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Analog Devices Inc. AD621BNZ
- Part No.:
- AD621BNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD621BNZ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:103
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Product details
Overview
AD621BNZ from Analog Devices is a precision bipolar-input instrumentation amplifier optimized for low-drift, low-noise signal conditioning in bridge and transducer applications. It delivers pin-strappable gains of 10 or 100, 0.15% max total gain error, 5 ppm/°C gain drift, 125 µV max input offset voltage, and 9 nV/√Hz input voltage noise at 1 kHz - enabling high-accuracy weigh scales and industrial process control systems.
For engineers reviewing the AD621BNZ datasheet, AD621BNZ pinout, AD621BNZ application, or AD621BNZ equivalent, key selection criteria include guaranteed DC accuracy over temperature, programmable gain without external resistors, ±2.3 V to ±18 V dual-supply operation, and compatibility with high-impedance sensors requiring low input bias current (1.5 nA max) and high CMRR (110 dB min).
Technical Context
The AD621BNZ implements a modified three-op-amp architecture with on-chip laser-trimmed thin-film gain resistors, enabling factory-set gains of 10 (default) or 100 (via Pin 1–8 strap). Its Superβeta bipolar input stage achieves 1.5 nA max input bias current while maintaining 10² GΩ differential and common-mode input impedance.
Gain selection directly controls preamp transconductance: reducing RG for G = 100 increases open-loop gain and bandwidth (200 kHz), lowers input voltage noise (9 nV/√Hz), and improves gain-related error rejection - all without external components beyond the strap.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | Fixed 10 or 100 via Pin 1–8 strap; no external resistor required for standard gains |
| Total Gain Error | 0.15% max at ±10 V output - enables 12-bit system accuracy without calibration |
| Input Offset Voltage | 125 µV max (RTI, ±15 V supply) - supports sub-0.1% full-scale error in 20 mV bridge outputs |
| Gain Drift | 5 ppm/°C max - contributes ≤300 ppm error over –40°C to +85°C industrial range |
| Input Voltage Noise | 9 nV/√Hz @ 1 kHz - preserves SNR in low-level sensor signals (e.g., 10 µV p-p) |
| CMRR | 110 dB min (DC–60 Hz, 1 kΩ source imbalance) - rejects power-line interference in noisy plants |
| Supply Current | 1.3 mA max - enables battery-powered portable data loggers with multi-year runtime |
Pinout & Package
AD621BNZ is housed in an 8-lead plastic DIP (N-package) with 0.3-inch body width and through-hole mounting. Pin spacing follows standard 0.1-inch grid; leads are tin-lead plated for solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Gain Select (RG1) | Connect to Pin 8 to set gain = 100; open for gain = 10 |
| 2 | Inverting Input (–IN) | Differential input node; accepts signals referenced to REF or ground |
| 3 | Noninverting Input (+IN) | Differential input node; matched impedance to Pin 2 for CMR optimization |
| 4 | Negative Supply (–VS) | Connects to negative rail; supports operation down to –2.3 V |
| 5 | Reference Input (REF) | Output offset reference point; drives floating loads or injects precise DC offsets |
| 6 | Output (OUTPUT) | Single-ended, rail-to-rail capable output (±VS – 1.4 V swing @ ±18 V) |
| 7 | Positive Supply (+VS) | Connects to positive rail; supports operation up to +18 V |
| 8 | Gain Select (RG2) | Connect to Pin 1 to set gain = 100; open for gain = 10 |
Key Features
| Feature | Design Value |
|---|---|
| Pin-strappable gain | Zero-component switching between G = 10 and G = 100 maintains layout stability across product variants |
| Total system specification | All errors (gain, offset, drift, noise) guaranteed at device level - eliminates discrete error budgeting |
| Low input bias current | 1.5 nA max over –40°C to +85°C enables use with >100 kΩ source impedances (e.g., piezoresistive sensors) |
| High PSRR | 120 dB min supply rejection reduces sensitivity to noisy rails in industrial PLCs |
| Input overload protection | Withstands ±3 V continuous input overvoltage with power on/off - eliminates need for external clamps |
Applications
| Weigh Scales | Transducer Interface |
|---|---|
Use Scenario: Amplifying mV-level outputs from strain-gauge load cells in platform scales and hopper systems. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing fixed G = 100 gain with <125 µV offset to resolve 1 part in 16,000 full scale. Use Value: Eliminates manual zero calibration due to 0.6 µV/°C max offset drift and 5 ppm/°C gain drift over temperature. |
Use Scenario: Conditioning signals from pressure transducers (3 kΩ bridge) in HVAC and medical devices. IC Role / Device Role / Timing Role: Low-power (1.3 mA) signal conditioner operating from 5 V supplies with 0.28 µV p-p 0.1–10 Hz noise. Use Value: Enables battery-powered handheld gauges with >2-year life while maintaining diagnostic-grade blood pressure resolution. |
| Industrial Process Controls | Battery-Powered Equipment |
Use Scenario: Isolating and amplifying thermocouple or RTD signals in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: High-CMRR (110 dB) amplifier rejecting 60 Hz ground loops and motor drive noise in factory floors. Use Value: Maintains 14-bit effective resolution despite 10 V common-mode interference via REF pin offset cancellation. |
Use Scenario: Signal conditioning in portable multimeters and field data recorders. IC Role / Device Role / Timing Role: Dual-supply (±2.3 V min) instrumentation amp enabling single-cell Li-ion (3.0–4.2 V) operation with charge-pump rails. Use Value: Reduces BOM count by 7 parts vs. discrete 3-op-amp design while cutting supply current from 15 mA to 1.3 mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128P | FET-input architecture; higher input impedance (10¹² Ω) but 2× higher input bias current drift (10 pA/°C) and 50% wider gain error (0.25%) | Better for >1 GΩ source impedances (e.g., pH electrodes); less suitable for precision bridge apps requiring low TC | Select INA128P only when ultra-high Z inputs outweigh need for <5 ppm/°C gain drift |
| AD8421ARZ | Higher bandwidth (10 MHz @ G=10); lower noise (3.5 nV/√Hz); but requires external gain resistors and has no pin-strappable option | Preferred for high-speed DAQ; unsuitable for cost-sensitive designs where board space and assembly count matter | Choose AD8421ARZ when settling time <1 µs or noise <4 nV/√Hz is mandatory; otherwise AD621BNZ offers better integration |
Compared with INA128P and AD8421ARZ, the AD621BNZ uniquely combines factory-trimmed pin-strappable gain, guaranteed 5 ppm/°C drift, and 1.3 mA quiescent current in a DIP package - making it optimal for industrial weigh scales and portable transducer interfaces where calibration stability and power efficiency are primary.
Availability
AD621BNZ is available at Aetrix Electronics and suitable for weigh scales, transducer interface circuits, and industrial process controls requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD621BNZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD621BNZ belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for high-accuracy, low-power signal conditioning in industrial, medical, and test equipment where DC precision and thermal stability are critical.
FAQ
What gain options does the AD621BNZ support, and how are they configured?
The AD621BNZ supports two factory-trimmed gains: 10 (default) and 100. Gain is selected by strapping Pin 1 to Pin 8 with a wire or zero-ohm resistor - no external resistors or trimming required. This configuration ensures 5 ppm/°C max gain drift and 0.15% max gain error at both settings. The AD621BNZ does not support intermediate gains without degrading accuracy.
Can the AD621BNZ operate from a single supply?
No, the AD621BNZ requires dual supplies (±2.3 V to ±18 V) and is not specified for single-supply operation. Its input common-mode range extends to within 1.9 V of each rail, and output swing reaches within 1.4 V of each supply. For single-supply applications, consider the AD623 or AD8221, which are explicitly characterized for 3 V to 36 V single-rail operation.
What is the maximum continuous input overvoltage the AD621BNZ can withstand?
The AD621BNZ safely withstands ±3.0 V continuous differential input overvoltage with power applied or removed - verified per Analog Devices' absolute maximum ratings. This is enabled by internal 400 Ω thin-film input resistors and ESD diodes. External series resistors (e.g., 2 kΩ per input) extend protection to ±15 V but increase input noise to 15 nV/√Hz.
How does the REF pin function in the AD621BNZ, and what voltage range is allowed?
The REF pin sets the output's DC reference level. When grounded, output is centered at 0 V. Driving REF with a DAC or voltage source injects precise offsets (e.g., for zero suppression). REF accepts voltages from (–VS + 1.6 V) to (+VS – 1.6 V); exceeding this range risks output saturation. Input current into REF is ±60 µA, requiring low-impedance drive sources.
Is the AD621BNZ RoHS compliant and lead-free?
Yes, the AD621BNZ is RoHS compliant and features lead-free (Pb-free) terminations per Analog Devices' packaging standards. The "N" suffix denotes plastic DIP packaging with matte tin plating, fully compliant with JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and RoHS Directive 2011/65/EU. No exemptions apply.
AD621BNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1.2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 800 kHz
- Current - Input Bias:
- 500 pA
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 900µA
- Current - Output / Channel:
- 18 mA
- Voltage - Supply Span (Min):
- 4.6 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AD621BNZ FAQ
1.How can I place an order for AD621BNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD621BNZ 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 AD621BNZ reliable?
The price and inventory of AD621BNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD621BNZ is usually 5 days.
3.What payment methods are accepted for AD621BNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD621BNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD621BNZ?
AD621BNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD621BNZ 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 AD621BNZ?
For technical support, including AD621BNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD621BNZ requirements.
6.How does Aetrix verify that AD621BNZ is sourced from the original manufacturer or authorized distributors?
All AD621BNZ 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 AD621BNZ meets industry standards.
7.What is the process for return or replacement of AD621BNZ?
All AD621BNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD621BNZ, 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 AD621BNZ part is unused and in its original packaging.
Return procedure for AD621BNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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