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Part	Manufacturer	Telecom IC Type	Temperature Grade	Terminal Form	No. of Terminals	Package Code	Package Shape	Package Body Material	Surface Mount	No. of Functions	Technology	Nominal Negative Supply Voltage	Maximum Supply Current	Nominal Supply Voltage	Power Supplies (V)	Package Style (Meter)	Package Equivalence Code	Sub-Category	Terminal Pitch	Maximum Operating Temperature	Fax Rate	Minimum Operating Temperature	Terminal Finish	Terminal Position	Data Rate	JESD-30 Code	Maximum Seated Height	Width	Qualification	Additional Features	JESD-609 Code	Maximum Time At Peak Reflow Temperature (s)	Peak Reflow Temperature (C)	Length
ST75C502CQFP	STMicroelectronics	MODEM-SUPPORT CIRCUIT	COMMERCIAL	GULL WING	80	LQFP	SQUARE	PLASTIC/EPOXY	YES	1	CMOS			5 V	5	FLATPACK, LOW PROFILE	QFP80,.63SQ,32	Modems	.65 mm	70 Cel	14.4 kbps	0 Cel	TIN LEAD	QUAD		S-PQFP-G80	1.6 mm	14 mm	Not Qualified	FAX RATE MIN:2.4KBPS	e0			14 mm
ST75C501CQFP	STMicroelectronics	MODEM		GULL WING	80	LQFP	SQUARE	PLASTIC/EPOXY	YES	1						FLATPACK, LOW PROFILE			.65 mm		14.4 kbps			QUAD		S-PQFP-G80	1.6 mm	14 mm	Not Qualified	FAX RATE MIN:2.4KBPS				14 mm
ST75C530FP-A	STMicroelectronics	MODEM-DATA/FAX/VOICE	COMMERCIAL	GULL WING	80	LQFP	SQUARE	PLASTIC/EPOXY	YES	1			.15 mA	5 V	5	FLATPACK, LOW PROFILE	QFP80,.64SQ	Modems	.65 mm	70 Cel	14.4 kbps	0 Cel	NICKEL PALLADIUM GOLD	QUAD	.0144 Mbps	S-PQFP-G80	1.6 mm	14 mm	Not Qualified		e4			14 mm
ST75C540FP-A	STMicroelectronics	MODEM-DATA/FAX/VOICE	COMMERCIAL	GULL WING	80	LQFP	SQUARE	PLASTIC/EPOXY	YES	1			.165 mA	5 V	5	FLATPACK, LOW PROFILE	QFP80,.64SQ	Modems	.65 mm	70 Cel	14.4 kbps	0 Cel	NICKEL PALLADIUM GOLD	QUAD	.0144 Mbps	S-PQFP-G80	1.6 mm	14 mm	Not Qualified		e4			14 mm
ST75C540TQFP	STMicroelectronics	MODEM-DATA/FAX	COMMERCIAL	GULL WING	80	LQFP	SQUARE	PLASTIC/EPOXY	YES	1			.165 mA	5 V	5	FLATPACK, LOW PROFILE	QFP80,.64SQ	Modems	.65 mm	70 Cel	14.4 kbps	0 Cel	TIN LEAD	QUAD	.0144 Mbps	S-PQFP-G80	1.6 mm	14 mm	Not Qualified		e0			14 mm
STLC75C53TQFP	STMicroelectronics	MODEM	COMMERCIAL	GULL WING	80	QFP	SQUARE	PLASTIC/EPOXY	YES				200 mA	5 V	5	FLATPACK	QFP80,.63SQ,32	Modems	.8 mm	70 Cel		0 Cel	Tin/Lead (Sn/Pb)	QUAD		S-PQFP-G80			Not Qualified		e0
ST75C530TQFP	STMicroelectronics	MODEM-DATA/FAX	COMMERCIAL	GULL WING	80	LQFP	SQUARE	PLASTIC/EPOXY	YES	1			.15 mA	5 V	5	FLATPACK, LOW PROFILE	QFP80,.64SQ	Modems	.65 mm	70 Cel	14.4 kbps	0 Cel	TIN LEAD	QUAD	.0144 Mbps	S-PQFP-G80	1.6 mm	14 mm	Not Qualified		e0			14 mm
TC35129F	Toshiba	MODEM-FAX		GULL WING	80	QFP	RECTANGULAR	PLASTIC/EPOXY	YES	1						FLATPACK			.8 mm					QUAD	.0096 Mbps	R-PQFP-G80	3.05 mm	14 mm	Not Qualified			NOT SPECIFIED	240	20 mm
TC35102F	Toshiba		COMMERCIAL	GULL WING	80	QFP	RECTANGULAR		YES		CMOS	-5 V	30 mA	5 V	+-5	FLATPACK	QFP80,.7X.9,32	Modems	.8 mm	70 Cel		-10 Cel	Tin/Lead (Sn/Pb)	QUAD		R-XQFP-G80			Not Qualified		e0
HD49428F	Renesas Electronics	MODEM-DEMODULATOR	COMMERCIAL	GULL WING	80	QFP	UNSPECIFIED	PLASTIC/EPOXY	YES	1				5 V		FLATPACK				70 Cel		0 Cel		QUAD	5.5 Mbps	X-PQFP-G80			Not Qualified
HD81905	Renesas Electronics	MODEM	COMMERCIAL EXTENDED	GULL WING	80	QFP	RECTANGULAR	PLASTIC/EPOXY	YES	1	CMOS			5 V		FLATPACK			.8 mm	75 Cel		-20 Cel		QUAD	.0024 Mbps	R-PQFP-G80	3.1 mm	14 mm	Not Qualified	DATA RATE MIN:1.2KBPS				20 mm

Modems

A modem, short for modulator-demodulator, is a device used to convert digital signals into analog signals for transmission over telephone lines or other analog communication channels. Modems can also receive and decode analog signals and convert them back into digital signals. They are used to provide internet connectivity, transmit data over long distances, and connect to remote devices.

Modems use a technique called modulation to convert digital signals into analog signals that can be transmitted over an analog communication channel. This involves changing the amplitude, frequency, or phase of the signal in response to the digital data being transmitted. At the receiving end, the modem uses a technique called demodulation to convert the analog signal back into a digital signal that can be processed by the receiving device.

Modems also use various modulation and demodulation techniques to ensure reliable and efficient transmission of data. These techniques include phase-shift keying (PSK), quadrature amplitude modulation (QAM), and frequency-shift keying (FSK), among others. The choice of modulation technique depends on the specific application and the characteristics of the communication channel being used.

There are several types of modems, including dial-up modems, cable modems, DSL modems, and wireless modems. Dial-up modems are the oldest type of modem and use the telephone network to transmit data at relatively slow speeds. Cable modems and DSL modems are used to provide high-speed internet connectivity over cable and phone lines, respectively. Wireless modems, also known as cellular modems, use wireless communication protocols to provide internet connectivity over cellular networks.

Modems are an essential technology for modern communication systems, enabling the transmission of data over a variety of communication channels and protocols. As the technology continues to evolve, we can expect to see even more advanced and innovative modems in the future.