OPA2604APG4 Equivalent & Substitute Parts

Part Overview

The OPA2604APG4 is a general-purpose operational amplifier manufactured by Texas Instruments, featuring two differential output circuits in an 8-PDIP through-hole package. This device is classified as obsolete, indicating discontinued production and limited availability for new designs. The part operates across a wide supply voltage range of 9V to 48V with a slew rate of 25V/µs and gain bandwidth product of 20 MHz, making it suitable for analog signal processing applications requiring differential outputs.

Due to its obsolete status, identifying functionally equivalent substitute components is essential for design continuity, system maintenance, and procurement planning. Substitute parts must maintain compatibility with existing through-hole PCB layouts or accommodate surface-mount alternatives where design modifications are feasible.

Substiute Parts

OPA2604APG4

Texas InstrumentsIn Stock: 1000OPA2604APG4 Datasheet

Current PartRFQ

OPA2156IDR

Texas InstrumentsIn Stock: 4390OPA2156IDR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA2604APG4 is determined by the following critical parameters:

Functional Equivalence Criteria:

• Dual-channel operational amplifier architecture (2 circuits minimum)
• Supply voltage compatibility within the operating range
• Slew rate and gain bandwidth product sufficient for signal processing applications
• Input bias current and input offset voltage specifications suitable for the intended circuit topology
• Output current capability meeting or exceeding application requirements

Package and Mounting Considerations:

• Through-hole 8-DIP packaging is the primary form factor for direct PCB replacement
• Surface-mount alternatives (8-SOIC) require PCB redesign but offer improved performance characteristics and active product status

Compliance and Availability:

• RoHS3 compliance required for regulatory adherence
• Active product status preferred to ensure long-term availability and supply chain stability
• MSL rating appropriate for storage and handling conditions

The OPA2156IDR qualifies as a manufacturer-recommended substitute based on dual-channel architecture, dual-supply operation, and Texas Instruments lineage, though it introduces package and performance trade-offs requiring engineering evaluation.

Parameter Comparison

Engineering Selection Recommendations

OPA2604APG4 (Original Part): The OPA2604APG4 remains the specified component for existing designs with through-hole PCB layouts and established performance validation. Its obsolete status necessitates inventory planning and long-term supply chain assessment. RoHS3 compliance and MSL Level 1 rating support standard manufacturing and storage protocols.

OPA2156IDR (Substitute Part): The OPA2156IDR is the manufacturer-recommended substitute, offering active product status and enhanced performance specifications. This CMOS amplifier provides superior slew rate (40V/µs vs. 25V/µs), improved input offset voltage (25µV vs. 1mV), and higher output current capability (100mA vs. 35mA per channel). Extended operating temperature range (-40°C to 125°C) accommodates broader environmental conditions.

Critical Substitution Constraints:

1. Package Incompatibility: The OPA2156IDR uses 8-SOIC surface-mount packaging, requiring PCB redesign and assembly process modification. Direct socket replacement is not possible without adapter solutions.

2. Supply Voltage Range: The OPA2156IDR maximum supply voltage is 36V, compared to 48V for the OPA2604APG4. Applications requiring supply voltages above 36V cannot use this substitute without circuit redesign.

3. Output Type Difference: The OPA2604APG4 features differential outputs, while the OPA2156IDR provides rail-to-rail output. Circuit topology compatibility must be verified.

4. Compliance Status: Both parts maintain RoHS3 compliance and EAR99 ECCN classification, supporting regulatory requirements without modification.

Selection Logic:

• For through-hole PCB designs with supply voltages ≤36V and rail-to-rail output compatibility: OPA2156IDR substitution is feasible with PCB redesign.
• For through-hole designs requiring >36V supply or differential output preservation: alternative through-hole dual-channel amplifiers must be evaluated outside the provided substitute list.
• For new designs: OPA2156IDR active status and enhanced performance specifications support long-term product lifecycle planning.

Frequently Asked Questions (FAQ)

Q: Can the OPA2156IDR replace the OPA2604APG4 without PCB modification?

A: No. The OPA2156IDR uses 8-SOIC surface-mount packaging (0.154" width) versus the OPA2604APG4's 8-DIP through-hole package (0.300" width). Direct socket replacement is not possible. PCB redesign and reflow soldering assembly are required.

Q: What is the maximum supply voltage for each part?

A: The OPA2604APG4 operates at supply voltages up to 48V. The OPA2156IDR maximum supply voltage is 36V. Applications requiring supply voltages between 36V and 48V cannot use the OPA2156IDR without circuit redesign.

Q: How do the output types differ between these parts?

A: The OPA2604APG4 provides differential outputs. The OPA2156IDR provides rail-to-rail outputs. Circuit topology and signal conditioning requirements must be evaluated to determine compatibility.

Q: Is the OPA2156IDR suitable for low-temperature applications?

A: Yes. The OPA2156IDR operating temperature range is -40°C to 125°C, compared to -25°C to 85°C for the OPA2604APG4. The OPA2156IDR supports extended low-temperature operation.

Q: What are the input bias current differences?

A: The OPA2604APG4 has an input bias current of 100pA. The OPA2156IDR has an input bias current of 5pA. The OPA2156IDR provides significantly lower input bias current, reducing errors in high-impedance signal conditioning circuits.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the OPA2604APG4 and OPA2156IDR are RoHS3 compliant and REACH unaffected, supporting regulatory requirements for electronic component procurement.

Q: What is the moisture sensitivity level (MSL) for each part?

A: The OPA2604APG4 has MSL Level 1 (unlimited shelf life). The OPA2156IDR has MSL Level 2 (1-year shelf life). The OPA2156IDR requires more stringent storage and handling protocols to maintain component reliability.

Q: Why is the OPA2604APG4 classified as obsolete?

A: Obsolete status indicates Texas Instruments has discontinued production. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. Active substitute parts ensure design continuity and supply chain stability.

Q: Can the OPA2156IDR be used in high-speed applications?

A: The OPA2156IDR provides improved slew rate (40V/µs vs. 25V/µs) and higher gain bandwidth product (25MHz vs. 20MHz), supporting faster signal processing compared to the OPA2604APG4. Application-specific performance validation is required.

Q: What is the output current capability difference?

A: The OPA2604APG4 provides 35mA per channel output current. The OPA2156IDR provides 100mA per channel output current. The OPA2156IDR supports higher load current applications without additional output buffering.