OPA396 - 1MHz 24uA Precision RRIO Op Amp | Texas Instruments
부품 번호: OPA396 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $1.15 | $1.15 |
| 10 | $0.98 | $9.80 |
| 100 | $0.79 | $79.00 |
| 500 | $0.65 | $325.00 |
| 1,000 | $0.52 | $520.00 |
OPA396 개요
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output, and is a fundamental building block of analog signal conditioning used for amplification, filtering, and buffering. The OPA396 belongs to the precision op amp category, which prioritizes low offset voltage, low drift, and low input bias current. Within the amplifier hierarchy it is a micropower precision op amp, positioned between general-purpose op amps and ultra-low-power nanopower devices, and its RRIO capability maximizes dynamic range in low-voltage systems.
Key differentiating specifications include an ultra-low input bias current of 10 fA (CMOS input stage), a maximum offset voltage of 100 uV, and a low offset drift of 1.2 uV/C over temperature. These parameters deliver high DC accuracy in sensor interfaces and transimpedance applications. The device operates from a 1.7 V to 5.5 V single supply and is specified from -40C to +125C, supporting both single-cell battery systems and industrial environments.
Technically, the OPA396 uses a CMOS input stage responsible for its femtoampere-level bias current, and a class-AB rail-to-rail output stage providing solid drive at low supply current. Its high speed-to-power ratio (1 MHz bandwidth at 23.5 uA) is exceptional for battery-powered equipment, and unity-gain stability simplifies design-in. It is a member of the OPAx396 family, which includes single (OPA396), dual (OPA2396), and quad (OPA4396) versions for scalable designs.
Typical applications include battery-powered instrumentation, photodiode transimpedance amplification where the 10 fA bias current minimizes dark-current error, portable medical devices, and low-power active filters. The rail-to-rail output swings fully at 1.7 V supplies, allowing direct interfacing with ADCs in IoT sensor nodes and wearable electronics.
For design-in, decouple the supply with a 0.1 uF capacitor placed close to the supply pin, and account for the noise-gain versus bandwidth trade-off in high-gain configurations. Prices as of 2026-08-30 reflect distributor single-unit and volume pricing shown below.
드롭인 대체품: OPA396 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
OPA348DCKT
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
OPA391DCKT
⚡ 동일 패키지 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
OPA2396DCKR
⚡ 동일 패키지📋 참조 대체품 (카탈로그에 없음)
MCP6001T-E/OT
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MAX4230AUT+T
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
OPA396 최대 정격 & 전기적 특성
| 채널 수 | 1 |
| Gain-Bandwidth Product | 1 MHz |
| Quiescent Current (per amp) | 23.5 uA |
| Supply Voltage Range | 1.7 V to 5.5 V |
| Input Bias Current | 10 fA (typ) |
| Offset Voltage (max) | 100 uV |
| Offset Drift | 1.2 uV/C |
| Input/Output Type | Rail-to-Rail Input and Output (RRIO) |
| 동작 온도 | -40C to +125C |
| 패키지 | SC-70-5 (DCK) |
| 실장 유형 | Surface Mount |
| Unity-Gain Stable | Yes |
| Output Stage | Class-AB rail-to-rail (CMOS) |
| Input Stage | CMOS |
| Family | OPAx396 (OPA396 / OPA2396 / OPA4396) |
| RoHS 상태 | Compliant |
OPA396 핀 구성
| 핀 1 | OUT — Amplifier output (rail-to-rail) |
| 핀 2 | V- — Negative supply / ground |
| 핀 3 | IN+ — Non-inverting input (rail-to-rail) |
| 핀 4 | IN- — Inverting input (rail-to-rail) |
| 핀 5 | V+ — Positive supply, 1.7 V to 5.5 V |
일반적인 애플리케이션
OPA396 적합 용도: 6 애플리케이션s: Photodiode Transimpedance Amplification, Battery-Powered Portable Instrumentation, Portable Medical and Health Monitoring, IoT Sensor Node Signal Conditioning, Low-Power Active Filters, Industrial High-Gain Analog Front Ends.
Photodiode Transimpedance Amplification
The OPA396 fits photodiode TIA circuits because its 10 fA input bias current contributes essentially zero dark-current error, and the rail-to-rail input stage accepts photocurrent signals approaching the 0 V rail on single 1.7 V to 5.5 V supplies. Placed with the photodiode into the inverting input and a feedback resistor (tens to hundreds of kilohms), it converts current to voltage with high DC accuracy at only 23.5 uA supply current. A feedback capacitor compensates diode capacitance for stability; the 1 MHz gain-bandwidth supports moderate closed-loop bandwidths in portable optical sensing.
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Battery-Powered Portable Instrumentation
In battery-powered instruments, the OPA396 extends runtime with only 23.5 uA quiescent current while still providing 1 MHz bandwidth and 100 uV max offset for accurate signal conditioning. Operating down to 1.7 V, it runs directly from a single alkaline or lithium coin cell, and its rail-to-rail output swings to the rails so the full ADC input range is usable as the battery discharges. In a sensor front end, it amplifies bridge or thermistor signals before the ADC; the 1.2 uV/C drift keeps calibration intact over the industrial -40C to +125C temperature range.
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Portable Medical and Health Monitoring
Portable medical devices such as glucose meters, pulse sensors, and wearable health monitors need precision amplification with strict power budgets. The OPA396's 10 fA bias current and 100 uV offset preserve the accuracy of high-impedance bio-electrode and optical sensor signals, while 23.5 uA quiescent current maximizes battery life in always-on monitoring modes. The SC-70-5 package minimizes PCB area in compact wearable enclosures, and RRIO operation at 1.7 V to 5.5 V suits both coin-cell and single-cell Li-ion rails, with rail-to-rail output driving low-speed ADCs directly without an extra buffer stage.
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IoT Sensor Node Signal Conditioning
In IoT sensor nodes, the OPA396 conditions weak sensor outputs (thermistors, strain gauges, gas sensors) ahead of a microcontroller ADC while drawing negligible supply current from energy-harvesting or battery sources. Its RRIO input reads signals down to ground and its output swings fully at low supplies, maximizing effective ADC resolution; 1 MHz bandwidth leaves margin for anti-aliasing filter gain stages. With 23.5 uA consumption and sub-100 uV offset, designers can duty-cycle the amplifier rail or leave it always-on, and the SC-70-5 footprint keeps node cost and size low.
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Low-Power Active Filters
The OPA396 implements Sallen-Key and multiple-feedback active filters in low-power signal chains, where its unity-gain stability and 1 MHz gain-bandwidth support filter corner frequencies into the tens of kilohertz with adequate Q headroom. At 23.5 uA per amplifier, multi-pole filter designs remain practical in battery products, and RRIO output prevents clipping of filter pass-band signals near the rails. The 100 uV maximum offset keeps DC offsets in the filter passband minimal, avoiding wasted ADC dynamic range, and the CMOS input stage keeps bias-current-induced errors negligible with high-value resistors.
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Industrial High-Gain Analog Front Ends
For industrial sensor transmitters operating from -40C to +125C, the OPA396 provides high-gain amplification with 1.2 uV/C offset drift, so calibration survives wide temperature swings. Supplied from a 3.3 V or 5 V rail, it amplifies millivolt-level sensor signals 50x to 100x while consuming only 23.5 uA, useful in loop-powered and energy-constrained field instruments. The class-AB rail-to-rail output drives ADC inputs or filter stages, and its high speed-to-power ratio leaves closed-loop bandwidth margin even at gains of 100, keeping settling times short in multiplexed data-acquisition systems.
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추천 제품 요약
엔지니어링 참조 데이터: OPA396 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | OPA348DCKT | OPA391DCKT | MCP6001T-E/OT | MAX4230AUT+T |
|---|---|---|---|---|---|
| Package | SC-70-5 (DCK) | SC-70-5 (DCK) - same | SC-70-5 (DCK) - same | SC-70-5 (SOT-353) - same footprint class | SC-70-5 - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Microchip Technology | Maxim Integrated |
| Gain-Bandwidth | 1 MHz | 1 MHz | 100 kHz | 1 MHz | 10 MHz |
| Quiescent Current | 23.5 uA | 38 uA | 17.5 uA | 100 uA | 1.7 mA |
| Offset Voltage (max) | 100 uV | 500 uV | 120 uV | 4.5 mV | 1 mV |
| Input Bias Current | 10 fA | 1 pA | 10 pA | 1 pA | 1 pA |
| Supply Voltage Range | 1.7 V to 5.5 V | 2.5 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 6.0 V | 2.5 V to 5.5 V |
| I/O Type | RRIO | RRIO | RRIO | RRIO | RRIO |
주요 차별점
- Ultra-low 10 fA input bias current (vs MCP6001T-E/OT)
- Best speed-to-power ratio in class (vs MCP6001T-E/OT)
- Precision 100 uV max offset with 1.2 uV/C drift (vs OPA348DCKT)
설계 노트
Place a 0.1 uF ceramic decoupling capacitor within 2 mm of the V+ pin with a low-impedance via to ground. For transimpedance designs, add a guard ring driven by a low-impedance node at the same potential as the input around the IN+ / IN- traces to reduce PCB leakage, since the 10 fA bias current is meaningless if board leakage dominates. Keep feedback traces short and remove solder-mask under the high-impedance node for lowest leakage.
The 1 MHz gain-bandwidth imposes a stability constraint: in transimpedance amplifiers the feedback capacitor value must account for photodiode capacitance, roughly Cf = sqrt(Cin / (2*pi*Rf*GBW)). In high-gain (noise-gain > 10) configurations, closed-loop bandwidth shrinks proportionally - verify phase margin with the datasheet open-loop gain curves. Do not exceed 5.5 V absolute maximum supply; the 1.7 V minimum leaves little headroom at coin-cell end-of-life, so verify output swing requirements at 1.7 V.
Although quiescent current is only 23.5 uA, the class-AB output can deliver higher load-current pulses; current limiting is not a substitute for proper supply bypassing. For active filters, keep noise gain below the datasheet phase-margin limits at the target frequency. When driving capacitive loads directly, isolate with a small series resistor (e.g., 50-100 ohm) to prevent ringing, per the TI OPAx396 datasheet application section.
규정 준수 정보
RoHS compliant per TI product page for the OPA396 family; REACH/halogen details not stated in provided data.
