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Texas Instruments LM2902KNSR
- Part No.:
- LM2902KNSR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
LM2902KNSR.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,230
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Product details
Overview
LM2902KNSR from Texas Instruments is a quad operational amplifier optimized for single-supply operation, featuring rail-to-rail input (common-mode down to V–), 3V to 36V supply range, ±3mV max input offset voltage at 25°C, 1.2MHz gain-bandwidth product, and 240µA per amplifier quiescent current. It serves as a precision signal conditioning and level-shifting IC in industrial power supplies and appliance control circuits.
For engineers reviewing the LM2902KNSR datasheet, LM2902KNSR pinout, LM2902KNSR application, or LM2902KNSR equivalent, key selection criteria include its extended temperature range (–40°C to +125°C), integrated EMI/RF filtering, drop-in compatibility with legacy LM2902 variants, and validated performance under high common-mode transients in motor-drive feedback loops.
Technical Context
The LM2902KNSR implements a standard voltage-feedback op-amp topology with unity-gain stability and internal frequency compensation. Its input stage supports common-mode voltages extending to the negative rail (V–), enabling direct sensing of ground-referenced signals without level-shifting circuitry.
It delivers 0.5V/µs slew rate and 4µs settling time to 0.1% for 2V steps, with output swing within 1.5V of the positive rail and 100mV of the negative rail at light load-critical for accurate analog-to-digital conversion interfacing in cost-sensitive embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3V to 36V - supports wide-input industrial and automotive power rails without external regulation |
| Input Offset Voltage (max) | ±3mV at 25°C - enables accurate DC-coupled amplification in sensor front-ends |
| Gain-Bandwidth Product | 1.2MHz - sufficient for anti-aliasing filters and closed-loop control up to ~100kHz |
| Quiescent Current (per amp) | 240µA typical - allows four-channel operation below 1mA total, ideal for battery-backed systems |
| Common-Mode Input Range | V– to (V+) – 1.5V - permits direct interface with 0V-referenced transducers and current-sense shunts |
| Output Swing (min) | Within 100mV of V– and 1.5V of V+ - preserves dynamic range when driving ADC inputs near supply rails |
| Operating Temperature | –40°C to +125°C - qualified for under-hood and industrial motor-control environments |
Pinout & Package
LM2902KNSR is housed in a 14-pin SOIC (D package), 8.65mm × 6mm body size, with exposed pad not present and no thermal pad requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1IN– | Inverting input of amplifier A - accepts differential or single-ended feedback configurations |
| 2 | 1IN+ | Non-inverting input of amplifier A - used for reference biasing or sensor signal injection |
| 3 | 1OUT | Output of amplifier A - drives loads up to 10kΩ with rail-swing capability |
| 4 | VCC+ | Positive supply rail - connects to main system VDD (3V–36V) |
| 5 | 2IN+ | Non-inverting input of amplifier B - isolated from other channels for independent signal paths |
| 6 | 2IN– | Inverting input of amplifier B - supports summing or difference amplifier topologies |
| 7 | 2OUT | Output of amplifier B - electrically isolated; no crosstalk beyond 120dB channel separation |
| 8 | 3OUT | Output of amplifier C - shares same die but operates independently per channel |
| 9 | 3IN– | Inverting input of amplifier C - referenced to local ground or virtual ground node |
| 10 | 3IN+ | Non-inverting input of amplifier C - compatible with low-impedance sources (Zin > 4GΩ) |
| 11 | VCC– | Negative supply or ground - must be connected even in single-supply mode |
| 12 | 4IN+ | Non-inverting input of amplifier D - supports high-side current sensing with V– = GND |
| 13 | 4IN– | Inverting input of amplifier D - used for comparator hysteresis or active filter feedback |
| 14 | 4OUT | Output of amplifier D - capable of sinking 20mA or sourcing 30mA at room temperature |
Key Features
| Feature | Design Value |
|---|---|
| Drop-in replacement for LM2902 | Pin-compatible and functionally identical to legacy LM2902, enabling zero-layout change upgrades |
| EMI/RF rejection filter | Integrated on-die filtering reduces susceptibility to 100MHz–2GHz noise in switching power supply environments |
| Low input bias current | ≤35nA max across –40°C to +125°C - minimizes error in high-impedance pH or thermocouple interfaces |
| High ESD robustness | 2kV HBM / 1.5kV CDM rating - eliminates need for external TVS diodes in factory automation I/O modules |
| Rail-to-rail input stage | Common-mode range includes V– - enables direct connection to grounded shunt resistors without level shifters |
Applications
| Industrial Power Supply Monitoring | Appliance Motor Control Feedback |
|---|---|
Use Scenario: Real-time monitoring of +12V and +24V rails in server PSUs using resistor-divider networks feeding into LM2902KNSR buffers. IC Role / Device Role / Timing Role: Quad op-amp configured as unity-gain buffer and differential amplifier for isolated voltage sensing. Use Value: Maintains ±0.5% measurement accuracy over –40°C to +125°C while rejecting ripple from adjacent SMPS stages. | Use Scenario: Closed-loop speed regulation in HVAC blower motors via back-EMF sensing and PWM-driven H-bridge control. IC Role / Device Role / Timing Role: Signal conditioner for hall-effect rotor position feedback and current-sense amplifier for phase-current limiting. Use Value: Enables <10µs overload recovery and stable 100kHz loop bandwidth due to 1.2MHz GBW and 0.5V/µs slew rate. |
| Smart Meter Analog Front-End | Automotive Body Control Module |
Use Scenario: Isolation-amplifier input stage for current transformer secondary signals in Class 0.5 electricity meters. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with programmable gain and offset calibration. Use Value: Achieves <3mV offset drift over lifetime, meeting IEC 62053-21 metrology requirements without trimming. | Use Scenario: Window lift and seat position feedback using potentiometric sensors in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Rail-to-rail input amplifier converting 0–5V sensor outputs to microcontroller ADC inputs. Use Value: Operates reliably at cold-crank voltage (6.5V) and hot-soak conditions (+125°C), eliminating brownout resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2902DR | Same SOIC-14 package; identical electrical specs but rated only to +85°C ambient | Limited to commercial-grade applications; unsuitable for under-hood or industrial enclosures above 85°C | Select LM2902KNSR when extended temperature qualification (–40°C to +125°C) is required |
| LM2902VQDR | Automotive AEC-Q100 Grade 1 (–40°C to +125°C); same pinout but enhanced ESD (2kV HBM) and tighter parametric screening | Qualified for safety-critical body electronics; includes PPAP documentation and lot traceability | Choose LM2902VQDR for automotive OEM designs requiring formal qualification evidence |
Compared with LM2902DR and LM2902VQDR, the LM2902KNSR provides full industrial temperature support without automotive certification overhead-making it optimal for industrial PLC I/O modules and white-goods control boards where cost and qualification scope must be balanced.
Availability
LM2902KNSR is available at Aetrix Electronics and suitable for industrial power supplies, appliance motor controllers, and smart metering systems requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM2902KNSR 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM2902KNSR belongs to TI's general-purpose op-amp portfolio designed specifically for cost-sensitive, high-volume industrial and consumer applications demanding reliability, ease of use, and broad operating margins.
FAQ
What is the maximum supply voltage rating for LM2902KNSR?
The absolute maximum supply voltage for LM2902KNSR is 40V across VCC+ and VCC– terminals. However, recommended operating conditions specify 3V to 36V for reliable long-term performance. Exceeding 36V may degrade parametric guarantees such as input offset drift and output swing, especially at elevated temperatures. The LM2902KNSR datasheet confirms this limit in Section 6.1 Absolute Maximum Ratings.
Does LM2902KNSR support true rail-to-rail output swing?
No, LM2902KNSR does not provide rail-to-rail output swing. Its output can swing within 100mV of VCC– and within 1.5V of VCC+ under light load (50µA). At higher loads (1mA), swing degrades to 750mV above VCC– and 1.6V below VCC+. This behavior is documented in Section 6.6 Electrical Characteristics for LM2902B and LM2902BA, which applies to LM2902KNSR as a member of the LM2902B family.
Can LM2902KNSR replace older LM2902N or LM2902P variants in existing PCBs?
Yes, LM2902KNSR is a direct drop-in replacement for LM2902N (PDIP-14) and LM2902P (SOIC-14) in terms of pinout, function, and electrical behavior. It maintains identical SOIC-14 footprint and terminal assignments. While LM2902N operates only to +70°C and LM2902P to +85°C, LM2902KNSR extends operation to +125°C-making it backward-compatible with improved thermal margin.
What is the input bias current specification for LM2902KNSR at 125°C?
At TA = +125°C, the input bias current for LM2902KNSR is guaranteed ≤ –60nA (maximum), as specified in Table 6.6 under "Input bias current" test conditions for LM2902B/LM2902BA devices. This value reflects worst-case leakage across the extended temperature range and ensures stable operation in high-impedance sensor interfaces like thermistor networks or piezoelectric transducers.
Is LM2902KNSR qualified for automotive applications?
No, LM2902KNSR is not AEC-Q100 qualified. It is rated for industrial temperature range (–40°C to +125°C) but lacks automotive-specific stress testing, failure analysis reporting, and PPAP documentation. For automotive use, TI recommends LM2902VQDR (AEC-Q100 Grade 1) or LM2902QPWRQ1 (Grade 0), both of which share the same SOIC-14 package and core specifications as LM2902KNSR.
LM2902KNSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 1.2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 1.4mA (x4 Channels)
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 26 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LM2902KNSR FAQ
1.How can I place an order for LM2902KNSR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2902KNSR 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 LM2902KNSR reliable?
The price and inventory of LM2902KNSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2902KNSR is usually 5 days.
3.What payment methods are accepted for LM2902KNSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2902KNSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2902KNSR?
LM2902KNSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2902KNSR 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 LM2902KNSR?
For technical support, including LM2902KNSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2902KNSR requirements.
6.How does Aetrix verify that LM2902KNSR is sourced from the original manufacturer or authorized distributors?
All LM2902KNSR 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 LM2902KNSR meets industry standards.
7.What is the process for return or replacement of LM2902KNSR?
All LM2902KNSR units undergo pre-shipment inspection (PSI). If there is an issue with LM2902KNSR, 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 LM2902KNSR part is unused and in its original packaging.
Return procedure for LM2902KNSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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