LT665BIS6-1.25#TRMPBF - 1.25V Voltage Reference | Analog Devices
料号： LT665BIS6-1.25#TRMPBF ✓ 量产中LT665BIS6-1.25#TRMPBF 概述
A voltage reference is a specialized component that creates an accurate, stable voltage against which other circuit voltages can be measured or controlled. It belongs to the voltage-reference hierarchy within power-management and signal-conditioning semiconductors. The LT665BIS6-1.25#TRMPBF provides a compact reference source for ADCs, DACs, sensor interfaces, precision amplifiers, and low-power embedded systems.
The key verified features are the fixed 1.25 V output, ±0.1% initial accuracy, and 20 ppm/°C temperature drift. The LT6656 family is also described by Analog Devices as drawing less than 1 μA of supply current and operating with a supply voltage within 10 mV of the output voltage. The 1.25 V version uses a 2.2 V test supply in the cited datasheet excerpt, while the family documentation states operation from 1.5 V to 18 V depending on output option, load current, and temperature.
Because the reference is intended for precision analog systems, stable layout and decoupling are important. The manufacturer datasheet specifies a 0.1 μF input bypass capacitor within one inch of the input pin and recommends an additional 2.2 μF capacitor when source impedance is high or the reference drives heavy loads. These measures reduce supply noise and help preserve reference stability.
Typical applications include sensor signal conditioning, precision data acquisition, low-power instrumentation, industrial control, and battery-powered measurement systems. The small TSOT-23-6 package supports compact PCB layouts, while the low supply-current characteristic is useful when energy efficiency matters. The fixed 1.25 V output can serve as a convenient midpoint reference for analog systems operating from a higher supply rail.
When selecting a replacement, engineers should verify output voltage, accuracy grade, temperature coefficient, package, pinout, supply range, load capability, and capacitor requirements. LT6656AIS6-1.25#TRMPBF is a same-family part with tighter stated initial accuracy, but it should not be assumed to be a drop-in replacement without checking the relevant datasheet details. This page combines verified distributor information, manufacturer documentation, application guidance, and comparison notes for engineering review.
直接替换替代料： LT665BIS6-1.25#TRMPBF ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
LT6656AIS6-1.25#TRMPBF
✅ 直接替换📋 参考替代料（不在目录中）
LT1790BCS6-1.25#TRMPBF
✅ 直接替换📋 参考替代料（不在目录中）
LT1790BCS6-1.25#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LT1790BIS6-1.25#TR
✅ 直接替换📋 参考替代料（不在目录中）
LT665BIS6-1.25#TRMPBF 规格参数
| Product Type | Precision series voltage reference |
| 输出电压 | 1.25 V fixed |
| Initial Accuracy | ±0.1% |
| Temperature Drift | 20 ppm/°C |
| 电源电流 | Less than 1 μA |
| Load Current Rating | 5 mA |
| Minimum Supply Voltage | 1.5 V, dependent on output option and operating conditions |
| Maximum Supply Voltage | 18 V, dependent on output option and operating conditions |
| Near-Output Operation | Supply voltage can operate within 10 mV of output voltage |
| Test Supply for 1.25 V Version | 2.2 V |
| Input Bypass Capacitor | 0.1 μF |
| Additional Capacitor | 2.2 μF for high source impedance or heavy loads |
| 封装 | TSOT-23-6 |
| 安装类型 | Surface mount |
| Number of Leads | 6 leads |
| RoHS 状态 | Compliant |
| REACH Status | Compliant |
LT665BIS6-1.25#TRMPBF tsot-23-6 引脚配置指南
LT665BIS6-1.25#TRMPBF（tsot-23-6 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： LT665BIS6-1.25#TRMPBF.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LT665BIS6-1.25#TRMPBF 适用于 6 应用s: Precision ADC Signal Conditioning, Low-Power Sensor Interface, Battery-Powered Measurement Systems, Industrial Process Monitoring, Precision DAC and Signal-Output Systems, Low-Voltage Analog Control Loops.
Precision ADC Signal Conditioning
LT665BIS6-1.25#TRMPBF provides a fixed 1.25 V reference for ADC scaling, sensor biasing, and analog signal-conditioning circuits. Its ±0.1% initial accuracy makes it appropriate when the reference budget can tolerate that grade, while the listed 20 ppm/°C drift helps maintain stability across temperature changes. The TSOT-23-6 package supports compact layouts, and the 0.1 μF input bypass capacitor should be placed close to the device. Confirm the ADC’s input range, reference current, settling requirements, and system accuracy budget.
推荐
Low-Power Sensor Interface
A fixed 1.25 V reference is useful for bridge, resistive, and low-voltage sensor interfaces that require a predictable excitation or measurement midpoint. The LT6656 family’s less-than-1 μA supply-current characteristic helps preserve battery life when the reference is continuously powered. The target’s ±0.1% accuracy and listed 20 ppm/°C drift should be included in the sensor-system error budget. Use the specified bypass capacitor and verify that the sensor and instrumentation do not exceed the reference’s load-current capability.
推荐
Battery-Powered Measurement Systems
The LT665BIS6-1.25#TRMPBF suits portable measurement systems that need a stable 1.25 V reference from a higher battery-derived supply. Its low family supply current is valuable when standby power is important, and the compact TSOT-23-6 package leaves board area for sensing and signal-conditioning components. The 1.25 V output can serve as a common reference or midpoint, but the application must account for dropout, load current, startup behavior, and temperature drift. Confirm the complete battery voltage range against the device operating limits.
推荐
Industrial Process Monitoring
Industrial process-monitoring boards can use the 1.25 V output as a stable reference for slow-changing analog measurements, controller front ends, and calibration paths. The target’s ±0.1% initial accuracy is suitable for systems that include additional calibration and do not require the tighter ±0.05% grade listed for LT6656AIS6-1.25#TRMPBF. Its low supply demand helps limit auxiliary power in distributed sensing nodes. Validate long-term drift, operating temperature, noise, and load behavior over the actual industrial environment.
推荐
Precision DAC and Signal-Output Systems
The fixed 1.25 V output can establish a midpoint or calibration reference in precision DAC and controlled analog-output systems. The LT6656 family’s low supply current helps avoid unnecessary loading of upstream regulators, while the TSOT-23-6 footprint supports compact mixed-signal boards. Designers should evaluate reference noise, startup settling, output load, and the DAC’s allowable reference voltage. The supplied data does not specify noise density or long-term stability, so those parameters must be obtained from the manufacturer datasheet before precision signal-path use.
推荐
Low-Voltage Analog Control Loops
LT665BIS6-1.25#TRMPBF can provide a defined reference for low-voltage analog control loops, gain-setting networks, and threshold circuits. The 1.25 V level is convenient for systems powered from low-energy rails and can improve repeatability compared with using a general-purpose supply as a reference. The compact package minimizes routing overhead, but layout still needs short, quiet supply connections and the specified 0.1 μF bypass capacitor. Confirm operating-temperature limits and load transients before deploying it in closed-loop control.
推荐
推荐产品汇总
工程参考数据： LT665BIS6-1.25#TRMPBF ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LT6656AIS6-1.25#TRMPBF | LT1790BCS6-1.25#TRMPBF | LT1790BCS6-1.25#TRPBF | LT1790BIS6-1.25#TR |
|---|---|---|---|---|---|
| Reference Output Voltage | 1.25 V fixed | 1.25 V fixed | 1.25 V | 1.25 V | 1.25 V |
| Package | TSOT-23-6 | TSOT-23-6 | TSOT-23-6 | TSOT-23-6 | TSOT-23-6 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
关键差异点
- Same-family accuracy option （对比 LT6656AIS6-1.25#TRMPBF)
- Low-power reference family （对比 LT1790BCS6-1.25#TRMPBF)
- Documented decoupling implementation （对比 LT1790BCS6-1.25#TRPBF)
设计说明
Do not treat the listed 5 mA as the device’s supply-current requirement; the 5 mA value identifies load-current capability in the distributor listing, while the LT6656 family is described as drawing less than 1 μA of supply current. Also avoid selecting the LT6656AIS6-1.25#TRMPBF solely because it has the same nominal output and package. Its listed ±0.05% accuracy differs from the target’s ±0.1%, so verify the full LT6656 datasheet, pinout, temperature grade, and qualification requirements.
Place the specified 0.1 μF input bypass capacitor within one inch of the input pin and connect it with a short, low-impedance trace. Analog Devices recommends an additional 2.2 μF capacitor when the source impedance is high or the reference drives heavy loads. Keep the reference return path close to the device and avoid routing sensitive reference current near switching nodes or high-current outputs.
The 1.25 V reference requires a supply with sufficient headroom for the chosen LT6656 option; the supplied datasheet excerpt uses VIN = 2.2 V for the LT6656-1.25 test condition. Check minimum input voltage, dropout behavior, load current, and startup requirements at the actual temperature. A low-current reference is valuable in battery systems, but it does not remove the need to verify supply-range limits during transient battery droop.
For precision analog measurements, treat the reference as a sensitive analog node rather than a general supply rail. Route VOUT directly to the reference-consuming circuit, keep the output node compact, and isolate it from digital switching returns where practical. The supplied data does not provide output-noise or settling-time values, so evaluate those specifications in the manufacturer datasheet before using the reference in high-resolution signal paths.
合规信息
RoHS and REACH compliance are stated by the Abacus Technologies listing in the supplied cross-reference data. AEC-Q100 qualification, lead-free status, halogen-free status, and conflict-minerals status are not supplied and are therefore unknown.
