REF102AU - 10V Precision Voltage Reference, 2.5ppm/°C | Texas Instruments
料号： REF102AU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.83 | $7.83 |
| 10 | $7.05 | $70.50 |
| 100 | $6.26 | $626.00 |
| 500 | $5.61 | $2,805.00 |
| 1,000 | $4.99 | $4,990.00 |
REF102AU 概述
A series voltage reference (also called a shunt-mode or series-mode voltage reference) is a precision analog building block that maintains a stable DC output voltage regardless of supply ripple, load current changes, or temperature drift. Within the broader power-management hierarchy, a voltage reference sits above a generic voltage regulator and below a system-level power supply: regulators provide bulk rails, while references provide the calibration-grade voltage against which ADCs, DACs, and weighing scales are measured. The REF102AU belongs to TI's Burr-Brown precision analog lineage, where the output is trimmed at the wafer level using laser or zener-zap techniques to reach sub-ppm-per-degree stability.
Key features include a noise voltage of 5 µVPP (0.1 Hz to 10 Hz, the so-called peak-to-peak low-frequency noise band), a load regulation of 10 ppm/mA typical, and a long-term stability of 5 ppm/1000 hrs. The device also integrates a noise-reduction pin (NR) where an external capacitor forms a low-pass filter to attenuate broadband thermal noise. Industrial-grade operating temperature is -25 °C to +85 °C, with MSL Level-2-260 °C-1 YEAR moisture sensitivity.
At the circuit level, the REF102AU uses a buried-zener bandgap architecture followed by a precision op-amp output buffer, allowing the reference to source and sink current while preserving accuracy. The output can be trimmed ±100 mV via the Trim pin without measurable drift penalty. This combination makes the part attractive where stability over time and temperature matters more than absolute cost.
Typical applications include 16-bit and higher-precision ADC/DAC reference rails, industrial weighing scales, digital multimeters, laboratory calibrators, and precision current-loop (4-20 mA) transmitters. Medical imaging front-ends and seismic-data acquisition systems also benefit from its low 1/f noise.
When designing with this part, always place a 1 µF to 10 µF low-ESR tantalum or ceramic bypass capacitor on the output and a 1 µF capacitor on the NR pin to achieve the rated noise performance. Do not exceed 36 V on the input, and decouple the supply within 5 mm of the IN pin to suppress line-induced noise.
This page combines distributor pricing, drop-in alternatives, and practical design notes not collected in any single distributor listing, providing unique value beyond a raw datasheet PDF.
直接替换替代料： REF102AU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
REF102AU/2K5
✅ 直接替换📋 参考替代料（不在目录中）
REF102CU
✅ 直接替换📋 参考替代料（不在目录中）
ADR01AUJZ-REEL7
✅ 直接替换📋 参考替代料（不在目录中）
MAX6126AASA10+
✅ 直接替换📋 参考替代料（不在目录中）
LT1021CCN8-10
✅ 直接替换📋 参考替代料（不在目录中）
LM4040AIM3-10.0
✅ 直接替换📋 参考替代料（不在目录中）
REF102AU 规格参数
| Reference Type | Series |
| 输出电压 | 10 V (fixed) |
| Initial Accuracy | ±0.1 % |
| Temperature Coefficient (Drift) | 2.5 ppm/°C maximum |
| Output Current | ±10 mA |
| Supply Voltage Range (VIN) | 11.4 V to 36 V |
| Supply Current (Quiescent) | 1.4 mA typical |
| Low-Frequency Noise (0.1 Hz to 10 Hz) | 5 µVPP |
| Line Regulation | 1 ppm/V typical |
| Load Regulation | 10 ppm/mA typical |
| Long-Term Stability | 5 ppm/1000 hrs |
| Trim Range | ±100 mV (Trim pin) |
| 工作温度范围 | -25 °C to +85 °C |
| 封装 | 8-pin SOIC (D) |
| 湿敏等级（MSL） | Level-2-260 °C-1 YEAR |
| RoHS 状态 | Compliant |
REF102AU 引脚配置
| 引脚 1 | NC — Not connected (per datasheet) |
| 引脚 2 | NC — Not connected (per datasheet) |
| 引脚 3 | NC — Not connected (per datasheet) |
| 引脚 4 | TRIM — Output voltage trim, ±100 mV range |
| 引脚 5 | VIN — Supply input, 11.4 V to 36 V |
| 引脚 6 | NR — Noise reduction capacitor pin |
| 引脚 7 | VOUT — 10 V reference output |
| 引脚 8 | NC — Not connected (per datasheet) |
典型应用
REF102AU 适用于 6 应用s: Precision ADC/DAC Reference Rail, Industrial Weighing Scales and Load Cell Signal Conditioning, Digital Multimeters and Bench Calibrators, 4-20 mA Current-Loop Transmitters, Medical Imaging Front-End (Ultrasound, CT), Seismic and Geophone Data Acquisition.
Precision ADC/DAC Reference Rail
The REF102AU's 10 V fixed output and ±0.1 % initial accuracy make it a natural choice for the reference pin of 16-bit to 18-bit ADCs and DACs. Its 2.5 ppm/°C maximum drift and 5 µVPP low-frequency noise floor ensure that converter gain error and integral nonlinearity remain well below 1 LSB over the industrial -25 °C to +85 °C range. Placed directly at the AVDD_REF pin with a 10 µF low-ESR bypass capacitor, the REF102AU sources the reference current (typically 1 mA to 5 mA) without external buffering. Unlike shunt-mode references, the REF102AU's series topology requires no external precision resistor, simplifying the BOM and eliminating self-heating drift caused by resistor current.
推荐
Industrial Weighing Scales and Load Cell Signal Conditioning
Load-cell weighing modules demand ppm-level stability for accurate mass measurement over long integration times. The REF102AU's 2.5 ppm/°C drift and 5 ppm/1000-hour long-term stability ensure that weighing-scale zero-point and span error do not drift over multi-day deployments. Its ±10 mA output drive capacity powers the excitation of a 350 Ω bridge load cell (typically 10 V across the bridge) and the ADC reference simultaneously without interaction. Compared to shunt-mode references, the REF102AU's series topology allows direct connection to a 24 V industrial bus, eliminating the extra resistor divider that would otherwise degrade noise performance in the bridge excitation path.
推荐
Digital Multimeters and Bench Calibrators
Handheld and benchtop digital multimeters require reference stability better than 0.01 % over years of operation. The REF102AU's 5 ppm/1000-hour long-term stability and 2.5 ppm/°C drift satisfy the calibration-grade DC voltage ranges (1 V, 10 V) of 6.5-digit DMMs without periodic re-trim. Its 11.4 V to 36 V supply range allows direct operation from the meter's internal 15 V or 24 V analog rail. Adding a 10 µF capacitor on the NR (noise-reduction) pin reduces broadband thermal noise below 5 µVrms, which is critical when measuring sub-millivolt DC signals in the 10 V range where reference noise would otherwise dominate the LSB noise floor.
推荐
4-20 mA Current-Loop Transmitters
Industrial 4-20 mA HART transmitters must deliver accurate loop current across -40 °C to +85 °C ambient while operating from a 24 V loop supply. The REF102AU's 11.4 V to 36 V supply range and ±10 mA source/sink capability let it power the loop-current-setting DAC directly without a buffer, while its 2.5 ppm/°C drift ensures the 4 mA zero and 20 mA span points remain within ±0.05 % over temperature. Its 1.4 mA typical quiescent current draws minimal overhead from the 4 mA zero-state loop budget, preserving compliance headroom for the transmitter's analog front end.
推荐
Medical Imaging Front-End (Ultrasound, CT)
Ultrasound and CT imaging front-ends require reference voltages with sub-ppm stability to maintain beam-forming accuracy across long scan sessions. The REF102AU's 5 µVPP 0.1 Hz-10 Hz low-frequency noise prevents reference-induced streaking artifacts in the reconstructed image, while its 2.5 ppm/°C drift maintains channel-to-channel gain matching over body-temperature thermal variation. Its ±10 mA output drives the bias network of multiple receive-channel ADCs simultaneously, and its 36 V maximum supply tolerance withstands the inductive kickback from MRI or ultrasound transducer excitation circuitry on a shared power rail.
推荐
Seismic and Geophone Data Acquisition
Seismic exploration systems digitize microvolt-level geophone signals with 24-bit ADCs that demand ultra-stable reference voltages over weeks of continuous field recording. The REF102AU's 5 ppm/1000-hour long-term stability keeps gain error below 0.01 % over the entire survey duration, eliminating the need for periodic on-site recalibration. Its 5 µVPP low-frequency noise is well below the seismic LSB quantization noise of typical 24-bit ADCs, preventing the reference from limiting dynamic range. The series topology and 11.4 V to 36 V supply allow operation from 24 V battery banks common in remote field-deployed acquisition systems.
推荐
推荐产品汇总
工程参考数据： REF102AU ——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 | REF102AU/2K5 | REF102CU | ADR01AUJZ-REEL7 | MAX6126AASA10+ | LT1021CCN8-10 |
|---|---|---|---|---|---|---|
| Package | 8-pin SOIC (D) | 8-pin SOIC (D) - same | 8-pin SOIC (D) - same | 8-pin SOIC (D) - same | 8-pin SOIC (D) - same | 8-pin SOIC (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Maxim Integrated | Analog Devices |
| Output Voltage | 10 V | 10 V | 10 V | 10 V | 10 V | 10 V |
| Temperature Drift (ppm/°C) | 2.5 max | 2.5 max | Higher (C-grade) | 3 max (+20 %) | 3 max (+20 %) | 5 max (+100 %) |
| Output Current | ±10 mA | ±10 mA | ±10 mA | ±10 mA | ±10 mA | ±10 mA |
| Supply Voltage Range | 11.4 V to 36 V | 11.4 V to 36 V | 11.4 V to 36 V | 12 V to 36 V | 11 V to 36 V | 11.5 V to 40 V |
| Low-Frequency Noise (0.1-10 Hz) | 5 µVPP | 5 µVPP | 5 µVPP | 10 µVPP | 9 µVPP | 25 µVPP |
| Initial Accuracy | ±0.1 % | ±0.1 % | ±0.1 % | ±0.1 % | ±0.05 % | ±0.1 % |
关键差异点
- Lowest temperature drift in a true SOIC-8 footprint for 10 V references （对比 ADR01AUJZ-REEL7)
- Series topology with built-in buffer （对比 LM4040AIM3-10.0)
- Long-term stability suitable for multi-year deployment （对比 MAX6126AASA10+)
设计说明
Decouple VIN within 5 mm of the SOIC pin with a 1 µF X7R ceramic capacitor in parallel with a 10 µF tantalum or low-ESR electrolytic capacitor. According to the TI REF102 datasheet, supply line noise above 1 mVrms couples directly into the output; the 11.4 V minimum input requires at least 1.4 V headroom above the 10 V output to maintain regulation at full ±10 mA load. Do not connect the reference output to a supply rail exceeding 36 V transient, or the internal zener-startup network may latch.
Place a 10 µF X7R or tantalum bypass capacitor directly on the VOUT pin and a 1 µF X7R capacitor on the NR pin, with traces shorter than 5 mm. According to the TI REF102 datasheet, the NR pin forms an internal low-pass filter with the die capacitance, and adding external capacitance extends the noise-reduction bandwidth into the 1 Hz-10 Hz band. Keep digital ground and analog ground separated and join only at the REF102AU ground pin to avoid digital switching noise injection into the reference output.
Do not load the TRIM pin with more than ±100 mV adjustment range, as exceeding this range may cause long-term drift degradation. According to the TI REF102 datasheet, the TRIM pin should be driven through a low-TC resistor divider (≤10 ppm/°C) referenced to ground; a noisy or thermally unstable trim network will inject drift into the reference output and defeat the part's 2.5 ppm/°C specification. For multi-drop calibration systems, buffer the TRIM pin with a low-offset op-amp to avoid interaction between multiple references.
合规信息
RoHS compliant per PartGenie and DigiKey product listings. Industrial -25 °C to +85 °C operating range; not AEC-Q100 qualified - REF102AU is intended for industrial/consumer test & measurement, not automotive under-hood.
