OPA657UB Equivalent & Substitute Parts

Part Overview

The OPA657UB is a voltage feedback amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This single-circuit linear amplifier is classified as Active product status and is ROHS3 compliant. The OPA657UB delivers high-speed amplification with a 1.6 GHz gain bandwidth product and 700V/µs slew rate, suitable for applications requiring wideband signal conditioning and high-frequency amplification. Substitute parts are necessary when the OPA657UB reaches end-of-life status, inventory constraints occur, or alternative performance characteristics better match specific application requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	OPA657UB	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	1	—
Slew Rate	700	V/µs
Gain Bandwidth Product	1.6	GHz
-3dB Bandwidth	350	MHz
Current - Input Bias	1	pA
Voltage - Input Offset	100	µV
Current - Supply	14	mA
Current - Output / Channel	70	mA
Voltage - Supply Span (Min)	8	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	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	3 (168 Hours)	—

Substitute Part Grouping Explanation

Substitution of the OPA657UB is determined by strict adherence to the following electrical and mechanical parameters:

Mandatory Compatibility Criteria:

Amplifier Type: Voltage Feedback (all substitutes must match)
Number of Circuits: 1 (all substitutes must match)
Package / Case: 8-SOIC (0.154", 3.90mm Width) (all substitutes must match)
Mounting Type: Surface Mount (all substitutes must match)
Operating Temperature Range: -40°C to 85°C (all substitutes must match)
Voltage - Supply Span: Minimum 8V to Maximum 12V (substitute range must encompass or overlap)

Performance Parameters Defining Substitution Groups:

The OPA657UB substitute parts are grouped into three categories based on slew rate and bandwidth performance:

Group 1 - Lower Performance (AD8047ARZ, AD8047ARZ-REEL7): Slew rate 750V/µs, -3dB bandwidth 250 MHz. These parts operate within the OPA657UB supply voltage range (6V to 12V minimum/maximum) and maintain the same package and circuit count. Lower input bias current (1 µA vs. 1 pA) and higher input offset voltage (1 mV vs. 100 µV) characterize this group.

Group 2 - Mid-Range Performance (AD8048ARZ): Slew rate 1000V/µs, -3dB bandwidth 260 MHz. This part exceeds OPA657UB slew rate performance while maintaining compatible supply voltage range and package specifications.

Group 3 - Higher Performance (AD9631ARZ, AD9631ARZ-REEL7, AD9632ARZ, AD9632ARZ-REEL7): Slew rates ranging from 1300V/µs to 1500V/µs with -3dB bandwidths of 250 MHz to 320 MHz. These parts deliver enhanced performance metrics while maintaining electrical and mechanical compatibility.

All substitute parts are ROHS3 compliant, Active product status, and operate across the -40°C to 85°C temperature range.

Parameter Comparison

Parameter	OPA657UB	AD8047ARZ	AD8047ARZ-REEL7	AD8048ARZ	AD9631ARZ	AD9631ARZ-REEL7	AD9632ARZ	AD9632ARZ-REEL7	Unit
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	—
Number of Circuits	1	1	1	1	1	1	1	1	—
Slew Rate	700	750	750	1000	1300	1300	1500	1500	V/µs
-3dB Bandwidth	350	250	250	260	320	320	250	250	MHz
Current - Input Bias	1	1	1	1	2	2	2	2	µA
Voltage - Input Offset	100	1	1	1	3	3	2	2	µV
Current - Supply	14	5.8	5.8	5.9	17	17	16	16	mA
Current - Output / Channel	70	50	50	50	70	70	70	70	mA
Voltage - Supply Span (Min)	8	6	6	6	6	6	6	6	V
Voltage - Supply Span (Max)	12	12	12	12	12	12	12	12	V
Operating Temperature	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the OPA657UB. The selection of an appropriate substitute depends on application-specific performance requirements within the established electrical and mechanical compatibility framework.

AD8047ARZ and AD8047ARZ-REEL7 (Analog Devices Inc.): These parts operate at lower slew rate (750V/µs) and reduced -3dB bandwidth (250 MHz) compared to the OPA657UB. Supply current is reduced to 5.8 mA. Output current capability is 50 mA versus 70 mA on the OPA657UB. Packaging options include Tube (AD8047ARZ) and Cut Tape & Digi-Reel (AD8047ARZ-REEL7). Moisture sensitivity is improved to MSL 1 (Unlimited). These parts are suitable for applications where lower bandwidth and reduced power consumption are acceptable trade-offs.

AD8048ARZ (Analog Devices Inc.): This part provides intermediate performance with 1000V/µs slew rate and 260 MHz -3dB bandwidth. Supply current is 5.9 mA with 50 mA output current capability. Tube packaging is provided. MSL rating is 1 (Unlimited). This part bridges performance between lower-tier and higher-tier substitutes.

AD9631ARZ and AD9631ARZ-REEL7 (Analog Devices Inc.): These parts deliver enhanced slew rate (1300V/µs) and -3dB bandwidth (320 MHz), exceeding OPA657UB performance. Supply current increases to 17 mA with 70 mA output current capability matching the OPA657UB. Packaging options include Tube (AD9631ARZ) and Cut Tape & Digi-Reel (AD9631ARZ-REEL7). MSL rating is 1 (Unlimited). These parts are suitable for applications requiring higher bandwidth performance.

AD9632ARZ and AD9632ARZ-REEL7 (Analog Devices Inc.): These parts provide the highest slew rate (1500V/µs) among substitutes with 250 MHz -3dB bandwidth. Supply current is 16 mA with 70 mA output current capability. Packaging options include Tube (AD9632ARZ) and Cut Tape & Digi-Reel (AD9632ARZ-REEL7). MSL rating is 1 (Unlimited). These parts are suitable for applications requiring maximum slew rate performance.

All substitute parts are manufactured by Analog Devices Inc., ensuring consistent quality and support infrastructure. Packaging format selection (Tube versus Cut Tape & Digi-Reel) depends on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: What are the mandatory compatibility requirements for substituting the OPA657UB?

A: The substitute part must maintain the following specifications: Voltage Feedback amplifier type, single circuit configuration, 8-SOIC surface mount package (0.154", 3.90mm width), and -40°C to 85°C operating temperature range. Supply voltage range must support the OPA657UB operating window of 8V to 12V.

Q: Can I use AD8047ARZ as a direct replacement for OPA657UB?

A: AD8047ARZ is electrically and mechanically compatible with OPA657UB. However, performance differs: slew rate is 750V/µs (versus 700V/µs), -3dB bandwidth is 250 MHz (versus 350 MHz), and output current is 50 mA (versus 70 mA). Supply current is lower at 5.8 mA. These differences must be evaluated against application requirements.

Q: What is the difference between AD9631ARZ and AD9631ARZ-REEL7?

A: Both parts are electrically identical with 1300V/µs slew rate and 320 MHz -3dB bandwidth. The primary difference is packaging format: AD9631ARZ is supplied in Tube packaging, while AD9631ARZ-REEL7 is supplied in Cut Tape & Digi-Reel format. Selection depends on procurement and assembly line requirements.

Q: How do the input bias current specifications affect substitution?

A: The OPA657UB has 1 pA input bias current, while all Analog Devices substitutes have 1 µA input bias current. This 1000-fold difference may affect circuit performance in high-impedance applications. Applications with input impedances below 1 MΩ typically experience negligible impact.

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

A: The OPA657UB has MSL 3 (168 hours), while all substitutes have MSL 1 (Unlimited). MSL 1 provides superior moisture resistance and longer shelf life without baking requirements. This represents an improvement in handling and storage characteristics.

Q: Can I substitute OPA657UB with AD9632ARZ for higher slew rate applications?

A: Yes, AD9632ARZ is mechanically and electrically compatible with OPA657UB and provides 1500V/µs slew rate (versus 700V/µs). However, -3dB bandwidth is 250 MHz (versus 350 MHz). This trade-off must be evaluated for specific application requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts (AD8047ARZ, AD8047ARZ-REEL7, AD8048ARZ, AD9631ARZ, AD9631ARZ-REEL7, AD9632ARZ, AD9632ARZ-REEL7) are ROHS3 compliant and maintain Active product status.

Q: What supply voltage range is supported by substitute parts?

A: All substitute parts support 6V to 12V supply voltage range, which encompasses the OPA657UB requirement of 8V to 12V. Designs operating at 6V to 8V supply voltage can use substitutes but not the original OPA657UB.

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