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Texas Instruments LM20CIM7
- Part No.:
- LM20CIM7
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM20CIM7.pdf
- Description:
- SENSOR ANALOG -55C-130C SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,748
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Product details
Overview
LM20CIM7 from Texas Instruments is a precision analog-output CMOS temperature sensor in SC70-5 package, operating from −55°C to 130°C at 2.4 V–5.5 V supply, delivering ±4°C max accuracy at 30°C and ±5°C at extremes, with 10 µA quiescent current and 160 Ω output impedance - used for battery-powered thermal monitoring in portable electronics.
For engineers reviewing the LM20CIM7 datasheet, LM20CIM7 pinout, LM20CIM7 application, or LM20CIM7 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and application-specific implementation insights - all grounded in TI's SNIS106Q revision Q datasheet.
Technical Context
The LM20CIM7 implements a parabolic transfer function VO = (−3.88×10⁻⁶×T²) + (−1.15×10⁻²×T) + 1.8639 V, enabling ±4°C accuracy at 30°C and ±5°C at −55°C/130°C when powered at 2.7–5.5 V. Its sensing element is a forward-biased base-emitter junction buffered by a Class-A amplifier.
It delivers predictable curvature error, supports capacitive loads up to 300 pF without decoupling, and exhibits <0.02°C self-heating in still air due to ≤10 µA quiescent current. Output impedance remains ≤160 Ω across −55°C to 130°C, enabling direct ADC interfacing without buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.4 V to 5.5 V - enables direct operation from single Li-ion cell (3.0–4.2 V) or 3.3 V logic rails without regulation. |
| Temperature Range | −55°C to 130°C at V+ ≥ 2.7 V - supports automotive under-hood, industrial motor, and computing thermal zones. |
| Accuracy (30°C) | ±4°C maximum - calibrated to parabolic model; sufficient for non-critical thermal alerts and fan control thresholds. |
| Quiescent Current | ≤10 µA - ensures <0.02°C self-heating in still air and enables always-on monitoring in battery-constrained devices. |
| Output Impedance | ≤160 Ω - allows direct connection to SAR or delta-sigma ADC inputs without external buffer or gain stage. |
| Sensor Gain | −11.77 mV/°C average slope - provides ~1.5 V full-scale swing over 0°C–130°C, matching 12-bit ADC resolution with >1 LSB/°C. |
| Nonlinearity | ±0.4% typical - deviation from best-fit line over −20°C to 80°C; compensated via quadratic equation in firmware. |
Pinout & Package
LM20CIM7 uses the SC70-5 (DCK) package: 2.00 mm × 1.25 mm, 0.65 mm pitch, 5-pin surface-mount outline with exposed die attach paddle connected to GND for thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive power supply input | Accepts 2.4–5.5 V; must be bypassed with 0.1 µF capacitor to GND for noise immunity in noisy environments. |
| GND (Pin 2) | Ground reference and thermal path | Die attach paddle; must be soldered to PCB ground plane for optimal thermal conductivity and junction-to-board resistance of 62°C/W. |
| VO | Analog temperature output | High-impedance voltage source (≤160 Ω); sinks ≤1 µA, sources ≤16 µA - compatible with RC filtering (e.g., 1 µF + 200 Ω) for EMI suppression. |
| NC (Pin 1) | No-connect terminal | Must remain floating or grounded; no signal routing allowed - prevents parasitic coupling or thermal distortion. |
| GND (Pin 5) | Signal ground reference | Provides low-impedance return path for VO; should share same ground net as V+ bypass cap to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Predictable parabolic curvature | Enables software compensation using VO = (−3.88×10⁻⁶×T²) + (−1.15×10⁻²×T) + 1.8639 V - reduces calibration burden vs. lookup tables. |
| Ultra-low quiescent current | ≤10 µA at 2.4–5.5 V - permits continuous monitoring in coin-cell or energy-harvesting systems with multi-year battery life. |
| SC70-5 footprint | 2.00 mm × 1.25 mm body size - fits high-density layouts in smartphones, wearables, and compact power modules without area penalty. |
| Capacitive load tolerance | Drives ≤300 pF directly - eliminates need for output buffer in most microcontroller ADC interfaces, reducing BOM count. |
| Light-insensitive design (SC70) | No photovoltaic drift - unlike DSBGA variant, SC70 package prevents sunlight-induced 1.5 V output drop, ensuring stable readings in exposed locations. |
Applications
| Cellular Phones | Power Supply Modules |
|---|---|
Use Scenario: Real-time battery and SoC die temperature monitoring during fast charging and sustained CPU/GPU load. IC Role / Device Role / Timing Role: Analog-output temperature sensor providing voltage proportional to junction temperature for firmware-based thermal throttling. Use Value: Enables precise thermal margining with ±4°C accuracy at 30°C and <0.02°C self-heating - critical for safety compliance and battery longevity. |
Use Scenario: Monitoring MOSFET and inductor temperature in DC-DC converters to prevent thermal runaway during overload conditions. IC Role / Device Role / Timing Role: Standalone analog temperature transducer interfaced to MCU ADC for closed-loop thermal protection. Use Value: 160 Ω output impedance allows direct ADC sampling; 10 µA current draw avoids loading sensitive feedback networks. |
| Battery Management Systems | HVAC Controllers |
Use Scenario: Measuring pack-level temperature gradients in multi-cell Li-ion battery packs for state-of-charge and aging estimation. IC Role / Device Role / Timing Role: Low-power, rail-to-rail compatible sensor supplying linearized voltage output to battery gauge IC or host MCU. Use Value: Operates down to 2.4 V - matches minimum battery voltage during deep discharge, ensuring continuous thermal visibility. |
Use Scenario: Ambient and heat-exchanger coil temperature sensing in residential and commercial HVAC units for PID control. IC Role / Device Role / Timing Role: Primary temperature transducer in thermostat subsystem, feeding analog signal to HVAC controller ADC. Use Value: −55°C to 130°C range covers outdoor winter operation and indoor furnace duct monitoring; SC70 package withstands reflow and vibration. |
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 |
|---|---|---|---|
| LM20BIM7 | ±1.5°C max accuracy at 30°C (vs. ±4°C for LM20CIM7); otherwise identical electrical specs and SC70-5 package. | Preferred where tighter thermal thresholding is required - e.g., medical device temperature alarms or precision fan speed control. | Select LM20BIM7 when system-level accuracy budget demands <±2°C error at room temperature. |
| TS2012-5.0TR | 5.0 V fixed supply, ±2.5°C accuracy, 30 µA IQ, SOT-23-3 package - lacks parabolic model support and wide supply flexibility. | Suitable only for 5 V rail-sourced designs; higher current draw limits battery life; no curvature compensation capability. | Choose TS2012-5.0TR only if existing 5 V infrastructure prohibits supply voltage scaling and accuracy requirements are relaxed. |
Compared with LM20BIM7 and TS2012-5.0TR, LM20CIM7 offers the broadest supply range (2.4–5.5 V) and lowest quiescent current (≤10 µA), making it optimal for portable, multi-rail, or energy-sensitive systems - while LM20BIM7 trades cost for accuracy, and TS2012-5.0TR sacrifices flexibility for simplicity in fixed-voltage applications.
Availability
LM20CIM7 is available at Aetrix Electronics and suitable for cellular phones, power supply modules, and battery management systems requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for LM20CIM7 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 sensing, power management, and signal chain solutions.
The LM20 product line was designed for low-power, high-accuracy analog temperature measurement in space-constrained and battery-operated systems - emphasizing minimal self-heating, predictable curvature, and direct microcontroller interface capability.
FAQ
What is the operating temperature range of the LM20CIM7?
The LM20CIM7 operates from −55°C to 130°C when powered at 2.7 V to 5.5 V. At 2.4 V supply, the lower limit shifts to −30°C while the upper limit remains 130°C. This range is validated per TI's SNIS106Q datasheet and applies specifically to the LM20CIM7 SC70-5 variant.
How does the LM20CIM7 achieve its accuracy specification?
The LM20CIM7 achieves ±4°C maximum accuracy at 30°C by calibrating to a parabolic transfer function VO = (−3.88×10⁻⁶×T²) + (−1.15×10⁻²×T) + 1.8639 V. Error increases linearly to ±5°C at −55°C and 130°C. This model is implemented in firmware or lookup tables to correct raw ADC readings.
Can the LM20CIM7 drive an ADC input directly without a buffer?
Yes - the LM20CIM7 has ≤160 Ω output impedance and can source up to 16 µA, enabling direct connection to most SAR and delta-sigma ADC inputs. No external buffer is needed unless capacitive loading exceeds 300 pF or EMI mitigation requires RC filtering.
Is the LM20CIM7 affected by ambient light exposure?
No - the LM20CIM7 uses the SC70-5 (DCK) package, which is not light-sensitive. Unlike the DSBGA variant (YZR), the SC70 package prevents photovoltaic voltage drop; output remains stable under fluorescent lighting or direct sunlight.
What is the recommended power supply bypassing for the LM20CIM7?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed between V+ and GND, as close as possible to the LM20CIM7 pins. This minimizes supply noise coupling into the analog output and ensures stable operation in electrically noisy environments such as switching power supplies or motor drives.
LM20CIM7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Sensor Type:
- Analog, Local
- Sensing Temperature - Local:
- -55°C ~ 130°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 2.4V ~ 5.5V
- Resolution:
- 11.77mV/°C
- Features:
- Shutdown Mode
- Accuracy - Highest (Lowest):
- ±4°C (±5°C)
- Test Condition:
- 25°C ~ 30°C (-55°C ~ 130°C)
- Operating Temperature:
- -55°C ~ 130°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SC-70-5
LM20CIM7 FAQ
1.How can I place an order for LM20CIM7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20CIM7 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 LM20CIM7 reliable?
The price and inventory of LM20CIM7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20CIM7 is usually 5 days.
3.What payment methods are accepted for LM20CIM7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20CIM7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20CIM7?
LM20CIM7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20CIM7 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 LM20CIM7?
For technical support, including LM20CIM7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20CIM7 requirements.
6.How does Aetrix verify that LM20CIM7 is sourced from the original manufacturer or authorized distributors?
All LM20CIM7 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 LM20CIM7 meets industry standards.
7.What is the process for return or replacement of LM20CIM7?
All LM20CIM7 units undergo pre-shipment inspection (PSI). If there is an issue with LM20CIM7, 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 LM20CIM7 part is unused and in its original packaging.
Return procedure for LM20CIM7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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