Part A
AD8629ARMZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3786 PCS
- Package
- TSSOP-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8629ARMZ and AD8626ARM-R2 are both dual, low-power, precision operational amplifiers in the same 8-lead MSOP package, making the AD8629ARMZ a viable functional replacement candidate for the AD8626ARM-R2 in many designs. However, the two parts differ in their input voltage noise density and gain-bandwidth product, so the AD8629ARMZ should be validated against application-specific noise and bandwidth requirements before substitution.
Package Type
High match
Channel Count
High match
Input Voltage Noise Density
Validation required
Gain-Bandwidth Product
Validation required
Parts at a glance
Part B
AD8626ARM-R2
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2661 PCS
- Package
- TSSOP-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8629ARMZ | AD8626ARM-R2 | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (Dual) | 2 (Dual) | Both are dual op-amps, so channel count is compatible for direct substitution in dual-channel circuits. |
| Input Offset Voltage (Max) | 5 µV | 250 µV | AD8629 is a precision zero-drift amplifier with far lower offset, critical for high-accuracy DC signal chains where AD8626 may introduce larger errors. |
| Input Offset Voltage Drift (Typ) | 0.005 µV/°C | 1 µV/°C | Zero-drift architecture of AD8629 gives dramatically better temperature stability, important for precision instrumentation over temperature. |
| Gain Bandwidth Product | 2.5 MHz | 5 MHz | AD8626 offers higher bandwidth, so it can support faster signal paths; AD8629 trades bandwidth for precision. |
| Input Bias Current (Typ) | 30 pA | 1 pA | Both are CMOS/JFET-input with very low bias current; AD8626 is slightly lower, relevant for high-impedance sensor interfaces. |
| 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) | AD8626 supports much higher supply voltages, so it is not a drop-in replacement in high-voltage rails; AD8629 is limited to low-voltage systems. |
| Quiescent Current per Amplifier (Typ) | 0.85 mA | 0.9 mA | Similar quiescent current, so power budget impact is comparable between the two parts. |
| Input Voltage Noise Density (Typ) | 22 nV/√Hz | 18 nV/√Hz | AD8626 has slightly lower voltage noise, beneficial for low-noise signal amplification; both are relatively low-noise CMOS amplifiers. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | AD8629 is rated for a wider temperature range, making it suitable for harsher environments where AD8626 is limited to +85 °C. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Identical package and pinout allow physical board compatibility, though electrical differences must still be evaluated. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8629ARMZ | AD8626ARM-R2 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | Zero-Drift | J-FET |
| Number of Circuits | 2 | 2 |
| 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 (x2 Channels) |
| 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 AD8629ARMZ and AD8626ARM-R2?
The AD8629ARMZ is a dual zero-drift, rail-to-rail operational amplifier in an 8-lead MSOP package, while the AD8626ARM-R2 is a dual precision JFET-input op amp in an 8-lead MSOP package supplied on a 2,000-piece reel. The AD8629 uses auto-zero correction for very low offset voltage and drift, whereas the AD8626 uses a JFET input stage for high input impedance and low input bias current.
Are the AD8629ARMZ and AD8626ARM-R2 pin-compatible in the MSOP-8 package?
Both devices are offered in an 8-lead MSOP (RM) package, but pin compatibility must be confirmed against the respective manufacturer datasheets, since pin assignments and internal circuit configurations can differ between the two amplifier families.
Which device is better suited for low offset voltage and drift applications?
The AD8629ARMZ is a zero-drift amplifier designed for very low offset voltage and offset voltage drift, making it preferable for precision DC applications where offset stability is critical. The AD8626 is a JFET-input amplifier optimized for high input impedance and low input bias current rather than zero-drift offset performance.
Which device offers lower input bias current?
The AD8626ARM-R2, with its JFET input stage, is designed for low input bias current and high input impedance, making it suitable for high-impedance sensor and buffer applications. The AD8629, using auto-zero CMOS architecture, has different input bias current characteristics that should be verified from its datasheet for the specific operating conditions.
What is the difference in packaging and ordering between the two part numbers?
The AD8629ARMZ is supplied in an 8-lead MSOP tube or standard packaging format, while the AD8626ARM-R2 suffix indicates tape-and-reel packaging with a 2,000-piece reel quantity. Designers should confirm the exact packaging and order quantity from the manufacturer or authorized distributor before production planning.
Can the AD8629ARMZ be used as a drop-in replacement for the AD8626ARM-R2?
A direct drop-in replacement should not be assumed. Although both are dual op amps in 8-lead MSOP packages, their input architectures, offset characteristics, bias current behavior, and dynamic performance differ. Any substitution must be validated against both datasheets and the target circuit requirements.
Which device is more appropriate for high-impedance sensor interfacing?
The AD8626ARM-R2, with its JFET input stage providing high input impedance and low input bias current, is generally more appropriate for high-impedance sensor interfacing. The AD8629 is optimized for precision low-offset, low-drift signal conditioning and should be evaluated against the source impedance requirements of the application.