AD8227BRZ - Wide Supply Range In-Amp | Analog Devices
MPN: AD8227BRZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.85 | $4.85 |
| 10 | $4.37 | $43.70 |
| 100 | $3.95 | $395.00 |
| 500 | $3.4 | $1,700.00 |
| 1,000 | $2.95 | $2,950.00 |
Drop-in alternatives for AD8227BRZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD8226ARZ
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
AD8227ARZ
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$3.1 / Unit
View Datasheet →AD8228ARZ
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
AD620ARZ
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$7.2 / Unit
View Datasheet →INA128UA
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
INA826AIDR
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
AD8227BRZ Maximum Ratings & Electrical Characteristics
| Amplifier Type | Instrumentation Amplifier |
| Number of Channels | 1 |
| Gain Range | 5 to 1000 (set by one external resistor) |
| Bandwidth (G = 5) | 250 kHz |
| Input Offset Voltage | 100 µV (B grade) |
| CMRR (G = 5) | 80 dB |
| Quiescent Current | 700 µA |
| Single Supply Voltage Range | 4.5 V to 36 V |
| Dual Supply Voltage Range | ±2.25 V to ±18 V |
| Output Type | Rail-to-Rail |
| Input Voltage Range | Wide input range (beyond supply rails) |
| Operating Temperature Range | -40°C to +125°C |
| Package / Case | 8-SOIC (0.154", 3.90 mm Width) |
| Number of Pins | 8 |
| Mounting Type | Surface Mount |
| RoHS Status | unknown |
AD8227BRZ Pin Configuration
| Pin 1 | RG — Gain-setting resistor terminal |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | -VS — Negative supply or ground |
| Pin 5 | REF — Reference input for output level shifting |
| Pin 6 | OUT — Instrumentation amplifier output |
| Pin 7 | +VS — Positive supply |
| Pin 8 | RG — Gain-setting resistor terminal |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
AD8227BRZ is suitable for 6 applications: Industrial Process Control, Medical Instrumentation (ECG/EEG), Bridge Amplifier / Load Cell, Data Acquisition Systems, Battery-Powered Portable Instrumentation, Thermocouple and Temperature Sensing.
Industrial Process Control
The AD8227BRZ is ideal for industrial process control because its wide supply range of ±2.25 V to ±18 V or 4.5 V to 36 V directly interfaces with 24 V industrial rails. Its 80 dB CMRR at G = 5 rejects ground noise and common-mode interference from long sensor cables. In a typical transmitter loop, the in-amp conditions a 4-20 mA or mV-level sensor signal before driving an ADC such as the AD7172-2BRUZ. The single external gain resistor allows gain settings from 5 to 1000, covering thermocouple and strain-gauge ranges without additional components. The -40°C to +125°C temperature range ensures reliable operation in factory-floor environments.
Recommended
Medical Instrumentation (ECG/EEG)
In medical instrumentation such as ECG and EEG front ends, the AD8227BRZ amplifies microvolt-level biopotential signals while rejecting common-mode mains interference. The 100 µV input offset voltage and 80 dB CMRR at G = 5 provide accurate base-line performance. The rail-to-rail output maximizes dynamic range for the subsequent ADC, for example the AD7768-4BSTZ 24-bit converter. Low 700 µA quiescent current also supports battery-operated patient monitors. The single-resistor gain programmability allows different lead configurations to be accommodated with one BOM. For multi-channel designs, the AD8227BRZ can be paired with precision op amps such as the ADA4522-2ARZ for driven-right-leg or filtering stages.
Recommended
Bridge Amplifier / Load Cell
The AD8227BRZ is well suited for load cell and strain-gauge bridge amplifiers because its differential input directly measures the bridge output. The wide input range allows the amplifier to handle bridge excitation voltages on 5 V or 24 V systems, and the high CMRR rejects common-mode voltage between the bridge half-bridge nodes. With a gain set from 5 to 1000 using one external resistor, the user can scale the bridge output to match a downstream ADC full-scale range. The rail-to-rail output stage preserves signal headroom, making it easier to interface with single-supply ADCs. A typical signal chain connects the AD8227BRZ output to the AD7172-2BRUZ differential input for precise weight or force measurement.
Recommended
Data Acquisition Systems
In a data acquisition system, the AD8227BRZ conditions small differential signals from sensors before analog-to-digital conversion. Its 250 kHz bandwidth at G = 5 supports moderate-speed multiplexed measurements, while the gain range of 5 to 1000 allows different sensor types to be accommodated with one design. The wide supply range lets the in-amp share the same ±15 V rails as the rest of the analog front end. The rail-to-rail output can directly drive the input of a precision ADC such as the AD7606BSTZ-4RL or AD7175-2BRUZ. For multi-channel DAQ cards, several AD8227BRZ amplifiers can be arrayed, and the low 700 µA quiescent current helps manage thermal budget in densely populated cards.
Recommended
Battery-Powered Portable Instrumentation
The AD8227BRZ is an excellent choice for battery-powered portable instruments because of its 700 µA quiescent current and wide 4.5 V to 36 V single-supply operation. This allows direct operation from a 9 V battery or a 5 V regulated rail while preserving the signal conditioning accuracy needed in handheld meters. The rail-to-rail output maximizes ADC input range, improving resolution in a low-voltage system. The device's small 8-SOIC package minimizes board area. When paired with the ADA4522-2ARZ and AD7172-2BRUZ, the complete signal chain can be built for measurement of temperature, pressure, or pH in a compact, low-power instrument.
Recommended
Thermocouple and Temperature Sensing
For thermocouple and temperature sensing, the AD8227BRZ provides the differential gain needed to amplify the small mV-level Seebeck voltage. Its high CMRR rejects common-mode ground noise in industrial environments, and the wide input range allows direct connection to thermocouple junctions with large common-mode voltages. A single external resistor sets the gain to match the thermocouple type and temperature range. The output can be digitized by the AD7172-2BRUZ or another precision ADC, while a reference such as the REF192ESZ provides a stable bias for cold-junction compensation. The -40°C to +125°C operating range covers both the sensor environment and the control electronics.
Recommended
Recommended Products Summary
Engineering reference data for AD8227BRZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8226ARZ | AD8227ARZ | AD8228ARZ | AD620ARZ | INA128UA | INA826AIDR |
|---|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Gain Range | 5 to 1000 (external resistor) | 1 to 1000 (external resistor) | 5 to 1000 (external resistor) | Fixed 5, 10, or 100 | 1 to 1000 (external resistor) | 1 to 1000 (external resistor) | 1 to 1000 (external resistor) |
| Bandwidth | 250 kHz at G = 5 | 1.5 MHz at G = 1 | 250 kHz at G = 5 | [DATA_NEEDED] | 120 kHz at G = 100 | 200 kHz at G = 5 | 1 MHz at G = 1 |
| Input Offset Voltage | 100 µV max (B grade) | 100 µV max | 125 µV max (A grade) | 90 µV max | 50 µV max | 50 µV max | 100 µV max |
| CMRR | 80 dB at G = 5 | 80 dB at G = 5 | 76 dB at G = 5 (A grade) | 90 dB at G = 10 | 93 dB at G = 10 | 120 dB at G = 100 | 90 dB at G = 10 |
| Quiescent Current | 700 µA | 700 µA | 700 µA | 700 µA | 900 µA | 700 µA | 200 µA |
| Single Supply Range | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V | 4.6 V to 36 V | 4.5 V to 36 V | 2.7 V to 36 V |
Key Differentiators
- Low cost and wide supply range with one-resistor gain setting (vs AD8226ARZ)
- 100 µV B-grade input offset voltage in a low-cost in-amp (vs AD8227ARZ)
- Wide single-supply operation down to 4.5 V and up to 36 V (vs INA826AIDR)
Design Notes
Place 0.1 µF ceramic decoupling capacitors as close as possible to the +VS (pin 7) and -VS (pin 4) pins. A 10 µF bulk capacitor may be added on the supply rail for larger load transients. Keep the gain-setting resistor RG close to pins 1 and 8 to minimize parasitic capacitance and to reduce gain error caused by trace resistance.
The REF pin (pin 5) must be driven from a low-impedance source to maintain CMRR. If the REF pin is left floating or driven from a high impedance, common-mode rejection will degrade significantly. For single-supply operation, bias the REF pin to mid-supply using a precision reference such as REF192ESZ or a low-impedance op-amp buffer.
At a total supply of 36 V and 700 µA quiescent current, the AD8227BRZ dissipates approximately 25 mW without load, which is negligible in an 8-SOIC package. However, when driving a heavy load such as 10 kΩ to ground in a split-supply configuration, output stage dissipation depends on output voltage. The 8-SOIC thermal resistance is adequate for most instrumentation applications, but avoid driving low-impedance loads (<2 kΩ) at high ambient temperatures without checking the junction temperature.
Compliance Information
Compliance information was not explicitly stated in the verified web data. Confirm RoHS/REACH status on the distributor product page or Analog Devices official product page before volume production.
