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Analog Devices Inc. AD8504ARUZ
- Part No.:
- AD8504ARUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD8504ARUZ.pdf
- Description:
- IC CMOS 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,385
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Product details
Overview
AD8504ARUZ from Analog Devices is a quad micropower CMOS operational amplifier optimized for ultra-low-power, precision signal conditioning in battery-powered systems. It delivers 1 μA maximum supply current per amplifier, 3 mV maximum offset voltage, rail-to-rail input/output swing, and unity-gain stability - enabling high-accuracy sensing at 1.8 V to 5.5 V single-supply operation in portable medical and industrial monitoring devices.
For engineers reviewing the AD8504ARUZ datasheet, AD8504ARUZ pinout, AD8504ARUZ application, or AD8504ARUZ equivalent, key selection criteria include its guaranteed 1 μA/amplifier quiescent current across −40°C to +125°C, rail-to-rail I/O performance at sub-2 V operation, absence of phase reversal, and TSSOP-14 package compatibility with space-constrained PCB layouts.
Technical Context
The AD8504ARUZ integrates four independent precision op-amps on a single die, each featuring picoampere-level input bias current (1 pA typical), 7 kHz gain bandwidth product, and 0.004 V/μs slew rate - optimized for low-frequency, high-impedance sensor interfaces. Its CMOS input stage enables direct connection to high-output-impedance sources like thermistors and pH electrodes without significant loading error.
Designed for single-supply operation down to 1.8 V, the AD8504ARUZ maintains rail-to-rail output swing within 5 mV of supply rails under 100 kΩ load and supports common-mode input voltage from V– to V+, eliminating external level-shifting circuitry in low-voltage data acquisition paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply current per amplifier | 1 μA maximum - enables multi-year battery life in coin-cell-powered remote sensors. |
| Input offset voltage | 3 mV maximum - ensures ≤3 mV output error at unity gain, reducing need for system-level calibration. |
| Input bias current | 1 pA typical - preserves signal integrity when interfacing with >1 GΩ source impedances (e.g., piezoelectric or electrochemical sensors). |
| Rail-to-rail I/O | Full swing from V– to V+ on input and output - maximizes dynamic range in 1.8 V systems, improving SNR by up to 6 dB vs. non-rail-to-rail alternatives. |
| Gain bandwidth product | 7 kHz - sufficient for DC–1 kHz applications including ECG front-ends, smoke detector thresholds, and temperature loop filters. |
| Operating temperature range | −40°C to +125°C - qualified for under-hood automotive, industrial control, and medical equipment environments. |
| Offset voltage drift | 5 μV/°C max (−40°C to +125°C) - limits thermal-induced error to <0.6 mV over full range, critical for uncalibrated portable diagnostics. |
Pinout & Package
AD8504ARUZ is housed in a 14-lead TSSOP (RU-14) package compliant with JEDEC MO-153-AB-1, measuring 5.0 mm × 4.4 mm × 1.2 mm with 0.65 mm lead pitch. The package supports standard reflow soldering and provides thermal resistance θJA = 180°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | −IN A | Inverting input of Amplifier A - accepts differential signals with common-mode range extending to both supply rails. |
| 2 | +IN A | Non-inverting input of Amplifier A - high-impedance node (1 pA bias) suitable for direct sensor connection. |
| 3 | V+ | Positive supply rail - accepts 1.8 V to 5.5 V single supply or ±0.9 V to ±2.75 V dual supply. |
| 4 | OUT B | Output of Amplifier B - rail-to-rail capable, drives loads ≥10 kΩ while maintaining <20 mV saturation voltage. |
| 5 | −IN B | Inverting input of Amplifier B - electrically isolated from other amplifiers; no crosstalk above −60 dB at 1 kHz. |
| 6 | +IN B | Non-inverting input of Amplifier B - identical electrical characteristics to Pin 2, supporting parallel sensor channel processing. |
| 7 | OUT A | Output of Amplifier A - same drive strength and voltage swing as Pin 4; used for primary signal path in quad configurations. |
| 8 | V− | Negative supply rail (GND in single-supply mode) - must be connected directly to low-impedance ground plane for noise immunity. |
| 9 | OUT C | Output of Amplifier C - independently buffered output; enables simultaneous filtering, amplification, and reference buffering. |
| 10 | +IN C | Non-inverting input of Amplifier C - shares same input structure and bias current as Pins 2 and 6. |
| 11 | −IN C | Inverting input of Amplifier C - supports inverting gain configurations with matched input impedance to non-inverting inputs. |
| 12 | OUT D | Output of Amplifier D - fully decoupled output stage; usable as comparator hysteresis generator or precision reference buffer. |
| 13 | +IN D | Non-inverting input of Amplifier D - referenced to internal bias network; stable for use in low-drift voltage followers. |
| 14 | −IN D | Inverting input of Amplifier D - configurable as summing node for multi-sensor analog aggregation. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Guaranteed over full input common-mode range - prevents latch-up or erroneous output transitions when inputs exceed supply rails. |
| Unity-gain stable | Operates without external compensation at gain = 1 - simplifies design of buffers, active filters, and sensor interface stages. |
| Rail-to-rail input | Accepts signals from V− to V+ - eliminates need for external bias resistors in single-supply systems, reducing component count and board area. |
| Low 0.1 Hz–10 Hz noise | 6 μV p-p - minimizes baseline wander in DC-coupled biomedical amplifiers such as pulse oximeters and glucose meter front-ends. |
| High CMRR | 65 dB minimum (−40°C to +125°C) - rejects power supply ripple and EMI in noisy industrial environments without additional filtering. |
Applications
| Portable Medical Sensors | Remote Industrial Monitoring |
|---|---|
Use Scenario: Continuous glucose monitoring (CGM) patch with coin-cell battery and electrochemical sensor. IC Role / Device Role / Timing Role: Quad amplifier configures transimpedance stage (A), reference buffer (B), low-pass filter (C), and comparator hysteresis generator (D). Use Value: 1 μA/quiescent current extends battery life beyond 12 months; rail-to-rail I/O captures full sensor output swing at 1.8 V supply. |
Use Scenario: Wireless vibration sensor node mounted on HVAC motor housing with 10-year battery target. IC Role / Device Role / Timing Role: Amplifier A conditions piezoelectric accelerometer output; B/C/D implement zero-crossing detection, peak-hold, and supply monitoring. Use Value: 1 pA input bias avoids signal loss from high-Z sensor; −40°C to +125°C rating ensures reliability in uncontrolled ambient conditions. |
| Low-Power Threshold Detection | Smoke & Fire Detector Front-End |
Use Scenario: Battery-powered water leak detector using capacitive sensing electrode array. IC Role / Device Role / Timing Role: One amplifier acts as precision comparator with adjustable threshold; others condition reference and sensor signals. Use Value: 3 mV offset voltage enables ±15 mV detection window without trimming; rail-to-rail output directly drives microcontroller GPIO. |
Use Scenario: UL-listed residential smoke detector with photoelectric chamber and CO sensor fusion. IC Role / Device Role / Timing Role: Amplifier A processes scattered-light photodiode current; B buffers thermistor for temperature compensation; C/D support dual-sensor alarm logic. Use Value: No phase reversal prevents false alarms during rapid supply transients; 125°C rating supports enclosed plastic enclosures exposed to sunlight. |
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 | Higher supply current (10 μA/amplifier), lower offset (0.5 mV max), 50 kHz GBW | Better for higher-speed, higher-accuracy applications where power budget allows 10× increase | Select ADA4505-4ARUZ when system requires <1 mV offset and >10 kHz signal bandwidth; AD8504ARUZ remains optimal for strict 1 μA constraints. |
| LP324DR | Higher supply current (20 μA/amplifier), wider supply range (3–32 V), no rail-to-rail output | Suitable for legacy 5 V or 12 V industrial systems where rail-to-rail swing is not required | Choose LP324DR only for cost-sensitive, non-battery applications with ample power margin and higher supply voltages; AD8504ARUZ is superior for modern low-voltage designs. |
Compared with ADA4505-4ARUZ and LP324DR, AD8504ARUZ uniquely balances sub-μA quiescent current, rail-to-rail operation at 1.8 V, and −40°C to +125°C qualification - making it the only quad op amp qualified for ultra-long-life, single-cell, wide-temperature embedded sensing.
Availability
AD8504ARUZ is available at Aetrix Electronics and suitable for portable medical devices, remote industrial sensors, low-power threshold detectors, and smoke/fire detection systems requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for AD8504ARUZ 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, with design centers and manufacturing facilities worldwide.
The AD8502/AD8504 family was developed specifically for ultra-low-power, precision signal conditioning in battery-operated instrumentation - targeting applications where microampere-level supply current, rail-to-rail operation, and wide-temperature reliability are non-negotiable.
FAQ
What is the maximum operating temperature range for AD8504ARUZ?
The AD8504ARUZ is fully specified from −40°C to +125°C, with all key parameters - including supply current (2 μA max), offset voltage (5.5 mV max), and CMRR (65 dB min) - guaranteed across this extended industrial temperature range. This makes AD8504ARUZ suitable for under-hood automotive modules, industrial control cabinets, and outdoor environmental sensors where ambient temperatures exceed +85°C.
Does AD8504ARUZ support true rail-to-rail input and output operation?
Yes, AD8504ARUZ supports rail-to-rail input common-mode voltage (V– to V+) and rail-to-rail output swing (within 5 mV of V– and V+ under 100 kΩ load). At 1.8 V supply, VOH reaches 1.795 V and VOL drops to 1.0 mV - delivering >99% of full-scale dynamic range, which is essential for maximizing resolution in low-voltage ADC interfaces.
Can AD8504ARUZ be used in single-supply configurations below 2.0 V?
Yes, AD8504ARUZ is explicitly characterized and guaranteed for operation down to 1.8 V single supply, with full specification of offset voltage (3 mV max), supply current (1 μA max), and rail-to-rail I/O performance. Electrical Characteristics tables in the datasheet provide complete parametric data at VS = 1.8 V, confirming robust functionality in coin-cell and energy-harvesting systems.
Is AD8504ARUZ pin-compatible with other quad op amps in TSSOP-14 packages?
No, AD8504ARUZ has a unique pinout defined in Figure 2 of its datasheet (RU-14 package), with dedicated V+ and V− pins and interleaved amplifier inputs/outputs. It is not pin-compatible with generic quad op amps like LM324 or TLV2464. Layout must follow Analog Devices' recommended footprint and grounding practices to maintain low-noise performance and thermal stability.
What is the typical input bias current of AD8504ARUZ and why does it matter?
The typical input bias current of AD8504ARUZ is 1 pA at 25°C, with a maximum of 600 pA over −40°C to +125°C. This ultra-low value prevents loading errors when interfacing with high-impedance sensors - such as pH electrodes (>1 GΩ), thermistors, or photodiodes - ensuring signal fidelity without external guarding or active bias cancellation circuits.
AD8504ARUZ 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:
- 0.004V/µs
- Gain Bandwidth Product:
- 7 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 750nA (x4 Channels)
- Current - Output / Channel:
- 5 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
AD8504ARUZ FAQ
1.How can I place an order for AD8504ARUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8504ARUZ 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 AD8504ARUZ reliable?
The price and inventory of AD8504ARUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8504ARUZ is usually 5 days.
3.What payment methods are accepted for AD8504ARUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8504ARUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8504ARUZ?
AD8504ARUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8504ARUZ 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 AD8504ARUZ?
For technical support, including AD8504ARUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8504ARUZ requirements.
6.How does Aetrix verify that AD8504ARUZ is sourced from the original manufacturer or authorized distributors?
All AD8504ARUZ 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 AD8504ARUZ meets industry standards.
7.What is the process for return or replacement of AD8504ARUZ?
All AD8504ARUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8504ARUZ, 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 AD8504ARUZ part is unused and in its original packaging.
Return procedure for AD8504ARUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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