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Microchip Technology MCP98242T-BE/MNYBAC
- Part No.:
- MCP98242T-BE/MNYBAC
- Manufacturer:
- Microchip Technology
- Category:
- Thermal Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
MCP98242T-BE/MNYBAC.pdf
- Description:
- IC TEMP SENSOR 2WIRE 3V 8-TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,845
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Product details
Overview
MCP98242T-BE/MNYBAC from Microchip Technology is a JEDEC JC42.4-compliant digital temperature sensor with integrated 256-byte serial EEPROM for SPD applications, operating from 3.0V to 3.6V, delivering ±0.5°C typical accuracy from +75°C to +95°C, 200 µA typical operating current, and I²C/SMBus-compatible 2-wire interface - deployed in DDR3/DDR4 DIMM modules for real-time thermal monitoring and vendor data storage.
For engineers reviewing the MCP98242T-BE/MNYBAC datasheet, MCP98242T-BE/MNYBAC pinout, MCP98242T-BE/MNYBAC application, or MCP98242T-BE/MNYBAC equivalent, key selection criteria include SPD EEPROM write-protection architecture (PWP/SWP), programmable event output polarity and mode (comparator/interrupt/critical), thermal accuracy across JEDEC-defined ranges, and compatibility with multi-drop I²C/SMBus buses up to 100 kHz.
Technical Context
The MCP98242T-BE/MNYBAC integrates a bandgap-based temperature sensor with a delta-sigma ADC and user-programmable registers, supporting 0.25°C resolution (power-up default) and configurable hysteresis (0°C/1.5°C/3.0°C/6.0°C) to suppress output chatter near trip thresholds. Its dual-function Event pin operates as open-drain comparator, interrupt, or critical alert output.
It implements separate address spaces for temperature sensor (0011,A2,A1,A0) and EEPROM (1010,xxx) per SMBus protocol, with permanent and reversible software write-protection applied to lower 128 bytes (00h–7Fh); upper 128 bytes (80h–FFh) remain unprotected for general-purpose use. Serial interface timing complies with standard-mode I²C (10–100 kHz) and includes 40 ms timeout reset for SCLK lockup recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temp Accuracy (typ./max) | ±0.5°C / ±1.0°C from +75°C to +95°C - meets JEDEC JC42.4 active-range requirement for memory module thermal management |
| Operating Voltage | 3.0V to 3.6V - optimized for DDR SPD bus voltage, not compatible with 1.8V or 5V systems without level shifting |
| Interface | I²C/SMBus, 10–100 kHz - supports up to eight devices on one bus using A2/A1/A0 address pins |
| EEPROM Size & Protection | 256 bytes (256×8), lower 128 bytes permanently or reversibly write-protected - enables secure storage of JEDEC SPD data and vendor ID |
| Shutdown Current | ≤3 µA max - enables low-power thermal monitoring during system standby without disabling SPD functionality |
| Conversion Time | 65–125 ms - determines minimum polling interval for real-time temperature updates in DIMM thermal control loops |
| Event Output Type | Open-drain, programmable polarity and mode - allows direct connection to microcontroller GPIO or dedicated interrupt lines without external pull-ups |
Pinout & Package
Package: 8-pin TDFN (2 mm × 3 mm, exposed thermal pad). Pin 9 (EP) is internally connected to GND and must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Slave Address LSB | Configures bit-0 of 7-bit I²C address (0011,A2,A1,A0); tied high/low to select among eight device addresses |
| A1 | Slave Address MSB-1 | Configures bit-1 of 7-bit I²C address; enables multi-device addressing on shared SPD bus |
| A2 | Slave Address MSB-2 | Configures bit-2 of 7-bit I²C address; required for DIMM modules with multiple sensors or SPD devices |
| GND | Ground Reference | System return path for sensor, EEPROM, and Event output; EP pin electrically bonded to this node |
| SDA | Bidirectional Data Line | I²C/SMBus data line with 5 pF input capacitance; requires external pull-up to VDD (3.3V) |
| SCLK | Serial Clock Input | Master-generated clock (10–100 kHz); timing-critical for register access and EEPROM writes |
| Event | Open-Drain Alert Output | Asserts when TA exceeds TUPPER/TLOWER/TCRIT; polarity and function (comp/int/crit) configured via CONFIG register |
| VDD | Power Supply | 3.0–3.6V only; POR threshold at 2.3V (sensor) / 1.6V (EEPROM); no operation outside this range |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC JC42.4 Compliance | Fully satisfies Mobile Platform Memory Module Thermal Sensor specification, including accuracy, resolution, and register map requirements |
| SPD EEPROM Architecture | 256-byte EEPROM with hardware-enforced PWP/SWP protection on lower 128 bytes - prevents accidental overwrite of critical SPD data |
| Programmable Event Output | Single pin supports three functional modes (thermostat comparator, microprocessor interrupt, critical shutdown signal) via CONFIG register bits |
| Configurable Temperature Resolution | Selectable 0.0625°C to 0.5°C resolution - balances measurement precision against conversion time (65–125 ms) and power consumption |
| Thermal Hysteresis Control | Four-step hysteresis (0°C/1.5°C/3.0°C/6.0°C) prevents rapid toggling of Event output near boundary thresholds in noisy thermal environments |
Applications
| DDR3/DDR4 DIMM Modules | Laptop & Server Memory Subsystems |
|---|---|
Use Scenario: Real-time thermal monitoring of DRAM chips on UDIMM/RDIMM modules to prevent thermal throttling or data corruption. IC Role / Device Role / Timing Role: JEDEC JC42.4-compliant temperature sensor and SPD EEPROM co-located on memory PCB; provides ambient die temperature and stores JEDEC SPD data. Use Value: Enables host BIOS/system firmware to dynamically adjust memory refresh rates and cooling fan speed based on validated ±0.5°C accuracy in the +75°C to +95°C range. | Use Scenario: Thermal event detection in dual-channel memory controllers where multiple DIMMs require independent temperature boundary alerts. IC Role / Device Role / Timing Role: Slave device on shared I²C/SMBus; uses A2/A1/A0 pins to assign unique addresses for simultaneous polling of up to eight sensors. Use Value: Reduces BOM count by integrating sensor + SPD EEPROM in single 2×3 mm TDFN package, eliminating discrete EEPROM and reducing PCB footprint. |
| Hard Disk Drive Enclosures | Industrial Embedded Memory Modules |
Use Scenario: Monitoring enclosure temperature near SATA/NVMe SSDs to trigger thermal shutdown before NAND flash degradation occurs. IC Role / Device Role / Timing Role: Standalone thermal monitor with programmable TCRIT output; Event pin wired directly to system PMIC or microcontroller reset line. Use Value: Leverages 3 µA shutdown current to maintain thermal vigilance during drive sleep states without draining backup power sources. | Use Scenario: Long-life memory modules used in railway signaling or medical imaging equipment requiring guaranteed SPD data retention over 10-year service life. IC Role / Device Role / Timing Role: EEPROM endurance rated at 1 million write cycles at 5V; lower 128 bytes protected via permanent write-lock to preserve calibration and traceability data. Use Value: Eliminates need for external OTP or FRAM for SPD storage, simplifying qualification and reducing supply chain risk for industrial-grade memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature sensor + SPD EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT30TS74-MA8Y | ±0.5°C accuracy over -20°C to +125°C (full range), 128-byte EEPROM, no TSSOP option, no PWP/SWP split | Designed for broader industrial temp range but lacks JEDEC JC42.4 compliance and SPD-specific register mapping | Select when full-range accuracy is prioritized over JEDEC SPD compatibility and DIMM integration |
| MCP9808-E/MS | Same core sensor IP, 256-byte EEPROM, but no SPD-specific write-protection scheme or JC42.4 register layout | General-purpose thermal monitor; lacks TUPPER/TLOWER/TCRIT trip registers and SPD EEPROM partitioning | Select for non-SPD applications requiring higher resolution (0.0625°C) and faster conversion (250 ms max), not for memory module deployment |
Compared with AT30TS74-MA8Y and MCP9808-E/MS, MCP98242T-BE/MNYBAC uniquely delivers JEDEC JC42.4 compliance, SPD EEPROM with dual-layer write protection, and register-mapped event boundaries - making it the only qualified solution for DDR3/DDR4 DIMM thermal management and SPD data storage.
Availability
MCP98242T-BE/MNYBAC is available at Aetrix Electronics and suitable for DDR3/DDR4 DIMM manufacturing, server memory subsystem design, and industrial embedded memory module production requiring stable component supply and long-term lifecycle support.
Supply support for MCP98242T-BE/MNYBAC 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
Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP98xx family is designed specifically for JEDEC-compliant memory module thermal sensing and SPD data storage, targeting DDR3/DDR4 UDIMM, RDIMM, and LRDIMM applications with integrated accuracy, low power, and robust EEPROM protection.
FAQ
What is the primary application of the MCP98242T-BE/MNYBAC?
The MCP98242T-BE/MNYBAC is primarily used in DDR3 and DDR4 DIMM modules as a JEDEC JC42.4-compliant temperature sensor and Serial Presence Detect (SPD) EEPROM. It monitors memory module temperature with ±0.5°C typical accuracy in the +75°C to +95°C range and stores vendor, timing, and configuration data in its 256-byte EEPROM - enabling BIOS-level thermal management and memory initialization.
Does the MCP98242T-BE/MNYBAC support I²C and SMBus protocols?
Yes, the MCP98242T-BE/MNYBAC supports both I²C and SMBus protocols through its 2-wire SDA/SCL interface, operating at 10–100 kHz. It implements SMBus timeout (40 ms typical), packet error checking (PEC) readiness, and address decoding compliant with standard-mode I²C - allowing seamless integration into existing memory controller buses without protocol translation.
How is write protection implemented in the MCP98242T-BE/MNYBAC EEPROM?
The MCP98242T-BE/MNYBAC EEPROM implements two distinct write-protection schemes: Permanent Write-Protection (PWP) and Software Reversible Write-Protection (SWP) for the lower 128 bytes (00h–7Fh), while the upper 128 bytes (80h–FFh) remain unprotected. Protection is activated by applying 8–12 V to the A0 pin, ensuring JEDEC SPD data integrity without compromising flexibility for field updates.
Can the Event output of the MCP98242T-BE/MNYBAC be configured for different functions?
Yes, the Event output of the MCP98242T-BE/MNYBAC is fully configurable via the Configuration register: it can operate as an active-low or active-high comparator output for thermostat control, a temperature event interrupt for microprocessor systems, or a critical temperature alert. This is achieved by setting Event Sel, Event Pol, and Event Mod bits - all without external components.
What package type is used for the MCP98242T-BE/MNYBAC?
The MCP98242T-BE/MNYBAC uses an 8-pin TDFN package (2 mm × 3 mm) with an exposed thermal pad (EP). The EP is internally connected to GND and must be soldered to the PCB ground plane to ensure proper thermal dissipation and electrical reference stability - critical for maintaining ±0.5°C accuracy in high-density DIMM layouts.
MCP98242T-BE/MNYBAC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Temp Monitoring System (Sensor), DIMM DDR Memory
- Sensor Type:
- Internal
- Sensing Temperature:
- -40°C ~ 125°C
- Accuracy:
- ±3°C(Max)
- Topology:
- ADC (Sigma Delta), Register Bank
- Output Type:
- I2C/SMBus
- Output Alarm:
- Yes
- Output Fan:
- Yes
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x3)
MCP98242T-BE/MNYBAC FAQ
1.How can I place an order for MCP98242T-BE/MNYBAC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP98242T-BE/MNYBAC 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 MCP98242T-BE/MNYBAC reliable?
The price and inventory of MCP98242T-BE/MNYBAC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP98242T-BE/MNYBAC is usually 5 days.
3.What payment methods are accepted for MCP98242T-BE/MNYBAC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP98242T-BE/MNYBAC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP98242T-BE/MNYBAC?
MCP98242T-BE/MNYBAC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP98242T-BE/MNYBAC 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 MCP98242T-BE/MNYBAC?
For technical support, including MCP98242T-BE/MNYBAC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP98242T-BE/MNYBAC requirements.
6.How does Aetrix verify that MCP98242T-BE/MNYBAC is sourced from the original manufacturer or authorized distributors?
All MCP98242T-BE/MNYBAC 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 MCP98242T-BE/MNYBAC meets industry standards.
7.What is the process for return or replacement of MCP98242T-BE/MNYBAC?
All MCP98242T-BE/MNYBAC units undergo pre-shipment inspection (PSI). If there is an issue with MCP98242T-BE/MNYBAC, 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 MCP98242T-BE/MNYBAC part is unused and in its original packaging.
Return procedure for MCP98242T-BE/MNYBAC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP98242T-BE/MNYBAC Tags
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