Part A
AD8542AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3683 PCS
- Package
- MSOP-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8542ARMZ and AD8542AR are functionally compatible CMOS operational amplifiers sharing the same core dual op-amp architecture, supply range, and electrical performance. The primary distinction is package and packaging format: the AD8542ARMZ is supplied in an 8-lead MSOP (RM suffix) in tube format, while the AD8542AR is supplied in an 8-lead SOIC (R suffix) in tube format. Both are rated for the extended industrial temperature range and are suitable for drop-in functional substitution where board footprint and assembly process permit the package change.
Amplifier Core Specifications
High match
Supply Voltage Range
High match
Package Type
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
AD8542ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6454 PCS
- Package
- MSOP-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 | AD8542ARMZ | AD8542AR | Why it matters |
|---|---|---|---|
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-SOIC (0.154", 3.90mm Width) | Footprint and land pattern differ, so the two parts are not drop-in replacements on the same PCB. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount, but the package body size affects board space and assembly. |
| Supplier Device Package | 8-MSOP | 8-SOIC | Different package codes mean different reflow profiles and stencil designs. |
| Amplifier Type | General Purpose | General Purpose | Both are general-purpose CMOS op-amps, so the electrical function is equivalent. |
| Number of Circuits | 2 | 2 | Both are dual op-amps, matching channel count for the same circuit topology. |
| Output Type | Rail-to-Rail | Rail-to-Rail | Rail-to-rail output supports full supply swing, important for low-voltage signal chains. |
| Slew Rate | 0.92 V/µs | 0.92 V/µs | Identical slew rate means the same dynamic response and settling behavior. |
| Gain Bandwidth Product | 1 MHz | 1 MHz | Same GBW ensures equivalent small-signal bandwidth for filter and buffer designs. |
| Input Offset Voltage | 1 mV | 1 mV | Matching offset voltage keeps DC accuracy consistent between the two parts. |
| Operating Temperature Range | -40°C to 125°C | -40°C to 125°C | Same temperature range supports identical thermal derating and reliability margins. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8542AR | AD8542ARMZ |
|---|---|---|
| Part Status | Obsolete | Active |
| 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 are the key differences between the AD8542ARMZ and the AD8542AR?
The AD8542ARMZ and AD8542AR are both dual, rail-to-rail input/output CMOS operational amplifiers from Analog Devices. The primary difference is the package and packaging option: the AD8542ARMZ is supplied in an 8-lead MSOP (Mini Small Outline Package) and is RoHS-compliant, while the AD8542AR is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package. Both share the same electrical core specifications, including a 1 MHz gain bandwidth product and a 45 µA per amplifier supply current.
Are the AD8542ARMZ and AD8542AR electrically interchangeable?
Yes, from an electrical standpoint the two devices share the same datasheet specifications: dual CMOS op amp, 2.7 V to 5.5 V single-supply operation, rail-to-rail input and output, 1 MHz gain bandwidth, and 45 µA typical supply current per amplifier. The functional difference is package footprint, so electrical interchangeability does not imply board-level drop-in compatibility.
Can the AD8542ARMZ be used as a direct drop-in replacement for the AD8542AR on an existing PCB?
No, not without a board redesign. The AD8542ARMZ uses an 8-lead MSOP package, while the AD8542AR uses an 8-lead SOIC package. These packages have different body dimensions, lead pitch, and PCB land patterns, so the MSOP device cannot be soldered directly onto a SOIC footprint. A layout change or package adapter is required.
What is the difference in package type and RoHS status between the two parts?
The AD8542ARMZ is offered in an 8-lead MSOP package and the "Z" suffix denotes RoHS-compliant, lead-free construction. The AD8542AR is offered in an 8-lead SOIC package; the standard AD8542AR is the non-Z (non-RoHS) ordering option. Designers requiring lead-free/RoHS compliance should confirm the exact orderable part number with the manufacturer or authorized distributor.
Do both parts share the same supply voltage range and quiescent current?
Yes. Per the Analog Devices AD8541/AD8542/AD8544 datasheet family, both the AD8542ARMZ and AD8542AR operate from a single supply of 2.7 V to 5.5 V and draw a typical supply current of 45 µA per amplifier. These core electrical parameters are common to the AD8542 die regardless of package.
Which package should be selected for space-constrained designs?
The AD8542ARMZ in the 8-lead MSOP is the smaller package option and is generally preferred for space-constrained PCB layouts. The AD8542AR in the 8-lead SOIC occupies a larger board area but may be preferred where SOIC handling, inspection, or existing footprint compatibility is required.
Are both parts specified over the same operating temperature range?
Yes. The AD8542 family is specified for the industrial temperature range of −40 °C to +125 °C. This specification applies to the AD8542 die and is documented in the Analog Devices AD8541/AD8542/AD8544 datasheet for both the MSOP (RM) and SOIC (R) package options.