LM258AD - Dual 30V 700kHz Op Amp | Texas Instruments
N.º de pieza: LM258AD ✓ ActivoLM258AD Descripción general
An operational amplifier is an analog signal-conditioning IC that uses high open-loop gain to amplify the difference between voltages applied to its inverting and non-inverting inputs. The LM258AD belongs to the operational-amplifier family within the broader linear-amplifier and analog-signal-processing hierarchy. Its internally frequency-compensated architecture eliminates the need for an external compensation capacitor in typical closed-loop configurations.
Key features include a large DC voltage gain of 100 dB, a 1.1 MHz unity-gain bandwidth, low input bias current of 20 nA, and supply current that remains essentially independent of supply-voltage magnitude. The two amplifiers can be used in non-inverting, inverting, comparator, summing, difference, and general feedback configurations. The single-supply capability also supports battery-powered and industrial signal-conditioning equipment.
Each amplifier is intended for operation over a wide supply range, with the verified manufacturer description identifying a 30 V maximum supply voltage and a -25°C to 85°C operating-temperature range. Internal frequency compensation makes the device suitable for straightforward fixed-gain implementations without an additional compensation network. Engineers should still account for input common-mode limits, output swing, stability, input offset, and output-current limitations according to the manufacturer datasheet.
Typical applications include transducer and sensor-signal conditioning, low-current industrial control, audio preamplification, bridge-amplifier interfaces, and power-supply feedback networks. The dual configuration saves board area when two low-frequency analog channels are required. Compared with a switching regulator or a modern rail-to-rail amplifier, the LM258AD prioritizes low quiescent current, wide supply-voltage headroom, and straightforward single-supply operation.
When laying out the circuit, keep input and feedback paths short and place compensation or filtering capacitors close to their associated pins when required by the selected topology. Check output-current demand and input common-mode range against the actual supply voltage. Do not assume rail-to-rail input or output behavior; the available headroom and output swing are important constraints in low-voltage designs.
This page consolidates the verified manufacturer specifications, distributor availability information, package details, and practical selection guidance. It also distinguishes pin-compatible alternatives from merely similar amplifiers and highlights missing electrical data explicitly rather than estimating values that are not established by the supplied sources.
Alternativas directas para LM258AD — 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 LM258AD (mismo factor de forma y huella) — difiere en Operating Temperature Range, Package, Gain-Bandwidth Product, Maximum Supply Voltage, Amplifier Type.
LM358AD
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Ver hoja de datos →LM258AD Valores máximos y características eléctricas
| Product Type | Dual operational amplifier |
| Number of Amplifiers | 2 circuits |
| Maximum Supply Voltage | 30 V |
| Gain-Bandwidth Product | 700 kHz |
| Unity-Gain Bandwidth | 1.1 MHz |
| DC Voltage Gain | 100 dB |
| Supply Current per Amplifier | 500 uA |
| Input Bias Current | 20 nA |
| Compensation | Internally frequency compensated |
| Rango de temperatura de funcionamiento | -25°C to 85°C |
| Encapsulado | 8-pin SOIC |
| Tipo de montaje | Surface mount |
| Supply Configuration | Single supply |
Configuración de pines de LM258AD
| Pin 1 | OUT1 — Output of amplifier 1 |
| Pin 2 | IN1- — Inverting input of amplifier 1 |
| Pin 3 | IN1+ — Non-inverting input of amplifier 1 |
| Pin 4 | V- — Negative supply or ground connection |
| Pin 5 | IN2+ — Non-inverting input of amplifier 2 |
| Pin 6 | IN2- — Inverting input of amplifier 2 |
| Pin 7 | OUT2 — Output of amplifier 2 |
| Pin 8 | V+ — Positive supply connection |
Aplicaciones típicas
LM258AD es adecuado para 6 aplicacións: Industrial Sensor Signal Conditioning, Audio Preamplifier and Mixer Stage, RS-232 Interface Support Circuit, Power Supply Feedback and Monitoring, Transducer and Bridge Signal Interface, Portable Battery-Powered Control Circuit.
Industrial Sensor Signal Conditioning
The LM258AD fits low-frequency industrial sensor conditioning because its two internally frequency-compensated amplifiers can process complementary or sequential channels without requiring external compensation capacitors. The verified 30 V maximum supply rating supports relatively wide industrial input ranges, while approximately 500 uA supply current per amplifier is useful in distributed or power-limited measurement systems. Use one section for amplification and the other for filtering or buffering, while checking the input common-mode range and output swing against the sensor signal. The -25°C to 85°C operating range covers many industrial environments, but it does not by itself establish AEC-Q100 qualification.
Recomendado
Audio Preamplifier and Mixer Stage
The LM258AD can serve in modest-bandwidth audio preamplifier or mixer circuits where low power and single-supply operation matter more than rail-to-rail access or high slew rate. Its verified 1.1 MHz unity-gain bandwidth supports the low and mid-frequency range, while the dual 500 uA-per-amplifier power draw helps limit consumption in portable audio equipment. The 30 V supply ceiling also permits compatibility with higher-voltage analog rails. Its input bias current of 20 nA is favorable for higher-impedance sources, although actual noise, offset, output swing, and stability must be verified from the manufacturer datasheet.
Recomendado
RS-232 Interface Support Circuit
The LM258AD is suitable for auxiliary amplification, level conditioning, and threshold functions around RS-232 interface circuitry because its low-power dual architecture fits compact control boards. The two amplifier sections can handle separate analog tasks, such as conditioning a receiver-related signal and amplifying a control feedback signal, without requiring two packages. The 30 V maximum supply rating provides headroom above common interface supply levels, while the 1.1 MHz unity-gain bandwidth exceeds the bandwidth needed by many UART-rate links. The interface transceiver still controls the actual RS-232 line levels, so LM258AD should not be treated as a direct line-driver substitute.
Recomendado
Power Supply Feedback and Monitoring
The LM258AD can monitor a power rail or form part of a feedback and fault-detection network in higher-voltage industrial equipment because it is specified up to a 30 V maximum supply. One internally compensated amplifier may amplify a scaled feedback voltage, while the other can compare that signal with a reference or provide an additional buffered output. The 700 kHz gain-bandwidth product is adequate for slow control loops rather than high-frequency compensation. Designers must observe the input common-mode range and output-swing limits at the selected supply voltage and provide suitable resistor scaling and protection for transient industrial conditions.
Recomendado
Transducer and Bridge Signal Interface
The LM258AD is applicable to low-frequency bridge or transducer interfaces where two amplifier channels are useful and battery or sensor power is constrained. Its verified input bias current of 20 nA helps limit loading of high-resistance sensing elements, while the low 500 uA-per-amplifier supply current supports portable instrumentation. The dual package can implement a differential stage or separate gain and filter functions. Because the LM258AD is not specified as rail-to-rail, the bridge excitation and sensor output must remain inside its allowable common-mode range, and input protection should account for external transients before they reach the amplifier pins.
Recomendado
Portable Battery-Powered Control Circuit
The LM258AD is appropriate for low-duty-cycle battery-powered control and measurement platforms because its approximately 500 uA supply current per amplifier is low, and the verified family data says supply drain is essentially independent of supply-voltage magnitude. Two amplifiers in one 8-pin SOIC reduce component count for compact analog conditioning. The device can also operate from a single supply, simplifying system architecture compared with a dual-supply requirement. Designers should account for the actual battery voltage, output swing, input common-mode headroom, and quiescent-current path when calculating runtime; the 30 V maximum rating does not imply useful operation down to zero volts.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LM258AD — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Consider the LM358AD when its independently verified electrical limits better fit a lower-voltage design or when a second source is needed in the same 8-pin SOIC footprint. The supplied cross-reference information identifies consistent terminals and closely related performance, but the input common-mode range, output swing, offset, and qualification must still be checked.
The STMicroelectronics LM258AD is an exact same-code option, while the STMicroelectronics LM358AD provides a related 8-pin SOIC alternative. Manufacturer identity matters because the ordering code can be supplied by more than one company. Do not select an alternative solely from the package name, and do not use the alternative list as a substitute for reviewing the exact manufacturer datasheet, especially in automotive, medical, or high-voltage installations.
Comparación con alternativas
| Parámetro | Este producto | LM358AD | LM358AD | LM258AD |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | STMicroelectronics | STMicroelectronics |
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Amplifier Count | 2 | 2 | 2 | 2 |
| Maximum Supply Voltage | 30 V | 36 V | 36 V | 30 V |
| Gain-Bandwidth Product | 700 kHz | 700 kHz | 700 kHz | 700 kHz |
| Unity-Gain Bandwidth | 1.1 MHz | 1 MHz | 1 MHz | 1.1 MHz |
| DC Voltage Gain | 100 dB | 100 dB | 100 dB | 100 dB |
| Supply Current per Amplifier | 500 uA | 500 uA | 500 uA | 500 uA |
| Input Bias Current | 20 nA | 20 nA | 20 nA | 20 nA |
| Operating Temperature Range | -25°C to 85°C | -25°C to 85°C | -25°C to 85°C | -25°C to 85°C |
Diferenciadores clave
- Higher specified maximum supply rating than LM358AD alternatives (frente a LM358AD)
- Slightly higher verified unity-gain bandwidth (frente a LM358AD)
- Dual internally compensated channels in one package (frente a MC1458D)
Notas de diseño
Budget the LM258AD supply requirement using the verified approximately 500 uA per amplifier, so the two-amplifier device can require roughly 1 mA from the supply under the stated family conditions before output-current and external-circuit demand are added. Because the family is designed for single-supply use, connect the supply and ground according to the manufacturer pinout and avoid treating the 30 V rating as a guaranteed operating range at every rail voltage.
Keep non-inverting inputs, inverting inputs, and feedback components close to their associated LM258AD pins to reduce capacitive pickup and unwanted feedback. For high-impedance sensor inputs, use a compact layout, guard or shield sensitive traces where appropriate, and avoid routing switching-node copper beneath the amplifier inputs. The 20 nA input-bias-current specification is useful, but PCB leakage and contamination can still dominate very high-impedance designs.
Do not assume that the 30 V maximum supply rating implies rail-to-rail input or output operation. Confirm the datasheet input common-mode range and output swing at the actual supply voltage before selecting resistor values. A zero-dollar JSON offer and tier table are placeholders because verified prices were unavailable; likewise, obtain a live quotation and lead time rather than relying on the placeholder values when placing an order.
For stable operation, select feedback values according to the manufacturer's recommended topology and verify the intended closed-loop gain against the 700 kHz gain-bandwidth product and 1.1 MHz unity-gain bandwidth. The device is internally frequency compensated, so an external compensation capacitor is normally unnecessary, but an output load, sensor capacitance, or added feedback network can still change frequency response. Validate the final circuit across its required signal and temperature range.
Información de cumplimiento
The supplied verified sources do not explicitly state material-compliance or automotive-qualification declarations for LM258AD. These fields remain unknown rather than being inferred from package type or operating-temperature range.