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Texas Instruments LM34DZ/LFT7
- Part No.:
- LM34DZ/LFT7
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM34DZ/LFT7.pdf
- Description:
- SENSOR ANALOG 32F-212F TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,103
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Product details
Overview
LM34DZ/LFT7 from Texas Instruments is a precision analog Fahrenheit temperature sensor in TO-92 plastic package, delivering 10.0 mV/°F linear output, ±1.8°F accuracy over +32°F to +212°F, and 75 µA quiescent current. It operates from 4 V to 30 V supply and requires no external calibration - used directly in HVAC sensing, appliance thermal monitoring, and battery-powered environmental logging.
For engineers reviewing the LM34DZ/LFT7 datasheet, LM34DZ/LFT7 pinout, LM34DZ/LFT7 application, or LM34DZ/LFT7 equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and thermal differences.
Technical Context
The LM34DZ/LFT7 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 exclusively in analog output mode with no digital interface, sleep states, or configuration registers. Thermal self-heating is limited to ≤0.18°F in still air due to sub-100 µA supply current and low power dissipation, making it suitable for thermally isolated mounting in plastic enclosures or PCB-mounted remote sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Scale Factor | 10.0 mV/°F - enables direct ADC conversion with 0.1°F LSB resolution using 12-bit 3.3 V ADC |
| Accuracy (TA = 77°F) | ±1.2°F - guarantees <1.5°F error at room temperature without trimming or system calibration |
| Operating Range | +32°F to +212°F - validated for food safety, steam line, and residential HVAC applications |
| Supply Voltage Range | 4 V to 30 V - supports single-supply industrial 5 V, 12 V, and 24 V systems without regulation |
| Quiescent Current | 75 µA at 5 V - allows >1-year battery life in coin-cell–powered data loggers at 1 Hz sampling |
| Output Impedance | 0.4 Ω at 1 mA load - drives long traces or RC filters without gain error or phase shift |
| Nonlinearity | ±0.6°F typical - introduces <0.3% full-scale error across operating range, negligible for control loops |
Pinout & Package
LM34DZ/LFT7 uses the standard 3-pin TO-92 (LP) plastic package, 4.30 mm × 4.30 mm body size, with case unconnected and GND pin electrically isolated from package metal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS | Positive power supply input | Accepts 4–30 V DC; internal regulator ensures stable biasing independent of supply ripple |
| VOUT | Analog temperature output | Source-only output; delivers 10 mV/°F referenced to GND; sinks ≤1 µA - requires pull-down only if high-Z inputs used |
| GND | Ground reference terminal | Must connect to system ground plane; serves as return path for supply and output current; not internally tied to case |
Key Features
| Feature | Design Value |
|---|---|
| Fahrenheit-linear output | Eliminates software offset math or lookup tables - simplifies firmware and reduces MCU resource usage |
| Wafer-level trimming | Ensures ±1.2°F accuracy at 77°F without post-assembly calibration - cuts test time and cost in volume production |
| Low self-heating (0.18°F) | Enables accurate surface-mount measurement on PCBs without thermal decoupling hardware or compensation algorithms |
| Single-supply operation | Operates from 4 V - compatible with Li-ion, alkaline, and regulated 5 V rails without negative supply generation |
| Hermetic-grade stability | ±0.16°F long-term drift after 1000 hrs at TMAX - supports 10+ year deployments in unattended equipment |
Applications
| Refrigeration Monitoring | Residential HVAC Control |
|---|---|
Use Scenario: Real-time temperature tracking inside refrigerator/freezer compartments for defrost cycle triggering and energy optimization. IC Role / Device Role / Timing Role: Analog temperature transducer converting thermal gradient into proportional voltage for microcontroller ADC sampling every 5 seconds. Use Value: ±1.2°F accuracy at 32–40°F ensures precise frost detection without false triggers; TO-92 form factor allows direct epoxy mounting to evaporator tubing. |
Use Scenario: Ambient air temperature feedback in wall-mounted thermostats for compressor/fan staging logic. IC Role / Device Role / Timing Role: Primary ambient sensor feeding closed-loop PID controller; outputs linear 320–2120 mV signal across 32–212°F range. Use Value: 10 mV/°F scaling enables direct mapping to 12-bit ADC values (e.g., 1024 = 102.4°F); low 75 µA draw extends battery life in wireless thermostats. |
| Food Safety Logging | Industrial Oven Monitoring |
Use Scenario: Portable temperature logger verifying cold chain integrity during transport of perishable pharmaceuticals. IC Role / Device Role / Timing Role: Core sensing element in battery-powered data logger; sampled at 1 Hz and stored with timestamp. Use Value: +32°F to +212°F range covers refrigerated, ambient, and warm-hold conditions; ±1.8°F max error meets FDA 21 CFR Part 11 traceability requirements. |
Use Scenario: In-chamber temperature verification in batch ovens used for PCB reflow preheating and curing processes. IC Role / Device Role / Timing Role: Secondary sensor validating primary thermocouple readings; mounted on insulated bracket near product zone. Use Value: Low self-heating (<0.18°F) prevents measurement bias in still-air environments; TO-92 package withstands 212°F continuous exposure per spec. |
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 | Wider range (−40°F to +230°F), ±1.6°F accuracy at TMAX, same TO-92 package and pinout | Required for freezer-to-oven applications; higher TMIN tolerance enables cold-room deployment | Select when operating below +32°F or above +212°F is needed; identical layout and firmware compatibility |
| LM35DZ/NOPB | Centigrade output (10 mV/°C), −40°C to +110°C range, ±0.5°C accuracy at 25°C, same TO-92 package | Used where Celsius-based control logic or international standards (IEC 60751) apply; requires °C-to-°F conversion in firmware | Choose for global OEM designs requiring dual-unit support or alignment with metric-based regulatory testing |
Compared with LM34CZ/NOPB, LM34DZ/LFT7 trades extended temperature coverage for tighter accuracy within its defined +32°F to +212°F window; compared with LM35DZ/NOPB, it eliminates firmware conversion overhead but locks the system to Fahrenheit-native processing.
Availability
LM34DZ/LFT7 is available at Aetrix Electronics and suitable for HVAC control systems, food safety data loggers, and residential appliance thermal monitoring requiring stable component supply, RoHS-compliant packaging, and long-lifecycle availability.
Supply support for LM34DZ/LFT7 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 ICs and sensor solutions.
The LM34 series was designed specifically for direct Fahrenheit temperature measurement in cost-sensitive industrial, appliance, and environmental monitoring applications - prioritizing simplicity, wafer-level calibration, and single-supply usability.
FAQ
What is the guaranteed accuracy of LM34DZ/LFT7 across its full operating range?
The LM34DZ/LFT7 is specified for ±1.8°F accuracy at both TMIN (+32°F) and TMAX (+212°F), and ±1.2°F at 77°F. These values are production-tested limits per TI's SNIS161D datasheet Rev D, Section 6.6. Accuracy degrades linearly between these points, with nonlinearity contributing ≤±0.6°F typical error. The LM34DZ/LFT7 does not require external calibration to meet these specs.
Can LM34DZ/LFT7 be used with a 3.3 V microcontroller ADC without level shifting?
Yes - at +212°F, LM34DZ/LFT7 outputs 2120 mV, well within the 3.3 V (3300 mV) input range of most 3.3 V ADCs. With proper decoupling and routing, the LM34DZ/LFT7's low output impedance (0.4 Ω) ensures minimal loading error. No level-shifting circuitry is needed, though a 0.1 µF capacitor from VOUT to GND is recommended for noise immunity in noisy environments.
Is LM34DZ/LFT7 pin-compatible with other LM34 variants in TO-92 package?
Yes - LM34DZ/LFT7 shares identical LP (TO-92) pinout with LM34CZ/NOPB and LM34CAZ/NOPB: Pin 1 = VOUT, Pin 2 = GND, Pin 3 = +VS. All use bottom-view orientation per datasheet Figure 5. This allows drop-in replacement in existing layouts when upgrading or qualifying alternatives, provided the operating temperature range remains within +32°F to +212°F.
Does LM34DZ/LFT7 require a minimum load to maintain accuracy?
No - the LM34DZ/LFT7 is specified down to zero load (IL = 0 µA). Its output stage is designed to source up to 1 mA while maintaining linearity and regulation. Load regulation is ±0.4 mV/mA typical, so even open-circuit operation yields full accuracy. However, a 10 kΩ pull-down resistor is recommended for noise immunity when interfacing to high-impedance inputs.
What thermal considerations apply when mounting LM34DZ/LFT7 on a PCB?
Mount LM34DZ/LFT7 with leads soldered directly to copper pour or thermal pads to minimize self-heating effects. Avoid placing near heat sources (e.g., regulators, power inductors). For surface-temperature measurement, epoxy the TO-92 body to the target surface and insulate leads - per TI Layout Guidelines (Section 10.1), this achieves ≤0.02°F error vs. surface temp. The LM34DZ/LFT7's 324°F/W junction-to-ambient thermal resistance in still air must be factored into enclosure thermal modeling.
LM34DZ/LFT7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Tape & Reel (TR)
- 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):
- ±1°F (±2°F)
- Test Condition:
- 77°F (230°F)
- Operating Temperature:
- 0°C ~ 100°C
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- TO-92-3
LM34DZ/LFT7 FAQ
1.How can I place an order for LM34DZ/LFT7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34DZ/LFT7 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 LM34DZ/LFT7 reliable?
The price and inventory of LM34DZ/LFT7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34DZ/LFT7 is usually 5 days.
3.What payment methods are accepted for LM34DZ/LFT7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34DZ/LFT7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34DZ/LFT7?
LM34DZ/LFT7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34DZ/LFT7 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 LM34DZ/LFT7?
For technical support, including LM34DZ/LFT7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34DZ/LFT7 requirements.
6.How does Aetrix verify that LM34DZ/LFT7 is sourced from the original manufacturer or authorized distributors?
All LM34DZ/LFT7 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 LM34DZ/LFT7 meets industry standards.
7.What is the process for return or replacement of LM34DZ/LFT7?
All LM34DZ/LFT7 units undergo pre-shipment inspection (PSI). If there is an issue with LM34DZ/LFT7, 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 LM34DZ/LFT7 part is unused and in its original packaging.
Return procedure for LM34DZ/LFT7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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