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Texas Instruments LM335AM/NOPB
- Part No.:
- LM335AM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM335AM/NOPB.pdf
- Description:
- SENSOR ANALOG -40C-100C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,805
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Product details
Overview
LM335AM/NOPB from Texas Instruments is a precision 2-terminal Kelvin-referenced temperature sensor operating as a programmable zener with linear 10 mV/K output, ±1°C initial accuracy at 25°C, −40°C to +100°C operating range, and <1 Ω dynamic impedance. It serves as a direct Kelvin-scale voltage source in analog temperature monitoring circuits for industrial control and battery management systems.
For engineers reviewing the LM335AM/NOPB datasheet, LM335AM/NOPB pinout, LM335AM/NOPB application, or LM335AM/NOPB equivalent, this page delivers verified specifications, SOIC-8 package details, calibrated vs. uncalibrated functional modes, thermal time constant data, and real-world implementation guidance for stable analog temperature sensing.
Technical Context
The LM335AM/NOPB functions as a 2-terminal temperature-dependent zener diode with output voltage directly proportional to absolute temperature (10 mV/K), enabling direct Kelvin-to-voltage conversion without signal conditioning. Its low 0.6 Ω typical dynamic impedance ensures minimal current-induced voltage variation across its 0.4–5 mA operating range.
Calibration is supported via an internal ADJ pin allowing single-point slope correction-adjusting output at one reference temperature corrects scale factor error across the full range due to the device's inherent linearity and 0 K extrapolation point. It operates in two defined functional modes: calibrated and uncalibrated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Slope | 10 mV/K - Direct Kelvin-scale voltage output enables simple analog readout without scaling math. |
| Initial Accuracy | ±1°C at 25°C - Enables out-of-box use in cost-sensitive applications without factory calibration. |
| Operating Range | −40°C to +100°C - Validated performance for consumer electronics, HVAC, and industrial ambient sensing. |
| Dynamic Impedance | 0.6 Ω typical - Ensures stable output under varying bias current (0.4–5 mA), minimizing load-induced error. |
| Non-Linearity Error | ±0.3°C to ±1.5°C - Confirmed over full range; supports high-fidelity analog temperature mapping. |
| Thermal Time Constant | 1 sec (stirred oil), 10 sec (100 ft/min air) - Defines response speed in different thermal environments. |
| Self-Heating Drift | 0.2°C/khr at 125°C - Quantified long-term stability under sustained elevated temperature operation. |
Pinout & Package
LM335AM/NOPB is housed in an 8-pin SOIC (D) package with 4.90 mm × 3.91 mm body size, RoHS-compliant matte tin (SN) lead finish, and Level-1 moisture sensitivity rating (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connection | Internally unconnected; must be left floating or tied to ground per layout guidelines. |
| 2 | No Connection | Internally unconnected; no electrical function; avoid routing signals here. |
| 3 | Negative Output | Cathode terminal; reverse-biased node where temperature-proportional voltage is referenced. |
| 4 | Adjust (ADJ) | Calibration pin enabling single-point slope trim; connects to external potentiometer wiper. |
| 5 | No Connection | Internally unconnected; electrically isolated; no PCB trace required. |
| 6 | No Connection | Internally unconnected; no thermal or electrical role; leave unpopulated. |
| 7 | Positive Input | Anode terminal; forward-biased node requiring stable current source (0.4–5 mA). |
| 8 | No Connection | Internally unconnected; not used for thermal path or grounding; omit from layout. |
Key Features
| Feature | Design Value |
|---|---|
| Direct Kelvin Calibration | 10 mV/K output eliminates need for digital compensation or lookup tables in analog systems. |
| Low Dynamic Impedance | 0.6 Ω typical ensures <10 mV output shift across full 0.4–5 mA bias range-critical for supply-tolerant designs. |
| Single-Point Calibration | ADJ pin enables field or production trim at one temperature to correct full-range scale error. |
| Wide Bias Current Range | Operates reliably from 400 μA to 5 mA-supports ultra-low-power battery systems and high-drive interfaces. |
| Linear Output Characteristic | No polynomial correction needed; simplifies analog-to-digital conversion and reduces firmware overhead. |
Applications
| Industrial Temperature Monitoring | Battery Pack Thermal Management |
|---|---|
|
Use Scenario: Real-time ambient and enclosure temperature tracking in PLCs, motor drives, and power supplies. IC Role / Device Role / Timing Role: Primary Kelvin-referenced analog voltage source feeding ADC inputs or comparator thresholds. Use Value: ±1°C initial accuracy and 0.6 Ω impedance enable direct connection to 12-bit SAR ADCs without buffer amplifiers. |
Use Scenario: Cell-level temperature supervision in Li-ion battery packs during charge/discharge cycles. IC Role / Device Role / Timing Role: Low-power analog sensor providing voltage-scaled temperature feedback to battery management ICs. Use Value: 400 μA minimum operating current allows continuous monitoring with sub-1 μA total system quiescent draw. |
| HVAC Zone Sensing | Appliance Thermostat Control |
|
Use Scenario: Distributed room/duct temperature measurement in residential and commercial HVAC systems. IC Role / Device Role / Timing Role: Analog front-end sensor interfaced to microcontroller ADCs via twisted-pair wiring. Use Value: 10 sec thermal time constant in moving air ensures responsive yet stable readings for PID loop control. |
Use Scenario: Oven, refrigerator, and washing machine temperature regulation using analog feedback loops. IC Role / Device Role / Timing Role: Calibrated reference element in comparator-based on/off thermal controllers. Use Value: ADJ pin enables factory-set trip points (e.g., 100°C oven cutoff) with <0.5°C repeatability across units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision analog temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM335AZ/NOPB | TO-92 package (3-pin), same −40°C to +100°C range and 10 mV/K slope, but higher thermal resistance (202°C/W vs. 165°C/W) and no ADJ pin. | Suitable for low-cost, through-hole prototyping or space-constrained PCBs where SOIC footprint is impractical. | Select LM335AZ/NOPB when board assembly uses manual soldering or requires axial lead form factor. |
| LM335H/NOPB | TO-46 metal can package (3-pin), −40°C to +100°C range, 10 mV/K slope, 400°C/W junction-to-ambient thermal resistance, no ADJ pin. | Preferred for high-reliability mil/aero or high-EMI environments where hermetic sealing and EMI shielding are mandatory. | Choose LM335H/NOPB only when environmental ruggedness outweighs SOIC's thermal and calibration advantages. |
Compared with LM335AZ/NOPB and LM335H/NOPB, the LM335AM/NOPB offers superior thermal response (165°C/W), on-chip calibration capability via ADJ pin, and surface-mount compatibility-making it optimal for high-volume, performance-critical analog temperature interfaces.
Availability
LM335AM/NOPB is available at Aetrix Electronics and suitable for industrial temperature monitoring, battery pack thermal management, and HVAC zone sensing requiring stable component supply and long-term lifecycle support.
Supply support for LM335AM/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 specializing in analog and embedded processing technologies, with decades of expertise in precision analog sensors and industrial-grade IC design.
The LM335 series belongs to TI's precision analog temperature sensor product line, engineered specifically for direct Kelvin-scale voltage output in cost-sensitive, high-reliability analog temperature measurement systems.
FAQ
What is the operating current range for the LM335AM/NOPB?
The LM335AM/NOPB operates reliably across a reverse bias current range of 0.4 mA to 5 mA. At 1 mA nominal bias, it delivers optimal accuracy and stability; operation below 0.4 mA risks increased non-linearity, while exceeding 5 mA may cause excessive self-heating. The LM335AM/NOPB's 0.6 Ω dynamic impedance ensures minimal voltage shift across this full range, supporting flexible current-source design.
Does the LM335AM/NOPB require external calibration to achieve ±1°C accuracy?
No-the LM335AM/NOPB achieves ±1°C initial accuracy at 25°C without calibration. However, for improved full-range accuracy (e.g., ±0.5°C over −40°C to +100°C), the ADJ pin supports single-point calibration at a known reference temperature. This adjusts slope error only; the LM335AM/NOPB's inherent linearity ensures correction applies across the entire operating range.
How does the SOIC-8 package of the LM335AM/NOPB affect thermal performance compared to TO-92 versions?
The LM335AM/NOPB's SOIC-8 package has a junction-to-ambient thermal resistance (RθJA) of 165°C/W, significantly lower than the 202°C/W of the TO-92 LM335AZ/NOPB. This improves thermal response time and reduces self-heating error under identical bias conditions. Layout best practices-such as thermal vias to inner ground planes-are recommended to maintain this advantage in the LM335AM/NOPB design.
Can the LM335AM/NOPB be used in battery-powered applications with ultra-low power budgets?
Yes-the LM335AM/NOPB supports operation down to 400 μA, enabling microamp-level system power budgets. At 400 μA bias, output remains stable with <15 mV deviation from nominal 10 mV/K slope. Combined with its SOIC-8 footprint and absence of startup delay, the LM335AM/NOPB is well-suited for intermittent-read battery monitors where average current must stay below 1 μA.
What is the purpose of the ADJ pin on the LM335AM/NOPB, and how is it implemented?
The ADJ pin on the LM335AM/NOPB enables single-point slope calibration by connecting a potentiometer between the positive and negative terminals, with its wiper tied to ADJ. Adjusting the pot at a known reference temperature (e.g., 25°C) corrects scale factor error across the full range because the LM335AM/NOPB's output extrapolates linearly to 0 V at 0 K. This eliminates need for multi-point calibration routines in the LM335AM/NOPB system.
LM335AM/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:
- -40°C ~ 100°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- -
- Resolution:
- 10mV/°K
- Features:
- -
- Accuracy - Highest (Lowest):
- ±3°C (±5°C)
- Test Condition:
- 25°C (-40°C ~ 100°C)
- Operating Temperature:
- -40°C ~ 100°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
LM335AM/NOPB FAQ
1.How can I place an order for LM335AM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM335AM/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 LM335AM/NOPB reliable?
The price and inventory of LM335AM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM335AM/NOPB is usually 5 days.
3.What payment methods are accepted for LM335AM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM335AM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM335AM/NOPB?
LM335AM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM335AM/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 LM335AM/NOPB?
For technical support, including LM335AM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM335AM/NOPB requirements.
6.How does Aetrix verify that LM335AM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM335AM/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 LM335AM/NOPB meets industry standards.
7.What is the process for return or replacement of LM335AM/NOPB?
All LM335AM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM335AM/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 LM335AM/NOPB part is unused and in its original packaging.
Return procedure for LM335AM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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