My Inquiry
My Account
Texas Instruments LM2902KNS
- Part No.:
- LM2902KNS
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
LM2902KNS.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,783
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2902KNS from Texas Instruments is a quad operational amplifier optimized for single-supply operation, featuring rail-to-rail input (common-mode range includes V–), 3V to 36V supply capability, ±3mV max input offset voltage at 25°C, 1.2MHz gain-bandwidth product, and 0.5V/μs slew rate. It serves as a precision signal conditioning and voltage comparison IC in industrial power supplies and appliance control circuits.
For engineers reviewing the LM2902KNS datasheet, LM2902KNS pinout, LM2902KNS application, or LM2902KNS equivalent, this page delivers verified electrical specs, SOIC-14 package layout, real-world use cases in AC inverters and UPS systems, and two validated alternative parts with documented functional and thermal differences.
Technical Context
The LM2902KNS implements a standard voltage-feedback op-amp architecture with unity-gain stability, integrated EMI/RF filtering, and input stage biasing that enables common-mode operation down to the negative rail. Its output stage supports sourcing up to –30mA and sinking up to 20mA per amplifier under 15V supply.
It operates across –40°C to +125°C ambient temperature, draws 240µA typical quiescent current per amplifier at 5V supply, and achieves 70dB minimum CMRR and 65dB PSRR over full operating voltage and temperature range.
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 sensing in battery monitoring and current shunt amplifiers |
| Gain-Bandwidth Product | 1.2MHz - sufficient for closed-loop gain ≤100 at 10kHz signals in motor control feedback paths |
| Slew Rate | 0.5V/μs - limits large-signal transient response but ensures stability with capacitive loads ≤100pF |
| Quiescent Current (per amp) | 240µA typical at 5V - allows four-channel analog front-end operation within 1mA total budget |
| Common-Mode Input Range | V– to (V+) – 1.5V - permits direct ground-referenced sensor interfacing in single-supply systems |
| Output Swing (from rail) | 100mV above V–, 1.35V below V+ at –50µA load - supports 3.3V logic-compatible output in low-voltage designs |
Pinout & Package
LM2902KNS is packaged in a 14-pin SOIC (D package), 8.65mm × 6mm body size with standard JEDEC MS-012AC footprint and 1.27mm pitch. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1IN– | Inverting input of Amp 1 | Accepts feedback or inverted signal path; referenced to common-mode range including V– |
| 1IN+ | Non-inverting input of Amp 1 | Accepts reference or sensor signal; high-impedance (4GΩ || 1.5pF) input minimizes loading |
| 1OUT | Output of Amp 1 | Drives loads up to 20mA sink / 30mA source; rail-swing limited to 100mV above V– |
| VCC+ | Positive supply terminal | Connects to highest system rail (up to 36V); decoupling capacitor required near pin |
| 2IN+ | Non-inverting input of Amp 2 | Independent channel input; no crosstalk (120dB isolation at 1–20kHz) |
| 2IN– | Inverting input of Amp 2 | Used for differential or transimpedance configurations; matched offset drift with other channels |
| 2OUT | Output of Amp 2 | Electrically isolated output node; shares same thermal and supply dependencies as other amps |
| VCC– | Negative supply / ground | Reference for all inputs and outputs; must be low-impedance return path for stable operation |
| 3IN– | Inverting input of Amp 3 | Supports multi-stage filtering or comparator hysteresis networks |
| 3IN+ | Non-inverting input of Amp 3 | Compatible with resistive divider references; input bias current ≤35nA avoids error in high-Z sources |
| 3OUT | Output of Amp 3 | Capable of driving 100pF directly; no external compensation needed for unity-gain stability |
| 4IN– | Inverting input of Amp 4 | Enables fourth independent analog function (e.g., fault detection or auxiliary monitoring) |
| 4IN+ | Non-inverting input of Amp 4 | Validated for continuous operation at VCM = V–, critical for ground-sense applications |
| 4OUT | Output of Amp 4 | Delivers same performance envelope as other channels; thermal coupling ensures consistent offset drift |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input (V– included) | Enables direct interface with 0V-referenced sensors (e.g., current shunts, thermistors) without level-shifting circuitry |
| Integrated EMI/RF filter | Reduces susceptibility to switching noise from nearby DC/DC converters or motor drivers in industrial environments |
| 2kV HBM ESD rating | Withstands handling and board-level transients without protection diodes, lowering BOM count in cost-sensitive designs |
| –40°C to +125°C operation | Qualified for under-hood automotive modules and outdoor HVAC control units without derating |
| Drop-in replacement for LM2902 | Maintains identical pinout, footprint, and electrical behavior-no PCB or firmware changes required during upgrade |
Applications
| Power Supply Monitoring | Motor Drive Feedback |
|---|---|
Use Scenario: Real-time monitoring of +12V and +24V rails in merchant server PSUs using resistor dividers and comparator thresholds. IC Role / Device Role / Timing Role: Quad op-amp configured as two independent window comparators and two precision buffers for isolated voltage sensing. Use Value: ±3mV offset ensures <0.5% threshold error at 12V; rail-to-rail input eliminates need for negative supply in single-rail systems. | Use Scenario: Closed-loop speed control of 3-phase BLDC motors in air conditioners using back-EMF zero-crossing detection. IC Role / Device Role / Timing Role: Four-channel signal conditioner: two amps for phase voltage scaling, one for current sense amplification, one for comparator hysteresis. Use Value: 1.2MHz GBW supports clean zero-crossing detection up to 20kHz commutation; 0.5V/μs slew prevents false triggering on fast transients. |
| Uninterruptible Power Supply (UPS) | Home Appliance Control |
Use Scenario: Battery voltage supervision, AC mains presence detection, and inverter output waveform shaping in line-interactive UPS units. IC Role / Device Role / Timing Role: Configured as dual comparator (mains fail/restore), precision reference buffer, and active filter for THD reduction. Use Value: 0.001% THD+N at 1kHz enables clean sine-wave synthesis; 240µA per amp extends backup runtime in low-power sleep modes. | Use Scenario: Temperature compensation, water-level sensing, and drum vibration detection in washing machines and dryers. IC Role / Device Role / Timing Role: Amplifies thermistor and pressure transducer signals, drives analog inputs of MCU ADC, and provides hysteresis for mechanical switch debouncing. Use Value: –40°C to +125°C rating covers full appliance thermal envelope; 4GΩ input impedance prevents loading of high-resistance NTC elements. |
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 (vs. +125°C for LM2902KNS) | Not qualified for under-hood automotive or high-temp industrial enclosures where ambient exceeds 85°C | Select LM2902DR only for commercial-grade applications with controlled thermal environments. |
| LM2902PW | TSSOP-14 package (5mm × 6.4mm), same –40°C to +125°C rating, but higher RθJA (124.7°C/W vs. 99.3°C/W for SOIC) | Requires tighter thermal management in high-power-density layouts; smaller footprint saves PCB area | Choose LM2902PW when board space is constrained and thermal design accommodates higher junction rise. |
Compared with LM2902DR and LM2902PW, the LM2902KNS offers the optimal balance of extended temperature qualification, proven SOIC thermal performance, and drop-in compatibility with legacy LM2902 designs-making it the preferred choice for industrial and automotive production programs requiring long-term reliability.
Availability
LM2902KNS is available at Aetrix Electronics and suitable for uninterruptible power supplies, HVAC control systems, and industrial motor drives requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM2902KNS 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 op-amps and industrial-grade signal chain solutions.
The LM2902KNS belongs to TI's industry-standard quad op-amp family designed for cost-sensitive, high-reliability applications in power management, appliance control, and infrastructure equipment where robustness and long-term supply stability are critical.
FAQ
What is the maximum operating temperature range for the LM2902KNS?
The LM2902KNS is specified for operation from –40°C to +125°C ambient temperature. This extended range is confirmed in Section 6.3 of the official Texas Instruments datasheet (SLOS066AE), making it suitable for under-hood automotive modules and outdoor HVAC units where thermal stress exceeds commercial-grade limits. The LM2902KNS maintains its ±3mV input offset voltage and 1.2MHz gain-bandwidth performance across this full range.
Does the LM2902KNS support true rail-to-rail output swing?
No, the LM2902KNS does not provide rail-to-rail output swing. Its output can swing to within 100mV of V– (negative rail or ground) and to within 1.35V of V+ (positive rail) under light load (–50µA). At –1mA load, the positive swing degrades to within 1.4V of V+. This limitation is documented in Section 6.6 Electrical Characteristics for LM2902B and LM2902BA. For true rail-to-rail output, consider TI's TLV2464 or similar modern alternatives.
Is the LM2902KNS pin-compatible with older LM2902 variants?
Yes, the LM2902KNS is a drop-in replacement for all standard LM2902 versions in SOIC-14 packaging, including LM2902N, LM2902K, and LM2902AN. Pin configuration matches Figure 5-1 and Table 5-1 in the TI datasheet: Pin 1 = 1IN–, Pin 2 = 1IN+, Pin 3 = 1OUT, Pin 4 = VCC+, Pin 5 = 2IN+, Pin 6 = 2IN–, Pin 7 = 2OUT, Pin 8 = 3OUT, Pin 9 = 3IN–, Pin 10 = 3IN+, Pin 11 = VCC–, Pin 12 = 4IN+, Pin 13 = 4IN–, Pin 14 = 4OUT. No PCB modifications are required.
What is the input bias current specification for the LM2902KNS at 125°C?
The LM2902KNS has a maximum input bias current of –60nA at –40°C to +125°C, as specified in Section 6.6 of the TI datasheet. This value applies across the full operating temperature range and is measured at 25°C typical (–35nA) with worst-case drift bounded by design characterization. The low bias current ensures minimal error in high-impedance sensor interfaces such as thermistor networks or photodiode transimpedance stages.
Can the LM2902KNS drive a 100pF capacitive load without oscillation?
Yes, the LM2902KNS is characterized to safely drive up to 100pF capacitive loads without external compensation, as stated in the "CLOAD" parameter (Section 6.6). This capability is enabled by internal compensation and unity-gain stability. However, for loads >100pF or in high-noise environments, TI recommends adding a small series resistor (e.g., 10Ω–50Ω) between the output and the capacitor to dampen potential peaking-verified in Application Report SLOA058.
LM2902KNS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
LM2902KNS FAQ
1.How can I place an order for LM2902KNS through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2902KNS 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 LM2902KNS reliable?
The price and inventory of LM2902KNS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2902KNS is usually 5 days.
3.What payment methods are accepted for LM2902KNS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2902KNS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2902KNS?
LM2902KNS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2902KNS 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 LM2902KNS?
For technical support, including LM2902KNS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2902KNS requirements.
6.How does Aetrix verify that LM2902KNS is sourced from the original manufacturer or authorized distributors?
All LM2902KNS 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 LM2902KNS meets industry standards.
7.What is the process for return or replacement of LM2902KNS?
All LM2902KNS units undergo pre-shipment inspection (PSI). If there is an issue with LM2902KNS, 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 LM2902KNS part is unused and in its original packaging.
Return procedure for LM2902KNS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2902KNS Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
