OPA657UG4 Equivalent & Substitute Parts

Part Overview

The OPA657UG4 is a voltage feedback amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, with 909 units currently in stock. The OPA657UG4 delivers a gain bandwidth product of 1.6 GHz with a slew rate of 700V/µs, making it suitable for high-speed signal conditioning applications. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity and long-term component availability.

Key Parameters

Parameter	OPA657UG4 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	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	—
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	3 (168 Hours)	—

Substitute Part Grouping Explanation

Substitution of the OPA657UG4 is determined by the following critical parameters:

Mechanical Compatibility: All substitute parts must use the 8-SOIC surface mount package with 0.154" (3.90mm) width to ensure PCB footprint compatibility.

Electrical Performance Envelope: Substitute parts must operate within the supply voltage range of 8V to 12V minimum and maximum. The slew rate, gain bandwidth product, and -3dB bandwidth define the frequency response characteristics. Input bias current and input offset voltage determine signal fidelity in precision applications.

Thermal and Environmental Compliance: All substitutes must support the operating temperature range of -40°C to 85°C and maintain ROHS3 compliance for regulatory adherence.

Functional Classification: All substitutes are voltage feedback amplifiers with a single circuit configuration, ensuring functional equivalence in circuit topology.

The substitute parts are grouped into two categories:

Direct Equivalents (Texas Instruments OPA657 Series): OPA657U and OPA657UB maintain identical package, supply voltage range, and operating temperature specifications. These parts differ in input bias current and input offset voltage specifications, with OPA657UB offering tighter tolerances (1 pA input bias current, 100 µV input offset voltage versus 2 pA and 250 µV respectively).

Cross-Manufacturer Alternatives (Analog Devices): AD8047ARZ, AD8047ARZ-REEL7, AD8048ARZ, AD8048ARZ-REEL7, AD9631ARZ, AD9631ARZ-REEL, AD9631ARZ-REEL7, and AD9632ARZ provide functional substitution with variations in slew rate, bandwidth, and supply voltage specifications. These parts operate across a wider supply voltage range (6V to 12V) and feature different performance characteristics suited to specific application requirements.

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	GBW (GHz)	-3dB BW (MHz)	Input Bias (pA/µA)	Input Offset (µV/mV)	Supply Current (mA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Package	Status
OPA657UG4	Texas Instruments	700	1.6	350	2 pA	250 µV	14	70	8	12	8-SOIC	Obsolete
OPA657U	Texas Instruments	700	1.6	350	2 pA	250 µV	14	70	8	12	8-SOIC	Active
OPA657UB	Texas Instruments	700	1.6	350	1 pA	100 µV	14	70	8	12	8-SOIC	Active
AD8047ARZ	Analog Devices Inc.	750	—	250	1 µA	1 mV	5.8	50	6	12	8-SOIC	Active
AD8047ARZ-REEL7	Analog Devices Inc.	750	—	250	1 µA	1 mV	5.8	50	6	12	8-SOIC	Active
AD8048ARZ	Analog Devices Inc.	1000	—	260	1 µA	1 mV	5.9	50	6	12	8-SOIC	Active
AD8048ARZ-REEL7	Analog Devices Inc.	1000	—	260	1 µA	1 mV	5.9	50	6	12	8-SOIC	Active
AD9631ARZ	Analog Devices Inc.	1300	—	320	2 µA	3 mV	17	70	6	12	8-SOIC	Active
AD9631ARZ-REEL	Analog Devices Inc.	1300	—	320	2 µA	3 mV	17	70	6	12	8-SOIC	Active
AD9631ARZ-REEL7	Analog Devices Inc.	1300	—	320	2 µA	3 mV	17	70	6	12	8-SOIC	Active
AD9632ARZ	Analog Devices Inc.	1500	—	250	2 µA	2 mV	16	70	6	12	8-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: OPA657U is the direct functional equivalent to OPA657UG4. Both parts are manufactured by Texas Instruments, share identical electrical specifications, and are housed in the same 8-SOIC package. OPA657U is currently in active production status with 1301 units in stock, ensuring long-term availability. This part is suitable for direct replacement in existing designs without circuit modification.

Enhanced Performance Alternative: OPA657UB offers improved input specifications with reduced input bias current (1 pA versus 2 pA) and lower input offset voltage (100 µV versus 250 µV). This part maintains all other electrical and mechanical parameters identical to OPA657UG4 and is recommended for applications requiring tighter input precision. OPA657UB is active production status with 1308 units in stock.

Cross-Manufacturer Substitutes: Analog Devices parts provide functional alternatives with trade-offs in performance characteristics:

AD8048ARZ and AD8048ARZ-REEL7 offer increased slew rate (1000V/µs versus 700V/µs) and comparable -3dB bandwidth (260 MHz versus 350 MHz). These parts operate across a wider supply voltage range (6V to 12V) and feature lower supply current (5.9 mA versus 14 mA). Suitable for applications where lower power consumption is prioritized.

AD9631ARZ, AD9631ARZ-REEL, and AD9631ARZ-REEL7 deliver the highest slew rate (1300V/µs) and -3dB bandwidth (320 MHz) among substitutes. These parts maintain 70 mA output current matching the original specification. Recommended for high-speed signal processing applications. Available in multiple packaging formats (Tube, Tape & Reel, Cut Tape & Digi-Reel).

AD9632ARZ provides the highest slew rate (1500V/µs) with -3dB bandwidth of 250 MHz. This part is suitable for applications requiring maximum slew rate performance within the 8-SOIC package constraint.

All substitute parts maintain ROHS3 compliance and operate across the -40°C to 85°C temperature range, ensuring regulatory and thermal compatibility.

Frequently Asked Questions (FAQ)

Q: Can OPA657U directly replace OPA657UG4 without circuit modification?

A: Yes. OPA657U is electrically and mechanically identical to OPA657UG4. Both parts share the same slew rate (700V/µs), gain bandwidth product (1.6 GHz), -3dB bandwidth (350 MHz), supply voltage range (8V to 12V), and 8-SOIC package. OPA657U is in active production, making it the recommended direct replacement.

Q: What is the difference between OPA657U and OPA657UB?

A: OPA657UB features tighter input specifications: input bias current of 1 pA (versus 2 pA) and input offset voltage of 100 µV (versus 250 µV). All other parameters remain identical. OPA657UB is recommended for precision signal conditioning applications where lower input offset and bias current are required.

Q: Can Analog Devices parts substitute for the OPA657UG4?

A: Analog Devices parts provide functional substitution with performance variations. All Analog Devices alternatives maintain the 8-SOIC package and -40°C to 85°C operating temperature range. However, they differ in slew rate, bandwidth, supply current, and supply voltage range. Selection depends on specific application requirements. Circuits designed for the OPA657UG4 may require optimization for Analog Devices alternatives.

Q: What is the difference between AD8047ARZ and AD8048ARZ?

A: AD8048ARZ offers higher slew rate (1000V/µs versus 750V/µs) and slightly higher -3dB bandwidth (260 MHz versus 250 MHz). Both parts share identical supply voltage range (6V to 12V), input bias current (1 µA), and input offset voltage (1 mV). AD8048ARZ is recommended for applications requiring maximum slew rate within the Analog Devices portfolio.

Q: What packaging options are available for Analog Devices substitutes?

A: Analog Devices substitutes are available in multiple packaging formats: Tube (standard), Tape & Reel (TR), and Cut Tape & Digi-Reel (CT). Part numbers ending in "-REEL" or "-REEL7" indicate alternative packaging. All packaging options use the same 8-SOIC component footprint and are electrically identical.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed—OPA657U, OPA657UB, and all Analog Devices alternatives—are ROHS3 compliant. This ensures regulatory compliance for applications subject to RoHS directives.

Q: What is the moisture sensitivity level (MSL) difference between parts?

A: OPA657UG4, OPA657U, and OPA657UB have MSL 3 (168 hours). Analog Devices parts have MSL 1 (Unlimited), indicating superior moisture resistance and longer shelf life without desiccant storage requirements.

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 OPA657UG4. AD8048ARZ and AD8048ARZ-REEL7 consume 5.9 mA. These parts are recommended for battery-powered or power-constrained applications.

Q: Can I use AD9631ARZ-REEL7 in place of OPA657UG4?

A: AD9631ARZ-REEL7 provides functional substitution with enhanced performance: higher slew rate (1300V/µs versus 700V/µs) and higher -3dB bandwidth (320 MHz versus 350 MHz). The part maintains 70 mA output current and operates across 6V to 12V supply range. Circuit optimization may be required due to performance differences. The "-REEL7" designation indicates Cut Tape & Digi-Reel packaging; electrical specifications are identical to AD9631ARZ and AD9631ARZ-REEL.

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