AD620AR Equivalent & Substitute Parts

Part Overview

The AD620AR is an instrumentation amplifier manufactured by Analog Devices Inc., housed in an 8-SOIC surface mount package. This single-circuit device is classified as obsolete, though 5,656 units remain in stock. The AD620AR operates across a wide supply voltage range of 4.6V to 36V and is suitable for precision measurement and signal conditioning applications requiring low input offset voltage and minimal input bias current.

Due to the obsolete product status of the AD620AR, identifying equivalent and substitute parts is necessary for design continuity, long-term availability assurance, and procurement planning. Direct equivalents and functionally similar alternatives are available from both Analog Devices Inc. and Texas Instruments, offering active product status and enhanced compliance certifications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Instrumentation	—
Number of Circuits	1	—
Slew Rate	1.2	V/µs
-3dB Bandwidth	1	MHz
Current - Input Bias	500	pA
Voltage - Input Offset	30	µV
Current - Supply	900	µA
Current - Output / Channel	18	mA
Voltage - Supply Span (Min)	4.6	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the AD620AR is determined by strict equivalence across the following critical parameters: amplifier type (instrumentation), number of circuits (1), package type (8-SOIC surface mount), supply voltage range compatibility (minimum 4.6V, maximum 36V), and operating temperature range (-40°C to 85°C).

Substitute parts are grouped into two categories:

Direct Equivalent: Parts that maintain identical electrical specifications across slew rate, bandwidth, input bias current, input offset voltage, supply current, output current, and operating temperature range. The AD620ARZ represents a direct equivalent with identical performance characteristics and active product status.

Functional Alternatives: Parts that operate within the same supply voltage and temperature range, maintain the 8-SOIC package format, and preserve instrumentation amplifier functionality, but exhibit variations in secondary performance parameters such as slew rate, bandwidth, input bias current, or input offset voltage. These alternatives include the AD8422BRZ, LT1167 series, LT1168 series, and INA118U, each offering distinct trade-offs in performance metrics while maintaining core compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	Bandwidth (MHz)	Input Bias (pA)	Input Offset (µV)	Supply Current (µA)	Output Current (mA)	Temp Range (°C)	Package
AD620AR	Analog Devices Inc.	Obsolete	1.2	1	500	30	900	18	-40 to 85	8-SOIC
AD620ARZ	Analog Devices Inc.	Active	1.2	1	500	30	900	18	-40 to 85	8-SOIC
AD8422BRZ	Analog Devices Inc.	Active	0.8	2.2	200	25	300	20	-40 to 85	8-SOIC
LT1167ACS8#PBF	Analog Devices Inc.	Active	1.2	1	50	15	900	—	0 to 70	8-SOIC
LT1167ACS8#TRPBF	Analog Devices Inc.	Active	1.2	1	50	15	900	27	0 to 70	8-SOIC
LT1168CS8#PBF	Analog Devices Inc.	Active	0.5	0.4	80	20	350	32	0 to 70	8-SOIC
LT1168CS8#TRPBF	Analog Devices Inc.	Active	0.5	0.4	80	20	350	32	0 to 70	8-SOIC
LT1168IS8	Analog Devices Inc.	Active	0.5	0.4	80	20	350	32	-40 to 85	8-SOIC
LT1168IS8#PBF	Analog Devices Inc.	Active	0.5	0.4	80	20	350	32	-40 to 85	8-SOIC
LT1168IS8#TRPBF	Analog Devices Inc.	Active	0.5	0.4	80	20	350	32	-40 to 85	8-SOIC
INA118U	Texas Instruments	Active	0.9	0.8	1000	25	350	12	-40 to 85	8-SOIC

Engineering Selection Recommendations

Direct Replacement: The AD620ARZ is the primary direct equivalent to the AD620AR. Both parts maintain identical electrical specifications across all measured parameters. The AD620ARZ carries active product status, ROHS3 compliance, and REACH unaffected certification, providing superior long-term availability and regulatory assurance compared to the obsolete AD620AR.

Extended Temperature Range Compatibility: The LT1168IS8, LT1168IS8#PBF, and LT1168IS8#TRPBF variants maintain the full -40°C to 85°C operating temperature range of the AD620AR while offering reduced supply current (350µA versus 900µA) and improved input offset voltage (20µV versus 30µV). These parts are suitable for applications where lower power consumption is beneficial. All three variants carry active product status and ROHS3 compliance.

Enhanced Performance Alternative: The AD8422BRZ offers improved specifications including lower input bias current (200pA versus 500pA), lower input offset voltage (25µV versus 30µV), and reduced supply current (300µA versus 900µA). The AD8422BRZ features rail-to-rail output capability and maintains the full -40°C to 85°C operating temperature range. This part is recommended for applications requiring enhanced precision and lower power operation.

Reduced Temperature Range Alternatives: The LT1167ACS8#PBF and LT1167ACS8#TRPBF variants operate across 0°C to 70°C and are suitable for applications not requiring the full industrial temperature range. These parts maintain 1.2V/µs slew rate and 1MHz bandwidth matching the AD620AR, with significantly improved input bias current (50pA versus 500pA) and input offset voltage (15µV versus 30µV).

Texas Instruments Alternative: The INA118U from Texas Instruments provides instrumentation amplifier functionality within the same 8-SOIC package and -40°C to 85°C operating range. The INA118U features lower supply voltage minimum (2.7V versus 4.6V), reduced supply current (350µA), and improved input offset voltage (25µV). This part carries ROHS3 compliance and active product status.

Frequently Asked Questions (FAQ)

Q: Can the AD620ARZ be used as a direct replacement for the AD620AR?

A: Yes. The AD620ARZ is electrically and mechanically identical to the AD620AR across all specified parameters. The primary difference is product status: AD620ARZ is active with current manufacturing support, while AD620AR is obsolete. Both parts use the 8-SOIC package and operate across -40°C to 85°C with identical electrical performance.

Q: What are the key differences between the AD620AR and the LT1168IS8?

A: The LT1168IS8 maintains the same -40°C to 85°C operating temperature range and 8-SOIC package as the AD620AR. However, the LT1168IS8 exhibits lower slew rate (0.5V/µs versus 1.2V/µs), lower bandwidth (400kHz versus 1MHz), and significantly reduced supply current (350µA versus 900µA). The LT1168IS8 is suitable for applications where bandwidth requirements are lower and power consumption is a concern.

Q: Is the AD8422BRZ compatible with the AD620AR in all applications?

A: The AD8422BRZ operates within the same supply voltage range (4.6V to 36V) and temperature range (-40°C to 85°C) as the AD620AR and uses the same 8-SOIC package. However, the AD8422BRZ features rail-to-rail output capability and different performance characteristics: lower slew rate (0.8V/µs versus 1.2V/µs) and higher bandwidth (2.2MHz versus 1MHz). Applications requiring the exact slew rate and bandwidth of the AD620AR should verify compatibility before substitution.

Q: What is the significance of the packaging designations (Tube, Tape & Reel, Cut Tape)?

A: Packaging designations indicate the physical form in which parts are supplied. Tube packaging is suitable for manual handling and small-quantity applications. Tape & Reel (TR) and Cut Tape (CT) packaging are designed for automated assembly processes. The electrical and mechanical specifications of the part remain identical regardless of packaging format. Selection should be based on assembly process requirements.

Q: Can I use the INA118U as a substitute for the AD620AR?

A: The INA118U is compatible with the AD620AR in terms of package type (8-SOIC), supply voltage range (4.6V to 36V maximum), and operating temperature range (-40°C to 85°C). However, the INA118U has a lower minimum supply voltage (2.7V versus 4.6V) and different performance characteristics: lower slew rate (0.9V/µs versus 1.2V/µs), lower bandwidth (800kHz versus 1MHz), and significantly lower input bias current (1nA versus 500pA). Applications sensitive to input bias current or requiring 1MHz bandwidth should evaluate compatibility carefully.

Q: Why do some substitute parts have restricted operating temperature ranges?

A: The LT1167ACS8#PBF and LT1168CS8#PBF variants are specified for 0°C to 70°C operation, which is narrower than the AD620AR's -40°C to 85°C range. These parts are suitable only for applications operating within the 0°C to 70°C window. For applications requiring full -40°C to 85°C coverage, use the LT1168IS8 series or AD620ARZ instead.

Q: What compliance certifications should I verify when selecting a substitute?

A: All active substitute parts listed carry ROHS3 compliance and REACH unaffected certification. The AD620AR, being obsolete, does not carry these certifications. For applications subject to regulatory requirements mandating ROHS3 compliance, the AD620ARZ, AD8422BRZ, LT1167 series, LT1168 series, and INA118U all meet these requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message