LM248DT - Quad 1.3 MHz UA741 Op Amp | STMicroelectronics
料号： LM248DT ✓ 量产中LM248DT 概述
An operational amplifier is an analog integrated circuit that uses high open-loop gain and negative feedback to amplify small voltage signals. A quad operational-amplifier package contains four amplifiers, allowing a design to implement four independent signal-processing channels while reducing board area and package count. Within the product hierarchy, the LM248DT is a bipolar operational amplifier, a general-purpose analog IC, and a member of the broader amplifier and signal-conditioning category.
The LM248DT's Class AB output stage avoids crossover distortion, making it useful where low distortion is preferred over the lower output-current capability associated with CMOS amplifiers. Its internally compensated architecture simplifies closed-loop design without external compensation networks. Low input offset voltage supports precision-feedback applications, while the low input bias and offset currents reduce error in source impedances that are not extremely low.
The four amplifiers operate independently, providing internal isolation between channels and allowing simultaneous use in unrelated circuit blocks. The 1.3 MHz gain-bandwidth product supports moderate-bandwidth signal amplification and active filtering, while the 0.5 V/µs slew rate is suitable for general-purpose waveform and feedback tasks. Because bipolar inputs can require more input-bias current than CMOS input amplifiers, source impedance and input-common-mode headroom should be checked against the manufacturer datasheet.
Typical uses include industrial process-control loops, instrumentation amplifiers, sensor conditioning, active filters, transducers, and general-purpose analog signal chains. Four amplifiers in one package can be allocated to instrumentation stages, filters, and buffer functions. In designs requiring rail-to-rail input or output behavior, very low supply voltage, or rail-to-rail output drive, a modern precision CMOS amplifier may be more appropriate.
When designing around the LM248DT, verify the supply-voltage range, input common-mode range, output swing, operating-temperature grade, and package pinout against the manufacturer datasheet. Decoupling capacitors should be placed close to the supply pins, and unused amplifier channels should be configured according to the datasheet rather than left floating. A common-mode input beyond the specified range can cause input-stage saturation and loss of normal operation.
This page combines verified manufacturer and distributor information with pin-compatible alternatives, practical selection guidance, application analysis, and engineering design notes. It is intended to help engineers identify whether the LM248DT fits a legacy or new analog circuit without relying on undocumented assumptions about electrical limits, stock, or cross-references.
直接替换替代料： LM248DT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LM248DT （相同外形与封装尺寸） ——差异在于 Package, Number of Amplifiers, Amplifier Type, Architecture, Gain-Bandwidth Product.
LM348D
✅ 直接替换📋 参考替代料（不在目录中）
LM248D
✅ 直接替换联系询价
查看数据手册 →LM248DR
✅ 直接替换联系询价
查看数据手册 →LM224DR
✅ 直接替换联系询价
查看数据手册 →LM324D
✅ 直接替换联系询价
查看数据手册 →LM248DT 最大额定值与电气特性
| Amplifier Type | Quad general-purpose bipolar operational amplifier |
| Number of Amplifiers | 4 circuits |
| Gain-Bandwidth Product | 1.3 MHz |
| Slew Rate | 0.5 V/µs |
| Supply Current per Amplifier | 0.53 mA |
| Input Offset Voltage | 1 mV maximum |
| Input Offset Current | 2 nA maximum |
| Input Bias Current | 30 nA maximum |
| Compensation | Internally compensated |
| Output Stage | Class AB |
| Crossover Distortion | No crossover distortion |
| Pin Compatibility | Compatible with LM224 and LM324 |
| Amplifier Isolation | High degree of isolation between amplifiers |
| 封装 | 14-pin SOIC |
| 安装类型 | Surface mount |
LM248DT 14-pin soic 引脚配置指南
LM248DT（14-pin soic 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： LM248DT.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM248DT 适用于 6 应用s: Industrial Sensor Signal Conditioning, Active Filters and Audio Control Loops, Instrumentation and Transducer Interfaces, Power-Supply Feedback and Regulation Control, Process-Control Analog Front Ends, Legacy Control and Measurement Boards.
Industrial Sensor Signal Conditioning
The LM248DT fits four-channel industrial sensor conditioning because its 1 mV maximum input offset voltage and 2 nA maximum input offset current limit static error around sensor amplifiers and feedback networks. Each of the four amplifiers is independent and internally compensated, allowing the package to combine current-to-voltage conversion, gain stages, filtering, and output buffering without selecting separate devices. The 1.3 MHz gain-bandwidth product supports moderate-bandwidth control loops, while the 30 nA maximum input bias current is useful with relatively high sensor-source impedances. Designers must verify the input common-mode range and output swing at the actual supply voltage. Industrial designs should also keep input traces away from motor and relay wiring and use the manufacturer-recommended bypassing to prevent switching transients from modulating the sensor signal.
推荐
Active Filters and Audio Control Loops
The LM248DT is appropriate for active-filter and audio-control designs requiring four amplifiers with predictable low-frequency behavior. Its verified 1.3 MHz gain-bandwidth product and 0.5 V/µs slew rate provide useful response for audio-band filters, tone controls, and feedback networks, while the Class AB output stage avoids crossover distortion. Four independent channels can implement a two-stage filter plus buffer and spare conditioning paths in one 14-pin SOIC. Because bipolar input bias current can create errors with very high source impedances, the design should account for the verified 30 nA maximum input bias current. Output swing and input common-mode limits must remain inside the manufacturer-rated envelope, and the PCB should provide short feedback routes and solid ground-plane connectivity.
推荐
Instrumentation and Transducer Interfaces
The LM248DT can support instrumentation and transducer interfaces where four coordinated amplifiers reduce component count and preserve a common package family. Its 1 mV maximum input offset voltage supports precision feedback around resistive transducers, and 2 nA maximum input offset current helps limit differential-input error. The 1.3 MHz gain-bandwidth product is sufficient for many low- and mid-band measurement systems rather than high-speed signal-front-end instrumentation. A practical arrangement can use two amplifiers for a difference stage and two for gain and output buffering, although exact topology depends on source impedance and common-mode range. The verified excerpts do not provide complete input-range data, so engineers should check the official datasheet before selecting resistor ratios or operating near a supply rail.
推荐
Power-Supply Feedback and Regulation Control
The LM248DT can be used in power-supply error-amplifier and feedback-control circuits where its high-gain, internally compensated architecture and 1.3 MHz gain-bandwidth product suit moderate loop bandwidth. One channel can compare a feedback voltage with a reference, while another channel can provide compensation, filtering, or auxiliary drive. The Class AB output stage avoids crossover distortion around the control signal, and the verified 0.53 mA per-amplifier supply current allows multiple amplifiers to be used without excessive quiescent demand. Designers must account for the exact common-mode input range, output swing, and stability behavior in the selected topology. Feedback traces should be short, the power-stage ground return should not share noisy switching paths, and supply bypassing should follow the official application guidance.
推荐
Process-Control Analog Front Ends
The LM248DT is well suited to process-control analog front ends that require several gain and buffering functions around slowly varying plant signals. The 1 mV offset-voltage limit supports tighter closed-loop accuracy than a generic unspecified quad amplifier, while the 1.3 MHz gain-bandwidth product is more than adequate for many temperature, pressure, and position loops. Four channels can handle sensor conditioning, error amplification, filtering, and actuator buffering while maintaining consistent pinout. The input-bias current of 30 nA maximum should be considered with resistive sensors and long input traces. Field-oriented equipment also needs careful grounding, shielding, and separation from relays, switching supplies, and motor drivers to prevent common-mode or conducted noise from affecting the control signal.
推荐
Legacy Control and Measurement Boards
The LM248DT is particularly useful for repairing or updating legacy control and measurement boards because the manufacturer datasheet confirms pin compatibility with the LM224 and LM324 families. Its four independent amplifiers can replace a dispersed collection of single or dual amplifiers while preserving the familiar 14-pin SOIC footprint. The 1.3 MHz gain-bandwidth product and 0.5 V/µs slew rate support general-purpose analog functions, while 1 mV maximum input offset voltage supports feedback accuracy. Before substitution, verify the original board's supply voltage, common-mode range, required output swing, and operating temperature because those limits are not fully included in the supplied excerpts. A footprint match alone does not guarantee that a different family variant preserves every original design assumption.
推荐
推荐产品汇总
工程参考数据： LM248DT ——对比、设计指导和合规信息。
选型指南
Choose LM348D when its individual datasheet confirms a better match for common-mode range, bias behavior, or availability while preserving the 14-pin footprint. Choose TI LM248DR when an active cross-brand 14-pin replacement is acceptable and its verified 1 MHz gain-bandwidth product remains sufficient. LM224DR and LM324D are useful when the board was originally designed around the explicitly pin-compatible LM224 or LM324 family. In every substitution, confirm supply voltage, common-mode input range, output swing, operating temperature, offset limits, and stability. A modern CMOS amplifier is preferable when rail-to-rail operation, very low voltage, or substantially lower input bias current is essential.
与替代料对比
| 参数 | 本产品 | LM348D | LM248D | LM248DR | LM224DR | LM324D |
|---|---|---|---|---|---|---|
| Package | 14-pin SOIC | 14-pin SOIC - same | 14-pin SOIC - same | 14-pin SOIC - same | 14-pin SOIC - same | 14-pin SOIC - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments | Texas Instruments | Texas Instruments |
| Amplifier Count | 4 | 4 | 4 | 4 | 4 | 4 |
| Pin Compatibility | Compatible with LM224 and LM324 | Consistent terminals and packages per supplied comparison | Same LM248 family and package | 14-pin replacement footprint | Explicitly compatible with LM248 | Explicitly compatible with LM248 |
关键差异点
- Higher verified gain-bandwidth product than the identified 1 MHz replacements （对比 LM248DR)
- Specified low-noise Class AB output stage （对比 LM324D)
- Four independent high-gain internally compensated amplifiers （对比 LM348D)
设计说明
Route each amplifier's feedback components close to their associated pins rather than distributing feedback paths around the PCB. Keep sensitive non-inverting inputs away from switching nodes, power inductors, relay contacts, and high-current return paths. The four channels are electrically independent, so maintain separate feedback loops and provide a continuous ground plane beneath the device. Because a complete official layout recommendation was not included in the supplied excerpts, use the manufacturer datasheet's application diagram for the final placement and decoupling pattern.
Use the manufacturer-recommended bypass capacitor and place it physically close to the LM248DT supply and ground pins to minimize supply impedance between the capacitor and the IC. Avoid sharing a narrow ground trace with switching-converter or relay current because the Class AB output stage can amplify supply ripple as noise in the control signal. Verify the actual supply range, common-mode input range, and output swing in the official datasheet; those limits were not fully available in the supplied verified excerpts and must not be inferred from another LM family.
Do not treat equal package dimensions and equal pin counts as proof that every LM-family device is an unconditional substitute. LM224DR and LM324D have documented pin compatibility with LM248, but their supply, common-mode input, output-swing, offset, bias-current, and temperature limits may not all match the LM248DT. Likewise, verify that the LM348D comparison result addresses the complete operating envelope. Recheck resistor values, stability, output loading, and supply rails before approving any replacement.
The LM248DT's 30 nA maximum input bias current is acceptable for many moderate-impedance sensor sources but can create meaningful voltage error when multiplied by a large source resistance or feedback resistor. Calculate the bias-current error against the circuit's actual Thevenin resistance, especially in thermocouple, high-impedance sensor, and long-cable interfaces. Use guarding or a low-input-bias amplifier when the resulting error exceeds the measurement budget.
合规信息
The supplied verified excerpts do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals compliance. AEC-Q100 is not applicable to this general-purpose operational amplifier.