OPA656UG4 Equivalent & Substitute Parts

Part Overview

The OPA656UG4 is a voltage feedback amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. The OPA656UG4 delivers a gain bandwidth product of 230 MHz with a slew rate of 295 V/µs, making it suitable for high-speed signal conditioning applications. Due to its obsolete status, alternative parts with compatible electrical and mechanical specifications are required for new designs and inventory replenishment.

Key Parameters

Parameter	Value	Unit
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 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 OPA656UG4 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters for Substitution:

Amplifier Type: Voltage Feedback
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C to 85°C
Gain Bandwidth Product: 230 MHz (minimum acceptable)
Slew Rate: 295 V/µs (minimum acceptable)
Supply Voltage Range: 8 V to 12 V (minimum acceptable)
Current - Output / Channel: 70 mA (minimum acceptable)

Grouping Logic:

Group 1: Texas Instruments OPA656 Series (Direct Parametric Equivalents) Parts OPA656UB and OPA656U maintain identical electrical specifications to the OPA656UG4 across all critical parameters. These components differ only in packaging format (Tube vs. Cut Tape & Digi-Reel) and product status (Last Time Buy vs. Obsolete). Both are housed in the same 8-SOIC package and support the identical supply voltage range and operating temperature specifications.

Group 2: Analog Devices Voltage Feedback Amplifiers (Functional Equivalents with Enhanced Performance) Parts AD8047ARZ, AD8047ARZ-REEL7, AD8048ARZ, AD8048ARZ-REEL7, AD9631ARZ, AD9631ARZ-REEL, and AD9631ARZ-REEL7 are voltage feedback amplifiers in 8-SOIC packages with active product status. These devices exceed the OPA656UG4 specifications in slew rate and bandwidth performance while maintaining compatible supply voltage ranges and operating temperatures. The AD8047 series provides 750 V/µs slew rate; the AD8048 series provides 1000 V/µs slew rate; the AD9631 series provides 1300 V/µs slew rate.

Group 3: Analog Devices Transimpedance Amplifier (Functional Alternative) Part AD8015ARZ is a transimpedance amplifier with differential output, representing a functional alternative for applications requiring transimpedance topology. This device operates within compatible supply voltage and temperature ranges but differs in amplifier type and output configuration.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	Gain Bandwidth Product (MHz)	-3dB Bandwidth (MHz)	Current - Supply (mA)	Current - Output / Channel (mA)	Voltage - Supply Span Min (V)	Voltage - Supply Span Max (V)	Package / Case	Product Status	Inventory (Pcs)
OPA656UG4	Texas Instruments	Voltage Feedback	295	230	500	14	70	8	12	8-SOIC	Obsolete	694
OPA656UB	Texas Instruments	Voltage Feedback	295	230	500	14	70	8	12	8-SOIC	Last Time Buy	1866
OPA656U	Texas Instruments	Voltage Feedback	295	230	500	14	70	8	12	8-SOIC	Last Time Buy	3565
AD8047ARZ	Analog Devices Inc.	Voltage Feedback	750	—	250	5.8	50	6	12	8-SOIC	Active	3957
AD8047ARZ-REEL7	Analog Devices Inc.	Voltage Feedback	750	—	250	5.8	50	6	12	8-SOIC	Active	2400
AD8048ARZ	Analog Devices Inc.	Voltage Feedback	1000	—	260	5.9	50	6	12	8-SOIC	Active	4632
AD8048ARZ-REEL7	Analog Devices Inc.	Voltage Feedback	1000	—	260	5.9	50	6	12	8-SOIC	Active	15400
AD9631ARZ	Analog Devices Inc.	Voltage Feedback	1300	—	320	17	70	6	12	8-SOIC	Active	4977
AD9631ARZ-REEL	Analog Devices Inc.	Voltage Feedback	1300	—	320	17	70	6	12	8-SOIC	Active	2801
AD9631ARZ-REEL7	Analog Devices Inc.	Voltage Feedback	1300	—	320	17	70	6	12	8-SOIC	Active	18321
AD8015ARZ	Analog Devices Inc.	Transimpedance	—	240	—	25	—	4.5	11	8-SOIC	Active	5300

Engineering Selection Recommendations

Primary Substitutes (Direct Parametric Equivalents):

OPA656UB and OPA656U are direct parametric equivalents to the OPA656UG4. Both maintain identical electrical specifications and are housed in the same 8-SOIC package. Selection between these two should be based on packaging requirements: OPA656UB is supplied in Tube packaging, while OPA656U is supplied in Tube packaging. Both devices carry Last Time Buy status, indicating limited future availability. OPA656U offers higher inventory levels (3565 pcs) compared to OPA656UB (1866 pcs).

Secondary Substitutes (Enhanced Performance Alternatives):

The Analog Devices AD8047ARZ, AD8048ARZ, and AD9631ARZ series represent active product alternatives with enhanced performance characteristics. These devices maintain voltage feedback topology and 8-SOIC packaging with compatible operating temperature ranges. The AD8047 series operates with reduced supply current (5.8 mA) and lower output current capability (50 mA) compared to the OPA656UG4. The AD8048 series provides increased slew rate (1000 V/µs) with similar supply current characteristics. The AD9631 series delivers the highest slew rate (1300 V/µs) and maintains the OPA656UG4 output current specification (70 mA), though with increased supply current (17 mA).

All Analog Devices alternatives carry Active product status with ROHS3 compliance and MSL 1 rating, indicating superior long-term availability and lower moisture sensitivity compared to the OPA656UG4. Packaging variants (Tube, Tape & Reel, Cut Tape & Digi-Reel) are available across the AD8047, AD8048, and AD9631 product lines.

Functional Alternative:

AD8015ARZ is a transimpedance amplifier with differential output topology, suitable for applications requiring transimpedance configuration. This device operates within compatible supply voltage ranges (4.5 V to 11 V) and temperature specifications but differs fundamentally in amplifier type and output configuration. Selection of this device requires circuit topology compatibility verification.

Frequently Asked Questions (FAQ)

Q: Can OPA656UB or OPA656U be used as direct replacements for OPA656UG4?

A: Yes. OPA656UB and OPA656U are parametric equivalents with identical electrical specifications across all critical parameters including slew rate, gain bandwidth product, supply voltage range, and output current capability. Both are housed in the same 8-SOIC package and support the identical operating temperature range. Substitution requires no circuit modifications.

Q: What are the key differences between the Texas Instruments OPA656 series and Analog Devices alternatives?

A: The OPA656UB and OPA656U maintain identical electrical specifications to the OPA656UG4. Analog Devices alternatives (AD8047, AD8048, AD9631) offer enhanced slew rate performance (750 V/µs to 1300 V/µs versus 295 V/µs) and active product status. The AD8047 and AD8048 series feature reduced output current capability (50 mA versus 70 mA). The AD9631 series maintains 70 mA output current with increased supply current (17 mA). All Analog Devices devices carry MSL 1 rating versus MSL 3 for the OPA656 series.

Q: Are packaging variants interchangeable?

A: Packaging variants (Tube, Tape & Reel, Cut Tape & Digi-Reel) are interchangeable from an electrical and mechanical standpoint. All variants of a given part number (e.g., AD8048ARZ and AD8048ARZ-REEL7) are housed in identical 8-SOIC packages and deliver identical electrical performance. Selection should be based on assembly process requirements and inventory management practices.

Q: What is the significance of "Last Time Buy" and "Active" product status?

A: "Last Time Buy" status indicates that the manufacturer has announced end-of-life for the product, with limited future availability. "Active" status indicates ongoing production and long-term availability. For new designs and long-term production requirements, selection of Active status devices (Analog Devices alternatives) is recommended to ensure supply continuity.

Q: Can AD8047ARZ or AD8048ARZ be used in applications requiring 70 mA output current?

A: AD8047ARZ and AD8048ARZ are rated for 50 mA output current per channel, which is below the OPA656UG4 specification of 70 mA. These devices are suitable only for applications requiring output current up to 50 mA. For applications requiring 70 mA output current, AD9631ARZ series devices maintain this specification.

Q: What is the moisture sensitivity level (MSL) significance?

A: The OPA656UG4 carries MSL 3 rating (168 hours floor life), while Analog Devices alternatives carry MSL 1 rating (unlimited floor life). MSL 3 devices require more stringent moisture control during storage and handling. MSL 1 devices offer superior shelf life and reduced risk of moisture-induced failures during assembly processes.

Q: Is AD8015ARZ a suitable substitute for OPA656UG4?

A: AD8015ARZ is a transimpedance amplifier with differential output, fundamentally different from the voltage feedback topology of OPA656UG4. This device is suitable only for applications specifically requiring transimpedance configuration. Circuit topology compatibility must be verified before selection.

Q: What supply voltage range compatibility exists across substitute parts?

A: The OPA656UG4 operates with 8 V to 12 V supply span. OPA656UB and OPA656U maintain identical 8 V to 12 V range. Analog Devices alternatives (AD8047, AD8048, AD9631) operate with 6 V to 12 V range, providing extended lower voltage capability. AD8015ARZ operates with 4.5 V to 11 V range. All devices support the OPA656UG4 supply voltage window.

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