OPA657U Equivalent & Substitute Parts

Part Overview

The OPA657U is a voltage feedback amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This single-circuit operational amplifier is classified as Active product status and is ROHS3 compliant. The OPA657U 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. Substitute parts are necessary when the OPA657U reaches end-of-life status, inventory constraints occur, or alternative performance characteristics better match specific application requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	OPA657U	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	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	3 (168 Hours)	—

Substitute Part Grouping Explanation

Substitution of the OPA657U is determined by electrical and mechanical compatibility across the following critical parameters:

Mechanical Compatibility Requirements:

Package type: 8-SOIC surface mount configuration with 0.154" (3.90mm) width
Mounting type: Surface mount
Pin count and footprint: 8-pin SOIC

Electrical Compatibility Requirements:

Amplifier type: Voltage feedback topology
Number of circuits: Single circuit per package
Operating temperature range: -40°C to 85°C minimum
Supply voltage span: Minimum 8 V to 12 V maximum (OPA657U specification)
Output current capability: Minimum 70 mA per channel

Compliance Requirements:

RoHS3 compliance
REACH unaffected status
ECCN: EAR99 classification

Substitute parts must satisfy all mechanical requirements and maintain electrical performance within the operating envelope. The following Analog Devices parts meet these criteria: AD8047ARZ, AD8047ARZ-REEL7, AD8048ARZ, AD9631ARZ, AD9631ARZ-REEL7, AD9632ARZ, and AD9632ARZ-REEL7.

Parameter Comparison

Parameter	OPA657U	AD8047ARZ	AD8047ARZ-REEL7	AD8048ARZ	AD9631ARZ	AD9631ARZ-REEL7	AD9632ARZ	AD9632ARZ-REEL7	Unit
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	—
Number of Circuits	1	1	1	1	1	1	1	1	—
Slew Rate	700	750	750	1000	1300	1300	1500	1500	V/µs
-3dB Bandwidth	350	250	250	260	320	320	250	250	MHz
Current - Input Bias	2	1	1	1	2	2	2	2	µA
Voltage - Input Offset	250	1	1	1	3	3	2	2	µV
Current - Supply	14	5.8	5.8	5.9	17	17	16	16	mA
Current - Output / Channel	70	50	50	50	70	70	70	70	mA
Voltage - Supply Span (Min)	8	6	6	6	6	6	6	6	V
Voltage - Supply Span (Max)	12	12	12	12	12	12	12	12	V
Operating Temperature	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	—
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
MSL	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—

Engineering Selection Recommendations

All substitute parts listed are Active product status devices manufactured by Analog Devices Inc. and are ROHS3 compliant with REACH unaffected status, matching the regulatory compliance profile of the OPA657U.

For applications requiring output current of 70 mA per channel: Select AD9631ARZ, AD9631ARZ-REEL7, AD9632ARZ, or AD9632ARZ-REEL7. These devices maintain the 70 mA output current specification of the OPA657U.

For applications with reduced output current requirements (50 mA per channel): AD8047ARZ, AD8047ARZ-REEL7, and AD8048ARZ are suitable alternatives with lower supply current consumption.

For packaging format selection: Tube packaging is available in AD8047ARZ, AD8048ARZ, AD9631ARZ, and AD9632ARZ. Cut Tape (CT) & Digi-Reel® packaging is available in AD8047ARZ-REEL7, AD9631ARZ-REEL7, and AD9632ARZ-REEL7.

For supply voltage compatibility: All substitute parts operate with a 6 V minimum supply voltage, providing broader supply range flexibility compared to the OPA657U 8 V minimum specification.

For moisture sensitivity: All substitute parts feature MSL 1 (Unlimited) rating, providing superior moisture tolerance compared to the OPA657U MSL 3 (168 Hours) specification.

Frequently Asked Questions (FAQ)

Q: Can AD8047ARZ be used as a direct replacement for OPA657U?

A: AD8047ARZ is mechanically compatible (8-SOIC package, surface mount) and electrically compatible (voltage feedback topology, single circuit, -40°C to 85°C operating range). However, the output current is 50 mA per channel versus 70 mA for the OPA657U. Selection depends on application output current requirements.

Q: What is the difference between AD9631ARZ and AD9631ARZ-REEL7?

A: Both parts are electrically identical with matching specifications. The difference is packaging format: AD9631ARZ is supplied in tube packaging, while AD9631ARZ-REEL7 is supplied in Cut Tape (CT) & Digi-Reel® format. Electrical performance and pin configuration are identical.

Q: Does the OPA657U have higher bandwidth than the substitute parts?

A: The OPA657U has a -3dB bandwidth of 350 MHz. Substitute parts range from 250 MHz (AD8047ARZ, AD8047ARZ-REEL7, AD9632ARZ, AD9632ARZ-REEL7) to 320 MHz (AD9631ARZ, AD9631ARZ-REEL7). Application requirements determine whether the OPA657U bandwidth is necessary or if substitute bandwidth is sufficient.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory compliance of the OPA657U.

Q: What is the minimum supply voltage for substitute parts?

A: All substitute parts operate with a 6 V minimum supply voltage, compared to the OPA657U 8 V minimum. This provides additional flexibility for lower-voltage applications.

Q: Which substitute part has the highest slew rate?

A: AD9632ARZ and AD9632ARZ-REEL7 have the highest slew rate at 1500 V/µs, compared to the OPA657U at 700 V/µs. Higher slew rate enables faster signal transitions in high-frequency applications.

Q: Can I use AD8048ARZ if my application requires 70 mA output current?

A: No. AD8048ARZ provides 50 mA output current per channel, which is insufficient for applications requiring 70 mA. Select AD9631ARZ, AD9631ARZ-REEL7, AD9632ARZ, or AD9632ARZ-REEL7 for 70 mA output current compatibility.

Q: What is the moisture sensitivity difference between OPA657U and substitute parts?

A: The OPA657U has MSL 3 (168 Hours) rating, requiring storage in controlled humidity conditions. All substitute parts have MSL 1 (Unlimited) rating, allowing indefinite storage without moisture control requirements.

Q: Are the pin configurations identical between OPA657U and all substitute parts?

A: All parts use 8-SOIC package configuration with identical pin count. Pin-to-pin compatibility is maintained across all listed substitutes.

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