Devices is a monolithic CMOS/TTL-compatible serial digital output temperature sensor in SO-8 package, delivering ratiometric pulse-width modulated output with ±1.5°C typical accuracy from –25°C to +100°C, 4.5 V to 7 V supply operation, and 0.9–1.3 mA supply current - used for thermal monitoring in computer systems and industrial process control.

For engineers reviewing the TMP04FRU-REEL7 datasheet, TMP04FRU-REEL7 pinout, TMP04FRU-REEL7 application, or TMP04FRU-REEL7 equivalent, key selection considerations include its CMOS/TTL output drive capability (VOH ≥ V+ – 0.4 V, VOL ≤ 0.4 V at 800 µA), 10 ms nominal T1 pulsewidth, 58.8% nominal mark-space ratio at 0°C, and compatibility with microcontroller timer/counter interfaces for centigrade or Fahrenheit decoding.

Technical Context

The TMP04FRU-REEL7 implements a first-order sigma-delta modulator with onboard VPTAT sensor and internal voltage reference, generating a ratiometric digital output where temperature is calculated as 235 − 400 × (T1/T2) °C. Its encoding eliminates clock drift dependency by relying on time-ratio measurement rather than absolute frequency.

This architecture uses oversampling and a high-accuracy comparator to achieve 12-bit effective resolution without external calibration. The CMOS/TTL totem-pole output ensures matched rise/fall times (110.6 ns/127.6 ns at 25°C, unloaded), minimizing pulse-width distortion under capacitive load.

Key Specifications

Pinout & Package

Package: SO-8 (R-8), surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar temperature-to-digital conversion applications.

Compared with LM75BIMM/NOPB and ADT7310TRZ-REEL7, TMP04FRU-REEL7 uniquely delivers ratiometric pulse-width output that eliminates host clock dependency, enabling accurate temperature reading with minimal MCU resources - ideal for legacy or ultra-low-cost controllers lacking I²C/SPI peripherals.

Availability

TMP04FRU-REEL7 is available at Aetrix Electronics and suitable for computer thermal monitoring, industrial process control, and thermal protection requiring stable component supply across extended production lifecycles.

Supply support for TMP04FRU-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The TMP03/TMP04 product line was designed specifically for low-cost, single-pin digital temperature sensing in resource-constrained systems - emphasizing ratiometric accuracy, minimal external components, and direct microcontroller timer compatibility.

FAQ

What is the output format of the TMP04FRU-REEL7 and how is temperature calculated?

The TMP04FRU-REEL7 outputs a ratiometric pulse-width modulated signal with nominal T1 = 10 ms and T2 varying inversely with temperature. Temperature in °C is calculated as 235 − 400 × (T1/T2), where T1 is the high-time and T2 is the low-time of the output waveform. This ratiometric method makes the result independent of both the TMP04FRU-REEL7's internal clock drift and the host microcontroller's timing reference, ensuring robustness in variable environments.

Does the TMP04FRU-REEL7 require external components for basic operation?

No, the TMP04FRU-REEL7 operates with only two external components: a 10 µF tantalum capacitor and a 0.1 µF ceramic capacitor across V+ and GND for supply bypassing. Unlike analog sensors, it needs no external resistors, op-amps, or calibration circuitry. Its CMOS/TTL totem-pole output drives microcontroller inputs directly - eliminating pull-up resistors required by open-collector alternatives like the TMP03.

What is the maximum operating temperature and accuracy limit of the TMP04FRU-REEL7?

The TMP04FRU-REEL7 is specified from –40°C to +100°C with ±1.5°C typical accuracy between –25°C and +100°C. It remains functional up to +150°C, though accuracy degrades beyond the specified range. At 125°C, self-heating error in SO-8 package is <0.21°C when thermally bonded - making TMP04FRU-REEL7 suitable for under-hood automotive or high-temp industrial monitoring where full spec accuracy is not required.

Can the TMP04FRU-REEL7 interface directly with a 3.3 V microcontroller?

Yes, the TMP04FRU-REEL7's CMOS/TTL output is fully compatible with 3.3 V logic. Its VOH is guaranteed ≥ V+ – 0.4 V and VOL ≤ 0.4 V at 800 µA, meaning with a 5 V supply it delivers >4.6 V high and <0.4 V low - well within 3.3 V logic thresholds. No level shifter is needed, and the matched rise/fall times prevent pulse-width distortion that could affect T1/T2 measurement accuracy.

How does the TMP04FRU-REEL7 differ from the TMP03 in terms of output structure and system integration?

The TMP04FRU-REEL7 uses a CMOS/TTL totem-pole output, while the TMP03 uses an open-collector NPN output requiring an external pull-up resistor. This makes TMP04FRU-REEL7 simpler to integrate - no external resistor needed, matched rise/fall times reduce timing errors, and it drives 3.3 V or 5 V logic directly. The TMP03 is preferred only in isolated applications using optocouplers, where its 5 mA sink capability is advantageous.