OPA404KP - Quad Difet Op Amp 6.4MHz 35V/us | Texas Instruments
부품 번호: OPA404KP ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $29.08 | $29.08 |
| 10 | $27.5 | $275.00 |
| 100 | $26.2 | $2,620.00 |
| 500 | $25.1 | $12,550.00 |
| 1,000 | $23.9 | $23,900.00 |
OPA404KP 개요
An operational amplifier (op amp) is a high-gain differential voltage amplifier used to perform analog signal conditioning tasks such as amplification, buffering, filtering, and integration. The OPA404 belongs to the precision amplifier hierarchy: operational amplifier -> precision JFET/Difet amplifier -> analog front-end IC. Quad devices integrate four matched amplifiers on one die, cutting board area and improving channel matching versus four single amplifiers.
Key features include 6.4MHz gain-bandwidth, 35V/us slew rate, +/-4pA maximum input bias current, +/-750uV maximum offset voltage, and 0.01% settling performance. The Difet (dielectrically isolated FET) process yields input bias currents orders of magnitude below bipolar designs while retaining wideband dynamics, so the part serves both precision DC and fast AC signal paths simultaneously.
The input cascode design maintains precision input specifications at high speed, unlike JFET parts such as the TL074 family, which trade precision for cost. Total supply voltage spans 10V to 36V, supporting +/-15V analog rails and single-supply operation from higher-voltage buses. The standard quad pinout allows direct upgrades of existing TL074/TL084 sockets to higher performance.
Typical applications include data acquisition front ends, active filters, photodiode transimpedance amplifiers, and test instrumentation signal chains where four channels must share consistent precision characteristics.
Design consideration: with 35V/us slew rate, layout and supply decoupling matter - place 0.1uF ceramic capacitors close to each supply pin, and watch output current limits when driving capacitive loads.
This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet, as of 2026-09-13.
드롭인 대체품: OPA404KP — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: OPA404KP (동일 폼 팩터 및 풋프린트) — 차이점: Input Type, Mounting Type, Package, Supply Type.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
OPA404KPG4
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TLE2074CN
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TL074ACN
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
OPA404KP 최대 정격 & 전기적 특성
| Amplifier Type | Quad High-Speed Precision Difet Operational Amplifier |
| Number of Circuits | 4 |
| Gain Bandwidth Product | 6.4 MHz |
| Slew Rate | 35 V/us |
| Input Offset Voltage (max) | +/-750 uV |
| Input Bias Current (max) | +/-4 pA |
| Settling to 0.01% | 0.01% settling spec (datasheet value) |
| Total Supply Voltage (min) | 10 V |
| Total Supply Voltage (max) | 36 V |
| Supply Type | Dual or single supply |
| 패키지 | 14-PDIP |
| 실장 유형 | Through Hole |
| Input Type | Difet (FET input, cascode) |
| Pin Configuration | Standard quad op amp pinout |
| Manufacturer Series | OPA404 |
| Product Status | Active |
OPA404KP 핀 구성
| 핀 1 | OUT1 — Amplifier 1 output |
| 핀 2 | IN1- — Amplifier 1 inverting input |
| 핀 3 | IN1+ — Amplifier 1 non-inverting input |
| 핀 4 | V+ — Positive supply |
| 핀 5 | IN2+ — Amplifier 2 non-inverting input |
| 핀 6 | IN2- — Amplifier 2 inverting input |
| 핀 7 | OUT2 — Amplifier 2 output |
| 핀 8 | OUT3 — Amplifier 3 output |
| 핀 9 | IN3- — Amplifier 3 inverting input |
| 핀 10 | IN3+ — Amplifier 3 non-inverting input |
| 핀 11 | V- — Negative supply |
| 핀 12 | IN4+ — Amplifier 4 non-inverting input |
| 핀 13 | IN4- — Amplifier 4 inverting input |
| 핀 14 | OUT4 — Amplifier 4 output |
일반적인 애플리케이션
OPA404KP 적합 용도: 6 애플리케이션s: Data Acquisition Front Ends, Photodiode Transimpedance Amplifiers, Active Filter Networks, Instrumentation Signal Chains, Sample-and-Hold and Peak Detectors, Audio and Professional Signal Processing.
Data Acquisition Front Ends
The OPA404KP fits multi-channel data acquisition systems because it provides four matched amplifiers with ±750uV maximum offset and 0.01% settling in one 14-PDIP package. Channel-to-channel matching on a single Difet die reduces calibration burden versus four discrete amplifiers, while the 6.4MHz bandwidth and 35V/us slew rate support fast settling ahead of successive-approximation ADCs. Used as unity-gain buffers or gain-of-10 stages between signal conditioning networks and the ADC driver, it preserves DC accuracy without sacrificing speed. The ±4pA maximum bias current keeps source loading negligible even with high-impedance inputs.
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Photodiode Transimpedance Amplifiers
In transimpedance amplifiers, error is dominated by input bias current flowing through the large feedback resistor; the OPA404KP's ±4pA maximum bias current (Difet input) keeps this error minimal, enabling megohm-range feedback resistors for low-light detection. The 6.4MHz bandwidth and 35V/us slew rate accommodate fast photodiode pulses in optical receivers and pulse-detection systems. A quad package allows four parallel detector channels with matched characteristics, simplifying ratiometric measurements. Compensation across the feedback element is straightforward given the amplifier's stable unity-gain behavior and moderate bandwidth.
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Active Filter Networks
Four amplifier channels in one package make the OPA404KP efficient for state-variable and multiple-feedback active filters, where each pole-pair typically consumes two op amps. The 6.4MHz gain-bandwidth exceeds the classical 100x rule-of-thumb margin for audio-band and low-MHz filters, minimizing Q distortion and corner-frequency error. Low ±750uV offset keeps DC offsets through cascaded filter sections controlled, and the ±4pA input current allows large-value precision resistors that shrink capacitor sizes. Standard quad pinout permits direct substitution into legacy TL074-based filter boards with immediate precision gains.
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Instrumentation Signal Chains
Bench and industrial instrumentation requires amplifiers combining DC accuracy with bandwidth, and the OPA404KP delivers both: ±750uV maximum offset, 0.01% settling, 6.4MHz bandwidth, and 35V/us slew rate in a 10V-36V total supply envelope compatible with ±15V analog rails. Four matched channels support simultaneous multi-parameter measurement front ends. The Difet input cascode preserves precision at speed, unlike commodity JFET quads that degrade accuracy at high frequencies. For instrumentation-instrument upgrades, the standard quad pinout enables drop-in socket replacement of legacy amplifiers without PCB redesign.
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Sample-and-Hold and Peak Detectors
Sample-and-hold circuits demand amplifiers with rapid slew to acquire signals plus extremely low input current so the hold capacitor does not droop. The OPA404KP addresses both: 35V/us slew rate shortens acquisition time, while ±4pA maximum bias current minimizes hold-capacitor discharge, supporting microsecond hold periods with modest capacitance values. The 0.01% settling specification ensures the held value is accurate to 10-bit-plus precision. Quad packaging allows a full four-channel sample-hold array on a single IC, improving channel matching in simultaneous-sampling systems.
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Audio and Professional Signal Processing
For high-end audio processing, the OPA404KP's quad format provides matched channels for stereo plus auxiliary paths, while the Difet input yields negligible bias-current-induced pops and DC offsets through coupling capacitors. The 6.4MHz bandwidth and 35V/us slew rate ensure full fast-rise transient reproduction with ample dynamic headroom, avoiding slew-induced distortion on high-amplitude high-frequency content. Offset of ±750uV max keeps DC at outputs low enough for direct-coupled designs with muting FETs. Designers upgrade legacy TL074ACN quad sockets with this part for an audible-accuracy improvement without layout changes.
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추천 제품 요약
엔지니어링 참조 데이터: OPA404KP — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | OPA404KPG4 | TLE2074CN | TL074ACN | OPA404KU |
|---|---|---|---|---|---|
| Package | 14-PDIP | 14-PDIP - same | 14-PDIP - same | 14-PDIP - same | SOIC-14 (different, SMT) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Gain-Bandwidth | 6.4 MHz | 6.4 MHz | 9.4 MHz | 3 MHz | 6.4 MHz |
| Slew Rate | 35 V/us | 35 V/us | 35 V/us | 13 V/us | 35 V/us |
| Total Supply Range | 10 V to 36 V | 10 V to 36 V | 10 V to 36 V | 10 V to 36 V | 10 V to 36 V |
| Number of Channels | 4 | 4 | 4 | 4 | 4 |
| Precision Class | Precision Difet (0.01% settling) | Precision Difet (identical) | General-purpose JFET | General-purpose JFET | Precision Difet (identical) |
주요 차별점
- Precision Difet input with ±4pA max bias current in a quad (vs TL074ACN)
- 0.01% settling specified (vs TLE2074CN)
- Standard quad pinout upgrade path (vs TL074ACN)
설계 노트
The OPA404KP requires a total supply of 10V to 36V and does not support rail-to-rail inputs or outputs - ensure input common-mode and output swing remain within the linear region defined in the manufacturer datasheet, especially on +/-9V minimum rails where headroom is tightest. Decouple each supply pin (pin 4 V+, pin 11 V-) with 0.1uF ceramic capacitors placed within a few millimeters of the PDIP, plus one 10uF bulk capacitor per board. On quad amplifiers, all four channels share the supply pins, so four-channel simultaneous switching can couple through the supply impedance.
Even in through-hole PDIP, precision matters: keep input traces short and guard high-impedance nodes (photodiode anodes, summing junctions) with a driven guard ring tied to the input's reference potential to exploit the ±4pA bias current spec. Leakage across the PCB can easily exceed picoampere bias current, so clean flux residue thoroughly or conformal-coat the input area. Ground the unused channels of a quad in a stable configuration (unity-gain follower with input at mid-supply) rather than leaving inputs floating.
Do not assume the OPA404KP is a simple TL074 substitute despite the identical pinout: its precision Difet input is more sensitive to electrostatic damage and PCB leakage, and its minimum 10V total supply rules out 5V single-supply operation. Verify the settling-time specification under your actual gain, load capacitance, and feedback network - datasheet 0.01% settling is measured under specific conditions. When driving significant capacitive loads, add an isolation resistor or a BUF634 buffer to avoid instability.
규정 준수 정보
Compliance status for the OPA404KP was not found in the provided verified data. The G4-suffixed variant (OPA404KPG4) is TI's standard marking for RoHS-compliant builds; confirm current status on the TI product page before design-in.
