AD8042AR Equivalent & Substitute Parts

Part Overview

The AD8042AR is a voltage feedback amplifier manufactured by Analog Devices Inc., featuring two circuits in a rail-to-rail configuration housed in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production requirements. The AD8042AR operates across a supply voltage range of 3V to 12V with a slew rate of 225V/µs and gain bandwidth product of 90 MHz, making it suitable for general-purpose amplification applications requiring moderate bandwidth and rail-to-rail output capability.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	2	—
Output Type	Rail-to-Rail	—
Slew Rate	225	V/µs
Gain Bandwidth Product	90	MHz
-3dB Bandwidth	170	MHz
Current - Input Bias	1.2	µA
Voltage - Input Offset	3	mV
Current - Supply (per 2 Channels)	6	mA
Current - Output / Channel	50	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	12	V
Operating Temperature	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the AD8042AR is determined by alignment across the following critical parameters: amplifier type (voltage feedback), number of circuits (2), output type (rail-to-rail), package type (8-SOIC), mounting method (surface mount), and operating temperature range (-40°C to 85°C). Secondary parameters including slew rate, gain bandwidth product, bandwidth, input bias current, input offset voltage, supply current, output current capability, and supply voltage range define the degree of functional equivalence.

Substitute parts are grouped into two categories:

Direct Equivalent: Parts that maintain identical or near-identical electrical specifications and amplifier topology, enabling drop-in replacement with no circuit redesign.

Functional Equivalent: Parts that satisfy the core functional requirements (2-circuit voltage feedback amplifier, rail-to-rail output, 8-SOIC package) but with variations in performance parameters such as slew rate, bandwidth, or supply current. These require circuit validation before implementation.

Parameter Comparison

Parameter	AD8042AR	AD8042ARZ	MAX4017ESA+	MAX4017ESA+T	MAX4217ESA+	MAX4217ESA+T	TSH82IDT
Manufacturer	Analog Devices	Analog Devices	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	STMicroelectronics
Amplifier Type	Voltage Feedback	Voltage Feedback	Buffer, Voltage Feedback	Buffer, Voltage Feedback	Buffer, Voltage Feedback	Buffer, Voltage Feedback	General Purpose
Number of Circuits	2	2	2	2	2	2	2
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	225	225	600	600	600	600	118
Gain Bandwidth Product (MHz)	90	90	140	140	—	—	65
-3dB Bandwidth (MHz)	170	170	200	200	230	230	100
Current - Input Bias (µA)	1.2	1.2	5.4	5.4	5.4	5.4	6
Voltage - Input Offset (mV)	3	3	4	4	4	4	0.8
Current - Supply per 2 Channels (mA)	6	6	5.5	5.5	5.5	5.5	9.8
Current - Output / Channel (mA)	50	50	120	120	120	120	55
Voltage - Supply Span Min (V)	3	3	3.15	3.15	3.15	3.15	4.5
Voltage - Supply Span Max (V)	12	12	11	11	11	11	12
Operating Temperature (°C)	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	—	Tube	Tube	Tape & Reel	Tube	Tape & Reel	Cut Tape & Digi-Reel

Engineering Selection Recommendations

AD8042ARZ is the primary direct equivalent for the AD8042AR. Both devices are manufactured by Analog Devices Inc. and share identical electrical specifications including voltage feedback topology, 2-circuit configuration, rail-to-rail output, 225V/µs slew rate, 90 MHz gain bandwidth product, and 170 MHz -3dB bandwidth. The AD8042ARZ is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. The primary distinction is packaging format: AD8042ARZ is supplied in tube packaging, whereas the original AD8042AR packaging is unspecified. This substitution requires no circuit modification and is suitable for direct replacement in production designs.

MAX4017ESA+ and MAX4017ESA+T are functional equivalents offering enhanced performance characteristics. Both devices maintain the 2-circuit voltage feedback amplifier architecture with rail-to-rail output in 8-SOIC packages. Performance improvements include 600V/µs slew rate (2.67× higher than AD8042AR), 140 MHz gain bandwidth product (1.56× higher), and 200 MHz -3dB bandwidth (1.18× higher). Output current capability is doubled to 120 mA per channel. Supply current is reduced to 5.5 mA per 2 channels. These devices are active production components with ROHS3 compliance. MAX4017ESA+ is supplied in tube packaging; MAX4017ESA+T is supplied in tape and reel format. Circuit validation is required to confirm compatibility with existing designs due to performance parameter variations.

MAX4217ESA+ and MAX4217ESA+T are functional equivalents with specifications similar to the MAX4017 series. These devices feature 600V/µs slew rate, 230 MHz -3dB bandwidth (1.35× higher than AD8042AR), and 120 mA output current per channel. Gain bandwidth product is not specified in available data. Supply current remains at 5.5 mA per 2 channels. Both variants are active production components with ROHS3 compliance. MAX4217ESA+ is supplied in tube packaging; MAX4217ESA+T is supplied in tape and reel format. Circuit validation is required before implementation.

TSH82IDT is a functional equivalent manufactured by STMicroelectronics with general purpose amplifier topology. This device maintains 2-circuit configuration, rail-to-rail output, and 8-SOIC package. Performance characteristics include 118V/µs slew rate (52% of AD8042AR), 65 MHz gain bandwidth product (72% of AD8042AR), and 100 MHz -3dB bandwidth (59% of AD8042AR). Input offset voltage is superior at 0.8 mV. Supply voltage minimum is 4.5V (higher than AD8042AR's 3V). The TSH82IDT is qualified to AEC-Q100 automotive standard and is active production status with ROHS3 compliance. This substitution is suitable only for applications where reduced bandwidth and slew rate are acceptable.

TL074CPW and TL082ACDR are not recommended as direct substitutes. TL074CPW is a 4-circuit J-FET amplifier in 14-TSSOP package with significantly different topology, package, and performance characteristics. TL082ACDR is a 2-circuit J-FET amplifier in 8-SOIC package with 3 MHz gain bandwidth product and 13V/µs slew rate, representing substantial performance reduction. These devices are listed in the original part's substitute field but do not meet the functional requirements for voltage feedback amplifier applications requiring 90 MHz bandwidth.

INA149AID is not recommended as a substitute. This device is a differential amplifier with single circuit configuration, fundamentally different topology from the voltage feedback amplifier architecture of the AD8042AR. Electrical specifications including 5V/µs slew rate and 500 kHz bandwidth are incompatible with the original device's performance envelope.

Frequently Asked Questions (FAQ)

Q: Can AD8042ARZ be used as a direct replacement for AD8042AR in existing designs?

A: Yes. AD8042ARZ is a direct equivalent with identical electrical specifications, amplifier topology, circuit count, output type, and operating temperature range. Both devices are manufactured by Analog Devices Inc. and housed in 8-SOIC packages. The primary difference is packaging format (tube versus unspecified). No circuit redesign is required. AD8042ARZ is currently in active production with ROHS3 compliance.

Q: What are the advantages of MAX4017ESA+ or MAX4217ESA+ over AD8042AR?

A: The MAX4017 and MAX4217 series offer enhanced performance specifications: slew rate is increased to 600V/µs (2.67× higher), -3dB bandwidth is increased to 200 MHz or 230 MHz respectively, and output current capability is doubled to 120 mA per channel. Supply current is reduced to 5.5 mA per 2 channels. These improvements are beneficial for applications requiring higher speed or higher output drive capability. However, circuit validation is required to confirm compatibility with existing designs.

Q: Are the MAX4017 and MAX4217 series pin-compatible with AD8042AR?

A: Yes. Both MAX4017 and MAX4217 series devices are housed in 8-SOIC packages with identical pinout to the AD8042AR. Physical substitution is possible without PCB modification. However, electrical performance differences require circuit analysis to confirm functional compatibility.

Q: What is the difference between MAX4017ESA+ and MAX4017ESA+T?

A: Both devices are electrically identical. The difference is packaging format: MAX4017ESA+ is supplied in tube packaging for manual handling and lower-volume applications; MAX4017ESA+T is supplied in tape and reel format for automated assembly and higher-volume production. Selection depends on manufacturing process requirements.

Q: Can TSH82IDT be used as a substitute for AD8042AR?

A: TSH82IDT is a functional equivalent only for applications where reduced bandwidth and slew rate are acceptable. TSH82IDT provides 65 MHz gain bandwidth product (72% of AD8042AR) and 118V/µs slew rate (52% of AD8042AR). The device is qualified to AEC-Q100 automotive standard and is suitable for automotive applications. Circuit validation is required to confirm performance adequacy for the specific application.

Q: Why are TL074CPW and TL082ACDR listed as substitutes but not recommended?

A: TL074CPW and TL082ACDR are J-FET amplifiers with fundamentally different topology from the voltage feedback architecture of AD8042AR. TL074CPW is a 4-circuit device in 14-TSSOP package. TL082ACDR is a 2-circuit device with 3 MHz gain bandwidth product and 13V/µs slew rate, representing substantial performance reduction. These devices do not meet the functional requirements for applications designed around the AD8042AR's 90 MHz bandwidth and 225V/µs slew rate.

Q: What is the significance of ROHS3 compliance for substitute parts?

A: ROHS3 compliance indicates conformance to Restriction of Hazardous Substances Directive 3, which restricts the use of specific hazardous materials in electrical and electronic equipment. All recommended active production substitutes (AD8042ARZ, MAX4017 series, MAX4217 series, TSH82IDT) are ROHS3 compliant, ensuring compatibility with environmental regulations and modern manufacturing standards. The original AD8042AR is obsolete and ROHS compliance status is not specified.

Q: What is Moisture Sensitivity Level (MSL) and why does it matter?

A: Moisture Sensitivity Level indicates the component's susceptibility to moisture absorption during storage and handling. MSL 1 (Unlimited) means the component has unlimited shelf life under normal storage conditions. MSL 2 (1 Year) means the component must be used within one year of the manufacturing date. AD8042AR, AD8042ARZ, and all MAX4017/MAX4217 variants have MSL 1 rating. TSH82IDT has MSL 1 rating. Lower MSL ratings simplify inventory management and reduce risk of moisture-induced failures during assembly.

Q: Is circuit redesign required when substituting AD8042AR with MAX4017ESA+ or MAX4217ESA+?

A: Circuit validation is required. While both MAX4017 and MAX4217 series maintain the same package, pinout, and basic topology, performance parameters differ significantly. Slew rate is 2.67× higher, bandwidth is 1.18× to 1.35× higher, and output current is 2.4× higher. These differences may affect circuit stability, frequency response, and output impedance. Simulation and prototype testing are recommended before production implementation.

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