AD9631AR Equivalent & Substitute Parts

Part Overview

The AD9631AR is a voltage feedback amplifier manufactured by Analog Devices Inc., configured as a single-circuit 8-SOIC surface mount device. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design requirements and production continuity. The AD9631AR delivers a slew rate of 1300V/µs with a -3dB bandwidth of 320 MHz, operating across a 6V to 12V supply span with input bias current of 2 µA and output current capability of 70 mA per channel.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	1	—
Slew Rate	1300	V/µs
-3dB Bandwidth	320	MHz
Current - Input Bias	2	µA
Voltage - Input Offset	3	mV
Current - Supply	17	mA
Current - Output / Channel	70	mA
Voltage - Supply Span (Min)	6	V
Voltage - Supply Span (Max)	12	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 AD9631AR is determined by alignment across the following critical parameters: amplifier type (voltage feedback), number of circuits (single circuit), package type (8-SOIC surface mount), slew rate capability (1300V/µs), bandwidth performance (-3dB bandwidth of 320 MHz), supply voltage range (6V to 12V minimum), and output current capacity (70 mA per channel).

Substitute parts are grouped into two categories:

Direct Equivalent: AD9631ARZ maintains identical electrical specifications and packaging, differing only in product status (active versus obsolete) and packaging format (tube versus unspecified).

Functional Equivalents: OPA656U, OPA656UB, OPA657U, and OPA657UB are voltage feedback amplifiers in 8-SOIC packages with comparable output current (70 mA), supply voltage ranges (8V to 12V), and operating temperature (-40°C to 85°C). These parts demonstrate higher slew rates and bandwidth performance than the AD9631AR, providing enhanced performance margins for high-speed applications.

Limited Compatibility: ISL28177FBZ-T7 and MCP6294T-E/SL are general-purpose amplifiers with different electrical characteristics, including significantly lower slew rates, reduced bandwidth, and different supply voltage requirements. These parts are included as reference alternatives only where application requirements permit relaxed performance specifications.

Parameter Comparison

Parameter	AD9631AR	AD9631ARZ	OPA656U	OPA656UB	OPA657U	OPA657UB	ISL28177FBZ-T7	MCP6294T-E/SL
Manufacturer	Analog Devices	Analog Devices	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Renesas Electronics	Microchip Technology
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1	1	1	4
Slew Rate (V/µs)	1300	1300	295	295	700	700	0.2	7
-3dB Bandwidth (MHz)	320	320	500	500	350	350	—	—
Gain Bandwidth Product (MHz)	—	—	230	230	1600	1600	0.6	10
Current - Input Bias (pA/µA)	2 µA	2 µA	2 pA	1 pA	2 pA	1 pA	200 pA	1 pA
Voltage - Input Offset (mV/µV)	3 mV	3 mV	250 µV	250 µV	250 µV	100 µV	150 µV	3 mV
Current - Supply (mA)	17	17	14	14	14	14	1.18	1 (x4)
Current - Output / Channel (mA)	70	70	70	70	70	70	30	25
Voltage - Supply Span Min (V)	6	6	8	8	8	8	6	2.4
Voltage - Supply Span Max (V)	12	12	12	12	12	12	40	6
Operating Temperature (°C)	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 125	-40 to 125
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	14-SOIC
Product Status	Obsolete	Active	Last Time Buy	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: AD9631ARZ

AD9631ARZ is the direct equivalent replacement for AD9631AR. This part maintains identical electrical specifications, package configuration (8-SOIC), and operating parameters. AD9631ARZ carries active product status with ROHS3 compliance and REACH unaffected certification, ensuring long-term availability and regulatory alignment. The transition from AD9631AR to AD9631ARZ requires no circuit redesign or performance validation.

Secondary Recommendations: OPA657UB and OPA657U

OPA657UB and OPA657U are voltage feedback amplifiers manufactured by Texas Instruments, available in 8-SOIC packages with active product status. These parts exceed AD9631AR performance specifications with 700V/µs slew rate (versus 1300V/µs in AD9631AR), 1.6 GHz gain bandwidth product, and 350 MHz -3dB bandwidth. Both maintain 70 mA output current, 8V to 12V supply range, and -40°C to 85°C operating temperature. OPA657UB provides superior input offset voltage (100 µV) and lower input bias current (1 pA) compared to OPA657U. Both carry ROHS3 compliance and REACH unaffected status. MSL rating of 3 (168 hours) requires controlled moisture exposure during storage and handling.

Tertiary Recommendations: OPA656U and OPA656UB

OPA656U and OPA656UB are voltage feedback amplifiers from Texas Instruments in 8-SOIC packages. These parts deliver 295V/µs slew rate, 230 MHz gain bandwidth product, and 500 MHz -3dB bandwidth. Output current capacity is 70 mA per channel with 8V to 12V supply range and -40°C to 85°C operating temperature. OPA656UB provides lower input bias current (1 pA) versus OPA656U (2 pA). OPA656U carries Last Time Buy status, indicating limited future availability. Both require MSL 3 (168 hours) moisture control. ROHS3 compliance and REACH unaffected certification apply.

Alternative Consideration: ISL28177FBZ-T7

ISL28177FBZ-T7 is a general-purpose amplifier from Renesas Electronics in 8-SOIC package with active product status. This part operates across 6V to 40V supply range and -40°C to 125°C temperature span, providing extended environmental capability. However, ISL28177FBZ-T7 exhibits significantly reduced performance: 0.2V/µs slew rate, 600 kHz gain bandwidth product, and 30 mA output current per channel. This part is suitable only for applications where high-speed performance is not required. MSL 1 (unlimited) and ROHS3 compliance apply.

Not Recommended: MCP6294T-E/SL

MCP6294T-E/SL is a four-circuit general-purpose amplifier in 14-SOIC package. Package incompatibility (14-SOIC versus 8-SOIC), multi-circuit configuration, and significantly reduced electrical performance (7V/µs slew rate, 10 MHz gain bandwidth product, 25 mA output current) make this part unsuitable as a direct substitute. This part is referenced only for applications requiring multi-channel integration with relaxed performance requirements.

Frequently Asked Questions (FAQ)

Q: Can AD9631ARZ be used as a direct replacement for AD9631AR without circuit modification?

A: Yes. AD9631ARZ maintains identical electrical specifications, package configuration, and pin assignment as AD9631AR. No circuit redesign is required. The primary difference is product status (active versus obsolete) and packaging format (tube versus unspecified).

Q: What is the key difference between OPA657UB and OPA657U?

A: Both parts are voltage feedback amplifiers with identical slew rate (700V/µs), gain bandwidth product (1.6 GHz), and -3dB bandwidth (350 MHz). OPA657UB provides superior input characteristics: input bias current of 1 pA (versus 2 pA in OPA657U) and input offset voltage of 100 µV (versus 250 µV in OPA657U). Both maintain 70 mA output current and 8V to 12V supply range.

Q: Why does OPA656U have Last Time Buy status?

A: Last Time Buy status indicates that Texas Instruments has announced end-of-life for this product. Existing inventory is available for purchase, but no new production is planned. OPA656UB, which maintains active status, is the recommended alternative.

Q: Can ISL28177FBZ-T7 replace AD9631AR in high-speed applications?

A: No. ISL28177FBZ-T7 is a general-purpose amplifier with 0.2V/µs slew rate and 600 kHz gain bandwidth product, which are substantially lower than AD9631AR specifications (1300V/µs slew rate, 320 MHz bandwidth). This part is suitable only for low-frequency applications where high-speed performance is not required.

Q: What is the significance of MSL rating 3 (168 hours) for OPA657UB and OPA656UB?

A: MSL 3 (168 hours) indicates that these parts must be stored in controlled moisture conditions and used within 168 hours of exposure to ambient humidity above 60% relative humidity at 30°C. Proper moisture control during storage, handling, and assembly is required to prevent solder joint reliability issues. MSL 1 (unlimited) parts such as AD9631ARZ and ISL28177FBZ-T7 have no moisture exposure restrictions.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed carry ROHS3 compliance certification. AD9631AR does not specify RoHS status. ROHS3 compliance ensures restriction of hazardous substances in accordance with EU Directive 2011/65/EU.

Q: What is the package compatibility consideration for MCP6294T-E/SL?

A: MCP6294T-E/SL is packaged in 14-SOIC (0.154", 3.90mm width), whereas AD9631AR and all recommended substitutes use 8-SOIC (0.154", 3.90mm width). The 14-SOIC package has different pin count and physical dimensions, requiring PCB redesign. Additionally, MCP6294T-E/SL integrates four amplifier circuits, whereas AD9631AR is a single-circuit device.

Q: Which substitute part offers the best performance improvement over AD9631AR?

A: OPA657UB and OPA657U deliver the highest performance improvement with 700V/µs slew rate (versus 1300V/µs in AD9631AR), 1.6 GHz gain bandwidth product, and 350 MHz -3dB bandwidth. OPA657UB additionally provides superior input offset voltage (100 µV) and lower input bias current (1 pA). These enhancements provide extended performance margins for high-speed signal conditioning applications.

Q: Can OPA657UB be used in applications originally designed for AD9631AR?

A: Yes, with consideration of MSL requirements. OPA657UB maintains compatible supply voltage range (8V to 12V, which overlaps with AD9631AR's 6V to 12V range), identical output current (70 mA), and matching operating temperature (-40°C to 85°C). The higher performance specifications of OPA657UB provide enhanced capability. However, OPA657UB requires MSL 3 (168 hours) moisture control, whereas AD9631AR requires only MSL 1 (unlimited) handling.

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