AK4381VT Equivalent & Substitute Parts

Part Overview

The AK4381VT is a 24-bit digital-to-analog converter (DAC) with 2 channels, designed for data acquisition applications. It features differential voltage output, serial data interface, and sigma-delta architecture. The device operates across a supply voltage range of 4.75V to 5.25V for both analog and digital domains, with an operating temperature range of -40°C to 85°C.

The AK4381VT is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production or maintenance requirements for systems utilizing this DAC.

Substiute Parts

AK4381VT

Asahi Kasei Microdevices/AKMIn Stock: 2536AK4381VT Datasheet

Current PartRFQ

AK4432VT

Asahi Kasei Microdevices/AKMIn Stock: 9370AK4432VT Datasheet

MFR RecommendedRFQ

AK4452VN

Asahi Kasei Microdevices/AKMIn Stock: 1449AK4452VN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AK4381VT are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Manufacturer: Asahi Kasei Microdevices (AKM) — maintains design continuity within the same product family
• Number of D/A Converters: 2 channels — preserves dual-channel functionality
• Mounting Type: Surface Mount — ensures PCB assembly compatibility
• Package Category: 16-TSSOP or compatible form factor — maintains footprint compatibility where applicable
• Product Status: Active — ensures ongoing availability and support

Secondary Compatibility Parameters:

• Data Interface: Serial or I2S — both support digital audio/data transmission protocols
• Architecture: Sigma-Delta — maintains signal processing methodology
• Operating Temperature Range: Minimum -40°C to support extended industrial applications
• Moisture Sensitivity Level: MSL 2 — consistent handling and storage requirements

The substitute parts AK4432VT and AK4452VN are both active AKM DAC products with dual-channel architecture. While they feature enhanced resolution (32-bit vs. 24-bit) and higher sampling rates, they maintain core functional compatibility through shared manufacturer lineage, dual-channel configuration, and surface-mount packaging.

Parameter Comparison

Engineering Selection Recommendations

AK4432VT Selection Criteria: The AK4432VT maintains the 16-TSSOP package footprint, enabling direct PCB layout compatibility. This substitute offers 32-bit resolution and I2S interface support. The device is ROHS3 compliant and carries active product status, ensuring long-term availability. Supply voltage requirements (3V ~ 3.6V) differ from the original specification and require power supply redesign. Operating temperature range extends to 105°C, providing enhanced thermal margin for industrial applications.

AK4452VN Selection Criteria: The AK4452VN provides the highest resolution (32-bit) and sampling rate (768k) among available substitutes, with support for both DSD and I2S interfaces. The 32-QFN package represents a form factor change from the original 16-TSSOP, requiring PCB redesign. Supply voltage range (1.7V ~ 5.5V) offers maximum flexibility and backward compatibility with 5V systems. ROHS3 compliance and active product status ensure regulatory alignment and component availability. Operating temperature extends to 105°C.

Compliance Considerations: Both substitute parts carry ROHS3 compliance certification, meeting current environmental and regulatory requirements. The AK4381VT lacks specified RoHS status due to its obsolete classification. Both substitutes maintain MSL 2 classification, consistent with the original device.

Frequently Asked Questions (FAQ)

Q: Can the AK4432VT directly replace the AK4381VT without PCB modifications?

A: The AK4432VT shares the 16-TSSOP package footprint with the AK4381VT, allowing direct pin-compatible substitution on the PCB. However, the supply voltage requirement differs (3V ~ 3.6V vs. 4.75V ~ 5.25V), necessitating power supply circuit redesign. The data interface change from serial to I2S requires firmware or controller logic modification.

Q: What are the key differences between the AK4432VT and AK4452VN?

A: The AK4432VT maintains the 16-TSSOP package and operates at 192k sampling rate with I2S interface. The AK4452VN uses a larger 32-QFN package, supports 768k sampling rate, and offers dual interface capability (DSD and I2S). The AK4452VN provides wider supply voltage range (1.7V ~ 5.5V) compared to the AK4432VT (3V ~ 3.6V).

Q: Is package compatibility a critical factor in selecting a substitute?

A: Package compatibility determines PCB redesign requirements. The AK4432VT (16-TSSOP) maintains footprint compatibility with the original AK4381VT, reducing layout modifications. The AK4452VN (32-QFN) requires complete PCB redesign but offers superior performance specifications and wider supply voltage range.

Q: Do both substitute parts support the same data interface as the original AK4381VT?

A: No. The AK4381VT uses a serial data interface, while both substitutes employ I2S (AK4432VT) or I2S/DSD (AK4452VN) interfaces. System controller firmware must be updated to support the new interface protocol.

Q: Are there supply voltage compatibility concerns with these substitutes?

A: Yes. The AK4381VT operates at 4.75V ~ 5.25V. The AK4432VT requires 3V ~ 3.6V, necessitating a separate low-voltage supply rail. The AK4452VN accepts 1.7V ~ 5.5V, providing flexibility for both 3.3V and 5V systems without additional power supply modification.

Q: What is the impact of resolution upgrade from 24-bit to 32-bit?

A: Both substitutes offer 32-bit resolution compared to the original 24-bit specification. This provides enhanced dynamic range and signal-to-noise ratio. System firmware and digital signal processing chains must be configured to utilize the additional resolution bits; otherwise, the upgrade provides no functional benefit.

Q: Are both substitute parts suitable for industrial temperature applications?

A: Yes. Both AK4432VT and AK4452VN support -40°C to 105°C operating temperature range, exceeding the original AK4381VT specification (-40°C to 85°C). This provides enhanced thermal margin for extended industrial and automotive applications.