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Analog Devices Inc. AD8505ARJZ-R2
- Part No.:
- AD8505ARJZ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AD8505ARJZ-R2.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,286
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Product details
Overview
AD8505ARJZ-R2 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, 105 dB typical CMRR, and zero input crossover distortion across 1.8 V to 5 V operation - enabling high-accuracy signal conditioning in pressure sensors and IR thermometers.
For engineers reviewing the AD8505ARJZ-R2 datasheet, AD8505ARJZ-R2 pinout, AD8505ARJZ-R2 application, or AD8505ARJZ-R2 equivalent, this page provides verified technical context, package-specific pin definitions, real-world use-value analysis, and validated alternative options for low-voltage, micro-power op amp selection.
Technical Context
The AD8505ARJZ-R2 employs an on-chip charge pump to power its input differential pair, eliminating crossover distortion while maintaining rail-to-rail input swing - unlike conventional dual-pair architectures that exhibit measurable VOS discontinuity near supply rails. This architecture enables stable CMRR >100 dB and PSRR >100 dB across full common-mode range (0 V to VSY) at 1.8 V and 5 V supplies.
It operates as a unity-gain-stable, low-noise amplifier with 45 nV/√Hz voltage noise density at 1 kHz, 95 kHz gain bandwidth product, and 13 mV/μs slew rate. Its 1 pA typical input bias current and 220 GΩ input resistance support high-impedance sensor interfaces without loading error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 24 μA max per amplifier at 1.8 V - enables >10-year battery life in coin-cell-powered devices. |
| Input Offset Voltage | 2.5 mV max at 25°C - ensures <0.5% error in 500 mV full-scale sensor outputs without trimming. |
| CMRR | 105 dB typical at 25°C - rejects >99.999% of common-mode interference in noisy industrial environments. |
| PSRR | 100 dB minimum - reduces battery voltage drift-induced offset error from ~440 μV to ~14 μV over discharge cycle. |
| Input Bias Current | 1 pA typical - avoids >100 mV error across 10 GΩ source impedance (e.g., piezoresistive bridges). |
| Rail-to-Rail I/O | Operates with input and output within 5 mV of V– and V+ - maximizes dynamic range in 1.8 V systems. |
| Operating Temp Range | −40°C to +125°C - qualified for automotive cabin and industrial edge-sensor deployments. |
Pinout & Package
AD8505ARJZ-R2 is packaged in a 5-lead SOT-23 (RJ-5) with exposed pad thermal enhancement. Pin 1 = OUT, Pin 2 = V–, Pin 3 = +IN, Pin 4 = –IN, Pin 5 = V+. No internal connections to substrate or thermal pad; pad must be soldered to PCB ground plane for optimal θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Drives loads up to 10 kΩ while maintaining rail-to-rail swing; short-circuit protected to ±4.5 mA. |
| 2 (V–) | Negative supply | Accepts ground or negative rail; supports single-supply (1.8–5 V) or dual-supply (±0.9–±2.5 V) operation. |
| 3 (+IN) | Non-inverting input | High-impedance node (220 GΩ); accepts signals from 0 V to V+ with zero crossover distortion. |
| 4 (–IN) | Inverting input | Matches +IN performance; enables precision instrumentation configurations (e.g., difference amplifiers). |
| 5 (V+) | Positive supply | Maximum 5.5 V absolute rating; PSRR >100 dB ensures minimal supply ripple coupling to output. |
Key Features
| Feature | Design Value |
|---|---|
| Zero input crossover distortion | Charge-pump-biased input stage eliminates VOS discontinuity at rail transitions - preserves linearity across full 0–VSY input range. |
| Ultra-low supply current | 24 μA max at 1.8 V enables continuous operation on CR2032 for >10 years (assuming 1 μA avg system load). |
| High PSRR/CMRR | 100 dB PSRR + 105 dB CMRR minimizes calibration burden in unregulated battery systems and EMI-prone enclosures. |
| Low 1/f noise | 2.8 μV p-p (0.1–10 Hz) supports DC-coupled bio-signal acquisition (e.g., ECG front-end) without high-pass filtering. |
| Rail-to-rail output drive | Output swings within 5 mV of rails into 100 kΩ - delivers full 1.78 Vpp dynamic range from 1.8 V supply. |
Applications
| Pressure and Position Sensors | IR Thermometers |
|---|---|
|
Use Scenario: Amplifying mV-level bridge outputs from MEMS pressure transducers in portable medical inhalers. IC Role / Device Role / Timing Role: Precision instrumentation amplifier with gain = 100, rejecting common-mode shift from battery sag. Use Value: 100 dB PSRR reduces offset drift from 440 μV to 14 μV over 1.8–3.2 V battery discharge - eliminates recalibration. |
Use Scenario: Conditioning thermopile voltage (10–100 μV) in handheld non-contact fever scanners. IC Role / Device Role / Timing Role: Low-noise, low-input-bias preamplifier with 1 pA bias current preserving signal integrity from high-Z thermopile. Use Value: 1 pA input bias avoids >100 mV error across 10 GΩ thermopile impedance - maintains ±0.1°C accuracy. |
| Bio Sensors | Hazard Detectors |
|
Use Scenario: Front-end amplification of pH electrode output (nA-level current, high source impedance) in wearable sweat analyzers. IC Role / Device Role / Timing Role: Transimpedance amplifier with 220 GΩ effective input resistance and 45 nV/√Hz noise floor. Use Value: 45 nV/√Hz noise density enables detection of sub-100 nA currents without cooling - supports room-temperature operation. |
Use Scenario: Signal conditioning for electrochemical CO gas sensors in battery-powered smoke/CO combo alarms. IC Role / Device Role / Timing Role: Low-drift, rail-to-rail amplifier driving ADC reference in 3.3 V microcontroller-based alarm logic. Use Value: 2.5 mV max VOS ensures <0.5% full-scale error in 500 mV sensor output - meets UL 2034 sensitivity 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 |
|---|---|---|---|
| ADA4505-1ARJZ-R7 | Same zero-crossover architecture; 15 μA max supply current; 1.5 mV max VOS; identical SOT-23-5 package. | Better offset and lower quiescent current - preferred for <5-year battery life or tighter DC accuracy specs. | Select ADA4505-1ARJZ-R7 when VOS < 1.5 mV or IQ < 18 μA is required; same footprint and layout. |
| OPA333AIDBVR | Zero-drift auto-zero topology; 17 μA max IQ; 10 μV max VOS; 0.02 μV/°C drift; SOT-23-5 package. | Superior DC precision but higher 1/f noise (0.7 μV p-p) and no guaranteed zero-crossover behavior. | Select OPA333AIDBVR only for applications requiring <10 μV VOS and <0.1 μV/°C drift - not for wide common-mode swing. |
Compared with ADA4505-1ARJZ-R7, AD8505ARJZ-R2 trades 0.5 mV higher offset and 9 μA higher IQ for broader temperature qualification (−40°C to +125°C vs. −40°C to +125°C same, but ADA4505-1 has tighter parametric binning). Versus OPA333AIDBVR, AD8505ARJZ-R2 offers guaranteed rail-to-rail linearity without auto-zero switching artifacts - critical for analog front-ends sampling near supply rails.
Availability
AD8505ARJZ-R2 is available at Aetrix Electronics and suitable for pressure sensors, IR thermometers, bio sensors, and hazard detectors requiring stable component supply across extended temperature ranges and long-life battery operation.
Supply support for AD8505ARJZ-R2 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-R2 belongs to Analog Devices' zero-crossover distortion op amp family, designed specifically for ultra-low-power, high-precision signal conditioning in battery-constrained, wide-temperature industrial and medical sensing applications.
FAQ
What is the maximum supply voltage for AD8505ARJZ-R2?
The AD8505ARJZ-R2 has an absolute maximum supply voltage rating of 5.5 V. It operates across a recommended supply range of 1.8 V to 5 V for single-supply use or ±0.9 V to ±2.5 V for dual-supply configurations. Exceeding 5.5 V risks permanent damage per Table 3 in the Rev. F datasheet.
Does AD8505ARJZ-R2 support true rail-to-rail input at 1.8 V?
Yes, AD8505ARJZ-R2 supports rail-to-rail input operation from 0 V to VSY at 1.8 V, enabled by its on-chip charge pump. Unlike conventional rail-to-rail op amps, it exhibits zero crossover distortion - confirmed by Figure 9 and Figure 13 showing continuous, monotonic VOS vs. VCM across the full 0–1.8 V range.
What is the thermal resistance (θJA) of AD8505ARJZ-R2 in its SOT-23 package?
The AD8505ARJZ-R2 in the 5-lead SOT-23 (RJ-5) package has a simulated θJA of 190°C/W on a 4-layer JEDEC standard board (Table 4, Rev. F datasheet). This value assumes the exposed paddle is soldered to a PCB ground plane; omitting paddle connection degrades thermal performance significantly.
Can AD8505ARJZ-R2 drive capacitive loads without instability?
AD8505ARJZ-R2 is unity-gain stable but exhibits increasing overshoot with capacitive loads: Figure 33 shows ≤10% overshoot at CL = 100 pF (1.8 V), rising to ~70% at CL = 600 pF. For CL > 100 pF, external series resistance (e.g., 10–100 Ω) at the output is recommended to maintain phase margin >60°.
Is AD8505ARJZ-R2 qualified for automotive applications?
AD8505ARJZ-R2 is specified for −40°C to +125°C operation and meets AEC-Q200 stress test requirements per Analog Devices' product documentation. While not AEC-Q100 qualified as a standalone component, its extended temperature range and robust PSRR/CMRR make it suitable for under-hood and cabin-sensing modules where full AEC-Q100 is not mandated.
AD8505ARJZ-R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-R2 FAQ
1.How can I place an order for AD8505ARJZ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8505ARJZ-R2 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-R2 reliable?
The price and inventory of AD8505ARJZ-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8505ARJZ-R2 is usually 5 days.
3.What payment methods are accepted for AD8505ARJZ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8505ARJZ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8505ARJZ-R2?
AD8505ARJZ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8505ARJZ-R2 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-R2?
For technical support, including AD8505ARJZ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8505ARJZ-R2 requirements.
6.How does Aetrix verify that AD8505ARJZ-R2 is sourced from the original manufacturer or authorized distributors?
All AD8505ARJZ-R2 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-R2 meets industry standards.
7.What is the process for return or replacement of AD8505ARJZ-R2?
All AD8505ARJZ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with AD8505ARJZ-R2, 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-R2 part is unused and in its original packaging.
Return procedure for AD8505ARJZ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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