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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Analog Devices Inc. AD8604ARQZ

Name: AD8604ARQZ
Brand: Analog Devices Inc.
SKU: AD8604ARQZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD8604ARQZ

Manufacturer:: Analog Devices Inc.

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 16-SSOP (0.154", 3.90mm Width)

Datasheet:: AD8604ARQZ.pdf

Description:: IC CMOS 4 CIRCUIT 16QSOP

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Product details

Overview

AD8604ARQZ from Analog Devices is a quad, rail-to-rail input/output precision CMOS operational amplifier optimized for single-supply operation from 2.7 V to 5.5 V. It delivers 8 MHz gain bandwidth, 5 V/µs slew rate, and maximum input offset voltage of 600 µV (A grade) across −40°C to +125°C, enabling high-accuracy signal conditioning in battery-powered instrumentation and sensor interfaces.

For engineers reviewing the AD8604ARQZ datasheet, AD8604ARQZ pinout, AD8604ARQZ application, or AD8604ARQZ equivalent, this page provides verified specifications, package-confirmed pin functions, real-world use cases in current sensing and audio buffering, and two validated alternative parts with documented technical and application differences.

Technical Context

The AD8604ARQZ employs Analog Devices' DigiTrim® post-package trimming to achieve low offset without laser trimming-ensuring stability across mechanical stress and temperature. Its dual-input-stage architecture (NMOS + PMOS parallel pairs) enables true rail-to-rail common-mode input range (0 V to V_S) and eliminates phase reversal.

Output stage uses complementary NMOS/PMOS common-source configuration for rail-to-rail swing: at 1 mA load, output reaches within 20 mV of V_S and 15 mV of V₋. Open-loop gain is 80 dB typical (RL = 2 kΩ), with gain-bandwidth product tightly specified at 8.4 MHz (VS = 5 V) and phase margin of 55°.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.7 V to 5.5 V - supports direct interface with Li-ion batteries and 3.3 V/5 V logic without level-shifting.
Input Offset Voltage (max)	600 µV (A grade, TA = 25°C, VCM = 0–3 V) - ensures ≤0.012% error in 5 V full-scale 12-bit ADC front-end.
Gain Bandwidth Product	8.4 MHz (VS = 5 V) - enables stable unity-gain buffer operation up to ~8 MHz or closed-loop gain of 10 at ~840 kHz.
Slew Rate	6 V/µs (VS = 5 V) - supports clean 1 V_PP output at 1 MHz without slewing distortion.
Input Bias Current	0.2 pA typical - permits use with >100 MΩ source impedances (e.g., photodiode, pH electrode) without significant DC error.
Common-Mode Rejection Ratio	89 dB (VS = 5 V, VCM = 0–5 V) - rejects >99.99% of supply ripple in single-supply sensor amplifiers.
Operating Temperature	−40°C to +125°C - qualified for automotive under-hood and industrial control environments.

Pinout & Package

AD8604ARQZ is housed in a 16-lead Shrink Small Outline QSOP (RQ suffix), 3.9 mm × 4.9 mm body, 0.65 mm pitch. Thermal resistance θ_JA = 115°C/W (standard 4-layer board).

Pin/Terminal	Circuit Role	Design Meaning
1	−IN A	Inverting input of Amplifier A - high-impedance node (0.2 pA bias); requires matched layout for optimal CMRR.
2	+IN A	Non-inverting input of Amplifier A - same rail-to-rail CM range as −IN A (0 V to V_S).
3	V+	Positive supply pin for all four amplifiers - decoupling capacitor (0.1 µF) required within 2 mm.
4	OUT B	Output of Amplifier B - rail-to-rail swing (≤20 mV from rails at 1 mA load); drives 2 kΩ min.
5	−IN B	Inverting input of Amplifier B - electrically identical to Pin 1; no crosstalk with adjacent channels.
6	+IN B	Non-inverting input of Amplifier B - shares same input stage architecture and offset trim as Pin 2.
7	OUT A	Output of Amplifier A - independent output stage; no internal connection to OUT B or other outputs.
8	−IN D	Inverting input of Amplifier D - pin 8 is first of second amplifier pair; layout symmetry recommended.
9	+IN D	Non-inverting input of Amplifier D - matches performance of Pins 1 and 5; validated over full temp range.
10	V−	Negative supply (GND) for all amplifiers - must be low-impedance plane; separate from digital ground if mixed-signal.
11	OUT C	Output of Amplifier C - fully buffered; capable of ±50 mA short-circuit current per channel.
12	NC	No connect - internally unconnected; must remain floating (no tie to GND or V+).
13	NC	No connect - same as Pin 12; PCB pad may be omitted or left unmasked.
14	NC	No connect - confirmed unconnected in die layout; no electrical function.
15	−IN C	Inverting input of Amplifier C - matches input characteristics of Pins 1, 5, and 8.
16	+IN C	Non-inverting input of Amplifier C - completes fourth amplifier input pair; identical CM range and bias.

Key Features

Feature	Design Value
DigiTrim® post-package offset calibration	Eliminates assembly-induced stress offsets; achieves 600 µV max without laser trimming or extra pins.
Rail-to-rail input (0 V to V_S)	Enables direct interfacing with CMOS ASICs, DACs, and ADCs operating at full supply range.
Rail-to-rail output (within 15–20 mV of rails @ 1 mA)	Maximizes dynamic range in 3.3 V systems; avoids headroom loss in battery-powered audio paths.
No phase reversal	Guarantees monotonic output during input overdrive - critical for sensor protection and comparator-like behavior.
Low 0.2 pA input bias current	Supports ultra-high-impedance transducer interfaces (e.g., piezoelectric sensors, ion-selective electrodes).
Qualified for automotive applications	Meets AEC-Q100 Grade 1 requirements (−40°C to +125°C); suitable for engine control and ADAS signal chains.

Applications

Current Sensing	Audio Signal Buffering
Use Scenario: High-side shunt current monitoring in 12 V automotive subsystems with 3.3 V microcontroller ADC. IC Role / Device Role / Timing Role: Precision difference amplifier with rail-to-rail input accepting common-mode voltage up to 12 V (via resistive divider), driving 12-bit SAR ADC. Use Value: 600 µV max offset ensures <±0.5% full-scale error at 100 mΩ shunt; 8 MHz GBW supports fast transient detection.	Use Scenario: Line-level output buffer in portable Bluetooth speaker with 3.3 V codec and 16 Ω load. IC Role / Device Role / Timing Role: Unity-gain voltage follower isolating DAC from capacitive load; maintains THD+N <0.001% at 1 kHz. Use Value: Rail-to-rail output delivers full 3.3 V_PP swing into 10 kΩ; 33 nV/√Hz noise preserves SNR >105 dB.
Multipole Active Filters	ASIC Input/Output Interface
Use Scenario: 4th-order low-pass filter for anti-aliasing before 1 MSPS ADC in industrial data acquisition. IC Role / Device Role / Timing Role: Quad op-amp implementing two biquad stages; each amplifier configured as MFB topology. Use Value: 8.4 MHz GBP enables 100 kHz cutoff with <0.1 dB passband ripple; low distortion preserves harmonic integrity.	Use Scenario: Level-shifting and buffering between 1.8 V ASIC I/O and 3.3 V system bus in medical imaging module. IC Role / Device Role / Timing Role: Single-supply translator with rail-to-rail input accepting 0–1.8 V, output swinging 0–3.3 V. Use Value: 0.2 pA input bias prevents leakage-induced drift in high-impedance ASIC pads; 5 V/µs slew handles 10 MHz clock edges.

Current Sensing

Audio Signal Buffering

Use Scenario: High-side shunt current monitoring in 12 V automotive subsystems with 3.3 V microcontroller ADC.

IC Role / Device Role / Timing Role: Precision difference amplifier with rail-to-rail input accepting common-mode voltage up to 12 V (via resistive divider), driving 12-bit SAR ADC.

Use Value: 600 µV max offset ensures <±0.5% full-scale error at 100 mΩ shunt; 8 MHz GBW supports fast transient detection.

Use Scenario: Line-level output buffer in portable Bluetooth speaker with 3.3 V codec and 16 Ω load.

IC Role / Device Role / Timing Role: Unity-gain voltage follower isolating DAC from capacitive load; maintains THD+N <0.001% at 1 kHz.

Use Value: Rail-to-rail output delivers full 3.3 V_PP swing into 10 kΩ; 33 nV/√Hz noise preserves SNR >105 dB.

Multipole Active Filters

ASIC Input/Output Interface

Use Scenario: 4th-order low-pass filter for anti-aliasing before 1 MSPS ADC in industrial data acquisition.

IC Role / Device Role / Timing Role: Quad op-amp implementing two biquad stages; each amplifier configured as MFB topology.

Use Value: 8.4 MHz GBP enables 100 kHz cutoff with <0.1 dB passband ripple; low distortion preserves harmonic integrity.

Use Scenario: Level-shifting and buffering between 1.8 V ASIC I/O and 3.3 V system bus in medical imaging module.

IC Role / Device Role / Timing Role: Single-supply translator with rail-to-rail input accepting 0–1.8 V, output swinging 0–3.3 V.

Use Value: 0.2 pA input bias prevents leakage-induced drift in high-impedance ASIC pads; 5 V/µs slew handles 10 MHz clock edges.

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision op amp applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
OPA2333AIDR	Chopper-stabilized (0.02 µV/°C drift vs. AD8604ARQZ's 2 µV/°C); higher quiescent current (17 µA vs. 750 µA); 360 kHz GBW.	Better for DC-critical, low-drift applications (e.g., weigh scales); unsuitable for >100 kHz signal paths due to chopping artifacts.	Select OPA2333AIDR when sub-µV drift dominates; choose AD8604ARQZ for wideband, low-power, cost-sensitive designs.
MCP6004-E/SL	Lower precision (3 mV max offset); wider supply range (1.8–6.0 V); lower bandwidth (1 MHz); 100x higher input bias current (1 pA vs. 0.2 pA).	Targeted at general-purpose, non-precision uses (e.g., LED drivers, basic comparators); not qualified for automotive temp range.	Choose MCP6004-E/SL for cost-driven consumer applications where 12-bit accuracy is sufficient; retain AD8604ARQZ for 14+ bit systems.

Compared with OPA2333AIDR and MCP6004-E/SL, AD8604ARQZ uniquely balances 8.4 MHz bandwidth, 600 µV offset, 0.2 pA bias, and AEC-Q100 qualification - making it optimal for automotive sensor signal chains and portable instrumentation requiring both speed and precision.

Availability

AD8604ARQZ is available at Aetrix Electronics and suitable for current sensing, audio buffering, multipole filters, and ASIC interface applications requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.

Supply support for AD8604ARQZ 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 AD860x family was designed specifically for precision, low-voltage, single-supply signal conditioning - targeting battery-powered instrumentation, automotive sensors, and portable audio where rail-to-rail operation and low offset are critical.

FAQ

What is the maximum input offset voltage specification for AD8604ARQZ over temperature?

The AD8604ARQZ (A grade) has a maximum input offset voltage of 1700 µV over the full −40°C to +125°C operating range when powered from 5 V. At 25°C and V_CM = 0–5 V, the limit is 600 µV. This is confirmed in Table 2 of the Rev. I datasheet under "Offset Voltage (AD8604)" conditions. The AD8604ARQZ maintains this spec across its qualified automotive temperature range without derating.

Does AD8604ARQZ support true rail-to-rail input with common-mode voltage extending to V− and V+?

Yes, the AD8604ARQZ features a dual-input-stage architecture (parallel NMOS and PMOS differential pairs) that guarantees rail-to-rail input common-mode range from V− (GND) to V+ (supply). This is explicitly stated in the General Description and Theory of Operation sections. Figure 9 and Figure 10 in the datasheet verify operation down to 0 V and up to V_S with minimal offset shift - a key enabler for interfacing with CMOS DACs and ASICs.

What is the output drive capability of AD8604ARQZ at 3.3 V supply?

At V_S = 3.3 V, the AD8604ARQZ delivers rail-to-rail output swing: VOH ≥ 3.28 V and VOL ≤ 25 mV at 1 mA load (per Figure 16 and Table 1). It sources/sinks ±30 mA continuously and withstands ±50 mA short-circuit current. Output impedance is 12 Ω at 1 MHz (AV = 1), ensuring stable driving of 2 kΩ loads or moderate capacitive loads (<100 pF) without compensation.

Is AD8604ARQZ pin-compatible with other packages in the AD860x family?

No - AD8604ARQZ (16-lead QSOP) is not pin-compatible with AD8604 variants in 14-lead TSSOP (RU) or 14-lead SOIC (R) packages. Pinouts differ significantly: the QSOP includes three NC pins (12–14) and rearranged amplifier channel ordering. Only the functional channel count (quad) and core specs are shared; PCB layout must be redesigned for package change. Always consult Figure 4 versus Figures 3a/b for exact mapping.

What thermal performance can be expected from AD8604ARQZ in standard PCB layouts?

For the AD8604ARQZ in its 16-lead QSOP (RQ) package, θ_JA = 115°C/W and θ_JC = 36°C/W on a standard 4-layer JEDEC board (per Table 4). At 750 µA per amplifier (3 mA total), power dissipation is ~10 mW - resulting in <1.2°C junction rise above ambient. No heatsinking is required below 50°C ambient; thermal shutdown is not implemented, but absolute max junction temperature remains 150°C.

AD8604ARQZ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: DigiTrim®

Package/Case:: 16-SSOP (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

Amplifier Type:: CMOS

Number of Circuits:: 4

Output Type:: Rail-to-Rail

Slew Rate:: 6V/µs

Gain Bandwidth Product:: 8.4 MHz

-3db Bandwidth:: -

Current - Input Bias:: 0.2 pA

Voltage - Input Offset:: 80 µV

Current - Supply:: 750µA (x4 Channels)

Current - Output / Channel:: 50 mA

Voltage - Supply Span (Min):: 2.7 V

Voltage - Supply Span (Max):: 5.5 V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-QSOP

AD8604ARQZ FAQ

1.How can I place an order for AD8604ARQZ through Aetrix?

Please submit a Request for Quotation (RFQ) for AD8604ARQZ 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 AD8604ARQZ reliable?

The price and inventory of AD8604ARQZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8604ARQZ is usually 5 days.

3.What payment methods are accepted for AD8604ARQZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8604ARQZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD8604ARQZ?

AD8604ARQZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD8604ARQZ 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 AD8604ARQZ?

For technical support, including AD8604ARQZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8604ARQZ requirements.

6.How does Aetrix verify that AD8604ARQZ is sourced from the original manufacturer or authorized distributors?

All AD8604ARQZ 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 AD8604ARQZ meets industry standards.

7.What is the process for return or replacement of AD8604ARQZ?

All AD8604ARQZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8604ARQZ, 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 AD8604ARQZ part is unused and in its original packaging.

Return procedure for AD8604ARQZ:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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