Part A
AD8634HRZN
テキサス・インスツルメンツ
- Lifecycle
- Active
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- 1257 個数
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- Linear - Amplifiers - Instrumentation, Op Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8630ARZ and AD8634HRZN are both zero-drift, rail-to-rail operational amplifiers sharing the same SOIC-8 footprint and comparable supply voltage range, making the AD8634HRZN a viable functional candidate for the AD8630ARZ in many precision signal-conditioning designs. However, the AD8634HRZN is specified for extended high-temperature operation with somewhat higher quiescent current and slightly different bandwidth and noise characteristics, so the designer must validate thermal margin, dynamic performance, and power budget before committing to a drop-in substitution.
Package Type
High match
Supply Voltage Range
High match
Operating Temperature Range
Validation required
Quiescent Current
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8630ARZ | AD8634HRZN | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 4 (Quad) | 2 (Dual) | Channel count determines how many independent signal paths can be processed in one package; a quad cannot be directly substituted by a dual without redesigning the circuit. |
| Input Offset Voltage (Max) | 5 µV | 25 µV | Lower offset voltage improves DC precision; the AD8630 offers tighter offset, which matters for high-accuracy sensor and instrumentation front ends. |
| Input Offset Voltage Drift (Max) | 0.03 µV/°C | 0.1 µV/°C | Drift determines offset stability over temperature; lower drift is critical for precision applications operating across wide temperature ranges. |
| Gain Bandwidth Product | 2.5 MHz | 5 MHz | GBW sets the achievable closed-loop bandwidth and settling behavior; the AD8634 supports higher-frequency signals than the AD8630. |
| Supply Voltage Range | 2.7 V to 5.5 V (single) | 3 V to 30 V (single/dual) | The wider supply range of the AD8634 allows operation on higher-voltage rails, while the AD8630 is limited to low-voltage single-supply systems. |
| Input Voltage Noise Density | 22 nV/√Hz | 11 nV/√Hz | Lower noise density improves signal-to-noise ratio in low-level signal amplification; the AD8634 is roughly half as noisy as the AD8630. |
| Quiescent Current per Amplifier (Typ) | 0.9 mA | 1.3 mA | Quiescent current affects power budget; the AD8630 draws less per amplifier, which matters for battery-powered and low-power designs. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +175 °C | The extended high-temperature rating of the AD8634 suits harsh environments such as automotive and industrial applications where the AD8630 may not be rated. |
| Package | 8-Lead SOIC | 8-Lead SOIC (with exposed pad) | Package footprint and thermal characteristics affect PCB layout and heat dissipation; the exposed pad on the AD8634 aids thermal performance. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8634HRZN | AD8630ARZ |
|---|---|---|
| Part Status | Discontinued at DigiKey | Active |
| Base Product Number | AD8634 | - |
| Amplifier Type | Standard (General Purpose) | Zero-Drift |
| Number of Circuits | 2 | 4 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 4.9V/µs | 1V/µs |
| Gain Bandwidth Product | 9.7 MHz | 2.5 MHz |
| Current - Input Bias | 45 nA | 30 pA |
| Voltage - Input Offset | 250 µV | 1 µV |
| Supply Current | 1.1mA (x2 Channels) | - |
| Voltage - Supply Span (Min) | 3 V | - |
| Voltage - Supply Span (Max) | 30 V | - |
| Operating Temperature | -40°C ~ 175°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Packaging | Tube | - |
| -3 dB Bandwidth | 11 MHz | 2.5 MHz |
| Current - Output / Channel | 65 mA | 30 mA |
| Voltage - Supply Span(Min) | - | 2.7 V |
| Voltage - Supply Span(Max) | - | 5 V |
Frequently asked questions
What are the primary differences between the AD8630ARZ and AD8634HRZN?
The AD8630ARZ is a quad, zero-drift, rail-to-rail operational amplifier in a 14-lead SOIC package, specified over the −40°C to +125°C industrial temperature range. The AD8634HRZN is a dual, zero-drift, rail-to-rail operational amplifier in an 8-lead SOIC package, specified over the −40°C to +175°C extended temperature range. The key differences are channel count (quad vs. dual), package pin count (14 vs. 8), and the higher specified operating temperature of the AD8634HRZN.
Are the AD8630ARZ and AD8634HRZN pin-compatible or directly interchangeable?
No. The AD8630ARZ is a 14-lead SOIC quad device, while the AD8634HRZN is an 8-lead SOIC dual device. They differ in package size, pin count, and pin functions, so they cannot be directly substituted without a PCB redesign and validation against the manufacturer datasheets.
What are the supply voltage and input offset voltage specifications for these amplifiers?
Both the AD8630ARZ and AD8634HRZN operate from a single supply of 2.7 V to 5 V (or dual supplies of ±1.35 V to ±2.5 V). Both are zero-drift amplifiers with very low input offset voltage, typically in the microvolt range as specified in the respective Analog Devices datasheets. Consult the official datasheets for the exact offset voltage limits and drift specifications.
How do the temperature ranges of the AD8630ARZ and AD8634HRZN compare?
The AD8630ARZ is specified over the −40°C to +125°C industrial temperature range. The AD8634HRZN is specified over the −40°C to +175°C extended temperature range, making it suitable for higher-temperature applications where the AD8630ARZ would not be qualified.
What are the input and output characteristics of these zero-drift amplifiers?
Both the AD8630ARZ and AD8634HRZN feature rail-to-rail input and output (RRIO) capability, allowing operation with input signals and output swings close to both supply rails. They are zero-drift amplifiers designed for low offset voltage and low offset voltage drift, making them suitable for precision, low-frequency signal conditioning. Refer to the Analog Devices datasheets for exact input common-mode range and output swing limits.
Which applications are better suited to the AD8634HRZN versus the AD8630ARZ?
The AD8634HRZN, with its −40°C to +175°C rating and dual-channel configuration, is better suited to high-temperature, space-constrained applications requiring two precision zero-drift amplifiers. The AD8630ARZ, a quad device rated to +125°C, is better suited to applications needing four precision amplifiers in a single package within standard industrial temperature ranges. Selection should be based on channel count, package size, and the required operating temperature range.
Do both parts share the same zero-drift amplifier architecture and precision characteristics?
Yes. Both the AD8630ARZ and AD8634HRZN are Analog Devices zero-drift, rail-to-rail operational amplifiers belonging to the same precision amplifier family, sharing low offset voltage, low drift, and low noise characteristics. However, because they are different part numbers with different channel counts and temperature ratings, designers should verify all electrical parameters against the individual datasheets before finalizing a design.