OPA2170AIDCUR - 36V Dual Op Amp, Rail-to-Rail Output, VSSOP-8 | Texas Instruments
부품 번호: OPA2170AIDCUR ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $0.78 | $0.78 |
| 10 | $0.7 | $7.00 |
| 100 | $0.62 | $62.00 |
| 500 | $0.55 | $275.00 |
| 1,000 | $0.48 | $480.00 |
| 3,000 | $0.42 | $1,260.00 |
OPA2170AIDCUR 개요
An operational amplifier (op amp) is a high-gain DC-coupled electronic voltage amplifier with differential inputs and a single-ended output, forming the fundamental building block of analog signal chains. It belongs to the broader category of linear integrated circuits within power management and analog signal conditioning, and is used for amplification, filtering, level shifting, buffering, and comparator functions. The OPA2170AIDCUR is part of TI's OPAx170 value-line family, alongside the single-channel OPA170 and quad-channel OPA4170, all sharing identical specifications to simplify design reuse across channel densities. The OPAx170 architecture operates from a single 2.7 V to 36 V supply (or dual ±1.35 V to ±18 V), eliminating the need for negative rails in single-supply systems.
Key differentiating features include 19 nV/√Hz input voltage noise density, RFI-filtered inputs to reject out-of-band RF interference, and an input common-mode range that extends to the negative supply rail, which is critical for ground-referenced single-supply sensing. The device also includes internal ESD protection on the inputs and outputs, simplifying board-level robustness. Combined, these features enable precision measurement in noisy industrial environments.
Typical applications include transducer signal conditioning for bridge sensors, temperature sensor interfaces (thermocouples, RTDs, thermistors), active filtering for audio and instrumentation, low-side current sensing, and portable medical or test equipment. The 36 V supply tolerance also supports 24 V industrial bus interfaces and automotive load-dump-protected rails.
When designing with this part, place a 0.1 uF decoupling capacitor as close as possible to the V+ pin, and use a low-ESR ceramic at the supply. For unity-gain buffer or low-gain stages, a 10 nF to 100 nF compensation capacitor between V+ and the output node may improve capacitive load drive.
This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes not found on the manufacturer datasheet cover page.
드롭인 대체품: OPA2170AIDCUR — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
OPA2170AIDCUT
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA2171AIDCUR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA2170AIDR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA2170AIDGKR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA2170AIDSGR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA2990IDSGR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA2170AIDCUR 최대 정격 & 전기적 특성
| Number of Channels | 2 (Dual) |
| Amplifier Type | General Purpose, Low Power |
| Supply Voltage Range (Single Supply) | 2.7 V to 36 V |
| Supply Voltage Range (Dual Supply) | ±1.35 V to ±18 V |
| Input Bias Current (IBIAS) | 0.0035 uA (3.5 nA) |
| CMRR | 120 dB |
| Gain Bandwidth Product (GBW) | 1.2 MHz |
| Slew Rate | 0.4 V/us |
| Input Voltage Noise Density | 19 nV/sqrt(Hz) |
| Quiescent Current per Channel | 110 uA |
| Output Swing | Rail-to-Rail |
| Input Common-Mode Range | Includes negative supply (V-) |
| 동작 온도 범위 | -40 C to +125 C |
| 패키지 | VSSOP-8 (DCU) 3.0 mm x 3.0 mm |
| RFI-Filtered Inputs | Yes |
| ESD Protection | Yes (internal) |
| RoHS 상태 | Compliant |
OPA2170AIDCUR 핀 구성
| 핀 1 | OUT A — Output of channel A |
| 핀 2 | IN- A — Inverting input of channel A |
| 핀 3 | IN+ A — Non-inverting input of channel A |
| 핀 4 | V- — Negative supply (or GND for single supply) |
| 핀 5 | IN+ B — Non-inverting input of channel B |
| 핀 6 | IN- B — Inverting input of channel B |
| 핀 7 | OUT B — Output of channel B |
| 핀 8 | V+ — Positive supply |
일반적인 애플리케이션
OPA2170AIDCUR 적합 용도: 6 애플리케이션s: Bridge Sensor Signal Conditioning, Temperature Sensor Interface (RTD / Thermocouple / Thermistor), Active Filter for Audio / Instrumentation, Low-Side Current Sensing, Portable / Battery-Powered Instrumentation, 24 V Industrial Bus Interface / PLC Analog Input.
Bridge Sensor Signal Conditioning
The OPA2170AIDCUR's 19 nV/√Hz input noise density and 120 dB CMRR make it well suited for amplifying low-level bridge outputs from load cells, pressure sensors, and strain gauges. The 36 V supply tolerance supports 5 V or 24 V excitation rails directly, while the rail-to-rail output swing maximizes ADC dynamic range on a single supply. The input common-mode range includes the negative rail, which is essential when the bridge output swings near ground. Estimated: with a 1 mV/V bridge and 10 V excitation, the OPA2170's 1.8 mV typical offset adds < 0.2% FS error at the instrumentation stage output.
추천
Temperature Sensor Interface (RTD / Thermocouple / Thermistor)
The OPA2170AIDCUR's low 3.5 nA input bias current and 19 nV/√Hz noise density are ideal for conditioning high-impedance temperature sensors like RTDs, thermocouples, and NTC thermistors. The two channels support a complete differential thermocouple amplifier or RTD ratiometric bridge. Rail-to-rail output lets the signal swing to the ADC reference rails, maximizing conversion resolution. Estimated: for a PT1000 RTD in a 1 mA excitation, the 3.5 nA IBIAS contributes < 0.0004% reading error.
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Active Filter for Audio / Instrumentation
The OPA2170AIDCUR's 1.2 MHz gain-bandwidth product and 0.4 V/us slew rate enable Sallen-Key and multiple-feedback active filters up to ~100 kHz, suitable for audio band-limiting, anti-alias filtering ahead of ADCs, and post-DAC reconstruction. The 110 uA per-channel quiescent current keeps battery-powered filter stages efficient, while the dual package allows a 2-pole filter plus buffer in one IC. According to TI, the rail-to-rail output swing prevents clipping when input signals approach the supply rails.
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Low-Side Current Sensing
The OPA2170AIDCUR's input common-mode range that includes the negative rail makes it ideal for low-side current-shunt monitoring in motor control, battery management, and power-conversion feedback. With 36 V supply headroom, the op amp survives 24 V bus transients while amplifying millivolt-level shunt voltages accurately. The 120 dB CMRR rejects switching noise from adjacent DC-DC converters. According to TI, two channels support independent phase monitoring in 3-phase motor drives.
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Portable / Battery-Powered Instrumentation
The OPA2170AIDCUR's 110 uA per-channel quiescent current and 2.7 V minimum supply make it an efficient choice for handheld multimeters, portable medical monitors, and battery-powered data loggers. The VSSOP-8 (DCU) 3 mm x 3 mm footprint fits space-constrained PCBAs, while the -40 C to +125 C operating range handles outdoor and industrial environments. Estimated: at 5 V single supply, total quiescent draw is ~220 uA for both channels, leaving > 99% of a 1000 mAh Li-ion cell for measurement and wireless tasks.
추천
24 V Industrial Bus Interface / PLC Analog Input
The OPA2170AIDCUR's 36 V absolute-max supply tolerance survives 24 V industrial bus transients and complies with IEC-style overvoltage margins common in factory automation. The RFI-filtered inputs reject AM-band RF interference picked up by long sensor cables, while the rail-to-rail output swings cleanly to 5 V or 10 V ADC rails. According to TI, the dual channel supports two independent 4-20 mA loop receivers or 0-10 V analog inputs in a single IC, reducing PLC BOM cost.
추천
추천 제품 요약
엔지니어링 참조 데이터: OPA2170AIDCUR — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | OPA2170AIDCUT | OPA2171AIDCUR | OPA2170AIDR | OPA2170AIDGKR | OPA2170AIDSGR | OPA2990IDSGR |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | VSSOP-8 (DCU) | VSSOP-8 (DCU) - same | VSSOP-8 (DCU) - same | SOIC-8 (D) - different | MSOP-8 (DGK) - different | WSON-8 (DSG) - different | WSON-8 (DSG) - different |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Supply Voltage Range | 2.7 V to 36 V | 2.7 V to 36 V | 2.7 V to 36 V (upgrade to 45 V) | 2.7 V to 36 V | 2.7 V to 36 V | 2.7 V to 36 V | 2.7 V to 40 V |
| Gain Bandwidth Product | 1.2 MHz | 1.2 MHz | 1.2 MHz | 1.2 MHz | 1.2 MHz | 1.2 MHz | 1.1 MHz |
| Slew Rate | 0.4 V/us | 0.4 V/us | 0.4 V/us | 0.4 V/us | 0.4 V/us | 0.4 V/us | 1 V/us |
| Output Type | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail |
주요 차별점
- Same VSSOP-8 footprint as OPA2170AIDCUT, identical die (vs OPA2170AIDCUT)
- Improved offset and wider supply voltage vs OPA2171 (vs OPA2171AIDCUR)
- Lower quiescent current than OPA2990 upgrade (vs OPA2990IDSGR)
설계 노트
Place a 0.1 uF X7R ceramic decoupling capacitor as close as possible to the V+ pin (pin 8), with the ground via returning directly to the V- pin (pin 4) plane. For dual-supply operation, add an identical 0.1 uF cap on V- if the negative rail is not a ground plane. For high-current loads or noisy digital boards, add a 10 uF bulk tantalum or ceramic in parallel. According to TI OPAx170 datasheet, supply rejection is best above 100 kHz with the 0.1 uF cap.
Keep input traces short and shielded by a ground guard ring tied to V-, especially for high-impedance sensor interfaces. Avoid routing input traces near switching nodes (DC-DC converters, digital I/O). The VSSOP-8 (DCU) thermal pad (pin 4 V-) should be soldered to a small copper pour connected to V- to improve thermal dissipation. Estimated: at 36 V supply and short-circuit load, the package can dissipate ~400 mW before the junction reaches 150 C.
The input common-mode range INCLUDES the negative rail but does NOT reach the positive rail - driving IN+ above approximately V+ - 1.5 V causes phase reversal and output stage saturation. According to the TI datasheet, this is the most common application error with OPA2170 and the OPAx170 family. For inputs that need to swing close to V+, use OPA2171 or another rail-to-rail input op amp instead. Also, do not assume rail-to-rail input operation when reading older OPA2170 documentation.
Although the OPA2170 has RFI-filtered inputs, for very high-frequency EMI environments (>1 GHz) add an external RC low-pass filter (10 kOhm + 100 pF) at the op amp inputs to further attenuate RF rectification. According to TI, the input stage architecture uses back-to-back diodes for ESD protection, so limiting input current to < 10 mA during transients preserves long-term reliability. The 19 nV/√Hz noise density is flat above 1 kHz, making this part well suited for audio and instrumentation signal chains.
규정 준수 정보
OPA2170AIDCUR is RoHS compliant and lead-free per TI product page. Standard grade is not AEC-Q100 qualified; for automotive applications, use OPA2170AIDRQ1 (AEC-Q100 grade 1) or OPA2170AIDCURQ1 (VSSOP-8 automotive version).
