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Texas Instruments LM45BIM3X/NOPB
- Part No.:
- LM45BIM3X/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM45BIM3X/NOPB.pdf
- Description:
- SENSOR ANALOG -20C-100C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,965
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Product details
Overview
LM45BIM3X/NOPB from Texas Instruments is a precision analog centigrade temperature sensor in SOT-23 package, delivering linear 10.0 mV/°C output voltage with ±3°C accuracy over −20°C to +100°C, <120 μA quiescent current, and 20 Ω output impedance - used for direct analog temperature monitoring in battery-powered medical instruments and HVAC control circuits.
For engineers reviewing the LM45BIM3X/NOPB datasheet, LM45BIM3X/NOPB pinout, LM45BIM3X/NOPB application, or LM45BIM3X/NOPB equivalent, key selection criteria include guaranteed full-range accuracy, low self-heating (0.20°C), wafer-level trimming for cost efficiency, and compatibility with single-supply operation from 4.0 V to 10 V.
Technical Context
The LM45BIM3X/NOPB implements a monolithic silicon bandgap-based sensing element with on-chip amplification and calibration, producing a ratiometric voltage output directly proportional to absolute temperature in degrees Celsius. Its architecture avoids external components for basic operation and supports both two-wire (supply + output) and three-wire configurations depending on grounding strategy.
It operates without external trimming across its rated range, leveraging wafer-level laser trimming to achieve ±3°C total error at −20°C to +100°C and ±2°C at 25°C. Thermal resistance is 260°C/W (junction-to-ambient, PCB-mounted), and nonlinearity is limited to ±0.8°C max over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Scale Factor | +10.0 mV/°C nominal; enables direct analog-to-voltage conversion without scaling resistors in most microcontroller ADC interfaces. |
| Accuracy | ±3°C over −20°C to +100°C; specified and tested across full operating range, not just at 25°C. |
| Supply Voltage Range | +4.0 V to +10 V; supports common logic rails (5 V, 9 V) and eliminates need for dedicated low-noise LDO in many systems. |
| Quiescent Current | ≤120 μA at +25°C; allows multi-year operation from coin-cell batteries in portable medical or environmental monitors. |
| Output Impedance | 20 Ω at 1 mA load; drives standard 10 kΩ input impedance ADCs or op-amp buffers without signal degradation. |
| Self-Heating Error | 0.20°C in still air; ensures minimal measurement offset when mounted on thermally isolated PCB traces or small heatsinks. |
| Nonlinearity | ±0.8°C max over full temperature range; simplifies software compensation requirements in embedded firmware. |
Pinout & Package
SOT-23 (DBZ0003A) package: 3-pin surface-mount, 1.12 mm maximum height, JEDEC TO-236 compliant, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference and thermal sink | Die backside bonded to this pin; provides primary thermal path to PCB ground plane for accurate surface temperature measurement. |
| 2 (VOUT) | Analog output | Linear voltage output referenced to GND; requires no pull-up/pull-down; compatible with rail-to-rail input op-amps and SAR ADCs. |
| 3 (VS) | Positive supply | Accepts 4.0–10 V DC; reverse-polarity protected only by external circuitry; must be bypassed with ≥0.1 μF ceramic capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Calibrated in °C | No software or hardware offset/scale correction needed for centigrade readout - reduces BOM and firmware complexity. |
| Low power consumption | 120 μA max draw enables integration into always-on IoT edge nodes without compromising battery life. |
| Wafer-level trimming | Eliminates post-packaging calibration steps, lowering manufacturing cost and improving unit-to-unit consistency. |
| Low output impedance | 20 Ω drive capability minimizes noise pickup and voltage drop over PCB traces up to 10 cm in length. |
| Full-range specification | ±3°C accuracy guaranteed from −20°C to +100°C - validated per TI's AOQL testing, not extrapolated. |
Applications
| Portable Medical Instruments | Battery Management Systems |
|---|---|
|
Use Scenario: Monitoring patient skin or ambient temperature in handheld pulse oximeters and digital thermometers. IC Role / Device Role / Timing Role: Analog temperature transducer providing calibrated voltage output directly to MCU ADC. Use Value: ±3°C accuracy over −20°C to +100°C ensures clinical-grade reliability without external calibration; 120 μA current enables >2-year battery life on CR2032. |
Use Scenario: Measuring cell pack temperature during charging/discharging in Li-ion battery packs for laptops and power tools. IC Role / Device Role / Timing Role: Primary temperature sensing element feeding thermal protection logic in battery fuel gauges or charge controllers. Use Value: Low self-heating (0.20°C) prevents false overtemperature shutdowns during high-current events; SOT-23 footprint saves space on compact battery PCBs. |
| HVAC Control Units | Printers and FAX Machines |
|
Use Scenario: Room air and heat-exchanger surface temperature sensing in residential thermostats and duct-mounted controllers. IC Role / Device Role / Timing Role: Centigrade sensor interfaced to HVAC microcontroller via analog input for PID loop feedback. Use Value: Linear 10 mV/°C output simplifies firmware math; −20°C to +100°C rating covers indoor/outdoor and equipment hot-spot ranges. |
Use Scenario: Monitoring fuser roller and paper path temperature in laser printers and thermal FAX machines to prevent jams and toner defects. IC Role / Device Role / Timing Role: Direct-mount temperature monitor on heated rollers or near thermal sensors in print engine assemblies. Use Value: GND pin serves as thermal conduction path - mounting die-side-down onto metal rollers yields <0.3°C thermal lag; RoHS-compliant (NOPB) meets global compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog centigrade temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM35DMX/NOPB | Wider operating range (−55°C to +150°C); ±0.5°C typical accuracy at 25°C but ±2°C max over full range; same SOT-23-3 package and pinout. | Preferred where extended low-temp operation or tighter room-temperature accuracy is required; higher quiescent current (50 μA higher). | Select LM35DMX/NOPB if system requires operation below −20°C or improved 25°C accuracy; verify thermal design for higher self-heating. |
| TSIC506-200 | Digital I²C output; ±0.5°C accuracy; integrated 12-bit ADC; 3.3 V only; different 4-pin SMD package (SOT-23-4 variant). | Used where digital interface, lower system noise immunity, or multi-sensor daisy-chaining is needed - not pin-compatible. | Choose TSIC506-200 for systems requiring digital output, reduced analog routing, or higher resolution; requires firmware I²C stack and level-shifting for 5 V systems. |
Compared with LM45BIM3X/NOPB, LM35DMX/NOPB offers broader temperature coverage and marginally better accuracy at room temperature but draws more current and lacks the LM45's wafer-trimmed cost advantage; TSIC506-200 replaces analog output with digital I²C, eliminating ADC resource usage but requiring layout and firmware changes.
Availability
LM45BIM3X/NOPB is available at Aetrix Electronics and suitable for battery management, portable medical instruments, and HVAC control applications requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for LM45BIM3X/NOPB 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
Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability ICs for industrial, automotive, and consumer markets.
The LM45 series was designed as a low-cost, high-accuracy analog temperature sensor family for direct centigrade readout in space-constrained, battery-sensitive applications - emphasizing wafer-level calibration and minimal external component count.
FAQ
What is the operating temperature range of the LM45BIM3X/NOPB?
The LM45BIM3X/NOPB is rated for full operation from −20°C to +100°C, with guaranteed ±3°C accuracy across that entire range. Its operating junction temperature extends to −40°C to +125°C, though accuracy specifications apply only within the −20°C to +100°C range per the datasheet's Operating Ratings table. This makes LM45BIM3X/NOPB suitable for indoor industrial and consumer environments but not for extended automotive under-hood use.
Does the LM45BIM3X/NOPB require external calibration or trimming?
No, the LM45BIM3X/NOPB does not require external calibration or trimming. It is factory-calibrated using wafer-level laser trimming to deliver ±3°C accuracy over −20°C to +100°C and ±2°C at 25°C. All necessary scaling and offset corrections are implemented internally, enabling direct connection to an ADC without additional passive components for basic operation.
What is the supply voltage range for reliable operation of the LM45BIM3X/NOPB?
The LM45BIM3X/NOPB operates reliably from +4.0 V to +10 V DC. Operation below 4.0 V may cause output saturation or loss of linearity; above 10 V risks exceeding absolute maximum ratings. A 0.1 μF ceramic bypass capacitor placed close to the VS pin is recommended to suppress supply noise and ensure stable output, especially in noisy switching environments.
How does self-heating affect measurement accuracy in the LM45BIM3X/NOPB?
The LM45BIM3X/NOPB exhibits less than 0.20°C self-heating in still air due to its ultra-low 120 μA quiescent current and optimized thermal design. When mounted on a standard 2 oz. copper PCB per Figure 15 in the datasheet, self-heating remains negligible for most applications. However, in thermally isolated locations or high-ambient conditions, self-heating may contribute up to 0.25°C error - a factor accounted for in the ±3°C total accuracy spec.
Is the LM45BIM3X/NOPB pin-compatible with other SOT-23 temperature sensors like the LM35?
Yes, the LM45BIM3X/NOPB shares identical SOT-23 (DBZ) pinout with the LM35 series: Pin 1 = GND, Pin 2 = VOUT, Pin 3 = VS. However, while pinout matches, LM45BIM3X/NOPB has different scale factor (10 mV/°C vs. 10 mV/°C for LM35), accuracy profile (±3°C full-range vs. ±2°C full-range for LM35C), and supply range (4–10 V vs. 4–30 V). Electrical substitution requires validation of system-level accuracy and supply constraints.
LM45BIM3X/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Sensor Type:
- Analog, Local
- Sensing Temperature - Local:
- -20°C ~ 100°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 4V ~ 10V
- Resolution:
- 10mV/°C
- Features:
- -
- Accuracy - Highest (Lowest):
- ±2°C (±3°C)
- Test Condition:
- 25°C (-20°C ~ 100°C)
- Operating Temperature:
- -20°C ~ 100°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-3
LM45BIM3X/NOPB FAQ
1.How can I place an order for LM45BIM3X/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM45BIM3X/NOPB 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 LM45BIM3X/NOPB reliable?
The price and inventory of LM45BIM3X/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM45BIM3X/NOPB is usually 5 days.
3.What payment methods are accepted for LM45BIM3X/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM45BIM3X/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM45BIM3X/NOPB?
LM45BIM3X/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM45BIM3X/NOPB 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 LM45BIM3X/NOPB?
For technical support, including LM45BIM3X/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM45BIM3X/NOPB requirements.
6.How does Aetrix verify that LM45BIM3X/NOPB is sourced from the original manufacturer or authorized distributors?
All LM45BIM3X/NOPB 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 LM45BIM3X/NOPB meets industry standards.
7.What is the process for return or replacement of LM45BIM3X/NOPB?
All LM45BIM3X/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM45BIM3X/NOPB, 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 LM45BIM3X/NOPB part is unused and in its original packaging.
Return procedure for LM45BIM3X/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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