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Analog Devices Inc. AD8643ARZ
- Part No.:
- AD8643ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8643ARZ.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:306
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Product details
Overview
AD8643ARZ from Analog Devices is a quad-channel, rail-to-rail output, precision JFET-input operational amplifier optimized for low-power, high-accuracy signal conditioning in single- and dual-supply systems. It delivers 250 µA max supply current per amplifier, 1 pA max input bias current, and 750 µV max offset voltage at 25°C - enabling high-fidelity photodiode amplification, precision current sensing, and battery-powered instrumentation.
For engineers reviewing the AD8643ARZ datasheet, AD8643ARZ pinout, AD8643ARZ application, or AD8643ARZ equivalent, this page provides verified technical context, SOIC-14 package mapping, real-world application cards, and two validated alternative parts with documented functional and packaging differences.
Technical Context
The AD8643ARZ implements a JFET-input stage with no phase reversal and unity-gain stability, supporting capacitive loads >500 pF without compensation. Its rail-to-rail output swing (within 50 mV of rails at ±13 V) and wide input common-mode range (0 V to 3 V on 5 V supply, −13 V to +10 V on ±13 V) allow direct interfacing with CMOS DACs and ASICs in space-constrained industrial controls.
Specified over −40°C to +125°C, it maintains 2.5 µV/°C offset drift and 2.5 MHz gain bandwidth product across temperature. The SOIC-14 package (R-14) features exposed pad grounding to V+, delivering θJA = 110°C/W for thermal reliability in multichannel boards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current/Amplifier | 250 µA max at 25°C - enables 4-channel operation at <1 mA total quiescent draw for battery life extension. |
| Input Bias Current | 1 pA max at 25°C - preserves signal integrity in high-impedance photodiode and sensor front-ends. |
| Offset Voltage | 750 µV max at 25°C - ensures ≤0.015% error in 5 V full-scale precision current-sense applications. |
| Gain Bandwidth Product | 2.5 MHz - supports stable closed-loop gain ≥+10 up to 250 kHz for anti-aliasing filter design. |
| Rail-to-Rail Output Swing | Within 50 mV of rails at ±13 V - maximizes dynamic range when driving ADC inputs or analog switches. |
| Operating Temperature Range | −40°C to +125°C - qualified for under-hood automotive sensors and industrial PLC I/O modules. |
| Common-Mode Rejection Ratio | 90 dB min (±13 V supply) - rejects power supply ripple and ground noise in noisy factory environments. |
Pinout & Package
AD8643ARZ is housed in a 14-lead SOIC_N (R-14) package with standard JEDEC MS-012-AB footprint (8.75 mm × 4.00 mm), lead-free finish, and exposed thermal pad connected to V+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads up to ±6 mA while maintaining rail-to-rail swing. |
| 2 | –IN A | Inverting input for channel A - high-impedance JFET node (1 pA bias) for precision feedback networks. |
| 3 | +IN A | Non-inverting input for channel A - accepts common-mode voltages from 0 V to 3 V on 5 V supply. |
| 4 | V– | Negative supply rail - connects to ground (single-supply) or negative rail (dual-supply). |
| 5 | +IN B | Non-inverting input for channel B - electrically isolated from other inputs; shares same V–/V+ rails. |
| 6 | –IN B | Inverting input for channel B - matched bias and offset characteristics to channel A. |
| 7 | OUT B | Amplifier B output - identical AC/DC performance to OUT A; supports independent gain configurations. |
| 8 | V+ | Positive supply rail - powers all four amplifiers; exposed pad must be soldered to V+ for thermal management. |
| 9 | –IN C | Inverting input for channel C - enables three independent inverting configurations on one IC. |
| 10 | +IN C | Non-inverting input for channel C - supports differential or single-ended input topologies. |
| 11 | V– | Negative supply rail - shared return path for all four amplifiers; low-impedance connection required. |
| 12 | +IN D | Non-inverting input for channel D - allows simultaneous buffering of four independent analog signals. |
| 13 | –IN D | Inverting input for channel D - matched to other channels for multichannel system calibration. |
| 14 | OUT D | Amplifier D output - completes quad-channel functionality; supports unity-gain stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Prevents catastrophic output latch-up during input overdrive - critical for sensor protection in ATE systems. |
| Rail-to-rail output | Delivers full 26 Vpp swing on ±13 V supplies, eliminating level-shifting circuitry in wide-dynamic-range designs. |
| Unity-gain stable | Operates reliably with 0 dB gain and 100% feedback - simplifies active filter and buffer implementation. |
| Low 1/f noise | 4.0 µV p-p (0.1 Hz to 10 Hz) enables stable DC-coupled measurements in medical ECG front-ends. |
| High CMRR | 90 dB minimum rejects common-mode interference from motor drives and switching power supplies. |
Applications
| Photodiode Amplification | Precision Current Sensing |
|---|---|
|
Use Scenario: Converting nanoamp-level photocurrent from silicon photodiodes into measurable voltage signals in portable spectrometers. IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input bias current (1 pA) preserving signal-to-noise ratio. Use Value: Enables detection of sub-nA photocurrents without significant input error - critical for low-light analytical instruments. |
Use Scenario: Measuring bidirectional battery charge/discharge current in energy storage systems using shunt resistors. IC Role / Device Role / Timing Role: Precision difference amplifier with 750 µV max offset, rejecting common-mode voltage up to 13 V. Use Value: Achieves ±0.1% current measurement accuracy over −40°C to +125°C without recalibration. |
| Medical Instrumentation | Industrial Process Control |
|
Use Scenario: Amplifying low-amplitude bio-signals (e.g., EEG, EMG) in handheld diagnostic devices with limited battery capacity. IC Role / Device Role / Timing Role: Quad-channel signal conditioner providing simultaneous amplification, filtering, and level-shifting. Use Value: 250 µA per amplifier enables 4-channel acquisition at <1 mA total, extending device runtime beyond 72 hours. |
Use Scenario: Conditioning 4–20 mA loop sensor outputs in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Rail-to-rail output buffer isolating field transducers from noisy digital backplanes. Use Value: 125°C operating range and 110°C/W thermal resistance ensure reliable operation in uncooled control cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8643ACPZ-REEL7 | LFCSP-16 (3 mm × 3 mm) vs. SOIC-14; lower θJA (81°C/W); same electrical specs. | Better thermal performance in dense PCB layouts; requires rework for land pattern and soldering profile. | Select for space-constrained, thermally demanding applications where board area is premium. |
| OPA2188AIDR | Zero-drift architecture; 0.03 µV/°C drift vs. 2.5 µV/°C; higher supply current (410 µA); SOIC-8 dual only. | Superior long-term DC stability for metrology-grade references; not quad-channel; no rail-to-rail output. | Select when ultra-low drift dominates over channel count and output swing requirements. |
Compared with AD8643ACPZ-REEL7, AD8643ARZ trades thermal efficiency for legacy SOIC compatibility and simpler assembly; versus OPA2188AIDR, it offers quad-channel integration and rail-to-rail output at the cost of higher drift - making AD8643ARZ optimal for multichannel industrial signal chains where moderate drift is acceptable.
Availability
AD8643ARZ is available at Aetrix Electronics and suitable for photodiode amplification, precision current sensing, and industrial process control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8643ARZ 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 AD864x family was designed specifically for low-power, high-precision analog signal conditioning in battery-operated and thermally constrained industrial and medical systems - emphasizing JFET input integrity, rail-to-rail output drive, and extended temperature operation.
FAQ
What is the maximum capacitive load the AD8643ARZ can drive without instability?
The AD8643ARZ remains stable with capacitive loads exceeding 500 pF, as confirmed in the datasheet's typical performance characteristics. This capability eliminates the need for external isolation resistors in photodiode transimpedance amplifier designs and simplifies driving ADC input capacitance directly. For loads >1 nF, a small series resistor (10–50 Ω) at the output is recommended to maintain phase margin above 50°.
Does the AD8643ARZ support true rail-to-rail input operation?
No - the AD8643ARZ features rail-to-rail *output* but not rail-to-rail *input*. Its input common-mode voltage range is 0 V to 3 V on a 5 V supply and −13 V to +10 V on ±13 V supplies. This means it cannot accept inputs at the negative rail in single-supply mode, unlike some CMOS-input op-amps. Designers must ensure input signals stay within these bounds to avoid clipping or increased distortion.
How does the exposed pad on the AD8643ARZ SOIC-14 package function?
The AD8643ARZ SOIC-14 (R-14) package does not include an exposed thermal pad - that feature applies only to the LFCSP variant (AD8643ACPZ). The R-14 package uses standard SOIC construction with no internal thermal pad connection. Thermal management relies on copper pour on the PCB connected to pins 4 (V–) and 8 (V+), achieving θJA = 110°C/W per the datasheet.
Can the AD8643ARZ operate from a single 3.3 V supply?
No - the AD8643ARZ requires a minimum total supply voltage of 5 V (i.e., V+ − V– ≥ 5 V). It is not specified for 3.3 V operation. Attempting to run it from 3.3 V will result in undefined behavior, including degraded output swing, increased offset, and potential failure to meet AC specifications. Use AD8605 or AD8615 for true 2.7 V to 5.5 V single-supply operation.
What is the guaranteed offset voltage specification for AD8643ARZ over temperature?
The AD8643ARZ guarantees ≤1.5 mV maximum offset voltage across the full −40°C to +125°C operating range, as stated in Table 1 of the Rev. F datasheet. At 25°C, the limit is tighter: 750 µV max. This 1.5 mV worst-case value includes both initial offset and drift contribution, ensuring predictable DC error in high-temperature industrial environments without recalibration.
AD8643ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- 3.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.25 pA
- Voltage - Input Offset:
- 70 µV
- Current - Supply:
- 200µA (x4 Channels)
- Current - Output / Channel:
- 12 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 26 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
AD8643ARZ FAQ
1.How can I place an order for AD8643ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8643ARZ 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 AD8643ARZ reliable?
The price and inventory of AD8643ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8643ARZ is usually 5 days.
3.What payment methods are accepted for AD8643ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8643ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8643ARZ?
AD8643ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8643ARZ 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 AD8643ARZ?
For technical support, including AD8643ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8643ARZ requirements.
6.How does Aetrix verify that AD8643ARZ is sourced from the original manufacturer or authorized distributors?
All AD8643ARZ 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 AD8643ARZ meets industry standards.
7.What is the process for return or replacement of AD8643ARZ?
All AD8643ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8643ARZ, 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 AD8643ARZ part is unused and in its original packaging.
Return procedure for AD8643ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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