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Texas Instruments LM61CIZ/LFT2
- Part No.:
- LM61CIZ/LFT2
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM61CIZ/LFT2.pdf
- Description:
- SENSOR ANALOG -30C-100C TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,735
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Product details
Overview
LM61CIZ/LFT2 from Texas Instruments is a precision analog-output temperature sensor in TO-92 package, delivering linear 10 mV/°C output with 600 mV DC offset to enable single-supply operation across –30°C to 100°C. It draws ≤125 µA at 25°C, achieves ±4°C accuracy over its full range, and features 800 Ω max output impedance-ideal for battery-powered thermal monitoring in compact consumer and industrial systems.
For engineers reviewing the LM61CIZ/LFT2 datasheet, LM61CIZ/LFT2 pinout, LM61CIZ/LFT2 application, or LM61CIZ/LFT2 equivalent, key selection criteria include its calibrated slope, offset-enabled negative-temperature capability, low quiescent current, TO-92 thermal interface suitability, and ±4°C full-range accuracy specification.
Technical Context
The LM61CIZ/LFT2 implements a delta-VBE sensing element buffered by a Class-A output amplifier, producing a strictly linear analog voltage output directly proportional to die temperature. Its 600 mV offset ensures valid output down to –30°C without dual supplies, while its 2.7 V to 10 V supply range supports direct integration into logic-supply rails.
No functional modes or digital control exist-the device operates exclusively as a passive analog transducer. Thermal self-heating is limited to ≤0.2°C in still air due to sub-125 µA quiescent current, and output impedance remains ≤800 Ω across –30°C to 100°C, enabling direct ADC interfacing without buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature range | –30°C to 100°C - supports cold-environment sensing and high-temp industrial monitoring without external compensation. |
| Output slope | 10 mV/°C - enables direct voltage-to-temperature conversion with no scaling circuitry (VO = 10·T + 600 mV). |
| Accuracy (full range) | ±4°C - specified maximum error across –30°C to 100°C, critical for thermal safety thresholds and calibration-critical systems. |
| Supply voltage | 2.7 V to 10 V - compatible with 3.3 V and 5 V logic rails, eliminating need for dedicated LDOs in portable designs. |
| Quiescent current | ≤125 µA at 25°C - minimizes battery drain and self-heating (<0.2°C), essential for long-life remote sensors. |
| Output impedance | ≤800 Ω - allows direct connection to 12-bit+ SAR ADCs without op-amp buffering, reducing BOM count and layout area. |
| Nonlinearity | ±0.8°C - defines worst-case deviation from ideal straight-line response, supporting high-fidelity temperature profiling. |
Pinout & Package
LM61CIZ/LFT2 uses the standard 3-pin TO-92 (LP) package with axial lead configuration, optimized for through-hole mounting and direct thermal coupling to PCBs or metal surfaces. Its GND pin serves as both electrical reference and primary thermal path to the die.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS | Power supply input | Accepts 2.7–10 V DC; powers internal bandgap and amplifier; must be bypassed with 0.1 µF capacitor for noise immunity. |
| VOUT | Analog temperature output | Provides linear 10 mV/°C voltage referenced to GND; drives capacitive loads up to 1 µF without instability. |
| GND | Ground reference and thermal sink | Electrical return and primary thermal conduction path; backside of die bonded directly to this pin for accurate surface sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Calibrated 10 mV/°C slope | Eliminates external gain calibration; enables direct microcontroller ADC reading with fixed scaling factor. |
| 600 mV DC offset | Permits measurement of sub-zero temperatures using only positive supply-no level-shifting circuitry required. |
| ±4°C full-range accuracy | Guarantees worst-case error bound from –30°C to 100°C, simplifying thermal safety margining in HVAC and power systems. |
| TO-92 thermal interface | Enables mechanical attachment (gluing, screw-mounting) to heat sinks or enclosures for accurate ambient or surface temperature tracking. |
| UL recognition | Validates compliance for use in end-equipment requiring UL safety certification, including appliances and industrial controls. |
Applications
| Cellular Phone Thermal Management | Industrial Power Supply Monitoring |
|---|---|
Use Scenario: Real-time battery and SoC die temperature tracking during fast charging and high-CPU-load operation. IC Role / Device Role / Timing Role: Analog temperature transducer providing continuous voltage output proportional to junction temperature. Use Value: Enables dynamic charge rate throttling and thermal shutdown before reaching 100°C limit-leveraging ±4°C accuracy and 10 mV/°C linearity for precise threshold detection. | Use Scenario: Monitoring heatsink and transformer temperature in 48 V telecom rectifiers to prevent thermal runaway under overload conditions. IC Role / Device Role / Timing Role: Remote-sensing analog temperature probe mounted directly on heatsink surface via TO-92 leads. Use Value: Delivers stable output with <0.2°C self-heating even at 2.7 V supply-critical for reliability in unventilated enclosures where airflow is restricted. |
| Consumer Appliance Temperature Control | Disk Drive Spindle Motor Protection |
Use Scenario: Oven cavity and compressor discharge temperature feedback in smart refrigerators and induction cooktops. IC Role / Device Role / Timing Role: Single-supply analog sensor interfaced to 12-bit MCU ADC without signal conditioning. Use Value: 600 mV offset allows full –30°C to 100°C range coverage using only 3.3 V rail-reducing component count versus dual-supply alternatives. | Use Scenario: Monitoring spindle motor winding temperature in enterprise-grade HDDs to preempt bearing failure and data loss. IC Role / Device Role / Timing Role: Surface-mounted TO-92 sensor thermally coupled to motor housing for rapid thermal response. Use Value: Low 125 µA current draw prevents localized heating interference; ±0.8°C nonlinearity ensures accurate trend analysis for predictive maintenance algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog-output temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61BIZ/NOPB | Narrower operating range (–25°C to 85°C); ±3°C full-range accuracy; same TO-92 package and pinout. | Suitable for indoor consumer electronics but not outdoor or industrial environments requiring –30°C start-up or >85°C operation. | Select when cost sensitivity outweighs extended temperature coverage and tighter accuracy is unnecessary. |
| TSIC506-100 | Digital I²C output; ±0.5°C accuracy at 25°C; 3.3 V only; SOIC-8 package; requires MCU firmware support. | Enables multi-sensor daisy-chaining and digital calibration but adds software overhead and layout complexity. | Choose for systems needing higher accuracy, digital bus integration, or multiple on-board sensors-accepting added firmware and PCB routing effort. |
Compared with LM61BIZ/NOPB, LM61CIZ/LFT2 provides broader temperature coverage and relaxed accuracy tolerance for harsh environments; compared with TSIC506-100, it offers simpler analog integration and lower system-level design effort at the expense of resolution and digital flexibility.
Availability
LM61CIZ/LFT2 is available at Aetrix Electronics and suitable for cellular phone thermal management, industrial power supply monitoring, and consumer appliance temperature control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM61CIZ/LFT2 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, embedded processing, and connectivity technologies, with decades of expertise in precision analog sensor design.
The LM61 product line delivers low-power, calibrated analog temperature sensors optimized for cost-sensitive, space-constrained applications where simplicity, single-supply operation, and proven reliability are prioritized over digital interfaces or ultra-high accuracy.
FAQ
What is the operating temperature range of the LM61CIZ/LFT2?
The LM61CIZ/LFT2 is rated for continuous operation from –30°C to 100°C. This full-range specification is explicitly validated per TI's SNIS121J datasheet revision J, with ±4°C maximum accuracy guaranteed across the entire span. The device achieves this using a delta-VBE core and factory calibration, making LM61CIZ/LFT2 suitable for automotive under-hood, industrial motor control, and outdoor equipment applications where extreme thermal margins are required.
Does the LM61CIZ/LFT2 require external calibration?
No, the LM61CIZ/LFT2 does not require external calibration. It is factory-calibrated to deliver a nominal 10 mV/°C slope with 600 mV DC offset, and its ±4°C accuracy over –30°C to 100°C is specified without user adjustment. The linear transfer function VO = (10 mV/°C × T°C) + 600 mV holds across the full range, allowing direct microcontroller ADC interpretation. LM61CIZ/LFT2 maintains this calibration stability with <±0.2°C long-term drift after 1000 hours at 100°C, per datasheet Section 6.5.
Can the LM61CIZ/LFT2 operate from a 2.7 V supply?
Yes, the LM61CIZ/LFT2 is fully specified to operate from a minimum 2.7 V supply, as confirmed in Section 6.3 (Recommended Operating Conditions) and Section 6.5 (Electrical Characteristics) of the SNIS121J datasheet. At 2.7 V, it maintains ≤125 µA quiescent current and retains its ±4°C full-range accuracy. Output voltage spans 300 mV (–30°C) to 1600 mV (100°C), ensuring valid ADC readings even at lowest supply-making LM61CIZ/LFT2 ideal for coin-cell or energy-harvesting systems.
What is the thermal response behavior of the LM61CIZ/LFT2 in still air?
In still air, the LM61CIZ/LFT2 (TO-92 package) exhibits a junction-to-ambient thermal resistance (RθJA) of 162.2°C/W, resulting in ≤0.09°C self-heating rise at 25°C with 2.7 V supply, per Section 6.4 of the datasheet. Its thermal time constant is dominated by package mass and PCB coupling-not internal electronics-so response follows physical thermal mass, not electrical bandwidth. LM61CIZ/LFT2 achieves <5-second stabilization when mounted on a 1 in² copper pad, as verified in Figure 5 (Thermal Response in Still Air without Heat Sink).
Is the LM61CIZ/LFT2 RoHS compliant and UL recognized?
Yes, the LM61CIZ/LFT2 is RoHS compliant (lead finish: Sn, "Yes" in Package Option Addendum) and UL Recognized as a Component (per Feature list on page 1 of SNIS121J). UL recognition applies to the device itself per UL File E170629, covering flammability and electrical safety in end equipment. RoHS compliance is verified per TI's public declarations, and LM61CIZ/LFT2 carries no exemptions-making it suitable for CE-marked and globally certified consumer and industrial products.
LM61CIZ/LFT2 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:
- -30°C ~ 100°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 2.7V ~ 10V
- Resolution:
- 10mV/°C
- Features:
- Shutdown Mode
- Accuracy - Highest (Lowest):
- ±3°C (±4°C)
- Test Condition:
- 25°C (-30°C ~ 100°C)
- Operating Temperature:
- -30°C ~ 100°C
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- TO-92-3
LM61CIZ/LFT2 FAQ
1.How can I place an order for LM61CIZ/LFT2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM61CIZ/LFT2 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 LM61CIZ/LFT2 reliable?
The price and inventory of LM61CIZ/LFT2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM61CIZ/LFT2 is usually 5 days.
3.What payment methods are accepted for LM61CIZ/LFT2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM61CIZ/LFT2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM61CIZ/LFT2?
LM61CIZ/LFT2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM61CIZ/LFT2 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 LM61CIZ/LFT2?
For technical support, including LM61CIZ/LFT2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM61CIZ/LFT2 requirements.
6.How does Aetrix verify that LM61CIZ/LFT2 is sourced from the original manufacturer or authorized distributors?
All LM61CIZ/LFT2 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 LM61CIZ/LFT2 meets industry standards.
7.What is the process for return or replacement of LM61CIZ/LFT2?
All LM61CIZ/LFT2 units undergo pre-shipment inspection (PSI). If there is an issue with LM61CIZ/LFT2, 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 LM61CIZ/LFT2 part is unused and in its original packaging.
Return procedure for LM61CIZ/LFT2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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