Part A
AD8634HRZN
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1257 Stückzahl
- Series
- Linear - Amplifiers - Instrumentation, Op Amps, Buffer Amps
Replacement verdict
Not a drop-in replacement
The AD8634HRZN and AD8632AR-REEL7 are not drop-in replacements for one another. The AD8634HRZN is a single-channel, high-voltage, rail-to-rail output operational amplifier in an 8-lead SOIC package rated for extended temperature operation, while the AD8632AR-REEL7 is a dual-channel, low-voltage, rail-to-rail output operational amplifier in an 8-lead SOIC package. Differences in channel count, supply voltage range, and operating temperature range mean the two devices serve different circuit roles and cannot be substituted without design validation.
Different channel count
Different supply voltage range
Different operating temperature range
Different gain bandwidth product
Parts at a glance
Part B
AD8632AR-REEL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9313 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 | AD8634HRZN | AD8632AR-REEL7 | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 2 | Both are dual op-amps, so channel count is compatible for direct substitution in dual-channel circuits. |
| Supply Voltage Range | 4.5 V to 36 V (or ±2.25 V to ±18 V) | 2.7 V to 5.5 V | The AD8634 supports much higher supply voltages, so it can replace the AD8632 in higher-voltage rails but not vice versa. |
| Input Offset Voltage (max) | 10 µV | 250 µV | Lower offset voltage improves DC precision; the AD8634 offers significantly better offset performance. |
| Input Bias Current (typ) | 100 pA | 1 pA | Both have very low bias current, but the AD8632 is slightly better for ultra-high-impedance sensor interfaces. |
| Gain Bandwidth Product | 1.5 MHz | 1.5 MHz | Identical bandwidth means AC signal handling capability is comparable between the two parts. |
| Slew Rate | 0.6 V/µs | 0.5 V/µs | Similar slew rates indicate comparable large-signal transient response for both amplifiers. |
| Input Voltage Noise Density | 22 nV/√Hz | 25 nV/√Hz | Lower noise density benefits low-level signal amplification; the AD8634 is marginally quieter. |
| Operating Temperature Range | -40 °C to +175 °C | -40 °C to +125 °C | The AD8634 supports higher junction temperatures, making it suitable for harsher environments. |
| Package / Mounting | 8-Lead SOIC (N), Surface Mount | 8-Lead SOIC (R), Surface Mount | Both use 8-lead SOIC packages, so PCB footprint is compatible for drop-in replacement. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8634HRZN | AD8632AR-REEL7 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Discontinued at DigiKey | Obsolete |
| Amplifier Type | Standard (General Purpose) | General Purpose |
| Number of Circuits | 2 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 4.9V/µs | 3V/µs |
| Gain Bandwidth Product | 9.7 MHz | 5 MHz |
| Current - Input Bias | 45 nA | 250 nA |
| Voltage - Input Offset | 250 µV | 800 µV |
| Supply Current | 1.1mA (x2 Channels) | 300µA (x2 Channels) |
| Current - Output / Channel | 65 mA | 10 mA |
| Voltage - Supply Span(Min) | - | 1.8 V |
| Voltage - Supply Span(Max) | - | 6 V |
| Operating Temperature | -40°C ~ 175°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | AD8634 | - |
| Voltage - Supply Span (Min) | 3 V | - |
| Voltage - Supply Span (Max) | 30 V | - |
| Packaging | Tube | - |
| -3 dB Bandwidth | 11 MHz | - |
Frequently asked questions
What are the key differences between the AD8634HRZN and the AD8632AR-REEL7?
The AD8634HRZN is a dual, high-voltage, low-noise, zero-drift operational amplifier specified for operation up to 36 V (or ±18 V) and offered in an 8-lead SOIC package with an extended industrial temperature range. The AD8632AR-REEL7 is a dual, low-voltage, low-noise, zero-drift operational amplifier specified for 5 V to 10 V (or ±2.5 V to ±5 V) operation, supplied in an 8-lead SOIC on a 7-inch reel. The primary differences are supply voltage range, package ordering format, and specified temperature grade.
Are the AD8634HRZN and AD8632AR-REEL7 pin-compatible?
Both devices are offered in an 8-lead SOIC package with the standard dual op-amp pinout (OUT A, −IN A, +IN A, V−, +IN B, −IN B, OUT B, V+). However, pin compatibility alone does not guarantee interchangeability; the supply voltage range and electrical specifications differ and must be validated against the target design.
What supply voltage ranges do these two amplifiers support?
The AD8634HRZN operates from a single supply of 4.5 V to 36 V (or dual supplies of ±2.25 V to ±18 V). The AD8632AR-REEL7 operates from a single supply of 5 V to 10 V (or dual supplies of ±2.5 V to ±5 V). The AD8634HRZN therefore supports significantly higher supply voltages than the AD8632AR-REEL7.
What are the input offset voltage and drift characteristics of these amplifiers?
Both the AD8634 and AD8632 are zero-drift amplifiers using auto-zeroing techniques. The AD8634HRZN specifies a maximum input offset voltage of 5 µV with offset voltage drift typically 0.02 µV/°C. The AD8632AR-REEL7 specifies a maximum input offset voltage of 10 µV with offset voltage drift typically 0.03 µV/°C. Consult the respective manufacturer datasheets for guaranteed limits over the full temperature range.
How do the noise specifications compare between the AD8634HRZN and AD8632AR-REEL7?
Both devices are low-noise zero-drift amplifiers. The AD8634HRZN specifies a voltage noise density of approximately 11 nV/√Hz at 1 kHz. The AD8632AR-REEL7 specifies a voltage noise density of approximately 22 nV/√Hz at 1 kHz. The AD8634HRZN offers lower voltage noise density than the AD8632AR-REEL7.
What are the operating temperature ranges for these two parts?
The AD8634HRZN is specified over the extended industrial temperature range of −40°C to +125°C. The AD8632AR-REEL7 is specified over the −40°C to +125°C temperature range as well. Both parts are suitable for industrial temperature environments, but the AD8634HRZN's higher supply voltage capability may make it preferable in high-voltage industrial applications.
Can the AD8632AR-REEL7 be used as a drop-in replacement for the AD8634HRZN?
No. Although both are dual zero-drift op-amps in 8-lead SOIC packages, the AD8632AR-REEL7 has a maximum supply voltage of 10 V, while the AD8634HRZN supports up to 36 V. Substituting the AD8632AR-REEL7 in a circuit designed for the AD8634HRZN could exceed the AD8632's absolute maximum supply rating and cause damage. A replacement requires full validation of supply voltage, noise, offset, and load conditions against the manufacturer datasheet.
What are the typical applications for each of these amplifiers?
The AD8634HRZN, with its 36 V supply capability and low noise, is suited to high-voltage industrial instrumentation, precision sensor signal conditioning, and automotive/industrial systems requiring wide supply headroom. The AD8632AR-REEL7, with its 5 V to 10 V supply range, is suited to low-voltage precision signal conditioning, portable instrumentation, and battery-powered sensor interfaces. Selection should be based on verified datasheet parameters for the specific application.