Texas Instruments LM2902KN

Overview

LM2902KN 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 30V supply capability, ±7 mV max input offset voltage at 25°C, 1.2 MHz gain-bandwidth product, and 0.5 V/μs slew rate. It serves as a general-purpose signal conditioning and amplification IC in industrial power supplies, motor control feedback loops, and sensor interface circuits.

For engineers reviewing the LM2902KN datasheet, LM2902KN pinout, LM2902KN application, or LM2902KN equivalent, key selection criteria include its extended temperature range (–40°C to +125°C), low quiescent current (240 µA per amplifier), integrated EMI filtering, and compatibility with legacy LM2902 designs requiring drop-in replacement capability without layout changes.

Technical Context

The LM2902KN implements four independent high-voltage op-amps in a single monolithic IC, each with unity-gain stability and internal frequency compensation. Its input stage supports common-mode voltages down to the negative rail (V–), enabling true single-supply operation in systems where ground-referenced inputs are required.

It delivers 25 V/mV minimum open-loop gain across –40°C to +125°C, maintains ≥65 dB PSRR and CMRR over full operating conditions, and drives capacitive loads up to 100 pF while sustaining phase margin ≥56° - critical for stable closed-loop performance in precision analog front-ends.

Key Specifications

Pinout & Package

LM2902KN is supplied in a 14-pin PDIP (Plastic Dual In-line Package) measuring 19.3 mm × 9.4 mm, suitable for through-hole prototyping and legacy industrial PCB assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad operational amplifier applications.

Compared with LM2902N and LM2902DR, the LM2902KN uniquely combines through-hole manufacturability, extended temperature qualification, and legacy LM2902 pinout - making it the sole option for upgrading existing industrial control boards without layout revision or thermal derating.

Availability

LM2902KN is available at Aetrix Electronics and suitable for industrial power supply units, motor control systems, and automotive climate control modules requiring stable component supply across long production lifecycles.

Supply support for LM2902KN 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 over 90 years of innovation in high-reliability analog ICs.

The LM2902 family was designed specifically for cost-sensitive, high-volume industrial and automotive applications demanding robust performance across extreme temperatures and noisy electrical environments.

FAQ

What is the maximum supply voltage for LM2902KN?

The absolute maximum supply voltage for LM2902KN is 32 V, but the recommended operating range is 3 V to 30 V. Operation above 30 V risks exceeding safe junction temperature limits and may degrade long-term reliability, especially at elevated ambient temperatures. The LM2902KN datasheet specifies 30 V as the upper limit for guaranteed parametric performance across –40°C to +125°C.

Does LM2902KN support rail-to-rail output swing?

No, LM2902KN does not provide rail-to-rail output swing. Its output can swing within 1.5 V of the positive rail (V+) and as low as 5–20 mV above the negative rail (V–) depending on load current. For example, with VCC+ = 12 V and VCC– = 0 V, the output typically reaches 10.5 V (high) and 0.02 V (low) at 1 mA load. This limited swing is consistent across all four amplifiers in the LM2902KN package.

Can LM2902KN replace LM324 in existing designs?

LM2902KN is not a direct replacement for LM324 due to differences in supply voltage range and temperature rating: LM324 operates up to 36 V and is rated for 0°C to +70°C, while LM2902KN is limited to 30 V and qualified for –40°C to +125°C. Although pinout and basic functionality match, substituting LM2902KN into an LM324 design requires verification of supply headroom and thermal margins - particularly in high-voltage or commercial-temperature applications.

What is the input bias current specification for LM2902KN at 125°C?

The input bias current for LM2902KN is specified as ≤ –60 nA (maximum) across the full operating temperature range of –40°C to +125°C. This value reflects worst-case leakage at high temperature and ensures predictable behavior in high-impedance sensor interfaces, such as thermistor networks or photodiode transimpedance amplifiers, where bias current directly impacts offset and stability.

Is LM2902KN RoHS compliant and lead-free?

Yes, LM2902KN is RoHS compliant and lead-free. Texas Instruments certifies this part as meeting JEDEC J-STD-609 Class 3 marking requirements for lead-free terminations, with SnAgCu (SAC305) solder finish on all leads. The PDIP package uses matte tin plating over copper leadframe, and full compliance documentation is available in TI's official product change notices and material declarations for LM2902KN.