AD8061ARTZ-R2 Equivalent & Substitute Parts

Part Overview

The AD8061ARTZ-R2 is a voltage feedback amplifier manufactured by Analog Devices Inc., designed for single-circuit rail-to-rail applications in SOT-23-5 surface mount packaging. This operational amplifier is characterized by high slew rate (650V/µs) and wide bandwidth (320 MHz), making it suitable for high-speed signal conditioning and amplification circuits.

The AD8061ARTZ-R2 is discontinued at DiGi Electronics. Equivalent and substitute parts are necessary to maintain design continuity, ensure component availability, and support ongoing production requirements. Substitute selection must be based on electrical performance parameters, package compatibility, and operating temperature ranges.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	650	V/µs
-3dB Bandwidth	320	MHz
Current - Input Bias	3.5	µA
Voltage - Input Offset	1	mV
Current - Supply	6.8	mA
Current - Output / Channel	50	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	8	V
Operating Temperature	-40 to 85	°C
Package / Case	SC-74A, SOT-753	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the AD8061ARTZ-R2 is determined by the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: Voltage Feedback (required for direct functional replacement)
Number of Circuits: 1 (single-channel configuration)
Output Type: Rail-to-Rail (output swing capability)
Package / Case: SOT-23-5 compatible (SC-74A, SOT-753)
Mounting Type: Surface Mount

Secondary Performance Parameters:

Slew Rate: 650V/µs (high-speed performance requirement)
-3dB Bandwidth: 320 MHz (frequency response specification)
Current - Output / Channel: 50 mA (output drive capability)
Voltage - Supply Span: 2.7V to 8V (supply voltage compatibility)
Operating Temperature: -40°C to 85°C (thermal operating range)

Substitute parts are grouped into two categories:

Category 1: Voltage Feedback Amplifiers (Direct Functional Equivalents) Parts maintaining voltage feedback topology with comparable high-speed performance characteristics.

Category 2: General Purpose Amplifiers (Functional Alternatives) Parts with general purpose topology offering rail-to-rail output and SOT-23-5 packaging, suitable for applications where voltage feedback topology is not mandatory.

Parameter Comparison

Parameter	AD8061ARTZ-R2	OPA356AQDBVRQ1	LTC6240HS5#TRPBF	MCP661T-E/OT	MCP6L91T-E/OT
Amplifier Type	Voltage Feedback	Voltage Feedback	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	650	360	10	32	7
Bandwidth (MHz)	320	450	18	60	10
Current - Input Bias (pA/µA)	3.5 µA	3 pA	0.2 pA	6 pA	1 pA
Voltage - Input Offset (mV)	1	2	0.05	1.8	1
Current - Supply (mA)	6.8	8.3	2	6	0.85
Current - Output / Channel (mA)	50	100	30	—	—
Voltage - Supply Span (Min)	2.7 V	2.5 V	2.8 V	2.5 V	2.4 V
Voltage - Supply Span (Max)	8 V	5.5 V	6 V	5.5 V	6 V
Operating Temperature	-40 to 85°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SOT-23-5 Thin, TSOT-23-5	SC-74A, SOT-753	SC-74A, SOT-753
Product Status	Discontinued	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Voltage Feedback Replacement:

The OPA356AQDBVRQ1 (Texas Instruments) is the primary substitute for the AD8061ARTZ-R2. Both devices maintain voltage feedback amplifier topology with rail-to-rail output in SOT-23-5 packaging. The OPA356AQDBVRQ1 provides superior performance with 360V/µs slew rate and 450 MHz bandwidth, exceeding the original specification. Output current capability is 100 mA, compared to 50 mA in the AD8061ARTZ-R2. The OPA356AQDBVRQ1 is qualified to AEC-Q100 automotive standards and is actively produced. Operating temperature range extends to 125°C, providing broader thermal coverage than the original part.

For General Purpose Applications:

When voltage feedback topology is not a design requirement, the following active alternatives are available:

LTC6240HS5#TRPBF (Analog Devices Inc.): General purpose amplifier with extended operating temperature range (-40°C to 125°C). Supply voltage range is 2.8V to 6V. Input bias current is significantly lower (0.2 pA) compared to the AD8061ARTZ-R2 (3.5 µA). Slew rate is 10V/µs and bandwidth is 18 MHz. Output current is 30 mA. ROHS3 compliant and actively produced.
MCP661T-E/OT (Microchip Technology): General purpose amplifier with 32V/µs slew rate and 60 MHz bandwidth. Supply voltage range is 2.5V to 5.5V. Operating temperature range is -40°C to 125°C. ROHS3 compliant and actively produced.
MCP6L91T-E/OT (Microchip Technology): General purpose amplifier with 7V/µs slew rate and 10 MHz bandwidth. Supply voltage range is 2.4V to 6V. Operating temperature range is -40°C to 125°C. Supply current is 850 µA. ROHS3 compliant with highest inventory availability (105,100 pcs).

Compliance and Availability:

All recommended substitutes are ROHS3 compliant and actively produced. The OPA356AQDBVRQ1 carries AEC-Q100 automotive qualification. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating, matching the original AD8061ARTZ-R2 specification.

Frequently Asked Questions (FAQ)

Q1: Can the OPA356AQDBVRQ1 directly replace the AD8061ARTZ-R2 without circuit modification?

A: The OPA356AQDBVRQ1 maintains voltage feedback amplifier topology and SOT-23-5 packaging, enabling direct pin-compatible substitution. Both devices feature rail-to-rail output and single-circuit configuration. The OPA356AQDBVRQ1 provides superior performance specifications (360V/µs slew rate, 450 MHz bandwidth, 100 mA output current). Circuit operation is compatible within the overlapping supply voltage range (2.7V to 5.5V). Extended operating temperature range of the OPA356AQDBVRQ1 (-40°C to 125°C) covers the original specification (-40°C to 85°C).

Q2: What is the difference between voltage feedback and general purpose amplifier topologies?

A: The AD8061ARTZ-R2 is a voltage feedback amplifier, characterized by high slew rate (650V/µs) and wide bandwidth (320 MHz), optimized for high-speed signal conditioning. General purpose amplifiers (LTC6240, MCP661, MCP6L91 series) offer lower slew rates and narrower bandwidth but provide lower input bias current and reduced supply current consumption. Voltage feedback topology is required for applications demanding high-speed transient response and wide frequency response. General purpose amplifiers are suitable for precision DC and low-frequency AC applications.

Q3: Are all substitute parts available in the same packaging?

A: All substitute parts are available in SOT-23-5 surface mount packaging. The AD8061ARTZ-R2 uses SC-74A and SOT-753 designations, which are equivalent to SOT-23-5. The LTC6240 series uses TSOT-23-5 (thin variant) packaging. Physical dimensions and pin assignments are compatible across all listed substitutes, enabling direct PCB placement without layout modification.

Q4: What are the supply voltage compatibility considerations?

A: The AD8061ARTZ-R2 operates from 2.7V to 8V supply voltage. The OPA356AQDBVRQ1 operates from 2.5V to 5.5V, requiring circuit redesign if supply voltage exceeds 5.5V. The LTC6240 series operates from 2.8V to 6V. The MCP661T-E/OT operates from 2.5V to 5.5V. The MCP6L91T-E/OT operates from 2.4V to 6V. Verify supply voltage compatibility with your application before substitution.

Q5: How do input bias current specifications affect circuit design?

A: The AD8061ARTZ-R2 has input bias current of 3.5 µA. The OPA356AQDBVRQ1 has 3 pA (1000× lower). The LTC6240 series has 0.2 pA (17,500× lower). Lower input bias current reduces DC offset errors and simplifies input impedance matching. Applications with high-impedance input sources benefit from lower input bias current. Existing circuit designs may require input impedance adjustment when substituting parts with significantly different bias current specifications.

Q6: What is the significance of the discontinued product status?

A: The AD8061ARTZ-R2 is discontinued at DiGi Electronics, indicating no further production or distribution through standard channels. Existing inventory is limited (2,100 pcs reported). All recommended substitutes are actively produced and have confirmed inventory availability, ensuring long-term supply chain continuity. New designs should incorporate active substitute parts to avoid future obsolescence issues.

Q7: Are there temperature range limitations for substitute selection?

A: The AD8061ARTZ-R2 operates from -40°C to 85°C. The OPA356AQDBVRQ1, LTC6240 series, MCP661T-E/OT, and MCP6L91T-E/OT all extend to -40°C to 125°C. If your application requires operation only within -40°C to 85°C, all substitutes are compatible. Applications requiring operation above 85°C benefit from the extended temperature range of active substitutes.

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