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Microchip Technology MCP9843T-BE/MC
- Part No.:
- MCP9843T-BE/MC
- Manufacturer:
- Microchip Technology
- Category:
- Thermal Management
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP9843T-BE/MC.pdf
- Description:
- IC TEMP SENSOR DGTL 8-DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP9843T-BE/MC from Microchip Technology is a JEDEC JC42.4-TSE3000B3-compliant digital temperature sensor with ±0.2°C typical accuracy from +75°C to +95°C, 2-wire I²C/SMBus interface, and user-programmable event boundaries for thermal monitoring in memory modules. It operates from 2.7V to 5.5V, draws 200 µA typical supply current, and delivers 0.25°C resolution temperature readings across –40°C to +125°C.
For engineers reviewing the MCP9843T-BE/MC datasheet, MCP9843T-BE/MC pinout, MCP9843T-BE/MC application, or MCP9843T-BE/MC equivalent, this page provides verified package mapping (DFN-8), confirmed pin functions (A0–A2, SDA, SCL, Event, VDD, GND), JEDEC compliance status, thermal accuracy bands, shutdown behavior, and I²C timing limits - all validated against DS22153C.
Technical Context
The MCP9843T-BE/MC integrates a band-gap temperature sensor and delta-sigma ADC to deliver calibrated digital output via an I²C-compatible 2-wire interface supporting up to 400 kHz bus frequency. Its register-based architecture enables programmable upper/lower/critical trip thresholds, hysteresis, shutdown mode, and event polarity configuration.
Unlike the EEPROM-equipped MCP98243, the MCP9843T-BE/MC omits serial EEPROM and permanent write protection features. It retains full compatibility with the JC42.4-TSE3000B3 DIMM thermal sensor specification, including identical address mapping (0x18–0x1F), event output behavior, and thermal response characteristics in DFN-8 packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy (Grade B) | ±0.2°C typ. / ±1.0°C max. over +75°C to +95°C - meets JEDEC TSE3000B3 requirement for DIMM thermal monitoring |
| Supply Voltage Range | 2.7V to 5.5V - supports wide-system rail compatibility; specified operation at 3.0V–3.6V per JC42.4 |
| Interface | I²C/SMBus, 400 kHz max - enables high-speed polling on dense DIMM buses with up to 8 devices per bus |
| Resolution | 0.25°C - selectable via register; enables precise boundary detection for thermal throttling or alarm triggering |
| Event Output | Open-drain, programmable polarity - allows direct connection to microcontroller interrupt pins or comparator inputs without level-shifting |
| Shutdown Current | 1 µA typ. - reduces system power during idle periods while preserving register state and enabling wake-on-event |
| Package | DFN-8 (2×3 mm, exposed thermal pad) - optimized for low-profile DIMM placement and thermal coupling to PCB |
Pinout & Package
Package: 8-pin DFN (2 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad (EP) internally connected to GND for enhanced thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Slave address LSB / VHV input | Configures device I²C address bit 0; accepts 7–12 V for software write protect (not used in MCP9843T-BE/MC) |
| A1 | Slave address bit 1 | Connects to VDD or GND to set I²C address (0x18–0x1F); internal pull-down ensures default logic 0 |
| A2 | Slave address bit 2 | Connects to VDD or GND to set I²C address (0x18–0x1F); internal pull-down ensures default logic 0 |
| GND | Ground reference | System ground return path; EP pad must be soldered to same net for thermal performance |
| SDA | Bidirectional I²C data line | Requires external pull-up resistor; supports standard/fast-mode I²C with 50 ns spike suppression |
| SCL | I²C clock input | Driven by host controller; timeout window of 25–35 ms prevents bus lockup on clock stretching failure |
| Event | Open-drain temperature alert | Asserts when TA exceeds programmed boundaries; polarity and latch behavior configurable via registers |
| VDD | Power supply input | Accepts 2.7–5.5 V; POR threshold at 2.2 V ensures reliable initialization across voltage rails |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC JC42.4 Compliance | Fully implements TSE3000B3 DIMM thermal sensor spec - guarantees interoperability with DDR3/DDR4 SPD systems |
| User-Programmable Trip Points | Independent upper, lower, and critical temperature thresholds stored in nonvolatile registers - enables adaptive thermal management |
| Configurable Event Polarity & Latching | Active-high/low selection and interrupt/comparator modes - eliminates need for external logic in host MCU designs |
| Low-Power Shutdown Mode | 1 µA typical current draw with register retention - extends battery life in portable memory diagnostics tools |
| Thermal Response Time | 0.7 s (63% step, air-to-oil) in DFN-8 - enables rapid detection of DIMM hotspots during stress testing |
Applications
| Server DIMM Thermal Monitoring | Laptop Memory Module Calibration |
|---|---|
|
Use Scenario: Real-time temperature tracking of DDR4 DIMMs in 1U rack servers under sustained CPU load. IC Role / Device Role / Timing Role: Primary JEDEC-compliant thermal sensor reporting ambient module temperature to BMC via SMBus. Use Value: Enables dynamic memory refresh rate adjustment and early thermal throttling before DRAM error rates increase. |
Use Scenario: Embedded calibration of memory subsystem during laptop BIOS POST sequence. IC Role / Device Role / Timing Role: Standalone temperature reference for SPD EEPROM validation and thermal derating lookup tables. Use Value: Reduces post-boot thermal drift errors by 0.25°C resolution matching JEDEC TSE3000B3 test conditions. |
| Industrial PC Memory Health Diagnostics | Network Switch Line Card Thermal Guarding |
|
Use Scenario: Continuous logging of memory temperature in fanless industrial PCs operating at 70°C ambient. IC Role / Device Role / Timing Role: Low-power shutdown-capable sensor feeding thermal history to Linux thermal daemon. Use Value: 1 µA shutdown current extends runtime during extended idle periods without compromising alarm responsiveness. |
Use Scenario: Per-module thermal supervision on multi-DIMM line cards in carrier-grade Ethernet switches. IC Role / Device Role / Timing Role: Event-output-driven interrupt source for FPGA-based thermal manager with <100 ms latency. Use Value: Open-drain Event pin directly interfaces with 3.3V FPGA GPIO, eliminating level-shifter components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STS40D-DS3F | ±0.1°C max. accuracy over 0°C–100°C; no JEDEC JC42.4 compliance; I²C only (no SMBus timeout) | Targeted at precision environmental sensing, not DIMM SPD systems; lacks event latching and critical trip register | Select if absolute accuracy > JEDEC compliance; avoid for DDR memory modules requiring TSE3000B3 conformance |
| MCP98243T-E/MS | Includes 2 Kbit EEPROM with permanent/software write protection; identical temperature sensor core and pinout | Required for full SPD implementation where vendor ID, DRAM timing, and revision data must be stored on-module | Choose when EEPROM storage for SPD data is mandatory; otherwise MCP9843T-BE/MC reduces cost and complexity |
Compared with STS40D-DS3F, MCP9843T-BE/MC delivers JEDEC-mandated DIMM thermal behavior and robust SMBus timeout handling; compared with MCP98243T-E/MS, it removes redundant EEPROM to lower BOM cost and simplify firmware while retaining full thermal monitoring functionality.
Availability
MCP9843T-BE/MC is available at Aetrix Electronics and suitable for server DIMM thermal monitoring, laptop memory calibration, and industrial PC memory health diagnostics requiring stable component supply and JEDEC-compliant performance.
Supply support for MCP9843T-BE/MC 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, and interface ICs, with deep expertise in embedded control and sensor solutions for computing, communications, and industrial markets.
The MCP9843T-BE/MC belongs to Microchip's JEDEC-compliant memory module thermal sensor family, designed specifically to meet TSE3000B3 requirements for DDR3/DDR4 DIMMs with minimal footprint and power consumption.
FAQ
What is the maximum I²C bus frequency supported by the MCP9843T-BE/MC?
The MCP9843T-BE/MC supports up to 400 kHz I²C bus frequency in fast-mode operation, as confirmed in DS22153C-page 5. This enables efficient polling of multiple sensors on dense DIMM buses without timing violations. The device does not stretch SCL, so host controllers must meet tSU:DI ≥ 100 ns and tHD:DO ≤ 900 ns under 3.0–3.6 V operation. MCP9843T-BE/MC maintains full compatibility with SMBus 2.0 timing constraints.
Does the MCP9843T-BE/MC include EEPROM memory like the MCP98243?
No, the MCP9843T-BE/MC does not include EEPROM. It is the temperature-sensor-only variant of the family, whereas the MCP98243 integrates 2 Kbit serial EEPROM for SPD data storage. DS22153C clearly distinguishes the two parts: MCP9843 meets JC42.4-TSE3000B3, while MCP98243 meets JC42.4-TSE2002B3 and adds EEPROM features. MCP9843T-BE/MC shares identical pinout, accuracy, and register map except for EEPROM-related registers and address bits.
What is the thermal response time of the MCP9843T-BE/MC in its DFN-8 package?
The MCP9843T-BE/MC in DFN-8 achieves a thermal response time of 0.7 seconds to 63% of a step change (air-to-oil bath, +25°C to +125°C), as specified in DS22153C-page 3. This value reflects the combined thermal mass and conductivity of the 2×3 mm DFN package with exposed pad. It enables timely detection of localized DIMM heating during burst workloads, outperforming TSSOP-8 variants (1.4 s) in compact memory layouts.
How does the Event output behave during shutdown mode on the MCP9843T-BE/MC?
In shutdown mode, the MCP9843T-BE/MC de-asserts the Event output signal, as documented in the MCP98243 vs. MCP98242 comparison table (DS22153C-page 2). This behavior differs from the MCP98242, which holds its prior state. The Event pin returns to high-impedance (open-drain off) upon entry to shutdown, ensuring no spurious interrupts during low-power states. MCP9843T-BE/MC resumes normal event generation immediately after exit from shutdown.
What are the valid I²C slave addresses for the MCP9843T-BE/MC?
The MCP9843T-BE/MC supports seven I²C slave addresses: 0x18 through 0x1F (binary 0011xxx), determined by the logic states of A0, A1, and A2 pins. All three address pins have internal pull-down resistors, so unconnected pins default to '0', yielding base address 0x18. DS22153C-page 12 confirms this mapping and notes that the upper four bits (A6–A3) are fixed at '0011' for the temperature sensor function. MCP9843T-BE/MC does not share addresses with its EEPROM-equipped sibling.
MCP9843T-BE/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Temp Monitoring System (Sensor)
- 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:
- No
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
MCP9843T-BE/MC FAQ
1.How can I place an order for MCP9843T-BE/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP9843T-BE/MC 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 MCP9843T-BE/MC reliable?
The price and inventory of MCP9843T-BE/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP9843T-BE/MC is usually 5 days.
3.What payment methods are accepted for MCP9843T-BE/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP9843T-BE/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP9843T-BE/MC?
MCP9843T-BE/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP9843T-BE/MC 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 MCP9843T-BE/MC?
For technical support, including MCP9843T-BE/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP9843T-BE/MC requirements.
6.How does Aetrix verify that MCP9843T-BE/MC is sourced from the original manufacturer or authorized distributors?
All MCP9843T-BE/MC 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 MCP9843T-BE/MC meets industry standards.
7.What is the process for return or replacement of MCP9843T-BE/MC?
All MCP9843T-BE/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP9843T-BE/MC, 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 MCP9843T-BE/MC part is unused and in its original packaging.
Return procedure for MCP9843T-BE/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP9843T-BE/MC Tags
-
EMC2101-ACZL-TR
Microchip Technology
-
MCP9844T-BE/MNY
Microchip Technology
-
EMC2101-R-ACZL-TR
Microchip Technology
-
MCP98244T-BE/MNY
Microchip Technology
-
TC670ECHTR
Microchip Technology
-
SE98ATP,547
NXP Semiconductors
-
AMC6821SDBQR
Texas Instruments
-
MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
-
ADT7475ARQZ-REEL
onsemi
-
MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
-
MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
-
MAX6639AEE+
Analog Devices Inc./Maxim Integrated
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