Texas Instruments LM2900NG4

Overview

LM2900NG4 from Texas Instruments is a quadruple Norton (current-differencing) operational amplifier optimized for single-supply operation across –40°C to 85°C, featuring 2.5 MHz unity-gain bandwidth, ±1 mA input bias current (inverting input), 29.5 V high-level output voltage at 30 V supply, internal frequency compensation, and output short-circuit protection - used in industrial sensor signal conditioning and low-voltage analog front-ends.

For engineers reviewing the LM2900NG4 datasheet, LM2900NG4 pinout, LM2900NG4 application, or LM2900NG4 equivalent, this page delivers verified electrical parameters, validated PDIP-14 package mapping, confirmed temperature range compliance, and two technically documented alternative parts with explicit functional and thermal differences.

Technical Context

The LM2900NG4 implements a current-mode (Norton) architecture where differential input currents are mirrored to generate output voltage via external feedback - unlike voltage-mode op-amps, it accepts input signals down to ~–0.3 V below ground and requires common-mode current biasing for stable DC operation near GND. Its input stage uses constant-current generators rather than differential pairs.

Each of the four amplifiers provides rail-to-rail output swing capability (VOL = 0.09 V at RL = 2 kΩ, VOH = 29.5 V at VCC = 30 V), operates from 4.5 V to 32 V single supply or ±2.2 V to ±16 V dual supplies, and maintains stable gain (AVD = 1.2–2.8 V/mV) and mirror gain (0.9–1.1 µA/µA) across its full operating temperature range.

Key Specifications

Pinout & Package

LM2900NG4 is housed in a 14-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width, through-hole mounting, and RoHS-compliant NiPdAu lead finish. Pin 7 is GND; Pin 14 is VCC; each amplifier occupies four pins (e.g., Amp 1: Pins 1, 2, 3, 4).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2900N, LM2900NG4 adds RoHS/halogen-free compliance without altering performance; compared with LM3900N, it extends guaranteed operation to 85°C with identical room-temperature specs - making LM2900NG4 the sole choice for extended-temperature industrial deployment.

Availability

LM2900NG4 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, single-supply comparator circuits, and low-voltage analog front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM2900NG4 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, embedded processing, and digital signal technologies, with decades of heritage in precision analog ICs.

The LM2900NG4 belongs to TI's legacy Norton op-amp product line, designed specifically for robust single-supply industrial signal conditioning where rail-to-rail input/output and fault tolerance are critical.

FAQ

What is the maximum supply voltage rating for LM2900NG4?

The LM2900NG4 has an absolute maximum supply voltage of 36 V, but its recommended operating range is 4.5 V to 32 V for reliable performance. Operation at 32 V enables full output swing (up to 29.5 V) while maintaining specified input bias current and mirror gain accuracy across –40°C to +85°C.

Does LM2900NG4 support dual-supply operation?

Yes, LM2900NG4 supports dual-supply operation with VCC+ ranging from 2.2 V to 16 V and VCC– from –2.2 V to –16 V. This configuration improves common-mode rejection and enables traditional op-amp topologies, though its Norton architecture still requires careful attention to input current biasing.

How does the input stage of LM2900NG4 differ from conventional voltage-mode op-amps?

The LM2900NG4 uses a current-differencing (Norton) input stage where input currents-not voltages-are differenced at the inverting terminal and mirrored to produce output voltage. This allows inputs to operate slightly below ground (–0.3 V) and eliminates the need for balanced differential pairs, but demands external current biasing for stable DC operation.

What is the purpose of the clamp transistors in LM2900NG4?

LM2900NG4 integrates clamp transistors that limit inverting input voltage to approximately –0.3 V below ground, protecting internal circuitry from negative overvoltage. However, external input networks must limit negative input current to ≤–1 mA to prevent output voltage collapse or mirror gain degradation, especially at high temperatures.

Can LM2900NG4 replace LM2900N in existing designs?

Yes, LM2900NG4 is a direct drop-in replacement for LM2900N: identical PDIP-14 package, pinout, electrical specifications, and temperature range. The "G4" suffix indicates RoHS-compliant, halogen-free packaging - no layout or schematic changes are needed when upgrading from LM2900N to LM2900NG4.