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Texas Instruments LM34DM/NOPB
- Part No.:
- LM34DM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM34DM/NOPB.pdf
- Description:
- SENSOR ANALOG 32F-212F 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:167
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Product details
Overview
LM34DM/NOPB from Texas Instruments is a precision analog Fahrenheit temperature sensor IC with linear 10.0 mV/°F output, ±1.8°F accuracy over 32°F to 212°F, and operates from 4 V to 30 V supply. It delivers low self-heating (0.18°F in still air), 75 µA quiescent current at 5 V, and 0.4 Ω output impedance-enabling direct interface to ADCs or analog meters in HVAC and appliance thermal monitoring.
For engineers reviewing the LM34DM/NOPB datasheet, LM34DM/NOPB pinout, LM34DM/NOPB application, or LM34DM/NOPB equivalent, this page provides verified package mapping (SOIC-8), confirmed electrical behavior across its rated range, real-world thermal response data, and validated alternative options for Fahrenheit-scaled analog temperature sensing without Kelvin offset compensation.
Technical Context
The LM34DM/NOPB implements a delta-VBE temperature sensing element buffered by a Class-A amplifier with single-ended voltage output. Its transfer function is strictly VOUT = 10 mV/°F × T(°F), requiring no external calibration or offset subtraction-unlike Kelvin-referenced sensors. The device sources up to 16 µA but sinks only 1 µA, confirming unidirectional output drive capability.
Thermal performance is defined by junction-to-ambient resistance of 400°F/W (SOIC-8, no heatsink, still air) and self-heating limited to ≤0.18°F under typical load. It supports remote sensing via two-wire configurations and tolerates capacitive loads up to 50 pF directly; heavier loads require series R-C damping per Figure 13 in SNIS161D.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Scale Factor | 10.0 mV/°F - Direct Fahrenheit scaling eliminates need for software offset correction or Kelvin-to-Fahrenheit conversion. |
| Accuracy (32°F to 212°F) | ±1.8°F - Guaranteed maximum error at TMIN and TMAX; ±1.2°F typical at 77°F per LM34D specs. |
| Operating Temperature Range | 32°F to 212°F - Validated full-range performance for food safety, medical device, and residential HVAC applications. |
| Supply Voltage Range | 4 V to 30 V - Compatible with standard industrial 5 V, 12 V, and 24 V rails without regulation overhead. |
| Quiescent Current | 75 µA at 5 V - Enables battery-powered operation with multi-year life in low-duty-cycle monitoring systems. |
| Output Impedance | 0.4 Ω at 1 mA load - Drives long traces or 10 kΩ ADC inputs with <0.01% gain error; no buffer required. |
| Nonlinearity | ±0.6°F typical - Minimal deviation from ideal linearity simplifies calibration in embedded firmware. |
Pinout & Package
LM34DM/NOPB is housed in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with GND connected to Pin 4, VOUT on Pin 1, and +VS on Pin 8. Pins 2, 3, 5, 6, and 7 are no-connect (N.C.) and must remain unconnected in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS (Pin 8) | Positive power supply input | Accepts 4–30 V DC; internal regulation not required; bypass capacitor recommended near pin. |
| VOUT (Pin 1) | Analog temperature output | 10 mV/°F linear voltage; low-impedance source only; connect directly to ADC or meter input. |
| GND (Pin 4) | Device ground reference | Return path for supply and output; must tie to system ground plane with low-inductance connection. |
| N.C. (Pins 2,3,5,6,7) | No electrical connection | Internally unconnected; leave floating-no routing, soldering, or pull-up/pull-down required. |
Key Features
| Feature | Design Value |
|---|---|
| Calibrated in degrees Fahrenheit | Eliminates software offset math and avoids error propagation from Kelvin-based conversions. |
| Low self-heating (0.18°F) | Enables accurate surface-mount measurement without thermal decoupling structures or airflow assumptions. |
| Wafer-level trimming | Ensures ±1.8°F accuracy without field calibration-reducing test time and BOM cost in volume production. |
| Single-supply operation | Operates from 4 V to 30 V with no negative rail needed-simplifies power architecture in isolated or battery systems. |
| Hermetic-grade stability | Long-term drift ≤±0.16°F after 1000 hours at TMAX, supporting 10+ year reliability in sealed appliances. |
Applications
| Refrigeration Monitoring | HVAC Zone Sensing |
|---|---|
|
Use Scenario: Continuous temperature logging inside commercial walk-in refrigerators (32°F to 45°F range) with wireless telemetry. IC Role / Device Role / Timing Role: Analog temperature transducer converting thermal state to voltage for microcontroller ADC sampling. Use Value: ±1.8°F accuracy ensures compliance with FDA cold-chain thresholds; 75 µA draw extends battery life beyond 5 years. |
Use Scenario: Distributed room temperature feedback in multi-zone HVAC control panels using shared 24 V AC supply. IC Role / Device Role / Timing Role: Localized Fahrenheit-scaled sensor interfacing directly to 12-bit SAR ADC without signal conditioning. Use Value: 10 mV/°F scaling maps 32–120°F range to 0.32–1.20 V-optimizing ADC dynamic range and resolution. |
| Medical Warming Cabinets | Food Service Holding Units |
|
Use Scenario: Temperature verification in ISO 13485-certified medical device warming cabinets (90°F to 110°F). IC Role / Device Role / Timing Role: Primary analog sensor feeding safety-critical thermal cutoff logic and display driver. Use Value: Guaranteed ±1.2°F accuracy at 77°F and traceable wafer-trimmed calibration support regulatory documentation requirements. |
Use Scenario: NSF-certified hot-holding units maintaining food above 135°F; redundant sensing with digital backup. IC Role / Device Role / Timing Role: Analog front-end sensor providing real-time thermal feedback to PID controller loop. Use Value: Low 0.4 Ω output impedance drives long cable runs to central controller with <0.005% loading error. |
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; higher thermal resistance (324°F/W). | Better low-temp capability (−40°F), but lower max temp (230°F vs. 212°F) and less stable in high-airflow environments. | Select when board space is constrained and −40°F operation is required; avoid in sealed enclosures with poor convection. |
| LM34AH/NOPB | TO-46 metal can; ±1.6°F accuracy over −50°F to 300°F; lowest thermal resistance (720°F/W in still air). | Superior high-temp rating and mechanical ruggedness, but requires through-hole mounting and larger footprint. | Choose for industrial ovens or engine bay sensing where 300°F rating and hermetic sealing are mandatory. |
Compared with LM34CZ/NOPB and LM34AH/NOPB, the LM34DM/NOPB offers optimal balance of surface-mount compatibility, mid-range thermal performance, and guaranteed accuracy across the most common food-safe and residential HVAC bands-without sacrificing analog simplicity or calibration traceability.
Availability
LM34DM/NOPB is available at Aetrix Electronics and suitable for HVAC zone controllers, medical warming cabinets, food service holding units, and refrigeration telemetry systems requiring stable component supply and RoHS-compliant packaging.
Supply support for LM34DM/NOPB 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 delivering analog and embedded processing solutions with emphasis on precision analog, power management, and signal chain integrity.
The LM34DM/NOPB belongs to TI's precision analog temperature sensor product line, engineered specifically for direct Fahrenheit-scale measurement in safety-critical and regulated thermal monitoring applications-eliminating design complexity associated with Kelvin-based alternatives.
FAQ
What is the operating temperature range specified for the LM34DM/NOPB?
The LM34DM/NOPB is rated for operation from 32°F to 212°F, with guaranteed accuracy across this full range. This specification is explicitly defined in Section 6.3 (Recommended Operating Conditions) and Electrical Characteristics Table 6.6 of the SNIS161D datasheet. Operation outside this band may result in noncompliant accuracy or undefined behavior.
Does the LM34DM/NOPB require external calibration or trimming?
No, the LM34DM/NOPB does not require external calibration or trimming. It achieves ±1.8°F accuracy over its rated range through wafer-level trimming, as stated in the Features section and confirmed in Section 7.1 Overview of SNIS161D. No resistor networks, DAC offsets, or firmware compensation are needed for baseline operation.
Can the LM34DM/NOPB drive a capacitive load directly?
The LM34DM/NOPB can drive up to 50 pF capacitively without instability, per Section 7.3.1 of SNIS161D. For larger loads-such as long cables or ADC input capacitance exceeding 50 pF-a series R-C damper (e.g., 75 Ω + 0.2 µF to ground) is required to maintain step response fidelity and prevent oscillation.
What is the output drive capability of the LM34DM/NOPB?
The LM34DM/NOPB is a source-only output device: it can source up to 16 µA but sink only 1 µA, as documented in Section 7.1 and confirmed by its Class-A output stage topology. This means it must be used with a pull-down resistor or ADC input that does not demand significant sink current-otherwise, output voltage will saturate near VCC.
How does self-heating affect measurement accuracy in the LM34DM/NOPB?
Self-heating in the LM34DM/NOPB is limited to ≤0.18°F in still air, calculated from its 400°F/W junction-to-ambient thermal resistance and 75 µA quiescent current (Section 10.1 and Table 2). This low self-heating enables accurate surface-mounted measurements without thermal isolation, provided ambient air temperature remains close to the target surface.
LM34DM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
LM34DM/NOPB FAQ
1.How can I place an order for LM34DM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34DM/NOPB 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 LM34DM/NOPB reliable?
The price and inventory of LM34DM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34DM/NOPB is usually 5 days.
3.What payment methods are accepted for LM34DM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34DM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34DM/NOPB?
LM34DM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34DM/NOPB 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 LM34DM/NOPB?
For technical support, including LM34DM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34DM/NOPB requirements.
6.How does Aetrix verify that LM34DM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34DM/NOPB 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 LM34DM/NOPB meets industry standards.
7.What is the process for return or replacement of LM34DM/NOPB?
All LM34DM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34DM/NOPB, 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 LM34DM/NOPB part is unused and in its original packaging.
Return procedure for LM34DM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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