AD620BR Equivalent & Substitute Parts

Part Overview

The AD620BR is an instrumentation amplifier manufactured by Analog Devices Inc., housed in an 8-SOIC surface mount package. This device integrates a single instrumentation amplifier circuit designed for precision signal conditioning applications. The AD620BR is classified as obsolete, which necessitates identification of equivalent and substitute components for new designs or production continuity. Active alternatives with identical or enhanced electrical characteristics are available from both Analog Devices and third-party manufacturers.

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	15	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
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 AD620BR is determined by strict alignment of electrical and mechanical parameters within the instrumentation amplifier category. The primary substitution criteria are:

Critical Parameters for Substitution:

Amplifier Type: Instrumentation
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C to 85°C
Voltage Supply Span: Minimum 4.6 V, Maximum 36 V

Secondary Parameters Affecting Compatibility:

Slew Rate: 1.2 V/µs (baseline)
-3dB Bandwidth: 1 MHz (baseline)
Current - Input Bias: 500 pA (baseline)
Voltage - Input Offset: 15 µV (baseline)
Current - Supply: 900 µA (baseline)
Current - Output / Channel: 18 mA (baseline)

Substitute parts are grouped into two categories: direct equivalents (identical electrical specifications and active product status) and functional alternatives (enhanced or modified specifications within acceptable operating parameters).

Parameter Comparison

Parameter	AD620BR	AD620BRZ	AD8422BRZ	INA118U	INA118UB/2K5	INA121U/2K5
Manufacturer	Analog Devices	Analog Devices	Analog Devices	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active
Amplifier Type	Instrumentation	Instrumentation	Instrumentation	Instrumentation	Instrumentation	Instrumentation
Slew Rate (V/µs)	1.2	1.2	0.8	0.9	0.9	0.7
-3dB Bandwidth (MHz)	1	1	2.2	0.8	0.8	0.005
Current - Input Bias (pA)	500	500	200	1000	1000	4
Voltage - Input Offset (µV)	15	15	25	25	10	200
Current - Supply (µA)	900	900	300	350	350	450
Current - Output / Channel (mA)	18	18	20	12	12	14
Voltage - Supply Span Min (V)	4.6	4.6	4.6	2.7	2.7	4.5
Voltage - Supply Span Max (V)	36	36	36	36	36	36
Operating Temperature (°C)	-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
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	2 (1 Year)	3 (168 Hours)

Engineering Selection Recommendations

Direct Equivalent - Recommended for Obsolescence Replacement:

AD620BRZ is the direct functional equivalent of AD620BR. This part maintains identical electrical specifications across all critical parameters: slew rate, bandwidth, input bias current, input offset voltage, supply current, and output current. AD620BRZ is manufactured by Analog Devices Inc. and carries active product status. The device is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The primary difference is packaging format (tube versus reel), which does not affect electrical performance. This substitution requires no circuit redesign.

Active Alternatives with Enhanced Specifications:

INA118UB/2K5 (Texas Instruments) provides an active alternative with improved input offset voltage (10 µV versus 15 µV) and lower supply current (350 µA versus 900 µA). This device maintains the 8-SOIC package and -40°C to 85°C operating range. The reduced supply current offers power consumption benefits in battery-powered applications. INA118UB/2K5 is ROHS3 compliant and carries MSL rating of 2 (1 Year).

INA121U/2K5 (Texas Instruments) offers extremely low input bias current (4 pA versus 500 pA), suitable for high-impedance signal sources. This device operates within the same supply voltage range and package format. The -3dB bandwidth is reduced to 5 kHz, making this selection appropriate for low-frequency instrumentation applications. INA121U/2K5 is ROHS3 compliant.

AD8422BRZ (Analog Devices) provides enhanced bandwidth (2.2 MHz versus 1 MHz) and rail-to-rail output capability. This device is suitable for applications requiring higher frequency response. Supply current is reduced to 300 µA. AD8422BRZ is ROHS3 compliant and REACH unaffected.

Regulatory and Compliance Considerations:

All recommended active substitutes carry ROHS3 compliance and REACH unaffected status. The obsolete AD620BR lacks these certifications. For new designs or production requiring regulatory compliance, AD620BRZ, INA118UB/2K5, INA121U/2K5, or AD8422BRZ are appropriate selections based on application requirements.

Frequently Asked Questions (FAQ)

Q: Can AD620BRZ directly replace AD620BR without circuit modification?

A: Yes. AD620BRZ is electrically identical to AD620BR across all specified parameters. The only difference is packaging format (tube versus reel). No circuit redesign is required. Both devices operate within the same voltage supply range (4.6 V to 36 V), maintain identical slew rate (1.2 V/µs), bandwidth (1 MHz), and output current (18 mA).

Q: What is the primary advantage of INA118UB/2K5 over AD620BR?

A: INA118UB/2K5 offers three key advantages: (1) improved input offset voltage of 10 µV compared to 15 µV, (2) reduced supply current of 350 µA compared to 900 µA, and (3) active product status with ROHS3 compliance. The device maintains the same 8-SOIC package and -40°C to 85°C operating temperature range. The lower supply current reduces power consumption in applications with multiple channels or battery-powered systems.

Q: Is INA121U/2K5 suitable for high-frequency applications?

A: No. INA121U/2K5 has a -3dB bandwidth of 5 kHz, significantly lower than AD620BR (1 MHz). This device is designed for low-frequency instrumentation applications such as sensor signal conditioning, strain gauge amplification, and thermocouple measurement. For applications requiring 1 MHz bandwidth or higher, AD620BRZ or AD8422BRZ are appropriate selections.

Q: What does the "/2K5" designation in part numbers indicate?

A: The "/2K5" suffix indicates packaging format: Cut Tape (CT) and Digi-Reel format with 2,500-piece reel quantity. This is a packaging and distribution designation that does not affect electrical specifications. Parts with this suffix are functionally identical to tube-packaged equivalents.

Q: Can AD8422BRZ replace AD620BR in existing designs?

A: AD8422BRZ can replace AD620BR if the application tolerates the following differences: (1) reduced slew rate (0.8 V/µs versus 1.2 V/µs), (2) enhanced bandwidth (2.2 MHz versus 1 MHz), (3) lower input bias current (200 pA versus 500 pA), (4) rail-to-rail output capability, and (5) reduced supply current (300 µA versus 900 µA). For applications sensitive to slew rate, circuit testing is required. For applications benefiting from higher bandwidth and lower power consumption, AD8422BRZ is a superior choice.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings?

A: MSL rating indicates moisture sensitivity during storage and handling. AD620BR and AD620BRZ carry MSL 1 (Unlimited), meaning no moisture precautions are required. INA118UB/2K5 carries MSL 2 (1 Year), requiring storage in dry conditions for up to one year. INA121U/2K5 carries MSL 3 (168 Hours), requiring more stringent moisture control. For applications with extended storage or humid environments, AD620BRZ is the preferred choice.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. All substitute parts listed use the 8-SOIC (0.154", 3.90mm Width) package with identical pin configuration and spacing. PCB layout and footprint remain unchanged. Surface mount assembly processes are identical across all substitutes.

Q: What is the difference between INA118U, INA118UB, and INA118UB/2K5?

A: These are variants of the same base device (INA118) with differences in packaging and specifications. INA118U and INA118UB differ in input offset voltage (25 µV versus 10 µV). INA118UB/2K5 is the same as INA118UB but supplied in Cut Tape and Digi-Reel format. All three maintain identical slew rate (0.9 V/µs), bandwidth (800 kHz), and supply current (350 µA).

Q: Why is AD620BR classified as obsolete?

A: AD620BR is obsolete due to product lifecycle management by Analog Devices Inc. The active equivalent AD620BRZ provides identical electrical performance and is the recommended replacement for new designs and production continuity.

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