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REF3012AIDBZR

1.25V Series VRef, 0.2% Acc, 50ppm/C, 42uA, SOT-23-3

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Pieza del fabricante：

REF3012AIDBZR

Paquete：

SOT-23-3 (2.92 x 1.30 x 1.00 mm, 1.27mm pitch)

Descripción

Productos

The REF3012AIDBZR from Texas Instruments is a 1.25V precision CMOS series voltage reference with 0.2% initial accuracy, 50ppm/C max drift, 42uA Iq, and SOT-23-3 package.

Especificaciones

Tipo	Precision CMOS Series Voltage Reference
Output Voltage	1.25V (fixed)
Initial Accuracy	0.2% (max)
Temperature Drift	50 ppm/C max (0 to 70C); 75 ppm/C max (-40 to 125C)
Input Voltage Range	1.8V to 5.5V
Corriente de reposo	42 uA (typical); 50 uA (max)
Corriente de salida	25 mA (max)
Dropout Voltage	1 mV (typical at zero load)
Output Noise (0.1-10Hz)	14 uVpp (typical)
Output Noise (10Hz-10kHz)	42 uVrms (typical)
Paquete	SOT-23-3 (DBZ)
Temperatura de funcionamiento	-40C to +125C

Características

1.25V fixed output with 0.2% initial accuracy
50 ppm/C max temperature drift (0 to 70C)
1mV typical dropout voltage
42uA typical quiescent current
25mA output current capability
No output capacitor required for stability
Tiny 3-pin SOT-23 package

Aplicaciones

Data acquisition ADC/DAC reference
Loop-powered industrial transmitters
Battery-powered portable instruments
Medical monitoring equipment

Introducción del producto:REF3012AIDBZR Presentación del producto

The REF3012AIDBZR from Texas Instruments is a 1.25V precision CMOS series voltage reference in a tiny 3-pin SOT-23 package. The A grade provides 0.2% initial voltage accuracy at 25C, and the I suffix indicates the industrial temperature range of -40C to +125C. The DBZ suffix denotes the SOT-23-3 package, and R indicates tape and reel packaging. The REF3012 is part of the REF30xx family that uses a CMOS bandgap architecture optimized for low power consumption (42uA typical quiescent current) and low dropout voltage (1mV typical at zero load). The 1mV dropout allows the reference to operate with the input voltage only 1mV above the 1.25V output, making it ideal for battery-powered applications where supply headroom is limited. The device does not require an output capacitor for stability, simplifying PCB layout and reducing component count in intrinsically safe and explosion-proof applications. The 25mA output current capability is sufficient to drive most ADC and DAC reference inputs. The 14uVpp low-frequency noise (0.1 to 10Hz) ensures stable conversion results in precision measurement systems.

Principio de funcionamiento:REF3012AIDBZR Principio de funcionamiento

The REF3012AIDBZR uses a CMOS bandgap voltage reference architecture. The core bandgap circuit generates a stable voltage by combining a proportional-to-absolute-temperature (PTAT) voltage with a complementary-to-absolute-temperature (CTAT) voltage from a forward-biased PN junction. When properly trimmed, the PTAT and CTAT temperature coefficients cancel, producing a nearly temperature-independent reference voltage. The REF30xx family implements this in a CMOS process, allowing the very low 42uA quiescent current compared to bipolar references that typically draw hundreds of microamps. The series reference topology includes an internal error amplifier and pass transistor that regulate the output voltage. The 1mV dropout voltage is achieved by using a low-threshold CMOS pass element that requires minimal headroom between input and output. The output stage is designed to be unconditionally stable without an external capacitor, achieved by ensuring the output impedance and error amplifier bandwidth create a single dominant pole within the feedback loop. Laser trimming of internal resistors sets the 1.25V output to 0.2% accuracy at the factory. The 50ppm/C temperature drift specification results from second-order curvature correction in the bandgap circuit.

Descripción de la clavija:REF3012AIDBZR Definición y funciones de las clavijas

Pin	Nombre	Tipo	Función
1	OUT	Salida	Reference voltage output (1.25V)
2	GND	Potencia	Suelo
3	EN	Potencia	Input supply voltage (1.8-5.5V)

Application Scenarios:In which products and applications isREF3012AIDBZR usado

3.3V system ADC reference for 12-bit data acquisition with 0.2% accuracy providing 0.5 LSB error at full scale
Loop-powered 4-20mA pressure transmitter with 42uA Iq minimizing total loop current budget
Battery-powered portable instrument with 1mV dropout allowing operation down to 1.251V input

Alternative Models:What chips are recommended as replacements for REF3012AIDBZR

Fabricante	Número de pieza	Paquete	Notas
TI	REF3030AIDBZR	SOT-23-3	3.0V output version
TI	REF3012AIDBVT	SOT-23-3	Cut tape version
TI	REF35125AIDBZR	SOT-23-3	Lower Iq (650nA), 6ppm/C drift
Maxim	MAX6126A21+	SOT-23-6	1.25V, lower noise, 2ppm/C
ADI	ADR3412ARJZ	SOT-23-3	1.25V, 7ppm/C, compatible