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Analog Devices Inc./Maxim Integrated MAX6633MSA+
- Part No.:
- MAX6633MSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6633MSA+.pdf
- Description:
- SENSOR DIGITAL -55C-150C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,454
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Product details
Overview
The MAX6633MSA+ from Maxim Integrated is a 12-bit + sign SMBus/I²C-compatible digital temperature sensor with programmable overtemperature alarm, integrated ADC, and four address pins enabling up to 16 devices on one bus. It delivers ±1°C accuracy from 0°C to +50°C, 0.0625°C resolution, and operates from -55°C to +150°C at +3.0V to +5.5V supply - used in PC thermal management and battery safety monitoring.
For engineers reviewing the MAX6633MSA+ datasheet, MAX6633MSA+ pinout, MAX6633MSA+ application, or MAX6633MSA+ equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives, and supply support for industrial embedded and computing thermal sensing deployments.
Technical Context
The MAX6633MSA+ integrates a bandgap-based PTAT sensor and 12-bit ADC with asynchronous 500ms conversion period, storing results in a read-only two's-complement temperature register (1 LSB = 0.0625°C). Its SMBus/I²C slave interface supports Write Byte, Write Word, Read Byte, and Read Word commands with configurable 7-bit slave address via A0–A3 pins.
It features a shutdown mode reducing supply current to ≤30 µA while retaining last temperature value, and includes a configuration register controlling SMBus timeout disable, fault queue enable, and shutdown bit - but lacks ALERT/OVERT outputs and user-programmable thresholds found in MAX6634/MAX6635 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Range | -55°C to +150°C - supports operation in harsh environments including industrial power supplies and automotive under-hood proximity. |
| Resolution | 0.0625°C (12-bit + sign) - enables precise thermal trending for fan speed control and thermal throttling algorithms. |
| Accuracy | ±1.0°C max (0°C to +50°C) - meets tight calibration requirements for server CPU/GPU thermal monitoring. |
| Supply Voltage | +3.0V to +5.5V - interoperates with both 3.3V and 5V system rails without level-shifting. |
| Conversion Rate | 2.4 Hz max (500ms period) - balances update latency and power consumption in continuous monitoring. |
| Shutdown Current | ≤30 µA at +5.5V - extends battery life in portable systems during idle thermal sampling intervals. |
| Address Pins | 4 pins (A0–A3) - allows 16 unique SMBus addresses per bus, critical for multi-zone thermal mapping in blade servers. |
Pinout & Package
MAX6633MSA+ uses an 8-pin SO (Small Outline) package (package code S8-2), RoHS-compliant, with 170°C/W junction-to-ambient thermal resistance. Pin 1 is SDA (open-drain serial data), Pin 2 is SCL (serial clock input), Pin 4 is GND, Pin 8 is VCC (+3.0V to +5.5V), and Pins 3/5/6/7 are address inputs A3/A2/A1/A0 respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SDA | Open-drain bidirectional serial data line | Requires external pull-up; shares bus with other SMBus/I²C slaves; supports ACK/NACK handshaking. |
| 2 - SCL | Serial clock input | Master-generated clock (10–100 kHz); timing must meet SMBus tSU:DAT ≥ 250 ns and tHD:DAT ≥ 300 ns. |
| 3 - A3 | Address input | Configures MSB of 7-bit slave address; tied to GND or VCC to select one of 16 possible bus addresses. |
| 4 - GND | Ground reference | Must be low-impedance connection; shared return path for VCC bypass capacitor (0.1 µF recommended). |
| 5 - A2 | Address input | Second most significant address bit; determines device address alongside A3, A1, A0 per Table 1. |
| 6 - A1 | Address input | Third address bit; combined with A3/A2/A0, sets full 4-bit address space for multi-device topology. |
| 7 - A0 | Address input | LSB of address configuration; enables unique addressing across up to 16 MAX6633MSA+ units on same bus. |
| 8 - VCC | Power supply input | +3.0V to +5.5V range; requires local 0.1 µF ceramic bypass capacitor to GND for stable ADC and interface operation. |
Key Features
| Feature | Design Value |
|---|---|
| 12-bit + sign temperature register | Two's-complement format with 0.0625°C LSB - enables direct arithmetic in firmware without scaling overhead. |
| Four hardware address pins (A0–A3) | Supports 16 independent SMBus addresses - eliminates software address arbitration in dense thermal sensor arrays. |
| SMBus/I²C-compatible interface | Full protocol compliance (Write/Read Byte/Word) - integrates seamlessly into existing platform management controllers (e.g., BMCs). |
| Shutdown mode with retained temperature | Reduces current to ≤30 µA while preserving last reading - allows wake-on-temperature threshold detection without host polling. |
| Wide operating temperature range | -55°C to +150°C - qualified for use adjacent to power MOSFETs, VRMs, and battery packs where ambient extremes occur. |
Applications
| PC Thermal Monitoring | Battery Pack Safety |
|---|---|
|
Use Scenario: Real-time die temperature tracking of CPU, GPU, and VRM components in desktop and laptop platforms. IC Role / Device Role / Timing Role: SMBus slave sensor providing periodic 0.0625°C-resolution readings to platform controller hub (PCH) or baseboard management controller (BMC). Use Value: Enables dynamic fan speed control and thermal throttling with ±1°C accuracy in 0°C–50°C zone, preventing thermal runaway without oversampling. |
Use Scenario: Continuous temperature supervision of Li-ion battery cells or packs in portable medical devices and power tools. IC Role / Device Role / Timing Role: Standalone thermal monitor interfacing directly to microcontroller I²C port; triggers host alert on out-of-spec conditions. Use Value: Supports fail-safe shutdown initiation when cell temperature exceeds +60°C, leveraging 16-device bus scalability for multi-cell pack monitoring. |
| Industrial Power Supply Sensing | Network Equipment Thermal Management |
|
Use Scenario: Die temperature measurement of high-side MOSFETs and gate drivers in telecom rectifiers and AC/DC PSUs. IC Role / Device Role / Timing Role: Localized thermal sensor mounted near heat-generating components; communicates via isolated SMBus to system supervisor IC. Use Value: Delivers ±2.5°C accuracy up to +125°C, enabling predictive derating before thermal limit violation in 24/7 deployed infrastructure. |
Use Scenario: Multi-zone thermal profiling across line cards, switch fabric, and PHY modules in 1U/2U network switches and routers. IC Role / Device Role / Timing Role: One MAX6633MSA+ per critical IC location; all share single SMBus segment using unique A0–A3 configurations. Use Value: Eliminates need for dedicated analog front-ends or multiplexers - reduces BOM count and layout complexity in space-constrained chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6634MSA+ | Includes dual-mode ALERT output and user-programmable THIGH/TLOW registers; three address pins (A0–A2) support up to 8 devices. | Required where autonomous interrupt-driven thermal alerts or thermostat-style comparator-mode operation is needed. | Select MAX6634MSA+ when system-level response to temperature excursions must occur without host processor intervention. |
| LM75BIMM/NOPB | 9-bit resolution (0.5°C), ±2°C accuracy (0°C–70°C), only two address pins (A0–A1), no shutdown mode, lower max temp (+125°C). | Suitable for cost-sensitive consumer electronics with relaxed accuracy and simpler bus topologies. | Choose LM75BIMM/NOPB only if resolution, accuracy, extended temperature range, and 16-device scalability are not required. |
Compared with MAX6634MSA+, MAX6633MSA+ trades ALERT functionality and programmable thresholds for higher bus density (16 vs. 8 devices) and identical core sensing performance; versus LM75BIMM/NOPB, it delivers 3× finer resolution, tighter accuracy, wider temperature range, and triple the address flexibility - making it optimal for scalable, precision thermal architectures.
Availability
MAX6633MSA+ is available at Aetrix Electronics and suitable for PC thermal monitoring, battery pack safety, industrial power supply sensing, and network equipment thermal management requiring stable component supply across long-lifecycle deployments.
Supply support for MAX6633MSA+ 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 high-performance analog and mixed-signal ICs for precision sensing, power management, and communication interfaces.
The MAX6633MSA+ belongs to Maxim's precision temperature sensor family engineered for SMBus/I²C-based thermal monitoring in computing, industrial, and communications infrastructure where accuracy, bus scalability, and reliability are critical.
FAQ
What is the temperature resolution and accuracy of the MAX6633MSA+?
The MAX6633MSA+ provides 12-bit + sign temperature data with 0.0625°C resolution (1 LSB). Accuracy is ±1.0°C maximum over 0°C to +50°C, ±1.5°C over -20°C to +85°C, and ±2.5°C over -40°C to +125°C. These values are production-tested and guaranteed per the datasheet's Electrical Characteristics table.
Does the MAX6633MSA+ support programmable temperature alarms?
No, the MAX6633MSA+ does not include programmable temperature alarms or ALERT/OVERT outputs. That functionality is exclusive to the MAX6634MSA+ and MAX6635MSA+ variants. The MAX6633MSA+ provides only raw temperature data via its SMBus/I²C interface and relies on the host system to implement alarm logic.
How many MAX6633MSA+ devices can share the same SMBus/I²C bus?
Up to 16 MAX6633MSA+ devices can operate on a single SMBus/I²C bus. This is enabled by four hardware address pins (A0–A3), each configurable to GND or VCC, yielding 2⁴ = 16 unique 7-bit slave addresses as defined in Table 1 of the datasheet.
What is the function of the shutdown mode in the MAX6633MSA+?
In shutdown mode, the MAX6633MSA+ disables the ADC and internal circuitry except POR and the SMBus/I²C interface, reducing supply current to ≤30 µA. The temperature register retains the last valid conversion result and remains readable - allowing low-power thermal snapshot retrieval without full reactivation.
What package type and footprint does the MAX6633MSA+ use?
The MAX6633MSA+ uses an 8-pin SO (Small Outline) package (S8-2 land pattern, document no. 90-0096), with standard 1.27 mm pitch and RoHS-compliant finish. Its thermal resistance is 170°C/W (junction-to-ambient), and it requires a 0.1 µF ceramic bypass capacitor between VCC and GND per the typical operating circuit.
MAX6633MSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -55°C ~ 150°C
- Sensing Temperature - Remote:
- -
- Output Type:
- I2C/SMBus
- Voltage - Supply:
- 3V ~ 5.5V
- Resolution:
- 12 b
- Features:
- Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1°C (±2.8°C)
- Test Condition:
- 0°C ~ 50°C (150°C)
- Operating Temperature:
- -55°C ~ 150°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
MAX6633MSA+ FAQ
1.How can I place an order for MAX6633MSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6633MSA+ 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 MAX6633MSA+ reliable?
The price and inventory of MAX6633MSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6633MSA+ is usually 5 days.
3.What payment methods are accepted for MAX6633MSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6633MSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6633MSA+?
MAX6633MSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6633MSA+ 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 MAX6633MSA+?
For technical support, including MAX6633MSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6633MSA+ requirements.
6.How does Aetrix verify that MAX6633MSA+ is sourced from the original manufacturer or authorized distributors?
All MAX6633MSA+ 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 MAX6633MSA+ meets industry standards.
7.What is the process for return or replacement of MAX6633MSA+?
All MAX6633MSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6633MSA+, 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 MAX6633MSA+ part is unused and in its original packaging.
Return procedure for MAX6633MSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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