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Microchip Technology MCP98242T-BE/MNY
- Part No.:
- MCP98242T-BE/MNY
- Manufacturer:
- Microchip Technology
- Category:
- Thermal Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
MCP98242T-BE/MNY.pdf
- Description:
- IC MEMORY MOD TEMP SENSOR 8-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,817
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Product details
Overview
MCP98242T-BE/MNY 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/MNY datasheet, MCP98242T-BE/MNY pinout, MCP98242T-BE/MNY application, or MCP98242T-BE/MNY equivalent, this page delivers verified technical context, validated pin functions, JEDEC-aligned accuracy specs, EEPROM write-protection architecture, and DIMM-specific configuration capabilities - all confirmed against DS21996D.
Technical Context
The MCP98242T-BE/MNY integrates a band-gap temperature sensor and ΔΣ ADC with user-programmable registers for boundary-triggered event signaling, supporting 0.25°C resolution (power-up default), ±1°C/±2°C accuracy across +40°C–+125°C, and configurable hysteresis (0°C/1.5°C/3.0°C/6.0°C) to suppress output chatter near trip thresholds.
Its dual-function serial interface handles both temperature register access and EEPROM operations: the sensor uses address byte 0x30–0x37 (A2:A0 configurable), while EEPROM uses 0xA0–0xA7; software write-protection isolates lower 128 bytes (00h–7Fh) as permanent or reversible, leaving upper 128 bytes (80h–FFh) fully writable for general-purpose data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temp Range | −40°C to +125°C operating; −20°C to +125°C specified accuracy range |
| Accuracy | ±0.5°C (typ)/±1°C (max) at +75°C to +95°C - meets JEDEC JC42.4 for memory module thermal sensing |
| Resolution | 0.25°C (default); selectable down to 0.0625°C via resolution register - enables fine-grained thermal event detection |
| Supply Current | 200 µA (typ) active; 3 µA (max) shutdown - supports low-power DIMM thermal polling |
| EEPROM | 256-byte block (256×8); 1M write cycles endurance; permanent/software write-protect on lower 128 bytes |
| I²C/SMBus | 10–100 kHz clock; 40 ms timeout; up to 8 devices per bus - ensures compatibility with standard memory controller buses |
| Event Output | Open-drain, programmable polarity (active-high/low), configurable as comparator, interrupt, or critical-only signal |
Pinout & Package
Package: 8-pin UDFN (2 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad (EP) electrically tied to GND - optimized for DIMM edge-mount thermal coupling and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Slave Address LSB | Configures bit-0 of 7-bit I²C address (0x30–0x37); pulled high/low to set device identity on shared bus |
| A1 | Slave Address MSB | Configures bit-1 of 7-bit I²C address; enables up to 8 MCP98242T-BE/MNY devices on one bus |
| A2 | Slave Address MSB | Configures bit-2 of 7-bit I²C address; required for multi-device DIMM thermal mapping |
| GND | Reference Ground | System return path; EP must be soldered to same net - critical for thermal response and noise immunity |
| SDA | Bidirectional Data Line | I²C/SMBus data channel; requires external pull-up; supports register reads/writes and EEPROM access |
| SCLK | Clock Input | Master-generated timing reference; defines data sampling edges and bus protocol timing windows |
| Event | Open-Drain Alert | Asserts on temperature violation; polarity and function (comparator/interrupt/critical) set via CONFIG register |
| VDD | Power Supply | 3.0V–3.6V only; POR threshold 2.3V (sensor), 1.6V (EEPROM) - prevents spurious operation during power ramp |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC JC42.4 Compliance | Fully satisfies mobile platform memory module thermal sensor requirements - validated accuracy, timing, and interface behavior |
| SPD EEPROM Integration | 256-byte EEPROM with hardware/software write-protection - stores JEDEC SPD data (vendor ID, module config) without external components |
| User-Programmable Trip Limits | TUPPER/TLOWER/TCRIT registers enable custom thermal boundaries - supports DIMM-specific throttling and alert policies |
| Configurable Event Output | Single pin supports thermostat comparator, microprocessor interrupt, or critical-only alarm - reduces system GPIO count |
| Shutdown Mode Control | Bit-controlled shutdown reduces current to ≤3 µA - extends battery life in portable systems with periodic thermal checks |
Applications
| DDR3/DDR4 DIMM Thermal Monitoring | Laptop Memory Module SPD |
|---|---|
Use Scenario: Real-time temperature tracking of DDR3/DDR4 memory modules during high-bandwidth operation to prevent thermal throttling or data corruption. IC Role / Device Role / Timing Role: Primary JEDEC-compliant thermal sensor with integrated SPD EEPROM - provides both ambient temperature readings and vendor-defined memory configuration data. Use Value: Eliminates need for discrete temperature sensor + separate EEPROM; reduces BOM count and PCB footprint while ensuring JEDEC compliance. | Use Scenario: Storing and protecting JEDEC SPD data (manufacturer ID, part number, timing parameters) in laptop SO-DIMMs where space and reliability are critical. IC Role / Device Role / Timing Role: Dual-role IC: temperature sensor for dynamic thermal management and nonvolatile memory for SPD read-only data storage. Use Value: Permanent write-protection on lower 128 bytes prevents accidental SPD corruption during field updates or firmware writes. |
| Server Memory Subsystem Monitoring | Industrial Embedded Memory Modules |
Use Scenario: Multi-channel thermal supervision in enterprise servers with 16+ DIMMs per CPU, requiring coordinated temperature alerts and fault logging. IC Role / Device Role / Timing Role: Slave device on shared I²C bus; uses A2/A1/A0 addressing to uniquely identify each DIMM's thermal status and SPD revision. Use Value: Configurable hysteresis (0–6°C) prevents false alarms during transient thermal excursions in high-density server chassis. | Use Scenario: Harsh-environment memory modules in industrial PCs or telecom equipment requiring extended temperature operation and long-term data retention. IC Role / Device Role / Timing Role: Temperature sensor with −40°C to +125°C operation and EEPROM endurance rated for 1 million cycles - supports 10+ year field life. Use Value: 0.25°C resolution and ±2°C accuracy over full −20°C to +125°C range enables precise thermal margining in uncontrolled ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature-sensing-with-SPD-EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT30TS74-MA8Y | ±0.5°C accuracy over −40°C to +125°C; 128-byte EEPROM; no software write-protect on lower block | Supports broader temp range but lacks JEDEC JC42.4 certification and SPD-specific register map | Choose when JEDEC compliance is not required and simpler EEPROM protection suffices |
| LM75BIMM/NOPB | ±2°C accuracy; no integrated EEPROM; standalone temperature sensor only; 8-pin VSSOP package | Requires external EEPROM for SPD; lacks TUPPER/TLOWER/TCRIT registers and event output configurability | Choose only if SPD functionality is handled separately and ±2°C accuracy is acceptable |
Compared with AT30TS74-MA8Y and LM75BIMM/NOPB, the MCP98242T-BE/MNY uniquely combines JEDEC JC42.4 compliance, SPD-optimized 256-byte EEPROM with dual write-protection modes, and fully programmable thermal event outputs - making it the only drop-in solution for DDR3/DDR4 DIMM thermal + SPD integration.
Availability
MCP98242T-BE/MNY is available at Aetrix Electronics and suitable for DDR3/DDR4 DIMM thermal monitoring, laptop memory SPD storage, and server memory subsystem monitoring requiring stable component supply, JEDEC compliance, and long-term EEPROM data integrity.
Supply support for MCP98242T-BE/MNY 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 infrastructure.
The MCP98242 product line is designed specifically for JEDEC-compliant memory module thermal sensing and Serial Presence Detect (SPD) data storage - targeting DDR3, DDR4, and LPDDR4 DIMM and SO-DIMM applications.
FAQ
What is the primary JEDEC specification met by the MCP98242T-BE/MNY?
The MCP98242T-BE/MNY meets JEDEC Specification JC42.4 for Mobile Platform Memory Module Thermal Sensor Components. This includes verified ±0.5°C typical accuracy from +75°C to +95°C, defined conversion time (65–125 ms), I²C/SMBus timing compliance, and mandatory register structure for TUPPER/TLOWER/TCRIT boundary configuration - all explicitly tested and documented in DS21996D.
How does the MCP98242T-BE/MNY implement write protection for its 256-byte EEPROM?
The MCP98242T-BE/MNY implements dual-mode write protection: the lower 128 bytes (00h–7Fh) support either permanent hardware write-protection (PWP) or software-reversible write-protection (SWP) activated via A0 pin voltage; the upper 128 bytes (80h–FFh) remain fully writable. This architecture ensures SPD-critical data remains immutable while allowing flexible use of general-purpose storage - a key requirement for JEDEC SPD compliance.
Can the MCP98242T-BE/MNY operate outside the 3.0V–3.6V supply range?
No - the MCP98242T-BE/MNY is specified only for 3.0V to 3.6V operation. Absolute maximum VDD is 6.0V, but functional operation outside 3.0V–3.6V violates electrical specifications: POR thresholds differ between sensor (2.3V) and EEPROM (1.6V), and accuracy, current consumption, and timing parameters are guaranteed solely within the 3.0V–3.6V range per DS21996D Section 1.0.
What is the role of the A0, A1, and A2 pins on the MCP98242T-BE/MNY?
The A0, A1, and A2 pins on the MCP98242T-BE/MNY configure the three least-significant bits of the 7-bit I²C slave address (base 0x30), enabling up to eight devices on a single bus. They determine whether the MCP98242T-BE/MNY responds to addresses 0x30–0x37 - essential for multi-DIMM systems where each module requires unique thermal and SPD addressing without bus contention.
Does the MCP98242T-BE/MNY support SMBus Alert Response Protocol (ARP)?
No - the MCP98242T-BE/MNY does not support SMBus Alert Response Protocol (ARP). Its Event pin operates exclusively as an open-drain, user-configurable alert (comparator/interrupt/critical-only) with polarity selection via the CONFIG register. ARP requires dedicated SMBALERT# signaling and slave address arbitration, which is not implemented in the MCP98242T-BE/MNY's interface logic per DS21996D Sections 4.0 and 5.2.3.
MCP98242T-BE/MNY 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/MNY FAQ
1.How can I place an order for MCP98242T-BE/MNY through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP98242T-BE/MNY 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/MNY reliable?
The price and inventory of MCP98242T-BE/MNY 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/MNY is usually 5 days.
3.What payment methods are accepted for MCP98242T-BE/MNY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP98242T-BE/MNY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP98242T-BE/MNY?
MCP98242T-BE/MNY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP98242T-BE/MNY 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/MNY?
For technical support, including MCP98242T-BE/MNY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP98242T-BE/MNY requirements.
6.How does Aetrix verify that MCP98242T-BE/MNY is sourced from the original manufacturer or authorized distributors?
All MCP98242T-BE/MNY 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/MNY meets industry standards.
7.What is the process for return or replacement of MCP98242T-BE/MNY?
All MCP98242T-BE/MNY units undergo pre-shipment inspection (PSI). If there is an issue with MCP98242T-BE/MNY, 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/MNY part is unused and in its original packaging.
Return procedure for MCP98242T-BE/MNY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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