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Texas Instruments LM34AH
- Part No.:
- LM34AH
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
LM34AH.pdf
- Description:
- SENSOR ANALOG -50F-300F TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,310
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Product details
Overview
LM34AH from Texas Instruments is a precision analog Fahrenheit temperature sensor in a hermetic TO-46 (NDV) package, delivering 10.0 mV/°F linear output, ±0.4°F accuracy at 77°F, and full-range operation from −50°F to 300°F. It requires no external calibration, draws less than 90 µA, and interfaces directly to ADCs or analog meters in HVAC monitoring, battery thermal management, and industrial oven control.
For engineers reviewing the LM34AH datasheet, LM34AH pinout, LM34AH application, or LM34AH equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives with functional and application-level differences, and supply-chain support details specific to the LM34AH/NOPB variant.
Technical Context
The LM34AH 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 for Fahrenheit scaling.
It operates from 5 V to 30 V supply, exhibits ≤0.5°F typical nonlinearity over −50°F to 300°F, and achieves <0.18°F self-heating in still air due to sub-90 µA quiescent current. The TO-46 metal can is internally connected to GND, providing inherent shielding and mechanical mounting capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Scale Factor | 10.0 mV/°F - Direct voltage-to-Fahrenheit mapping; eliminates software offset correction or Kelvin-to-Fahrenheit conversion. |
| Accuracy at 77°F | ±0.4°F (tested limit) - Enables high-fidelity ambient temperature monitoring in lab-grade instrumentation without trimming. |
| Operating Range | −50°F to 300°F - Supports cryogenic storage monitoring and high-temp industrial process sensing in single-device solution. |
| Supply Voltage Range | 5 V to 30 V - Compatible with unregulated 12 V or 24 V industrial rails; no LDO required for power conditioning. |
| Quiescent Current | 75 µA at 5 V / 76 µA at 30 V - Enables multi-year battery life in remote wireless sensors powered by coin cells or Li-SOCl₂. |
| Output Impedance | 0.4 Ω at 1 mA load - Drives long cables or 1 kΩ ADC input stages without gain error or settling delay. |
| Self-Heating Error | 0.18°F in still air - Minimizes measurement bias when mounted on thermally isolated surfaces or low-mass PCBs. |
Pinout & Package
LM34AH uses the hermetic 3-pin TO-46 (NDV) metal can package (4.699 mm × 4.699 mm). The case is electrically connected to the GND pin, enabling direct thermal conduction to heatsinks or chassis ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS | Positive power supply input | Accepts 5–30 V DC; reverse-polarity protection not integrated - external diode required if supply may be inverted. |
| VOUT | Analog temperature output | Low-impedance voltage source (0.4 Ω); outputs 10 mV per °F; sinks up to 1 µA, sources up to 16 µA - not suitable for sinking logic inputs. |
| GND | Ground reference and case connection | Must be tied to system ground; metal case serves as EMI shield and thermal path - soldering case to metal surface improves thermal response. |
Key Features
| Feature | Design Value |
|---|---|
| Wafer-level trimming | Eliminates post-packaging calibration; ensures ±0.4°F accuracy at 77°F without field adjustment or test fixtures. |
| Fahrenheit-native scaling | Outputs 10 mV/°F with zero offset - avoids arithmetic overhead and floating-point errors in microcontroller firmware. |
| Hermetic TO-46 packaging | Enables reliable operation in humid, corrosive, or high-vibration environments where plastic TO-92 would degrade. |
| Low self-heating | 0.18°F max in still air - preserves measurement fidelity on thermally sensitive substrates like PCB traces or thin-walled enclosures. |
| Single-supply operation | Operates from 5 V to 30 V with no negative rail - simplifies power architecture in industrial controllers and automotive auxiliary systems. |
Applications
| Industrial Oven Monitoring | HVAC Duct Temperature Sensing |
|---|---|
Use Scenario: Continuous temperature logging inside 250°F baking ovens with stainless-steel ductwork and steam exposure. IC Role / Device Role / Timing Role: Analog temperature transducer converting oven cavity temperature to proportional voltage for PLC analog input modules. Use Value: Hermetic TO-46 package withstands condensation and thermal cycling; ±0.4°F accuracy enables tight PID control of bake profiles within ±1.5°F tolerance. |
Use Scenario: Distributed air temperature measurement across 20+ HVAC supply ducts in commercial buildings. IC Role / Device Role / Timing Role: Remote analog sensor interfaced via twisted-pair wiring to centralized building management system (BMS) controller. Use Value: 0.4 Ω output impedance rejects noise over 100-ft cable runs; 75 µA supply current allows daisy-chained 24 V bus powering dozens of sensors. |
| Battery Thermal Protection | Laboratory Incubator Control |
Use Scenario: Real-time cell temperature monitoring in Li-ion battery packs for UPS and medical portable devices. IC Role / Device Role / Timing Role: Primary safety sensor feeding analog voltage to battery management IC's ADC channel for overtemperature cutoff. Use Value: −50°F to 300°F range covers cold-charge and thermal runaway conditions; low self-heating prevents false triggers during high-current discharge. |
Use Scenario: Precision temperature regulation in biomedical incubators requiring stable 95–104°F operation with ±0.5°F uniformity. IC Role / Device Role / Timing Role: Reference-grade sensor in closed-loop feedback path for PID heater controller with analog setpoint interface. Use Value: ±0.4°F accuracy at 77°F and <0.5°F nonlinearity ensure chamber stability meets ISO 13485 environmental validation requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM35DH/NOPB | Centigrade output (10 mV/°C), same TO-46 package, ±0.5°C accuracy at 25°C, 4–30 V supply | Requires °C-to-°F conversion in firmware; lower max temp (110°C vs 149°C) limits high-heat use cases | Select when system already uses °C-based calibration or when interfacing with legacy °C-only ADC references. |
| LM34CAH/NOPB | Same Fahrenheit scaling, but rated −40°F to 230°F, ±0.4°F accuracy at 77°F, identical TO-46 package and pinout | Narrower temperature range excludes cryogenic or >230°F industrial processes; optimized for cost-sensitive consumer HVAC | Choose for cost-sensitive designs where full −50°F to 300°F range is unnecessary and RoHS compliance is mandatory. |
Compared with LM34DH/NOPB and LM34CAH/NOPB, the LM34AH offers the widest operating range (−50°F to 300°F) and highest temperature rating (149°C), making it the only option among the three qualified for continuous use in sterilization cycles, high-temp manufacturing, and aerospace thermal vacuum testing.
Availability
LM34AH is available at Aetrix Electronics and suitable for industrial oven monitoring, HVAC duct sensing, and battery thermal protection requiring stable component supply across extended product lifecycles and harsh environmental conditions.
Supply support for LM34AH 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 heritage in precision analog signal conditioning and sensor interface ICs.
The LM34AH belongs to TI's precision analog temperature sensor product line, engineered specifically for direct Fahrenheit-scale measurement in industrial, medical, and laboratory instrumentation where offset-free scaling and hermetic reliability are critical.
FAQ
What is the maximum operating temperature of the LM34AH?
The LM34AH is rated for continuous operation from −50°F to 300°F (−45.6°C to 148.9°C). This 300°F upper limit is validated per TI's SNIS161D datasheet and distinguishes it from variants like LM34CAH (230°F max) and LM34DH (212°F max), making LM34AH suitable for high-temperature industrial processes such as oven curing and sterilization cycles.
Does the LM34AH require external calibration or trimming?
No, the LM34AH does not require external calibration or trimming. It is factory trimmed at the wafer level to deliver ±0.4°F accuracy at 77°F and maintains ≤±1.6°F total error across its full −50°F to 300°F range. This eliminates production-line calibration steps and reduces test time and cost in high-volume manufacturing of temperature-sensing equipment.
Can the LM34AH drive an ADC input directly?
Yes, the LM34AH can drive most SAR and delta-sigma ADC inputs directly. With a typical output impedance of 0.4 Ω and ability to source 16 µA, it settles rapidly into input capacitances ≤100 pF. For higher-capacitance ADCs (e.g., >500 pF), a 100 Ω series resistor is recommended to prevent instability, as documented in TI's Figure 12 and Figure 13.
Is the metal case of the LM34AH electrically connected?
Yes, the metal case of the LM34AH (TO-46/NDV package) is internally connected to the GND pin. This provides both EMI shielding and a low-thermal-resistance path to mounting surfaces. When soldered to a metal chassis or heatsink, the case becomes part of the system ground plane and enhances thermal coupling - critical for accurate surface temperature measurement.
What is the supply current of the LM34AH at 30 V?
At 30 V supply and 77°F ambient, the LM34AH draws 76 µA (typical) and up to 103 µA (tested maximum), per Section 6.5 of the SNIS161D datasheet. This ultra-low quiescent current enables multi-year operation from primary lithium batteries in remote monitoring nodes and eliminates thermal loading concerns in precision measurement setups.
LM34AH 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:
- -50°F ~ 300°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 (-50°F ~ 300°F)
- Operating Temperature:
- -45°C ~ 149°C
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- TO-46-3
LM34AH FAQ
1.How can I place an order for LM34AH through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34AH 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 LM34AH reliable?
The price and inventory of LM34AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34AH is usually 5 days.
3.What payment methods are accepted for LM34AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34AH?
LM34AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34AH 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 LM34AH?
For technical support, including LM34AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34AH requirements.
6.How does Aetrix verify that LM34AH is sourced from the original manufacturer or authorized distributors?
All LM34AH 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 LM34AH meets industry standards.
7.What is the process for return or replacement of LM34AH?
All LM34AH units undergo pre-shipment inspection (PSI). If there is an issue with LM34AH, 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 LM34AH part is unused and in its original packaging.
Return procedure for LM34AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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