Part A
AD8542ARUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7540 PCS
- Series
- Linear - Amplifiers - Instrumentation, Op Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8542ARUZ and AD8544ARU are both CMOS operational amplifiers from the same AD854x family, sharing identical supply voltage range, rail-to-rail input/output behavior, and TSSOP packaging. The primary distinction is channel count: the AD8542ARUZ is a dual-channel device while the AD8544ARU is a quad-channel device. For designs requiring fewer channels, the AD8542ARUZ can serve as a functional substitute where board space and channel count permit, but the difference in channel count and pin configuration must be validated against the target application before substitution.
Amplifier Type
High match
Supply Voltage Range
High match
Channel Count
Not compatible
Package and Pinout
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 | AD8542ARUZ | AD8544ARU | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 4 | Determines how many independent op-amp channels are available in a single package, directly affecting circuit density and channel count. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines the operating supply window; matching ranges ensure the parts can be used in the same power rail conditions. |
| Input Offset Voltage (max) | 6 mV | 6 mV | Sets the worst-case DC error at the input; identical values mean comparable precision in DC signal chains. |
| Gain Bandwidth Product | 1 MHz | 1 MHz | Determines the frequency range over which the amplifier provides useful gain; matching values support equivalent AC performance. |
| Input Bias Current (typ) | 1 pA | 1 pA | Low bias current is critical for high-impedance sensor interfaces; identical values preserve input loading behavior. |
| Quiescent Current per Amplifier (typ) | 45 µA | 45 µA | Affects total power consumption; per-amplifier matching allows predictable power budgeting when channel count changes. |
| Rail-to-Rail Input/Output | Yes | Yes | Enables full use of the supply range for both input and output swing, important for low-voltage single-supply designs. |
| Package | 8-Lead TSSOP | 14-Lead TSSOP | Footprint and pin count differ, so PCB layout and board space must be redesigned when substituting between the two parts. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Confirms both parts are rated for the same environmental conditions, supporting use in industrial and automotive applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8542ARUZ | AD8544ARU |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Amplifier Type | Standard (General Purpose) | General Purpose |
| Number of Circuits | 2 | 4 |
| 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 (x4 Channels) |
| Current - Output / Channel | 30 mA | 30 mA |
| Voltage - Supply Span(Min) | - | 2.7 V |
| Voltage - Supply Span(Max) | - | 5.5 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | AD8542 | - |
| Voltage - Supply Span (Min) | 2.7 V | - |
| Voltage - Supply Span (Max) | 5.5 V | - |
| Packaging | Tube | - |
Frequently asked questions
What are the key differences between the AD8542ARUZ and AD8544ARU?
The AD8542ARUZ is a dual operational amplifier, while the AD8544ARU is a quad operational amplifier. Both are single-supply, rail-to-rail input/output CMOS op amps from Analog Devices. The AD8542ARUZ is supplied in an 8-lead TSSOP package, and the AD8544ARU is supplied in a 14-lead TSSOP package. The channel count and package pin count are the primary differences.
Are the AD8542ARUZ and AD8544ARU electrically identical on a per-channel basis?
Yes. Both devices share the same per-channel core specifications, including a typical gain bandwidth product of 1 MHz, a typical slew rate of 0.92 V/µs, rail-to-rail input and output swing, and operation from a single supply of 2.7 V to 5.5 V. The AD8544ARU simply integrates four channels in one package versus two channels in the AD8542ARUZ.
Can the AD8542ARUZ be used as a drop-in replacement for the AD8544ARU?
No. The AD8542ARUZ is a dual device in an 8-lead TSSOP, while the AD8544ARU is a quad device in a 14-lead TSSOP. The package footprint, pin count, and pin functions differ, so a direct PCB drop-in replacement is not possible. A redesign of the board layout would be required.
What supply voltage range do the AD8542ARUZ and AD8544ARU support?
Both devices operate from a single supply voltage of 2.7 V to 5.5 V, making them suitable for low-voltage, battery-powered, and single-supply systems. They are specified for operation over the extended industrial temperature range of −40°C to +125°C.
What are the input and output characteristics of these op amps?
Both the AD8542ARUZ and AD8544ARU feature rail-to-rail input and output capability, allowing signal swing close to both supply rails. They have a typical input bias current of 1 pA and a typical input offset voltage of 1 mV, which supports high-impedance sensor interfacing and low-power signal conditioning.
Which package types are used for the AD8542ARUZ and AD8544ARU?
The AD8542ARUZ is offered in an 8-lead TSSOP package, and the AD8544ARU is offered in a 14-lead TSSOP package. Both are surface-mount packages suitable for space-constrained PCB designs. Designers should verify the exact package suffix against the manufacturer datasheet before layout.
Are the AD8542ARUZ and AD8544ARU suitable for low-power applications?
Yes. Both devices are CMOS operational amplifiers with low quiescent current, typically 45 µA per amplifier, making them well suited for portable and battery-operated equipment. The AD8542ARUZ provides two channels and the AD8544ARU provides four channels, so total package current scales with the number of amplifiers used.