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Texas Instruments LM94021QBIMGX/NOPB
- Part No.:
- LM94021QBIMGX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM94021QBIMGX/NOPB.pdf
- Description:
- SENSOR ANALOG -50C-150C SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,297
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Product details
Overview
LM94021QBIMGX/NOPB from Texas Instruments (formerly National Semiconductor) is an AEC-Q100 Grade 0 qualified analog-output CMOS temperature sensor with digitally selectable gain, operating from 1.5V to 5.5V over −50°C to +150°C. It delivers inverse-proportional voltage output with four precision slopes: −5.5, −8.2, −10.9, or −13.6 mV/°C, and achieves ±1.5°C accuracy from 20°C to 40°C - ideal for automotive battery thermal monitoring and embedded system diagnostics.
For engineers reviewing the LM94021QBIMGX/NOPB datasheet, LM94021QBIMGX/NOPB pinout, LM94021QBIMGX/NOPB application, or LM94021QBIMGX/NOPB equivalent, key selection criteria include its ultra-low 9 μA supply current, SC70-5 package footprint compatibility with LM20, gain-select logic interface (GS1/GS0), short-circuit protected analog output, and automotive-grade qualification for under-hood sensing.
Technical Context
The LM94021QBIMGX/NOPB implements a rail-to-rail NMOS/PMOS output buffer with inherent linearity and parabolic correction reflected in its published transfer table. Its gain-select architecture uses two TTL/CMOS-compatible logic inputs (GS1, GS0) to configure slope without external resistors - enabling dynamic in-system calibration and noise-optimized operation.
Thermal measurement relies on direct die-to-GND thermal conduction via Pin 2; junction self-heating remains below 0.021°C at 2 μA load. Output voltage shift due to supply variation is bounded and included in accuracy specs, with no bypass capacitor required - validated up to 6 inches from the IC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.5V to 5.5V - enables single-cell Li-ion or coin-cell operation across full temperature range |
| Supply Current | 9 μA typical - minimizes battery drain in always-on thermal monitoring |
| Temperature Accuracy | ±1.5°C (20°C–40°C), ±2.7°C (−50°C–150°C) - specified with gain setting and supply voltage dependencies |
| Output Slope Options | −5.5 / −8.2 / −10.9 / −13.6 mV/°C - selectable via GS1/GS0 logic pins for SNR optimization |
| Operating Temperature | −50°C to +150°C - AEC-Q100 Grade 0 qualified for automotive under-hood use |
| Output Short-Circuit Protection | Yes - prevents damage during wiring faults or ESD events in production environments |
| Package | 5-Pin SC70 (MAA05A) - 2.0 × 2.1 mm footprint, compatible with LM20 layout |
Pinout & Package
LM94021QBIMGX/NOPB is housed in a 5-pin SC70 package (NS drawing MAA05A), with GND-connected die backside for optimal thermal coupling to PCB copper. The compact 2.0 mm × 2.1 mm outline supports high-density automotive and portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: GS0 | Logic Input | Gain select bit 0 - driven high/low to set output slope; no pull resistors needed |
| Pin 2: GND | Power Ground | Die thermal reference and return path; directly bonded to silicon substrate |
| Pin 3: OUT | Analog Output | Inverse-proportional voltage output (e.g., 2633 mV at 0°C, GS=11); short-circuit protected |
| Pin 4: VDD | Positive Supply | 1.5V–5.5V input; powers internal bandgap and output buffer |
| Pin 5: GS1 | Logic Input | Gain select bit 1 - combined with GS0 to select one of four calibrated slopes |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for automotive applications up to +150°C ambient, including engine control and battery management |
| Four factory-calibrated gain settings | Enables dynamic trade-off between measurement range (low gain) and resolution/SNR (high gain) |
| Ultra-low quiescent current | 9 μA typical ensures >10-year battery life in low-duty-cycle monitoring systems |
| SC70-5 footprint compatibility with LM20 | Allows drop-in replacement or design reuse without PCB layout changes |
| Output short-circuit protection | Eliminates need for external series resistance in harsh wiring environments |
Applications
| Automotive Battery Pack Monitoring | Industrial Motor Winding Sensing |
|---|---|
|
Use Scenario: Real-time temperature tracking of lithium-ion battery cells in EV powertrain modules, where thermal runaway prevention requires accurate −40°C to +85°C readings. IC Role / Device Role / Timing Role: Analog temperature transducer providing inverse-voltage output to MCU ADC; gain configured to −13.6 mV/°C for maximum resolution in critical zone. Use Value: ±1.5°C accuracy at 25°C enables precise state-of-charge and thermal derating algorithms without software compensation. |
Use Scenario: Continuous thermal surveillance of stator windings in IPM motors used in HVAC compressors and industrial pumps. IC Role / Device Role / Timing Role: Direct-mount temperature sensor interfaced to isolated sigma-delta ADC; GS1/GS0 tied to fixed logic for −8.2 mV/°C slope. Use Value: 1.5V minimum supply allows integration into low-voltage auxiliary power rails, reducing BOM count vs. LDO-dependent alternatives. |
| Consumer Portable Device Thermal Management | Appliance Control Board Diagnostics |
|
Use Scenario: Compact thermal feedback in wireless earbuds and smartwatches, where space constraints demand sub-2.5 mm² solutions. IC Role / Device Role / Timing Role: System-level temperature monitor feeding host SoC; gain switched dynamically during charging cycles to optimize ADC LSB utilization. Use Value: SC70-5 footprint and LM20 compatibility enable reuse of existing test fixtures and pick-and-place programs. |
Use Scenario: Overtemperature detection in microwave oven control boards, requiring reliable operation from −20°C storage to +105°C cooking ambient. IC Role / Device Role / Timing Role: Standalone analog sensor driving comparator threshold circuit; GS1/GS0 hardwired for −5.5 mV/°C to maximize full-range coverage at 1.8V supply. Use Value: UL Recognition and ±2.1°C accuracy over −50°C to +90°C ensure compliance with IEC 60335 safety standards. |
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 −10.0 mV/°C slope; no gain-select inputs; ±2.5°C accuracy over −50°C to +130°C | Lacks programmable gain and automotive qualification; suitable for cost-sensitive consumer applications | Select when gain flexibility and AEC-Q100 compliance are unnecessary and board space permits larger SOT-23-5 |
| MAX6611ASA+ | Fixed −11.9 mV/°C slope; 2.7V–5.5V supply; ±2.0°C accuracy over −40°C to +125°C; includes internal 1.25V reference | No automotive qualification; higher minimum supply voltage limits battery-powered use | Prefer when integrated reference simplifies ADC interface and AEC-Q100 is not required |
Compared with LM20BIM7/NOPB and MAX6611ASA+, the LM94021QBIMGX/NOPB uniquely combines AEC-Q100 Grade 0 qualification, 1.5V operation, and four-user-selectable gains - making it the only choice for automotive thermal monitoring where supply headroom and diagnostic flexibility are constrained.
Availability
LM94021QBIMGX/NOPB is available at Aetrix Electronics and suitable for automotive battery management, industrial motor control, and portable device thermal monitoring requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM94021QBIMGX/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 maintains its precision analog portfolio, emphasizing high-reliability signal conditioning and sensing solutions for automotive, industrial, and computing markets.
The LM94021QBIMGX/NOPB belongs to TI's automotive-qualified temperature sensor family, designed specifically for under-hood and battery-pack thermal monitoring where low-voltage operation, gain flexibility, and AEC-Q100 compliance are mandatory.
FAQ
What is the minimum supply voltage required for LM94021QBIMGX/NOPB to operate across its full −50°C to +150°C range?
The LM94021QBIMGX/NOPB achieves full-range operation at 1.5V only in the lowest-gain configuration (GS1 = 0, GS0 = 0). At higher gains, minimum supply increases: 1.8V (GS=01), 2.2V (GS=10), and 2.7V (GS=11). These thresholds ensure monotonic output and specified accuracy across temperature - all detailed in the Electrical Characteristics table of the LM94021QBIMGX/NOPB datasheet.
How does the LM94021QBIMGX/NOPB handle capacitive loads on its output pin?
The LM94021QBIMGX/NOPB drives capacitive loads up to 1100 pF without external compensation. For loads exceeding this - such as ADC sampling capacitors or long PCB traces - a series resistor (e.g., 3 kΩ for 1.1–99 nF) is recommended per Figure 3 in the LM94021QBIMGX/NOPB datasheet. This preserves stability while maintaining accuracy within ±2.7°C.
Is LM94021QBIMGX/NOPB pin-compatible with the LM20 temperature sensor?
Yes - the LM94021QBIMGX/NOPB uses the same 5-pin SC70 package (MAA05A) and identical pinout as the LM20, enabling direct PCB footprint reuse. However, LM94021QBIMGX/NOPB adds gain-select logic inputs (GS1/GS0) on Pins 5 and 1, which must be tied appropriately (not left floating) to avoid undefined output behavior.
What AEC-Q100 stress tests has the LM94021QBIMGX/NOPB passed?
The LM94021QBIMGX/NOPB is certified AEC-Q100 Grade 0, meaning it meets stress testing requirements for ambient temperatures up to +150°C, including accelerated environmental stress (HTOL, TC, UHAST), ESD (HBM 2500V), and electrical verification across temperature and voltage extremes - as documented in TI's LM94021QBIMGX/NOPB qualification report.
Can the gain-select pins (GS1/GS0) of LM94021QBIMGX/NOPB be left unconnected?
No - GS1 and GS0 must be actively driven high or low; floating inputs cause undefined gain selection and unpredictable output voltage. They may be tied directly to VDD or GND (no pull resistors required) or driven by microcontroller GPIOs. The LM94021QBIMGX/NOPB datasheet specifies VIH ≥ VDD − 0.5V and VIL ≤ 0.5V for valid logic levels.
LM94021QBIMGX/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:
- Active
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- SC-70-5
LM94021QBIMGX/NOPB FAQ
1.How can I place an order for LM94021QBIMGX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM94021QBIMGX/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 LM94021QBIMGX/NOPB reliable?
The price and inventory of LM94021QBIMGX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM94021QBIMGX/NOPB is usually 5 days.
3.What payment methods are accepted for LM94021QBIMGX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM94021QBIMGX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM94021QBIMGX/NOPB?
LM94021QBIMGX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM94021QBIMGX/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 LM94021QBIMGX/NOPB?
For technical support, including LM94021QBIMGX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM94021QBIMGX/NOPB requirements.
6.How does Aetrix verify that LM94021QBIMGX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM94021QBIMGX/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 LM94021QBIMGX/NOPB meets industry standards.
7.What is the process for return or replacement of LM94021QBIMGX/NOPB?
All LM94021QBIMGX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM94021QBIMGX/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 LM94021QBIMGX/NOPB part is unused and in its original packaging.
Return procedure for LM94021QBIMGX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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