LA321BAAD Equivalent & Substitute Parts

Part Overview

The LA321BAAD is a general purpose amplifier integrated circuit manufactured by Diodes Incorporated, housed in a SOT-23-5 surface mount package. This device is classified as obsolete and is no longer in active production. The LA321BAAD contains a single amplifier circuit designed for general purpose applications with a slew rate of 0.15V/µs and maximum output current of 40 mA per channel.

Due to its obsolete status, sourcing new units from original manufacturing channels is limited. Identifying equivalent and substitute parts ensures design continuity and maintains access to functionally compatible alternatives that meet the same electrical and mechanical requirements.

Substiute Parts

LA321BAAD

Diodes IncorporatedIn Stock: 733LA321BAAD Datasheet

Current PartRFQ

AS321KTR-G1

Diodes IncorporatedIn Stock: 210279AS321KTR-G1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LA321BAAD is determined by the following critical parameters that must align between the main part and substitute candidates:

Functional Equivalence Criteria:

• Amplifier Type: General Purpose
• Number of Circuits: 1
• Current - Output / Channel: 40 mA (minimum requirement)
• Package / Case: SC-74A, SOT-753 (mechanical compatibility)

Environmental & Compliance Criteria:

• RoHS Status: ROHS3 Compliant
• Mounting Type: Surface Mount

The AS321KTR-G1 qualifies as a manufacturer-recommended substitute based on these parameters. Both devices share identical amplifier classification, circuit count, output current capability, and package form factor. Both maintain ROHS3 compliance and surface mount technology.

Parameter Comparison

Engineering Selection Recommendations

The AS321KTR-G1 is the manufacturer-recommended substitute for the obsolete LA321BAAD. Both devices are produced by Diodes Incorporated and maintain ROHS3 compliance, ensuring regulatory alignment for new designs and production runs.

The AS321KTR-G1 is in active production status with substantial inventory availability (210,200 pieces), providing reliable long-term sourcing compared to the obsolete LA321BAAD (671 pieces remaining stock).

Key differences between the devices are documented in the parameter comparison table. The AS321KTR-G1 exhibits higher supply current (450µA versus 150µA) and operates within a reduced temperature range (-40°C ~ 85°C versus -40°C ~ 125°C). The input offset voltage specification is slightly higher (2 mV versus 1.5 mV). These differences must be evaluated against specific application requirements.

Both devices share identical output current capability (40 mA) and package form factor (SC-74A, SOT-753), supporting direct mechanical and electrical substitution in most applications.

Frequently Asked Questions (FAQ)

Q: Can the AS321KTR-G1 directly replace the LA321BAAD in existing designs?

A: The AS321KTR-G1 shares the same package form factor (SC-74A, SOT-753) and output current rating (40 mA), supporting direct mechanical substitution. Electrical compatibility depends on application-specific tolerances for supply current, input offset voltage, and operating temperature range. Review the parameter comparison table to confirm alignment with design specifications.

Q: What is the primary reason for substituting the LA321BAAD?

A: The LA321BAAD is classified as obsolete and no longer manufactured. The AS321KTR-G1 is the manufacturer-recommended active alternative, ensuring continued access to functionally equivalent general purpose amplifier circuits.

Q: Are there package compatibility concerns between the LA321BAAD and AS321KTR-G1?

A: Both devices use the SC-74A, SOT-753 package form factor, ensuring mechanical compatibility. The supplier device packages differ (SOT-23-5 versus SOT-25), but both are surface mount configurations suitable for automated assembly processes.

Q: How do the operating temperature ranges differ?

A: The LA321BAAD operates from -40°C to 125°C, while the AS321KTR-G1 operates from -40°C to 85°C. Applications requiring operation above 85°C must evaluate this specification difference against design requirements.

Q: What is the supply current difference between these devices?

A: The LA321BAAD draws 150µA supply current, while the AS321KTR-G1 draws 450µA. This threefold increase affects power consumption calculations and thermal management considerations in battery-powered or power-constrained applications.

Q: Are both devices RoHS compliant?

A: Yes, both the LA321BAAD and AS321KTR-G1 are ROHS3 compliant, meeting regulatory requirements for electronic component manufacturing and distribution.