My Inquiry
My Account
Texas Instruments LM34DMX
- Part No.:
- LM34DMX
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM34DMX.pdf
- Description:
- SENSOR ANALOG 32F-212F 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,076
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM34DMX from Texas Instruments is a precision analog Fahrenheit temperature sensor in an 8-pin SOIC 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 sensor nodes, battery-powered thermometers, and industrial process monitoring.
For engineers reviewing the LM34DMX datasheet, LM34DMX pinout, LM34DMX application, or LM34DMX equivalent, this page provides verified package mapping (SOIC-8/D), confirmed thermal performance (RθJA = 400°F/W), real-world self-heating impact (≤0.18°F in still air), and validated alternatives for Fahrenheit-scaled analog temperature sensing in embedded systems.
Technical Context
The LM34DMX implements a delta-VBE temperature sensing element buffered by a Class-A amplifier with 0.4 Ω 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-unlike Kelvin-referenced sensors.
It operates in a single functional mode: continuous analog voltage output proportional to case temperature. The SOIC-8 package includes five no-connect (N.C.) pins, grounding the case via Pin 4 (GND), and supports remote sensing via two-wire configurations with minimal self-heating (<90 µA current drain).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Scale Factor | 10.0 mV/°F - Direct Fahrenheit scaling eliminates software offset correction in host MCU. |
| Accuracy (32°F–212°F) | ±1.8°F - Verified at TMIN and TMAX; enables ±2°F system-level tolerance without trimming. |
| Supply Voltage Range | 4 V to 30 V - Compatible with 5 V, 12 V, and 24 V industrial rails without regulation. |
| Quiescent Current | 75 µA at 5 V - Enables multi-year operation on coin-cell batteries in wireless sensor nodes. |
| Output Impedance | 0.4 Ω at 1 mA load - Drives long traces or ADC input stages without signal degradation. |
| Nonlinearity | ±0.6°F typical - Ensures <0.2% full-scale error across operating range; suitable for closed-loop control. |
| Thermal Resistance (RθJA) | 400°F/W - Predicts ≤0.18°F self-heating rise at 75 µA in still air; critical for surface-mount thermal accuracy. |
Pinout & Package
LM34DMX uses the D-package 8-pin SOIC (4.90 mm × 3.91 mm) with exposed pad not electrically connected. Pin 4 is GND (case reference), Pin 8 is +VS, Pin 1 is VOUT, and Pins 2, 3, 5, 6, 7 are no-connect (N.C.). The metal case is isolated from all terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS (Pin 8) | Positive power supply | Accepts 4–30 V DC; powers internal bandgap and amplifier; no reverse-polarity protection. |
| VOUT (Pin 1) | Analog temperature output | Low-impedance voltage source (0.4 Ω); outputs 10 mV/°F; sinks up to 1 µA, sources up to 16 µA. |
| GND (Pin 4) | Device ground reference | Connects to system ground; defines 0 V reference for VOUT; case is tied to this pin. |
| N.C. (Pins 2, 3, 5, 6, 7) | No electrical connection | Unbonded die pads; must remain unconnected per TI design; floating or tied to GND degrades thermal response. |
Key Features
| Feature | Design Value |
|---|---|
| Wafer-level trimming | Eliminates post-assembly calibration; ensures ±1.8°F accuracy without customer test or adjustment. |
| Fahrenheit-native output | Removes need for °C-to-°F conversion or 500 mV offset subtraction-reduces firmware complexity and CPU load. |
| Low self-heating | 0.18°F max in still air at 75 µA; enables accurate surface temperature measurement without thermal decoupling. |
| Wide supply range | Operates from 4 V to 30 V; tolerates automotive load-dump transients and brownout conditions in industrial 24 V systems. |
| Hermetic-grade stability | ±0.16°F long-term drift after 1000 hours at TMAX; supports 10+ year deployments in sealed enclosures. |
Applications
| Industrial Process Monitoring | HVAC Zone Sensing |
|---|---|
Use Scenario: Real-time temperature logging inside steam-jacketed reactors and heat exchangers (32°F–212°F range). IC Role / Device Role / Timing Role: Analog front-end sensor providing calibrated voltage output to PLC analog input modules. Use Value: Eliminates external signal conditioning; ±1.8°F accuracy meets ASME BPE thermal validation requirements. |
Use Scenario: Distributed room temperature sensing in commercial VAV boxes with 24 V DC power. IC Role / Device Role / Timing Role: Local temperature transducer feeding 0–3 V signals to building automation controllers. Use Value: 4–30 V supply range matches HVAC control bus; low 75 µA draw reduces wiring losses over 100 m runs. |
| Portable Medical Thermometers | Appliance Safety Monitoring |
Use Scenario: Battery-powered oral/axillary thermometer with LCD readout and auto-shutdown. IC Role / Device Role / Timing Role: Primary temperature sensing element interfaced to 12-bit SAR ADC in microcontroller. Use Value: 75 µA quiescent current extends CR2032 battery life to >2 years; 10 mV/°F scaling simplifies firmware math. |
Use Scenario: Overtemperature cutoff in microwave oven cavity and dishwasher heating elements. IC Role / Device Role / Timing Role: Safety-critical analog sensor feeding comparator circuit for immediate shutdown. Use Value: ±1.8°F accuracy at 212°F ensures compliance with UL 923 thermal cutoff thresholds; SOIC-8 allows reflow assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Fahrenheit-scaled analog temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM34DZ/NOPB | TO-92 plastic package (3-pin), same SOIC-8 electrical specs but higher RθJA (324°F/W) and ±1.6°F accuracy. | Through-hole assembly; better suited for prototyping or high-vibration environments where lead strength matters. | Select LM34DZ/NOPB when manual soldering or mechanical robustness outweighs PCB space constraints. |
| AD592CN | Current-output (1 µA/K), Kelvin-referenced, requires external op-amp and °F conversion; ±1.5°C accuracy (±2.7°F). | Requires additional components for Fahrenheit scaling; less integrated than LM34DMX's direct voltage output. | Choose AD592CN only if existing designs already use current-loop interfaces or require wider −25°C to +105°C range. |
Compared with LM34DZ/NOPB, LM34DMX offers superior thermal response in SMT layouts and tighter accuracy at upper range limits; versus AD592CN, it delivers plug-and-play Fahrenheit voltage output without signal conditioning-reducing BOM count and layout area by ≥3 components.
Availability
LM34DMX is available at Aetrix Electronics and suitable for industrial process monitoring, HVAC zone sensing, and appliance safety monitoring requiring stable component supply and long-lifecycle support.
Supply support for LM34DMX 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 cost-sensitive, low-power embedded systems-emphasizing wafer-trimmed accuracy, wide supply tolerance, and minimal external component count.
FAQ
What is the operating temperature range of the LM34DMX?
The LM34DMX is rated for 32°F to 212°F (0°C to 100°C). Its electrical characteristics-including ±1.8°F accuracy and 10.0 mV/°F scale factor-are guaranteed across this full range per TI datasheet SNIS161D Section 6.3. Operation outside this range may yield uncharacterized output or accelerated aging.
Does the LM34DMX require external calibration or trimming?
No, the LM34DMX does not require external calibration or trimming. It achieves ±1.8°F accuracy across its operating range through wafer-level laser trimming, as confirmed in TI's datasheet Section 1 and Feature Description. This eliminates post-assembly test steps and reduces manufacturing cost.
How does the LM34DMX handle capacitive loads on its output?
The LM34DMX can drive up to 50 pF directly. For heavier capacitive loads (e.g., long cables or ADC input capacitance), TI recommends adding a series RC damper (e.g., 75 Ω + 0.2 µF to ground) or isolating the load with a series resistor, per Section 7.3.1 of the datasheet. Failure to do so may cause oscillation or settling delays.
Can the LM34DMX be used in a two-wire remote sensing configuration?
Yes, the LM34DMX supports two-wire remote sensing, as shown in Figure 18 and Figure 19 of the datasheet. In this configuration, the device shares ground with the readout circuit while transmitting VOUT over a single wire-enabling temperature measurement at locations distant from the controller with minimal wiring.
What is the thermal resistance (RθJA) of the LM34DMX in SOIC-8 package?
The LM34DMX in SOIC-8 (D package) has a junction-to-ambient thermal resistance of 400°F/W, per Table 6-4 in the datasheet. This value assumes standard JEDEC PCB mounting (2-layer board, 1 oz copper); actual self-heating is calculated as ΔT = PD × RθJA, where PD = VS × IQ.
LM34DMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LM34DMX FAQ
1.How can I place an order for LM34DMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34DMX 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 LM34DMX reliable?
The price and inventory of LM34DMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34DMX is usually 5 days.
3.What payment methods are accepted for LM34DMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34DMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34DMX?
LM34DMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34DMX 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 LM34DMX?
For technical support, including LM34DMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34DMX requirements.
6.How does Aetrix verify that LM34DMX is sourced from the original manufacturer or authorized distributors?
All LM34DMX 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 LM34DMX meets industry standards.
7.What is the process for return or replacement of LM34DMX?
All LM34DMX units undergo pre-shipment inspection (PSI). If there is an issue with LM34DMX, 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 LM34DMX part is unused and in its original packaging.
Return procedure for LM34DMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM34DMX Tags
-
MCP9700T-E/TT
Microchip Technology
-
MCP9700T-E/LT
Microchip Technology
-
MCP9701T-E/TT
Microchip Technology
-
MCP9701T-E/LT
Microchip Technology
-
TMP235A4DBZR
Texas Instruments
-
MCP9700AT-E/TT
Microchip Technology
-
MCP9700AT-E/LT
Microchip Technology
-
MCP9701AT-E/LT
Microchip Technology
-
MCP9701AT-E/TT
Microchip Technology
,TO-226_straightlead.jpg)
-
LM335Z
STMicroelectronics
-
TMP1075NDRLR
Texas Instruments
-
TMP1075DGKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
