OPA657UBG4 Equivalent & Substitute Parts

Part Overview

The OPA657UBG4 is a voltage feedback amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute components for ongoing design support and procurement continuity. The OPA657UBG4 delivers high-speed amplification with a 1.6 GHz gain bandwidth product and 700 V/µs slew rate, suitable for applications requiring wideband signal conditioning and high-frequency amplification.

Key Parameters

Parameter	Value	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
Voltage - Supply Span (Min)	8	V
Voltage - Supply Span (Max)	12	V
Operating Temperature	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	3 (168 Hours)	—

Substitute Part Grouping Explanation

Substitution of the OPA657UBG4 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: Voltage Feedback (required match)
Number of Circuits: 1 (required match)
Package / Case: 8-SOIC surface mount (required match)
Operating Temperature Range: -40°C to 85°C (required match)
Supply Voltage Range: Minimum 8 V to 12 V maximum (substitute must accommodate this range)

Secondary Compatibility Parameters:

Slew Rate: 700 V/µs or higher
Gain Bandwidth Product: 1.6 GHz or higher
-3dB Bandwidth: 350 MHz or higher
Input Bias Current: 1 pA or lower
Input Offset Voltage: 100 µV or lower
Supply Current: 14 mA or lower

Substitute parts are grouped into two categories based on electrical performance alignment:

Group 1 - Direct Functional Equivalents (Texas Instruments OPA657 Series): OPA657UB maintains identical electrical specifications to the OPA657UBG4, differing only in packaging format (Tube vs. unspecified). This part is active and directly interchangeable.

Group 2 - Performance-Enhanced Substitutes (Analog Devices AD804x/AD963x Series): AD8047ARZ, AD8047ARZ-REEL7, AD8048ARZ, AD8048ARZ-REEL7, AD9631ARZ, AD9631ARZ-REEL, AD9631ARZ-REEL7, AD9632ARZ, and AD9632ARZ-REEL7 exceed the OPA657UBG4 specifications in slew rate and/or bandwidth while maintaining compatible supply voltage ranges and package form factors. These parts are active and provide enhanced performance margins.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (GHz)	-3dB BW (MHz)	Input Bias (pA/µA)	Input Offset (µV/mV)	Supply Current (mA)	Supply Min (V)	Supply Max (V)	Package	MSL
OPA657UBG4	Texas Instruments	Obsolete	700	1.6	350	1 pA	100 µV	14	8	12	8-SOIC	3
OPA657UB	Texas Instruments	Active	700	1.6	350	1 pA	100 µV	14	8	12	8-SOIC	3
AD8047ARZ	Analog Devices	Active	750	—	250	1 µA	1 mV	5.8	6	12	8-SOIC	1
AD8047ARZ-REEL7	Analog Devices	Active	750	—	250	1 µA	1 mV	5.8	6	12	8-SOIC	1
AD8048ARZ	Analog Devices	Active	1000	—	260	1 µA	1 mV	5.9	6	12	8-SOIC	1
AD8048ARZ-REEL7	Analog Devices	Active	1000	—	260	1 µA	1 mV	5.9	6	12	8-SOIC	1
AD9631ARZ	Analog Devices	Active	1300	—	320	2 µA	3 mV	17	6	12	8-SOIC	1
AD9631ARZ-REEL	Analog Devices	Active	1300	—	320	2 µA	3 mV	17	6	12	8-SOIC	1
AD9631ARZ-REEL7	Analog Devices	Active	1300	—	320	2 µA	3 mV	17	6	12	8-SOIC	1
AD9632ARZ	Analog Devices	Active	1500	—	250	2 µA	2 mV	16	6	12	8-SOIC	1
AD9632ARZ-REEL7	Analog Devices	Active	1500	—	250	2 µA	2 mV	16	6	12	8-SOIC	1

Engineering Selection Recommendations

Primary Recommendation: OPA657UB

The OPA657UB is the direct active equivalent of the OPA657UBG4. It maintains identical electrical specifications across all measured parameters and is manufactured by the same supplier (Texas Instruments). The part is currently in active production status with 1,308 units in stock. Both parts are ROHS3 compliant and carry identical REACH and ECCN classifications. The OPA657UB differs only in packaging format (Tube), making it the optimal choice for direct replacement in existing designs without circuit modification.

Secondary Recommendations: Analog Devices AD804x and AD963x Series

When enhanced performance is acceptable or beneficial, the Analog Devices substitutes provide measurable improvements:

AD8048ARZ / AD8048ARZ-REEL7: Highest slew rate (1000 V/µs) with lowest supply current (5.9 mA). Suitable for applications requiring maximum transient response speed with reduced power consumption. MSL rating of 1 provides superior moisture resistance compared to the OPA657UBG4.
AD9632ARZ / AD9632ARZ-REEL7: Highest slew rate (1500 V/µs) with moderate supply current (16 mA). Optimal for high-speed signal processing applications where bandwidth and slew rate are critical performance drivers.
AD8047ARZ / AD8047ARZ-REEL7: Moderate slew rate (750 V/µs) with lowest supply current (5.8 mA). Suitable for power-constrained applications where the OPA657UBG4 specifications are not fully utilized.
AD9631ARZ / AD9631ARZ-REEL / AD9631ARZ-REEL7: Balanced performance (1300 V/µs slew rate, 320 MHz bandwidth) with higher supply current (17 mA). Appropriate for applications requiring enhanced bandwidth performance.

All Analog Devices substitutes operate within the OPA657UBG4 supply voltage range (6 V minimum to 12 V maximum) and maintain 8-SOIC package compatibility. All are ROHS3 compliant with MSL rating of 1 (unlimited moisture exposure).

Frequently Asked Questions (FAQ)

Q: Can OPA657UB directly replace OPA657UBG4 without circuit modification?

A: Yes. The OPA657UB is electrically identical to the OPA657UBG4 across all specified parameters: slew rate, gain bandwidth product, input bias current, input offset voltage, supply current, and operating temperature range. The only difference is packaging format (Tube vs. unspecified). No circuit redesign is required.

Q: What is the primary difference between OPA657UB and the Analog Devices substitutes?

A: The OPA657UB maintains exact electrical parity with the obsolete OPA657UBG4. Analog Devices parts (AD8047, AD8048, AD9631, AD9632 series) exceed the OPA657UBG4 specifications in slew rate and/or bandwidth performance. Selection depends on whether the application requires exact specification matching or can benefit from enhanced performance margins.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts listed use the 8-SOIC (0.154", 3.90mm Width) surface mount package, which is mechanically and electrically compatible with the OPA657UBG4 footprint. No PCB redesign is necessary for package compatibility.

Q: What does MSL rating mean, and why do the Analog Devices parts have MSL 1 instead of MSL 3?

A: MSL (Moisture Sensitivity Level) indicates the maximum time a component can be exposed to moisture before soldering. MSL 3 (OPA657UBG4) allows 168 hours of exposure. MSL 1 (Analog Devices parts) allows unlimited exposure. Lower MSL ratings provide superior moisture resistance and reduce risk of component degradation during storage and handling. This is an advantage for the Analog Devices substitutes.

Q: Can I use AD8047ARZ in a design that requires 1.6 GHz gain bandwidth product?

A: No. The AD8047ARZ does not specify a gain bandwidth product parameter in the provided data. The OPA657UB is the only substitute that maintains the 1.6 GHz GBW specification. If gain bandwidth product is a critical design requirement, use OPA657UB.

Q: What is the difference between AD8048ARZ and AD8048ARZ-REEL7?

A: Both parts are electrically identical. The difference is packaging format: AD8048ARZ is supplied in Tube packaging, while AD8048ARZ-REEL7 is supplied in Cut Tape (CT) & Digi-Reel® format. Selection depends on procurement and assembly requirements. AD8048ARZ-REEL7 has higher inventory availability (15,400 units vs. 4,632 units).

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and carry identical REACH Unaffected status. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001.

Q: Which substitute offers the lowest power consumption?

A: AD8047ARZ and AD8047ARZ-REEL7 offer the lowest supply current at 5.8 mA, compared to 14 mA for the OPA657UBG4. This represents a 59% reduction in supply current, making these parts suitable for battery-powered or power-constrained applications.

Q: Can I use multiple substitute parts interchangeably in the same design?

A: No. While all substitutes are mechanically compatible, they have different electrical specifications. Substituting one part for another mid-production or mid-design cycle requires circuit validation. Use a single substitute part number throughout a design unless circuit analysis confirms compatibility of the different electrical parameters.

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