MCP9843-BE/ST Microchip Integrated Circuit (Small Outline Packages) In Stock
Microchip MCP9843-BE/ST is a JEDEC-compliant I2C serial temperature sensor with ±2°C maximum accuracy and B-grade temperature range. The 4.4 × 3 mm TSSOP-8 plastic package provides a compact, digitally readable thermal solution for system thermal management and environmental monitoring.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- MCP9843-BE/ST Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.7270(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- JEDEC-compliant I2C serial interface enabling direct digital temperature readout without external ADC or analog signal conditioning
- ±2°C maximum accuracy (B-grade) meeting JEDEC thermal sensor specifications for DIMM memory module and system board thermal management
- Ultra-compact 4.4 × 3 × 1.2 mm TSSOP-8 plastic body fitting tight board layouts in servers, storage devices, and portable computing platforms
Applications
The MCP9843-BE/ST monitors die and ambient temperature in server memory modules, hard drive enclosures, and portable computing devices that require JEDEC-compatible thermal sensors readable over I2C. Its ±2°C accuracy satisfies system thermal protection thresholds used in CPU and memory thermal throttling algorithms without requiring calibration in the end product. The TSSOP-8 package integrates easily alongside DRAM or Flash memory on densely populated PCBs where space and height are constrained to 1.2 mm.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | TSSOP-8 |
| Factory Lead Time | 6Weeks |
| YTEOL | 9 |
| Accuracy-Max (Cel) | 2Cel |
| Body Breadth | 3mm |
| Body Height | 1.2mm |
| Body Length or Diameter | 4.4mm |
| Housing | PLASTIC |
| JESD-609 Code | e3 |
| Mounting Feature | SURFACE MOUNT |
| Number of Bits | 11 |
| Operating Current-Max | 0.5mA |
| Output Interface Type | 2-WIRE INTERFACE |
| Output Voltage-Min | 0.4V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP8,.25 |
| Package Shape/Style | RECTANGULAR |
| Sensors/Transducers Type | TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 1.8V |
| Surface Mount | YES |
| Terminal Finish | Matte Tin (Sn) |
| Termination Type | SOLDER |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Malaysia, Philippines, Thailand |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the MCP9843-BE/ST ±2°C maximum accuracy meet JEDEC thermal sensor requirements for DDR memory module protection?
JEDEC standards for DRAM thermal sensors specify ±2°C accuracy within the 0°C to 85°C operating range, and the MCP9843-BE/ST B-grade specification meets this requirement exactly. This means a memory module's thermal protection firmware can reliably trigger throttling at a setpoint such as 85°C knowing the sensor reading is never more than 2°C away from actual junction temperature, preventing thermal damage without unnecessary performance reduction.
For a server board thermal management design, how many MCP9843-BE/ST devices can share a single I2C bus?
The MCP9843-BE/ST supports 3 address-select pins, allowing up to 8 devices (2³ = 8 unique 7-bit addresses) to coexist on a single I2C bus pair. A server motherboard can use a single 2-wire I2C bus to read temperature from all 8 memory slot sensors, reducing wiring complexity compared to discrete analog NTC thermistor solutions that would each require separate ADC channels.
What PCB height constraints does the MCP9843-BE/ST 1.2 mm body height satisfy in compact storage device designs?
With a body height of 1.2 mm and overall package dimensions of 4.4 × 3 mm, the MCP9843-BE/ST fits within the 1.5 mm clearance available on standard 2.5-inch hard drive PCBs and M.2 SSD boards. This low-profile form factor allows thermal monitoring without violating mechanical clearance requirements in slim laptop chassis, blade servers, and embedded storage platforms where taller components would cause assembly interference.
When would a designer select the MCP9843-BE/ST over an analog NTC thermistor for thermal protection in a portable device?
A designer should choose the MCP9843-BE/ST when the microcontroller has no spare ADC channels, requires digital accuracy within ±2°C without resistor-divider calibration, or must read temperature over an existing I2C bus shared with other peripherals. The digital I2C output eliminates ADC quantization error and NTC curve linearization firmware, reducing software complexity and development time compared to analog thermistor solutions that need per-unit or per-batch calibration to achieve ±2°C.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.1000 | $1.10 |
| 4+ | $0.8233 | $3.29 |
| 8+ | $0.8114 | $6.49 |
| 16+ | $0.7996 | $12.79 |
| 100+ | $0.7900 | $79.00 |
| 5000+ | $0.7270 | $3635.00 |
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