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Texas Instruments LM94021BIMG/NOPB
- Part No.:
- LM94021BIMG/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM94021BIMG/NOPB.pdf
- Description:
- SENSOR ANALOG -50C-150C SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,038
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Product details
Overview
LM94021BIMG/NOPB from Texas Instruments (formerly National Semiconductor) is a precision analog-output CMOS temperature sensor with digitally selectable gain, operating from 1.5V to 5.5V over −50°C to +150°C. Its output voltage is inversely proportional to temperature, with four calibrated slopes (−5.5 to −13.6 mV/°C), ±1.5°C accuracy at 20°C–40°C, and 9 μA typical supply current - ideal for battery-powered thermal monitoring in compact systems.
For engineers reviewing the LM94021BIMG/NOPB datasheet, LM94021BIMG/NOPB pinout, LM94021BIMG/NOPB application, or LM94021BIMG/NOPB equivalent, key selection criteria include gain-select logic compatibility, SC70 package thermal interface, low-voltage full-range operation (−50°C to +150°C at 1.5V), and output short-circuit protection.
Technical Context
The LM94021BIMG/NOPB implements a rail-to-rail NMOS/PMOS output buffer with intrinsic supply-voltage-dependent output shift (≤ few mV, included in accuracy specs). Its transfer function exhibits slight downward parabolic nonlinearity, fully characterized in the official Transfer Table for lookup-based compensation.
Gain selection is performed via two CMOS-compatible logic inputs (GS1, GS0), each with VIH ≥ VDD − 0.5V and VIL ≤ 0.5V, enabling direct tie-to-rail or microcontroller GPIO control without pull resistors. The device delivers monotonic output across its full range despite minor line regulation (200 μV/V) and load regulation (≤1.6 mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.5V to 5.5V - enables single-cell Li-ion or alkaline battery operation down to 1.5V while maintaining full −50°C to +150°C range in lowest-gain mode |
| Supply Current | 9 μA typ - minimizes self-heating (<0.021°C junction rise) and extends battery life in always-on sensing |
| Temperature Accuracy | ±1.5°C (20°C–40°C), ±2.7°C (−50°C–150°C) - specified across all four gain settings with no additional calibration required |
| Output Slope Options | −5.5, −8.2, −10.9, −13.6 mV/°C - selectable via GS1/GS0 to optimize ADC resolution or noise immunity per system requirement |
| Thermal Resistance θJA | 415°C/W (SC70) - defines self-heating impact; requires minimal PCB copper for accurate die-temperature measurement |
| Capacitive Load Limit | 1100 pF max - supports direct connection to most sampling ADCs without series resistance or buffering |
| Logic Input Thresholds | VIL ≤ 0.5V, VIH ≥ VDD − 0.5V - ensures robust interfacing with 1.8V/3.3V/5V digital controllers without level-shifting |
Pinout & Package
LM94021BIMG/NOPB uses a 5-pin SC70 package (NS Package MAA05A), with the die backside thermally connected to Pin 2 (GND) for accurate thermal coupling to the PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GS0 (Pin 1) | Logic input | Lower-order gain select bit; sets slope with GS1; compatible with direct VDD/GND tie or GPIO drive |
| GND (Pin 2) | Power ground | Reference node and thermal conduction path - die backside attached directly to this pin |
| OUT (Pin 3) | Analog output | Inversely proportional voltage output (mV); short-circuit protected; drives up to ±7 mA |
| VDD (Pin 4) | Positive supply | 1.5V–5.5V input; powers internal bandgap and output buffer; no bypass cap required |
| GS1 (Pin 5) | Logic input | Upper-order gain select bit; used with GS0 to select one of four calibrated output slopes |
Key Features
| Feature | Design Value |
|---|---|
| Four factory-calibrated gain options | Enables system-level optimization: low gain for wide-range low-voltage operation, high gain for improved ADC SNR in noisy environments |
| Direct rail-tie logic inputs | Eliminates external pull-up/pull-down resistors - reduces BOM count and board area in space-constrained designs |
| Output short-circuit protection | Prevents damage during accidental probe contact or PCB trace shorts - enhances field reliability without external current limiting |
| SC70 footprint compatibility with LM20 | Allows drop-in replacement or design reuse in legacy temperature-sensing layouts without PCB redesign |
| UL Recognized Component | Meets UL 60950-1 requirements for end-equipment safety certification - reduces compliance validation effort |
Applications
| Cell Phone Thermal Management | Battery Pack Temperature Monitoring |
|---|---|
Use Scenario: Real-time die temperature tracking in smartphone SoC thermal throttling loops. IC Role / Device Role / Timing Role: Analog temperature sensor providing inverse-voltage output sampled by baseband processor ADC. Use Value: ±1.5°C accuracy at 25°C enables precise thermal margining; 9 μA quiescent current minimizes impact on standby battery drain. | Use Scenario: Monitoring Li-ion cell temperature during charge/discharge cycles in portable power tools. IC Role / Device Role / Timing Role: Primary temperature sensing element interfaced to battery management IC or MCU ADC. Use Value: −50°C to +150°C range covers full operational envelope; SC70 package allows placement adjacent to cells with minimal thermal mass. |
| Automotive Cabin Climate Control | Disk Drive Spindle Motor Thermal Protection |
Use Scenario: Ambient air temperature sensing behind dashboard vents for HVAC feedback control. IC Role / Device Role / Timing Role: Low-power analog sensor supplying linear voltage output to climate controller MCU. Use Value: 1.5V operation supports direct connection to 1.8V I/O domains; ±2.7°C accuracy over −40°C to +85°C meets automotive ambient spec. | Use Scenario: Embedded thermal monitoring inside 2.5" HDD enclosures to prevent spindle motor overheating. IC Role / Device Role / Timing Role: Die-temperature sensor mounted on drive PCB near motor driver IC. Use Value: GND-connected die backside ensures fast thermal response to motor heat; SC70 size fits tight mechanical constraints. |
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/NOPB | Fixed −10.9 mV/°C slope; no gain-select pins; ±2.5°C accuracy over −40°C to +125°C | Lacks in-system gain reconfiguration; lower accuracy at extremes; simpler 3-pin SOT-23 interface | Select when fixed gain and minimal pin count outweigh need for multi-range flexibility |
| MAX6610ASA+ | Fixed −11.9 mV/°C slope; 2.7V–5.5V supply; ±2°C accuracy over −40°C to +125°C; includes internal 1.25V reference | No logic inputs; higher minimum supply; tighter accuracy in industrial range but narrower temp span | Select when biasing into higher-VDD systems where reference stability is critical and gain tuning is unnecessary |
Compared with LM20BIM7/NOPB and MAX6610ASA+, the LM94021BIMG/NOPB uniquely supports dynamic gain switching for adaptive resolution, operates down to 1.5V for ultra-low-power designs, and maintains specified accuracy across the widest industrial temperature range (−50°C to +150°C).
Availability
LM94021BIMG/NOPB is available at Aetrix Electronics and suitable for battery management, automotive cabin sensing, and disk drive thermal protection requiring stable component supply and long-term lifecycle support.
Supply support for LM94021BIMG/NOPB 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 acquired National Semiconductor in 2011 and integrates its precision analog portfolio into TI's broad signal-chain and sensing solutions.
The LM94021BIMG/NOPB belongs to TI's analog temperature sensor product line, designed specifically for applications demanding wide-temperature-range accuracy, ultra-low power, and configurable sensitivity in space-constrained systems.
FAQ
What is the minimum supply voltage required for full-range operation of LM94021BIMG/NOPB?
The LM94021BIMG/NOPB achieves full −50°C to +150°C operation at 1.5V only in the lowest-gain configuration (GS1 = 0, GS0 = 0, −5.5 mV/°C). Higher gains require progressively higher minimum supplies: 1.8V (GS=01), 2.2V (GS=10), and 2.7V (GS=11). This is explicitly defined in the Operating Ratings table.
How does the LM94021BIMG/NOPB handle capacitive loads on its output?
The LM94021BIMG/NOPB is rated for up to 1100 pF capacitive load without external compensation. For loads exceeding this value - such as large ADC sampling capacitors or long PCB traces - a series resistor (e.g., 800 Ω for 1 μF) must be added between OUT and the load, as shown in Figure 3 of the datasheet.
Can the LM94021BIMG/NOPB be used in automotive applications?
The LM94021BIMG/NOPB itself is not AEC-Q100 qualified; that qualification applies only to the LM94021QBIMG/NOPB variant. While the LM94021BIMG/NOPB shares identical electrical specifications, it is intended for commercial/industrial use. For automotive-grade reliability, LM94021QBIMG/NOPB must be selected.
What is the thermal relationship between the LM94021BIMG/NOPB die and its GND pin?
The LM94021BIMG/NOPB die backside is directly attached to Pin 2 (GND), making GND the primary thermal conduction path. Accurate temperature measurement requires low-thermal-resistance connection of this pin to the PCB ground plane - traces or pads connected to GND dominate the effective θJA of 415°C/W.
Does the LM94021BIMG/NOPB require an external bypass capacitor?
No bypass capacitor is required for stable operation of the LM94021BIMG/NOPB because it draws only 9 μA quiescent current and has no transient supply demands. Bench testing confirms reliable operation even with bypass capacitance located up to 6 inches away - though local 100 nF may be added in exceptionally noisy environments.
LM94021BIMG/NOPB 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:
- -50°C ~ 150°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 1.5V ~ 5.5V
- Resolution:
- 5.5 ~ 13.6mV/°C
- Features:
- Programmable Resolution
- Accuracy - Highest (Lowest):
- ±1.5°C (±2.7°C)
- Test Condition:
- 20°C ~ 40°C (-50°C ~ 150°C)
- Operating Temperature:
- -50°C ~ 150°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SC-70-5
LM94021BIMG/NOPB FAQ
1.How can I place an order for LM94021BIMG/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM94021BIMG/NOPB 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 LM94021BIMG/NOPB reliable?
The price and inventory of LM94021BIMG/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM94021BIMG/NOPB is usually 5 days.
3.What payment methods are accepted for LM94021BIMG/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM94021BIMG/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM94021BIMG/NOPB?
LM94021BIMG/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM94021BIMG/NOPB 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 LM94021BIMG/NOPB?
For technical support, including LM94021BIMG/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM94021BIMG/NOPB requirements.
6.How does Aetrix verify that LM94021BIMG/NOPB is sourced from the original manufacturer or authorized distributors?
All LM94021BIMG/NOPB 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 LM94021BIMG/NOPB meets industry standards.
7.What is the process for return or replacement of LM94021BIMG/NOPB?
All LM94021BIMG/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM94021BIMG/NOPB, 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 LM94021BIMG/NOPB part is unused and in its original packaging.
Return procedure for LM94021BIMG/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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