Part A
AD8542AR
ADI公司
- Lifecycle
- Active
- Stock
- 3683 件
- Package
- MSOP-8
- Series
- 線性放大器-儀器、運算放大器、緩衝放大器
Replacement verdict
Compatible functional replacement candidate
The AD8542AR and AD8542ARU are functionally compatible CMOS operational amplifiers sharing identical core electrical characteristics, including dual channel configuration, rail-to-rail input/output, 1 MHz gain bandwidth, and 2.7 V to 5.5 V supply range. The primary distinction is package type: the AD8542AR uses an 8-lead SOIC while the AD8542ARU uses an 8-lead MSOP, making them suitable substitutes where board footprint and assembly tolerances permit package substitution.
Amplifier Configuration
High match
Supply Voltage Range
High match
Package Type
Not compatible
Operating Temperature Range
High match
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8542AR | AD8542ARU | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 2 | Both are dual op-amps, so channel count matches for direct functional substitution. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Identical supply range ensures the part works in the same rail conditions. |
| Gain Bandwidth Product | 1 MHz | 1 MHz | Same bandwidth means AC performance and stability behavior are equivalent. |
| Input Offset Voltage (max) | 6 mV | 6 mV | Matching offset voltage keeps DC accuracy consistent between the two parts. |
| Input Bias Current | 1 pA (typ) | 1 pA (typ) | Very low bias current suits high-impedance sensor interfaces in both variants. |
| Quiescent Current per Amplifier | 45 µA (typ) | 45 µA (typ) | Equal quiescent current preserves power budget in battery-powered designs. |
| Slew Rate | 0.92 V/µs | 0.92 V/µs | Same slew rate maintains transient response and large-signal behavior. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead TSSOP (surface mount) | Different package footprints require PCB layout changes, so they are not drop-in replacements. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature range supports the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8542AR | AD8542ARU |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| Amplifier Type | General Purpose | General Purpose |
| Number of Circuits | 2 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 0.92V/µs | 0.92V/µs |
| Gain Bandwidth Product | 1 MHz | 1 MHz |
| Current - Input Bias | 4 pA | 4 pA |
| Voltage - Input Offset | 1 mV | 1 mV |
| Supply Current | 45µA (x2 Channels) | 45µA (x2 Channels) |
| Current - Output / Channel | 30 mA | 30 mA |
| Voltage - Supply Span(Min) | 2.7 V | 2.7 V |
| Voltage - Supply Span(Max) | 5.5 V | 5.5 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between the AD8542AR and AD8542ARU?
The AD8542AR and AD8542ARU are both dual, rail-to-rail input/output CMOS operational amplifiers from Analog Devices. The primary difference is the package: the AD8542AR is supplied in an 8-lead SOIC (R-8) package, while the AD8542ARU is supplied in an 8-lead TSSOP (RU-8) package. The electrical specifications are otherwise the same.
Are the AD8542AR and AD8542ARU electrically identical?
Yes. Both variants share the same datasheet specifications, including a 1 MHz gain bandwidth product, 0.92 V/µs slew rate, rail-to-rail input and output, and operation from a 2.7 V to 5.5 V single supply. The only documented difference is the package type.
Can the AD8542AR and AD8542ARU be used interchangeably in a design?
They are electrically interchangeable, but not footprint-compatible. The SOIC (AD8542AR) and TSSOP (AD8542ARU) packages have different body dimensions and lead pitches, so the PCB land pattern must match the selected package. A board designed for one package cannot accept the other without layout changes.
What are the package dimensions of the AD8542AR and AD8542ARU?
The AD8542AR uses an 8-lead SOIC package with a 1.27 mm lead pitch and a nominal body width of 3.90 mm. The AD8542ARU uses an 8-lead TSSOP package with a 0.65 mm lead pitch and a nominal body width of 4.40 mm. Designers should confirm exact dimensions against the Analog Devices datasheet before finalizing footprints.
Do both parts share the same pinout?
Yes. Both the 8-lead SOIC and 8-lead TSSOP versions of the AD8542 use the standard dual op-amp pinout: pin 1 = OUT A, pin 2 = -IN A, pin 3 = +IN A, pin 4 = V-, pin 5 = +IN B, pin 6 = -IN B, pin 7 = OUT B, and pin 8 = V+. The pin functions are identical; only the physical package differs.
What supply voltage range do the AD8542AR and AD8542ARU support?
Both variants operate from a single supply of 2.7 V to 5.5 V, and they can also be operated from dual supplies within that total range. They are specified for rail-to-rail input and output, making them suitable for low-voltage signal conditioning applications.
Which package should be selected for a space-constrained design?
The AD8542ARU in the 8-lead TSSOP package offers a smaller footprint and 0.65 mm lead pitch, which is generally preferred for space-constrained boards. The AD8542AR in SOIC is easier to handle and inspect and is often chosen for prototyping or applications where board area is less critical.
Are the AD8542AR and AD8542ARU rated for the same temperature range?
Both variants are specified over the industrial temperature range of -40°C to +125°C per the Analog Devices datasheet. The package difference does not change the rated operating temperature range.