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Analog Devices Inc. AD8505ARJZ-R7
- Part No.:
- AD8505ARJZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AD8505ARJZ-R7.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,174
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Product details
Overview
AD8505ARJZ-R7 from Analog Devices is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for ultra-low-power, precision sensing in battery-powered systems. It delivers 20 µA maximum supply current, 2.5 mV max offset voltage, 45 nV/√Hz voltage noise at 1 kHz, and 100 dB minimum PSRR - enabling stable signal conditioning across 1.8 V to 5 V supply range in pressure sensors and bio-sensing front-ends.
For engineers reviewing the AD8505ARJZ-R7 datasheet, AD8505ARJZ-R7 pinout, AD8505ARJZ-R7 application, or AD8505ARJZ-R7 equivalent, this page provides verified electrical specifications, SOT-23-5 package terminal mapping, zero-crossover distortion architecture details, and validated alternatives for low-voltage sensor signal chain design.
Technical Context
The AD8505ARJZ-R7 employs an on-chip charge pump to bias its input differential pair, eliminating crossover distortion across the full rail-to-rail common-mode input range (0 V to VSY). This architecture enables consistent CMRR ≥85 dB and PSRR ≥100 dB without performance degradation near supply rails.
It operates as a unity-gain-stable, low-noise amplifier with 95 kHz gain-bandwidth product, 13 mV/µs slew rate, and 60° phase margin into 1 MΩ//20 pF loads - supporting precision DC-coupled amplification and low-frequency filtering in energy-constrained applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 24 µA max per amplifier at −40°C to +125°C - enables >10-year battery life in coin-cell-powered sensors. |
| Input Offset Voltage | 2.5 mV max at 25°C; 3.5 mV max over −40°C to +125°C - supports <0.1% error in 3.3 V full-scale sensor outputs. |
| PSRR | 100 dB min (1.8 V–5 V supply range) - reduces battery voltage drift-induced errors to ≤14 µV input-referred. |
| CMRR | 105 dB typical at 25°C, 80 dB min over −40°C to +125°C - maintains accuracy in high-impedance bridge sensor interfaces. |
| Voltage Noise Density | 45 nV/√Hz at 1 kHz - preserves SNR in low-level bio-signal amplification (e.g., ECG, pulse oximetry). |
| Input Bias Current | 1 pA typical; 600 pA max over −40°C to +125°C - prevents leakage-induced errors in pH and ion-selective electrode circuits. |
| Rail-to-Rail I/O | Input range: 0 V to VSY; Output swing: within 2 mV of rails at 100 kΩ load - maximizes dynamic range in 1.8 V–5 V systems. |
Pinout & Package
AD8505ARJZ-R7 is housed in a 5-lead SOT-23 (RJ-5) package with exposed pad not connected internally. The device uses standard JEDEC MO-178AC footprint and supports reflow soldering per IPC/JEDEC J-STD-020.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output (OUT) | Amplified single-ended output node; drives loads down to 10 kΩ while maintaining rail-to-rail swing. |
| 2 | Negative Supply (V−) | Ground reference for single-supply operation; connects to system GND in 1.8 V–5 V configurations. |
| 3 | Noninverting Input (+IN) | High-impedance (220 GΩ) input accepting signals from 0 V to VSY without crossover distortion. |
| 4 | Inverting Input (−IN) | Differential input node; used with +IN to configure gain stages, filters, or transimpedance amplifiers. |
| 5 | Positive Supply (V+) | Power input for 1.8 V–5 V single supply or +0.9 V–+2.5 V dual supply; decoupling capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| Zero input crossover distortion | Enabled by internal charge pump - eliminates CMVR-dependent offset nonlinearity seen in dual-pair input op amps. |
| Ultra-low supply current | 24 µA max over full temperature range - allows continuous operation on CR2032 for >5 years in wake-on-event sensors. |
| High PSRR/CMRR synergy | 100 dB PSRR + 105 dB CMRR at 25°C - rejects both supply ripple and common-mode interference in unshielded PCB layouts. |
| Rail-to-rail input stage | Operates with VCM = 0 V to VSY - captures full output range of resistive sensors (e.g., strain gauges, thermistors) without level-shifting. |
| Low 1/f noise | 2.8 µV p-p (0.1 Hz–10 Hz) - critical for DC-stable amplification in smoke detector ion chambers and gas sensor baselines. |
Applications
| Pressure and Position Sensors | Bio Sensors |
|---|---|
|
Use Scenario: Amplifying mV-level output from MEMS pressure transducers in wearable health monitors. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with rail-to-rail input to capture full sensor span at 1.8 V supply. Use Value: 2.5 mV max VOS and 100 dB PSRR ensure <0.08% FS error over battery discharge from 3.3 V to 1.8 V. |
Use Scenario: Low-noise signal conditioning for dry-electrode ECG electrodes in portable diagnostics. IC Role / Device Role / Timing Role: First-stage amplifier with 1 pA typical IB to prevent polarization errors in high-impedance electrode interfaces. Use Value: 45 nV/√Hz noise density and 220 GΩ input resistance preserve microvolt-level cardiac signals without filtering loss. |
| IR Thermometers | Hazard Detectors |
|
Use Scenario: Amplifying thermopile output in contactless fever screening devices powered by AAA batteries. IC Role / Device Role / Timing Role: DC-coupled transimpedance amplifier converting nanoamp thermopile current to voltage. Use Value: 600 pA max IB over −40°C to +125°C avoids baseline drift in ambient temperature compensation algorithms. |
Use Scenario: Signal conditioning in photoelectric smoke detectors with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Ultra-low-quiescent amplifier for optical chamber current-to-voltage conversion during standby. Use Value: 24 µA max ISY enables >2-year battery life in UL-listed residential smoke alarms meeting NFPA 72 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision, low-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4505-1ARMZ | Same zero-crossover architecture; 15 µA typ supply current; 1.5 mV max VOS; MSOP-8 package only. | Lower offset enables higher-accuracy bridge measurements; larger footprint limits space-constrained wearables. | Select ADA4505-1ARMZ when VOS < 1.5 mV is required and board area permits MSOP-8. |
| LPV821DBVR | 220 fA max IB at 25°C; 350 nA supply current; no charge pump - exhibits crossover distortion near rails. | Better for femtoamp biosensors; unsuitable for rail-to-rail input linearity-critical applications like thermocouples. | Select LPV821DBVR only for ultra-high-Z current measurement where input linearity is secondary to bias current. |
Compared with ADA4505-1ARMZ, AD8505ARJZ-R7 offers smaller SOT-23-5 footprint and higher PSRR (100 dB vs. 95 dB), but slightly higher offset; compared with LPV821DBVR, it delivers true rail-to-rail linearity and 70× lower supply current, at the cost of higher input bias current.
Availability
AD8505ARJZ-R7 is available at Aetrix Electronics and suitable for pressure sensors, bio-sensing front-ends, and hazard detection systems requiring stable component supply across automotive, industrial, and medical OEM programs.
Supply support for AD8505ARJZ-R7 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 AD8505ARJZ-R7 belongs to Analog Devices' zero-crossover distortion op amp family, designed specifically for precision, low-voltage sensor signal chains in battery-operated medical, environmental, and safety-critical equipment.
FAQ
What supply voltage range does the AD8505ARJZ-R7 support?
The AD8505ARJZ-R7 operates from a single 1.8 V to 5 V supply or dual ±0.9 V to ±2.5 V supplies. Its rail-to-rail input/output architecture functions across the full range, with verified performance down to 1.8 V - making AD8505ARJZ-R7 ideal for direct connection to lithium coin cells and low-dropout regulator outputs in portable instrumentation.
Does the AD8505ARJZ-R7 require external components for zero-crossover operation?
No. The AD8505ARJZ-R7 integrates an on-chip charge pump that generates an internal boosted voltage to bias the input stage, eliminating crossover distortion without external capacitors or layout constraints. This internal solution ensures consistent 105 dB CMRR and rail-to-rail linearity in AD8505ARJZ-R7 without user intervention.
What is the maximum operating temperature for the AD8505ARJZ-R7?
The AD8505ARJZ-R7 is specified for operation from −40°C to +125°C, covering extended industrial and automotive under-hood environments. Electrical parameters including 24 µA max supply current and 3.5 mV max offset voltage are guaranteed across this full range - critical for AD8505ARJZ-R7 deployment in smoke detectors and engine-mounted sensors.
Can the AD8505ARJZ-R7 drive capacitive loads without instability?
Yes. The AD8505ARJZ-R7 is unity-gain stable and maintains 60° phase margin into 1 MΩ//20 pF loads. It exhibits controlled overshoot (<10%) up to 100 pF capacitive load with 100 kΩ series resistance - enabling direct interface to ADC input capacitors and long PCB traces in AD8505ARJZ-R7-based data acquisition modules.
Is the AD8505ARJZ-R7 pin-compatible with other op amps in the AD850x family?
No. The AD8505ARJZ-R7 uses a 5-lead SOT-23 package with unique pinout (OUT, V−, +IN, −IN, V+). AD8506 (dual) and AD8508 (quad) use different packages (MSOP-8, TSSOP-14) and pin assignments. Substituting AD8505ARJZ-R7 requires board-level redesign - confirming that AD8505ARJZ-R7 is a single-amplifier optimized solution, not part of a drop-in scalable family.
AD8505ARJZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.013V/µs
- Gain Bandwidth Product:
- 95 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 15µA
- Current - Output / Channel:
- 45 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AD8505ARJZ-R7 FAQ
1.How can I place an order for AD8505ARJZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8505ARJZ-R7 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 AD8505ARJZ-R7 reliable?
The price and inventory of AD8505ARJZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8505ARJZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8505ARJZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8505ARJZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8505ARJZ-R7?
AD8505ARJZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8505ARJZ-R7 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 AD8505ARJZ-R7?
For technical support, including AD8505ARJZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8505ARJZ-R7 requirements.
6.How does Aetrix verify that AD8505ARJZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8505ARJZ-R7 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 AD8505ARJZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8505ARJZ-R7?
All AD8505ARJZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8505ARJZ-R7, 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 AD8505ARJZ-R7 part is unused and in its original packaging.
Return procedure for AD8505ARJZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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