OPA656UBG4 Equivalent & Substitute Parts

Part Overview

The OPA656UBG4 is a voltage feedback amplifier manufactured by Texas Instruments, housed in an 8-SOIC package. This part is classified as obsolete, with 649 units currently in stock. The OPA656UBG4 delivers a gain bandwidth product of 230 MHz with a slew rate of 295 V/µs, designed for applications requiring single-circuit voltage feedback amplification across industrial and commercial temperature ranges (-40°C to 85°C). Due to its obsolete status, identifying functionally equivalent active alternatives is essential for design continuity and long-term supply chain reliability.

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	1	pA
Voltage - Input Offset	250	µV
Current - Supply	14	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 OPA656UBG4 is determined by strict alignment of electrical and mechanical parameters within the voltage feedback amplifier category. The primary substitution criteria are:

Package Compatibility: The OPA656UBG4 uses an 8-SOIC package. Direct substitutes must maintain this package form factor to ensure PCB layout compatibility without redesign.

Electrical Performance Envelope: Substitute parts must operate within the supply voltage range of 8 V to 12 V and maintain the operating temperature range of -40°C to 85°C. The slew rate (295 V/µs) and gain bandwidth product (230 MHz) define the performance baseline; substitutes with equal or superior specifications are acceptable.

Input Characteristics: The input bias current of 1 pA and input offset voltage of 250 µV establish the precision requirements. Substitutes with higher input bias current or offset voltage represent a trade-off in performance but remain functionally viable if application requirements permit.

Supply Current: The 14 mA supply current consumption is a reference point. Substitutes with lower supply current are preferred for power-constrained applications.

Compliance Requirements: All substitutes must maintain ROHS3 compliance and operate across the specified temperature range.

The substitute parts listed below are grouped into two categories: Texas Instruments OPA656 series variants (same base product family) and Analog Devices AD804x/AD963x series (alternative manufacturers with compatible electrical specifications and 8-SOIC packaging).

Parameter Comparison

Part Number	Manufacturer	Package	Slew Rate (V/µs)	GBW (MHz)	-3dB BW (MHz)	Input Bias (pA/µA)	Input Offset (µV/mV)	Supply Current (mA)	Supply Span (V)	Temp Range (°C)	Status
OPA656UBG4	Texas Instruments	8-SOIC	295	230	500	1 pA	250 µV	14	8–12	-40 to 85	Obsolete
OPA656NB/250	Texas Instruments	SOT-23-5	295	230	500	1 pA	250 µV	14	8–12	-40 to 85	Active
AD8047ARZ	Analog Devices	8-SOIC	750	—	250	1 µA	1 mV	5.8	6–12	-40 to 85	Active
AD8047ARZ-REEL7	Analog Devices	8-SOIC	750	—	250	1 µA	1 mV	5.8	6–12	-40 to 85	Active
AD8048ARZ	Analog Devices	8-SOIC	1000	—	260	1 µA	1 mV	5.9	6–12	-40 to 85	Active
AD8048ARZ-REEL7	Analog Devices	8-SOIC	1000	—	260	1 µA	1 mV	5.9	6–12	-40 to 85	Active
AD9631ARZ	Analog Devices	8-SOIC	1300	—	320	2 µA	3 mV	17	6–12	-40 to 85	Active
AD9631ARZ-REEL	Analog Devices	8-SOIC	1300	—	320	2 µA	3 mV	17	6–12	-40 to 85	Active
AD9631ARZ-REEL7	Analog Devices	8-SOIC	1300	—	320	2 µA	3 mV	17	6–12	-40 to 85	Active
AD9632ARZ	Analog Devices	8-SOIC	1500	—	250	2 µA	2 mV	16	6–12	-40 to 85	Active
AD9632ARZ-REEL7	Analog Devices	8-SOIC	1500	—	250	2 µA	2 mV	16	6–12	-40 to 85	Active

Engineering Selection Recommendations

Primary Substitute (Same Family): OPA656NB/250 is the recommended substitute from Texas Instruments. It maintains identical electrical specifications (295 V/µs slew rate, 230 MHz gain bandwidth product, 500 MHz -3dB bandwidth, 1 pA input bias current, 250 µV input offset voltage) and operates across the same supply voltage range (8 V to 12 V) and temperature range (-40°C to 85°C). The primary difference is packaging: OPA656NB/250 is available in SOT-23-5, requiring PCB layout modification. This part is active with 15,740 units in stock, ensuring long-term availability.

Alternative Substitutes (Analog Devices): The AD8047ARZ, AD8048ARZ, AD9631ARZ, and AD9632ARZ series provide active alternatives in 8-SOIC packaging, maintaining mechanical compatibility with the original OPA656UBG4. These parts operate across an extended supply voltage range (6 V to 12 V minimum), providing greater flexibility in power supply design. All alternatives maintain the -40°C to 85°C operating temperature range and ROHS3 compliance.

Performance Trade-offs:

AD8047ARZ and AD8047ARZ-REEL7 deliver 750 V/µs slew rate with 250 MHz -3dB bandwidth and lower supply current (5.8 mA). Input bias current increases to 1 µA and input offset voltage to 1 mV, representing a trade-off in precision for reduced power consumption.

AD8048ARZ and AD8048ARZ-REEL7 provide 1000 V/µs slew rate with 260 MHz -3dB bandwidth and 5.9 mA supply current. These specifications exceed the OPA656UBG4 baseline, suitable for applications requiring higher slew rate performance.

AD9631ARZ, AD9631ARZ-REEL, and AD9631ARZ-REEL7 deliver the highest slew rate (1300 V/µs) and -3dB bandwidth (320 MHz) among substitutes, with 17 mA supply current. Input bias current is 2 µA and input offset voltage is 3 mV.

AD9632ARZ and AD9632ARZ-REEL7 provide 1500 V/µs slew rate with 250 MHz -3dB bandwidth, 16 mA supply current, 2 µA input bias current, and 2 mV input offset voltage.

Compliance and Availability: All substitute parts maintain ROHS3 compliance and are classified as active products with substantial inventory levels, ensuring supply chain continuity. Moisture sensitivity levels for Analog Devices parts are MSL 1 (Unlimited), compared to MSL 3 (168 Hours) for the original OPA656UBG4, providing improved handling flexibility during manufacturing.

Frequently Asked Questions (FAQ)

Q: Can OPA656NB/250 replace OPA656UBG4 directly on the PCB?

A: OPA656NB/250 has identical electrical specifications but uses SOT-23-5 packaging instead of 8-SOIC. Direct PCB replacement is not possible without layout modification. However, the electrical performance is equivalent, making it suitable for new designs or redesigned boards.

Q: What is the key difference between OPA656UBG4 and AD8047ARZ?

A: Both use 8-SOIC packaging and operate across overlapping temperature ranges. AD8047ARZ has higher slew rate (750 V/µs vs. 295 V/µs) and lower supply current (5.8 mA vs. 14 mA), but higher input bias current (1 µA vs. 1 pA) and input offset voltage (1 mV vs. 250 µV). Selection depends on whether precision or slew rate performance is prioritized.

Q: Are AD9631ARZ and AD9632ARZ interchangeable?

A: Both parts use 8-SOIC packaging and operate across -40°C to 85°C. AD9632ARZ has higher slew rate (1500 V/µs vs. 1300 V/µs) but lower -3dB bandwidth (250 MHz vs. 320 MHz) and lower supply current (16 mA vs. 17 mA). Selection depends on application bandwidth requirements.

Q: What does the "-REEL7" suffix indicate?

A: The "-REEL7" suffix denotes Cut Tape (CT) and Digi-Reel packaging format, as opposed to standard tube packaging. Electrical specifications are identical; the suffix indicates packaging and delivery format only.

Q: Can I use AD8048ARZ in a circuit designed for OPA656UBG4?

A: AD8048ARZ is mechanically compatible (8-SOIC package) and operates across the same temperature range. It has superior slew rate (1000 V/µs vs. 295 V/µs) and comparable -3dB bandwidth (260 MHz vs. 500 MHz). The extended supply voltage range (6 V to 12 V) provides additional design flexibility. Verification of input bias current and offset voltage tolerance is required for precision-critical applications.

Q: Which substitute offers the lowest power consumption?

A: AD8047ARZ and AD8047ARZ-REEL7 have the lowest supply current at 5.8 mA, compared to 14 mA for OPA656UBG4. This represents a 59% reduction in supply current, beneficial for battery-powered or power-constrained applications.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, meeting environmental and regulatory requirements equivalent to the original OPA656UBG4.

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