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Analog Devices Inc. AD627BNZ
- Part No.:
- AD627BNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD627BNZ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,496
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Product details
Overview
AD627BNZ from Analog Devices is a micropower, rail-to-rail output instrumentation amplifier optimized for low-power precision signal conditioning in single- and dual-supply systems. It delivers 85 μA max supply current, ±18 V / +36 V wide supply range, 80 kHz bandwidth at G = +5, 83 dB min CMRR (G = +5), and 125 μV max input offset voltage - enabling high-accuracy sensor interfacing in battery-powered medical and industrial equipment.
For engineers reviewing the AD627BNZ datasheet, AD627BNZ pinout, AD627BNZ application, or AD627BNZ equivalent, this page provides verified specifications, validated pin functions, confirmed alternative parts with documented technical differences, and real-world use cases including thermocouple amplification, 4–20 mA loop receivers, and portable ECG front-ends.
Technical Context
The AD627BNZ implements a modified current-feedback architecture with interstage feedforward compensation to maintain high CMRR (>83 dB up to 200 Hz) while operating at micropower levels. Its dual-loop internal topology achieves factory-trimmed gain accuracy of 0.01% and enables rail-to-rail output swing across ±1.1 V to ±18 V or +2.2 V to +36 V supplies.
Gain is set externally via a single resistor (RG) between Pins 1 and 8, supporting 5 to 1000 V/V range per Gain = 5 + (200 kΩ/RG). Input impedance exceeds 20 GΩ || 2 pF differential and common-mode, with 10 nA max input bias current and 38 nV/√Hz RTI voltage noise at 1 kHz (G = +100).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 85 μA maximum - enables multi-year operation on coin-cell batteries in portable instruments. |
| Gain Range | 5 to 1000 V/V - set by single external resistor (RG), no trimming required for standard gains. |
| Input Offset Voltage | 125 μV maximum (AD627B grade) - minimizes DC error in low-level transducer signals like thermocouples. |
| CMRR | 83 dB minimum at G = +5, DC–60 Hz - rejects 50/60 Hz line noise without external filtering. |
| Bandwidth | 80 kHz at G = +5 - supports fast-sampling data acquisition up to ~10 kSPS with <0.1% settling. |
| Output Swing | Rail-to-rail: within 25 mV of rails (RL = 20 kΩ) - maximizes dynamic range in low-voltage single-supply systems. |
| PSRR | 125 dB at G = +1000 - suppresses supply ripple in noisy industrial environments. |
Pinout & Package
AD627BNZ is housed in an 8-lead PDIP (Plastic Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch; lead finish is matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 RG | External gain-setting resistor connection | Resistor placed between Pins 1 and 8 sets gain per Gain = 5 + (200 kΩ/RG); open-circuit yields G = +5. |
| 2 −IN | Inverting input terminal | Accepts negative leg of differential sensor signal; input voltage range extends to (−VS) − 0.1 V. |
| 3 +IN | Noninverting input terminal | Accepts positive leg of differential sensor signal; common-mode range supports rail-to-rail inputs. |
| 4 −VS | Negative supply rail | Connects to ground (single supply) or negative rail (dual supply); absolute max rating ±18 V. |
| 5 REF | Reference voltage input | Sets output zero point; drives virtual ground for bipolar signal amplification or level-shifting. |
| 6 OUTPUT | Amplified output voltage | Delivers rail-to-rail swing referenced to REF; capable of ±25 mA short-circuit current. |
| 7 +VS | Positive supply rail | Accepts +2.2 V to +36 V (single) or ±1.1 V to ±18 V (dual); decoupling capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 85 μA max quiescent current - reduces thermal drift and extends battery life in portable ECG/EEG devices. |
| Rail-to-rail output stage | Swings within 25 mV of supply rails (RL = 20 kΩ) - preserves full ADC input range in 3.3 V or 5 V systems. |
| Single-resistor gain programming | One external resistor (RG) sets gain from 5 to 1000 - eliminates complex feedback networks and layout sensitivity. |
| High DC accuracy | 125 μV max input offset (AD627B), 10 ppm/°C gain drift - ensures stable calibration over temperature in process controls. |
| Superior AC CMRR | 83 dB min at 60 Hz with 1 kΩ source imbalance - rejects mains interference in industrial sensor nodes without guard traces. |
Applications
| Thermocouple Amplifier | 4–20 mA Loop Receiver |
|---|---|
|
Use Scenario: Amplifying microvolt-level thermocouple outputs (e.g., Type K, −5 mV to +60 mV) in HVAC or furnace controllers. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing cold-junction compensation interface and programmable gain. Use Value: 125 μV max input offset and 83 dB CMRR minimize thermal EMF errors and line-noise corruption at 60 Hz. |
Use Scenario: Converting 4–20 mA loop current to 0.5–2.5 V analog signal for microcontroller ADC in PLC I/O modules. IC Role / Device Role / Timing Role: Low-power, rail-to-rail output amplifier with reference input for precise current-to-voltage conversion. Use Value: Single-supply operation down to +2.2 V and 85 μA supply current enable direct integration into loop-powered field devices. |
| Portable ECG Front-End | Low-Power Data Acquisition |
|
Use Scenario: Conditioning biopotential signals (0.5–5 mV, <100 Hz) in handheld ECG monitors powered by CR2032 batteries. IC Role / Device Role / Timing Role: Micropower instrumentation amplifier with high input impedance and low noise for biopotential sensing. Use Value: 38 nV/√Hz input-referred noise at 1 kHz and 20 GΩ || 2 pF input impedance preserve SNR in high-impedance electrode interfaces. |
Use Scenario: Signal conditioning for 12-bit+ SAR ADCs in battery-operated environmental sensors (temperature, pressure, humidity). IC Role / Device Role / Timing Role: Precision gain block with programmable scaling and rail-to-rail output compatible with low-voltage ADC references. Use Value: 80 kHz bandwidth at G = +5 supports >10 kSPS sampling; 0.01% factory-trimmed gain accuracy reduces system calibration overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8221ARMZ | Higher supply current (350 μA), wider bandwidth (850 kHz at G = +10), lower input offset (25 μV max), SOIC-8 package only. | Better for high-speed, high-accuracy applications (e.g., strain-gauge bridges at >1 kHz), but unsuitable for ultra-low-power designs. | Select AD8221ARMZ when bandwidth >100 kHz and offset <50 μV are required; AD627BNZ remains optimal for sub-100 μA power budgets. |
| INA333AIDR | Zerø-drift architecture, 25 μV max offset, 50 μA supply current, but limited supply range (+1.8 V to +5.5 V), SOIC-8 only. | Ideal for low-voltage, high-precision applications (e.g., wearable biosensors), but cannot support ±15 V or 24 V loop systems. | Choose INA333AIDR for sub-2 V single-supply systems requiring <1 μV/°C drift; AD627BNZ is preferred for wide-supply industrial use. |
Compared with AD8221ARMZ and INA333AIDR, AD627BNZ uniquely balances micropower operation (85 μA), wide supply range (±18 V / +36 V), and rail-to-rail output - making it the only option among the three suitable for both battery-powered portables and 24 V industrial loop receivers without design compromise.
Availability
AD627BNZ is available at Aetrix Electronics and suitable for thermocouple amplification, 4–20 mA loop receivers, and portable ECG front-ends requiring stable component supply across extended production lifecycles.
Supply support for AD627BNZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD627 belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-power, high-accuracy sensor signal conditioning in medical, industrial, and portable measurement systems.
FAQ
What is the maximum gain achievable with AD627BNZ, and how is it set?
The AD627BNZ supports a gain range of 5 to 1000 V/V, set by a single external resistor (RG) connected between Pins 1 and 8. The relationship is defined as Gain = 5 + (200 kΩ/RG). For example, a 205 Ω resistor yields G ≈ 980. When RG is omitted, the AD627BNZ defaults to G = +5. This resistor-programmable architecture eliminates complex feedback networks and maintains high CMRR across the full gain range.
Does AD627BNZ support true rail-to-rail input common-mode voltage?
No - the AD627BNZ features rail-to-rail *output* swing but not rail-to-rail *input* common-mode range. Its input common-mode voltage range is specified as (−VS) − 0.1 V to (+VS) − 1 V. For example, with +5 V single supply, the usable input common-mode range is −0.1 V to +4.0 V. This limitation must be considered when interfacing with sensors whose output swings near the positive rail.
Can AD627BNZ operate from a single 3.3 V supply?
Yes - the AD627BNZ is fully specified for single-supply operation from +2.2 V to +36 V. At +3.3 V, it delivers rail-to-rail output swing (within 25 mV of rails), 85 μA max supply current, and maintains 83 dB CMRR at 60 Hz. Its input common-mode range becomes −0.1 V to +2.3 V, making it suitable for interfacing with 3.3 V-compatible sensors and microcontrollers.
What is the function of the REF pin on AD627BNZ?
The REF pin on AD627BNZ defines the output voltage reference point: VOUT = (V+IN − V−IN) × Gain + VREF. It enables level-shifting of the output without affecting gain or common-mode rejection. Driving REF with a low-impedance source (e.g., DAC output or precision voltage divider) allows bipolar signal amplification, ground isolation in loop-powered systems, or offset correction - critical in 4–20 mA receiver and thermocouple applications.
How does AD627BNZ compare to AD627ANZ in terms of performance?
The AD627BNZ (B-grade) offers tighter DC specifications than the AD627ANZ (A-grade): 125 μV vs. 200 μV max input offset voltage, 1 μV/°C vs. 3 μV/°C max offset drift, and 83 dB vs. 77 dB min CMRR at G = +5. Both share identical pinout, package (PDIP-8), supply range, bandwidth, and noise performance. The B-grade is recommended for higher-accuracy applications such as medical instrumentation and precision industrial sensors.
AD627BNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.06V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 80 kHz
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 60µA
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AD627BNZ FAQ
1.How can I place an order for AD627BNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD627BNZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD627BNZ reliable?
The price and inventory of AD627BNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD627BNZ is usually 5 days.
3.What payment methods are accepted for AD627BNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD627BNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD627BNZ?
AD627BNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD627BNZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD627BNZ?
For technical support, including AD627BNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD627BNZ requirements.
6.How does Aetrix verify that AD627BNZ is sourced from the original manufacturer or authorized distributors?
All AD627BNZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD627BNZ meets industry standards.
7.What is the process for return or replacement of AD627BNZ?
All AD627BNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD627BNZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD627BNZ part is unused and in its original packaging.
Return procedure for AD627BNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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