ISD4002-120PY from Nuvoton Tech, in a DIP-28. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	SS	input	Slave Select: when LOW, this input selects the ISD4002 device.
2	MOSI	input	Master Out Slave In: serial data input to the device in slave mode, with data placed by the master one half-cycle before the SCLK rising edge.
3	MISO	tri_state	Master In Slave Out: serial data output of the device, which goes to a high-impedance state when the device is not selected.
4	VSSD	power_in	Digital ground, connected through a separate low-impedance path to power supply ground, with impedance to the VSSA pins less than 3 Ω.
5	NC	unconnected	Not connected.
6	NC	unconnected	Not connected.
7	NC	unconnected	Not connected.
8	NC	unconnected	Not connected.
9	NC	unconnected	Not connected.
10	NC	unconnected	Not connected.
11	VSSA	power_in	Analog ground, to be tied together with the other VSSA pins as close as possible and connected through a low-impedance path to power supply ground.
12	VSSA	power_in	Analog ground, to be tied together with the other VSSA pins as close as possible and connected through a low-impedance path to power supply ground.
13	AUD OUT	output	Audio output of the stored data, recommended to be AC coupled and capable of driving a load as small as 5 kΩ in playback; the pin is always at 1.2 V when powered up.
14	AM CAP	passive	AutoMute capacitor pin, where a 1 µF capacitor to ground is recommended; connecting this pin directly to VCCA disables the AutoMute feature.
15	NC	unconnected	Not connected.
16	ANA IN-	input	Inverting analog input for differential recording, with a 16 mVp-p maximum input signal and a normal input impedance of 56 kΩ.
17	ANA IN+	input	Non-inverting analog input for recording, with a 32 mVp-p maximum signal in single-ended mode and 16 mVp-p maximum in differential mode.
18	VCCA	power_in	Analog +3 V supply, to be tied together with VCCD as close to the supply as possible and decoupled close to the package.
19	NC	unconnected	Not connected.
20	NC	unconnected	Not connected.
21	NC	unconnected	Not connected.
22	NC	unconnected	Not connected.
23	VSSA	power_in	Analog ground, to be tied together with the other VSSA pins as close as possible and connected through a low-impedance path to power supply ground.
24	RAC	output	Row Address Clock, an open-drain output with a 200 ms period at 8 kHz sampling that requires a pull-up resistor to connect to other devices.
25	INT	output	Interrupt, an open-drain output that goes and stays LOW on an Overflow or End of Message marker and requires a pull-up resistor.
26	XCLK	input	External clock input, which for the ISD4002-120 is 1024 kHz and must be connected to ground if not used.
27	VCCD	power_in	Digital +3 V supply, to be tied together with VCCA as close to the supply as possible and decoupled close to the package.
28	SCLK	input	Serial Clock input from the master device, with data latched on the rising edge and shifted out on the falling edge.

Key specifications

Parameter	Value
Manufacturer	Nuvoton Tech
Package	DIP-28
Category	Communication Interface Chip/UART/485/232
Pins	28

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Supply voltage	VCC	2.7		3.3	V	[1] VCC = VCCA = VCCD	19
Commercial operating temperature range (case)		0		70	ºC	Commercial packaged units	19
Supply voltage VCC - VSS	VCC - VSS	-0.3		7	V		18
Voltage applied to MOSI, SCLK, and SS pins				5.5	V	Input current limited to ±20mA	18
Junction temperature				150	ºC		18
Storage temperature range		-65		150	ºC		18
Lead temperature (soldering)				300	ºC	soldering, 10 seconds	18
Output Low Voltage	VOL			0.4	V	IOL = 10 µA	20
RAC, INT Output Low Voltage	VOL1			0.4	V	IOL = 1 mA	20
VCC Current (Operating) - Playback	ICC		15	30	mA	Playback; REXT = ∞ [3]	20
VCC Current (Operating) - Record	ICC		25	40	mA	Record; REXT = ∞ [3]	20
VCC Current (Standby)	ISB		1	10	µA	[3] [4]	20
Input Leakage Current	IIL	-1		1	µA		20
MISO Tristate Current	IHZ		1	10	µA		20
Output Load Impedance	REXT	5			KΩ		20
ANA IN+ Input Resistance	RANA IN+	2.2	3	3.8	KΩ		20
ANA IN- Input Resistance	RANA IN-	40	56	71	KΩ		20
ANA IN+ or ANA IN- to AUD OUT Gain	AARP	20	23	26	dB	1 KHz sinewave input [5]	20
Sampling Frequency (ISD4002-120)	FS		8		KHz	[5]	21
Filter Pass Band (ISD4002-120)	FCF		3.4		KHz	3 dB Roll-Off Point [3][7]	21
Record Duration (ISD4002-120)	TREC		120		sec	[6]	21
Playback Duration (ISD4002-120)	TPLAY		120		sec	[6]	21
Power-Up Delay (ISD4002-120)	TPUD		25		msec		21
Stop or Pause in Record or Play (ISD4002-120)	TSTOP or TPAUSE		50		msec		21
RAC Clock Period (ISD4002-120)	TRAC		200		msec	[10]	21
RAC Clock Low Time (ISD4002-120)	TRACL		25		msec		21
RAC Clock Period in Message Cueing Mode (ISD4002-120)	TRACM		125		µsec		21
RAC Clock Low Time in Message Cueing Mode (ISD4002-120)	TRACML		15.63		µsec		21
Total Harmonic Distortion	THD		1	2	%	@ 1 KHz sinewave	21
ANA IN Input Voltage	VIN			32	mV Peak-to-Peak	[4] [8] [9]	21

CAD (KiCad official)

Symbol: ISD4002-120PY
Footprint: Package_DIP:DIP-28_W7.62mm
3D model: DIP-28 (KiCad packages3D, STEP)
3D model files: isd4002-120py-etched.step / isd4002-120py-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); isd4002-120py.step / isd4002-120py.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Nuvoton Tech datasheet (33 pp, sha256 d68fa2e09a581f87, retrieved 2026-10-30, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

ISD4002-120PY

Verified ISD4002-120PY

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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