AD8056ARM Equivalent & Substitute Parts

Part Overview

The AD8056ARM is a voltage feedback amplifier integrated circuit manufactured by Analog Devices Inc., configured with 2 circuits in an 8-MSOP surface mount package. This device is classified as obsolete, indicating discontinuation from active production. The AD8056ARM operates across a supply voltage range of 8V to 12V with an operating temperature range of -40°C to 125°C, delivering a slew rate of 1400V/µs and -3dB bandwidth of 300 MHz. Identification of equivalent and substitute parts is necessary due to the obsolete product status, ensuring design continuity and procurement availability for applications requiring voltage feedback amplifier functionality.

Key Parameters

Parameter	Value
Amplifier Type	Voltage Feedback
Number of Circuits	2
Slew Rate	1400V/µs
-3dB Bandwidth	300 MHz
Current - Input Bias	400 nA
Voltage - Input Offset	3 mV
Current - Supply	10 mA
Current - Output / Channel	60 mA
Voltage - Supply Span (Min)	8 V
Voltage - Supply Span (Max)	12 V
Operating Temperature	-40°C to 125°C
Mounting Type	Surface Mount
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AD8056ARM is determined by alignment across the following critical parameters: amplifier type (voltage feedback), number of circuits (2), surface mount packaging compatibility (8-MSOP or equivalent 8-pin configurations), and electrical performance characteristics including slew rate, bandwidth, input bias current, and supply voltage range.

The substitute parts are grouped into two categories:

Direct Equivalent: AD8056ARMZ represents a direct functional equivalent manufactured by Analog Devices Inc., maintaining identical electrical specifications while offering active product status and improved availability.

Functional Alternatives: Texas Instruments and National Semiconductor voltage feedback amplifiers (LMH series) provide alternative solutions with comparable 2-circuit configurations and surface mount packaging. These alternatives exhibit variations in slew rate, bandwidth, input bias current, and supply voltage parameters, requiring evaluation against specific application requirements.

Substitution validity is established when the substitute part maintains or exceeds the minimum electrical performance of the AD8056ARM across supply voltage range, operating temperature span, and output current capability, while maintaining compatible surface mount package geometry.

Parameter Comparison

Parameter	AD8056ARM	AD8056ARMZ	LMH6622MM/NOPB	LMH6655MM/NOPB	LMH6658MM/NOPB	LMH6682MMX/NOPB
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback
Number of Circuits	2	2	2	2	2	2
Slew Rate	1400V/µs	1400V/µs	85V/µs	200V/µs	700V/µs	940V/µs
-3dB Bandwidth	300 MHz	300 MHz	160 MHz	260 MHz	270 MHz	190 MHz
Current - Input Bias	400 nA	400 nA	4.7 µA	5 µA	5 µA	5 µA
Voltage - Input Offset	3 mV	3 mV	200 µV	1 mV	1 mV	1 mV
Current - Supply	10 mA	10 mA	4.3 mA (x2 Channels)	4.5 mA (x2 Channels)	6.5 mA (x2 Channels)	6.5 mA (x2 Channels)
Current - Output / Channel	60 mA	60 mA	90 mA	120 mA	110 mA	85 mA
Voltage - Supply Span (Min)	8 V	8 V	5 V	4.5 V	3 V	3 V
Voltage - Supply Span (Max)	12 V	12 V	12 V	12 V	12 V	12 V
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-MSOP	8-MSOP	8-VSSOP	8-VSSOP	8-VSSOP	8-VSSOP
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

AD8056ARMZ is the primary recommended substitute for the obsolete AD8056ARM. This part maintains identical electrical specifications and operating temperature range (-40°C to 125°C), ensuring direct functional compatibility. AD8056ARMZ carries active product status with ROHS3 compliance and REACH unaffected certification, providing long-term procurement stability and regulatory alignment. Inventory availability of 5830 pieces supports immediate deployment.

LMH6658MM/NOPB and LMH6658MMX/NOPB are suitable alternatives for applications where the extended operating temperature range of the AD8056ARM is not required. These parts deliver comparable slew rate performance (700V/µs) and bandwidth (270 MHz), with rail-to-rail output capability and lower minimum supply voltage (3V). Both parts maintain ROHS3 compliance and offer substantial inventory availability (15300 and 16772 pieces respectively).

LMH6682MMX/NOPB provides an intermediate performance option with slew rate of 940V/µs and bandwidth of 190 MHz. This part supports the full 8V to 12V supply range of the AD8056ARM and maintains ROHS3 compliance with 2774 pieces in inventory.

LMH6655MM/NOPB and LMH6655MMX/NOPB are applicable for lower-speed applications where 200V/µs slew rate and 260 MHz bandwidth are sufficient. These parts offer lower supply current (4.5 mA) and extended output current capability (120 mA per channel), with ROHS3 compliance and active product status.

LMH6622MM/NOPB and LMH6622MMX/NOPB are limited substitutes due to reduced slew rate (85V/µs) and bandwidth (160 MHz), suitable only for applications with relaxed frequency response requirements.

Selection of any substitute part requires verification that the application does not depend on the AD8056ARM's extended operating temperature range (up to 125°C), as all LMH series alternatives are rated to 85°C maximum.

Frequently Asked Questions (FAQ)

Q: Can AD8056ARMZ be used as a direct replacement for AD8056ARM?

A: Yes. AD8056ARMZ maintains identical electrical specifications, operating temperature range (-40°C to 125°C), supply voltage range (8V to 12V), and package configuration (8-MSOP). The primary difference is product status: AD8056ARMZ is active while AD8056ARM is obsolete. AD8056ARMZ is the recommended direct substitute.

Q: What are the key differences between AD8056ARM and the LMH series alternatives?

A: The primary differences are: (1) Operating temperature maximum: AD8056ARM operates to 125°C while LMH series parts are limited to 85°C; (2) Slew rate: AD8056ARM delivers 1400V/µs compared to LMH6658 (700V/µs), LMH6682 (940V/µs), LMH6655 (200V/µs), and LMH6622 (85V/µs); (3) Input bias current: AD8056ARM specifies 400 nA while LMH series parts specify 5 µA or higher; (4) Minimum supply voltage: LMH6658 and LMH6682 support 3V minimum compared to 8V for AD8056ARM.

Q: Are the LMH series parts pin-compatible with AD8056ARM?

A: Both AD8056ARM and LMH series parts use 8-pin surface mount packages (8-MSOP and 8-VSSOP respectively). While pin counts are identical, physical package dimensions differ slightly. PCB layout verification is required to confirm mechanical fit. Electrical pin assignments must be verified against individual datasheets.

Q: Which substitute part should be selected for high-temperature applications?

A: If the application requires operation at temperatures above 85°C, AD8056ARMZ is the only suitable substitute, as it maintains the AD8056ARM's operating temperature range of -40°C to 125°C. All LMH series alternatives are limited to 85°C maximum.

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

A: ROHS3 compliance indicates conformance to Restriction of Hazardous Substances regulations. AD8056ARMZ and all LMH series alternatives carry ROHS3 certification, ensuring regulatory alignment with current environmental and safety standards. The obsolete AD8056ARM does not specify RoHS status.

Q: Can LMH6658MM/NOPB replace AD8056ARM in all applications?

A: LMH6658MM/NOPB is suitable for applications where the operating temperature does not exceed 85°C. The part delivers superior slew rate (700V/µs vs. 1400V/µs) and comparable bandwidth (270 MHz vs. 300 MHz). However, the reduced input bias current (5 µA vs. 400 nA) and lower minimum supply voltage (3V vs. 8V) may affect circuit performance in precision applications. Application-specific evaluation is required.

Q: What inventory considerations apply to substitute part selection?

A: AD8056ARMZ offers the highest inventory availability (5830 pieces) among direct equivalents. LMH6658MM/NOPB and LMH6658MMX/NOPB provide the largest LMH series inventory (15300 and 16772 pieces respectively). All substitute parts are classified as new original stock, ensuring component authenticity and quality.

Q: How do supply voltage requirements affect substitute selection?

A: AD8056ARM requires a minimum supply voltage of 8V. LMH6658 and LMH6682 series parts operate from 3V minimum, providing greater flexibility in low-voltage applications. LMH6655 series supports 4.5V minimum, and LMH6622 requires 5V minimum. Applications with fixed 8V to 12V supply can utilize any substitute part; applications with lower supply voltages require LMH6658 or LMH6682 selection.

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