ISD1420SY Voice Record/Playback IC Equivalent & Substitute Parts

Part Overview

The ISD1420SY is a ChipCorder® voice record/playback interface IC manufactured by Nuvoton Technology Corporation, designed for multiple-message applications with 20-second recording duration. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The ISD1420SY operates as a pushbutton-controlled voice interface with analog microphone input and PWM speaker output, suitable for consumer electronics and embedded voice messaging applications.

Substiute Parts

ISD1420SY

Nuvoton Technology CorporationIn Stock: 1188ISD1420SY Datasheet

Current PartRFQ

ISD1620BSY

Nuvoton Technology CorporationIn Stock: 9895ISD1620BSY Datasheet

MFR RecommendedRFQ

ISD1730SY

Nuvoton Technology CorporationIn Stock: 1829ISD1730SY Datasheet

MFR RecommendedRFQ

ISD1740SY

Nuvoton Technology CorporationIn Stock: 2311ISD1740SY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ISD1420SY is determined by compatibility across the following critical parameters: package type (28-SOIC form factor), supply voltage range (minimum 4.5 V support), messaging capability (multiple-message support), interface type (pushbutton control), and signal compatibility (microphone input and speaker output). The substitute parts listed maintain the same 28-SOIC package footprint and support the required voltage range, ensuring direct replacement capability in existing PCB layouts.

The ISD1730SY and ISD1740SY are primary substitutes, offering extended recording duration (60 and 80 seconds respectively) while maintaining the 28-SOIC package and multiple-message functionality. Both parts support the full 4.5 V ~ 5.5 V supply range and include additional features such as SPI interface and volume control. The ISD1620BSY is an alternative substitute with reduced package size (16-SOIC) and single-message capability, suitable for applications where physical space is constrained and multiple-message functionality is not required.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement in existing ISD1420SY designs, the ISD1730SY and ISD1740SY are the primary substitutes. Both parts maintain the 28-SOIC package footprint, support multiple-message functionality, and are classified as active products with ROHS3 compliance. The ISD1730SY provides 60-second recording capacity, while the ISD1740SY extends this to 80 seconds. Both include SPI interface capability and volume control features not present in the original ISD1420SY.

The ISD1620BSY serves as an alternative substitute for space-constrained applications. This part uses a smaller 16-SOIC package and operates within the same temperature and voltage ranges. However, the ISD1620BSY supports only single-message functionality, making it unsuitable for applications requiring multiple independent voice messages.

All substitute parts are manufactured by Nuvoton Technology Corporation within the ChipCorder® series and maintain REACH compliance. The ISD1730SY and ISD1740SY are recommended for applications requiring direct form-factor compatibility and multiple-message capability. The ISD1620BSY is recommended only when package size reduction is a primary design constraint and single-message operation is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the ISD1730SY or ISD1740SY be used as direct replacements for the ISD1420SY?

A: Yes. Both parts use the same 28-SOIC package footprint and maintain compatibility with the 4.5 V ~ 5.5 V supply voltage range. PCB layout modifications are not required. The ISD1730SY and ISD1740SY provide extended recording duration and additional features such as SPI interface and volume control.

Q: What is the key difference between the ISD1730SY and ISD1740SY?

A: The primary difference is recording duration. The ISD1730SY supports 20 ~ 60 seconds, while the ISD1740SY supports 26 ~ 80 seconds. Both parts share identical package, interface, and electrical specifications.

Q: Why is the ISD1620BSY listed as a substitute if it uses a different package?

A: The ISD1620BSY is listed as an alternative substitute for applications where package size reduction is acceptable. The 16-SOIC package is smaller than the 28-SOIC, reducing PCB footprint. However, this part supports only single-message functionality, limiting its use to applications not requiring multiple independent voice messages.

Q: Are all substitute parts RoHS compliant?

A: The ISD1730SY and ISD1740SY are ROHS3 compliant. The ISD1620BSY is also ROHS3 compliant. All parts maintain REACH compliance.

Q: What is the minimum supply voltage for the substitute parts?

A: The ISD1730SY and ISD1740SY support a minimum supply voltage of 2.4 V, compared to the ISD1420SY minimum of 4.5 V. The ISD1620BSY also supports 2.4 V minimum. This extended lower voltage range provides additional design flexibility for battery-powered applications.

Q: Do the substitute parts support the same microphone input and speaker output signals as the ISD1420SY?

A: Yes. All substitute parts accept microphone input and provide PWM speaker output. The ISD1730SY and ISD1740SY additionally support analog single-ended output, providing expanded output options.