INA101SG - Military High Accuracy Instrumentation Amplifier | TI
MPN： INA101SG ✗ 停產INA101SG 概覽
An instrumentation amplifier is a specialized differential amplifier designed to amplify the small difference between two input signals while rejecting any voltage common to both inputs. Within the signal-chain hierarchy (instrumentation amplifier -> precision differential amplifier -> operational amplifier -> analog front end), it provides the high common-mode rejection and high input impedance that single op-amp stages cannot achieve, making it the standard front end for bridge transducers and low-level sensor signals.
Key features of the INA101SG include its three-op-amp topology with laser-trimmed metal-film resistors integrated on a single monolithic die, which delivers the tight resistor matching responsible for 0.002% nonlinearity and high CMR at 60 Hz. Input impedance is approximately 10^10 ohms, so the device loads bridges and high-impedance sources negligibly. Gain is set by a single external resistor, and the ceramic DIP package supports hermetic, high-reliability military and aerospace assemblies.
The bipolar process and precision trimming give the INA101 family its signature combination of microvolt-level offset and sub-microvolt-per-degree drift. Compared with discrete three-op-amp front ends, the monolithic construction guarantees resistor ratio tracking over temperature, which is the dominant error source in precision differential measurements.
Typical applications include strain-gauge bridge amplification, thermocouple and RTD signal conditioning, and general-purpose data-acquisition front ends where low-level differential signals must be amplified with minimal added error.
Design-wise, keep gain-setting resistor leads short and use a Kelvin ground for the reference pin; offset and drift specifications are guaranteed only when the reference pin is driven from a low-impedance source.
This page synthesizes verified distributor data, family cross-references, and practical design guidance not consolidated in the manufacturer datasheet.
直接替換替代品，適用於 INA101SG — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： INA101SG （相同外形與佔位） — 差異在於 Package, Bandwidth, Mounting Type, Architecture, Common-Mode Rejection.
INA101SG1
✅ 直接替換📋 參考替代品（不在目錄中）
INA101SG-BI
✅ 直接替換📋 參考替代品（不在目錄中）
INA101AG
✅ 直接替換聯絡詢價
查看資料表 →INA101HP
✅ 直接替換聯絡詢價
查看資料表 →INA101KP
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
INA101SG 最大額定值與電氣特性
| 功能 | High Accuracy Instrumentation Amplifier |
| 拓撲 | Three-op-amp with laser-trimmed metal-film resistors |
| Input Offset Voltage (max) | 25 uV |
| Offset Voltage Drift (max) | 0.25 uV/C |
| Nonlinearity | 0.002% |
| Input Noise | 13 nV/Hz |
| Input Impedance | 10^10 ohm |
| Common-Mode Rejection | High CMR at 60 Hz (value per datasheet) |
| Bandwidth | 0.3 MHz |
| Gain Setting | Single external resistor |
| Temperature Grade | Military |
| 封裝 | 14-pin Ceramic DIP (CDIP-14) |
| 安裝類型 | Through-Hole |
| Number of Terminals | 14 |
INA101SG 14-pin ceramic dip (cdip-14) 腳位配置指南
INA101SG（14-pin ceramic dip (cdip-14) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： INA101SG.
請參閱 資料表 以查看完整腳位配置。
典型應用
INA101SG 適用於 6 應用s: Strain Gauge Bridge Amplification, Thermocouple Signal Conditioning, Industrial Data Acquisition Front End, Medical and Biopotential Instrumentation, Aerospace and Military Sensor Systems, RTD and Precision Process Transmitter Front End.
Strain Gauge Bridge Amplification
Strain-gauge bridges produce millivolt-level differential outputs riding on a large common-mode excitation voltage. The INA101SG addresses this directly: its 10^10 ohm input impedance negligibly loads the bridge, its 25 uV maximum offset keeps zero error small at high gains, and its high common-mode rejection at 60 Hz rejects line-frequency pickup that would otherwise swamp the signal. In a typical circuit the bridge excitation is 5 V or 10 V, the amplifier gain is set to 100 or 1000 with a single precision external resistor, and the 13 nV/Hz input noise keeps the resolved strain well below one microstrain for a 350-ohm bridge. In military and aerospace test articles, the hermetic ceramic DIP-14 package of the SG grade supports conformal and high-reliability assembly. Use a low-tempco gain resistor and a driven, low-impedance reference pin to preserve the 0.002% nonlinearity across the full output swing.
推薦
Thermocouple Signal Conditioning
Type K, J, and T thermocouples generate tens of microvolts per degree C, so amplifier offset and drift dominate measurement error. The INA101SG's 25 uV maximum offset and 0.25 uV/C maximum drift limit contributed error to a fraction of a degree even at gains of several hundred, while 13 nV/Hz input noise keeps the signal-to-noise ratio high across long thermocouple leads. The 10^10 ohm differential input impedance allows high-value input filtering resistors for RFI immunity without measurable gain error. Because the amplifier rejects common-mode noise at 60 Hz, it tolerates plant-floor environments where ground potential differences inject line-frequency interference into the thermocouple loop. Pair the INA101SG with a cold-junction compensation sensor and an ADC; the ceramic military-grade package also suits downhole, engine, and aerospace temperature-survey instrumentation where hermeticity is required.
推薦
Industrial Data Acquisition Front End
General-purpose data acquisition is a primary listed application of the INA101 family. Multiplexed channels carrying low-level sensor signals need a front end with high input impedance, microvolt offset, and strong common-mode rejection so that channel-to-channel ground differences do not corrupt readings. The INA101SG provides all three: 10^10 ohm inputs, 25 uV offset, and high CMR at 60 Hz, with 0.002% nonlinearity preserving end-to-end system accuracy at 12-bit resolution and beyond. Gain is reconfigured per channel with a single external resistor, or a multiplexed gain resistor bank can implement programmable gain. The 0.3 MHz bandwidth comfortably supports scanning rates typical of industrial DAQ while limiting noise bandwidth. In legacy military-standard DAQ racks, the CDIP-14 SG part maintains form, fit, and documentation continuity with original drawings, which is often the deciding factor in sustainment programs.
推薦
Medical and Biopotential Instrumentation
Biopotential signals such as ECG and EEG are tens of microvolts to millivolts in amplitude and ride on large electrode offset and mains common-mode voltages. The INA101SG's combination of 25 uV offset, 13 nV/Hz noise, high 60 Hz common-mode rejection, and 10^10 ohm input impedance makes it suitable for high-precision physiological bridge and low-level differential front ends in laboratory-grade medical instrumentation. Its 0.3 MHz bandwidth is far in excess of biopotential needs, so a low-pass filter after the amplifier defines the signal bandwidth and suppresses out-of-band noise. Designers must observe patient-safety leakage-current limits, which typically require isolation amplifiers or resistive input protection ahead of the instrumentation amplifier; the INA101SG itself is a legacy part, so modern medical designs should verify compliance requirements before reuse. The hermetic ceramic package benefits reusable clinical equipment subject to repeated sterilization cycles.
推薦
Aerospace and Military Sensor Systems
The SG suffix designates a military temperature grade in a hermetic ceramic DIP-14, which is exactly what high-reliability aerospace and defense platforms require: immunity to moisture ingress, stable performance across extreme temperatures, and traceability under military procurement standards. Typical uses include strain and pressure monitoring on airframe test articles, low-level signal amplification in guided-weapon telemetry, and transducer conditioning in ground-based radar and fire-control systems. Electrical behavior matches the datasheet family figures: 0.25 uV/C drift keeps calibration intact across wide thermal swings, and 0.002% nonlinearity preserves accuracy through the full output range. Because the part is legacy, sustainment programs should qualify the same-pinout family members (INA101SG1, INA101AG, INA101HP) and broker sources early, and design any new-build military hardware around currently active TI instrumentation amplifiers wherever the specification permits.
推薦
RTD and Precision Process Transmitter Front End
Three-wire and four-wire RTD measurements need a front end that rejects lead-resistance common-mode error while amplifying a few hundred microvolts per degree C. The INA101SG's high input impedance and high 60 Hz common-mode rejection allow a simple current-excitation topology in which the RTD voltage is sensed differentially, with the 25 uV offset and 0.25 uV/C drift contributing error well below 0.1 degree C after calibration. A single gain resistor sets the span to match a 4-20 mA transmitter or a 0-5 V recorder output, and the 0.002% nonlinearity is negligible compared with the RTD's own characteristic. The 0.3 MHz bandwidth is easily filtered for field-noise immunity. In process industries the ceramic military package also tolerates high-vibration panels where plastic DIP solder joints may fatigue, extending service life in heavy-industrial installations.
推薦
推薦產品摘要
工程參考資料，適用於 INA101SG — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | INA101SG1 | INA101AG | INA101HP |
|---|---|---|---|---|
| Package | CDIP-14 (ceramic) | CDIP-14 - same | DIP-14 (plastic) - same pinout | DIP-14 (plastic) - same pinout |
| Brand | Texas Instruments (Burr-Brown) | Texas Instruments (Burr-Brown) | Texas Instruments (Burr-Brown) | Texas Instruments (Burr-Brown) |
| Input Offset Voltage | 25 uV max | 25 uV max | 25 uV max | 25 uV max |
| Nonlinearity | 0.002% | 0.002% | 0.002% | 0.002% |
| Bandwidth | 0.3 MHz | 0.3 MHz | 0.3 MHz | 0.3 MHz |
| Temperature Grade | Military | Military | Commercial | Industrial |
| Lifecycle Status | Legacy / broker channel | Legacy / broker channel | Legacy | Active (site listing) |
主要差異化特點
- Hermetic military-grade ceramic package (對比INA101HP)
- Ultra-low offset drift of 0.25 uV/C max (對比INA101SG-BI)
- 0.002% nonlinearity from monolithic laser-trimmed resistors (對比INA101AG)
設計說明
Drive the reference pin from a low-impedance source. Any resistance in series with the reference pin shifts gain because it unbalances the laser-trimmed internal resistor network, degrading CMR and the 0.002% nonlinearity. If the output must be offset, buffer the reference with a precision op amp such as the OPA2277. Keep gain-resistor connections short and routed away from switching noise; the 13 nV/Hz input noise is low enough that pickup on long gain leads becomes the dominant noise source in high-gain configurations.
Decouple both supplies with 0.1 uF ceramic capacitors placed within a few millimeters of the supply pins, plus a 10 uF bulk capacitor per board. Because this is a through-hole ceramic DIP, minimize trace length between the bridge or sensor and the inputs, and consider a guard ring driven by the input common-mode potential to reduce board-leakage errors at the 10^10 ohm input impedance. Sockets add thermoelectric offset - for 0.25 uV/C-class drift, solder the package directly and avoid dissimilar-metal junctions near the inputs.
Do not assume the SG's military-grade tested limits apply to lower-grade family members - the INA101AG and INA101HP have different tested limits and temperature ranges despite the same pinout. Also note the INA101SG is a legacy part sourced mainly through brokers: always request date codes, provenance documentation, and ideally sample-verify offset and CMR before inserting broker stock into a high-reliability build. Gain equations and grade limits differ across the datasheet's package options, so check the CDIP-14 section of the TI INA101 datasheet specifically.
合規資訊
Legacy military-grade ceramic DIP part; RoHS and lead-free status not stated in retrieved data. Military-grade through-hole parts of this vintage are typically non-RoHS hermetic ceramic construction - verify with the manufacturer before use in RoHS-restricted products.
