OPA445BM Equivalent & Substitute Parts

Part Overview

The OPA445BM is a general-purpose operational amplifier manufactured by Texas Instruments, housed in a TO-99-8 metal can package for through-hole mounting. This device is classified as a Last Time Buy product, indicating that it is no longer in active production. The OPA445BM remains suitable for legacy system maintenance, repair, and low-volume applications where the through-hole TO-99-8 package is required. Identifying equivalent substitute parts is necessary to ensure continued availability for production support and to provide design flexibility for new implementations using the same electrical specifications.

Substiute Parts

OPA445BM

Texas InstrumentsIn Stock: 1450OPA445BM Datasheet

Current PartRFQ

OPA445AU/2K5

Texas InstrumentsIn Stock: 1675OPA445AU/2K5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA445BM is determined by electrical parameter equivalence across the following critical specifications:

• Amplifier Type: General Purpose (single circuit)
• Slew Rate: 15 V/µs
• Gain Bandwidth Product: 2 MHz
• Input Bias Current: 10 pA
• Supply Voltage Range: 20 V to 90 V
• Operating Temperature Range: -25°C to 85°C
• Output Current Capability: 15 mA per channel
• RoHS Compliance: ROHS3 Compliant

The OPA445AU/2K5 shares the same base product number (OPA445) and maintains electrical equivalence across all critical parameters. The primary distinction between these parts is the package type: the OPA445BM uses a through-hole TO-99-8 metal can, while the OPA445AU/2K5 uses a surface-mount 8-SOIC package. Both devices are manufactured by Texas Instruments and comply with ROHS3 and REACH requirements.

Parameter Comparison

Engineering Selection Recommendations

For Through-Hole Applications: The OPA445BM remains the appropriate choice when PCB design requires through-hole mounting and TO-99-8 metal can packaging. Current inventory of 1356 pieces supports ongoing production and repair operations.

For Surface-Mount Applications: The OPA445AU/2K5 is the direct electrical equivalent when surface-mount technology is required. This part is in Active product status with 1654 pieces in inventory, providing superior long-term availability compared to the Last Time Buy OPA445BM. The OPA445AU/2K5 maintains all critical electrical parameters and compliance certifications.

Compliance Considerations: Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.

Voltage Offset Specification: The OPA445AU/2K5 specifies a maximum input offset voltage of 1.5 mV compared to 1.0 mV for the OPA445BM. This 0.5 mV difference remains within typical application tolerances for general-purpose amplifier circuits and does not restrict substitution for standard signal conditioning applications.

Frequently Asked Questions (FAQ)

Q: Can the OPA445AU/2K5 replace the OPA445BM in existing designs?

A: Electrical substitution is valid when the application permits surface-mount package conversion. The OPA445AU/2K5 maintains identical electrical specifications across slew rate, gain bandwidth product, supply voltage range, and output current capability. PCB layout and assembly process changes are required to accommodate the 8-SOIC package format.

Q: What is the primary difference between these two parts?

A: The OPA445BM uses through-hole TO-99-8 metal can packaging for traditional PCB assembly, while the OPA445AU/2K5 uses surface-mount 8-SOIC packaging for automated assembly. All electrical performance parameters are equivalent.

Q: Why is the OPA445BM classified as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. Existing inventory remains available, but no future manufacturing is planned. The OPA445AU/2K5 in Active status provides a path for continued product support.

Q: Are there any performance differences in the input offset voltage specification?

A: The OPA445BM specifies 1.0 mV maximum input offset voltage, while the OPA445AU/2K5 specifies 1.5 mV. This 0.5 mV difference is typical between manufacturing process variations and does not affect functionality in general-purpose amplifier applications. Applications requiring tighter offset voltage control should evaluate this specification against circuit requirements.

Q: What are the compliance and regulatory considerations?

A: Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations for electronic components. No additional compliance documentation is required for substitution.

Q: Can the OPA445BM be used in new designs?

A: While the OPA445BM remains available in current inventory, new designs should specify the OPA445AU/2K5 due to its Active product status and superior long-term availability. The OPA445BM is appropriate for legacy system support and repair applications only.