INA145UA - Programmable Gain Difference Amplifier | Texas Instruments
MPN: INA145UA ⚠ آخر فرصة للشراءINA145UA نظرة عامة
A difference amplifier is an operational-amplifier circuit that subtracts one input voltage from another and amplifies the resulting differential voltage while rejecting signals common to both inputs. The INA145 belongs to the precision difference-amplifier hierarchy, which includes instrumentation amplifiers and programmable-gain amplifiers used in current sensing, sensor interfaces, and diagnostic equipment.
The INA145 integrates a precision operational amplifier with an on-chip resistor network. External resistors connected to its gain-control pins allow gains from 1 V/V to 1000 V/V. Its 500 kHz bandwidth supports higher-frequency measurements than purely static instrumentation amplifiers, while 86 dB common-mode rejection suppresses common-mode interference. The 570 uA quiescent current supports low-power designs, and the specified operating-temperature range is -40°C to +85°C.
Electrically, the device is intended for differential signal conditioning where input common-mode range, gain accuracy, output swing, and supply voltage must be considered together. A wide supply range permits operation from low-voltage analog systems to higher-voltage industrial interfaces. Because the gain is set by external resistors, resistor tolerance and temperature coefficient directly influence gain accuracy and common-mode performance.
Typical uses include shunt-current measurement in power converters, bridge-sensor signal conditioning, battery and power-system monitoring, medical instrumentation interfaces, and industrial current sensing. The 8-pin SOIC package is also convenient for designs that need an amplifier with a small footprint and conventional surface-mount assembly.
Designers should calculate input and output common-mode limits for the selected gain and supply voltage, and should use precision gain resistors with suitable tolerance and temperature stability. Input filtering and careful layout are important when the source impedance is high or the measured signal contains switching noise. The component is available from distributors in stock, but one marketplace identifies the exact MPN as discontinued, so procurement plans should account for lifecycle risk.
This product record combines verified manufacturer and distributor information, practical application guidance, lifecycle observations, and drop-in replacement research. It is designed to help engineers evaluate the INA145UA beyond a basic parametric listing while remaining explicit about any specification that requires confirmation from the manufacturer datasheet.
بدائل مباشرة لـ INA145UA — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
INA145UA/2K5
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
INA145UA الحدود القصوى والخصائص الكهربائية
| Amplifier Type | Programmable Gain Difference Amplifier |
| Number of Amplifiers | 1 circuit |
| Gain Range | 1 V/V to 1000 V/V |
| Bandwidth | 500 kHz |
| Common-Mode Rejection Ratio | 86 dB |
| تيار السكون | 570 uA |
| Minimum Supply Voltage | ±2.25 V |
| Maximum Supply Voltage | ±18 V |
| Offset Voltage | 1 mV |
| درجة حرارة التشغيل | -40°C to +85°C |
| العلبة | 8-SOIC |
| عدد الدبابيس | 8 pins |
| نوع التركيب | Surface Mount |
| حالة RoHS | Compliant |
تكوين أطراف INA145UA
| دبوس 1 | RG1 — Gain-setting resistor connection |
| دبوس 2 | IN- — Inverting input |
| دبوس 3 | IN+ — Non-inverting input |
| دبوس 4 | V- — Negative supply connection |
| دبوس 5 | RG2 — Gain-setting resistor connection |
| دبوس 6 | OUT — Amplified output |
| دبوس 7 | V+ — Positive supply connection |
| دبوس 8 | RG1 — Gain-setting resistor connection |
التطبيقات النموذجية
INA145UA مناسب لـ 6 التطبيقs: Shunt-Based Current Sensing, Bridge-Sensor Signal Conditioning, Power-Module Current Monitoring, Battery Pack Monitoring, Medical Sensor Interface, Industrial Differential Signal Interface.
Shunt-Based Current Sensing
The INA145UA fits high-side or low-side shunt measurement because it combines a programmable gain range of 1 V/V to 1000 V/V with 86 dB CMRR. Place the amplifier across the shunt so the small differential voltage is amplified while common-mode current noise is rejected. Its 500 kHz bandwidth supports measurements beyond static DC-only solutions, although the selected gain and supply voltage must keep both inputs and the output within their operating ranges.
موصى به
Bridge-Sensor Signal Conditioning
The INA145UA is appropriate for resistive bridge outputs because its high common-mode rejection helps suppress equal-mode excitation and pickup while amplifying the sensor differential. Programmable external-resistor gain allows one amplifier family to cover different bridge sensitivities and excitation levels. The 1 mV offset and 86 dB CMRR figures must be weighed against the bridge output, while the 500 kHz bandwidth is useful when mechanical or thermal transients must be captured.
موصى به
Power-Module Current Monitoring
The INA145UA can monitor current in a compact power module by amplifying the voltage developed across a low-value shunt and rejecting supply-related common-mode disturbance. Its ±2.25 V to ±18 V supply range supports multiple analog power levels, and the 570 uA quiescent current limits its impact on low-power systems. Designers should verify the input common-mode range at the programmed gain and ensure the output remains within the output-swing limits.
موصى به
Battery Pack Monitoring
The INA145UA is useful for monitoring current in battery-management systems where the sensed shunt voltage is small relative to the pack voltage. Its 86 dB CMRR improves rejection of common-mode switching and bus noise, while programmable gain accommodates different shunt values and cell counts. The 500 kHz bandwidth permits ripple and transient measurement, but layout must keep shunt current away from sensitive input traces and preserve a low common-impedance ground path.
موصى به
Medical Sensor Interface
The INA145UA can condition low-level differential sensor outputs in diagnostic and monitoring equipment where common-mode interference must be rejected before conversion or analysis. The adjustable gain lets the interface adapt to different electrode, bridge, or pressure-sensor sensitivities, and the 570 uA quiescent current benefits portable systems. Medical-system designers still need to assess leakage, patient isolation, applicable safety requirements, and the unspecified input and output analog limits before using the device.
موصى به
Industrial Differential Signal Interface
The INA145UA is appropriate for industrial measurement interfaces that carry a small differential signal over a noisy common-mode environment. Its 500 kHz bandwidth supports process-control and diagnostic signals, while 86 dB CMRR improves signal integrity at the analog front end. The ±2.25 V to ±18 V supply flexibility permits adaptation to industrial rails, but designers should verify the input common-mode range, output swing, gain-resistor accuracy, and grounding at the selected gain.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ INA145UA — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | INA145UA/2K5 |
|---|---|---|
| Package | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments |
| Amplifier Type | Programmable Gain Difference Amplifier | Programmable Gain Difference Amplifier |
| Gain Range | 1 V/V to 1000 V/V | 1 V/V to 1000 V/V |
| Bandwidth | 500 kHz | 500 kHz |
| Common-Mode Rejection Ratio | 86 dB | 86 dB |
| Quiescent Current | 570 uA | 570 uA |
| Supply Voltage Range | ±2.25 V to ±18 V | ±2.25 V to ±18 V |
| Operating Temperature | -40°C to +85°C | -55°C to +125°C |
أبرز الفروقات
- Wide programmable gain range (مقابلINA145UA/2K5)
- Practical signal bandwidth (مقابلINA145UA/2K5)
- Common-mode interference rejection (مقابلINA145UA/2K5)
ملاحظات التصميم
Do not select the gain from package temperature or bandwidth alone. Check the manufacturer datasheet's input common-mode and output-swing limits for the intended supply voltage and gain, because the INA145UA accepts ±2.25 V to ±18 V but the usable signal range changes with gain and rail voltage. Also account for the 1 mV offset when the measured shunt differential can be very small.
Route IN-, IN+, and gain-resistor connections away from switching nodes and high-current shunt traces. Connect the input-referenced ground and supply-return paths using a low-impedance plane, and place gain-setting resistors close to RG1 and RG2 to minimize added noise and sensitivity to leakage. A solid ground plane is preferable to long narrow return traces in a current-measurement board.
The verified quiescent current is 570 uA, but total supply consumption also depends on output current and supply voltage. Confirm that each rail remains within the device's operating range during startup and fault conditions. If the source signal can have a common-mode voltage outside the selected gain's input range, add input attenuation or protection rather than assuming the ±18 V supply rating protects the inputs.
معلومات الامتثال
The verified PCB Electronics listing categorizes the INA145UA as RoHS compliant. No verified REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements were supplied.
