OPA656U Equivalent & Substitute Parts

Part Overview

The OPA656U is a voltage feedback amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The OPA656U delivers 230 MHz gain bandwidth product with 295 V/µs slew rate, designed for high-speed signal conditioning applications requiring single-circuit voltage feedback amplification. Identification of equivalent and substitute parts is necessary due to product discontinuation and the need for long-term design continuity and supply chain alternatives.

Key Parameters

Parameter	OPA656U 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

Substitute parts for the OPA656U are classified based on strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

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

Secondary Compatibility Parameters:

Slew Rate: 295 V/µs or greater
Gain Bandwidth Product: 230 MHz or greater
-3dB Bandwidth: 500 MHz or greater
Current - Input Bias: 2 pA or lower
Voltage - Input Offset: 250 µV or lower
Current - Supply: 14 mA or lower
Current - Output / Channel: 70 mA or greater

Substitutes are grouped into two categories: Texas Instruments OPA656 series variants (direct parametric equivalents) and Analog Devices voltage feedback amplifiers (functional alternatives meeting or exceeding performance specifications).

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	-3dB BW (MHz)	Input Bias (pA/µA)	Supply Current (mA)	Output Current (mA)	Supply Span (V)	Package	Status
OPA656U	Texas Instruments	Voltage Feedback	295	230	500	2 pA	14	70	8–12	8-SOIC	Last Time Buy
OPA656UB/2K5	Texas Instruments	Voltage Feedback	295	230	500	1 pA	14	—	8–12	8-SOIC	Active
OPA656UB	Texas Instruments	Voltage Feedback	295	230	500	1 pA	14	70	8–12	8-SOIC	Last Time Buy
AD8047ARZ	Analog Devices Inc.	Voltage Feedback	750	—	250	1 µA	5.8	50	6–12	8-SOIC	Active
AD8047ARZ-REEL7	Analog Devices Inc.	Voltage Feedback	750	—	250	1 µA	5.8	50	6–12	8-SOIC	Active
AD8048ARZ	Analog Devices Inc.	Voltage Feedback	1000	—	260	1 µA	5.9	50	6–12	8-SOIC	Active
AD8048ARZ-REEL7	Analog Devices Inc.	Voltage Feedback	1000	—	260	1 µA	5.9	50	6–12	8-SOIC	Active
AD9631ARZ	Analog Devices Inc.	Voltage Feedback	1300	—	320	2 µA	17	70	6–12	8-SOIC	Active
AD9631ARZ-REEL	Analog Devices Inc.	Voltage Feedback	1300	—	320	2 µA	17	70	6–12	8-SOIC	Active
AD9631ARZ-REEL7	Analog Devices Inc.	Voltage Feedback	1300	—	320	2 µA	17	70	6–12	8-SOIC	Active
AD8015ARZ-REEL7	Analog Devices Inc.	Transimpedance	—	240	—	—	25	—	4.5–11	8-SOIC	Active

Engineering Selection Recommendations

Direct Parametric Equivalents (Texas Instruments OPA656 Series):

OPA656UB/2K5 and OPA656UB are direct parametric equivalents to OPA656U. Both maintain identical electrical specifications for slew rate (295 V/µs), gain bandwidth product (230 MHz), and -3dB bandwidth (500 MHz). OPA656UB/2K5 is classified as Active product status, providing superior long-term supply availability compared to the Last Time Buy status of OPA656U. OPA656UB exhibits improved input bias current (1 pA versus 2 pA), reducing input offset drift in precision applications. Both parts are ROHS3 Compliant and REACH Unaffected, maintaining regulatory compliance equivalence.

Functional Alternatives (Analog Devices Voltage Feedback Amplifiers):

AD8048ARZ and AD8048ARZ-REEL7 provide enhanced performance with 1000 V/µs slew rate and 260 MHz -3dB bandwidth, exceeding OPA656U specifications. These parts are Active status with unlimited MSL rating (1), offering superior moisture resistance. Supply current is reduced to 5.9 mA, providing power efficiency benefits. Output current capability (50 mA) is lower than OPA656U (70 mA), requiring circuit design verification for high-load applications.

AD9631ARZ, AD9631ARZ-REEL, and AD9631ARZ-REEL7 deliver maximum performance with 1300 V/µs slew rate and 320 MHz -3dB bandwidth. Output current matches OPA656U specification (70 mA). Supply current increases to 17 mA, and input bias current rises to 2 µA. These parts are suitable for applications requiring maximum bandwidth and slew rate performance.

AD8047ARZ and AD8047ARZ-REEL7 provide intermediate performance with 750 V/µs slew rate and 250 MHz -3dB bandwidth. Supply current is minimized at 5.8 mA, suitable for power-constrained applications. Output current is limited to 50 mA.

All substitute parts maintain 8-SOIC package compatibility, surface mount mounting type, and -40°C to 85°C operating temperature range. All are ROHS3 Compliant and REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can OPA656UB/2K5 directly replace OPA656U in existing designs?

A: Yes. OPA656UB/2K5 maintains identical electrical performance specifications (295 V/µs slew rate, 230 MHz gain bandwidth product, 500 MHz -3dB bandwidth) and identical 8-SOIC package dimensions. Input bias current improvement (1 pA versus 2 pA) is beneficial for precision applications. No circuit redesign is required. OPA656UB/2K5 is Active status, providing superior supply continuity.

Q: What are the key differences between Texas Instruments OPA656 variants and Analog Devices substitutes?

A: Texas Instruments OPA656UB/2K5 and OPA656UB are parametric equivalents with identical bandwidth and slew rate specifications. Analog Devices AD8048ARZ and AD9631ARZ series offer enhanced slew rate (1000 V/µs and 1300 V/µs respectively) and higher -3dB bandwidth (260 MHz and 320 MHz). Analog Devices parts feature lower supply current and improved moisture sensitivity rating (MSL 1 versus MSL 3). Output current capability varies: OPA656U and AD9631 series deliver 70 mA; AD8047 and AD8048 series deliver 50 mA.

Q: Are packaging and mounting considerations identical across all substitutes?

A: All substitute parts use 8-SOIC (0.154", 3.90mm Width) surface mount package, maintaining PCB layout compatibility with OPA656U. Packaging format differs: OPA656U and OPA656UB are supplied in Tube; OPA656UB/2K5 packaging is unspecified; AD8047ARZ and AD9631ARZ are supplied in Tube; AD8047ARZ-REEL7, AD8048ARZ-REEL7, AD9631ARZ-REEL, and AD9631ARZ-REEL7 are supplied in Cut Tape (CT) & Digi-Reel® or Tape & Reel (TR) formats. Verify packaging format compatibility with assembly process requirements.

Q: Which substitute part is recommended for power-constrained applications?

A: AD8047ARZ and AD8047ARZ-REEL7 deliver minimum supply current at 5.8 mA, compared to OPA656U at 14 mA. AD8048ARZ and AD8048ARZ-REEL7 provide 5.9 mA supply current with enhanced slew rate (1000 V/µs). Both options reduce power dissipation. Output current capability is limited to 50 mA; verify load requirements before selection.

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

A: Last Time Buy status indicates Texas Instruments has discontinued production. OPA656U inventory is limited (3565 Pcs reported). OPA656UB/2K5 (Active status, 3200 Pcs) and OPA656UB (Last Time Buy, 1866 Pcs) provide near-term alternatives. For long-term supply security, Analog Devices AD8048ARZ-REEL7 (15400 Pcs) and AD9631ARZ-REEL7 (18321 Pcs) offer significantly higher inventory availability.

Q: Is AD8015ARZ-REEL7 a suitable substitute for OPA656U?

A: No. AD8015ARZ-REEL7 is a transimpedance amplifier with differential output, fundamentally different from OPA656U voltage feedback topology. Although both use 8-SOIC package and share 240 MHz gain bandwidth product specification, transimpedance amplifiers are designed for photodiode and current-input applications, not voltage feedback signal conditioning. Circuit topology incompatibility precludes direct substitution.

Q: Are all substitute parts ROHS3 Compliant and REACH Unaffected?

A: Yes. All listed substitute parts (OPA656UB/2K5, OPA656UB, AD8015ARZ-REEL7, AD8047ARZ, AD8047ARZ-REEL7, AD8048ARZ, AD8048ARZ-REEL7, AD9631ARZ, AD9631ARZ-REEL, AD9631ARZ-REEL7) are ROHS3 Compliant and REACH Unaffected, maintaining regulatory compliance equivalence with OPA656U.

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