OPA2604AU Equivalent & Substitute Parts

Part Overview

The OPA2604AU is a general purpose operational amplifier manufactured by Texas Instruments, featuring two independent circuits in an 8-SOIC surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement. The OPA2604AU is designed for differential output applications with a slew rate of 25V/µs and gain bandwidth product of 20 MHz, suitable for general purpose amplification circuits requiring moderate to high-speed performance.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPA2604AU
Manufacturer	Texas Instruments
Category	Linear, Amplifiers
Amplifier Type	General Purpose
Number of Circuits	2
Output Type	Differential
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Slew Rate	25V/µs
Gain Bandwidth Product	20 MHz
Current - Input Bias	100 pA
Voltage - Input Offset	1 mV
Current - Supply	10.5mA (x2 Channels)
Current - Output / Channel	35 mA
Voltage - Supply Span (Min)	9 V
Voltage - Supply Span (Max)	48 V
Operating Temperature	-25°C ~ 85°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the OPA2604AU is determined by the following critical parameters: package compatibility (8-SOIC form factor), number of circuits (2 independent amplifiers), surface mount mounting type, and electrical performance envelope defined by supply voltage range, slew rate, gain bandwidth product, and input/output current specifications.

The substitute parts are grouped into two functional categories:

Category 1: Audio Amplifiers (LM833DR2G, LM833DT, NCV833DR2G) These parts share the 8-SOIC package and dual-circuit configuration. They operate within compatible supply voltage ranges (10V–36V minimum to maximum) and provide adequate output current (29–37 mA per channel). The slew rate of 7V/µs and gain bandwidth product of 15 MHz are lower than the OPA2604AU, making these suitable for audio and lower-speed general purpose applications where the OPA2604AU's performance margin is not required.

Category 2: General Purpose and J-FET Amplifiers (TSH22IDT, TL072CDT) TSH22IDT is a general purpose amplifier with superior gain bandwidth product (25 MHz) and slew rate (15V/µs), operating across an extended temperature range (-40°C to 125°C) with lower supply voltage minimum (3V). TL072CDT is a J-FET input amplifier with automotive qualification (AEC-Q100) and extremely low input bias current (20 pA), suitable for precision applications requiring minimal input current.

All substitute parts maintain the 8-SOIC package footprint, dual-circuit configuration, and ROHS3 compliance required for direct substitution consideration.

Parameter Comparison

Parameter	OPA2604AU	LM833DR2G	LM833DT	NCV833DR2G	TSH22IDT	TL072CDT
Manufacturer	Texas Instruments	onsemi	STMicroelectronics	onsemi	STMicroelectronics	STMicroelectronics
Amplifier Type	General Purpose	Audio	Audio	Audio	General Purpose	J-FET
Number of Circuits	2	2	2	2	2	2
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Slew Rate	25V/µs	7V/µs	7V/µs	7V/µs	15V/µs	16V/µs
Gain Bandwidth Product	20 MHz	15 MHz	15 MHz	15 MHz	25 MHz	4 MHz
Current - Input Bias	100 pA	300 nA	300 nA	300 nA	100 nA	20 pA
Voltage - Input Offset	1 mV	300 µV	300 µV	300 µV	2.5 mV	3 mV
Current - Supply	10.5mA	4mA	4mA	4mA	2.15mA	1.4mA
Current - Output / Channel	35 mA	29 mA	37 mA	Not Specified	37 mA	40 mA
Voltage - Supply Span (Min)	9 V	10 V	5 V	10 V	3 V	6 V
Voltage - Supply Span (Max)	48 V	36 V	30 V	36 V	30 V	36 V
Operating Temperature	-25°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 125°C	0°C ~ 70°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Audio and Lower-Speed Applications: LM833DR2G, LM833DT, and NCV833DR2G are active production alternatives suitable for audio amplification and general purpose circuits where the OPA2604AU's higher slew rate and bandwidth are not required. All three maintain ROHS3 compliance and offer improved moisture sensitivity ratings (MSL 1 vs. MSL 3). LM833DT provides the widest operating temperature range (-40°C to 105°C) and lowest minimum supply voltage (5V), making it suitable for extended temperature applications. LM833DR2G and NCV833DR2G are functionally equivalent with supply ranges of 10V–36V.

For High-Speed General Purpose Applications: TSH22IDT offers superior gain bandwidth product (25 MHz) and slew rate (15V/µs) comparable to the OPA2604AU, with extended operating temperature range (-40°C to 125°C) and lower minimum supply voltage (3V). This part is recommended for applications requiring the OPA2604AU's performance characteristics with active production status and improved thermal range.

For Precision and Automotive Applications: TL072CDT is an automotive-qualified J-FET input amplifier (AEC-Q100) with extremely low input bias current (20 pA), suitable for precision instrumentation and automotive circuits. The J-FET input topology provides superior input impedance characteristics. Operating temperature range is limited to 0°C–70°C, and maximum supply voltage is 36V, requiring verification against application requirements.

Supply Voltage Compatibility: The OPA2604AU operates from 9V to 48V. Substitutes operate within narrower ranges: LM833 variants (10V–36V), TSH22IDT (3V–30V), and TL072CDT (6V–36V). Applications requiring supply voltages above 36V cannot use any listed substitutes. Applications requiring supply voltages below 9V are compatible only with TSH22IDT (minimum 3V).

Frequently Asked Questions (FAQ)

Q: Can LM833DR2G directly replace OPA2604AU in all applications? A: LM833DR2G shares the 8-SOIC package and dual-circuit configuration, enabling direct footprint compatibility. However, electrical performance differs: slew rate is 7V/µs versus 25V/µs, and gain bandwidth product is 15 MHz versus 20 MHz. Substitution is valid for audio and lower-speed applications where these performance margins are not required. Supply voltage range is 10V–36V versus 9V–48V for the OPA2604AU, requiring verification for applications using supply voltages below 10V or above 36V.

Q: What is the difference between LM833DR2G and LM833DT? A: Both are LM833 audio amplifiers with identical electrical specifications (7V/µs slew rate, 15 MHz bandwidth, 4mA supply current). Primary differences are: manufacturer (onsemi versus STMicroelectronics), packaging format (Tape & Reel versus Cut Tape & Digi-Reel), operating temperature range (LM833DT extends to 105°C versus 85°C), and minimum supply voltage (LM833DT operates from 5V versus 10V). LM833DT is preferred for extended temperature applications and lower supply voltage requirements.

Q: Why is TSH22IDT recommended over audio amplifiers for high-speed applications? A: TSH22IDT is classified as a general purpose amplifier with gain bandwidth product of 25 MHz and slew rate of 15V/µs, exceeding the audio amplifier specifications (15 MHz and 7V/µs respectively). These parameters approach the OPA2604AU performance envelope (20 MHz and 25V/µs). TSH22IDT is recommended when the OPA2604AU's higher-speed characteristics are required and active production status is necessary.

Q: Is TL072CDT suitable for all OPA2604AU applications? A: TL072CDT is a J-FET input amplifier with automotive qualification (AEC-Q100) and extremely low input bias current (20 pA). It shares the 8-SOIC package and dual-circuit configuration. However, operating temperature range is limited to 0°C–70°C (versus -25°C–85°C for OPA2604AU), and gain bandwidth product is only 4 MHz. TL072CDT is suitable for precision instrumentation and automotive applications where low input bias current is critical and lower bandwidth is acceptable.

Q: What packaging considerations apply to these substitutes? A: All substitute parts use the 8-SOIC (0.154", 3.90mm width) surface mount package, identical to the OPA2604AU. Footprint compatibility is direct. Moisture sensitivity levels differ: OPA2604AU is MSL 3 (168 hours), while all substitutes are MSL 1 (unlimited). This represents improved moisture tolerance for substitute parts, reducing handling and storage constraints.

Q: Are all substitute parts ROHS3 compliant? A: Yes, all listed substitute parts (LM833DR2G, LM833DT, NCV833DR2G, TSH22IDT, TL072CDT) are ROHS3 compliant, matching the OPA2604AU compliance status. All parts are also REACH unaffected and classified as EAR99 for export control purposes.

Q: Which substitute is recommended for applications requiring supply voltages above 36V? A: None of the listed substitute parts operate above 36V maximum supply voltage. The OPA2604AU's 48V maximum supply rating is unique among these alternatives. Applications requiring supply voltages between 36V and 48V cannot use any listed substitutes and require alternative component selection outside this substitute list.

Q: What is the significance of the OPA2604AU being obsolete? A: Obsolete status indicates the OPA2604AU is no longer manufactured by Texas Instruments. Existing inventory may be available through distributors, but long-term supply cannot be guaranteed. Active production substitutes (all listed alternatives) ensure ongoing availability for new designs and production continuity. Designs using the OPA2604AU should transition to active production alternatives for future manufacturing support.

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