LM89-1DIMMX/NOPB Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments LM89-1DIMMX/NOPB is a digital temperature sensor with 2-wire SMBus interface offering ±3°C maximum accuracy in an 8-pin VSSOP package. It provides 8-bit resolution and is surface-mount compatible measuring 3×3×1.1 mm. Available from stock worldwide with RoHS-compliant lead-free packaging.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LM89-1DIMMX/NOPB Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.1500(MOQ 500)
- Temp Range
- ?°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 2-wire SMBus serial interface for easy daisy-chaining and compatibility with system management bus controllers
- ±3°C maximum accuracy over temperature range for reliable thermal monitoring in server and embedded systems
- 8-bit resolution digital output eliminates external ADC and calibration components
- Compact 8-pin VSSOP package body 3 mm × 3 mm × 1.1 mm fits dense PCB layouts
- RoHS-compliant lead-free construction with surface-mount assembly for automated production
Applications
The LM89-1DIMMX/NOPB is designed for system-level temperature monitoring in servers, desktop PCs, and workstations where SMBus-compatible thermal management controllers read junction and ambient temperatures to control fan speed and prevent thermal throttling. Its compact VSSOP-8 footprint makes it suitable for placement near hot components such as voltage regulators and processor sockets on dense motherboards. The part also fits industrial control panels and networking equipment requiring continuous ambient temperature logging over a 2-wire bus.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Accuracy-Max (Cel) | 3Cel |
| Body Breadth | 3mm |
| Body Height | 1.1mm |
| Body Length or Diameter | 3mm |
| Housing | PLASTIC |
| JESD-609 Code | e3 |
| Mounting Feature | SURFACE MOUNT |
| Number of Bits | 8 |
| Operating Current-Max | 1.7mA |
| Output Interface Type | 2-WIRE INTERFACE |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape/Style | SQUARE |
| Sensors/Transducers Type | TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL |
| Supply Voltage-Max | 3.6V |
| Supply Voltage-Min | 3V |
| 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 | 8542.39.00.90 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How accurate is LM89-1DIMMX/NOPB and what resolution does it provide for thermal monitoring?
The LM89-1DIMMX/NOPB achieves ±3°C maximum accuracy with 8-bit resolution, corresponding to a temperature step of 1°C per LSB. This accuracy level is sufficient for system thermal protection in servers and embedded systems, where ±3°C is within the hysteresis bands of most fan-control algorithms and thermal shutdown thresholds set at ±5°C margins.
What is the SMBus interface protocol used by LM89-1DIMMX/NOPB, and how many devices can share a bus?
The LM89-1DIMMX/NOPB uses 2-wire SMBus (compatible with I2C) at speeds up to 400 kHz. The device has a configurable I2C address, typically allowing 4 to 8 LM89 sensors on a single bus depending on address pin configuration. This enables monitoring multiple thermal zones — CPU, VRM, memory, and ambient — with a single SMBus controller port and only 2 signal traces.
How does the 3 mm × 3 mm VSSOP-8 package of LM89-1DIMMX/NOPB compare to a TO-92 analog sensor in board area?
The LM89-1DIMMX/NOPB VSSOP-8 footprint occupies approximately 9 mm² of PCB area, compared to roughly 30 mm² for a typical TO-92 through-hole package. Beyond area savings, the VSSOP-8 surface-mount package is compatible with automated pick-and-place assembly, reducing per-unit labour cost in volume production by eliminating manual through-hole insertion.
Can LM89-1DIMMX/NOPB measure both local and remote junction temperatures simultaneously?
The LM89 series is designed to measure both the local ambient temperature and a remote diode-connected transistor junction temperature, making it capable of monitoring a CPU or GPU die directly. The remote sensing channel can resolve temperatures with ±3°C accuracy using a 2-wire connection to the device's remote diode inputs, covering a temperature range typically spanning -40°C to 120°C for the remote junction.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 500+ | $1.3000 | $650.00 |
| 1000+ | $1.2200 | $1220.00 |
| 10000+ | $1.1500 | $11500.00 |
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