ADR5040AKSZ-REEL7 - 2.048V Shunt Voltage Reference | Analog Devices
N.º de pieza: ADR5040AKSZ-REEL7 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0.85 | $0,85 |
| 10 | $0.68 | $6,80 |
| 100 | $0.52 | $52,00 |
| 500 | $0.42 | $210,00 |
| 1.000 | $0.34 | $340,00 |
ADR5040AKSZ-REEL7 Descripción general
A shunt voltage reference is a two-terminal (plus ground) type of voltage reference that operates like a Zener diode: it regulates by shunting excess current to maintain a constant voltage across itself. Within the power management hierarchy, it sits under voltage references, which are critical subcomponents of power management IC systems, alongside series references and reference ICs used by ADCs and DACs. Shunt references require an external bias resistor and can be configured as either positive or negative references, making them highly flexible.
Key features of the ADR5040AKSZ-REEL7 include better than 0.2% initial accuracy (A grade), low temperature drift of 100 ppm/C over the -40C to +125C industrial temperature range, fast settling behavior, and micropower operation suited to battery-powered designs. The SC-70 package occupies roughly half the PCB area of a SOT-23, making it ideal for space-critical applications.
The ADR5040 family (ADR5040/ADR5041/ADR5043/ADR5044/ADR5045) spans output voltages of 2.048V, 2.500V, 3.000V, 4.096V, and 5.000V. Like a bandgap reference, the ADR5040 achieves its low drift through a precision bandgap core with curvature compensation, delivering stable output across load and temperature conditions at low cost. Because it is a shunt topology, the reference remains in regulation as long as bias current stays within the specified minimum and the 15 mA maximum.
Typical applications include portable battery-powered instrumentation, ADC/DAC voltage reference inputs in data converters, power supply voltage monitoring and supervision, and low-cost digital multimeters. The 2.048V output is a natural fit for ratiometric measurements with 2.048V-full-scale converters.
Design consideration: select a bias resistor so that, at minimum supply voltage and maximum load current, shunt current stays above the minimum regulation current; at maximum supply and minimum load, current must not exceed 15 mA. With a 5V rail and a 1k ohm resistor feeding a light load, shunt current is approximately 2.95 mA, safely within range.
This page synthesizes distributor pricing tiers, drop-in alternatives, practical design notes, and FAQ guidance not consolidated in the manufacturer datasheet.
Alternativas directas para ADR5040AKSZ-REEL7 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ADR5040AKSZ-R2
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADR5040AKSZ-REEL
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADR5041AKSZ-REEL7
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ADR5040ARTZ-REEL7
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LM4040AIX3-2.5+T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADR5040AKSZ-REEL7 Especificaciones
| Tensión de salida | 2.048 V (fixed) |
| Initial Accuracy (A grade) | ±0.2% |
| Topología | Shunt |
| Maximum Shunt Current | 15 mA |
| Temperature Coefficient | 100 ppm/C |
| Rango de temperatura de funcionamiento | -40C to +125C |
| Encapsulado | SC-70-3 (SOT-323) |
| Tipo de montaje | Surface Mount |
| Número de pines | 3 |
| Product Family | ADR504x (ADR5040/5041/5043/5044/5045) |
| Settling | Fast settling (per manufacturer datasheet) |
| Typical Application | Portable and space-critical designs |
| Packaging | Tape & Reel (REEL7) |
| Estado RoHS | Compliant |
| Manufacturer | Analog Devices Inc. |
Configuración de pines de ADR5040AKSZ-REEL7
| Pin 1 | GND — Anode / ground connection of the shunt reference |
| Pin 2 | NC — Not connected (per datasheet) |
| Pin 3 | VOUT — Cathode / 2.048V regulated output |
Aplicaciones típicas
ADR5040AKSZ-REEL7 es adecuado para 6 aplicacións: Portable Battery-Powered Instrumentation, ADC/DAC Voltage Reference for Data Converters, Power Supply Voltage Monitoring and Supervision, Low-Cost Digital Multimeters and Panel Meters, Industrial Sensor Signal Conditioning, Automotive and IoT Edge Nodes (temperature-rated sensing).
Portable Battery-Powered Instrumentation
The ADR5040AKSZ-REEL7 is explicitly designed by Analog Devices for space-critical, micropower applications, making it a natural reference for handheld meters, portable data loggers, and battery-powered sensors. Its 2.048V output pairs directly with low-voltage ADCs, and the small SC-70-3 footprint fits dense portable PCBs. Because it is a shunt reference, bias current can be budgeted in the microamp-to-milliamp range with an appropriate resistor, preserving battery life. Estimated: with a 3V coin cell and a 1M ohm bias resistor, reference bias is under 1 uA, negligible against typical mAh cell capacity. The 100 ppm/C drift keeps accuracy acceptable across portable environmental extremes.
Recomendado
ADC/DAC Voltage Reference for Data Converters
Data converters require a stable, low-noise reference for accurate conversions. The ADR5040AKSZ-REEL7 provides a 2.048V output that matches ratiometric full-scale inputs of many 10- to 16-bit ADCs, delivering ±0.2% initial accuracy and 100 ppm/C drift that support 11-12 effective-bit systems over temperature. Placed with a bias resistor from a 5V or 3.3V rail and a 0.1 uF decoupling capacitor at the converter REF pin, the shunt topology supplies a clean low-impedance reference without a series regulator. Its fast settling behavior benefits multiplexed input systems where the reference sees stepped loads. For higher-resolution 16-bit-plus designs, budget the drift carefully or step up to a series reference.
Recomendado
Power Supply Voltage Monitoring and Supervision
Shunt references are widely used as precision thresholds in voltage supervisors, comparators, and under/over-voltage detectors. The ADR5040AKSZ-REEL7's ±0.2% initial accuracy means a comparator trip point set against its 2.048V output has at most ±4.1 mV reference error, far tighter than a Zener diode. The 15 mA shunt capability allows direct drive of LED indicators or optocoupler LEDs in isolated monitoring circuits. In a typical undervoltage lockout circuit, the reference feeds one comparator input while a resistor divider from the monitored rail feeds the other; the 100 ppm/C drift keeps the threshold stable across -40C to +125C industrial conditions, making it suitable for 24V industrial bus supervision with proper dividers.
Recomendado
Low-Cost Digital Multimeters and Panel Meters
Cost-sensitive measurement products benefit from the ADR5040's combination of precision and price: distributor pricing runs well under $1 at unit volume (as of 2026-10-21) while still delivering ±0.2% accuracy and 100 ppm/C drift. In a DMM front end, the 2.048V reference defines the converter span, and the shunt topology tolerates the switched load transients typical of autoranging meters thanks to its fast settling. The SC-70-3 package conserves board area in handheld housings. For panel meters running from unregulated supplies, the reference tolerates supply variation as long as the bias resistor limits current below the 15 mA maximum, simplifying designs that lack tight supply regulation.
Recomendado
Industrial Sensor Signal Conditioning
Industrial transmitters and sensor conditioners operating over -40C to +125C require a stable reference for ADC conversion and current-loop scaling. The ADR5040AKSZ-REEL7's industrial temperature rating and 100 ppm/C drift support 4-20 mA transmitter designs where the 2.048V reference sets the DAC or ADC span. Its micropower operation suits loop-powered transmitters that must live within the 3.5 mA loop budget: a high-value bias resistor keeps reference consumption in the tens of microamps. The shunt configuration also permits referencing off the loop supply directly. Robustness and low cost allow high-volume industrial deployments without the budget of a precision series reference.
Recomendado
Automotive and IoT Edge Nodes (temperature-rated sensing)
IoT edge nodes and non-safety automotive subsystems need small, inexpensive, temperature-robust references. The ADR5040AKSZ-REEL7 operates to +125C, covers the -40C cold-crank range, and its SC-70-3 package fits highly integrated sensor nodes. The 2.048V reference is convenient for ratiometric measurement of battery voltage dividers via the node's microcontroller ADC. Estimated: a 12-bit ADC referenced at 2.048V resolves 0.5 mV per LSB, sufficient for battery-state monitoring with a resistor divider. The low cost supports high-volume node deployments, and the fast settling tolerates duty-cycled power gating where the reference is switched on only during measurements.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ADR5040AKSZ-REEL7 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ADR5040AKSZ-R2 | ADR5040AKSZ-REEL | ADR5041AKSZ-REEL7 | ADR5040ARTZ-REEL7 | LM4040AIX3-2.5+T |
|---|---|---|---|---|---|---|
| Package | SC-70-3 | SC-70-3 - same | SC-70-3 - same | SC-70-3 - same | SOT-23-3 - different footprint | SC-70-3 - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Voltage | 2.048 V | 2.048 V | 2.048 V | 2.500 V | 2.048 V | 2.500 V |
| Initial Accuracy | ±0.2% | ±0.2% | ±0.2% | ±0.2% | ±0.2% | ±0.1% |
| Temperature Coefficient | 100 ppm/C | 100 ppm/C | 100 ppm/C | 100 ppm/C | 100 ppm/C | 100 ppm/C |
| Max Shunt Current | 15 mA | 15 mA | 15 mA | 15 mA | 15 mA | 15 mA |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Lifecycle Status | Active | Active | Obsolete (excess stock only) | Active | Active | Active |
Diferenciadores clave
- 2.048V ratiometric-friendly output (frente a LM4040AIX3-2.5+T)
- Ultra-small SC-70 footprint (frente a ADR5040ARTZ-REEL7)
- Active lifecycle with same-die continuity (frente a ADR5040AKSZ-REEL)
Notas de diseño
Bias resistor selection is the single most important design decision with a shunt reference. Use R_bias = (V_supply_min - 2.048V) / (I_shunt_min + I_load_max) to guarantee regulation at worst case, then verify current at V_supply_max with minimum load stays below the 15 mA absolute maximum. Estimated example: 5V supply ±5% (4.75V-5.25V) with a 1 mA load calls for roughly 680 ohm-1 kohm, yielding 2.2 mA-4.7 mA shunt current - all within range.
Place a 0.1 uF ceramic capacitor directly across the reference output (cathode to anode) and close to the load's reference input pin to ensure stability and low broadband noise. The SC-70-3 footprint is tiny, so keep traces short and use a solid ground plane. If driving a switching ADC reference input, add 1 uF-10 uF of local reservoir capacitance to supply transient charge without disturbing the shunt operating point.
Do not confuse ADR5040 grading suffixes: AKSZ is the ±0.2% A grade, while other suffixes in the family denote different accuracy/tempco grades. Also remember the shunt topology sources no current - it can only absorb. If the load can present capacitive inrush or if the bias resistor is oversized at low supply, the reference falls out of regulation and output accuracy collapses. Verify startup behavior at minimum supply and maximum load on the bench.
Información de cumplimiento
RoHS compliant per DigiKey/Mouser listings. REACH, halogen-free, and conflict-minerals declarations not found in provided data - consult Analog Devices compliance portal.
