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Texas Instruments LM335AM
- Part No.:
- LM335AM
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM335AM.pdf
- Description:
- SENSOR ANALOG -40C-100C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:171
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Product details
Overview
LM335AM from Texas Instruments is a precision 2-terminal Kelvin-referenced temperature sensor operating as a zener-mode IC 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 delivers calibrated analog voltage proportional to absolute temperature for direct interface with ADCs or op-amp conditioning circuits in industrial monitoring systems.
For engineers reviewing the LM335AM datasheet, LM335AM pinout, LM335AM application, or LM335AM equivalent, this page provides verified package mapping (SOIC-8), calibrated error performance (±1°C at 25°C, ±2°C over full range), thermal time constant (1 sec in stirred oil), ADJ-pin calibration capability, and validated alternatives for temperature-sensing designs requiring traceable sourcing and long-term supply continuity.
Technical Context
The LM335AM implements a bandgap-referenced zener structure optimized for absolute temperature sensing, with output voltage directly proportional to Kelvin temperature (10 mV/°K). Its low 0.6 Ω typical dynamic impedance ensures stable operation across 400 μA–5 mA bias current without gain drift.
Calibration is performed via the ADJ pin using a single-point trim at 25°C, correcting slope errors across the full −40°C to +100°C range. The device operates in two functional modes-uncalibrated (±2°C max error) and calibrated (±1°C max error)-with no internal power supply or digital logic required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Range | −40°C to +100°C continuous operation; supports HVAC, battery management, and industrial control environments. |
| Output Sensitivity | 10 mV/°K (2.982 V at 25°C); enables direct Kelvin-to-voltage conversion without signal conditioning. |
| Initial Accuracy | ±1°C at 25°C (LM335A grade); reduces system-level calibration burden in production test. |
| Dynamic Impedance | 0.6 Ω typical; maintains output stability under varying load or supply conditions. |
| Bias Current Range | 400 μA to 5 mA; allows low-power operation while preserving linearity and noise immunity. |
| Thermal Time Constant | 1 sec in stirred oil; enables rapid response in closed-loop thermal regulation applications. |
| Non-Linearity Error | ±0.3°C typical; ensures monotonic output across full range for high-fidelity temperature logging. |
Pinout & Package
LM335AM is housed in an 8-pin SOIC (D) package with 4.90 mm × 3.91 mm body size, RoHS-compliant Sn lead finish, and Level-1 MSL rating (260°C reflow compatible). Pin 1 is marked with a dot; pins 2–7 are internally connected or unused per TI's functional mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Positive Input (+) | Main anode terminal; connects to bias resistor and supply rail for reverse-biased zener operation. |
| 2 | No Connection (N.C.) | Internally unconnected; must remain floating or tied to ground only if required by layout thermal isolation. |
| 3 | No Connection (N.C.) | Internally unconnected; no electrical function; avoid routing signals or power near this pin. |
| 4 | Negative Output (−) | Cathode terminal; provides Kelvin-proportional voltage referenced to system ground. |
| 5 | ADJ | Calibration adjust pin; accepts external potentiometer for 1-point slope correction at 25°C. |
| 6 | No Connection (N.C.) | Internally unconnected; no bond wire or die connection; treat as open circuit. |
| 7 | No Connection (N.C.) | Internally unconnected; no functional role; do not tie to any net. |
| 8 | Positive Input (+) | Duplicate anode terminal; electrically identical to Pin 1; used for dual-side PCB routing flexibility. |
Key Features
| Feature | Design Value |
|---|---|
| Direct Kelvin calibration | 10 mV/°K output eliminates need for offset/gain scaling in microcontroller firmware or analog front-end design. |
| Single-point ADJ calibration | Enables full-range accuracy correction using one trim at 25°C, reducing factory calibration time and cost. |
| Low dynamic impedance | 0.6 Ω typical ensures minimal voltage droop under load variations, critical for multi-sensor shared-bus configurations. |
| Wide bias current range | 400 μA–5 mA operation supports both ultra-low-power battery systems and high-stability industrial supplies. |
| Hermetic SOIC packaging | SOIC-8 body with moisture-sensitive level 1 rating enables standard SMT assembly without baking requirements. |
Applications
| Industrial Temperature Monitoring | Battery Pack Thermal Management |
|---|---|
|
Use Scenario: Real-time ambient and enclosure temperature tracking in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Analog voltage-output temperature transducer interfaced to 12-bit SAR ADCs for closed-loop thermal derating. Use Value: ±1°C accuracy at 25°C and <1 Ω impedance enable sub-degree resolution without external amplification or filtering. |
Use Scenario: Cell-level temperature sensing in 12S Li-ion battery packs for charge/discharge safety cutoff. IC Role / Device Role / Timing Role: Kelvin-referenced analog sensor providing voltage proportional to absolute temperature for BMS microcontroller input. Use Value: 10 mV/°K scaling simplifies firmware math; SOIC-8 footprint allows dense placement near cells with minimal thermal coupling error. |
| HVAC Zone Control Systems | Appliance Overtemperature Protection |
|
Use Scenario: Room air temperature feedback in smart thermostats and duct-mounted climate controllers. IC Role / Device Role / Timing Role: Primary temperature reference in analog comparator-based on/off control loops or PID controller inputs. Use Value: Linear output and low self-heating (<0.1°C at 1 mA) ensure stable setpoint tracking without software compensation. |
Use Scenario: Cooktop surface and oven cavity temperature supervision in UL-certified kitchen appliances. IC Role / Device Role / Timing Role: Safety-critical analog sensor feeding into hardware watchdog comparators for immediate shutdown on overtemp. Use Value: −40°C to +100°C range covers full appliance operational envelope; SOIC package withstands reflow and long-term thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature-sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM335AZ/NOPB | TO-92 plastic package (3-pin), same −40°C to +100°C range and 10 mV/°K sensitivity, but ±2°C uncalibrated accuracy vs. ±1°C for LM335AM. | Suitable for cost-sensitive, low-density PCBs where through-hole assembly or manual calibration is acceptable. | Select LM335AZ/NOPB when board space is unconstrained and TO-92 mounting simplifies thermal coupling to heatsinks or enclosures. |
| LM335H/NOPB | TO-46 hermetic metal can (3-pin), −40°C to +100°C range, same 10 mV/°K output, but higher thermal mass and ±2°C uncalibrated accuracy. | Preferred for aerospace or high-reliability mil-spec applications requiring hermetic sealing and extended lifetime under thermal shock. | Choose LM335H/NOPB only when environmental ruggedness (e.g., humidity, vibration, outgassing) outweighs SOIC-8 assembly efficiency. |
Compared with LM335AZ/NOPB and LM335H/NOPB, the LM335AM offers superior accuracy (±1°C vs. ±2°C), automated SMT compatibility via SOIC-8, and lower thermal time constant-making it optimal for high-volume industrial electronics where calibration yield and production throughput matter.
Availability
LM335AM is available at Aetrix Electronics and suitable for industrial temperature monitoring, battery pack thermal management, and HVAC zone control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for LM335AM 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 ICs.
The LM335AM belongs to TI's LMx35 family of Kelvin-calibrated temperature sensors, designed specifically for high-accuracy, low-drift analog temperature measurement in harsh industrial and automotive-adjacent environments.
FAQ
What is the operating temperature range of the LM335AM?
The LM335AM operates continuously from −40°C to +100°C, with intermittent capability up to +125°C. This range is validated per TI's SNIS160E datasheet and supports deployment in industrial enclosures, battery packs, and HVAC ducts without derating. The LM335AM maintains specified accuracy and dynamic impedance across this full span when biased within 400 μA–5 mA.
How does the ADJ pin on the LM335AM enable calibration?
The ADJ pin on the LM335AM allows single-point slope calibration at 25°C using an external potentiometer, correcting scale-factor errors across the entire −40°C to +100°C range. As described in TI's datasheet Section 7.3.1, this works because the LM335AM's output is linearly proportional to absolute temperature (10 mV/°K), so adjusting at one point corrects all temperatures. The LM335AM's ADJ functionality is identical to that of the LM135/LM235 series.
What package type is used for the LM335AM, and what are its key mechanical attributes?
The LM335AM uses an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with RoHS-compliant Sn lead finish and Level-1 MSL rating (260°C reflow compatible). Unlike TO-92 or TO-46 variants, the SOIC-8 body enables automated SMT placement, improved thermal dissipation via exposed pad options (not present on standard D package), and higher board density-critical for compact industrial control modules.
Can the LM335AM be used in battery-powered applications?
Yes, the LM335AM supports battery-powered operation down to 400 μA bias current while maintaining linearity and <1 Ω dynamic impedance. At 400 μA, self-heating remains below 0.05°C, preserving accuracy in portable instrumentation or wireless sensor nodes. Its 10 mV/°K output also minimizes ADC resolution loss compared to millivolt-range thermistors, making the LM335AM especially effective in low-power, high-accuracy temperature logging.
What is the dynamic impedance specification for the LM335AM, and why does it matter?
The LM335AM has a typical dynamic impedance of 0.6 Ω, measured at 1 mA bias current. This low value ensures minimal output voltage variation under changing load conditions-critical when driving ADC input capacitors, long PCB traces, or multiple parallel sensors. In contrast, higher-impedance sensors (e.g., thermistors >1 kΩ) require buffering, adding cost and error sources. The LM335AM's 0.6 Ω impedance directly enables direct connection to precision SAR ADCs.
LM335AM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Last Time Buy
- 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 FAQ
1.How can I place an order for LM335AM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM335AM 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 reliable?
The price and inventory of LM335AM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM335AM is usually 5 days.
3.What payment methods are accepted for LM335AM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM335AM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM335AM?
LM335AM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM335AM 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?
For technical support, including LM335AM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM335AM requirements.
6.How does Aetrix verify that LM335AM is sourced from the original manufacturer or authorized distributors?
All LM335AM 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 meets industry standards.
7.What is the process for return or replacement of LM335AM?
All LM335AM units undergo pre-shipment inspection (PSI). If there is an issue with LM335AM, 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 part is unused and in its original packaging.
Return procedure for LM335AM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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