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Texas Instruments LM20SIBP
- Part No.:
- LM20SIBP
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 4-VFBGA
- Datasheet:
-
LM20SIBP.pdf
- Description:
- SENSOR ANALOG -40C-125C 4USMD
- Quantity:
- Payment:
- Shipping:
Inventory:4,655
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Product details
Overview
LM20SIBP from Texas Instruments is a precision analog-output CMOS temperature sensor operating from 2.4 V to 5.5 V, delivering ±1.5°C accuracy at 30°C and ±3.5°C max error at −40°C/125°C extremes. Its parabolic transfer function (VO = −3.88×10⁻⁶·T² − 1.15×10⁻²·T + 1.8639 V) enables high-fidelity thermal monitoring in battery-powered systems. It draws ≤10 µA quiescent current and features 160 Ω output impedance, making it ideal for low-power embedded thermal sensing in portable electronics.
For engineers reviewing the LM20SIBP datasheet, LM20SIBP pinout, LM20SIBP application, or LM20SIBP equivalent, this page delivers verified specifications, package mapping, real-world use cases, and validated alternative options - all grounded in TI's SNIS106Q datasheet and official ordering information for the LM20S variant in DSBGA (YZR) package.
Technical Context
The LM20SIBP implements a forward-biased base-emitter junction as its sensing element, buffered by a Class-A amplifier to deliver a low-impedance analog voltage output inversely proportional to temperature. Its transfer function is explicitly defined as a second-order polynomial, not linearized internally.
It operates across −40°C to 125°C when powered at 2.7–5.5 V, or −30°C to 125°C at 2.4–5.5 V. Self-heating remains below 0.02°C in still air due to sub-10 µA quiescent current, eliminating need for active shutdown - power gating via logic-level supply suffices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.4 V to 5.5 V - supports direct Li-ion (3.0–4.2 V) and 3.3 V/5 V logic rails without regulation. |
| Temperature Range (V+ ≥2.7 V) | −40°C to 125°C - validated for automotive cabin and industrial ambient environments. |
| Accuracy (at 30°C) | ±1.5°C maximum - enables reliable thermal threshold detection without calibration in consumer devices. |
| Quiescent Current | ≤10 µA - ensures multi-year battery life in always-on thermal monitors (e.g., IoT sensors). |
| Output Impedance | 160 Ω max - drives ADC inputs directly or through simple RC filters without buffering. |
| Sensor Gain | −11.77 mV/°C average slope - provides ~1.2 V full-scale swing over 0–100°C for 12-bit ADC resolution. |
| Nonlinearity | ±0.4% over −20°C to 80°C - allows linear compensation with <0.7°C residual error in common operating bands. |
Pinout & Package
LM20SIBP is packaged in a 4-pin DSBGA (YZR) with 0.96 mm × 0.96 mm body size and 0.5 mm pitch. The die attach paddle is exposed on the bottom and must be soldered to PCB ground for optimal thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (A2) | Ground reference | Must be connected to system ground plane; serves as thermal path to PCB - floating or high-impedance connection degrades accuracy and thermal response. |
| V+ (B2) | Positive supply input | Accepts 2.4–5.5 V; line regulation ≤3.7 mV/V ensures stable output under rail variation (e.g., battery discharge). |
| VO (B1) | Analog temperature output | Voltage output inversely proportional to temperature; 160 Ω source impedance allows direct ADC sampling or RC filtering (e.g., 1 µF + 200 Ω = 442 Hz LPF). |
| NC (A1) | No-connect terminal | Must remain unconnected or grounded; no signal routing allowed - violation risks parametric shift or ESD vulnerability. |
Key Features
| Feature | Design Value |
|---|---|
| Predictable parabolic curvature | Transfer function VO = (−3.88×10⁻⁶)·T² + (−1.15×10⁻²)·T + 1.8639 V enables software-based second-order compensation with <0.01°C RMS residual error. |
| Ultra-low power operation | ≤10 µA quiescent current eliminates need for external enable control - compatible with GPIO-driven supply rails in sleep/wake architectures. |
| DSBGA thermal performance | RθJB = 40°C/W - achieves faster thermal equilibrium than SC70 variants, critical for surface-mount board-level temperature tracking. |
| Light-insensitive design (SC70 only) | DSBGA variant requires light shielding; this feature is absent in LM20SIBP - enclosure integration is mandatory to prevent >1.5 V output drop under sunlight. |
| ESD robustness | ±2500 V HBM rating - withstands handling in standard assembly environments without additional protection circuitry. |
Applications
| Portable Battery Monitoring | Industrial Motor Control |
|---|---|
Use Scenario: Real-time cell temperature tracking in single-cell Li-ion packs for smartphones and wearables. IC Role / Device Role / Timing Role: Analog temperature transducer providing voltage output to MCU ADC for charge/discharge thermal management. Use Value: ±1.5°C accuracy at 30°C enables precise thermal throttling before safety thresholds are breached, extending cycle life. |
Use Scenario: Stator winding temperature sensing in BLDC motor drives operating up to 125°C ambient. IC Role / Device Role / Timing Role: Direct-mount thermal sensor feeding closed-loop thermal derating logic in motor controller ASICs. Use Value: −40°C to 125°C range with 40°C/W RθJB ensures fast thermal response matching motor thermal time constants. |
| Medical Diagnostic Equipment | Network Infrastructure Modules |
Use Scenario: Ambient and heatsink temperature monitoring in portable ultrasound and patient monitors. IC Role / Device Role / Timing Role: Low-drift analog sensor interfaced to precision SAR ADC for regulatory-compliant thermal logging. Use Value: 0.4% nonlinearity and predictable curvature allow factory calibration with <0.1°C uncertainty over clinical operating range. |
Use Scenario: Thermal supervision of PoE-powered switches and baseband units in telecom cabinets. IC Role / Device Role / Timing Role: System-level thermal guardrail sensor triggering fan control or power reduction at 85°C. Use Value: Sub-10 µA current draw avoids loading shared 3.3 V bias rails used for multiple sensors and supervisory ICs. |
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 |
|---|---|---|---|
| LM20BIM5X | SC70-5 package; ±1.5°C accuracy at 30°C but wider error band (±2.5°C) at extremes; higher RθJA (282°C/W). | Better suited for PCBs with limited thermal mass or where top-side heat sinking is impractical. | Select LM20BIM5X only if SC70 footprint compatibility is required and thermal response speed is secondary. |
| MAX6610ASA+ | 3-pin SOT23; ±2°C accuracy at 25°C; 12-bit digital I²C output; 1.7–3.6 V supply; 12 µA typical current. | Replaces analog interface with digital bus - eliminates ADC channel usage but adds firmware dependency. | Choose MAX6610ASA+ when system already uses I²C sensors and layout space permits SOT23; avoid if analog simplicity or ultra-low power (<10 µA) is mandatory. |
Compared with LM20SIBP, LM20BIM5X trades thermal performance for package familiarity, while MAX6610ASA+ shifts from analog simplicity to digital configurability - neither offers pin compatibility, and both require layout revision and firmware adaptation.
Availability
LM20SIBP is available at Aetrix Electronics and suitable for portable battery monitoring, industrial motor control, medical diagnostic equipment, and network infrastructure modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM20SIBP 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 and low-power signal conditioning.
The LM20 product line was designed specifically for high-accuracy, ultra-low-power analog temperature measurement in space-constrained, battery-operated, and thermally dynamic systems - targeting portable electronics, industrial controls, and medical instrumentation.
FAQ
What is the guaranteed operating temperature range for LM20SIBP at 3.3 V supply?
At 3.3 V supply (within 2.7–5.5 V), LM20SIBP is specified for −40°C to 125°C operation per TI's SNIS106Q datasheet Section 6.3. This range is validated with ±3.5°C max error at extremes and ±1.5°C at 30°C. Operation outside this range may yield uncharacterized accuracy or reliability degradation.
Does LM20SIBP require external calibration to achieve its stated accuracy?
No - LM20SIBP achieves ±1.5°C accuracy at 30°C without user calibration, as confirmed in Section 6.7 of the SNIS106Q datasheet. Its parabolic transfer function is factory-characterized; applying the published equation VO = (−3.88×10⁻⁶)·T² + (−1.15×10⁻²)·T + 1.8639 V yields full-range accuracy within spec.
Can LM20SIBP be used in optical enclosures or under direct sunlight?
No - the DSBGA package of LM20SIBP is photosensitive; exposure to bright sunlight causes up to 1.5 V output drop (Section 8.1.2). TI mandates physical light shielding (e.g., opaque conformal coat or metal can) even in indoor fluorescent lighting. Failure to shield invalidates accuracy specs.
What is the maximum capacitive load LM20SIBP can drive without oscillation?
LM20SIBP drives ≤300 pF capacitive loads stably without external compensation (Section 8.1.1). For larger loads (e.g., long traces or ADC input caps), TI recommends adding a series resistor (e.g., 200 Ω) with a 1 µF capacitor to ground - forming a 442 Hz low-pass filter that preserves thermal response integrity.
How does LM20SIBP's self-heating affect measurement accuracy in still air?
LM20SIBP's ≤10 µA quiescent current limits self-heating to <0.02°C in still air (Section 7.1), making it negligible for most applications. This enables direct PCB mounting without thermal isolation - unlike higher-power sensors requiring thermal vias or standoff mounts to mitigate self-heating error.
LM20SIBP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 4-VFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Sensor Type:
- Analog, Local
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 2.4V ~ 5.5V
- Resolution:
- 11.77mV/°C
- Features:
- Shutdown Mode
- Accuracy - Highest (Lowest):
- ±2.5°C (±3.5°C)
- Test Condition:
- 25°C ~ 30°C (-40°C ~ 125°C)
- Operating Temperature:
- -40°C ~ 130°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 4-uSMD (0.85x0.85)
LM20SIBP FAQ
1.How can I place an order for LM20SIBP through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20SIBP 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 LM20SIBP reliable?
The price and inventory of LM20SIBP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20SIBP is usually 5 days.
3.What payment methods are accepted for LM20SIBP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20SIBP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20SIBP?
LM20SIBP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20SIBP 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 LM20SIBP?
For technical support, including LM20SIBP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20SIBP requirements.
6.How does Aetrix verify that LM20SIBP is sourced from the original manufacturer or authorized distributors?
All LM20SIBP 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 LM20SIBP meets industry standards.
7.What is the process for return or replacement of LM20SIBP?
All LM20SIBP units undergo pre-shipment inspection (PSI). If there is an issue with LM20SIBP, 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 LM20SIBP part is unused and in its original packaging.
Return procedure for LM20SIBP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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