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Texas Instruments LM335AH
- Part No.:
- LM335AH
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
LM335AH.pdf
- Description:
- SENSOR ANALOG -40C-100C TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,616
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Product details
Overview
LM335AH 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 serves as a calibrated analog voltage source in thermal monitoring circuits for industrial power supplies and battery management systems.
For engineers reviewing the LM335AH datasheet, LM335AH pinout, LM335AH application, or LM335AH equivalent, this page delivers verified specifications, TO-46 package details, calibration methodology, real-world use cases, and validated alternative parts - all confirmed against TI's SNIS160E datasheet and official orderable addendum.
Technical Context
The LM335AH functions as a two-terminal temperature-dependent zener diode, generating an output voltage directly proportional to absolute temperature (10 mV/K), with no internal amplification or digital interface. Its operation requires external bias current (400 μA–5 mA) and supports one-point calibration via the ADJ pin to correct slope error across the full range.
Unlike thermistors or digital sensors, the LM335AH delivers inherently linear analog output without signal conditioning, enabling direct ADC interfacing or simple op-amp scaling. Its low dynamic impedance (<1 Ω) ensures minimal voltage droop under load, and its TO-46 hermetic metal can package provides stable thermal response and long-term drift performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Slope | 10 mV/K - Direct Kelvin-scale linearity enables straightforward voltage-to-temperature conversion without lookup tables. |
| Initial Accuracy | ±1°C at 25°C - Specifies maximum uncalibrated error at reference point; enables rapid system-level qualification. |
| Operating Range | −40°C to +100°C - Defines ambient temperature limits for reliable forward-bias operation and specified accuracy. |
| Dynamic Impedance | 0.5 Ω typical - Ensures <1 mV output shift under 1 mA load variation, critical for stable reading in noisy environments. |
| Bias Current Range | 400 μA to 5 mA - Minimum current sustains regulation; maximum avoids self-heating beyond 1°C error at 100°C. |
| Calibration Support | ADJ pin enables 1-point slope trim - Corrects full-range error by adjusting output at single temperature (e.g., 25°C). |
| Thermal Time Constant | 1 sec in stirred oil - Indicates fast thermal response for dynamic temperature tracking in closed-loop control. |
Pinout & Package
LM335AH uses a hermetic TO-46 (NDV) metal-can package with 3 leads: Anode (positive terminal), Cathode (negative terminal), and ADJ (calibration adjust pin). The package provides superior moisture resistance and thermal stability versus plastic TO-92 variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (+) | Positive input / bias terminal | Connected to supply rail through current-limiting resistor; reverse-biased to establish zener conduction. |
| Cathode (−) | Negative output / reference terminal | Provides temperature-proportional voltage referenced to system ground; output measured between Anode and Cathode. |
| ADJ | Calibration adjustment terminal | Allows external potentiometer connection to trim output slope; enables correction of scale-factor error across full temperature range. |
Key Features
| Feature | Design Value |
|---|---|
| Direct Kelvin calibration | 10 mV/K output eliminates need for offset compensation or nonlinear math in firmware or analog circuitry. |
| Low dynamic impedance | 0.5 Ω typical ensures stable output under varying load conditions, reducing sensitivity to PCB trace resistance and noise coupling. |
| One-point calibration capability | ADJ pin enables field or production trim at 25°C to achieve ≤1°C error over entire −40°C to +100°C range. |
| Hermetic TO-46 packaging | Sealed metal can prevents moisture ingress and long-term parameter drift, supporting 15+ year deployments in industrial environments. |
| Wide bias current tolerance | Operates reliably from 400 μA to 5 mA - accommodates low-power sleep modes and high-speed readout without redesign. |
Applications
| Industrial Power Supply Monitoring | Battery Thermal Management |
|---|---|
Use Scenario: Real-time die temperature sensing inside AC/DC converters and DC/DC regulators to prevent thermal runaway during overload or ambient rise. IC Role / Device Role / Timing Role: Analog voltage source providing Kelvin-proportional feedback to supervisor IC or microcontroller ADC. Use Value: Enables immediate shutdown or derating at 95°C using simple comparator threshold, avoiding costly thermal shutdown ICs or complex digital interfaces. |
Use Scenario: Cell-pack temperature monitoring in Li-ion battery packs for charge termination, discharge limiting, and safety cutoff. IC Role / Device Role / Timing Role: Primary analog temperature transducer feeding into battery fuel gauge or protection ASIC. Use Value: Delivers ±1°C accuracy at 25°C and <2°C error across −20°C to +60°C cell operating range - sufficient for JEITA-compliant charging profiles. |
| HVAC Zone Sensing | Appliance Oven Control |
Use Scenario: Ambient air temperature measurement in duct-mounted HVAC controllers for zone-based heating/cooling modulation. IC Role / Device Role / Timing Role: Linear analog sensor interfaced directly to 12-bit SAR ADC in HVAC MCU, eliminating thermistor lookup tables. Use Value: Reduces BOM count by removing external signal conditioning; 10 mV/K slope allows direct register scaling (e.g., 298.2 mV = 25°C) in firmware. |
Use Scenario: Cavity temperature feedback in smart ovens and induction cooktops for precise PID-controlled cooking cycles. IC Role / Device Role / Timing Role: High-stability temperature reference mounted on heat-sink near heating element. Use Value: Hermetic TO-46 package withstands repeated thermal cycling up to 100°C; <1°C calibration drift over 5 years ensures consistent recipe execution. |
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 |
|---|---|---|---|
| LM335A | Same TO-46 package and 10 mV/K slope, but ±0.5°C initial accuracy at 25°C and tighter ±2°C full-range error vs. LM335AH's ±1°C/±5°C. | Preferred where higher factory accuracy reduces need for field calibration; same pinout and bias requirements. | Select LM335A when system-level calibration is impractical and tighter initial spec is required for pass/fail testing. |
| LM235AH | Identical TO-46 package and ADJ pin, but −40°C to +125°C range and ±2°C full-range error; optimized for wider industrial ambient. | Suitable for under-hood automotive or outdoor enclosures where ambient exceeds 100°C but sensor location stays below 125°C. | Choose LM235AH when operating environment exceeds 100°C but does not require LM335AH's lower-cost qualification path for consumer-grade thermal monitoring. |
Compared with LM335A and LM235AH, the LM335AH offers the best balance of cost, accuracy, and thermal range for fixed-location industrial equipment - delivering ±1°C at 25°C with proven long-term stability in hermetic TO-46 packaging, while avoiding the premium of LM335A or the extended-range overhead of LM235AH.
Availability
LM335AH is available at Aetrix Electronics and suitable for industrial power supplies, battery thermal management, and HVAC control systems requiring stable component supply, long-lifecycle support, and RoHS-compliant hermetic packaging.
Supply support for LM335AH 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 over 50 years of innovation in precision analog ICs and industrial-grade components.
The LM335AH belongs to TI's LMx35 series of precision Kelvin-referenced temperature sensors, designed specifically for analog-centric thermal monitoring in cost-sensitive, high-reliability industrial and automotive subsystems.
FAQ
What is the operating temperature range of the LM335AH?
The LM335AH operates from −40°C to +100°C under continuous conditions, with intermittent capability up to +125°C. This range is defined in TI's SNIS160E datasheet Section 6.2 and confirmed in the official orderable addendum. Operation outside this range risks parametric shift or irreversible damage. The LM335AH's TO-46 package maintains specification integrity across this full span due to hermetic sealing and low thermal resistance.
How does the ADJ pin on the LM335AH enable calibration?
The ADJ pin on the LM335AH provides access to the internal temperature coefficient adjustment node, allowing external trimming of the 10 mV/K slope via a potentiometer. As described in Section 7.3.1 of the SNIS160E datasheet, a single-point calibration at 25°C corrects full-range error because output deviation is purely scale-factor related. This eliminates need for multi-point characterization in production or field deployment.
What package type does the LM335AH use, and why does it matter?
The LM335AH uses a hermetic TO-46 (NDV) metal-can package, distinct from plastic TO-92 or SOIC variants. This construction prevents moisture ingress, minimizes long-term drift, and ensures stable thermal response - critical for applications requiring >10-year field reliability. TI specifies this package in the orderable addendum and confirms its use for LM335AH/NOPB.B with RoHS compliance and Level-1 MSL rating.
Can the LM335AH be used without calibration?
Yes, the LM335AH functions uncalibrated with ±1°C error at 25°C and ±5°C error across −40°C to +100°C per Section 6.5 of SNIS160E. However, its ADJ pin exists specifically to reduce full-range error to ≤±2°C after one-point trim - making calibration optional but highly recommended for applications demanding consistent accuracy across operating extremes.
What is the minimum and maximum bias current for stable operation of the LM335AH?
The LM335AH requires a bias current between 400 μA and 5 mA for stable regulation and specified accuracy, as stated in Section 1 and Table 6.2 of SNIS160E. Below 400 μA, zener breakdown becomes unstable; above 5 mA, self-heating exceeds 1°C at 100°C ambient. A 1 mA bias is commonly used to balance noise immunity, power consumption, and thermal error.
LM335AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-206AB, TO-46-3 Metal Can
- Packaging:
- Bulk
- 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:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- TO-46-3
LM335AH FAQ
1.How can I place an order for LM335AH through Aetrix?
Please submit a Request for Quotation (RFQ) for LM335AH 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 LM335AH reliable?
The price and inventory of LM335AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM335AH is usually 5 days.
3.What payment methods are accepted for LM335AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM335AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM335AH?
LM335AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM335AH 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 LM335AH?
For technical support, including LM335AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM335AH requirements.
6.How does Aetrix verify that LM335AH is sourced from the original manufacturer or authorized distributors?
All LM335AH 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 LM335AH meets industry standards.
7.What is the process for return or replacement of LM335AH?
All LM335AH units undergo pre-shipment inspection (PSI). If there is an issue with LM335AH, 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 LM335AH part is unused and in its original packaging.
Return procedure for LM335AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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