ISD25120P Equivalent & Substitute Parts

Part Overview

The ISD25120P is a voice record/playback IC from Nuvoton Technology Corporation's ChipCorder® series, designed for multiple message applications with 2-minute recording and playback duration. This device features pushbutton interface control, analog single-ended microphone input, and PWM speaker output with automatic gain control. The ISD25120P is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

ISD25120P

Nuvoton Technology CorporationIn Stock: 4892ISD25120P Datasheet

Current PartRFQ

ISD17120PY

Nuvoton Technology CorporationIn Stock: 2307ISD17120PY Datasheet

MFR RecommendedRFQ

ISD4002-120PY

Nuvoton Technology CorporationIn Stock: 1967ISD4002-120PY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ISD25120P is determined by compatibility across the following critical parameters:

• Package and Mounting: All substitute parts maintain the 28-DIP through-hole package format, ensuring direct PCB compatibility
• Functional Category: All substitutes are voice record/playback ICs within the ChipCorder® series
• Duration Capability: Substitutes must support minimum 2-minute recording/playback duration
• Interface Compatibility: Substitutes must support either pushbutton control or SPI interface for system integration
• Signal Processing: Substitutes must handle analog microphone input and speaker output
• Operating Temperature Range: All substitutes maintain 0°C ~ 70°C operating range
• Supply Voltage: Substitutes operate within overlapping or compatible voltage ranges

Two substitute parts are identified: ISD17120PY and ISD4002-120PY, each offering different feature sets and compliance profiles suitable for different application requirements.

Parameter Comparison

Engineering Selection Recommendations

ISD17120PY is the primary substitute for new designs. This part is active in production with ROHS3 compliance, addressing the obsolescence of the ISD25120P. The ISD17120PY maintains pushbutton interface compatibility while adding SPI interface capability for enhanced system integration. The extended duration range (80 ~ 240 seconds) accommodates applications requiring variable message lengths. The wider supply voltage range (2.4 V ~ 5.5 V) provides greater design flexibility compared to the original part's 4.5 V ~ 6.5 V requirement. Volume control and automatic gain control features support improved audio quality management.

ISD4002-120PY serves as an alternative substitute for applications requiring SPI-only interface control and lower supply voltage operation (2.7 V ~ 3.3 V). This part maintains the 2-minute duration specification matching the original ISD25120P. The higher sampling frequency (8kHz) and wider filter pass band (3.4kHz) support improved audio fidelity. However, the differential input signal requirement and SPI-only interface necessitate circuit redesign compared to the pushbutton-controlled original part. This substitute is suitable for battery-powered or low-voltage applications where the ISD17120PY supply voltage range exceeds system requirements.

Both substitutes are ROHS3 compliant, addressing regulatory requirements not met by the obsolete ISD25120P.

Frequently Asked Questions (FAQ)

Q: Can ISD17120PY directly replace ISD25120P without circuit modification?

A: The ISD17120PY maintains the same 28-DIP package and through-hole mounting, enabling direct PCB footprint compatibility. However, the ISD17120PY supports both pushbutton and SPI interfaces, while the original ISD25120P uses pushbutton control only. Existing pushbutton-based circuits operate without modification. SPI interface pins remain available for future system upgrades.

Q: What are the key differences between ISD17120PY and ISD4002-120PY?

A: ISD17120PY supports dual interface options (pushbutton and SPI) with supply voltage range 2.4 V ~ 5.5 V and sampling frequency 4 ~ 12kHz. ISD4002-120PY requires SPI interface only, operates at lower supply voltage (2.7 V ~ 3.3 V), and uses fixed 8kHz sampling frequency with differential input signal. ISD17120PY is preferred for applications requiring pushbutton control or flexible sampling rates.

Q: Does supply voltage compatibility affect substitution?

A: Yes. The original ISD25120P requires 4.5 V ~ 6.5 V supply. ISD17120PY accepts 2.4 V ~ 5.5 V, overlapping at 4.5 V ~ 5.5 V. ISD4002-120PY operates at 2.7 V ~ 3.3 V, incompatible with the original supply range. Verify system supply voltage before selecting ISD4002-120PY.

Q: Are both substitutes RoHS compliant?

A: Yes. Both ISD17120PY and ISD4002-120PY are ROHS3 compliant. The original ISD25120P is RoHS non-compliant. New designs must use compliant substitutes to meet current regulatory requirements.

Q: What is the duration difference between substitutes?

A: ISD17120PY supports variable duration from 80 to 240 seconds, accommodating applications requiring flexible message lengths. ISD4002-120PY maintains fixed 2-minute duration matching the original ISD25120P specification.

Q: Can ISD4002-120PY operate with pushbutton interface?

A: No. ISD4002-120PY supports SPI interface only. Applications requiring pushbutton control must use ISD17120PY or redesign the control circuit for SPI operation.