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LM235AH
Texas Instruments
SENSOR ANALOG -40C-125C TO46-3
1665 Pcs New Original In Stock
Temperature Sensor Analog, Local -40°C ~ 125°C 10mV/°C TO-46-3
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5.0 / 5.0
- (357 Ratings)
LM235AH
Product Overview
1299126
DiGi Electronics Part Number
LM235AH-DGManufacturer
Texas Instruments
LM235AH
Description
SENSOR ANALOG -40C-125C TO46-3Inventory
1665 Pcs New Original In Stock
Temperature Sensor Analog, Local -40°C ~ 125°C 10mV/°C TO-46-3
Quantity
Minimum 1
Minimum 1
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LM235AH Technical Specifications
Category
Temperature Sensors, Analog and Digital Output
Packaging
-
Series
-
Product Status
Active
Sensor Type
Analog, Local
Sensing Temperature - Local
-40°C ~ 125°C
Sensing Temperature - Remote
-
Output Type
Analog Voltage
Voltage - Supply
-
Resolution
10mV/°C
Features
-
Accuracy - Highest (Lowest)
±1°C (±2.7°C)
Test Condition
25°C (-40°C ~ 125°C)
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-206AB, TO-46-3 Metal Can
Supplier Device Package
TO-46-3
Base Product Number
LM235
Datasheet & Documents
Datasheets
Download LM235AH Product Specification (PDF)
Manufacturer Product Page
LM235AH Specifications
HTML Datasheet
LM235AH-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Affected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
TEXTISLM235AH
2156-LM235AH-TI
Standard Package
500
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
포장 상태가 뛰어나서 신뢰가 갑니다. 제품도 항상 기대 이상입니다.
de desembre 02, 2025
Their promptness and helpfulness are second to none.
de desembre 02, 2025
Customer service is always accessible and eager to help resolve any issues.
de desembre 02, 2025
I love their prices—high quality at a price that makes sense—plus quick delivery.
de desembre 02, 2025
I can count on DiGi Electronics for quality products and helpful service.
de desembre 02, 2025
Their response time to inquiries is impressively quick, leading to a very satisfying experience.
de desembre 02, 2025
DiGi Electronics has an impressive logistics system that guarantees quick delivery even during peak seasons.
de desembre 02, 2025
Very happy with how quickly my order was shipped and the eco-conscious packaging.
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Frequently Asked Questions (FAQ)
When designing with the LM235AH for high-precision temperature sensing, what are the critical considerations for its analog output interface to avoid common signal chain errors, especially regarding input bias current and reference voltage?
The LM235AH outputs a 10mV/°C analog voltage, but it is not a rail-to-rail buffer; its output impedance is relatively low but not zero. A key design risk is loading the output with a low-impedance ADC input without a buffer, which can cause self-heating and linearity errors. Always use a high-impedance (>>10kΩ) input or a precision op-amp buffer (e.g., OPA237) to prevent current draw that shifts the internal bandgap. Additionally, the LM235AH requires an external supply via a series resistor; its operation is ratiometric to the supply current. For ADC measurement, avoid using the supply voltage as a reference unless it is ultra-stable—use a dedicated external voltage reference (like LM4040) to maintain accuracy across the -40°C to 125°C range, as supply variations directly translate to measurement error.
I am considering replacing an obsolete temperature sensor with the LM235AH in a through-hole TO-46 package. What specific part numbers can it directly replace, and what layout or thermal coupling differences must I account for during PCB re-spin?
The LM235AH is a direct functional and pin-compatible replacement for the legacy LM135AH, LM235AH, and LM335AH series, all using the TO-46-3 metal can package. When replacing an obsolete sensor like the AD590 (which outputs current) or a thermistor circuit, note that the LM235AH requires a different biasing: it operates as a two-terminal zener-like device needing a series resistor (typically 1kΩ to 10kΩ) from a positive supply, not a current source or voltage excitation. For layout, the TO-46 metal can is sensitive to thermal gradients—ensure the PCB has a thermal relief cutout around the leads to isolate it from ground plane heat sinking, unless you intentionally want thermal coupling. For best accuracy, use the metal can’s tab to make direct contact with the measurement surface and minimize air movement, as it lacks a plastic encapsulation's thermal inertia.
In a -40°C to +125°C industrial control application, what are the reliability risks and failure modes when using the LM235AH with a through-hole TO-46 package in high-vibration environments compared to modern surface-mount temperature sensors?
The LM235AH in a TO-46 metal can is mechanically robust but has specific failure modes: lead fatigue due to thermal cycling and vibration, and potential for die attach degradation over extreme temperature swings. Unlike modern SMD sensors (e.g., TMP116, LM73), the LM235AH relies on through-hole leads that act as mechanical stress concentrators. To mitigate vibration-induced failure, avoid cantilevering the device; use adhesive (like thermal epoxy) to secure the can to the PCB or chassis if leads are unsupported. Additionally, the TO-46 package is hermetic, offering superior moisture resistance (MSL 1), making it more reliable in humid environments than plastic SMD sensors, which can suffer from corrosion. However, its analog output is uncalibrated; for long-term stability, ensure the biasing resistor is metal film (low drift) and periodically validate the 10mV/°C slope against a known reference, as the bandgap can exhibit long-term drift of ±0.5°C over 10 years in harsh thermal cycling.
How does the LM235AH's accuracy specification of ±1°C at 25°C and ±2.7°C over -40°C to 125°C translate to real-world system calibration requirements, and can I trim out errors for a 0.5°C accuracy target in a medical or instrumentation design?
The LM235AH’s specified accuracy is a two-point envelope: ±1°C typical at 25°C, and ±2.7°C worst-case across the full range. To achieve 0.5°C system accuracy, you cannot rely on the datasheet alone; you must perform a two-point calibration at the extremes of your operating range (e.g., 0°C and 70°C) using a precision temperature bath. The device’s transfer function is highly linear (10mV/°C) but has a variable offset and slight slope error. By measuring the output voltage at two known temperatures, you can calculate and store unique gain and offset coefficients in firmware to linearize the error to within ±0.3°C to ±0.5°C over a limited range. Note that the LM235AH’s output is sensitive to the bias current—calibration must be performed with the exact biasing resistor and supply voltage used in the final circuit, as variations here will shift the output and invalidate the calibration.
For a battery-powered IoT device requiring remote temperature sensing, what are the power consumption trade-offs and design constraints when using the LM235AH (analog) versus a digital I2C sensor like the TMP102 or LM75A?
The LM235AH is a continuous analog device; its power consumption is determined by the bias current set by the external resistor. Typically, with a 5V supply and a 5kΩ resistor, it draws around 1mA, resulting in 5mW continuous power, which is too high for most battery-operated IoT devices. However, you can power-cycle the LM235AH by switching the supply voltage via a MOSFET (e.g., Si2302) and a GPIO pin, allowing the output to stabilize within about 5-10ms before reading with an ADC. This yields an average current in the microamp range for periodic sampling. In contrast, digital sensors like the TMP102 draw only 10µA during active conversion and 0.5µA in shutdown, simplifying design. The LM235AH offers a cost advantage and better long-term robustness in extreme temperatures, but requires an external ADC and careful power switching. For low-duty-cycle IoT, use a series P-channel FET to disconnect the LM235AH’s bias voltage, and ensure the ADC input is high impedance to avoid sinking current when the sensor is off.
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LM235AH CAD Models
Texas Instruments LM235AH PCB symbols & footprints
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