REF3425IDBVR - 2.5V, 6ppm/C Series Voltage Reference | TI
N.º da peça: REF3425IDBVR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.59 | $0,59 |
| 10 | $0.53 | $5,30 |
| 100 | $0.47 | $47,00 |
| 500 | $0.42 | $210,00 |
| 1.000 | $0.38 | $380,00 |
REF3425IDBVR Visão geral
A series voltage reference is a type of precision voltage reference IC that sources current to the load and requires an input supply greater than the output, unlike shunt references which need an external bias resistor. Within the power-management hierarchy, the series voltage reference sits alongside linear regulators as a precision analog building block, providing a stable known voltage from which ADCs, DACs, and analog sensors derive their measurement accuracy. The output accuracy of the entire data-conversion chain is ultimately limited by this reference.
Key features of the REF3425 include ultra-low 6 ppm/°C temperature drift for measurement stability across temperature, initial accuracy of ±0.05% (±1.25 mV), and a typical operating current below 95 µA - making it suitable for battery-powered portable equipment. Output noise is a very low 3.8 µVp-p/V, and the device can source up to 10 mA while maintaining output voltage stability. Low output-voltage hysteresis and low long-term drift further improve system reliability over the product lifetime.
The REF3425 is fabricated on a precision CMOS process. CMOS architecture minimizes quiescent power while preserving reference integrity, and the device includes an enable (EN) pin for system power sequencing and further standby-power reduction. According to the TI datasheet, the REF34xx family offers pin-to-pin replacement for MAX6071 and ADR3425, giving designers a second source with enhanced specifications in the same small SOT-23 footprint.
Typical applications include high-resolution data acquisition systems feeding ADCs such as the ADS1287 and ADS1112, DAC biasing for parts like the DAC8802, portable and battery-powered instrumentation where 95 µA quiescent current extends battery life, and factory automation sensor excitation requiring 6 ppm/°C drift performance.
Design considerations: ensure the input supply provides adequate headroom above 2.5V and place a 0.1 µF to 1 µF ceramic capacitor at both input and output pins close to the device. The enable pin should not be left floating in noise-critical designs.
This page synthesizes distributor pricing, verified drop-in alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet, giving engineers a single citable resource for the REF3425IDBVR.
Alternativas drop-in para REF3425IDBVR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
REF3425QDBVRQ1
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
REF3225AIDBVR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX6071A25+T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADR3425ARMZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LT1790ACS6-2.5
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
REF3425IDBVR Classificações máximas e características elétricas
| Reference Type | Series Voltage Reference |
| Tensão de saída | 2.5 V (fixed) |
| Initial Accuracy | ±0.05% |
| Temperature Drift | 6 ppm/°C |
| Output Current | up to 10 mA |
| Operating Supply Current | less than 95 µA |
| Ruído de saída | 3.8 µVp-p/V |
| Output Voltage Hysteresis | low (low hysteresis per datasheet) |
| Pino de habilitação | Yes (EN) |
| Faixa de temperatura de operação | -40°C to +125°C |
| Encapsulamento | SOT-23-6 (DBV), 6 pins |
| Tipo de montagem | Surface Mount |
| Nível MSL | 2 (250°C, 1 year) |
| Status RoHS | Compliant |
| Process Technology | Precision CMOS |
| Drop-in Replacements (per TI) | MAX6071, ADR3425 pin-compatible |
Configuração de pinos do REF3425IDBVR
| Pino 1 | OUT — 2.5V reference output |
| Pino 2 | GND — Ground |
| Pino 3 | NC — Not connected (per datasheet) |
| Pino 4 | NC — Not connected (per datasheet) |
| Pino 5 | EN — Enable input (active high) |
| Pino 6 | IN — Input supply voltage |
Aplicações típicas
REF3425IDBVR é adequado para 6 aplicaçãos: Precision Data Acquisition Systems, Portable and Battery-Powered Instrumentation, DAC Biasing and Analog Output Modules, Industrial Automation and PLC Analog Inputs, Medical and Diagnostic Equipment, Sensor Excitation and Bridge Measurement.
Precision Data Acquisition Systems
The REF3425IDBVR is an ideal reference for high-resolution data acquisition because its 6 ppm/°C drift and ±0.05% initial accuracy keep full-scale error well below 1 LSB of 16- to 24-bit converters. The TI datasheet explicitly lists compatibility with ADCs such as the ADS1287 and ADS1112. In a typical DAQ channel, the 2.5V output drives the ADC reference pin with a 1 µF output capacitor, while the sub-95 µA supply current keeps self-heating - and therefore drift-induced error - negligible. The low 3.8 µVp-p/V output noise preserves signal-to-noise ratio, so the converter's dynamic range is limited by the analog front end rather than the reference.
Recomendado
Portable and Battery-Powered Instrumentation
Battery-powered field instruments need reference accuracy without sacrificing runtime, and the REF3425IDBVR addresses both: quiescent current is below 95 µA, and the EN pin lets the MCU gate the reference off during sleep, cutting average consumption further. With a 2500 mAh cell, continuous 95 µA reference draw represents only about 0.2 mW - a fraction of typical system budgets. The 6 ppm/°C drift maintains calibration across outdoor temperature swings from -40°C to +85°C, and the small SOT-23-6 (DBV) footprint fits space-constrained handheld PCBs. Compared with a shunt reference, the series topology needs no bias resistor, saving additional current and board area.
Recomendado
DAC Biasing and Analog Output Modules
Multiplying and string DACs such as the DAC8802 - named in the TI REF34 datasheet as compatible - require a stable reference for their full-scale output accuracy. The REF3425IDBVR's ±0.05% initial accuracy minimizes full-scale gain error before calibration, and its 10 mA source capability handles the dynamic reference current a DAC draws during code transitions without drooping. The low output-voltage hysteresis and low long-term drift mean the analog output module stays within calibration over years of 24/7 industrial operation. Place a 1 µF capacitor at the reference pin to buffer transient reference currents during fast output slewing.
Recomendado
Industrial Automation and PLC Analog Inputs
PLC analog input cards convert 4-20 mA loop currents and 0-10 V process signals into digital values, and the accuracy of the reference sets the floor for the entire channel. The REF3425IDBVR's 6 ppm/°C drift guarantees the calibration holds across factory floor temperature swings, while ±0.05% initial accuracy reduces or eliminates the cost of per-unit gain calibration. The -40°C to +125°C industrial rating covers cabinet-mounted electronics near drives and heat sources. Its CMOS architecture provides low noise (3.8 µVp-p/V) so precision front-end amplifiers ahead of the ADC are not the noise bottleneck.
Recomendado
Medical and Diagnostic Equipment
Patient monitoring, biosignal acquisition, and diagnostic instrumentation demand references with low noise and predictable long-term behavior. The REF3425IDBVR's 3.8 µVp-p/V output noise preserves microvolt-level biosignals such as ECG and EEG, and its low long-term output drift keeps calibrated medical measurement chains within specification between service intervals. The 2.5V rail suits low-voltage, low-power portable medical designs, and the 95 µA operating current plus EN shutdown supports battery-powered ambulatory devices. The compact SOT-23-6 package also fits dense multi-channel acquisition boards where per-channel references improve isolation and accuracy.
Recomendado
Sensor Excitation and Bridge Measurement
Wheatstone bridge sensors - load cells, RTDs, pressure sensors - require an accurate, stable excitation source because bridge output scales directly with excitation voltage. The REF3425IDBVR provides 2.5V excitation with ±0.05% initial accuracy and 6 ppm/°C drift; with a ratiometric ADC connection, reference drift cancels entirely, and the 10 mA output capability comfortably drives standard 350 ohm bridges (about 7 mA draw). Low output hysteresis after thermal cycling prevents zero-point shifts in weighing and force-measurement equipment. Sub-95 µA quiescent current also suits battery-powered wireless sensor nodes with periodic bridge sampling.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para REF3425IDBVR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | REF3425QDBVRQ1 | REF3225AIDBVR | MAX6071A25+T | ADR3425ARMZ | LT1790ACS6-2.5 |
|---|---|---|---|---|---|---|
| Package | SOT-23-6 (DBV) | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same | SOT-23-6 - same | SOT-23-6 - same | SOT-23-6 - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices (Maxim) | Analog Devices | Analog Devices (LT) |
| Output Voltage | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Enable Pin | Yes (EN) | Yes (EN) | Yes (EN) | Yes (per REF34 pin compatibility) | Yes (per REF34 pin compatibility) | No (per TI: REF34xxT variant, no EN) |
| Automotive Grade (AEC-Q100) | No | Yes (Q1) | No | No (standard grade) | No | No |
Principais diferenciais
- Lowest drift in the drop-in group (vs ADR3425ARMZ)
- Tighter initial accuracy than the legacy TI REF32 family (vs REF3225AIDBVR)
- Automotive path with zero PCB change (vs REF3425QDBVRQ1)
- Trade-off: lower-grade competitor may win on noise specs (vs MAX6071A25+T)
Notas de projeto
Place a 0.1 µF to 1 µF ceramic capacitor directly at the IN pin and another at the OUT pin, as close to the device as the PCB allows. Connect the GND pin to a solid, low-impedance ground plane with a short, wide trace. Keep the 2.5V reference trace away from switching-regulator nodes and high-dV/dt digital lines; if routing is unavoidable, guard it with ground. Poor decoupling is the most common cause of elevated reference noise in production boards.
Verify the enable (EN) pin logic before substituting a competing part. The LT1790 pin-compatible variant has no EN pin, so a design that drives EN low for shutdown will behave incorrectly after substitution - the reference will stay on (or the pin will float, per the replacement's definition). Similarly, ensure EN is not left floating in noise-critical designs; drive it from a defined logic level. Confirm load current stays within the 10 mA source rating, or output regulation will degrade.
Estimated: at 5V input, 2.5V output into a 10 mA load, power dissipation is (5V - 2.5V) x 95 µA + (2.5V x 10 mA) ≈ 25 mW total. In the SOT-23 (DBV) package this produces a junction temperature rise of only a few degrees C above ambient, so no thermal management is required. However, avoid placing the reference adjacent to power components (LDOs, drivers) whose self-heating would shift the local ambient and add apparent drift to the reference output.
Informações de conformidade
RoHS compliant and MSL 2 (250°C, 1 year) per DigiKey/PartGenie compliance data. Standard grade is not AEC-Q100 qualified - use REF3425QDBVRQ1 for automotive.
