Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Sensors, Transducers > Temperature Sensors > Analog and Digital Output

Analog Devices Inc./Maxim Integrated DS1631U+T&R

Name: DS1631U+T&R
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1631U+T&R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: DS1631U+T&R

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Analog and Digital Output

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: DS1631U+T&R.pdf

Description:: SENSOR DIGITAL -55C-125C 8UMAX

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:5,235

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

DS1631U+T&R from Maxim Integrated is a high-precision digital thermometer and thermostat IC with 9–12-bit user-selectable resolution, ±0.5°C accuracy from 0°C to +70°C, and operation over -55°C to +125°C. It features nonvolatile TH/TL trip-point registers, push-pull TOUT output, and 2-wire (I²C-compatible) interface - used for thermal monitoring in space-constrained embedded systems such as network routers and cellular base stations.

For engineers reviewing the DS1631U+T&R datasheet, DS1631U+T&R pinout, DS1631U+T&R application, or DS1631U+T&R equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-ready procurement details - all grounded in Maxim's official DS1631/DS1631A/DS1731 datasheet Rev 1 (1/15).

Technical Context

The DS1631U+T&R implements a bandgap-based temperature sensor with delta-sigma ADC, supporting continuous or one-shot conversion modes controlled via its 1-byte configuration register. Its 2-wire serial interface uses open-drain SDA and input-only SCL, with slave address 1001A2A1A0 and support for up to eight devices on one bus.

Thermostat functionality is fully configurable: TH and TL registers are stored in NV EEPROM (50k write cycles, 10-year retention), enabling pre-installation programming; TOUT polarity (active-high/low) and hysteresis are set via POL and R0/R1 bits; temperature high/low flags (THF/TLF) provide latched status reporting independent of microcontroller polling.

Key Specifications

Parameter	Value and Actual Design Meaning
Temperature Range	-55°C to +125°C - supports industrial, telecom, and automotive under-hood ambient conditions without external compensation.
Accuracy	±0.5°C from 0°C to +70°C at 3.0–5.5V - enables precise thermal throttling in CPU/GPU power management subsystems.
Resolution	User-selectable 9–12 bits (0.5°C to 0.0625°C steps) - allows trade-off between conversion time (93.75 ms to 750 ms) and thermal sensitivity.
Interface	2-wire I²C-compatible bus (400 kHz max) - simplifies integration into existing microcontroller-based monitoring systems with minimal GPIO overhead.
Supply Voltage	2.7V to 5.5V - compatible with both 3.3V and 5V logic domains, eliminating level-shifter requirements.
Standby Current	800 nA at 0°C to +70°C - extends battery life in portable thermal sensors and IoT edge nodes.
EEPROM Endurance	50,000 write cycles, 10-year data retention - ensures reliable field updates of thermostat thresholds across product lifetime.

Pinout & Package

DS1631U+T&R is packaged in an 8-pin µSOP (3.0 mm × 3.0 mm, 0.5 mm pitch), optimized for high-density PCB layouts in compact networking and telecom modules.

Pin/Terminal	Circuit Role	Design Meaning
1: SDA	2-wire bidirectional data line	Open-drain I/O requiring external pull-up; supports multidrop addressing and ACK/NACK handshaking per I²C protocol.
2: SCL	2-wire clock input	Input-only; synchronizes all read/write transfers; tolerates 0–400 kHz clock frequency with defined rise/fall timing.
3: TOUT	Thermostat output	Push-pull digital output; asserts active state (configurable polarity) when temperature crosses TH/TL thresholds - drives LEDs, MOSFET gates, or interrupt lines directly.
4: GND	Ground reference	Primary return path for analog sensor core and digital logic; must be low-impedance to maintain ±0.5°C accuracy.
5: A2	Slave address bit	Hardware-configurable MSB of 7-bit I²C address (1001A2A1A0); enables unique addressing of up to eight DS1631U+T&R units on shared bus.
6: A1	Slave address bit	Hardware-configurable middle bit of I²C address; used with A2 and A0 to avoid address collisions in distributed sensing networks.
7: A0	Slave address bit	Hardware-configurable LSB of I²C address; allows plug-and-play expansion without firmware reconfiguration.
8: VDD	Power supply input	Accepts 2.7–5.5V; powers internal bandgap reference, ADC, EEPROM, and I/O buffers - no external regulator needed.

Key Features

Feature	Design Value
Nonvolatile Trip-Point Storage	TH and TL registers retain user-defined thresholds in EEPROM - eliminates boot-time MCU initialization and enables true "set-and-forget" thermostat deployment.
Configurable Conversion Mode	1SHOT bit selects one-shot (single measurement) or continuous mode; DS1631U+T&R defaults to idle - prevents unintended power-on conversions unless explicitly enabled.
Latched Temperature Flags	THF and TLF bits record peak excursion history (≥TH or ≤TL) since power-up - supports diagnostic logging and fault recovery without continuous polling.
Resolution-Scalable Timing	Conversion time scales deterministically (93.75 ms → 750 ms) with resolution (9→12 bits) - enables predictable system-level timing budgets for thermal control loops.
Wide Supply Range Operation	Functional across 2.7–5.5V with stable accuracy - accommodates brown-out conditions and mixed-voltage board designs without recalibration.

Applications

Network Router Thermal Management	Cellular Base Station Power Amplifier Monitoring
Use Scenario: Real-time junction temperature tracking of ASICs and switching regulators in multi-Gbps routing platforms. IC Role / Device Role / Timing Role: Standalone digital thermometer providing calibrated 12-bit readings every 750 ms; TOUT triggers fan speed control or packet throttling upon threshold breach. Use Value: Maintains ±0.5°C accuracy across -40°C to +85°C operating range, preventing thermal runaway while minimizing host MCU intervention.	Use Scenario: Closed-loop thermal protection of GaN RF power amplifiers in 4G/5G macrocells exposed to outdoor ambient swings. IC Role / Device Role / Timing Role: Nonvolatile thermostat with pre-programmed TH/TL thresholds; TOUT drives shutdown circuitry when PA die temperature exceeds safe limits. Use Value: EEPROM-stored trip points survive power cycling, enabling immediate post-power-up protection without firmware handshake delays.
Portable Medical Diagnostic Device	Industrial PLC I/O Module
Use Scenario: Battery-powered handheld ultrasound probe requiring low-quiescent-current thermal validation before scan initiation. IC Role / Device Role / Timing Role: Ultra-low-power temperature monitor (800 nA standby) verifying sensor head integrity prior to high-voltage pulse generation. Use Value: Eliminates need for external supervisor IC - single DS1631U+T&R provides both measurement and fail-safe enable signal via TOUT.	Use Scenario: DIN-rail mounted programmable logic controller monitoring ambient cabinet temperature to prevent processor lockup during summer operation. IC Role / Device Role / Timing Role: Multidrop-capable sensor (8 units on one bus) feeding temperature data to PLC CPU via Modbus RTU gateway. Use Value: Reduces wiring complexity and BOM count - one 2-wire pair replaces eight analog thermistor channels with superior noise immunity and calibration stability.

Network Router Thermal Management

Cellular Base Station Power Amplifier Monitoring

Use Scenario: Real-time junction temperature tracking of ASICs and switching regulators in multi-Gbps routing platforms.

IC Role / Device Role / Timing Role: Standalone digital thermometer providing calibrated 12-bit readings every 750 ms; TOUT triggers fan speed control or packet throttling upon threshold breach.

Use Value: Maintains ±0.5°C accuracy across -40°C to +85°C operating range, preventing thermal runaway while minimizing host MCU intervention.

Use Scenario: Closed-loop thermal protection of GaN RF power amplifiers in 4G/5G macrocells exposed to outdoor ambient swings.

IC Role / Device Role / Timing Role: Nonvolatile thermostat with pre-programmed TH/TL thresholds; TOUT drives shutdown circuitry when PA die temperature exceeds safe limits.

Use Value: EEPROM-stored trip points survive power cycling, enabling immediate post-power-up protection without firmware handshake delays.

Portable Medical Diagnostic Device

Industrial PLC I/O Module

Use Scenario: Battery-powered handheld ultrasound probe requiring low-quiescent-current thermal validation before scan initiation.

IC Role / Device Role / Timing Role: Ultra-low-power temperature monitor (800 nA standby) verifying sensor head integrity prior to high-voltage pulse generation.

Use Value: Eliminates need for external supervisor IC - single DS1631U+T&R provides both measurement and fail-safe enable signal via TOUT.

Use Scenario: DIN-rail mounted programmable logic controller monitoring ambient cabinet temperature to prevent processor lockup during summer operation.

IC Role / Device Role / Timing Role: Multidrop-capable sensor (8 units on one bus) feeding temperature data to PLC CPU via Modbus RTU gateway.

Use Value: Reduces wiring complexity and BOM count - one 2-wire pair replaces eight analog thermistor channels with superior noise immunity and calibration stability.

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital thermometer and thermostat applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS1631AU+T&R	Auto-starts temperature conversions at power-up; identical pinout, specs, and EEPROM features.	Preferred where immediate post-power-on thermostat action is required without MCU command sequence.	Select DS1631AU+T&R if autonomous startup is mandatory; otherwise DS1631U+T&R offers greater control over conversion initiation timing.
LM75BIMM/NOPB	9-bit fixed resolution, ±2°C accuracy over -25°C to +100°C, no NV TH/TL storage, open-drain TOUT only.	Suitable for cost-sensitive consumer electronics where ±0.5°C accuracy and nonvolatile thresholds are not required.	Choose LM75BIMM/NOPB for simpler, lower-cost thermal alerting; DS1631U+T&R is required for precision industrial or telecom use cases demanding traceable calibration and field-programmable hysteresis.

Compared with DS1631AU+T&R, DS1631U+T&R gives full software control over conversion start timing, while LM75BIMM/NOPB lacks EEPROM trip-point storage and sub-degree accuracy - making DS1631U+T&R the only option meeting telecom-grade thermal management requirements with zero MCU dependency for configuration persistence.

Availability

DS1631U+T&R is available at Aetrix Electronics and suitable for network routers and switches, cellular base stations, and portable medical diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DS1631U+T&R 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

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, communications, and computing applications, with emphasis on reliability, low power, and integration.

The DS1631U+T&R belongs to Maxim's high-accuracy digital temperature sensor family, engineered specifically for thermal management in infrastructure equipment where calibration stability, nonvolatile configuration, and wide-temperature operation are critical.

FAQ

What is the operating temperature range of the DS1631U+T&R?

The DS1631U+T&R operates from -55°C to +125°C, with guaranteed ±0.5°C accuracy between 0°C and +70°C at supply voltages from 3.0V to 5.5V. This range supports deployment in harsh environments including outdoor telecom enclosures and industrial control cabinets. The device maintains functional integrity across the full range, though accuracy degrades to ±2°C outside the 0°C to +70°C band.

Does the DS1631U+T&R require external components for basic operation?

No, the DS1631U+T&R requires no external components for core thermometer and thermostat functionality. Only two external pull-up resistors (on SDA and SCL) are needed for I²C communication. Its integrated bandgap sensor, delta-sigma ADC, EEPROM, and push-pull TOUT eliminate the need for external references, op-amps, or discrete logic - reducing BOM count and layout area in space-constrained designs.

How does the DS1631U+T&R store thermostat trip points?

The DS1631U+T&R stores upper (TH) and lower (TL) trip points in on-chip NV EEPROM, rated for 50,000 write cycles and 10 years of data retention at -55°C to +55°C. These registers retain values across power cycles, allowing thresholds to be programmed once during manufacturing or field service - enabling true "set-and-forget" thermal protection without MCU involvement during normal operation.

Can multiple DS1631U+T&R devices share the same I²C bus?

Yes, up to eight DS1631U+T&R devices can operate on a single 2-wire bus using hardware-addressable pins A2, A1, and A0. Each device accepts a unique 7-bit slave address (1001A2A1A0), enabling distributed temperature sensing across PCBs or chassis without bus arbitration or additional controllers - ideal for rack-mounted telecom or server thermal monitoring.

What is the conversion time for 12-bit resolution on the DS1631U+T&R?

At 12-bit resolution, the DS1631U+T&R requires 750 ms per temperature conversion - the maximum time among its four selectable resolutions (9-bit: 93.75 ms, 10-bit: 187.5 ms, 11-bit: 375 ms). This deterministic timing allows precise scheduling of thermal control actions in real-time systems, and the DONE bit in the configuration register signals completion for synchronous polling or interrupt-driven handling.

DS1631U+T&R Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Sensor Type:: Digital, Local

Sensing Temperature - Local:: -55°C ~ 125°C

Sensing Temperature - Remote:: -

Output Type:: I2C

Voltage - Supply:: 2.7V ~ 5.5V

Resolution:: 11 b

Features:: One-Shot, Output Switch, Programmable Limit, Programmable Resolution, Standby Mode

Accuracy - Highest (Lowest):: ±0.5°C (±2°C)

Test Condition:: 0°C ~ 70°C (-55°C ~ 125°C)

Operating Temperature:: -55°C ~ 125°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 8-uMAX/uSOP

DS1631U+T&R FAQ

1.How can I place an order for DS1631U+T&R through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1631U+T&R on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for DS1631U+T&R reliable?

The price and inventory of DS1631U+T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1631U+T&R is usually 5 days.

3.What payment methods are accepted for DS1631U+T&R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1631U+T&R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1631U+T&R?

DS1631U+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1631U+T&R order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for DS1631U+T&R?

For technical support, including DS1631U+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1631U+T&R requirements.

6.How does Aetrix verify that DS1631U+T&R is sourced from the original manufacturer or authorized distributors?

All DS1631U+T&R products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS1631U+T&R meets industry standards.

7.What is the process for return or replacement of DS1631U+T&R?

All DS1631U+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1631U+T&R, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The DS1631U+T&R part is unused and in its original packaging.

Return procedure for DS1631U+T&R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…