ISD1420P Voice Record/Playback IC Equivalent & Substitute Parts

Part Overview

The ISD1420P is a ChipCorder® voice record/playback interface IC manufactured by Nuvoton Technology Corporation, designed for multiple message recording and playback applications with a 20-second duration capacity. This device features pushbutton control, analog microphone input, and PWM speaker output with automatic gain control.

The ISD1420P is classified as obsolete. Identifying suitable substitute parts is necessary to support ongoing system maintenance, design updates, and new production requirements where this component is no longer readily available or preferred for new designs.

Substiute Parts

ISD1420P

Nuvoton Technology CorporationIn Stock: 17448ISD1420P Datasheet

Current PartRFQ

ISD1740PY

Nuvoton Technology CorporationIn Stock: 944ISD1740PY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ISD1420P is determined by the following critical parameters:

Mechanical Compatibility:

• Package type: 28-DIP (0.600", 15.24mm)
• Mounting type: Through Hole
• Pin count and footprint must match for direct board-level replacement

Functional Compatibility:

• Voice record/playback interface capability
• Multiple message support
• Pushbutton control interface
• Microphone input and speaker output signal types
• Internal oscillator configuration

Electrical Compatibility:

• Supply voltage range overlap (ISD1420P operates 4.5 V ~ 5.5 V)
• Operating temperature range (0°C ~ 70°C)

Performance Parameters:

• Duration capacity (ISD1420P: 20 seconds)
• Sampling frequency (ISD1420P: 6.4 kHz fixed)
• Filter characteristics

The ISD1740PY qualifies as a manufacturer-recommended substitute based on identical mechanical packaging (28-DIP), compatible functional architecture (voice record/playback with multiple messages), and overlapping electrical specifications. The ISD1740PY provides extended duration (26 ~ 80 seconds) and broader sampling frequency range (4 ~ 12 kHz), making it suitable for applications requiring the core ISD1420P functionality.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: The ISD1740PY is the manufacturer-recommended substitute for the ISD1420P. Both devices share identical 28-DIP packaging and through-hole mounting, enabling direct board-level substitution without PCB redesign.

Product Status Consideration: The ISD1420P is obsolete, while the ISD1740PY maintains active production status. Selection of the ISD1740PY ensures long-term component availability and supply chain continuity.

Compliance Advantage: The ISD1740PY is ROHS3 compliant, whereas the ISD1420P is RoHS non-compliant. New designs and systems subject to RoHS requirements must use the ISD1740PY.

Electrical Compatibility: The ISD1740PY operates across a broader supply voltage range (2.4 V ~ 5.5 V) compared to the ISD1420P (4.5 V ~ 5.5 V). Systems powered at 4.5 V or higher maintain full compatibility. Systems operating below 4.5 V require the ISD1740PY.

Functional Enhancement: The ISD1740PY provides extended recording duration (26 ~ 80 seconds versus 20 seconds) and configurable sampling frequency (4 ~ 12 kHz versus fixed 6.4 kHz). These capabilities support applications requiring longer message storage or variable audio quality settings. The addition of SPI interface and volume control provides enhanced system integration options.

Frequently Asked Questions (FAQ)

Q: Can the ISD1740PY directly replace the ISD1420P on existing PCBs?

A: Yes. Both devices use identical 28-DIP (0.600", 15.24mm) through-hole packaging. Pin-for-pin compatibility for core voice record/playback functions is maintained. However, verify that your application does not require the specific 20-second duration or 6.4 kHz sampling frequency of the original ISD1420P, as the ISD1740PY offers different specifications in these parameters.

Q: What are the key differences between ISD1420P and ISD1740PY?

A: The ISD1740PY provides extended recording duration (26 ~ 80 seconds), configurable sampling frequency (4 ~ 12 kHz), additional SPI interface option, volume control feature, lower minimum supply voltage (2.4 V), and ROHS3 compliance. The ISD1420P offers fixed 20-second duration and 6.4 kHz sampling frequency.

Q: Is the ISD1740PY suitable for applications requiring exactly 20 seconds of recording time?

A: Yes. The ISD1740PY supports durations from 26 to 80 seconds, which encompasses the 20-second requirement of the original ISD1420P. Configure the device for 20-second operation within its supported range.

Q: What is the impact of the ISD1420P being obsolete?

A: Obsolete status indicates the manufacturer no longer produces this component. Existing inventory may be limited and pricing may increase. The ISD1740PY, as an active product, ensures reliable long-term availability and stable pricing for new production and replacement applications.

Q: Does the ISD1740PY require different PCB layout or design considerations?

A: No. The identical 28-DIP package and through-hole mounting type eliminate layout changes. Verify that your circuit design accommodates the ISD1740PY's expanded feature set (SPI interface, volume control) if these are not utilized in your application.

Q: Are there RoHS compliance implications when switching from ISD1420P to ISD1740PY?

A: Yes. The ISD1420P is RoHS non-compliant, while the ISD1740PY is ROHS3 compliant. Systems subject to RoHS regulations must transition to the ISD1740PY. Existing systems using the ISD1420P may continue operation without regulatory impact.