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Analog Devices Inc. AD820BRZ
- Part No.:
- AD820BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD820BRZ.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,019
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Product details
Overview
AD820BRZ from Analog Devices is a precision, low-power, FET-input operational amplifier with true single-supply operation (5 V to 30 V), rail-to-rail output swing (within 10 mV of rails), and input voltage range extending 0.2 V below negative rail. It delivers 1.8 MHz unity-gain bandwidth, 3 V/μs slew rate, and 800 μA max quiescent current - enabling high-accuracy signal conditioning in battery-powered instrumentation and photodiode preamplifiers.
For engineers reviewing the AD820BRZ datasheet, AD820BRZ pinout, AD820BRZ application, or AD820BRZ equivalent, key selection considerations include its 25 pA max input bias current, 800 μV max input offset voltage, capacitive load drive up to 350 pF, and compatibility with industrial temperature range (−40°C to +85°C) in SOIC_N packaging.
Technical Context
The AD820BRZ employs an N-channel JFET input stage for ultra-low input bias current and high input impedance (10¹³ Ω || 2.8 pF common-mode), supporting precision DC coupling with source impedances up to 1 GΩ. Its bipolar rail-to-rail output stage achieves 5 mV VOL–VEE and 10 mV VCC–VOH at light loads, with output saturation resistance ~40 Ω (source) and ~20 Ω (sink).
It operates across dual supplies (±2.5 V to ±15 V) or single supply (5 V to 30 V), with CMRR ≥66 dB over temperature and PSRR ≥70 dB. Input common-mode range extends to −0.2 V below −VS and up to (V+) −1 V, avoiding phase reversal up to +VS - critical for single-supply sensor interfaces and active filters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | Single: 5 V to 30 V; Dual: ±2.5 V to ±15 V - supports wide input power flexibility without external level-shifting. |
| Input Bias Current | Max 25 pA at 25°C - enables high-impedance sensor interfacing (e.g., photodiodes, pH electrodes) with minimal DC error. |
| Input Offset Voltage | Max 0.8 mV (AD820B grade) - ensures ≤0.02% gain error in 12-bit to 14-bit data acquisition systems. |
| Unity-Gain Bandwidth | 1.8 MHz - sufficient for anti-aliasing filters, medical front-ends, and low-frequency active filter designs. |
| Slew Rate | 3 V/μs - supports clean 10 kHz sine wave amplification with <−93 dB THD into 10 kΩ load. |
| Capacitive Load Drive | Up to 350 pF - allows direct connection to ADC input capacitors or long PCB traces without instability. |
| Quiescent Current | Max 800 μA - enables multi-channel, battery-operated instrumentation with >1-year runtime on coin cells. |
Pinout & Package
AD820BRZ is supplied in an 8-lead SOIC_N (Small Outline Integrated Circuit, narrow body) package, measuring 4.9 mm × 3.9 mm × 1.75 mm, with standard 1.27 mm pitch and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect (NC) | Internally unconnected; must be left floating or tied to ground per layout best practice. |
| 2 | Inverting Input (–IN) | Differential input node; high-impedance JFET gate - sensitive to leakage paths and EMI pickup. |
| 3 | Non-Inverting Input (+IN) | Differential input node; identical impedance and noise performance as –IN; requires matched trace routing. |
| 4 | Negative Supply (–VS) | Ground reference for single-supply operation or negative rail for dual-supply; decoupling capacitor required. |
| 5 | No Connect (NC) | Internally unconnected; no electrical function - avoid routing signals or vias beneath this pad. |
| 6 | Output (VOUT) | Rail-to-rail output capable of sourcing/sinking 15 mA; drives capacitive loads up to 350 pF directly. |
| 7 | Positive Supply (+VS) | Main power input; accepts 5–30 V single or ±2.5–±15 V dual; requires local 0.1 μF ceramic decoupling. |
| 8 | No Connect (NC) | Internally unconnected; electrically isolated - may be used as thermal pad anchor if grounded externally. |
Key Features
| Feature | Design Value |
|---|---|
| True single-supply operation | Operates from 5 V to 30 V with input range extending 0.2 V below ground - eliminates need for split supplies in portable systems. |
| Rail-to-rail output swing | Swings within 10 mV of both supply rails at light loads - maximizes dynamic range in 3.3 V or 5 V microcontroller-based systems. |
| FET input stage | 25 pA max input bias current and 13 nV/√Hz input voltage noise - preserves signal integrity in high-Z sensor front-ends. |
| Capacitive load tolerance | Stable with up to 350 pF direct capacitive load - removes need for isolation resistors when driving SAR ADC inputs. |
| Industrial temperature range | Specified from −40°C to +85°C - suitable for medical devices, industrial sensors, and outdoor instrumentation without derating. |
Applications
| Photodiode Preamp | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: Amplifying low-level current from reverse-biased photodiodes in optical smoke detectors or pulse oximeters. IC Role / Device Role / Timing Role: Transimpedance amplifier with FET input preserving femtoamp-level signal fidelity and minimizing dark current error. Use Value: 25 pA max input bias current prevents signal corruption; rail-to-rail output maximizes ADC utilization in 3.3 V systems. |
Use Scenario: Signal conditioning and sensor interfacing in handheld multimeters or portable gas analyzers. IC Role / Device Role / Timing Role: Precision buffer and gain stage for thermocouple, RTD, or bridge sensor outputs. Use Value: 800 μA quiescent current enables multi-channel operation on coin-cell batteries; 0.8 mV offset ensures 12-bit accuracy without calibration. |
| Active Filters | Medical Instrumentation |
|
Use Scenario: Implementing 3-pole Sallen-Key low-pass filters in ECG front-ends or audio anti-aliasing stages. IC Role / Device Role / Timing Role: Unity-gain stable op amp providing accurate pole placement and low distortion. Use Value: 1.8 MHz GBW and −93 dB THD at 10 kHz ensure filter response integrity; 350 pF load drive avoids external isolation components. |
Use Scenario: Front-end amplification in portable EEG or EMG systems requiring low noise and DC stability. IC Role / Device Role / Timing Role: Low-noise, low-drift amplifier for biopotential signal acquisition with high common-mode rejection. Use Value: 2 μV/°C offset drift minimizes baseline wander; 66 dB min CMRR suppresses 50/60 Hz interference in unshielded environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC2272CDR | Higher quiescent current (1.1 mA), lower GBW (2.2 MHz), but rail-to-rail input/output and lower cost. | Less suitable for ultra-low-power battery systems; better for higher-speed, cost-sensitive industrial controls. | Select TLC2272CDR when supply current budget allows >1 mA and input rail-to-rail capability is required. |
| OPA344UA | Lower input bias current (0.2 pA), but narrower supply range (2.7–5.5 V), lower output drive (8 mA), and no −40°C rating. | Optimized for 3.3 V portable electronics only; not rated for extended industrial temperature operation. | Choose OPA344UA only for 3.3 V, room-temperature consumer applications where femtoamp bias is critical. |
Compared with TLC2272CDR and OPA344UA, AD820BRZ uniquely balances ultra-low input bias (25 pA), wide supply range (5–30 V), industrial temperature rating, and 350 pF capacitive load drive - making it the only option among the three qualified for battery-powered medical and industrial instrumentation across full temperature range.
Availability
AD820BRZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode preamplifiers, and active filter designs requiring stable component supply, long-term lifecycle support, and guaranteed industrial-grade performance.
Supply support for AD820BRZ 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 AD820 belongs to Analog Devices' precision op amp product line, engineered for low-power, high-accuracy signal conditioning in single-supply environments - especially targeting portable test equipment, medical sensors, and industrial process monitoring.
FAQ
What supply voltage range does the AD820BRZ support?
The AD820BRZ supports single-supply operation from 5 V to 30 V and dual-supply operation from ±2.5 V to ±15 V. This wide range allows direct integration into legacy 24 V industrial systems, modern 5 V/3.3 V embedded platforms, and battery-powered devices using two to four alkaline cells - all without external level-shifting circuitry. The AD820BRZ maintains full specification compliance across this entire range.
Does the AD820BRZ have rail-to-rail input capability?
No, the AD820BRZ does not feature rail-to-rail input. Its input common-mode voltage range extends from 0.2 V below the negative supply rail to 1 V below the positive supply rail. While it accepts inputs below ground in single-supply mode - a key advantage for sensor interfacing - it cannot handle voltages near the positive rail without bandwidth reduction or increased common-mode error, as documented in Figure 20 of the datasheet.
What is the maximum capacitive load the AD820BRZ can drive stably?
The AD820BRZ is characterized to drive up to 350 pF of capacitive load directly without requiring external isolation resistors. This capability is verified across temperature and supply conditions, enabling direct connection to sampling capacitors in SAR ADCs, LCD bias networks, or long PCB traces - eliminating phase margin degradation and oscillation risk seen in many general-purpose op amps.
How does the AD820BRZ perform in terms of input offset voltage and drift?
The AD820BRZ (B-grade) specifies a maximum input offset voltage of 0.8 mV at 25°C and 0.9 mV over the full −40°C to +85°C range. Its typical offset voltage drift is 2 μV/°C, ensuring predictable, low-drift behavior in precision DC-coupled applications such as strain gauge amplifiers or reference buffers - critical for maintaining accuracy without periodic recalibration.
Is the AD820BRZ pin-compatible with other op amps in the same package?
The AD820BRZ uses the industry-standard 8-lead SOIC_N footprint (1.27 mm pitch), but it is not pin-compatible with generic SOIC op amps due to its NC pins (1, 5, 8) and specific internal topology. Substitution requires verification of pin function mapping, especially the absence of shutdown, compensation, or reference pins found in alternatives - always consult the AD820BRZ pinout diagram before board-level replacement.
AD820BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- 1.9 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 pA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 700µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD820BRZ FAQ
1.How can I place an order for AD820BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD820BRZ 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 AD820BRZ reliable?
The price and inventory of AD820BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD820BRZ is usually 5 days.
3.What payment methods are accepted for AD820BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD820BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD820BRZ?
AD820BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD820BRZ 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 AD820BRZ?
For technical support, including AD820BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD820BRZ requirements.
6.How does Aetrix verify that AD820BRZ is sourced from the original manufacturer or authorized distributors?
All AD820BRZ 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 AD820BRZ meets industry standards.
7.What is the process for return or replacement of AD820BRZ?
All AD820BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD820BRZ, 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 AD820BRZ part is unused and in its original packaging.
Return procedure for AD820BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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