OPA656U/2K5 Equivalent & Substitute Parts

Part Overview

The OPA656U/2K5 is a voltage feedback amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as a Last Time Buy product, indicating discontinued production status. The OPA656U/2K5 delivers a gain bandwidth product of 230 MHz with a slew rate of 295 V/µs, suitable for applications requiring moderate-speed signal conditioning and amplification. Due to its Last Time Buy status, identifying functionally equivalent substitute parts is necessary for design continuity and long-term supply chain planning.

Key Parameters

Parameter	OPA656U/2K5
Amplifier Type	Voltage Feedback
Number of Circuits	1
Slew Rate	295 V/µs
Gain Bandwidth Product	230 MHz
-3dB Bandwidth	500 MHz
Current - Input Bias	2 pA
Voltage - Input Offset	250 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°C to 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the OPA656U/2K5 is determined by the following critical parameters: package type (8-SOIC surface mount), operating temperature range (-40°C to 85°C), supply voltage compatibility (minimum 8 V to maximum 12 V), and functional classification as a voltage feedback amplifier with single circuit configuration. Substitute parts must maintain the same physical footprint and mounting technology to ensure PCB compatibility without redesign.

The substitute parts are grouped into two categories based on electrical performance characteristics:

Category 1: Direct Performance Match Parts with equivalent or superior slew rate (≥295 V/µs), gain bandwidth product (≥230 MHz), and -3dB bandwidth (≥500 MHz) while maintaining compatible supply voltage ranges and operating temperature specifications.

Category 2: Enhanced Performance Alternatives Parts with higher slew rates and bandwidth specifications that provide improved performance margins while maintaining backward compatibility in supply voltage and temperature operating ranges.

All substitute parts listed are Active status products with ROHS3 compliance and REACH Unaffected designation, ensuring regulatory compliance and supply availability.

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	Gain Bandwidth Product (MHz)	-3dB Bandwidth (MHz)	Current - Input Bias	Voltage - Input Offset	Current - Supply (mA)	Current - Output / Channel (mA)	Voltage - Supply Span Min (V)	Voltage - Supply Span Max (V)	Operating Temperature	Package	Product Status
OPA656U/2K5	Texas Instruments	295	230	500	2 pA	250 µV	14	70	8	12	-40°C to 85°C	8-SOIC	Last Time Buy
OPA656UB/2K5	Texas Instruments	295	230	500	1 pA	250 µV	14	—	8	12	-40°C to 85°C	8-SOIC	Active
AD8047ARZ	Analog Devices Inc.	750	—	250	1 µA	1 mV	5.8	50	6	12	-40°C to 85°C	8-SOIC	Active
AD8047ARZ-REEL7	Analog Devices Inc.	750	—	250	1 µA	1 mV	5.8	50	6	12	-40°C to 85°C	8-SOIC	Active
AD8048ARZ	Analog Devices Inc.	1000	—	260	1 µA	1 mV	5.9	50	6	12	-40°C to 85°C	8-SOIC	Active
AD8048ARZ-REEL7	Analog Devices Inc.	1000	—	260	1 µA	1 mV	5.9	50	6	12	-40°C to 85°C	8-SOIC	Active
AD9631ARZ	Analog Devices Inc.	1300	—	320	2 µA	3 mV	17	70	6	12	-40°C to 85°C	8-SOIC	Active
AD9631ARZ-REEL	Analog Devices Inc.	1300	—	320	2 µA	3 mV	17	70	6	12	-40°C to 85°C	8-SOIC	Active
AD9631ARZ-REEL7	Analog Devices Inc.	1300	—	320	2 µA	3 mV	17	70	6	12	-40°C to 85°C	8-SOIC	Active
AD9632ARZ	Analog Devices Inc.	1500	—	250	2 µA	2 mV	16	70	6	12	-40°C to 85°C	8-SOIC	Active
AD9632ARZ-REEL7	Analog Devices Inc.	1500	—	250	2 µA	2 mV	16	70	6	12	-40°C to 85°C	8-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: OPA656UB/2K5

The OPA656UB/2K5 from Texas Instruments is the direct successor to the OPA656U/2K5. This part maintains identical electrical performance specifications including 295 V/µs slew rate, 230 MHz gain bandwidth product, and 500 MHz -3dB bandwidth. The OPA656UB/2K5 features improved input bias current (1 pA versus 2 pA) and carries Active product status, ensuring continued availability and manufacturing support. Supply voltage range (8 V to 12 V) and operating temperature specifications (-40°C to 85°C) are identical. This part is the optimal choice for direct replacement in existing designs.

Secondary Recommendations: AD8047ARZ / AD8047ARZ-REEL7

The AD8047 series from Analog Devices Inc. provides enhanced slew rate performance (750 V/µs) while maintaining compatible supply voltage and temperature ranges. The -3dB bandwidth of 250 MHz is lower than the OPA656U/2K5 specification. These parts are suitable for applications where higher slew rate is beneficial and bandwidth requirements do not exceed 250 MHz. Both tube and reel packaging options are available.

Tertiary Recommendations: AD8048ARZ / AD8048ARZ-REEL7

The AD8048 series delivers 1000 V/µs slew rate with 260 MHz -3dB bandwidth. These parts are appropriate for designs requiring significantly higher slew rate performance while maintaining the same package footprint and operating temperature range. Supply voltage compatibility extends to 6 V minimum, providing additional flexibility.

Enhanced Performance Options: AD9631 and AD9632 Series

The AD9631 series (1300 V/µs slew rate, 320 MHz -3dB bandwidth) and AD9632 series (1500 V/µs slew rate, 250 MHz -3dB bandwidth) represent the highest performance alternatives. These parts maintain 70 mA output current capability matching the original specification and support the full operating temperature range. Multiple packaging options (tube, tape & reel, cut tape & digi-reel) are available. These parts are suitable for applications requiring maximum performance headroom.

All recommended substitute parts are ROHS3 compliant, REACH Unaffected, and carry Active product status, ensuring regulatory compliance and long-term supply availability.

Frequently Asked Questions (FAQ)

Q: Can OPA656UB/2K5 be used as a direct replacement for OPA656U/2K5?

A: Yes. The OPA656UB/2K5 maintains identical slew rate (295 V/µs), gain bandwidth product (230 MHz), -3dB bandwidth (500 MHz), supply voltage range (8 V to 12 V), and operating temperature range (-40°C to 85°C). The OPA656UB/2K5 features lower input bias current (1 pA) and carries Active product status. No circuit modifications are required.

Q: What is the primary difference between OPA656U/2K5 and the AD8047/AD8048 series?

A: The OPA656U/2K5 provides 230 MHz gain bandwidth product and 500 MHz -3dB bandwidth with 295 V/µs slew rate. The AD8047 series offers 750 V/µs slew rate but reduced -3dB bandwidth (250 MHz). The AD8048 series provides 1000 V/µs slew rate with 260 MHz -3dB bandwidth. Selection depends on whether bandwidth or slew rate performance is the primary design constraint.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. All substitute parts listed are housed in 8-SOIC (0.154", 3.90mm width) surface mount packages. PCB footprints are identical, eliminating the need for layout modifications.

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

A: Both parts are electrically identical with 1300 V/µs slew rate and 320 MHz -3dB bandwidth. The primary difference is packaging: AD9631ARZ is supplied in tube packaging, while AD9631ARZ-REEL7 is supplied in cut tape and digi-reel format. Selection depends on assembly process requirements and inventory management preferences.

Q: Can AD9631 or AD9632 parts be used in place of OPA656U/2K5?

A: Yes, with design verification. The AD9631 and AD9632 series maintain compatible supply voltage (6 V to 12 V minimum, exceeding the 8 V requirement) and operating temperature ranges (-40°C to 85°C). Both provide superior slew rate performance (1300 V/µs and 1500 V/µs respectively) and 70 mA output current matching the original specification. The -3dB bandwidth of AD9631 (320 MHz) exceeds the original specification, while AD9632 (250 MHz) is lower. Circuit performance should be validated for the specific application.

Q: What is the significance of the Last Time Buy status for OPA656U/2K5?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part. Existing inventory will be depleted without replenishment. Designs currently using OPA656U/2K5 should transition to OPA656UB/2K5 or alternative parts to ensure long-term supply continuity.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification and REACH Unaffected designation, meeting current environmental and regulatory requirements.

Q: What is the difference in input bias current between OPA656U/2K5 and substitute parts?

A: The OPA656U/2K5 specifies 2 pA input bias current. The OPA656UB/2K5 improves this to 1 pA. The AD8047 and AD8048 series specify 1 µA input bias current. The AD9631 and AD9632 series specify 2 µA input bias current. Applications with high-impedance input sources should account for these differences in circuit design.

Q: What is the difference in input offset voltage between OPA656U/2K5 and substitute parts?

A: The OPA656U/2K5 specifies 250 µV input offset voltage. The OPA656UB/2K5 maintains this specification. The AD8047 and AD8048 series specify 1 mV input offset voltage. The AD9631 series specifies 3 mV, while AD9632 specifies 2 mV. Applications requiring precision DC amplification should account for these differences.

Q: Can substitute parts operate at the minimum 8 V supply voltage specified for OPA656U/2K5?

A: The OPA656UB/2K5 operates at 8 V minimum. The AD8047, AD8048, AD9631, and AD9632 series all specify 6 V minimum supply voltage, providing additional operating margin below the original specification. All parts support the 12 V maximum supply voltage.

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