ISD1760SY - 60s Voice Record/Playback IC 2.4-5.5V | Nuvoton
MPN: ISD1760SY ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.36 | $336.00 |
| 500 | $3.02 | $1,510.00 |
| 1,000 | $2.69 | $2,690.00 |
ISD1760SY Overview
What is a voice record/playback IC? A voice record/playback IC is a single-chip audio subsystem that captures analog microphone input, digitizes and stores the audio in on-chip non-volatile memory, and reconstructs the analog waveform on demand. It sits hierarchically under interface ICs -> audio ICs -> signal chain semiconductors, and is distinct from MP3/WAV codec ICs because storage is performed entirely on-chip using Nuvoton's patented multilevel storage (MLS) technology.
Key features of the ISD1760SY include user-selectable 4 kHz, 6.4 kHz, 8 kHz, and 12 kHz sampling rates that trade recording duration for audio bandwidth, a 120-second maximum duration at the lowest sample rate (mode dependent), built-in push-button interface with debounce logic, an SPI-compatible control port for MCU-driven playback, and integrated class-D-compatible PWM output capable of driving a small speaker directly through an external transistor or buffer. Standby current is below 1 uA, making it well suited to battery-powered products.
The device uses Nuvoton's zero-power-message storage scheme that retains recorded audio without any supply current and supports random-address message playback for systems that require multiple prompts. The internal architecture combines a switched-capacitor anti-alias filter ahead of the storage array and a smoothing filter on playback, removing the need for external op-amps in most designs.
Typical applications include voice-prompt industrial control panels, elevator floor announcers, security alarm annunciators, talking toys, medical device audio feedback, and consumer appliance voice prompts. Designers select the ISD1760SY when they need a self-contained voice subsystem without DSP overhead or external Flash storage.
When designing in this part, observe the 2.4 V minimum supply and ensure the speaker driver transistor is sized for the expected load. The push-button interface supports up to six direct-trigger inputs, reducing GPIO demand on the host MCU and simplifying front-panel wiring in stand-alone playback designs.
This page synthesizes XAIPART distributor pricing, drop-in same-brand alternatives from the Nuvoton ISD1700 family, and practical design notes that are not consolidated on a single manufacturer datasheet page.
Drop-in alternatives for ISD1760SY — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ISD1760SY (same form factor and footprint) — differing in Interface, Operating Temperature, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISD17120SY
✅ Drop-In✓ In Stock
$4.12 / Unit
View Datasheet →ISD17100SY
✅ Drop-In📋 Reference alternative (not in catalog)
ISD1750SY
✅ Drop-In📋 Reference alternative (not in catalog)
ISD1740SY
✅ Drop-In📋 Reference alternative (not in catalog)
ISD1760SY Specifications
| Manufacturer | Nuvoton Technology Corporation |
| Part Number | ISD1760SY |
| Function | Single-chip multi-message voice record & playback |
| Recording Duration | 60 s (typical, mode dependent; up to 120 s at lowest sample rate per family datasheet) |
| Supply Voltage (VDD) | 2.4 V to 5.5 V |
| Supply Current (operating) | 670 mW max dissipation rating (distributor figure) |
| Standby Current | < 1 uA (typical) |
| Sampling Frequency | 4 kHz / 6.4 kHz / 8 kHz / 12 kHz selectable |
| Interface | SPI (control) + pushbutton (direct trigger) |
| Audio Input | Differential microphone preamplifier with AGC |
| Audio Output | PWM speaker driver (requires external transistor/buffer) |
| Message Storage | On-chip non-volatile multilevel storage (MLS) |
| Pushbutton Inputs | 6 direct-trigger pins with internal debounce |
| Operating Temperature | -40 C to +85 C (industrial, per family datasheet) |
| Package | 28-pin SOIC, 300 mil |
| Lead-Free / RoHS | Lead-free (Pb-free), RoHS compliant |
ISD1760SY Pin Configuration
| Pin 1 | /REC — Pushbutton record input (active low, internal pull-up) |
| Pin 2 | /PLAY — Pushbutton play input (active low, internal pull-up) |
| Pin 3 | /ERASE — Pushbutton erase input (active low, internal pull-up) |
| Pin 4 | /FWD — Pushbutton forward/next-message input |
| Pin 5 | /VOL — Pushbutton volume input (cycles loudness levels) |
| Pin 6 | /RESET — Pushbutton reset to message 1 |
| Pin 7 | MIC+ — Differential microphone positive input |
| Pin 8 | MIC- — Differential microphone negative input |
| Pin 9 | AGC — Automatic gain control capacitor node |
| Pin 10 | VREF — Analog reference (decouple to GND) |
| Pin 11 | GND — Ground |
| Pin 12 | VDD — Positive supply 2.4 V to 5.5 V |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | SCLK — SPI clock input |
| Pin 16 | MOSI — SPI master-out slave-in data |
| Pin 17 | MISO — SPI master-in slave-out data |
| Pin 18 | /SS — SPI slave select (active low) |
| Pin 19 | /INT — Interrupt output to host MCU |
| Pin 20 | /RAC — Row-address clock output (end-of-message indicator) |
| Pin 21 | /LED — LED drive output (record/playback indicator) |
| Pin 22 | AUX — Auxiliary analog input |
| Pin 23 | SP+ — PWM speaker output (positive) |
| Pin 24 | SP- — PWM speaker output (negative) |
| Pin 25 | VCCPA — PWM driver supply (connect to VDD) |
| Pin 26 | NC — Not connected (per datasheet) |
| Pin 27 | NC — Not connected (per datasheet) |
| Pin 28 | GNDPA — PWM driver ground |
Typical Applications
ISD1760SY is suitable for 6 applications: Industrial Control Panel Voice Prompts, Elevator Floor Announcer, Security Alarm Annunciator, Talking Toy / Consumer Appliance Voice Prompt, Medical Device Audio Feedback, Automotive Aftermarket Voice Alert Module.
Industrial Control Panel Voice Prompts
The ISD1760SY suits industrial control panel voice prompts where a maintenance alarm must announce fault conditions in plain language. The 60 second recording budget fits dozens of short prompts for alarms, status messages, and operator guidance, while the 2.4-5.5 V supply matches 24 V-to-5 V or 12 V-to-5 V industrial rails after regulation. The integrated pushbutton interface lets installers wire physical panel buttons directly to the IC without using an MCU GPIO, reducing BOM cost. With 4 kHz to 12 kHz sample-rate selection and on-chip AGC, audio stays intelligible across noisy factory floors, and zero-power-message storage ensures prompts survive power-down indefinitely for reliable unattended operation.
Recommended
Elevator Floor Announcer
In elevator floor announcer designs the ISD1760SY stores pre-recorded floor names, direction prompts, and safety messages that play when the cab arrives at a landing. The 60 second duration fits 16 floors of prompts plus courtesy messages, with the SPI port letting the elevator controller select which message to play per floor. Six pushbutton inputs provide redundant manual triggers for testing without the controller online. The PWM output drives a small cab speaker through a single transistor buffer, while the 2.4-5.5 V supply runs directly from a 5 V standby rail commonly present in elevator control cabinets. Nuvoton's zero-power retention guarantees announcements remain intact across long maintenance shutdowns.
Recommended
Security Alarm Annunciator
The ISD1760SY gives security alarm systems a clear spoken voice for breach alerts, chime tones, and voice prompts, replacing annoying beeps with intelligible warnings. The 60 second budget covers many zone-specific messages, and six direct-trigger pins let the alarm panel wire zone inputs straight to the IC for redundant independent triggering when the host MCU is faulted. The on-chip AGC equalizes message loudness across voices, and the 2.4-5.5 V supply draws from a 12 V-backed alarm rail via a simple LDO. Standby current below 1 uA ensures the voice module does not drain backup batteries during long AC outages, which is essential for UL-listed alarm installations requiring multi-day standby.
Recommended
Talking Toy / Consumer Appliance Voice Prompt
The ISD1760SY is a natural fit for talking toys and small consumer appliances that need pre-recorded phrases or sound effects triggered by button presses or sensors. Its 60 second storage fits dozens of toy phrases, animal sounds, or appliance status messages, while the integrated microphone preamp with AGC lets designers record new content on the production line without external circuitry. The SOIC-28 (300 mil) package fits easily into toy enclosures, and 2.4-5.5 V operation runs from two AA cells or a single Li-ion. The pushbutton interface lets kids press big buttons to trigger messages without an MCU, simplifying toy electronics and reducing cost in high-volume consumer builds.
Recommended
Medical Device Audio Feedback
In medical devices such as blood pressure monitors, glucose meters, and pill dispensers, the ISD1760SY delivers clear voice feedback to patients who may struggle to read small LCD text. Its 60 second storage fits dozens of measurement-result prompts and warning messages in multiple languages, and the SPI port lets the host MCU update playback selection as measurements progress. The 2.4-5.5 V supply runs from common 3 V coin cells or Li-ion packs, and sub-1 uA standby preserves battery life across multi-month deployment. The on-chip AGC normalizes prompt loudness so elderly patients hear messages consistently, while the pushbutton interface allows blind users to replay measurements via a single tactile button.
Recommended
Automotive Aftermarket Voice Alert Module
The ISD1760SY adds voice alerts to aftermarket automotive accessories such as parking sensors, radar detectors, and tire-pressure displays where spoken warnings are safer than beeps while driving. The 60 second duration stores many alert phrases and the 2.4-5.5 V supply runs directly from a 12 V-to-5 V regulator found in most car accessory harnesses. Six pushbutton inputs accept direct wiring from accessory trigger outputs, and the SPI port allows firmware updates when paired with a small host MCU. Zero-power-message storage keeps recorded voice intact through long vehicle parking periods, and the SOIC-28 footprint fits inside compact accessory housings that mount behind dashboards or under bumpers for discreet installation.
Recommended
Recommended Products Summary
Engineering reference data for ISD1760SY — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISD17120SY | ISD17100SY | ISD1750SY | ISD1740SY |
|---|---|---|---|---|---|
| Brand | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation |
| Package | SOIC-28 (300 mil) | SOIC-28 (300 mil) | SOIC-28 (300 mil) | SOIC-28 (300 mil) | SOIC-28 (300 mil) |
| Recording Duration | 60 s | 120 s | 100 s | 50 s | 40 s |
| Supply Voltage | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V |
| Sampling Frequency | 4 kHz / 6.4 kHz / 8 kHz / 12 kHz | 4 kHz / 6.4 kHz / 8 kHz / 12 kHz | 4 kHz / 6.4 kHz / 8 kHz / 12 kHz | 4 kHz / 6.4 kHz / 8 kHz / 12 kHz | 4 kHz / 6.4 kHz / 8 kHz / 12 kHz |
| Interface | SPI + 6 pushbutton inputs | SPI + 6 pushbutton inputs | SPI + 6 pushbutton inputs | SPI + 6 pushbutton inputs | SPI + 6 pushbutton inputs |
| Standby Current | < 1 uA | < 1 uA | < 1 uA | < 1 uA | < 1 uA |
| Lead-Free / RoHS | Yes (Pb-free) | Yes (Pb-free) | Yes (Pb-free) | Yes (Pb-free) | Yes (Pb-free) |
| Approx. Unit Price @ 1000 | USD 2.69 | USD ~3.20 (estimated, not in web data) | USD ~3.05 (estimated, not in web data) | USD ~2.50 (estimated, not in web data) | USD ~2.40 (estimated, not in web data) |
Key Differentiators
- Balanced capacity and cost in the ISD1700 family (vs ISD17120SY)
- Six pushbutton inputs reduce host-MCU GPIO demand (vs ISD1740SY)
- Integrated microphone preamp with AGC (vs ISD1750SY)
Design Notes
Estimated: Decouple VDD with a 10 uF X5R ceramic plus a 100 nF ceramic placed within 3 mm of the VDD pin (pin 12) and a separate 10 uF on VCCPA (pin 25) for the PWM driver section. The two ground pins (GND pin 11 and GNDPA pin 28) should be tied together with a wide short trace; do not split grounds since both analog and PWM sections share the same silicon substrate and any ground bounce couples into the microphone path.
Do not connect a speaker directly to the SP+/SP- pins: the ISD1760SY outputs a PWM waveform that requires an external NPN transistor or audio buffer to drive an 8 ohm speaker. Driving a speaker directly produces a low-volume, distorted result and risks damaging the IC's PWM output stage. Reference the typical-application circuit in the Nuvoton ISD1700 datasheet which uses a single NPN transistor with a 1 k base resistor and 100 uF output coupling capacitor.
Route the microphone traces (MIC+, MIC-) as a short differential pair with ground shielding to avoid picking up 50/60 Hz hum and PWM switching noise from the SP+/SP- lines. Keep digital SPI traces away from the analog MIC inputs by at least 5 mm, and place the AGC capacitor (pin 9) and VREF capacitor (pin 10) close to their respective pins with short ground returns. The pushbutton traces can be longer but should be guarded with a ground trace if they run near PWM switching signals.
Recorded audio is retained without supply current (zero-power-message storage) but the part must enter the proper power-down state for retention to be guaranteed. According to the Nuvoton ISD1700 datasheet, executing a STOP or PD command via SPI before removing VDD ensures clean retention; simply removing power mid-record may corrupt the current message. Always issue a stop command in firmware before power-cycling or switching the host MCU between active and standby modes.
Compliance Information
Pb-free and RoHS compliant per Mouser listing (798-ISD1760SY) and Nuvoton product documentation. AEC-Q100 qualification is not stated; this part is intended for industrial and consumer applications, not automotive safety-critical use. Halogen-free status was not present in the verified web data and is marked unknown.
