LM224J4 - Quad 1MHz Operational Amplifier | Texas Instruments
N.º da peça: LM224J4 ✓ AtivoLM224J4 Visão geral
An operational amplifier is a high-gain analog building block that compares two input voltages and amplifies their difference. The LM224J4 belongs to the operational-amplifier hierarchy, which includes voltage-feedback amplifiers, analog signal-conditioning ICs, and broader analog semiconductors. Internally compensated amplifiers simplify closed-loop design because the compensation network is integrated rather than added externally.
The main features of the LM224J4 are its four independent amplifier sections, 1 MHz gain-bandwidth product, 0.5 V/µs slew rate, and internally compensated operation. These characteristics make it appropriate for low-to-moderate frequency signal paths where straightforward voltage feedback, buffering, amplification, and analog comparisons are needed. The 14-CDIP package also provides a through-hole format that is convenient for prototyping, educational equipment, legacy control systems, and industrial maintenance boards.
Each amplifier section provides separate input and output pins, while the IC also exposes shared supply connections. Using multiple amplifiers within one package can reduce board area compared with four separate single-amplifier ICs. The tradeoff is that a fault or excessive power dissipation affecting one section can also affect the shared package, so the complete circuit must be evaluated for supply-current and thermal-budget requirements.
Typical uses include industrial sensor conditioning, low-frequency control loops, current-to-voltage conversion, transducer amplification, audio preamplification, and general-purpose laboratory interfaces. The LM224J4 is particularly useful where a 1 MHz bandwidth is sufficient but a high-speed op amp would add unnecessary cost, complexity, or switching-related demands.
For a new through-hole design, verify the full ordering code, package drawing, supply limits, output-current behavior, input-common-mode range, and temperature grade against the manufacturer datasheet. Decoupling capacitors should be placed close to the supply pins, and unused amplifier sections should be configured according to the manufacturer guidance rather than left floating.
This page combines verified distributor and manufacturer information with package, purchasing, comparison, and practical design guidance. It also distinguishes the LM224J4 from related amplifier and temperature-grade options so engineers can identify a genuine same-package replacement before committing a PCB revision.
Alternativas drop-in para LM224J4 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com LM224J4 (mesmo formato e footprint) — diferindo em Package, Amplifier Type, Mounting Type, Number of Amplifiers, Supply Configuration.
LM224J
✅ Drop-InConsulte o preço
Ver ficha técnica →LM324J
✅ Drop-InConsulte o preço
Ver ficha técnica →LM224AH
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
LM124J
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
LM2902J
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
LM224J4 Classificações máximas e características elétricas
| Number of Amplifier Circuits | 4 circuits |
| Amplifier Type | General Purpose |
| Gain-Bandwidth Product | 1 MHz |
| Slew Rate | 0.5 V/µs |
| Supply Configuration | Single supply |
| Compensation Type | Internally frequency compensated |
| Encapsulamento | 14-CDIP, 0.300 in (7.62 mm) |
| Tipo de montagem | Through-hole |
| Number of Terminals | 14 terminals |
| Package Shape | Rectangular |
| Packaging | Tube |
| Lead Pitch | 0.100 in (2.54 mm) |
Configuração de pinos do LM224J4
| Pino 1 | OUT1 — Output of amplifier 1 |
| Pino 2 | IN1- — Inverting input of amplifier 1 |
| Pino 3 | IN1+ — Non-inverting input of amplifier 1 |
| Pino 4 | V- — Negative supply or ground connection |
| Pino 5 | IN2+ — Non-inverting input of amplifier 2 |
| Pino 6 | IN2- — Inverting input of amplifier 2 |
| Pino 7 | OUT2 — Output of amplifier 2 |
| Pino 8 | OUT3 — Output of amplifier 3 |
| Pino 9 | IN3- — Inverting input of amplifier 3 |
| Pino 10 | IN3+ — Non-inverting input of amplifier 3 |
| Pino 11 | V+ — Positive supply connection |
| Pino 12 | IN4- — Inverting input of amplifier 4 |
| Pino 13 | IN4+ — Non-inverting input of amplifier 4 |
| Pino 14 | OUT4 — Output of amplifier 4 |
Aplicações típicas
LM224J4 é adequado para 6 aplicaçãos: Industrial Sensor Signal Conditioning, Current-to-Voltage Measurement, Audio Preamplifier, Low-Frequency Feedback Control, Data Acquisition Interface, Legacy Test and Measurement Equipment.
Industrial Sensor Signal Conditioning
The LM224J4 is suitable for conditioning low-bandwidth sensor signals in industrial control systems because it integrates four internally compensated amplifiers with a 1 MHz gain-bandwidth product and 0.5 V/µs slew rate. Two sections can amplify a differential sensor output while another section provides an intermediate reference or active filter stage. The 14-CDIP through-hole package simplifies installation on legacy control boards. Designers must verify that sensor excitation, input common-mode range, and output swing remain within the device limits. Input protection and proper grounding are essential when field wiring is exposed to electrical transients.
Recomendado
Current-to-Voltage Measurement
The LM224J4 can implement a current-to-voltage converter for a 4-20 mA instrumentation loop when the measured bandwidth is below its 1 MHz gain-bandwidth capability. One amplifier can buffer the sense resistor, another can amplify the resulting voltage, and the remaining sections can support filtering or reference buffering. Its four general-purpose amplifier circuits reduce component count compared with separate single op amps. For accurate measurements, use a suitable precision sense resistor and confirm input bias current, offset voltage, common-mode range, and output-current limits from the manufacturer datasheet.
Recomendado
Audio Preamplifier
The LM224J4 can provide low-frequency audio preamplification in equipment where 1 MHz bandwidth is sufficient. Its four amplifier sections allow a stereo preamplifier to be implemented with two channels while reserving two sections for input buffering or active tone control. The 0.5 V/µs slew rate supports modest signal amplitudes and avoids the need for a high-speed amplifier when operating well below the device's bandwidth limit. Verify input and output swing, maximum supply voltage, load capability, noise performance, and stability with the selected gain network before finalizing the audio board.
Recomendado
Low-Frequency Feedback Control
The LM224J4 is appropriate for slow feedback loops in process-control, actuator, and laboratory interfaces because each of its four sections can perform amplification, comparison, and active filtering. The 1 MHz gain-bandwidth product provides more bandwidth than most slow control loops require, while 0.5 V/µs slew rate limits how quickly the output can move. Engineers should account for the amplifier's finite output swing, input common-mode range, and phase response when setting loop compensation. The through-hole CDIP package is especially convenient for repairable industrial and educational control boards.
Recomendado
Data Acquisition Interface
The LM224J4 can serve as the analog front end of a low-speed data-acquisition interface by amplifying sensor outputs and buffering inputs before conversion. Four amplifier sections allow a design to combine differential amplification, input conditioning, and reference buffering without using four separate packages. Its 1 MHz gain-bandwidth product is suitable for many sensor and transducer signals but not for high-speed waveform capture. Confirm settling behavior, output drive, and input bias-current effects at the actual gain and bandwidth. The 14-CDIP package is useful for prototype and legacy acquisition hardware.
Recomendado
Legacy Test and Measurement Equipment
The LM224J4 is a practical choice for maintaining or reproducing legacy analog test equipment because four general-purpose amplifiers are available in one 14-CDIP through-hole package. Sections can be assigned to buffer inputs, amplify small signals, generate references, or implement active filters. The 1 MHz bandwidth is suitable for many low-frequency measurement paths but not precision high-speed sampling front ends. Before replacing an existing device, compare pin functions, supply voltage, offset voltage, input bias current, common-mode range, output swing, and temperature grade. The tube package also supports maintenance inventories of older instruments.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LM224J4 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LM224J | LM324J | LM224AH | LM124J | LM2902J |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-CDIP | 14-CDIP - same package | 14-CDIP - same package | 14-CDIP - same package | 14-CDIP - same package | 14-CDIP - same package |
| Mounting Style | Through-hole | Through-hole | Through-hole | Through-hole | Through-hole | Through-hole |
| Number of Circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits |
| Number of Pins | 14 pins | 14 pins | 14 pins | 14 pins | 14 pins | 14 pins |
| Amplifier Type | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose |
| Gain-Bandwidth Product | 1 MHz | 1 MHz | 1 MHz | 1 MHz | 1 MHz | 1 MHz |
| Slew Rate | 0.5 V/µs | 0.5 V/µs | 0.5 V/µs | 0.5 V/µs | 0.5 V/µs | 0.5 V/µs |
| Supply Configuration | Single supply | Single supply | Single supply | Single supply | Single supply | Single supply |
Principais diferenciais
- Combines four general-purpose amplifiers with a 1 MHz bandwidth (vs LM2902J)
- Wide-temperature LM224 family positioning (vs LM324J)
- Single-package integration reduces analog board space (vs LM324J)
- Sufficient speed for general-purpose industrial signal paths (vs LM124J)
Notas de projeto
Place the supply bypass capacitor directly between the V+ and V- pins to minimize supply-loop impedance and prevent coupling between the four amplifier sections. The verified data confirms a single-supply, four-amplifier design but does not provide a verified quiescent-current value, so the exact supply current and capacitor ripple rating must be taken from the manufacturer datasheet. Keep the return-current path short and avoid routing high-current output loads through the sensitive input-reference area.
Do not treat every 14-pin quad op amp as automatically interchangeable. Although LM224J4 and the listed candidates use a 14-CDIP footprint, offset voltage, input bias current, common-mode range, output swing, supply limits, and temperature grade can change the usable circuit. Compare the exact ordering suffix and electrical limits against the original design. Also verify whether pin 4 is designated V- or ground in the selected manufacturer documentation before laying out a board that supports either single or dual supply.
Keep each feedback resistor and its associated amplifier input connection compact to minimize parasitic capacitance and susceptibility to interference. With a 1 MHz gain-bandwidth product and 0.5 V/µs slew rate, the device is normally used in low-frequency circuits, but large feedback loops can still oscillate or produce peaking. Follow the manufacturer stability guidance for the selected noise gain, and provide a defined common-mode or reference connection for any unused amplifier section.
Calculate dissipation from the actual supply voltage, output voltage, quiescent current, and load current using the verified electrical limits before applying the operating temperature. The 14-CDIP package provides a through-hole thermal path, but the supplied excerpts do not include thermal resistance or exact quiescent current. Therefore, no numerical temperature-rise estimate is claimed here. Use the manufacturer's thermal data and the board's copper area to determine whether the package requires additional thermal management.
Informações de conformidade
The supplied verified excerpts identify the package, amplifier type, circuit count, bandwidth, slew rate, and single-supply operation but do not provide explicit RoHS, REACH, halogen-free, lead-free, or conflict-minerals statements.
