LT1037CH - 2.5nV/Hz Precision Low Noise Op Amp | Analog Devices
부품 번호: LT1037CH ✓ 활성LT1037CH 개요
An operational amplifier is an active semiconductor device that amplifies the difference between two input voltages. Precision low-noise op amps such as the LT1037 sit between general-purpose amplifiers and instrumentation-grade devices in the hierarchy: op amp -> voltage-feedback amplifier -> analog signal conditioning IC -> semiconductor. Within that class, the LT1037 family was designed to provide the lowest noise available in a monolithic amplifier, with wideband noise below that of a 400 ohm resistor and a 1/f corner frequency of only 2 Hz.
Key differentiating specifications include 10 uV maximum input offset voltage, 0.2 uV/degree C input offset drift, and 130 dB common mode rejection and power supply rejection ratio. Because the LT1037 is a decompensated amplifier, it is only stable for closed-loop gains of 5 or greater, which allows the 60 MHz gain bandwidth product to be traded for very low noise at the input. It is unity-gain stable in a follower configuration only when a gain of 5 or more is used.
Internally the LT1037 uses a low-noise bipolar input stage and a precision trim of the input offset voltage with two offset null terminals, pins 1 and 5. The generous supply range supports dual supply operation, and the hermetic TO-5 metal can gives consistent performance in laboratory and instrumentation environments where thermal stability and low drift over time matter more than board area.
Typical applications include audio preamplifiers, low-level strain gauge and thermocouple signal conditioning, precision instrumentation amplifiers, seismic and geophone measurement front ends, low-level transducers, and reference buffer circuits for high-resolution data converters.
A key design consideration is that the decompensated architecture requires a closed-loop gain of at least 5, so the feedback network values must be chosen carefully; a unity-gain buffer configuration will oscillate unless a gain-setting network is added. Offset null should be used only when trimming is genuinely required, since the internal trim can degrade noise and drift stability.
This page consolidates manufacturer specifications, distributor pricing as of 2026-10-30, drop-in replacement options in the same TO-5 footprint, and practical design notes that are not found together in a single manufacturer document.
드롭인 대체품: LT1037CH — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: LT1037CH (동일 폼 팩터 및 풋프린트) — 차이점: Gain Bandwidth Product, Input Offset Drift, Input Offset Voltage, Mounting Type, Operating Temperature Range.
LT1037AH
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
LT1036CH
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
LT1007CH
✅ 드롭인 ⚠️ 사양 미검증가격 문의
데이터시트 보기 →OP27AJ/883C
✅ 드롭인가격 문의
데이터시트 보기 →OP37
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LT1037CH 최대 정격 & 전기적 특성
| Amplifier Type | Operational Amplifier, 1 Circuit, Decompensated (Gain >= 5) |
| Wideband Input Noise Density | 2.5 nV/sqrt(Hz) typical |
| 0.1 Hz to 10 Hz Noise | 60 nVp-p typical |
| Noise Density at 10 Hz | 4.5 nV/sqrt(Hz) guaranteed |
| Noise Density at 1 kHz | 3.8 nV/sqrt(Hz) guaranteed |
| 1/f Corner Frequency | 2 Hz |
| Input Offset Voltage | 10 uV |
| Input Offset Drift | 0.2 uV/degree C |
| Gain Bandwidth Product | 60 MHz (decompensated, gain >= 5) |
| Common Mode Rejection Ratio | 130 dB |
| Power Supply Rejection Ratio | 130 dB |
| Minimum Stable Closed-Loop Gain | 5 |
| Minimum Open-Loop Gain | 7,000,000 (guaranteed, RL = 2 kohm) |
| Offset Null Terminals | 2 (pins 1 and 5) |
| 동작 온도 범위 | Commercial grade |
| 패키지 | TO-5, 8-lead hermetic metal can, wire form |
| Number of Terminals | 8 |
| 실장 유형 | Through-hole |
LT1037CH 핀 구성
| 핀 1 | OFFSET NULL — Offset voltage null terminal (balances input offset) |
| 핀 2 | IN- — Inverting input |
| 핀 3 | IN+ — Non-inverting input |
| 핀 4 | V- — Negative supply (or ground in single supply operation) |
| 핀 5 | OFFSET NULL — Offset voltage null terminal (balances input offset) |
| 핀 6 | OUT — Output |
| 핀 7 | V+ — Positive supply |
| 핀 8 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
LT1037CH 적합 용도: 6 애플리케이션s: Audio Preamplifier and Low-Level Signal Stage, Strain Gauge and Load Cell Instrumentation, Thermocouple and Low-Level Sensor Signal Conditioning, Seismic, Geophone and Vibration Measurement, Precision ADC Reference and Buffer Stage, Laboratory and Test & Measurement Front End.
Audio Preamplifier and Low-Level Signal Stage
The LT1037CH suits audio preamplifier front ends where source impedances are in the few hundred ohm range and the amplifier must add negligible noise of its own. Its 2.5 nV/sqrt(Hz) wideband noise is below the thermal noise of a 400 ohm resistor, so in a phono stage or a low-impedance microphone preamp the amplifier contributes almost nothing to the total noise floor. The 60 nVp-p 0.1 Hz to 10 Hz noise specification keeps rumble-region gain out of the signal path, and the 10 uV offset with 0.2 uV/degree C drift protects DC-coupled audio paths from drift-induced pops. Because the part is decompensated, the gain must be set to 5 or more, which is naturally satisfied by typical audio gain stages of 10 to 100.
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Strain Gauge and Load Cell Instrumentation
Strain gauge bridges and load cells typically produce full-scale signals of a few millivolts, making offset voltage and drift the dominant error sources rather than noise. The LT1037CH addresses this with 10 uV of input offset voltage, 0.2 uV/degree C of drift, and 7,000,000 minimum guaranteed open-loop gain, which keeps closed-loop gain error well under 0.01 percent even at a gain of 100. A 130 dB common mode rejection ratio rejects the large common mode voltage present on bridge excitation lines, and 130 dB power supply rejection prevents supply ripple from modulating the signal path. The decompensated topology demands a minimum closed-loop gain of 5, which is met by typical instrumentation gains of 100 or more, and the hermetic TO-5 can gives stable behaviour across wide ambient temperature changes in a factory floor environment.
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Thermocouple and Low-Level Sensor Signal Conditioning
Thermocouple outputs range from a few microvolts per degree C to tens of millivolts, so an amplifier with microvolt-level offset is mandatory. The LT1037CH offers 10 uV input offset voltage and 0.2 uV/degree C drift, which keeps the added error below 1 degree C in most K-type and J-type thermocouple arrangements after the usual cold junction compensation. Its 2.5 nV/sqrt(Hz) noise density keeps the amplifier from degrading the system resolution when a cold junction compensation IC such as the MAX31855 is paired with it. The 60 MHz gain bandwidth product allows wide bandwidth temperature control loops and fast settling after a cold junction reference update, while the minimum stable gain of 5 fits the gain of 100 to 1000 typically used in thermocouple amplifiers.
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Seismic, Geophone and Vibration Measurement
Geophone and seismometer sensors are low impedance, low frequency sources where the amplifier must not add in-band noise or phase shift. The LT1037CH offers a 2 Hz 1/f corner with 60 nVp-p 0.1 Hz to 10 Hz noise, which preserves the low frequency content of the seismogram, and its 130 dB common mode rejection keeps large ground-coupled common mode signals from swamping the sensor output. The 60 MHz gain bandwidth product means the amplifier can be used as a wideband decompensated gain block for vibration analysis bands extending well into the kilohertz range, while the requirement for a closed-loop gain of 5 or greater matches typical geophone preamp gains of 1000. The hermetic metal can also limits humidity-related drift, which matters for long-term field deployments.
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Precision ADC Reference and Buffer Stage
When driving the reference or input of a high resolution ADC, the amplifier must deliver low noise and stable DC accuracy without adding distortion. The LT1037CH provides 130 dB power supply rejection, so ripple from a switching reference supply or a digital section does not modulate the analog reference node, and its 10 uV offset and 0.2 uV/degree C drift establish a stable baseline for 16-bit and higher converters. The 2.5 nV/sqrt(Hz) noise density allows the same amplifier to buffer the reference of a high speed ADC where the 60 MHz gain bandwidth product provides useful settling margin. Note that the decompensated topology requires a gain of 5 or greater, so in a unity-gain reference buffer design the amplifier must be configured as a 1:5 or higher stage or replaced with a unity-gain-stable precision part.
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Laboratory and Test & Measurement Front End
Bench instruments such as bridge amplifiers, null detectors, and low level picoammeter front ends need amplifiers that add neither noise nor offset to the measurement. The LT1037CH with 2.5 nV/sqrt(Hz) wideband noise, 7,000,000 guaranteed minimum open-loop gain and 130 dB rejection figures gives a low noise floor over a wide measurement bandwidth, and the dual offset null terminals on pins 1 and 5 permit trimming of residual offset in laboratory builds where the extra trimming noise is acceptable. The hermetic TO-5 metal can provides a stable, sealed environment with excellent long-term drift behaviour for calibration equipment. Designers should keep the offset null pins open in production builds and use the offset null pins only for coarse trim, because resistive trims on pins 1 and 5 add noise and reduce the effective input noise performance of the LT1037CH.
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추천 제품 요약
엔지니어링 참조 데이터: LT1037CH — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LT1037AH | LT1036CH | LT1007CH | OP27 | OP37 |
|---|---|---|---|---|---|---|
| Package | TO-5, 8-lead metal can | TO-5, 8-lead metal can - same footprint | TO-5, 8-lead metal can - same footprint | TO-5, 8-lead metal can - same footprint | TO-5, 8-lead metal can - same footprint | TO-5, 8-lead metal can - same footprint |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Minimum Stable Closed-Loop Gain | 5 | 5 | 1 (unity-gain stable) | 1 (unity-gain stable) | 1 (unity-gain stable) | 5 (decompensated) |
| Temperature Grade | Commercial | Extended temperature grade variant | Commercial | Commercial | Commercial | Commercial |
주요 차별점
- Lowest wideband noise in a monolithic operational amplifier (vs OP37)
- Decompensated 60 MHz gain bandwidth product in a hermetic TO-5 (vs OP27)
- 130 dB common mode and power supply rejection (vs LT1036CH)
- Noise below the thermal noise of a 400 ohm resistor (vs LT1007CH)
설계 노트
The most common failure mode with the LT1037CH is closing the loop at a gain below 5, because the decompensated architecture has minimum phase at only higher closed-loop gains and will oscillate as a unity-gain follower. Always design the signal path for a gain of 5 or more, for example a non-inverting stage with R2/R1 set to at least 4, or a 1:5 inverting stage. If the application truly requires unity gain, the LT1007CH or OP27 in the same 8-lead TO-5 can is the correct substitute, since both are unity-gain stable on the identical footprint.
Keep the feedback network components and the input routing short and away from the supply pins, since the 60 MHz gain bandwidth product means stray capacitance in the feedback path can degrade phase margin. Because this is a low noise part, the TO-5 metal can is normally mounted directly into a grounded shield or socket with a solid ground plane to avoid triboelectric noise pickup at the input leads. Provide a clean local bypass capacitor at pin 7 and pin 4, since the 130 dB PSRR figure is only achieved with low impedance supply returns and adequate decoupling.
The offset null terminals on pins 1 and 5 are for coarse offset balancing only. Connecting a potentiometer or resistive network to these pins adds thermal noise and leakage paths directly at the amplifier input, which erodes the 2.5 nV/sqrt(Hz) wideband noise performance and the 60 nVp-p 0.1 Hz to 10 Hz figure. Leave pins 1 and 5 open in production designs and rely on the 10 uV specified offset and 0.2 uV/degree C drift, which are already sufficient for bridge, thermocouple and audio applications.
Estimated: with a dual supply of plus or minus 15 V and an output biased near ground, the amplifier dissipation is dominated by quiescent current and output stage current at the operating signal level. Because the LT1037 is a bipolar-input precision device with a quiescent current typically in the milliampere range, the metal can can reach moderate internal temperature at high ambient temperature; the hermetic TO-5 package is designed to conduct heat away through its leads into the socket or PCB. Avoid enclosing the device in a thermally insulating housing and keep airflow around the socket in dense analog chassis.
규정 준수 정보
No RoHS, REACH, lead-free, halogen-free or conflict minerals declarations for the LT1037CH were present in the manufacturer or distributor pages retrieved on 2026-10-30, so these fields are recorded as unknown rather than assumed. The hermetic TO-5 metal can construction is a legacy hermetic package style; request a current material compliance declaration from Analog Devices for regulated builds. AEC-Q100 qualification is not claimed for this part.
