INA105BM Equivalent & Substitute Parts

Part Overview

The INA105BM is a differential amplifier integrated circuit manufactured by Texas Instruments, housed in a TO-99-8 metal can package for through-hole mounting. This device functions as a precision differential amplifier with a single circuit configuration, designed for analog signal conditioning and measurement applications requiring low input offset voltage and stable gain characteristics.

The INA105BM is classified as Last Time Buy, indicating that Texas Instruments has discontinued this product line. Finding functionally equivalent substitute parts is necessary for ongoing production, maintenance, and new design implementations where through-hole or surface-mount alternatives are acceptable.

Substiute Parts

INA105BM

Texas InstrumentsIn Stock: 66002INA105BM Datasheet

Current PartRFQ

INA105KU/2K5

Texas InstrumentsIn Stock: 2803INA105KU/2K5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the INA105BM is determined by electrical and functional equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Amplifier Type: Differential (single circuit)
• Slew Rate: 3 V/µs
• -3dB Bandwidth: 1 MHz
• Voltage - Input Offset: 50 µV
• Current - Supply: 1.5 mA
• Current - Output / Channel: 20 mA
• Voltage - Supply Span: 10 V to 36 V
• Operating Temperature Range: -40°C to 85°C

Functional Equivalence Criteria:

• Base Product Number: INA105 (same functional family)
• Regulatory Compliance: ROHS3 Compliant, REACH Unaffected

Substitute parts must maintain identical electrical performance specifications and regulatory compliance status. Package and mounting type may differ based on application requirements and PCB design constraints. The INA105KU/2K5 meets all electrical equivalence criteria while offering an alternative surface-mount package configuration.

Parameter Comparison

Engineering Selection Recommendations

For Through-Hole Applications: The INA105BM remains the appropriate selection when through-hole mounting is required by PCB design specifications or assembly processes. However, given Last Time Buy status, inventory depletion is expected. Current stock of 65,980 pieces provides limited long-term availability.

For New Designs and Surface-Mount Applications: The INA105KU/2K5 is the recommended substitute for new product development and redesigns. This part maintains complete electrical equivalence across all specified parameters while offering surface-mount technology advantages. Active product status ensures ongoing availability and supply chain stability. Current inventory of 2,700 pieces supports immediate procurement.

Regulatory and Compliance Considerations: Both parts maintain identical ROHS3 compliance and REACH unaffected status, ensuring regulatory equivalence for applications subject to environmental and hazardous substance restrictions.

Packaging Transition: Selection between INA105BM and INA105KU/2K5 is determined solely by mounting technology requirements. PCB layout, assembly equipment, and design constraints dictate the appropriate package choice. No electrical performance difference exists between these alternatives.

Frequently Asked Questions (FAQ)

Q: Can INA105KU/2K5 directly replace INA105BM in existing through-hole designs?

A: No. The INA105KU/2K5 uses 8-SOIC surface-mount packaging, while INA105BM uses TO-99-8 through-hole packaging. Direct PCB substitution is not possible without redesign. However, the electrical performance is identical, making the INA105KU/2K5 suitable for redesigned boards using surface-mount assembly.

Q: What is the significance of Last Time Buy status for INA105BM?

A: Last Time Buy indicates Texas Instruments has discontinued this product. Existing inventory will be depleted, and future availability cannot be guaranteed. For applications requiring through-hole mounting, alternative through-hole differential amplifiers from the INA105 family should be evaluated. For new designs, surface-mount alternatives such as INA105KU/2K5 are recommended.

Q: Are the electrical specifications identical between INA105BM and INA105KU/2K5?

A: Yes. Both parts share identical specifications for slew rate (3 V/µs), bandwidth (1 MHz), input offset voltage (50 µV), supply current (1.5 mA), output current (20 mA), supply voltage range (10 V to 36 V), and operating temperature range (-40°C to 85°C). The only differences are packaging and mounting technology.

Q: What does the MSL rating on INA105KU/2K5 indicate?

A: The Moisture Sensitivity Level (MSL) of 3 (168 Hours) applies only to the surface-mount INA105KU/2K5. This specifies moisture handling requirements during storage and assembly. The through-hole INA105BM carries MSL Not Applicable. Proper moisture control procedures must be followed for the INA105KU/2K5 per IPC standards.

Q: Can both parts be used interchangeably in the same circuit design?

A: Electrically, yes. Functionally, both parts deliver identical performance. However, physical substitution requires PCB redesign due to different package types. Circuit-level performance remains unchanged when proper PCB layout is implemented for the selected package.

Q: What is the difference between Cut Tape (CT) and Digi-Reel packaging for INA105KU/2K5?

A: Cut Tape and Digi-Reel are packaging and delivery formats for surface-mount components. Both contain identical INA105KU/2K5 parts. Cut Tape is suitable for smaller quantities and manual assembly, while Digi-Reel is optimized for automated pick-and-place equipment and higher-volume production.