AD9632AR Equivalent & Substitute Parts

Part Overview

The AD9632AR is a voltage feedback amplifier manufactured by Analog Devices Inc., configured as a single-circuit 8-SOIC surface mount device. This linear amplifier is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design requirements and production continuity. The AD9632AR delivers a slew rate of 1500V/µs with a -3dB bandwidth of 250 MHz, suitable for high-speed signal conditioning applications. Locating functionally compatible alternatives ensures design flexibility and supply chain resilience.

Key Parameters

Parameter	Value
Amplifier Type	Voltage Feedback
Number of Circuits	1
Slew Rate	1500V/µs
-3dB Bandwidth	250 MHz
Current - Input Bias	2 µA
Voltage - Input Offset	2 mV
Current - Supply	16 mA
Current - Output / Channel	70 mA
Voltage - Supply Span (Min)	6 V
Voltage - Supply Span (Max)	12 V
Operating Temperature	-40°C to 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AD9632AR is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Mandatory Matching Parameters:

Amplifier Type: Voltage Feedback
Number of Circuits: 1
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C to 85°C

Performance Parameters for Compatibility Assessment:

Slew Rate: 1500V/µs (baseline)
-3dB Bandwidth: 250 MHz (baseline)
Current - Output / Channel: 70 mA (baseline)
Voltage - Supply Span: 6V to 12V (baseline)

Substitute parts are grouped into two categories:

Direct Equivalent: Parts with identical electrical specifications and active product status, enabling direct replacement without circuit redesign.

Functional Substitute: Parts with voltage feedback amplifier topology in 8-SOIC packaging that meet or exceed baseline performance parameters, though with different electrical characteristics. These require engineering evaluation for specific application requirements.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	-3dB Bandwidth (MHz)	Input Bias (µA/pA)	Input Offset (mV/µV)	Supply Current (mA)	Output Current (mA)	Supply Span (V)	Product Status
AD9632AR	Analog Devices	Voltage Feedback	1500	250	2 µA	2 mV	16	70	6-12	Obsolete
AD9632ARZ	Analog Devices	Voltage Feedback	1500	250	2 µA	2 mV	16	70	6-12	Active
OPA656U	Texas Instruments	Voltage Feedback	295	500	2 pA	250 µV	14	70	8-12	Last Time Buy
OPA656UB	Texas Instruments	Voltage Feedback	295	500	1 pA	250 µV	14	70	8-12	Last Time Buy
OPA657U	Texas Instruments	Voltage Feedback	700	350	2 pA	250 µV	14	70	8-12	Active
OPA657UB	Texas Instruments	Voltage Feedback	700	350	1 pA	100 µV	14	70	8-12	Active
OPA842ID	Texas Instruments	Voltage Feedback	400	200	20 µA	300 µV	20.2	100	10-12	Active

Engineering Selection Recommendations

Primary Recommendation: AD9632ARZ

The AD9632ARZ is the direct equivalent of the AD9632AR with identical electrical specifications across all measured parameters. This part is manufactured by Analog Devices Inc. and carries Active product status, ensuring long-term availability and supply continuity. The AD9632ARZ is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. This part is the preferred replacement for the obsolete AD9632AR in all applications where the original device was specified.

Secondary Recommendations: OPA657U and OPA657UB

The OPA657U and OPA657UB are voltage feedback amplifiers in 8-SOIC packaging with Active product status. Both devices exceed the baseline slew rate (700V/µs versus 1500V/µs baseline) and -3dB bandwidth (350 MHz versus 250 MHz baseline) of the AD9632AR. The OPA657UB offers superior input offset voltage (100 µV) and lower input bias current (1 pA) compared to the OPA657U. Both are ROHS3 compliant and REACH unaffected. These devices are suitable for applications requiring enhanced performance margins.

Alternative Consideration: OPA656U and OPA656UB

The OPA656U and OPA656UB are voltage feedback amplifiers with Last Time Buy status. These devices provide -3dB bandwidth of 500 MHz, exceeding the AD9632AR baseline. However, Last Time Buy status indicates limited future availability. The OPA656UB provides lower input bias current (1 pA) than the OPA656U (2 pA). These parts are ROHS3 compliant and REACH unaffected but should be evaluated only when OPA657 series alternatives are unavailable.

Not Recommended: OPA842ID and INA828IDR

The OPA842ID exhibits supply span limitations (10V to 12V minimum) that do not accommodate the AD9632AR baseline range (6V to 12V). The INA828IDR is an instrumentation amplifier with fundamentally different topology and performance characteristics, making it unsuitable for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can the AD9632ARZ be used as a direct replacement for the AD9632AR?

A: Yes. The AD9632ARZ is electrically and mechanically identical to the AD9632AR. Both devices share the same slew rate (1500V/µs), bandwidth (250 MHz), supply current (16 mA), output current (70 mA), and supply voltage range (6V to 12V). The primary difference is product status: AD9632ARZ is Active while AD9632AR is Obsolete. No circuit redesign is required.

Q: What is the difference between OPA657U and OPA657UB?

A: Both devices are voltage feedback amplifiers with identical slew rate (700V/µs) and bandwidth (350 MHz). The OPA657UB has lower input bias current (1 pA versus 2 pA) and lower input offset voltage (100 µV versus 250 µV). The OPA657UB provides superior precision characteristics and is suitable for applications requiring tighter input specifications.

Q: Why is OPA842ID not recommended as a substitute?

A: The OPA842ID has a minimum supply voltage of 10V, which exceeds the AD9632AR minimum requirement of 6V. Applications designed for 6V to 9V operation cannot use the OPA842ID without circuit modification. Additionally, the OPA842ID has higher supply current (20.2 mA versus 16 mA) and higher output current (100 mA versus 70 mA), indicating different power delivery requirements.

Q: Are all substitute parts available in 8-SOIC packaging?

A: Yes. All recommended substitute parts are available in 8-SOIC (0.154", 3.90mm Width) surface mount packaging, matching the AD9632AR mechanical footprint. PCB layout compatibility is maintained across all listed alternatives.

Q: What is the significance of Last Time Buy status for OPA656U and OPA656UB?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for these products. While currently available, future procurement may become difficult or impossible. For new designs or long-term production requirements, Active status products such as OPA657U and OPA657UB are preferred to ensure sustained supply availability.

Q: Can OPA657U or OPA657UB be used in applications originally designed for AD9632AR?

A: Yes, with engineering evaluation. The OPA657 series exceeds AD9632AR performance in slew rate (700V/µs versus 1500V/µs) and bandwidth (350 MHz versus 250 MHz). However, the OPA657 series has lower input bias current (1-2 pA versus 2 µA) and lower input offset voltage (100-250 µV versus 2 mV). These differences may affect circuit behavior in precision applications. Circuit simulation and prototype testing are recommended to confirm compatibility with specific application requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts carry RoHS3 compliance certification. The AD9632AR does not specify RoHS status, but the AD9632ARZ and all Texas Instruments alternatives (OPA656, OPA657, OPA842 series) are explicitly RoHS3 compliant.

Q: What is the operating temperature range for substitute parts?

A: All recommended substitute parts operate across the -40°C to 85°C temperature range, matching the AD9632AR specification. This ensures thermal compatibility in applications with identical environmental requirements.

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