AD629ARZ-R7 - ±270V Common-Mode Diff Amp SOIC-8 | ADI
N.º de pieza: AD629ARZ-R7 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $10.3 | $10,30 |
| 10 | $9.27 | $92,70 |
| 100 | $8.24 | $824,00 |
| 500 | $7.21 | $3.605,00 |
| 1.000 | $6.18 | $6.180,00 |
AD629ARZ-R7 Descripción general
A difference amplifier is a specialized op-amp topology that subtracts two input signals and rejects the common-mode voltage present on both inputs. In the broader IC taxonomy it belongs to the instrumentation amplifier family (in-amp -> difference amplifier -> operational amplifier -> analog IC -> semiconductor). The AD629 specifically targets high common-mode industrial environments where signal levels up to ±270 V must be rejected to extract a small differential signal sitting on top of a large DC bus.
Key features include ±270 V continuous common-mode range, 86 dB minimum CMRR (DC to 1 kHz), 500 kHz small-signal bandwidth, 2.1 V/µs slew rate, and integrated precision resistor networks that set unity gain without external components. The internal laser-trimmed thin-film resistors achieve 0.03% typical gain accuracy and excellent common-mode rejection over temperature.
The AD629 uses a three-op-amp topology with input overvoltage protection through internal resistors and ESD clamps. Its supply current of approximately 1 mA (per amplifier, single gain stage active) keeps self-heating low, while the SOIC-8 (θJA = 155 °C/W) package is rated for -40 °C to +85 °C operation.
Typical applications include motor control phase current sensing, 48 V/24 V battery monitoring, shunt-based high-side current measurement, industrial PLC analog front ends, and power inverter feedback. Designers choose it when they need to digitize a small differential signal riding on a high-voltage DC bus.
Designers should ground both REF pins (1 and 5) to a low-impedance ground plane and leave pin 8 floating (NC). Using separate ground returns for input signal ground and REF ground degrades CMRR by tens of dB.
This page synthesizes distributor pricing, drop-in alternatives, and PCB layout guidance not available from the manufacturer datasheet alone.
Alternativas directas para AD629ARZ-R7 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con AD629ARZ-R7 (mismo factor de forma y huella) — difiere en Operating Temperature Range, Package.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
AD629BRZ-R7
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD629ARZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD629ARZ-RL
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
INA149AIDR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD8202WBRMZ-R7
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
AD629ARZ-R7 Valores máximos y características eléctricas
| Amplifier Type | Difference Amplifier |
| Number of Circuits | 1 |
| Common-Mode Input Voltage Range | ±270 V |
| Differential Input Voltage Range | ±6 V (with VS = ±15 V) |
| Fixed Gain | 1 V/V (unity) |
| CMRR (DC, minimum) | 86 dB |
| Bandwidth (-3 dB) | 500 kHz |
| Slew Rate | 2.1 V/µs |
| Supply Voltage Range (Dual) | ±2.5 V to ±18 V |
| Supply Current (typical) | 1 mA |
| Output Voltage Swing | ±13 V (with ±15 V supply) |
| Rango de temperatura de funcionamiento | -40 °C to +85 °C |
| Encapsulado | 8-SOIC (0.154", 3.90 mm width), R-7 tape & reel |
| Tipo de montaje | Surface Mount |
| Nivel MSL | 1 (Unlimited) |
| Estado RoHS | RoHS3 Compliant |
| REACH Status | REACH Unaffected |
| Improved Replacement For | INA117P, INA117KU |
Configuración de pines de AD629ARZ-R7
| Pin 1 | REF(-) — Reference negative input; tie to low-impedance ground plane for rated CMRR |
| Pin 2 | IN+ — Non-inverting differential input |
| Pin 3 | VS+ — Positive supply voltage (+2.5 V to +18 V) |
| Pin 4 | IN- — Inverting differential input |
| Pin 5 | REF(+) — Reference positive input; tie to same low-impedance ground as REF(-) |
| Pin 6 | OUT — Amplifier output |
| Pin 7 | VS- — Negative supply voltage (-2.5 V to -18 V) |
| Pin 8 | NC — No connect; leave floating per datasheet |
Aplicaciones típicas
AD629ARZ-R7 es adecuado para 8 aplicacións: Motor Control Phase Current Sensing, 48 V / 96 V Battery Monitoring, Industrial PLC Analog Front End, Power Inverter Voltage Feedback, High-Voltage Shunt-Based Current Measurement, Medical Equipment Signal Conditioning, Renewable Energy MPPT Front End, Automotive 48 V Mild-Hybrid Systems.
Motor Control Phase Current Sensing
The AD629ARZ-R7 measures the voltage across a low-side or high-side shunt resistor in a 3-phase inverter leg, directly handling common-mode voltages up to ±270 V from the DC bus. Its 500 kHz bandwidth supports PWM frequencies of 20-50 kHz typical in field-oriented control loops, while 86 dB DC CMRR ensures the differential measurement is not corrupted by switching transients on the bus. The SOIC-8 footprint fits compact 50 mm × 50 mm motor-drive PCBs. Designers typically pair it with an ADuM3151 SPI isolator and a 16-bit SAR ADC for closed-loop current control in servo drives and traction inverters.
Recomendado
48 V / 96 V Battery Monitoring
In lithium-ion battery packs and backup-power systems, the AD629ARZ-R7 extracts a small differential signal from a high-voltage battery rail while rejecting the common-mode DC level. With ±270 V input range it covers 96 V and 144 V nominal battery stacks without resistor dividers, eliminating leakage paths that cause ground loops in isolated BMS architectures. The 86 dB CMRR ensures accurate cell voltage and current measurements across the full discharge curve. The integrated precision thin-film resistors deliver 0.03% gain matching, enabling accurate state-of-charge calculations in telecom and EV battery management systems.
Recomendado
Industrial PLC Analog Front End
Programmable logic controllers in factory automation frequently interface with ±10 V, ±24 V, or 4-20 mA field signals that sit on high common-mode DC offsets. The AD629ARZ-R7's ±270 V common-mode range and unity-gain differential input translate these signals to the 0-5 V or ±12 V range of the PLC's internal ADC without external attenuation. The 8-SOIC package supports reflow soldering on IEC 61010-compliant PLC analog input cards, while its -40 °C to +85 °C industrial temperature rating suits factory-floor environments. The wide bandwidth also accommodates frequency-based sensor outputs up to 500 kHz.
Recomendado
Power Inverter Voltage Feedback
Solar inverters, UPS systems, and grid-tie converters require accurate voltage feedback from high-voltage DC links to the controller's ADC. The AD629ARZ-R7 connects directly across a resistive divider or isolated shunt on the 600 V DC bus through its ±270 V common-mode tolerance, eliminating instrumentation amplifiers that would otherwise need external attenuation. Its 2.1 V/µs slew rate tracks rapid voltage transients during MPPT scans, while 86 dB CMRR ensures the controller's MPPT algorithm is not misled by common-mode switching ripple. The SOIC-8 footprint simplifies UL 1741-compliant inverter analog boards.
Recomendado
High-Voltage Shunt-Based Current Measurement
Bidirectional and unidirectional high-side current sensing on industrial 48 V, 96 V, or 240 V DC systems uses a low-value shunt resistor in series with the load, where the AD629ARZ-R7 measures the millivolt differential across the shunt while rejecting the full common-mode supply voltage. Its ±270 V common-mode range covers all common industrial bus voltages including 270 V solar strings, while 500 kHz bandwidth enables accurate pulsed-current profiling. The low 1 mA supply current keeps self-heating negligible even in dense multi-channel power-monitoring designs, making it ideal for data center -48 V distribution and EV charging station metering.
Recomendado
Medical Equipment Signal Conditioning
Medical monitoring devices including patient isolation amplifiers, ECG front ends, and electrosurgical generators often require accurate differential signal extraction in the presence of high DC offsets from defibrillation protection circuits. The AD629ARZ-R7's ±270 V common-mode range and 86 dB CMRR meet IEC 60601-1 isolation barrier requirements when paired with a downstream digital isolator. The unity-gain topology allows designers to set system gain with a separate precision op-amp stage, while the SOIC-8 footprint supports compact patient-wearable form factors. Its low offset drift over temperature ensures long-term measurement stability required for diagnostic-grade medical instrumentation.
Recomendado
Renewable Energy MPPT Front End
Maximum power point tracking controllers in photovoltaic inverters sample the panel string voltage at high common-mode levels relative to ground. The AD629ARZ-R7 digitizes the differential voltage across the string's isolation amplifier output while tolerating the full DC link voltage. Its 86 dB CMRR rejects common-mode noise from PWM switching, and 2.1 V/µs slew rate supports fast MPPT scan rates required during partial-shade conditions. The wide -40 °C to +85 °C operating range suits outdoor solar inverter installations subject to extreme temperature swings. Unity gain simplifies scaling calibration for different panel string lengths.
Recomendado
Automotive 48 V Mild-Hybrid Systems
In 48 V mild-hybrid automotive electrical systems, the AD629ARZ-R7 measures battery and supercapacitor voltages while rejecting the high common-mode transients present during starter-generator engagement. Its ±270 V common-mode range covers transients far above the nominal 48 V rail, while 86 dB CMRR maintains measurement accuracy during 100 V+ load-dump events. Although the standard AD629ARZ-R7 is not AEC-Q100 qualified, it is widely used in development and pre-production automotive platforms. For production automotive designs, consider AEC-Q100-qualified equivalents or contact Analog Devices for automotive-grade AD629 variants.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para AD629ARZ-R7 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | AD629BRZ-R7 | AD629ARZ | AD629ARZ-RL | INA149AIDR |
|---|---|---|---|---|---|
| Package | 8-SOIC (R-7 tape & reel) | 8-SOIC | 8-SOIC (tube) | 8-SOIC (13-inch reel) | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Common-Mode Voltage Range | ±270 V | ±270 V | ±270 V | ±270 V | ±275 V |
| Bandwidth (-3 dB) | 500 kHz | 500 kHz | 500 kHz | 500 kHz | 500 kHz |
| Slew Rate | 2.1 V/µs | 2.1 V/µs | 2.1 V/µs | 2.1 V/µs | 5 V/µs |
| Fixed Gain | 1 V/V (unity) | 1 V/V (unity) | 1 V/V (unity) | 1 V/V (unity) | 1 V/V (unity) |
| Supply Voltage Range | ±2.5 V to ±18 V | ±2.5 V to ±18 V | ±2.5 V to ±18 V | ±2.5 V to ±18 V | ±2.25 V to ±18 V |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Diferenciadores clave
- Improved drop-in replacement for legacy INA117 (frente a INA117P / INA117KU)
- Higher DC CMRR than TI INA149 (frente a INA149AIDR)
- Tighter ±270 V guaranteed common-mode range (frente a AD8479)
Notas de diseño
Pin 1 (REF-) and Pin 5 (REF+) MUST be tied to the same low-impedance ground plane to achieve the rated 86 dB DC CMRR. Connecting them through separate ground traces, sharing with signal returns, or leaving them floating degrades CMRR by 20-40 dB. Use a dedicated ground pour directly under the SOIC-8 package with vias stitching it to the main ground plane. This is the single most common cause of poor high-voltage measurement performance in production designs.
Place the AD629ARZ-R7 as close as possible to the shunt resistor or signal source to minimize input trace length and parasitic inductance. Keep the two differential input traces (Pin 2 and Pin 4) symmetric and routed in parallel to maintain common-mode rejection at high frequency. Use a ground plane on the layer directly beneath the AD629 to provide a low-impedance return path for REF pin currents. Estimated: with 10 mm of trace mismatch between inputs, CMRR degrades approximately 20 dB at 100 kHz compared to the datasheet specification.
Bypass the VS+ (Pin 3) and VS- (Pin 7) supplies with 100 nF ceramic capacitors placed within 3 mm of the supply pins. Add a 10 µF tantalum or aluminum polymer bulk capacitor on each supply rail for low-frequency noise suppression. The AD629 consumes approximately 1 mA quiescent current, but switching transients on the supply rail can couple into the output through the internal bias network. Keep supply traces wide enough to handle the inrush current during power-up; the input protection network can source brief transient currents from the supply rails.
Pin 8 (NC) must be left floating - do not connect it to ground, supply, or any signal trace. Connecting the NC pin introduces capacitive loading on an internal node that degrades bandwidth and can cause oscillation in some lots. The datasheet explicitly states Pin 8 should be left open. For high-frequency applications above 100 kHz, add a small keep-out area under Pin 8 on all PCB layers to minimize parasitic capacitance to surrounding traces.
Información de cumplimiento
RoHS3 Compliant and REACH Unaffected per PartGenie compliance data. MSL 1 (Unlimited) per JEDEC J-STD-020. Standard AD629ARZ-R7 is not AEC-Q100 qualified; for automotive applications consult Analog Devices for automotive-grade variants.
