INA132U - Low-Power Unity-Gain Diff Amp | TI | 8-SOIC
부품 번호: INA132U ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.07 | $30.70 |
| 100 | $2.62 | $262.00 |
| 500 | $2.21 | $1,105.00 |
| 1,000 | $1.85 | $1,850.00 |
INA132U 개요
A difference amplifier is an op-amp-based circuit that amplifies the voltage difference between two inputs while rejecting signals common to both (the common-mode voltage). It is a foundational building block in signal-chain electronics, classified under instrumentation amplifiers and differential interfaces. Within the broader taxonomy, the INA132U sits at: difference amplifier -> instrumentation amplifier -> operational amplifier -> amplifier IC -> analog semiconductor. On-chip laser-trimmed resistors set the gain at exactly unity (G = 1), so no external precision network is required, simplifying PCB layout and BOM cost in measurement and sensor-conditioning applications.
Key features include 250 µV typical offset voltage, a 60 V/µs equivalent slew rate at the op-amp core, and a quiescent current of 160 µA maximum over temperature. The internal op-amp common-mode range extends to the negative supply rail, enabling true single-supply operation from ground-referenced or low-side-shifted signals. Excellent TCR (temperature coefficient of resistance) tracking of the thin-film resistors maintains both gain accuracy and common-mode rejection across the -40°C to +85°C industrial range.
The architecture uses a precision bipolar input stage followed by a fixed-gain thin-film resistor network and a unity-gain output buffer. CMRR exceeds 80 dB at DC for matched input impedances, and the integrated resistor matching eliminates the gain error and trimming burden typically associated with discrete difference amplifiers built from precision 0.1% resistors and a four-op-amp instrumentation topology.
Typical applications include bridge transducer signal conditioning (load cells, strain gauges), ground-loop elimination in long-cable runs, differential signal reception in industrial process control, ECG/biopotential front-ends, and audio balanced-line receivers. Designers also use the INA132U as a building block inside higher-order active filters and as a differential-to-single-ended converter for ADC inputs.
When designing with this part, observe the absolute maximum supply of 36V (single) or ±18V (dual) and ensure input common-mode voltage stays within the input range of each input pin, not just the differential value. A 0.1 µF supply decoupling capacitor placed within 5 mm of the V+ pin is recommended. The integrated gain is fixed at 1, so external attenuation or pre-gain stages are needed when the source signal is smaller than the ADC full scale.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet.
드롭인 대체품: INA132U — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: INA132U (동일 폼 팩터 및 풋프린트) — 차이점: Operating Temperature Range, Package, Product Type.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
INA132UA
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
INA132P
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
INA143U
✅ 드롭인✓ 재고 있음
가격 문의
데이터시트 보기 →INA2134UA
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AD8278ARZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX4198ESA
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
INA132U 최대 정격 & 전기적 특성
| Product Type | Difference Amplifier |
| Number of Channels | 1 |
| Gain (Nominal) | 1 V/V |
| Input Offset Voltage (Typ) | 250 µV |
| Supply Voltage Range (Single) | 2.7 V to 36 V |
| Supply Voltage Range (Dual) | ±1.35 V to ±18 V |
| Quiescent Current (Typ) | 75 µA |
| Quiescent Current (Max) | 160 µA |
| Small-Signal Bandwidth | 300 kHz |
| Slew Rate (Op-Amp Core) | 60 V/µs (typ, equivalent) |
| Common-Mode Input Range | Extends to negative supply rail |
| 동작 온도 범위 | -40°C to +85°C |
| 패키지 | 8-pin SOIC |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
| Lead-Free | Yes |
| Gain Setting | Fixed (internal laser-trimmed thin-film resistors) |
INA132U 핀 구성
| 핀 1 | Ref — Reference pin (typical: ground); internal resistor network sense node |
| 핀 2 | V+ — Positive supply (2.7V to 36V) |
| 핀 3 | -IN — Inverting input |
| 핀 4 | +IN — Non-inverting input |
| 핀 5 | V- — Negative supply or GND (single-supply operation) |
| 핀 6 | Output — Differential-to-single-ended output (unity gain) |
| 핀 7 | NC — No internal connection on the SOIC-8 package |
| 핀 8 | NC — No internal connection on the SOIC-8 package |
일반적인 애플리케이션
INA132U 적합 용도: 7 애플리케이션s: Bridge Transducer Signal Conditioning, Ground-Loop Elimination in Long Cables, Differential-to-Single-Ended ADC Interface, Biopotential / ECG Front-End, Audio Balanced-Line Receiver, Motor and Current Sensing Differential Amplifier, Industrial Process Control Signal Interface.
Bridge Transducer Signal Conditioning
The INA132U fits bridge transducer signal conditioning in load cells, strain gauges, and pressure sensors because its internal 1× difference amplifier directly extracts the differential bridge signal while rejecting the common-mode bridge excitation voltage (typically a few volts). With 250 µV typical input offset and 80 dB DC CMRR, the INA132U keeps DC error below the LSB of a 16-bit ADC across a 5V excitation rail without external precision resistors. The part's 75 µA quiescent current lets it run continuously inside battery-powered weigh-scale and portable test-instrument designs, and the 36V absolute maximum supply accommodates the 10V or 12V excitation rails common in industrial bridge applications.
추천
Ground-Loop Elimination in Long Cables
The INA132U serves as the receiving end of a differential long cable run, where a ground potential difference between the sensor end and the ADC end otherwise appears as a 50/60 Hz common-mode interference. By amplifying only the differential signal and attenuating the common-mode by 60-80 dB at DC (and 20-40 dB at 50/60 Hz), the INA132U eliminates the need for an isolated data link and reduces installation cost. Per TI datasheet characterization, the high common-mode range that extends to the negative rail also supports 4-20 mA current loop receivers wired at single supply.
추천
Differential-to-Single-Ended ADC Interface
The INA132U works as a differential-to-single-ended converter driving the input of a single-ended ADC, replacing the in-amp-plus-driver stage with a single chip. The 300 kHz small-signal bandwidth is well matched to audio-bandwidth and industrial-control sampling rates (often 100 kS/s or below), and the 75 µA quiescent draws negligible current from any 3.3V or 5V analog rail. Compared to a discrete op-amp difference amplifier built with four 0.1% resistors, the INA132U saves PCB area and eliminates resistor-matched-trim steps in production.
추천
Biopotential / ECG Front-End
The INA132U handles ECG and biopotential front-end amplification where small differential signals (typically 1 mV peak) sit on a large electrode common-mode DC offset driven by the half-cell potential of the body. With input common-mode that extends to the negative supply, the INA132U operates directly from a single 3.3V Li-ion rail without a charge pump, supporting wearable and bedside monitor designs. The integrated 250 µV typical offset and high CMRR help reject 50/60 Hz mains pickup before the first gain stage, making it a strong building block for medical and fitness applications.
추천
Audio Balanced-Line Receiver
The INA132U works well as a balanced-line receiver for pro-audio and intercom line inputs where common-mode hum from cable shielding currents must be rejected. The 60-80 dB DC common-mode rejection and unity gain preserve line-level signals (typically 1-2 V RMS) without saturation, while the 300 kHz bandwidth extends well above the 20 kHz audio band. Unlike an audio transformer, the INA132U has no low-frequency roll-off and costs far less, making it ideal for compact pro-audio interface boards and headphone-amp front-ends.
추천
Motor and Current Sensing Differential Amplifier
The INA132U works as a differential amplifier across a low-side current-sense resistor in BLDC motor control, where the small sense voltage (10-100 mV) must be measured against a shunt sitting on a high-side switching waveform. The 300 kHz bandwidth is comfortably above the typical 10-20 kHz PWM switching frequency of small to medium motor drivers, and the input common-mode that extends to the negative rail supports simple single-supply 5V or 12V designs. Note that for high-voltage motor bus rails (>36V) use the higher-gain INA240 or use an isolated current sensor instead.
추천
Industrial Process Control Signal Interface
The INA132U sits in industrial process-control signal interfaces at the boundary between 4-20 mA or 0-10 V field wiring and a 24V backplane PLC. Its 2.7V to 36V supply range accepts 24V industrial rails directly, and the high CMRR rejects induced noise from switching contactors and VFD-driven motors on shared cable trays. The 75 µA quiescent makes it suitable for high-density multi-channel analog input cards where total power dissipation must stay below 1W per board. Use the INA132U in pairs with PLC-side ADCs to digitize up to 8 differential channels per slot.
추천
추천 제품 요약
엔지니어링 참조 데이터: INA132U — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | INA132UA | INA143U | AD8278ARZ | MAX4198ESA |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices (Maxim) |
| Package | SOIC-8 | MSOP-8 (smaller than SOIC-8) | SOIC-8 (same) | SOIC-8 (same) | SOIC-8 (same) |
| Gain | 1 V/V (fixed) | 1 V/V (fixed) | 1 or 10 V/V (selectable) | 1 V/V (fixed, quad) | 1 V/V (fixed) |
| Channels | 1 | 1 | 1 | 4 channels in one package | 1 |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
주요 차별점
- Integrated laser-trimmed thin-film resistor network eliminates external precision components (vs AD8278ARZ)
- Single-supply operation with input common-mode range extending to the negative rail (vs MAX4198ESA)
- Programmable gain options within the same TI family (vs INA143U)
- Low quiescent current suits battery-powered and high-density designs (vs Discrete op-amp + 4-resistor difference amp (e.g., OPA2277 + four LT5400 resistors))
설계 노트
Place a 0.1 µF X7R ceramic decoupling capacitor within 5 mm of the V+ pin to ground (single supply), and a 10 µF bulk capacitor on the same rail close to the chip. For dual-supply operation, decouple V+ and V- both. The internal op-amp is unity-gain stable so no output compensation is required, but keep the output trace short to avoid capacitive loading above 50 pF which can degrade phase margin. Matched-series or guarded traces on the +IN and -IN inputs help preserve CMRR at high frequencies.
Do not apply input voltages that exceed the input common-mode range, even though the op-amp internal common-mode range extends to the negative rail. The on-chip resistor network introduces additional headroom constraints: at the high rail, keep at least 2V difference between the input pin voltage and V+; at the low rail, the input pin can swing down to V- but the input current increases dramatically once V_-0.5V is crossed, bias-current reversal at the protection diodes. Estimated: with a 5V single supply, the input common-mode range is approximately 0V to 3V; verify this against the datasheet curves for your design.
Quiescent current is 75 µA typical but can rise to 160 µA maximum across the -40°C to +85°C industrial range. Estimated: a 16-channel multi-channel analog-input board built entirely from INA132U parts draws up to 2.56 mA at 25°C and up to 5.12 mA worst-case per board, well within the budget of a 5V or 24V backplane supply. Add a 10kΩ source resistance buffer upstream if the source impedance of the bridge or sensor is above 10kΩ, otherwise the input bias current (~25 nA typical per input) introduces a 0.625 mV DC offset.
For best CMRR at DC, keep the source impedance on both inputs matched. A 1 kΩ mismatch at one input can degrade CMRR by 20 dB at DC. For AC signals, lower the input filter resistor and use a small (10-100 pF) differential capacitor across the input pins to balance high-frequency common-mode impedances. For long shielded-cable inputs, add an input TVS diode clamp to survive IEC 61000-4-2 ESD strikes on the field wiring.
규정 준수 정보
RoHS compliant per TI product page. Automotive qualification (AEC-Q100) is not provided; the -Q1 suffix is reserved for automotive-grade parts in the INA family if available. Verify halogen-free status with the manufacturer for new designs.