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Texas Instruments LM34CAH
- Part No.:
- LM34CAH
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
LM34CAH.pdf
- Description:
- SENSOR ANALOG -40F-230F TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,459
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Product details
Overview
LM34CAH from Texas Instruments is a precision analog Fahrenheit temperature sensor in a hermetic TO-46 metal can package, delivering 10.0 mV/°F linear output, ±1.0°F accuracy at 77°F, and operation across −40°F to +230°F. It requires no external calibration, draws less than 90 µA, and interfaces directly with ADCs or analog meters in HVAC monitoring and appliance thermal management.
For engineers reviewing the LM34CAH datasheet, LM34CAH pinout, LM34CAH application, or LM34CAH equivalent, this page delivers verified specifications, package mapping, real-world use scenarios, and validated alternative options for industrial temperature sensing designs requiring direct Fahrenheit scaling and low self-heating.
Technical Context
The LM34CAH implements a delta-VBE temperature-sensing element buffered by a class-A amplifier with 0.4 Ω typical output impedance, enabling direct drive of 1-mA loads without external buffering. Its transfer function is strictly VOUT = 10 mV/°F × T(°F), with no offset subtraction required.
It operates from 5 V to 30 V supply, exhibits ≤0.5°F typical nonlinearity over its full range, and achieves <0.18°F self-heating in still air due to sub-90 µA quiescent current - making it suitable for remote, low-power, and thermally isolated sensing nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Scale Factor | 10.0 mV/°F - enables direct voltage-to-temperature conversion without software offset compensation |
| Accuracy (at 77°F) | ±1.0°F - guaranteed tested limit ensures reliable room-temperature calibration reference |
| Operating Range | −40°F to +230°F - supports industrial appliance and HVAC environments with wide ambient extremes |
| Supply Voltage Range | 5 V to 30 V - compatible with standard industrial power rails and battery-backed systems |
| Quiescent Current | <90 µA - minimizes self-heating (<0.18°F) and extends battery life in remote sensors |
| Output Impedance | 0.4 Ω (at 1-mA load) - drives long cables or ADC inputs without signal degradation |
| Nonlinearity | ±0.5°F typical - ensures high-fidelity linear response across full operating range |
Pinout & Package
LM34CAH uses the hermetic TO-46 (NDV) 3-pin metal can package with case connected to GND. Pin identification is defined from bottom view per TI SNIS161D Rev D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS | Positive power supply input | Accepts 5–30 V DC; connects to system VCC or regulated rail |
| VOUT | Analog temperature output | Provides 10 mV/°F linear voltage referenced to GND; drives 1-mA loads directly |
| GND | Ground reference and case connection | Must be tied to system ground; metal case serves as thermal path and EMI shield |
Key Features
| Feature | Design Value |
|---|---|
| Wafer-level trimming | Eliminates need for post-package calibration, reducing BOM count and assembly cost |
| Fahrenheit-native scaling | Removes requirement for Kelvin-to-Fahrenheit math or fixed-offset subtraction in firmware |
| Low self-heating | 0.18°F max in still air ensures measurement fidelity in thermally isolated or sealed enclosures |
| Hermetic TO-46 package | Enables long-term reliability in humid, corrosive, or high-vibration environments (e.g., refrigeration units) |
| Single-supply operation | Simplifies power design - no negative rail needed for analog readout or control circuitry |
Applications
| Refrigeration Monitoring | HVAC Zone Sensing |
|---|---|
|
Use Scenario: Continuous temperature logging inside commercial walk-in coolers and freezer compartments where condensation and thermal cycling occur. IC Role / Device Role / Timing Role: Analog temperature transducer providing millivolt-level output proportional to internal air temperature. Use Value: ±1.0°F accuracy at 77°F and −40°F to +230°F range ensure compliance with food safety storage standards without recalibration. |
Use Scenario: Distributed thermal sensing across multiple ducts and zones in large-building HVAC systems with centralized controller readout. IC Role / Device Role / Timing Role: Remote analog sensor interfacing via twisted-pair wiring to PLC analog input modules. Use Value: Low 90-µA current draw and 0.4-Ω output impedance enable stable signal transmission over 10+ meter cable runs. |
| Industrial Oven Control | Appliance Thermal Protection |
|
Use Scenario: Closed-loop temperature feedback in electric convection ovens and curing chambers operating up to 230°F. IC Role / Device Role / Timing Role: Primary process temperature sensor feeding analog input of PID controller board. Use Value: Hermetic TO-46 package withstands sustained high-temperature exposure and resists oxidation in heated air streams. |
Use Scenario: Overtemperature cutoff in microwave ovens, dishwashers, and clothes dryers where rapid thermal response and reliability are critical. IC Role / Device Role / Timing Role: Safety-critical thermal monitor triggering shutdown if internal cabinet temperature exceeds threshold. Use Value: Guaranteed ±1.0°F accuracy at 77°F and low self-heating prevent nuisance trips while ensuring timely fault detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Fahrenheit temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM34AH/NOPB | Wider operating range (−50°F to +300°F); ±0.8°F accuracy at 77°F; same TO-46 package | Required for high-temp industrial processes exceeding 230°F (e.g., kilns, steam systems) | Select LM34AH/NOPB when full −50°F to +300°F range and tighter room-temp accuracy are mandatory |
| LM34CAZ/NOPB | Same −40°F to +230°F range and ±1.0°F accuracy, but in plastic TO-92 (LP) package | Better suited for PCB-mounted, cost-sensitive consumer appliances with lower environmental stress | Choose LM34CAZ/NOPB for surface-mount compatibility, lower unit cost, and non-hermetic indoor use |
Compared with LM34CAH, LM34AH/NOPB offers extended high-temperature capability and improved baseline accuracy, while LM34CAZ/NOPB trades hermetic reliability for TO-92 cost and assembly efficiency - all three share identical electrical functionality and pinout within their respective packages.
Availability
LM34CAH is available at Aetrix Electronics and suitable for HVAC monitoring, industrial oven control, and appliance thermal protection requiring stable component supply, long-lifecycle support, and RoHS-compliant hermetic packaging.
Supply support for LM34CAH 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 sensor ICs and industrial-grade signal conditioning.
The LM34 series was designed specifically for direct Fahrenheit temperature measurement in industrial, appliance, and HVAC applications - eliminating software offset math and enabling robust analog interfacing with minimal external components.
FAQ
What is the operating temperature range of the LM34CAH?
The LM34CAH is rated for continuous operation from −40°F to +230°F. This range is validated per TI's SNIS161D datasheet Section 6.3, and applies specifically to the LM34CAH variant in the TO-46 (NDV) package. Operation outside this range may result in parametric deviation or permanent damage.
Does the LM34CAH require external calibration or trimming?
No, the LM34CAH does not require external calibration or trimming. It is factory-trimmed at the wafer level to deliver ±1.0°F accuracy at 77°F and linear 10.0 mV/°F scaling across its full range - confirmed in Electrical Characteristics Table 6.5 of the official datasheet.
What package type is used for the LM34CAH?
The LM34CAH uses the hermetic TO-46 metal can package (TI designation NDV), with 3 pins and bottom-view pinout. The case is internally connected to GND, providing both thermal conduction and EMI shielding - distinct from the plastic TO-92 used in LM34CAZ/NOPB.
Can the LM34CAH operate from a 3.3 V supply?
No, the LM34CAH requires a minimum supply voltage of 4 V (per Section 6.3 Recommended Operating Conditions), and is specified for 5 V to 30 V operation. At 3.3 V, output voltage headroom becomes insufficient to maintain linearity above ~250°F, and device behavior is not guaranteed.
How does the LM34CAH differ from the LM35 in practical design?
The LM34CAH outputs 10 mV/°F and is calibrated in Fahrenheit, while the LM35 outputs 10 mV/°C and is centigrade-referenced. For U.S.-centric HVAC or appliance designs requiring Fahrenheit display or control logic, LM34CAH eliminates software conversion and avoids error propagation from °C-to-°F math - a key differentiator confirmed in TI's device comparison guidance.
LM34CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-206AB, TO-46-3 Metal Can
- Packaging:
- Bulk
- Product Status:
- Active
- Sensor Type:
- Analog, Local
- Sensing Temperature - Local:
- -40°F ~ 230°F
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 4V ~ 30V
- Resolution:
- 10mV/°F
- Features:
- -
- Accuracy - Highest (Lowest):
- ±1°F (±2°F)
- Test Condition:
- 77°F (230°F)
- Operating Temperature:
- -40°C ~ 110°C
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- TO-46-3
LM34CAH FAQ
1.How can I place an order for LM34CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34CAH 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 LM34CAH reliable?
The price and inventory of LM34CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34CAH is usually 5 days.
3.What payment methods are accepted for LM34CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34CAH?
LM34CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34CAH 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 LM34CAH?
For technical support, including LM34CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34CAH requirements.
6.How does Aetrix verify that LM34CAH is sourced from the original manufacturer or authorized distributors?
All LM34CAH 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 LM34CAH meets industry standards.
7.What is the process for return or replacement of LM34CAH?
All LM34CAH units undergo pre-shipment inspection (PSI). If there is an issue with LM34CAH, 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 LM34CAH part is unused and in its original packaging.
Return procedure for LM34CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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