Part A
AD8629ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2962 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8629ARZ and AD8627AR-REEL are both zero-drift, single-supply operational amplifiers from Analog Devices in the same 8-lead SOIC package, sharing identical pinout and comparable supply voltage ranges. However, the AD8629ARZ is a dual-channel device while the AD8627AR-REEL is a single-channel device, and their bandwidth, supply current, and noise characteristics differ. The AD8629ARZ can serve as a functional substitute for the AD8627AR-REEL in applications where the second channel is unused or where board space permits, but designers must validate gain-bandwidth, quiescent current, and noise performance against the target circuit requirements before committing to a drop-in replacement.
Channel Count
Validation required
Package Type
High match
Gain Bandwidth Product
Validation required
Supply Current
Validation required
Parts at a glance
Part B
AD8627AR-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9523 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8629ARZ | AD8627AR-REEL | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (Dual) | 1 (Single) | Channel count determines whether the part can serve multi-channel signal chains; a dual cannot directly replace a single without layout changes. |
| Input Offset Voltage (Max) | 5 µV | 250 µV | Lower offset improves DC precision; the AD8629 is a zero-drift part suited to high-accuracy sensing, while the AD8627 has larger offset. |
| Input Offset Voltage Drift (Max) | 0.02 µV/°C | 1.5 µV/°C | Drift affects accuracy over temperature; the AD8629's near-zero drift is critical for precision instrumentation over wide temperature ranges. |
| Gain Bandwidth Product | 2.5 MHz | 5 MHz | GBW sets the achievable closed-loop bandwidth; the AD8627 offers higher speed for wider-bandwidth signal conditioning. |
| Input Bias Current (Typ) | 30 pA | 0.25 pA | Very low bias current is essential for high-impedance sensors; the AD8627's JFET input provides even lower bias current. |
| Supply Current per Amplifier (Typ) | 0.85 mA | 0.7 mA | Quiescent current impacts power budget in portable and battery-powered designs. |
| Input Voltage Noise Density (Typ) | 22 nV/√Hz | 16 nV/√Hz | Lower voltage noise improves SNR in low-level signal amplification; the AD8627 has slightly lower noise density. |
| Package / Pin Count | 8-Lead SOIC | 8-Lead SOIC | Same package footprint aids board-level compatibility, though pinout differs between single and dual configurations. |
| Supply Voltage Range | 2.7 V to 5 V (single) / ±1.35 V to ±2.5 V (dual) | 5 V to 26 V (single) / ±2.5 V to ±13 V (dual) | Operating voltage range determines system compatibility; the AD8627 supports much higher supply voltages than the AD8629. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8629ARZ | AD8627AR-REEL |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | Zero-Drift | J-FET |
| Number of Circuits | 2 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 1V/µs | 5V/µs |
| Gain Bandwidth Product | 2.5 MHz | 5 MHz |
| Current - Input Bias | 30 pA | 0.25 pA |
| Voltage - Input Offset | 1 µV | 350 µV |
| Supply Current | - | 710µA |
| Current - Output / Channel | 30 mA | 15 mA |
| Voltage - Supply Span(Min) | 2.7 V | 5 V |
| Voltage - Supply Span(Max) | 5 V | 26 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| -3 dB Bandwidth | 2.5 MHz | - |
Frequently asked questions
What are the key differences between the AD8629ARZ and AD8627AR-REEL?
The AD8629ARZ is a dual, zero-drift, rail-to-rail input/output operational amplifier in an 8-lead SOIC package, while the AD8627AR-REEL is a single, low-power, precision JFET-input op amp in an 8-lead SOIC package supplied on tape and reel. The AD8629 offers two amplifiers per package with chopper-stabilized zero-drift performance, whereas the AD8627 provides one JFET-input amplifier optimized for low input bias current and low noise.
Are the AD8629ARZ and AD8627AR-REEL pin-compatible?
No. Although both devices are offered in 8-lead SOIC packages, their pinouts differ because the AD8629 is a dual op amp and the AD8627 is a single op amp. The pin functions and internal connections are not interchangeable, so the PCB layout must be designed specifically for each device.
What is the input offset voltage performance of the AD8629ARZ?
The AD8629ARZ is a zero-drift amplifier with very low input offset voltage, specified in the microvolt range, and extremely low offset voltage drift over temperature. This makes it suitable for precision DC and low-frequency applications where offset stability is critical. Exact limits should be confirmed on the official Analog Devices datasheet.
What input characteristics distinguish the AD8627AR-REEL?
The AD8627AR-REEL uses a JFET input stage, providing very low input bias current and low input current noise, which suits high-impedance sensor and precision signal-conditioning applications. Its single-amplifier configuration and low power consumption make it appropriate for portable and space-constrained designs.
Can the AD8629ARZ and AD8627AR-REEL be used interchangeably in an existing design?
No. They differ in amplifier count (dual versus single), input stage technology (zero-drift CMOS versus JFET), pinout, and packaging format. Substitution requires verifying supply voltage range, gain bandwidth, offset, noise, and pin functions against the manufacturer datasheets and validating the target circuit.
What supply voltage ranges do these amplifiers support?
Both the AD8629ARZ and AD8627AR-REEL are specified for operation on single-supply or dual-supply configurations within their datasheet-rated ranges, typically covering low-voltage operation suitable for battery-powered and precision analog systems. Confirm the exact minimum and maximum supply voltages on the respective Analog Devices datasheets before design use.
Why is the AD8627AR-REEL supplied in tape and reel format?
The "-REEL" suffix indicates the AD8627AR-REEL is packaged on tape and reel for automated high-volume SMT assembly. The AD8629ARZ is supplied in standard tube or tray packaging unless a reel-specific ordering code is selected. Packaging format affects assembly handling but not the electrical specifications of the device.