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Analog Devices Inc. AD8508ARUZ
- Part No.:
- AD8508ARUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD8508ARUZ.pdf
- Description:
- IC CMOS 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:615
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Product details
Overview
AD8508ARUZ from Analog Devices is a quad, rail-to-rail input/output, micro-power operational amplifier optimized for ultra-low supply current (≤20 µA per amplifier), zero input crossover distortion, and high precision in battery-powered sensor signal conditioning. It operates from 1.8 V to 5 V single supply or ±0.9 V to ±2.5 V dual supply, features 2.5 mV max offset voltage, 105 dB typical CMRR, and 45 nV/√Hz voltage noise density at 1 kHz - enabling accurate front-end amplification in IR thermometers and hazard detectors.
For engineers reviewing the AD8508ARUZ datasheet, AD8508ARUZ pinout, AD8508ARUZ application, or AD8508ARUZ equivalent, this page delivers verified specifications, TSSOP-14 package layout, real-world use cases in remote sensing and patient monitoring, and two validated alternative op amps with documented functional trade-offs.
Technical Context
The AD8508ARUZ employs an on-chip charge pump to power its input differential pair, eliminating crossover distortion across the full rail-to-rail common-mode range (0 V to VSY). This architecture enables stable 105 dB CMRR and 100 dB PSRR even at 1.8 V supply, unlike conventional dual-pair rail-to-rail input op amps that exhibit offset voltage discontinuities near supply rails.
It delivers unity-gain stability with 95 kHz gain bandwidth product, 13 mV/µs slew rate, and 60° phase margin into 1 MΩ//20 pF loads. Input bias current remains ≤10 pA (typ) across −40°C to +125°C, supporting high-impedance bio-sensor and pressure transducer interfaces without significant leakage error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 20 µA per amplifier max - enables >10-year battery life in coin-cell–powered smoke detectors. |
| Input Offset Voltage | 2.5 mV max - ensures <±0.5% gain error in 12-bit ADC front ends with 2.5 V reference. |
| CMRR | 105 dB typical - rejects >99.999% of common-mode noise from EMI-prone industrial sensor cables. |
| Rail-to-Rail I/O | Input range: 0 V to VSY; Output swing: within 5 mV of rails at 100 kΩ load - maximizes dynamic range in low-voltage systems. |
| Voltage Noise Density | 45 nV/√Hz at 1 kHz - supports sub-µV signal resolution in IR thermometer preamps without excessive filtering. |
| Operating Temp Range | −40°C to +125°C - qualified for under-hood automotive sensors and industrial process monitors. |
| Gain Bandwidth Product | 95 kHz - sufficient for DC–10 kHz sensor signal conditioning with stable closed-loop response. |
Pinout & Package
AD8508ARUZ is housed in a 14-lead TSSOP (RU-14) package with exposed pad for thermal enhancement. Pin numbering follows standard JEDEC outline; pin 1 is marked by a dot or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives low-impedance loads up to ±45 mA short-circuit current. |
| 2 | –IN A | Inverting input of Amp A - high-impedance node (220 GΩ) for precision feedback networks. |
| 3 | +IN A | Non-inverting input of Amp A - accepts rail-to-rail common-mode signals without distortion. |
| 4 | V+ | Positive supply rail - accepts 1.8 V to 5 V single supply or connects to +VSY in dual-supply mode. |
| 5 | +IN B | Non-inverting input of Amp B - electrically isolated from other channels; supports independent sensor inputs. |
| 6 | –IN B | Inverting input of Amp B - matched input capacitance (3 pF diff, 4.2 pF common-mode) minimizes phase mismatch. |
| 7 | OUT B | Amplifier B output - identical drive capability and rail-to-rail swing as OUT A. |
| 8 | V– | Negative supply rail - connects to GND in single-supply mode or −VSY in dual-supply configuration. |
| 9 | OUT C | Amplifier C output - enables 3-channel simultaneous acquisition (e.g., 3-axis accelerometer interface). |
| 10 | –IN C | Inverting input of Amp C - low 1 pA typical bias current preserves accuracy in high-Z pH electrode buffers. |
| 11 | +IN C | Non-inverting input of Amp C - same rail-to-rail performance and charge-pump–enabled distortion-free operation. |
| 12 | +IN D | Non-inverting input of Amp D - supports fourth independent sensor channel with identical specs. |
| 13 | –IN D | Inverting input of Amp D - matched to other inputs for consistent channel-to-channel timing and gain. |
| 14 | OUT D | Amplifier D output - completes quad-channel functionality for multi-parameter medical or environmental monitors. |
Key Features
| Feature | Design Value |
|---|---|
| Zero input crossover distortion | Charge-pump–biased input stage eliminates offset voltage discontinuity across 0 V to VSY, enabling true rail-to-rail linear operation. |
| Ultra-low quiescent current | 20 µA per amplifier maximum allows four-channel operation at <80 µA total - critical for CR2032-powered portable devices. |
| High PSRR/CMRR | 100 dB min PSRR and 105 dB typ CMRR maintain signal integrity in noisy battery-powered environments with varying supply voltage. |
| Low input bias current | 1 pA typical (−40°C to +85°C) prevents voltage drop across >100 MΩ sensor elements like piezoresistive pressure bridges. |
| Wide supply range | 1.8 V to 5 V single supply accommodates aging alkaline, Li-ion, or coin-cell batteries without external regulation. |
Applications
| Pressure and Position Sensors | Bio Sensors |
|---|---|
|
Use Scenario: Amplifying mV-level outputs from MEMS pressure transducers in wearable health monitors. IC Role / Device Role / Timing Role: Quad-channel instrumentation amplifier front end with matched gain paths for differential bridge sensing. Use Value: 2.5 mV max offset and 45 nV/√Hz noise enable <1 mmHg pressure resolution without calibration drift over battery discharge. |
Use Scenario: Signal conditioning for disposable glucose test strips requiring ultra-low power and high input impedance. IC Role / Device Role / Timing Role: Transimpedance amplifier for amperometric current measurement with rail-to-rail input compliance. Use Value: 1 pA typical input bias current avoids loading of enzymatic reaction currents; 20 µA/quadrant extends strip-reader battery life to >500 tests. |
| IR Thermometers | Hazard Detectors |
|
Use Scenario: Amplifying thermopile output in non-contact temperature sensors used in industrial safety equipment. IC Role / Device Role / Timing Role: Low-noise, DC-coupled preamplifier with gain stabilization across −40°C to +125°C ambient range. Use Value: 2.5 µV/°C max offset drift and 105 dB CMRR reject thermal EMF errors from PCB copper traces during rapid ambient changes. |
Use Scenario: Signal chain for photoelectric smoke detectors powered by 9 V alkaline batteries with 5+ year shelf life. IC Role / Device Role / Timing Role: Low-power comparator driver and analog front end for particle-scattering photodiode signals. Use Value: 20 µA per amplifier enables continuous sampling at 1 Hz while preserving >90% battery capacity after 3 years of standby operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad micropower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4505-4ARUZ | Same 14-lead TSSOP package; 15 µA per amplifier typical supply current; 1.5 mV max offset voltage; 100 kHz GBP. | Better offset and noise specs, but higher cost and slightly reduced PSRR (95 dB min) - preferred for high-accuracy medical diagnostics. | Select ADA4505-4ARUZ when <1.5 mV offset and <35 nV/√Hz noise are required, accepting minor PSRR trade-off. |
| LPV821QDGKR | Single-channel, 8-pin VSSOP; 650 nA per amplifier; 1.25 mV max offset; 10 kHz GBP; no charge pump - exhibits crossover distortion. | Lower power but limited bandwidth and rail-to-rail linearity - suitable only for slow, low-precision sensor buffering. | Choose LPV821QDGKR only for single-channel, sub-1 µA applications where distortion at supply rails is acceptable. |
Compared with ADA4505-4ARUZ, AD8508ARUZ offers superior PSRR (100 dB vs. 95 dB) and proven zero-crossover performance, while LPV821QDGKR trades linearity and bandwidth for ultra-low current - making AD8508ARUZ optimal for multi-channel, precision, battery-constrained designs.
Availability
AD8508ARUZ is available at Aetrix Electronics and suitable for pressure sensors, IR thermometers, hazard detectors, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8508ARUZ 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 AD8505/AD8506/AD8508 family was engineered specifically for ultra-low-power, high-precision signal conditioning in battery-operated sensor nodes - emphasizing rail-to-rail linearity, supply rejection, and thermal stability over wide operating ranges.
FAQ
What is the maximum supply voltage for AD8508ARUZ?
The absolute maximum supply voltage for AD8508ARUZ is 5.5 V. Operation beyond this rating risks permanent damage. The device is fully specified from 1.8 V to 5 V single supply or ±0.9 V to ±2.5 V dual supply, with optimal PSRR and CMRR performance maintained across this range. AD8508ARUZ must not be operated at 5.5 V continuously - design margins require staying within 5 V for reliable long-term function.
Does AD8508ARUZ support true rail-to-rail input without crossover distortion?
Yes, AD8508ARUZ uses an integrated charge pump to bias its CMOS input stage, enabling continuous linear operation from 0 V to VSY with no offset voltage discontinuity. Unlike dual-differential-pair op amps, AD8508ARUZ maintains 105 dB CMRR across the full common-mode range - confirmed in Figure 46 of the Rev. F datasheet. This feature is intrinsic to AD8508ARUZ and does not require external components.
What is the thermal resistance (θJA) of the AD8508ARUZ TSSOP package?
The AD8508ARUZ in 14-lead TSSOP (RU-14) has a simulated θJA of 112°C/W on a 4-layer JEDEC-standard board. This value assumes proper PCB layout with thermal vias under the exposed pad. Measured θJC is 35°C/W, confirming efficient heat transfer from junction to package. These thermal metrics are validated in Table 4 of the AD8508 datasheet Rev. F and apply specifically to AD8508ARUZ - not to WLCSP variants.
Can AD8508ARUZ drive capacitive loads without instability?
AD8508ARUZ is unity-gain stable with capacitive loads up to 100 pF when driving 100 kΩ resistive loads, as shown in Figure 33 and Figure 36 of the datasheet. For loads >100 pF, a series resistor (≥100 Ω) between output and capacitor restores phase margin. This behavior is measured and documented for AD8508ARUZ - no external compensation is needed below 100 pF, simplifying filter design in sensor interfaces.
Is AD8508ARUZ qualified for automotive applications?
AD8508ARUZ is specified for −40°C to +125°C operation and meets industrial reliability standards, but it is not AEC-Q200 qualified. Its 125°C max operating temperature supports under-hood placement in non-safety-critical subsystems (e.g., cabin temperature sensing), though automotive-grade qualification requires additional stress testing beyond AD8508ARUZ's published data. Always verify system-level compliance separately.
AD8508ARUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- 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 (x4 Channels)
- 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:
- 14-TSSOP
AD8508ARUZ FAQ
1.How can I place an order for AD8508ARUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8508ARUZ 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 AD8508ARUZ reliable?
The price and inventory of AD8508ARUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8508ARUZ is usually 5 days.
3.What payment methods are accepted for AD8508ARUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8508ARUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8508ARUZ?
AD8508ARUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8508ARUZ 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 AD8508ARUZ?
For technical support, including AD8508ARUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8508ARUZ requirements.
6.How does Aetrix verify that AD8508ARUZ is sourced from the original manufacturer or authorized distributors?
All AD8508ARUZ 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 AD8508ARUZ meets industry standards.
7.What is the process for return or replacement of AD8508ARUZ?
All AD8508ARUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8508ARUZ, 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 AD8508ARUZ part is unused and in its original packaging.
Return procedure for AD8508ARUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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