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Analog Devices Inc. AD8618ARZ
- Part No.:
- AD8618ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8618ARZ.pdf
- Description:
- IC CMOS 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:555
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Product details
Overview
AD8618ARZ from Analog Devices is a quad, rail-to-rail input/output precision operational amplifier optimized for low-noise, high-bandwidth signal conditioning in single-supply systems. It delivers 24 MHz gain bandwidth, 12 V/µs slew rate, 65 µV max offset voltage, and 8 nV/√Hz voltage noise density at 1 kHz - enabling accurate buffering of CMOS ADCs, photodiode preamplifiers, and audio line drivers in portable instrumentation.
For engineers reviewing the AD8618ARZ datasheet, AD8618ARZ pinout, AD8618ARZ application, or AD8618ARZ equivalent, this page provides verified specifications, SOIC-14 package terminal mapping, real-world use cases in sensor interfaces and DAC output stages, and two validated alternative op-amps with documented performance trade-offs.
Technical Context
The AD8618ARZ employs Analog Devices' patented DigiTrim® trimming to achieve sub-100 µV offset without laser calibration, supporting stable DC precision across −40°C to +125°C. Its CMOS input stage delivers 1 pA typical input bias current and rail-to-rail common-mode range (0 V to VS), allowing direct interfacing with wide-swing ASICs and battery-powered sensors.
Internally compensated for unity-gain stability, it maintains 63° phase margin at 5 V supply and drives ±150 mA into low-impedance loads - a key differentiator within the AD861x family - while sustaining <0.5 µs settling time to 0.01% with 2 kΩ load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 24 MHz - enables stable closed-loop operation up to 100 kHz in 2nd-order active filters with Butterworth response. |
| Input Offset Voltage (max) | 65 µV - ensures ≤0.13% error in 50 mV full-scale sensor signal amplification at room temperature. |
| Slew Rate | 12 V/µs - supports clean 1 VPP output at 1 MHz without distortion in audio line driver applications. |
| Voltage Noise Density | 8 nV/√Hz @ 1 kHz - critical for preserving SNR in photodiode preamplifiers with >10 MΩ transimpedance gain. |
| Output Drive Current | ±150 mA - directly drives 32 Ω headphones or 50 Ω transmission lines without external buffers. |
| Supply Range | 2.7 V to 5.0 V - compatible with Li-ion (3.0–4.2 V) and regulated 3.3 V/5.0 V rails in portable medical devices. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive sensor signal conditioning and industrial PLC analog I/O modules. |
Pinout & Package
AD8618ARZ is housed in a 14-lead SOIC (R-14) package with standard JEDEC MO-187-AA footprint, 1.27 mm pitch, and 8.65 mm × 3.90 mm body dimensions. Thermal resistance θJA = 120°C/W enables 150 mW dissipation at 70°C ambient before reaching 150°C junction limit.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | Output A/B/C/D | Four independent rail-to-rail outputs capable of sourcing/sinking 150 mA each; no phase reversal on overdrive. |
| 2, 6, 9, 13 | Inverting Input A/B/C/D | High-impedance CMOS inputs (1 pA bias) accepting signals from 0 V to VS; require external series resistors if overvoltage protected. |
| 3, 5, 10, 12 | Non-inverting Input A/B/C/D | Matched to inverting inputs for precision differential gain; common-mode range extends to supply rails. |
| 4 | Positive Supply (V+) | Single 2.7–5.0 V supply connection; decoupling capacitor required within 1 cm for stability at >10 MHz. |
| 11 | Negative Supply (V−) | Ground reference for single-supply operation; must be connected to system GND - not left floating. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Immunity to input overvoltage-induced inversion prevents latch-up and system crashes in feedback-critical sensor interfaces. |
| Rail-to-rail I/O | Full 0 V to VS input common-mode range and output swing preserves dynamic range when buffering 12-bit+ ADCs with 3.3 V supplies. |
| DigiTrim® precision | 65 µV max offset achieved without laser trimming - eliminates calibration cost and improves long-term drift stability vs. trimmed competitors. |
| Low 1/f noise | 2.4 µVPP (0.1–10 Hz) enables stable DC-coupled amplification of thermocouple or strain gauge signals without baseline wander. |
| Capacitive load drive | Stable with up to 500 pF loads - supports direct connection to LCD column drivers or long PCB traces without external snubbers. |
Applications
| Barcode scanners | Battery-powered instrumentation |
|---|---|
Use Scenario: Amplifying low-amplitude analog pulses from CCD or CMOS image sensors during linear scan motion. IC Role / Device Role / Timing Role: Precision transimpedance amplifier converting photodiode current to voltage with minimal offset-induced baseline shift. Use Value: 65 µV max offset ensures <0.5% amplitude error in 10 mV peak signals; 24 MHz bandwidth captures 500 kHz modulation edges without roll-off. | Use Scenario: Signal conditioning front-end for handheld multimeters, pH meters, or portable gas analyzers operating from coin cells. IC Role / Device Role / Timing Role: Rail-to-rail input buffer isolating high-impedance sensor electrodes from 12-bit SAR ADC inputs. Use Value: 1 pA input bias current prevents >10 mV error across 10 MΩ electrode impedance; 2 mA supply current extends battery life beyond 100 hours. |
| Photodiode amplification | Multipole filters |
Use Scenario: High-speed I/V conversion in optical smoke detectors or fiber-optic receiver modules requiring >1 MHz bandwidth. IC Role / Device Role / Timing Role: Low-noise, high-gain transimpedance amplifier with feedback compensation for photodiode junction capacitance. Use Value: 8 nV/√Hz noise density and 24 MHz GBP enable 100 MΩ transimpedance gain with <10 kHz noise bandwidth - sufficient for 100 kbps data recovery. | Use Scenario: Implementing 4th-order low-pass filtering in portable ECG monitors or audio anti-aliasing paths. IC Role / Device Role / Timing Role: Quad op-amp configured as cascaded 2nd-order Sallen-Key stages with matched AC response. Use Value: Channel separation >115 dB at 10 kHz prevents crosstalk between dual-channel biopotential acquisition; unity-gain stability avoids tuning complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2188AIDR | Lower offset (25 µV max) but slower slew rate (0.8 V/µs); 1.8–36 V supply range vs. AD8618ARZ's 2.7–5 V. | Better for ultra-precision DC measurements; unsuitable for >100 kHz AC signal paths due to bandwidth limitation. | Select OPA2188AIDR when offset drift (<0.1 µV/°C) dominates over speed; avoid when driving capacitive loads >100 pF at high frequency. |
| ADA4625-2ACPZ-R7 | Higher bandwidth (80 MHz), lower noise (4.2 nV/√Hz), but higher supply current (3.4 mA per amp) and no rail-to-rail output. | Preferred for wideband photodiode preamps needing >10 MHz signal fidelity; incompatible with rail-to-rail output requirements. | Choose ADA4625-2ACPZ-R7 for high-frequency optical sensing; retain AD8618ARZ when single-supply rail-to-rail output and low power are mandatory. |
Compared with OPA2188AIDR and ADA4625-2ACPZ-R7, AD8618ARZ uniquely balances 24 MHz bandwidth, rail-to-rail I/O, 65 µV offset, and 2 mA supply current in a quad SOIC package - making it optimal for space-constrained, battery-operated precision analog front-ends where both DC accuracy and AC fidelity matter.
Availability
AD8618ARZ is available at Aetrix Electronics and suitable for barcode scanners, portable medical devices, photodiode signal chains, and multipole filter designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8618ARZ 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 worldwide and ISO 9001-certified manufacturing.
The AD861x family was engineered specifically for precision, low-voltage, single-supply signal conditioning - targeting portable instrumentation, sensor interfaces, and high-fidelity audio where rail-to-rail operation, low noise, and micro-power efficiency converge.
FAQ
What is the maximum output current capability of the AD8618ARZ?
The AD8618ARZ delivers ±150 mA per amplifier into low-impedance loads at 5 V supply, verified per Table 1 in the Rev. G datasheet. This enables direct drive of 32 Ω headphones or 50 Ω transmission lines without external buffers. Derating applies at elevated temperatures: output current drops to ±50 mA at 2.7 V supply and decreases further above 85°C ambient due to thermal limits.
Does the AD8618ARZ support true rail-to-rail input and output operation?
Yes, the AD8618ARZ supports rail-to-rail input common-mode voltage (0 V to VS) and rail-to-rail output swing (within 15 mV of each rail at 1 mA load). This is confirmed in the General Description and Figure 10 of the AD8615/AD8616/AD8618 Rev. G datasheet, enabling full utilization of 3.3 V or 5 V supply headroom in single-supply systems.
What is the typical input bias current for the AD8618ARZ, and how does it vary with temperature?
The AD8618ARZ exhibits 0.2–1 pA typical input bias current at 25°C, rising to 550 pA maximum over −40°C to +125°C (Table 1). This ultra-low bias is enabled by its CMOS input stage and remains stable across temperature - critical for guarding high-impedance pH electrodes or piezoelectric sensors where leakage currents degrade accuracy.
Can the AD8618ARZ drive heavy capacitive loads, and what is the recommended compensation method?
The AD8618ARZ remains stable with up to 500 pF capacitive loads but shows overshoot above 100 kHz. For robust operation, Analog Devices recommends a snubber network (200 Ω + 500 pF) in series with the output, as shown in Figure 38 of the Rev. G datasheet. This reduces overshoot by >30% and eliminates ringing without sacrificing DC precision.
Is the AD8618ARZ pin-compatible with other op-amps in the AD861x family?
No - the AD8618ARZ uses a 14-pin SOIC package with dedicated pins for four independent amplifiers (pins 1,7,8,14 = outputs; pins 2,6,9,13 = inverting inputs; pins 3,5,10,12 = non-inverting inputs), whereas AD8615 (5-pin TSOT) and AD8616 (8-pin MSOP/SOIC) have different pin counts and layouts. Direct substitution requires PCB redesign.
AD8618ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- DigiTrim®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 12V/µs
- Gain Bandwidth Product:
- 24 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 23 µV
- Current - Supply:
- 1.7mA (x4 Channels)
- Current - Output / Channel:
- 150 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
AD8618ARZ FAQ
1.How can I place an order for AD8618ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8618ARZ 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 AD8618ARZ reliable?
The price and inventory of AD8618ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8618ARZ is usually 5 days.
3.What payment methods are accepted for AD8618ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8618ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8618ARZ?
AD8618ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8618ARZ 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 AD8618ARZ?
For technical support, including AD8618ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8618ARZ requirements.
6.How does Aetrix verify that AD8618ARZ is sourced from the original manufacturer or authorized distributors?
All AD8618ARZ 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 AD8618ARZ meets industry standards.
7.What is the process for return or replacement of AD8618ARZ?
All AD8618ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8618ARZ, 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 AD8618ARZ part is unused and in its original packaging.
Return procedure for AD8618ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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