LM258AH - Dual 30V Low-Power Op Amp | STMicroelectronics
N.º de pieza: LM258AH ✓ ActivoLM258AH Descripción general
An operational amplifier, or op amp, is a high-gain analog building block used to amplify small voltage signals. Within the wider semiconductor hierarchy, the LM258AH is an analog integrated circuit and a dual operational amplifier. Its two independent channels can support signal conditioning, feedback control, voltage comparison, and general-purpose analog amplification without requiring a split-supply arrangement.
The key features of the LM258AH include two amplifiers in one package, internal frequency compensation, and a maximum input voltage of 30 V. The LM258 family is designed around a 700 kHz gain-bandwidth characteristic, while the LM258A version has an input offset voltage specified as 3 mV by the cited manufacturer information. The low-power architecture is intended for applications that require wider supply-voltage tolerance than conventional low-voltage single-supply op amps.
The internally compensated architecture simplifies closed-loop amplifier design because it avoids the external compensation components normally required by higher-gain parts. Independent channels may also be used for unrelated signal paths, although common supply pins mean both channels share the same operating rail and thermal environment. Designers should still verify output swing, input common-mode range, output-current capability, and stability against their actual source and load impedances.
Typical uses include industrial process-control loops, sensor-signal conditioning, low-frequency filter stages, comparators, and general analog signal chains. The wide operating-voltage capability can simplify legacy and industrial designs that operate from higher single rails. The 700 kHz bandwidth is appropriate for low-frequency precision and control tasks, but it is generally not the preferred choice for high-speed video, RF, or wideband data-acquisition requirements.
The principal design considerations are supply decoupling, input common-mode limits, output swing, and thermal behavior. Place the supply bypass capacitor close to the device and avoid driving outputs into hard clamps except where the application intentionally requires saturation. Verify the complete circuit against the STMicroelectronics LM258 datasheet, particularly for AC output current, noise, offset voltage, and load-capacitance stability.
This product page consolidates the verified manufacturer and distributor information for the LM258AH and distinguishes the TO-99-8 metal-package option from surface-mount and other package variants. It also provides compatibility-focused replacement guidance, practical circuit considerations, and a specification comparison structured around engineers evaluating an existing TO-99-8 dual-op-amp design.
Alternativas directas para LM258AH — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con LM258AH (mismo factor de forma y huella) — difiere en Package.
LM258H
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Ver hoja de datos →LM258AH Valores máximos y características eléctricas
| Amplifier Type | Dual operational amplifier |
| Number of Channels | 2 independent channels |
| Maximum Supply Voltage | 30 V |
| Gain-Bandwidth Product | 700 kHz |
| Input Offset Voltage | 3 mV for the LM258A family |
| Rango de temperatura de funcionamiento | -25 °C to +85 °C |
| Supply Type | Single-supply operation |
| Compensation | Internally frequency compensated |
| Encapsulado | TO-99-8 metal package |
| Package Code | TO-99 |
| Terminal Count | 8 terminals |
| Terminal Form | Wire |
| Tipo de montaje | Through-hole metal can |
| Temperature Grade | Industrial |
Guía de configuración de pines de LM258AH to-99
Configuración de pines para LM258AH (encapsulado to-99). Este componente analógico presenta pines de entrada, salida y alimentación. Consulte la hoja de datos del fabricante para conocer las configuraciones de los pines de ajuste de offset, compensación y habilitación. Ideal para circuitos de acondicionamiento de señal y amplificadores.
No hay datos detallados de patillaje disponibles para LM258AH.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
LM258AH es adecuado para 6 aplicacións: Industrial Sensor Signal Conditioning, Low-Frequency Voltage Comparator, Precision Active Filter, Process Control Feedback Loop, Legacy Instrumentation Amplification, Power-Supply Monitoring.
Industrial Sensor Signal Conditioning
The LM258AH is suitable for conditioning sensors that operate from an industrial 24 V supply because the LM258 family supports input voltages up to 30 V. Its two independent, internally compensated channels can amplify and level-shift a low-level sensor signal when the chosen operating point remains inside the input common-mode range. The 700 kHz gain-bandwidth characteristic is sufficient for many slow process-control signals, while the -25 °C to +85 °C industrial grade supports wider ambient conditions. Designers must still verify the output swing, sensor grounding method, and protection network, because those circuit details determine whether the amplifier can saturate or lose accuracy.
Recomendado
Low-Frequency Voltage Comparator
The LM258AH can implement a low-frequency comparator by applying positive feedback around one of its two internally compensated amplifier channels. Its 700 kHz gain-bandwidth product provides useful response for many control and threshold-detection tasks, while the wide 30 V input-voltage capability is useful for industrial signals. The circuit should include controlled input attenuation when the compared voltage can exceed the amplifier’s permitted common-mode range. Output-device drive and propagation behavior also require confirmation in the manufacturer datasheet, particularly when the comparator output drives a relay, relay driver, or long cable.
Recomendado
Precision Active Filter
The LM258AH’s two independent channels are convenient for building second-order active-filter stages or separate low-pass and high-pass sections. Its 700 kHz gain-bandwidth product leaves useful bandwidth for audio-band and slow industrial-control signals, and internal frequency compensation simplifies many closed-loop configurations. Component tolerances, input and output loading, and the op amp’s gain-bandwidth behavior will influence the achieved filter response, so simulated values should be checked against real test conditions. The TO-99-8 metal package also provides a physically robust through-hole option for legacy or repair-oriented control boards.
Recomendado
Process Control Feedback Loop
The LM258AH can serve as the error amplifier in a slow process-control loop where the controller output adjusts an actuator according to a feedback signal. The dual package allows one channel to perform error amplification while the other handles an auxiliary monitoring or threshold function. Its maximum 30 V input-voltage capability is helpful in 24 V industrial systems, although the actual output must remain inside the specified swing and common-mode limits. Designers should add output isolation if the actuator can present capacitive loads, because stable feedback operation depends on load compatibility and correct compensation.
Recomendado
Legacy Instrumentation Amplification
The LM258AH can amplify low-level instrumentation signals in legacy test and measurement equipment when the source impedance and frequency content are compatible with the 700 kHz gain-bandwidth product. Its two independent channels allow simultaneous measurement or reference amplification without changing the established TO-99-8 footprint. Instrumentation accuracy still depends on input bias current, offset drift, noise, and resistor matching, none of which can be quantified from the supplied search excerpts. A practical design should therefore provide input-bias-current compensation, guard or shield routing where appropriate, and calibration provisions for offset and gain error.
Recomendado
Power-Supply Monitoring
The LM258AH can monitor a regulated rail or generate an analog error signal by comparing a divided feedback voltage with a reference. The wide 30 V input-voltage rating is especially useful when the sensing point comes from a 24 V bus, provided attenuation keeps the amplifier within its common-mode range. One channel may perform the comparison while the second monitors another rail or supplies a buffered threshold. A monitor intended to protect equipment should also include a separate shutdown path, because relying on the analog op amp alone does not guarantee a defined response time or a failsafe state during power loss.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LM258AH — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LM258H |
|---|---|---|
| Manufacturer | STMicroelectronics | Texas Instruments |
| Package | TO-99-8 metal package | TO-99-8 metal package |
| Amplifier Configuration | Dual operational amplifier | Dual operational amplifier |
| Terminal Count | 8 terminals | 8 terminals |
| Availability | Current distributor listings available | DigiKey listing available |
Diferenciadores clave
- Maintains the established STMicroelectronics procurement path (frente a LM258H)
- Verified industrial TO-99-8 configuration (frente a LM258H)
- Wide supply and established dual-channel architecture (frente a LM258H)
Notas de diseño
The LM258AH supports single-supply operation up to the cited 30 V input-voltage limit, but that rating is not a substitute for checking the output swing. In a 24 V control system, keep both amplifier inputs inside the specified common-mode range and ensure the output does not exceed its allowed swing under the intended load. Add a local bypass capacitor near the supply pins to control supply noise and prevent feedback-loop instability.
Do not assume that identical TO-99-8 packages guarantee identical behavior. Before replacing an LM258AH with LM258H, compare offset voltage, input bias current, common-mode range, output swing, output-current capability, noise, slew rate, quiescent current, and load-capacitance stability. The verified search excerpts establish package compatibility but do not quantify all electrical differences, so the manufacturer datasheets remain the controlling documents.
Preserve the original TO-99-8 lead geometry and verify the socket or PCB hole pattern against the manufacturer drawing before assembly. Keep the power and ground returns short, place bypass capacitance close to the device, and route high-impedance input traces away from switching nodes and relay-driver outputs. The metal package can improve thermal robustness, but adequate copper and airflow still determine the achievable temperature rise.
Información de cumplimiento
The supplied search results identify an industrial-grade LM258AH but do not extract RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. These fields remain unknown rather than being inferred from the manufacturer or package.
