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Texas Instruments LM50BIM3
- Part No.:
- LM50BIM3
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM50BIM3.pdf
- Description:
- SENSOR ANALOG -25C-100C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,671
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Product details
Overview
LM50BIM3 from Texas Instruments is a precision analog centigrade temperature sensor in SOT-23-3 package, delivering 10 mV/°C linear output with 500 mV offset at 0°C. It operates from 4.5 V to 10 V supply and achieves ±3°C accuracy over –25°C to +100°C (legacy chip) or –40°C to +125°C (new chip), enabling direct ADC interfacing in battery management and power supply thermal monitoring.
For engineers reviewing the LM50BIM3 datasheet, LM50BIM3 pinout, LM50BIM3 application, or LM50BIM3 equivalent, key selection criteria include its fixed 10 mV/°C gain, 2 kΩ typical output impedance, ±3°C full-range accuracy, low 95 µA quiescent current (legacy), and compatibility with single-supply systems requiring negative-temperature capability without dual rails.
Technical Context
The LM50BIM3 implements a delta-VBE-based temperature-sensing element buffered by a class-A amplifier, producing a ratiometric analog voltage output directly proportional to junction temperature. Its transfer function VO = 10 mV/°C × T(°C) + 500 mV enables absolute temperature measurement without external calibration or software linearization.
Designed for LDO-less operation within its specified 4.5 V–10 V supply range, the device features DC output impedance of 2 kΩ (typ)/4 kΩ (max), supporting stable driving of capacitive loads up to 1 µF. Thermal response time in stirred oil bath is 1.7 s (63%), and long-term drift is ±0.08°C after 1000 hours at 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Range | –25°C to +100°C (legacy chip); –40°C to +125°C (new chip) - defines usable ambient operating envelope for thermal sensing |
| Output Sensitivity | 10 mV/°C ±0.3 mV/°C - enables direct scaling to °C with 100 mV resolution per 10°C step |
| Offset Voltage | 500 mV at 0°C ±10 mV - allows measurement down to –40°C using only positive supply (100 mV output) |
| Accuracy | ±3°C max over full specified temperature range - ensures worst-case error bound for closed-loop thermal control |
| Supply Voltage | 4.5 V to 10 V - compatible with standard 5 V and 9 V rails; excludes LDO dependency |
| Quiescent Current | 95 µA (typ, legacy chip) - supports low-power battery-operated applications with minimal self-heating |
| Output Impedance | 2 kΩ (typ), 4 kΩ (max) - permits direct connection to 12-bit SAR ADCs with ≤100 pF input capacitance |
Pinout & Package
SOT-23-3 (DBZ) package: 2.37 mm × 2.92 mm × 1.1 mm footprint with gull-wing leads; thermally optimized for PCB-mounted thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS (Pin 1) | Power supply input | Accepts 4.5 V–10 V DC; must be bypassed with 0.1 µF capacitor to GND for noise immunity |
| VO (Pin 2) | Analog temperature output | High-impedance voltage source (2 kΩ); connects directly to ADC input or op-amp buffer |
| GND (Pin 3) | Reference ground | Must tie to system power ground plane; forms return path for supply and output current |
Key Features
| Feature | Design Value |
|---|---|
| Industry-standard 10 mV/°C gain + 500 mV offset | Eliminates need for external gain/offset calibration; simplifies firmware and reduces BOM count |
| ±3°C max accuracy over full temperature range | Meets industrial-grade thermal monitoring requirements without trimming or lookup tables |
| 2 kΩ typical output impedance | Drives 1 µF capacitive load directly-enables remote sensing without buffer amplifiers |
| No external components required | Reduces layout area and cost; supports drop-in replacement in existing SOT-23 thermal sensor footprints |
| UL Recognized Component | Validated for safety-critical end equipment including medical instruments and HVAC controls |
Applications
| Battery Management Systems | Power Supply Thermal Monitoring |
|---|---|
Use Scenario: Real-time cell pack temperature tracking in Li-ion battery packs during charge/discharge cycles. IC Role / Device Role / Timing Role: Analog temperature transducer providing continuous voltage output proportional to pack temperature. Use Value: Enables overtemperature cutoff at ±3°C tolerance, preventing thermal runaway without microcontroller intervention. |
Use Scenario: Monitoring heatsink or MOSFET junction temperature in AC/DC and DC/DC converters. IC Role / Device Role / Timing Role: Primary thermal feedback element feeding into protection circuitry or fan speed control loop. Use Value: 10 mV/°C slope allows direct mapping to PWM duty cycle or comparator thresholds with no scaling resistors. |
| HVAC System Control | Medical Instrument Temperature Sensing |
Use Scenario: Ambient and duct air temperature measurement in residential and commercial climate control units. IC Role / Device Role / Timing Role: Centigrade sensor interfaced to HVAC microcontroller ADC for PID-based thermostat regulation. Use Value: 500 mV offset enables accurate sub-zero readings (e.g., refrigerant lines) using single 3.3 V or 5 V supply. |
Use Scenario: Patient-contact surface temperature monitoring in infusion pumps and diagnostic devices. IC Role / Device Role / Timing Role: Safety-critical temperature monitor verifying thermal integrity before device activation. Use Value: UL recognition and ±3°C accuracy support IEC 60601-1 compliance for Class II medical equipment. |
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 |
|---|---|---|---|
| LM50HVDBZR | Wider supply range (3 V–36 V); ±3°C over –20°C to +150°C; 52 µA quiescent current | Supports 12 V/24 V industrial rails without LDO; higher max temp rating | Select when operating beyond 10 V supply or requiring extended high-temp coverage |
| LM35DMX/NOPB | 10 mV/°C gain, 0 mV offset; ±0.5°C typ accuracy at 25°C; 60 µA IQ; SOIC-8 package | Requires negative supply or level-shifting for sub-zero readings; larger footprint | Choose for higher baseline accuracy where 0°C offset is acceptable and board space permits SOIC-8 |
Compared with LM50BIM3, LM50HVDBZR offers broader supply flexibility and extended temperature range but requires validation for legacy 5 V designs, while LM35DMX/NOPB delivers tighter accuracy at room temperature but lacks the 500 mV offset needed for true single-supply negative-temperature operation.
Availability
LM50BIM3 is available at Aetrix Electronics and suitable for battery management systems, power supply thermal monitoring, and HVAC control applications requiring stable component supply across industrial temperature grades and long-lifecycle programs.
Supply support for LM50BIM3 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 global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision sensing and power management ICs.
The LM50 product line was designed specifically for cost-sensitive, high-volume centigrade temperature sensing in consumer, industrial, and medical equipment-emphasizing simplicity, reliability, and drop-in compatibility with legacy thermal sensor footprints.
FAQ
What is the operating temperature range for LM50BIM3?
The LM50BIM3 has two qualified versions: the legacy chip operates from –25°C to +100°C, while the new chip version is rated from –40°C to +125°C. Both share identical electrical specifications and pinout. The reel label and date code indicate which variant is shipped, and both meet the ±3°C accuracy specification over their respective ranges.
Does LM50BIM3 require external calibration or trimming?
No, LM50BIM3 does not require external calibration or trimming. It uses wafer-level trimming to achieve its specified accuracy, and its linear 10 mV/°C output with 500 mV offset at 0°C enables direct temperature reading via ADC without software linearization or lookup tables-reducing firmware complexity and BOM cost.
What is the maximum capacitive load LM50BIM3 can drive?
LM50BIM3 can drive up to 1 µF capacitive load directly without oscillation or settling degradation. This capability stems from its 2 kΩ typical output impedance and internal compensation, making it suitable for noisy environments where RC filtering is needed at the ADC input without adding an external buffer stage.
How does LM50BIM3 differ from LM50HVDBZR?
LM50BIM3 operates from 4.5 V to 10 V and is rated for ±3°C over –25°C to +100°C (legacy) or –40°C to +125°C (new). LM50HVDBZR supports 3 V to 36 V supply and extends accuracy to ±3°C over –20°C to +150°C. LM50HV also draws lower quiescent current (52 µA vs. 95 µA) and is optimized for LDO-less 12 V/24 V systems.
Is LM50BIM3 UL recognized?
Yes, LM50BIM3 is UL Recognized Component (E170777), confirming compliance with UL 60747-1 for discrete semiconductors. This certification validates its suitability in safety-critical end equipment such as medical instruments, HVAC controllers, and industrial power supplies requiring third-party safety approval.
LM50BIM3 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:
- Not For New Designs
- Sensor Type:
- Analog, Local
- Sensing Temperature - Local:
- -25°C ~ 100°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 4.5V ~ 10V
- Resolution:
- 10mV/°C
- Features:
- -
- Accuracy - Highest (Lowest):
- ±2°C (-3.5°C)
- Test Condition:
- 25°C (-25°C ~ 100°C)
- Operating Temperature:
- -40°C ~ 150°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-3
LM50BIM3 FAQ
1.How can I place an order for LM50BIM3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM50BIM3 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 LM50BIM3 reliable?
The price and inventory of LM50BIM3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM50BIM3 is usually 5 days.
3.What payment methods are accepted for LM50BIM3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM50BIM3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM50BIM3?
LM50BIM3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM50BIM3 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 LM50BIM3?
For technical support, including LM50BIM3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM50BIM3 requirements.
6.How does Aetrix verify that LM50BIM3 is sourced from the original manufacturer or authorized distributors?
All LM50BIM3 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 LM50BIM3 meets industry standards.
7.What is the process for return or replacement of LM50BIM3?
All LM50BIM3 units undergo pre-shipment inspection (PSI). If there is an issue with LM50BIM3, 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 LM50BIM3 part is unused and in its original packaging.
Return procedure for LM50BIM3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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