OPA1644AIPWR Equivalent & Substitute Parts

Part Overview

The OPA1644AIPWR is a quad-channel audio amplifier integrated circuit manufactured by Texas Instruments in the SoundPlus™ series. This rail-to-rail operational amplifier is designed for audio signal processing applications requiring four independent amplification circuits in a compact 14-TSSOP surface mount package. The device is currently in active production status with 1920 units available in new original inventory. Substitute parts are identified when equivalent functional performance is required due to component availability, supply chain constraints, or design flexibility within specified electrical and mechanical parameters.

Substiute Parts

OPA1644AIPWR

Texas InstrumentsIn Stock: 1964OPA1644AIPWR Datasheet

Current PartRFQ

OP747ARUZ

Analog Devices Inc.In Stock: 19148OP747ARUZ Datasheet

MFR RecommendedRFQ

OP747ARUZ-REEL

Analog Devices Inc.In Stock: 5474OP747ARUZ-REEL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the OPA1644AIPWR are identified based on strict electrical and mechanical compatibility criteria. The following parameters define the substitution scope:

Mechanical Compatibility:

• Package type: 14-TSSOP surface mount
• Package dimensions: 0.173" × 4.40mm width
• Mounting type: Surface mount

Electrical Compatibility:

• Number of circuits: 4 independent amplifier channels
• Output configuration: Rail-to-Rail
• Operating temperature range: -40°C to 85°C
• Supply voltage span minimum: ≤4.5V
• Supply voltage span maximum: ≥36V

Compliance Requirements:

• RoHS3 compliance
• Active product status

The identified substitute parts (OP747ARUZ and OP747ARUZ-REEL) meet all mechanical and electrical compatibility criteria within the defined parameter scope. Both variants are manufactured by Analog Devices Inc. and share identical electrical specifications while differing only in packaging format (Tube versus Cut Tape & Digi-Reel®).

Parameter Comparison

Engineering Selection Recommendations

OPA1644AIPWR (Primary Part):

• Active product status with established supply (1920 units in stock)
• ROHS3 compliant
• Designed specifically for audio amplification applications
• MSL rating of 2 requires controlled storage conditions (1-year shelf life)

OP747ARUZ (Substitute - Tube Packaging):

• Active product status with higher inventory availability (19110 units in stock)
• ROHS3 compliant
• General-purpose amplifier classification with identical mechanical and core electrical compatibility
• MSL rating of 1 provides unlimited shelf life storage capability
• Tube packaging format suitable for manual assembly or lower-volume production environments

OP747ARUZ-REEL (Substitute - Cut Tape & Digi-Reel® Packaging):

• Active product status with available inventory (5455 units in stock)
• ROHS3 compliant
• General-purpose amplifier classification with identical mechanical and core electrical compatibility
• MSL rating of 1 provides unlimited shelf life storage capability
• Cut Tape & Digi-Reel® packaging format optimized for automated pick-and-place assembly equipment

All three parts satisfy the mandatory substitution criteria: 14-TSSOP package, surface mount configuration, four-channel rail-to-rail output, -40°C to 85°C operating temperature range, and ROHS3 compliance. Selection between these parts is determined by packaging format requirements and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can OP747ARUZ or OP747ARUZ-REEL be used as direct replacements for OPA1644AIPWR in existing designs?

A: Both OP747ARUZ and OP747ARUZ-REEL meet the mechanical and electrical compatibility criteria for substitution. Both devices feature identical 14-TSSOP package dimensions, four-channel configuration, rail-to-rail output, and -40°C to 85°C operating temperature range. The primary difference is packaging format (Tube versus Cut Tape & Digi-Reel®) and amplifier classification (General Purpose versus Audio-specific).

Q: What is the difference between OP747ARUZ and OP747ARUZ-REEL?

A: Both parts are manufactured by Analog Devices Inc. with identical electrical specifications. The difference is packaging format: OP747ARUZ is supplied in Tube packaging, while OP747ARUZ-REEL is supplied in Cut Tape & Digi-Reel® format. Tube packaging is suitable for manual assembly; Cut Tape & Digi-Reel® is optimized for automated assembly equipment.

Q: Are there supply voltage differences between these parts?

A: The OPA1644AIPWR operates at 4.5V to 36V supply span. The OP747ARUZ and OP747ARUZ-REEL operate at 2.7V to 30V supply span. The substitute parts have a lower minimum supply voltage (2.7V versus 4.5V) and lower maximum supply voltage (30V versus 36V). Designs operating within the 4.5V to 30V range are compatible with all three parts.

Q: What is the MSL (Moisture Sensitivity Level) difference, and does it matter?

A: OPA1644AIPWR has MSL 2 (1-year shelf life); OP747ARUZ and OP747ARUZ-REEL have MSL 1 (unlimited shelf life). MSL 2 requires controlled storage conditions and limits shelf life to one year from manufacturing. MSL 1 allows indefinite storage under standard conditions. For long-term inventory management, the substitute parts offer superior storage flexibility.

Q: Are all three parts RoHS3 compliant?

A: Yes. OPA1644AIPWR, OP747ARUZ, and OP747ARUZ-REEL are all ROHS3 compliant and suitable for applications requiring RoHS compliance.

Q: What is the difference between "Audio" and "General Purpose" amplifier classification?

A: OPA1644AIPWR is classified as an Audio amplifier, indicating optimization for audio signal processing. OP747ARUZ and OP747ARUZ-REEL are classified as General Purpose amplifiers. Both classifications operate within the same electrical and mechanical parameters specified for this substitution group. The classification reflects design optimization focus rather than functional incompatibility.