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Texas Instruments LM34DH
- Part No.:
- LM34DH
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
LM34DH.pdf
- Description:
- SENSOR ANALOG 32F-212F TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,614
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Product details
Overview
LM34DH from Texas Instruments is a precision analog Fahrenheit temperature sensor in hermetic TO-46 (NDV) package, delivering 10.0 mV/°F linear output with ±1.2°F accuracy at 77°F and rated for 0°F to 100°F operating range. It draws only 75 µA quiescent current, features 0.4 Ω output impedance, and requires no external calibration-enabling direct interface to ADCs or analog meters in HVAC monitoring and appliance thermal control.
For engineers reviewing the LM34DH datasheet, LM34DH pinout, LM34DH application, or LM34DH equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The LM34DH uses a delta-VBE temperature sensing architecture buffered by a class-A amplifier, producing a ratiometric analog voltage output directly proportional to ambient Fahrenheit temperature. Its output stage sources up to 16 µA but sinks only 1 µA, requiring high-impedance or actively biased loads.
It operates from 4 V to 30 V supply, exhibits ±0.6°F typical nonlinearity over its rated range, and achieves low self-heating (<0.18°F in still air) due to sub-100 µA quiescent current and hermetic metal packaging with 43°F/W junction-to-case thermal resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Scale Factor | 10.0 mV/°F - enables direct voltage-to-temperature conversion without scaling math or offset subtraction |
| Accuracy (77°F) | ±1.2°F - ensures <1.6% full-scale error at room temperature for reliable setpoint detection |
| Operating Range | 0°F to 100°F - validated for refrigeration, incubator, and food safety monitoring applications |
| Quiescent Current | 75 µA at 5 V - supports battery-powered remote sensors with multi-year runtime on AA cells |
| Output Impedance | 0.4 Ω at 1 mA load - allows direct connection to 12-bit SAR ADCs without buffer amplification |
| Supply Voltage Range | 4 V to 30 V - compatible with industrial 24 V rails and automotive 12 V systems with transient tolerance |
| Thermal Resistance (J-C) | 43°F/W - enables rapid thermal response when mounted to metal surfaces via solder or thermal epoxy |
Pinout & Package
LM34DH is housed in a hermetic 3-pin TO-46 (NDV) metal can package with case connected to GND. The device uses bottom-view pinout: Pin 1 = +VS, Pin 2 = VOUT, Pin 3 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS | Positive power supply input | Accepts 4–30 V DC; internal regulation eliminates need for external LDO in noisy 24 V systems |
| VOUT | Analog temperature output | Low-impedance voltage source (0.4 Ω); connects directly to ADC input or op-amp buffer without series resistor |
| GND | Ground reference and case connection | Case is electrically tied to GND-requires isolation from heated surfaces unless intentional thermal coupling is desired |
Key Features
| Feature | Design Value |
|---|---|
| Wafer-level trimming | Eliminates post-assembly calibration labor and test fixtures, reducing BOM cost in high-volume appliance production |
| Fahrenheit-native output | Removes software offset calculation (e.g., −459.67°F) required by Kelvin-scaled sensors, simplifying firmware for US-market HVAC controllers |
| Hermetic TO-46 package | Provides moisture and corrosion immunity in humid environments like commercial refrigerators and steam sterilizers |
| Low self-heating (0.18°F) | Ensures measurement fidelity when mounted on thermally isolated PCBs or small heatsinks without active cooling |
| ESD robustness (±2500 V HBM) | Supports manual handling and board-level assembly without special ESD protocols in standard manufacturing lines |
Applications
| Refrigeration Monitoring | Medical Incubator Control |
|---|---|
Use Scenario: Continuous temperature logging inside pharmaceutical cold storage units maintaining 36–46°F compliance. IC Role / Device Role / Timing Role: Analog temperature transducer providing calibrated voltage output to microcontroller ADC every 5 seconds. Use Value: ±1.2°F accuracy at 77°F and 0.18°F self-heating ensure readings reflect true chamber temperature-not sensor self-warming artifact. |
Use Scenario: Closed-loop thermal regulation in neonatal incubators requiring stable 90–98°F air temperature. IC Role / Device Role / Timing Role: Primary feedback sensor feeding analog PID controller driving resistive heater elements. Use Value: Hermetic TO-46 package prevents condensation-induced drift during humidity cycling; 10 mV/°F slope simplifies gain-setting in analog control circuitry. |
| Food Safety Thermometry | Industrial Oven Ambient Sensing |
Use Scenario: Spot-checking internal temperature of cooked meats using handheld probe with embedded LM34DH. IC Role / Device Role / Timing Role: Core sensing element in battery-powered digital thermometer with LCD readout. Use Value: 75 µA quiescent current extends alkaline battery life beyond 2 years; 0°F to 100°F range covers USDA critical limits (41°F hold, 135°F cook). |
Use Scenario: Monitoring ambient air temperature near conveyor-fed baking ovens where plastic-packaged sensors degrade. IC Role / Device Role / Timing Role: Environmental monitor interfaced to PLC analog input module via twisted-pair wiring. Use Value: Metal TO-46 case withstands 100°F+ ambient without parameter shift; 4–30 V supply range tolerates 24 VDC field wiring drop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Fahrenheit temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM34CZ/NOPB | TO-92 plastic package; ±1.6°F accuracy over −40°F to 230°F range; higher self-heating (0.2°F) | Lower-cost option for non-humid, non-corrosive environments like consumer electronics enclosures | Select when moisture resistance is unnecessary and wider temperature range justifies trade-off in long-term stability |
| LM34DM/NOPB | SOIC-8 surface-mount package; same 0°F to 100°F range; ±1.2°F accuracy; 400°F/W junction-to-ambient thermal resistance | Preferred for automated PCB assembly and space-constrained designs where hermetic sealing is secondary to footprint size | Choose for reflow-compatible layouts requiring 8-pin SOIC footprint and compatibility with pick-and-place equipment |
Compared with LM34DH, LM34CZ/NOPB trades hermetic reliability for lower cost and wider range in plastic packaging, while LM34DM/NOPB offers SMT manufacturability at the expense of reduced thermal coupling efficiency-making LM34DH optimal for ruggedized, humidity-prone, or thermally coupled deployments.
Availability
LM34DH is available at Aetrix Electronics and suitable for refrigeration monitoring, medical incubator control, and food safety thermometry requiring stable component supply across multi-year production cycles.
Supply support for LM34DH 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 design and high-reliability packaging.
The LM34DH belongs to TI's precision analog temperature sensor product line, engineered specifically for direct Fahrenheit-readout applications in regulated environments where hermetic integrity and long-term calibration stability are critical.
FAQ
What is the operating temperature range specified for the LM34DH?
The LM34DH is rated for 0°F to 100°F operating temperature range per TI's SNIS161D datasheet Revision D. This range is narrower than the full −50°F to 300°F capability of the base LM34 family, reflecting factory characterization and guaranteed performance validation specific to the LM34DH variant. Operation outside this range may yield unverified accuracy or increased nonlinearity.
Does the LM34DH require external calibration or trimming?
No, the LM34DH does not require external calibration or trimming. It is wafer-level trimmed to deliver ±1.2°F accuracy at 77°F and maintains linearity within ±0.6°F typical nonlinearity across its 0°F to 100°F range. This eliminates production test overhead and ensures consistent performance across batches without user intervention.
How is the LM34DH pinout configured in its TO-46 package?
The LM34DH uses a bottom-view pinout for its TO-46 (NDV) package: Pin 1 is +VS, Pin 2 is VOUT, and Pin 3 is GND. The metal case is internally connected to GND, so mechanical mounting to grounded metal surfaces electrically ties the case to system ground-enabling thermal conduction while avoiding floating ground issues.
Can the LM34DH drive an ADC input directly without a buffer amplifier?
Yes, the LM34DH can drive most 12-bit SAR ADC inputs directly. Its 0.4 Ω output impedance and ability to source 16 µA allow it to settle quickly into typical 10 kΩ–1 MΩ ADC input impedances. For high-resolution (>14-bit) or multiplexed sampling, a unity-gain buffer is recommended to prevent loading-induced gain error.
What is the maximum supply voltage the LM34DH can tolerate?
The LM34DH has an absolute maximum supply voltage rating of 35 V, but its recommended operating range is 4 V to 30 V. Operating above 30 V risks exceeding internal power dissipation limits, especially at elevated temperatures, and may accelerate long-term drift. For 24 V industrial systems, operation at 24 V is fully supported and commonly deployed.
LM34DH 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:
- 32°F ~ 212°F
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 4V ~ 30V
- Resolution:
- 10mV/°F
- Features:
- -
- Accuracy - Highest (Lowest):
- ±3°F
- Test Condition:
- 77°F
- Operating Temperature:
- 0°C ~ 100°C
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- TO-46-3
LM34DH FAQ
1.How can I place an order for LM34DH through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34DH 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 LM34DH reliable?
The price and inventory of LM34DH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34DH is usually 5 days.
3.What payment methods are accepted for LM34DH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34DH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34DH?
LM34DH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34DH 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 LM34DH?
For technical support, including LM34DH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34DH requirements.
6.How does Aetrix verify that LM34DH is sourced from the original manufacturer or authorized distributors?
All LM34DH 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 LM34DH meets industry standards.
7.What is the process for return or replacement of LM34DH?
All LM34DH units undergo pre-shipment inspection (PSI). If there is an issue with LM34DH, 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 LM34DH part is unused and in its original packaging.
Return procedure for LM34DH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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