INA149AIDR - ±275V Difference Amplifier | Texas Instruments (Tape & Reel)
MPN: INA149AIDR ✓ פעילINA149AIDR סקירה
A high common-mode difference amplifier is an instrumentation amplifier that preserves a small voltage difference between two inputs even when both inputs are elevated far beyond the amplifier's supply rails. This capability is essential in power-system monitoring, motor-control systems, test equipment, and industrial measurement circuits where a useful sensor signal may sit on top of a substantially larger voltage. The INA149AIDR sits within the hierarchy of difference amplifier, instrumentation amplifier, analog signal-conditioning IC, and power-management measurement component.
The main differentiating specifications are the ±275 V common-mode range, unity differential gain, and a verified minimum CMRR of 90 dB under a +125°C DC condition. Common-mode rejection is important because unwanted voltage shared by both inputs should not appear at the output as differential error. The integrated thin-film resistor network provides a defined unity-gain relationship, simplifying circuit design where external gain-setting resistors would otherwise be required.
Internally, the INA149 is a single monolithic device combining a precision op amp with the resistor network. Its high-voltage input structure allows measurement of millivolt-level differential signals in the presence of very large common-mode voltages. That architecture supports direct sensing without an external high-voltage instrumentation front end. The operating range of -40°C to +125°C supports use across industrial environments where temperature variation and long operating lifetimes are important design constraints.
Typical applications include power-rail and inverter monitoring, motor-drive feedback, battery-management measurement, laboratory instrumentation, and high-side sensing in industrial control systems. In each case, the central design trade-off is the need to preserve differential accuracy while controlling errors caused by common-mode voltage, input offset, bandwidth, and supply performance. System designers should also account for the amplifier's power dissipation and the limitations of its package when operating near the upper temperature limit.
Place the INA149AIDR close to the sensing nodes and maintain short, guarded differential traces to minimize pickup from adjacent switching circuits. A solid ground-plane layout, careful bypassing of the supply pins, and isolation from high-current return paths help preserve measurement quality. Because the exact signal bandwidth and input-offset limits depend on the complete INA149 grade and operating conditions, use the manufacturer datasheet's full electrical tables when sizing filters and setting measurement-error budgets.
This page combines the verified INA149AIDR specifications, same-footprint alternatives, application guidance, comparison parameters, and practical design notes into an engineering-focused overview. It is intended to help buyers identify the correct amplifier family, confirm packaging, and plan the mechanical, thermal, and signal-integrity requirements of a high common-mode measurement circuit.
חלופות תחליף ישיר עבור INA149AIDR — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם INA149AIDR (אותו גורם צורה וטביעת רגל) — שונים ב Package, Bandwidth, Differential Gain, Operating Temperature Range, Product Type.
INA149-EP
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
INA117KU/2K5
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←INA148UA
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←INA148-Q1
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
INA149AIDR דירוגים מרביים ומאפיינים חשמליים
| Product Type | High common-mode voltage difference amplifier |
| Amplifier Circuit Count | 1 circuit |
| Architecture | Monolithic precision op amp with integrated thin-film resistor network |
| Differential Gain | 1 V/V (unity gain) |
| Input Common-Mode Voltage Range | -275 V to +275 V |
| Supply Voltage Range | Up to 36 V total, including ±18 V dual supply operation |
| Common-Mode Rejection Ratio | 90 dB minimum at +125°C DC |
| טווח טמפרטורת פעולה | -40°C to +125°C |
| מארז | 8-pin SOIC |
| מספר פינים | 8 pins |
| סוג הרכבה | Surface mount |
| Lead-Free Status | Lead free |
| סטטוס RoHS | RoHS compliant |
מדריך תצורת פינים של INA149AIDR 8-pin soic
תצורת פינים עבור INA149AIDR (מארזת 8-pin soic). רכיב אנלוגי זה כולל פיני כניסה, יציאה ואספקת מתח. יש לעיין בגיליון הנתונים של היצרן לתצורות פיני איפוס היסט, פיצוי והפעלה. אידיאלי למעגלי עיצוב אותות ומגברים.
אין נתוני פריסת פינים מפורטים עבור INA149AIDR.
עיינו ב- גיליון נתונים עבור תצורת פינים מלאה.
יישומים טיפוסיים
INA149AIDR מתאים עבור 6 יישוםs: High-Voltage Power-Rail Monitoring, Motor-Drive Feedback Measurement, Battery-Pack Voltage Balancing, Laboratory Differential Instrumentation, Industrial Sensor Interfacing, Inverter and Converter Feedback.
High-Voltage Power-Rail Monitoring
The INA149AIDR is well suited to sensing a small voltage difference across a high-side shunt or sense element in an industrial power rail. Its ±275 V common-mode range allows the two inputs to remain elevated while the measured differential voltage stays within the amplifier's linear operating region. The integrated unity-gain resistor network simplifies the signal path, and the verified 90 dB minimum CMRR at +125°C DC helps suppress voltage shared by both inputs. Layout should keep the sense traces short and away from switching nodes so that parasitic pickup does not obscure the differential result.
מומלץ
Motor-Drive Feedback Measurement
The INA149AIDR can monitor feedback signals in motor-control and power-converter systems where switching nodes create large common-mode transients. Its ±275 V input common-mode capability is the principal fit because the desired feedback voltage may be small relative to the motor-bus voltage. Unity gain provides a predictable measurement ratio, while the integrated thin-film network removes external gain-setting components. Designers should still verify bandwidth against the switching transient spectrum, provide local supply bypassing, and isolate the sense pair from high-current motor-return paths to preserve differential accuracy.
מומלץ
Battery-Pack Voltage Balancing
In battery-management systems, the INA149AIDR can detect the small difference between adjacent cell or group voltages when the common-mode level is much higher than the imbalance being measured. The ±275 V common-mode range provides margin for elevated pack buses, and unity gain supports direct comparison with a controller ADC. The -40°C to +125°C operating range suits demanding industrial environments. Critical design work remains in confirming absolute input limits, control-loop bandwidth, and thermal behavior under the exact battery chemistry and series count.
מומלץ
Laboratory Differential Instrumentation
The INA149AIDR is useful in laboratory and field-test equipment that must measure small differential voltages superposed on large common-mode potentials. Its precision unity-gain topology, ±275 V common-mode range, and integrated thin-film network provide a straightforward front end for precision measurement. The verified minimum CMRR of 90 dB at +125°C DC supports stable operation across the extended -40°C to +125°C range. For instrumentation-grade results, evaluate offset and gain error at the actual temperature, control input capacitance, and separate sensitive sense wiring from test-bench power paths.
מומלץ
Industrial Sensor Interfacing
The INA149AIDR can serve as the high-voltage interface between an industrial sensor and low-voltage measurement circuitry when the sensor outputs a small differential signal on an elevated common-mode voltage. The ±275 V common-mode range allows the amplifier to reject the large shared voltage while preserving the differential information. Its unity gain and integrated resistor network reduce analog-board complexity, and its wide temperature specification supports harsh environments. Confirm the sensor's output bandwidth and grounding method, and place the amplifier close to the sensor connector to minimize noise pickup before cable faults are assumed absent.
מומלץ
Inverter and Converter Feedback
The INA149AIDR supports feedback and fault-detection circuits in inverters, converters, and power-control equipment where a bridge or switching node establishes a large common-mode level. The ±275 V range allows direct sensing of low-level differential information without moving it to a lower voltage first, while unity gain keeps the signal chain predictable. The 90 dB minimum CMRR at +125°C DC is particularly valuable when all sensing nodes move together but the measurement depends only on their difference. Validate surge margins, input bias effects, and bandwidth, and provide clean local bypassing to avoid measurement disturbance.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור INA149AIDR — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | INA149AIDRR | INA149-EP | INA117 | INA148 | INA148-Q1 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Product Type | High common-mode voltage difference amplifier | INA149 difference amplifier | INA149 difference amplifier | High common-mode voltage amplifier | High common-mode voltage amplifier | INA148 high common-mode voltage amplifier |
מבדילים עיקריים
- Highest verified common-mode capability in the INA comparison set (לעומתINA148)
- Drop-in ordering flexibility without changing the PCB footprint (לעומתINA149AIDRR)
- Manufacturer-confirmed compatibility with established high common-mode amplifier families (לעומתINA117)
- Extended industrial temperature coverage with high common-mode rejection (לעומתINA148-Q1)
הערות תכנון
Route the two sensing inputs as a tightly coupled differential pair. Keep their separation small and continuous from the measurement point to the INA149AIDR, and avoid routing them alongside power-switching nodes or high-current return paths. A solid ground plane helps provide a low-impedance return, but the differential signal should still be treated as a pair; excessive distance between input traces can allow different noise voltages to appear on the two lines and reduce common-mode rejection.
Place the INA149AIDR close to the sensing connector or shunt and place its supply bypassing capacitors at the device pins. Keep the input nodes away from the clocking, gate-drive, and switching components that create the common-mode environment being rejected. Because the amplifier is intended to operate with elevated common-mode voltage, its input-network layout and protection components must be evaluated against the actual surge and fault conditions rather than only steady-state voltage.
Verify the complete signal path against the INA149AIDR bandwidth and the switching spectrum present at the sensing node. A high CMRR does not eliminate errors caused by unequal input capacitance, leakage through protection components, or a common-mode signal that exceeds the relevant device limits. If the measured difference is very small, use matched input components and provide a defined return path; otherwise, parasitic pickup can dominate the useful differential signal.
The INA149AIDR operates across -40°C to +125°C, but the allowable supply, input, and output conditions must remain within their respective limits over the complete temperature range. At elevated temperature, include the minimum 90 dB CMRR condition at +125°C DC when estimating rejection of a shared input signal. Provide adequate copper around the 8-pin SOIC and avoid placing the device near a localized heat source that could create additional temperature gradients across the board.
מידע על תאימות
The INA149AIDR is identified as lead free and RoHS compliant. The standard INA149AIDR ordering code is not identified as an automotive-qualified grade. REACH, halogen-free, and conflict-minerals status are not established for this ordering code.