LM258QT - Dual 1.1MHz Op Amp | STMicroelectronics
MPN： LM258QT ✓ 啟用中LM258QT 概覽
An operational amplifier is a high-gain analog signal-conditioning IC that compares differential input voltages and amplifies the result. The LM258QT belongs to the operational amplifier hierarchy, where it combines amplifier signal gain, input protection, frequency compensation, and output-current capability in one package. Its two independent channels make it useful for dual-channel signal paths, instrumentation, transducer amplification, and general-purpose analog control.
Key features include a 1.1 MHz gain-bandwidth product, 0.6 V/µs slew rate, 2 mV input offset voltage, approximately 20 nA input bias current, and 100 dB DC voltage gain. The low-power architecture is intended for operation across a broad supply-voltage range, while internal frequency compensation avoids the need for external compensation components in standard closed-loop configurations.
The two amplifiers are independent, allowing them to amplify different signals or drive separate analog stages. Its 85 dB CMRR helps reject common-mode interference, while its 0.6 V/µs slew rate supports moderate signal slewing requirements. The 1.1 MHz bandwidth is appropriate for low-to-moderate-frequency precision and control circuits rather than high-speed video or RF signal chains.
Typical applications include sensor and transducer signal conditioning, industrial control loops, low-frequency measurement instrumentation, audio preamplification, and general-purpose dual-channel amplification. The two-amplifier configuration can reduce component count when a board needs two related analog functions, provided both channels have compatible signal ranges and grounding requirements.
Designers should preserve the datasheet-recommended bypass capacitance, verify output swing and load-current limits, and account for input common-mode range near the supply rails. The DFN-8 package also requires careful PCB layout, exposed-pad thermal management, and short feedback and input paths to preserve stability and reduce parasitic effects.
This page consolidates verified distributor pricing, package and electrical details, practical application guidance, and pin-compatible replacement information. It also highlights the LM258QT's key engineering trade-offs so purchasing and design decisions can be made against verified source data rather than generic operational-amplifier assumptions.
直接替換替代品，適用於 LM258QT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
LM158QT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM2904QT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM358QT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM2902QT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM258QT 最大額定值與電氣特性
| Amplifier Type | Low-power dual operational amplifier |
| Number of Channels | 2 independent amplifiers |
| Gain-Bandwidth Product | 1.1 MHz |
| Large-Signal Voltage Gain | 100 dB |
| Common-Mode Rejection Ratio | 85 dB |
| Slew Rate | 0.6 V/µs |
| Input Offset Voltage | 2 mV |
| Input Bias Current | 20 nA |
| Input Bias Current at 5 V | 0.2 µA |
| Single-Supply Voltage Range | 3 V to 30 V |
| Dual-Supply Voltage Range | ±1.5 V to ±15 V |
| Nominal Test Supply Voltage | 5 V |
| Frequency Compensation | Internally frequency compensated |
| 工作溫度範圍 | -40 °C to +105 °C |
| 封裝 | 8-DFN, 2 x 2 mm |
| 安裝類型 | Surface mount |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
LM258QT 8-dfn, 2 x 2 mm 腳位配置指南
LM258QT（8-dfn, 2 x 2 mm 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： LM258QT.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM258QT 適用於 6 應用s: Industrial Sensor Signal Conditioning, Transducer and Bridge Amplification, Audio Preamplification, Measurement and Instrumentation, Control Loop and Actuator Drive, Battery-Powered Portable Electronics.
Industrial Sensor Signal Conditioning
The LM258QT fits low-frequency industrial sensor conditioning because each channel provides 100 dB large-signal voltage gain, 85 dB CMRR, and internally compensated operation. Its approximately 20 nA input bias current limits the error introduced when amplifying high-impedance sensor outputs. Two independent amplifiers can condition a differential sensor pair or handle separate reference and measurement channels. The 3 V to 30 V single-supply range supports 5 V and 24 V industrial rails, although engineers must verify the input common-mode range and output swing at the selected supply voltage.
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Transducer and Bridge Amplification
The LM258QT is suitable for bridge or resistive-transducer front ends that operate at low-to-moderate frequencies. Its 85 dB CMRR helps suppress common-mode voltage appearing across sensor inputs, while the two independent channels support differential excitation or dual-stage amplification. The 1.1 MHz gain-bandwidth product and 0.6 V/µs slew rate provide useful bandwidth for typical process-control transducers. Input bias current, offset voltage, resistor matching, and the selected amplifier gain must be evaluated together to prevent low-level bridge signals from being dominated by input-stage error.
推薦
Audio Preamplification
The LM258QT can amplify low-frequency audio signals in compact dual-channel consumer or industrial audio modules. Its 1.1 MHz gain-bandwidth product exceeds the bandwidth of many human-audible signal paths, while its dual architecture supports left and right channels without requiring separate packages. The internally compensated amplifiers simplify closed-loop design, and the 3 V minimum single supply supports portable systems. Designers should still check output swing into the intended load, input coupling method, and system noise because the 2 mV offset specification is not equivalent to a high-performance audio-preamplifier noise rating.
推薦
Measurement and Instrumentation
The LM258QT is appropriate for general-purpose measurement instruments requiring two low-frequency analog channels. Its 100 dB DC gain supports precise closed-loop amplification, and the 85 dB CMRR can improve rejection of interference coupled equally into both inputs. The 3 V to 30 V supply range covers portable, laboratory, and industrial systems. For instrumentation-grade results, verify input offset and bias drift over temperature, resistor stability, leakage from high-impedance nodes, and whether the 1.1 MHz bandwidth is sufficient for the measurement bandwidth and required settling time.
推薦
Control Loop and Actuator Drive
The LM258QT can implement low-frequency error amplifiers and current-control loops in industrial equipment. Two channels allow one amplifier to serve as a feedback error amplifier while the other controls a complementary or auxiliary stage. Its 0.6 V/µs slew rate must be compared with the required actuator signal transition rate, and the 1.1 MHz bandwidth must be sufficient for loop dynamics. For inductive loads, relay drives, or power stages, external current limiting, protection, and output-stage components remain necessary because the LM258QT is a signal amplifier rather than a power driver.
推薦
Battery-Powered Portable Electronics
The LM258QT's low-power dual-amplifier design is useful in battery-powered portable electronics where two analog channels are required but board area is limited. A single 8-DFN package can replace two separate amplifiers, while operation from 3 V supports low-voltage systems. The device also accepts higher single supplies up to 30 V for industrial and automotive-adjacent equipment. Battery life must be estimated from actual supply-current behavior across the operating voltage and load, because only a qualified nominal 5 V operating point is provided in the verified snippets rather than a full current-versus-voltage curve.
推薦
推薦產品摘要
工程參考資料，適用於 LM258QT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LM158QT | LM2904QT | LM358QT | LM2902QT |
|---|---|---|---|---|---|
| Package | 8-DFN, 2 x 2 mm | 8-DFN, 2 x 2 mm | 8-DFN, 2 x 2 mm | 8-DFN, 2 x 2 mm | 8-DFN, 2 x 2 mm |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Amplifier Configuration | Dual operational amplifier | Dual operational amplifier | Dual operational amplifier | Dual operational amplifier | Dual operational amplifier |
主要差異化特點
- Two independent amplifiers in a compact package (對比LM158QT)
- Verified low-voltage single-supply support (對比LM2904QT)
- Established 1.1 MHz bandwidth and 0.6 V/µs slew rate (對比LM358QT)
- Specified 85 dB CMRR and 100 dB DC gain (對比LM2902QT)
設計說明
The LM258QT uses a compact 8-DFN footprint, so place input, output, feedback, and bypass connections close to their associated pins. Keep the feedback loops short to minimize parasitic capacitance and oscillation risk, and route high-impedance input traces away from switching nodes and high-current return paths. Because the supplied sources do not expose the authoritative land pattern or exposed-pad geometry, the PCB footprint must be created from the manufacturer package drawing rather than inferred from a generic DFN-8 template.
Place the required supply bypass capacitor close to the device's supply and ground pins, with a short and low-inductance return path. The LM258QT supports 3 V to 30 V single-supply operation, but the usable input common-mode and output-swing ranges remain dependent on the supply voltage. Confirm those limits in the manufacturer datasheet before using the amplifier near the positive or negative rail, particularly in low-voltage battery-powered equipment.
Use the exposed-pad structure as designed for thermal and electrical performance, following the manufacturer land-pattern guidance for exposed-pad vias and copper. The verified source identifies an 8-DFN package but does not provide a thermal-resistance figure, maximum junction temperature, or exact pad dimensions. Consequently, no unsupported junction-temperature estimate is included; thermal adequacy must be established using the official package data and the amplifier's actual dissipation at the intended output voltage, load, and ambient temperature.
Do not interpret the 5 V supply specification as the maximum operating voltage: the verified operating range is 3 V to 30 V on a single supply. Likewise, the 1.1 MHz gain-bandwidth product is the unity-gain value, not a guaranteed usable bandwidth at every closed-loop gain. Check gain-bandwidth behavior, output swing, load capability, and stability for the selected noise gain rather than assuming the amplifier is suitable for every 1.1 MHz signal at a 100 dB closed-loop gain.
合規資訊
The verified web data does not explicitly state RoHS, REACH, halogen-free, lead-free, conflict-minerals, or automotive qualification status for LM258QT. AEC-Q100 is marked not applicable because this is a general-purpose operational amplifier and no automotive qualification is claimed.
