OP284FSZ-REEL7 - Dual 4MHz Rail-to-Rail Op Amp | ADI
부품 번호: OP284FSZ-REEL7 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $8.78 | $8.78 |
| 10 | $7.91 | $79.10 |
| 100 | $7.04 | $704.00 |
| 500 | $6.16 | $3,080.00 |
| 1,000 | $5.49 | $5,490.00 |
OP284FSZ-REEL7 개요
A precision rail-to-rail operational amplifier (often shortened to RRIO op amp) is a linear amplifier whose input common-mode and output swing can traverse both supply rails, enabling maximum dynamic range in low-voltage single-supply systems. The OP284 belongs to the broader hierarchy of operational amplifiers -> amplifiers -> analog ICs -> signal conditioning, where it is positioned for applications that demand both ac precision (wide bandwidth, low distortion) and dc precision (low offset, low bias current) in one device.
Key features of the OP284FSZ-REEL7 include 4.25 MHz gain-bandwidth product, 4 V/us typical slew rate, 65 uV maximum input offset voltage, and rail-to-rail input and output operation on a single 3 V to 36 V supply. It is also characterized for low distortion and low noise, making it well suited for driving audio-class signal chains directly from low-impedance battery or USB rails.
The OP284 uses a bipolar transistor input stage combined with a complementary output stage to deliver true rail-to-rail input and output performance. Per the manufacturer datasheet, the part is specified for operation across the full industrial temperature range and is fabricated on ADI's precision bipolar process, which trades slightly higher input bias current for very low input offset voltage drift over temperature.
Typical applications include battery-powered instrumentation, portable audio front-end buffers, ADC and DAC driver circuits, active filter stages on a single supply, signal conditioning for industrial sensors (4-20 mA loops, strain gauges), and replacement of legacy OP-27-style amplifiers in modern single-rail designs. Its rail-to-rail swing also makes it attractive for multichannel data-acquisition front ends where every millivolt of headroom matters.
Designers should bias the unused channel in a dual part (tie the non-inverting input to mid-supply and let the output sit at the rail) to minimize quiescent current draw and to prevent the unused section from oscillating and injecting noise into adjacent channels.
This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet alone to accelerate component selection.
드롭인 대체품: OP284FSZ-REEL7 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
OP284FSZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OP284ESZ-REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OP284FS-REEL
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA2333AIDR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MCP6072-E/SN
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OP284FSZ-REEL7 최대 정격 & 전기적 특성
| Manufacturer | Analog Devices |
| Part Family | OP184 / OP284 / OP484 |
| Number of Channels | 2 (dual) |
| Amplifier Type | Precision, General Purpose |
| Input/Output Type | Rail-to-Rail (RRIO) |
| Gain Bandwidth Product (GBP) | 4.25 MHz |
| Slew Rate (SR) | 4 V/us typical |
| Input Offset Voltage (Vos max) | 65 uV to 100 uV |
| Supply Voltage Range (single supply) | 3 V to 36 V |
| 동작 온도 범위 | -40C to +125C |
| 패키지 / 케이스 | 8-SOIC (SOIC_N, 3.90 mm body width) |
| 실장 유형 | Surface Mount |
| Packaging | Tape & Reel (REEL7) |
| MSL 레벨 | 1 |
| RoHS 상태 | Compliant |
| 핀 수 | 8 |
OP284FSZ-REEL7 핀 구성
| 핀 1 | OUT A — Output, channel A |
| 핀 2 | -IN A — Inverting input, channel A |
| 핀 3 | +IN A — Non-inverting input, channel A |
| 핀 4 | V- — Negative supply (or GND for single supply) |
| 핀 5 | +IN B — Non-inverting input, channel B |
| 핀 6 | -IN B — Inverting input, channel B |
| 핀 7 | OUT B — Output, channel B |
| 핀 8 | V+ — Positive supply |
일반적인 애플리케이션
OP284FSZ-REEL7 적합 용도: 7 애플리케이션s: Battery-Powered Instrumentation, Audio Front-End Buffers and Active Filters, Industrial Sensor Signal Conditioning, Single-Supply ADC and DAC Buffers, Medical and Analytical Instrumentation, Active Filters and Integrators on a Single Supply, Replacing Legacy OP-27 in Modern Designs.
Battery-Powered Instrumentation
The OP284FSZ-REEL7's 3 V to 36 V single-supply range and 4.25 MHz bandwidth make it a strong fit for handheld battery instruments such as portable multimeters and field data loggers. A pair of op amps in the SOIC-8 package can build a two-channel differential gain stage with rail-to-rail input common-mode range, accepting sensor signals from 0 V to VCC without level shifting. The 65 uV input offset voltage keeps measurement error low on a 3.3 V or 5 V rail, while 4 V/us slew rate cleanly handles audio-bandwidth multiplexed outputs. Designers can sleep the inactive channel to draw less quiescent current during multi-second acquisition windows.
추천
Audio Front-End Buffers and Active Filters
The OP284FSZ-REEL7's 4.25 MHz GBP and 4 V/us slew rate, combined with rail-to-rail output swing, allow it to drive audio ADC inputs and to realize Sallen-Key or multiple-feedback low-pass filters in portable audio products. At a +/-5 V or +5 V single supply, the part delivers full 20 Hz-20 kHz audio bandwidth with low distortion, making it a good fit for headphone amplifier output buffers, line drivers, and active crossovers. The rail-to-rail input is helpful when the source signal may swing close to either rail of a low-voltage battery, eliminating the need for input coupling capacitors.
추천
Industrial Sensor Signal Conditioning
Industrial 4-20 mA loops, bridge pressure sensors, and thermocouple amplifiers often operate from 24 V industrial rails, where the OP284FSZ-REEL7's 36 V maximum supply and rail-to-rail input/output swing simplify stage design. The device can be configured as a differential gain block for strain-gauge bridges or as a current-loop transmitter with the output driving the loop directly. Its 65 uV input offset voltage is small relative to typical 4-20 mA span drops across 250 ohm sense resistors, preserving calibration accuracy across the -40C to +125C industrial temperature range.
추천
Single-Supply ADC and DAC Buffers
Single-supply ADC front ends and DAC output stages benefit from the OP284FSZ-REEL7's rail-to-rail input and output range, which preserves full-scale dynamic range when powered from 3.3 V or 5 V. The op amp can buffer SAR ADC inputs with its 4 MHz bandwidth, settle quickly for successive-approximation conversions, and ground-bias bipolar input signals without external level shifters. As a DAC output, the rail-to-rail swing reaches within tens of millivolts of either supply, maximizing usable dynamic range on low-voltage rails.
추천
Medical and Analytical Instrumentation
Benchtop analyzers and patient-monitoring front ends demand both low offset for accurate baseline measurements and ac precision to capture small physiological signals. The OP284FSZ-REEL7's 65 uV maximum offset, RRIO, and 4.25 MHz bandwidth satisfy these mixed-signal requirements while running from a single +5 V or +/-5 V supply in compact 8-SOIC boards. Two amplifier channels fit a pulse-oximetry or ECG front-end gain stage, followed by a discrete filter and an ADC, with the OP284 reducing BOM count versus discrete transistor designs.
추천
Active Filters and Integrators on a Single Supply
Active filter circuits - Sallen-Key low-passes, multiple-feedback band-passes, and integrator stages - benefit from the OP284FSZ-REEL7's 4 MHz GBP, which is well above the filter cutoff, and from rail-to-rail output, which keeps filter signals visible at the ADC input near supply rails. Single-supply operation simplifies biasing: filter bias networks can be a simple resistor divider mid-rail rather than a buffered virtual ground. Stable unity-gain operation makes Sallen-Key topologies straightforward.
추천
Replacing Legacy OP-27 in Modern Designs
Many legacy industrial designs based on the OP-27, LM11, or LT1012 can be refreshed with the OP284FSZ-REEL7, gaining rail-to-rail input and output and a single-supply 3 V to 36 V range. When dropping in for an OP-27 in an existing board, designers should check that the upstream source impedance is low (because the OP284's bipolar input stage draws more bias current than an OP-27's super-beta stage) and that no compensation capacitor on the existing OP-27 socket will destabilize the wider-bandwidth OP284. The 8-SOIC land pattern usually matches legacy 8-pin round outlines.
추천
추천 제품 요약
엔지니어링 참조 데이터: OP284FSZ-REEL7 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | OP284FSZ | OP284ESZ-REEL7 | OP284FS-REEL | OPA2333AIDR | MCP6072-E/SN |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Microchip Technology |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Channels | 2 | 2 | 2 | 2 | 2 | 2 |
| Supply Voltage (single) | 3 V to 36 V | 3 V to 36 V | 3 V to 36 V | 3 V to 36 V | 1.8 V to 5.5 V | 2.5 V to 6 V |
| Gain-Bandwidth Product | 4.25 MHz | 4.25 MHz | 4.25 MHz | 4.25 MHz | 350 kHz | 1.2 MHz |
| Slew Rate | 4 V/us | 4 V/us | 4 V/us | 4 V/us | 0.16 V/us | 0.5 V/us |
| Input Offset Voltage (max) | 65 uV | 65 uV | 65 uV | 65 uV | 15 uV | 150 uV |
| Rail-to-Rail I/O | Yes (RRIO) | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +85C | -40C to +125C | -40C to +125C |
주요 차별점
- Wide single-supply operating range (3 V to 36 V) (vs MCP6072-E/SN)
- 10x higher bandwidth and 8x faster slew rate than the TI OPA2333 (vs OPA2333AIDR)
- True rail-to-rail input without crossover distortion (vs older ADI OP-27 / OP-37 family)
설계 노트
When using the OP284FSZ-REEL7 in unity-gain buffer mode (follower), the input voltage range and output swing are both rail-to-rail, but the input bias current is bipolar and can reach hundreds of nanoamperes - keep the upstream source resistance below ~10 kohm to avoid offset drift from bias current multiplied by source resistance. If you must drive a higher impedance source, follow the OP284 with a precision dual like the AD8628 or add a bias-current cancellation network.
The 8-SOIC (3.90 mm body) package has a theta_JA of approximately 160 C/W on a standard JEDEC 2s2p test board, so at +125C maximum junction, the part dissipates roughly 625 mW of continuous power before thermal shutdown is risked. In practice, the OP284 only dissipates tens of milliwatts as it is a small-signal amplifier, but if VCC = +/-18 V and the output is short-circuited to GND or the opposite rail, the internal protection diodes may activate and thermal limiting may engage; use series output resistors or current-limiting if fault tolerance is required.
On a single 3.3 V supply the OP284FSZ-REEL7 draws several hundred microamps per channel, but unused channels should be biased in a defined state to avoid oscillation that can couple into the active channel. Tie the unused +IN to mid-supply via a resistor divider and leave the -IN tied to OUT, putting the unused amplifier into unity-gain follower at VCC/2; this minimizes quiescent draw and prevents crosstalk into the active channel through the shared substrate.
규정 준수 정보
The Z suffix in OP284FSZ-REEL7 denotes lead-free RoHS-compliant construction per Analog Devices' standard part-numbering convention. Automotive AEC-Q100 qualification is not stated in the datasheet for this commercial/industrial-grade part - consider the ADI automotive-grade program for AEC-Q100 needs.
