Interface - Signal Terminators

Part Number	Description / PDF	Quantity
UCC5606DP/81217 Texas Instruments	ANALOG INTERFACE	3460
TL2218-285PWR Texas Instruments	TL2218-285 CURRENT-MODE SCSI TER	3970
UCC5622MWPTR Texas Instruments	SCSI TERMINATOR, 27-LINE, 110OHM	20000
UCC5618PWPTR/2 Texas Instruments	ANALOG INTERFACE	3913
UCC5640PW28TR Texas Instruments	SCSI TERMINATOR, 9-LINE, 105OHM	4000
UC5601QP Texas Instruments	SCSI TERMINATOR, 18-LINE, 110OHM	6389
UCC5673MWP Texas Instruments	SCSI TERMINATOR, 9-LINE, 105OHM	6852
UCC5617DWP Texas Instruments	SCSI TERMINATOR, 18-LINE, 110OHM	14558
UCC5686PM Texas Instruments	SCSI TERMINATOR, 27-LINE, 105OHM	13888
UC5608N Texas Instruments	SCSI TERMINATOR, 18-LINE, 110OHM	0
UCC5630AFQPTR Texas Instruments	SCSI TERMINATOR, 9-LINE, 105OHM	6000
UCC5629FQPG4 Texas Instruments	SCSI TERMINATOR, 14-LINE, 105OHM	1248
UCC5639FQPTR Texas Instruments	SCSI TERMINATOR, 15-LINE, 105OHM	26000
UCC5610QP Texas Instruments	SCSI TERMINATOR, 18-LINE, 110OHM	3219
UCC5680PW28TR Texas Instruments	SCSI TERMINATOR, 9-LINE, 105OHM	14000
UC5612PWP Texas Instruments	SCSI TERMINATOR, 9-LINE	1800
UCC5680PW24TR Texas Instruments	SCSI TERMINATOR, 9-LINE, 105OHM	10000
UCC5631AMWPTR Texas Instruments	SCSI TERMINATOR, 9-LINE, 105OHM	10830
UCC5630MWP Texas Instruments	SCSI TERMINATOR, 9-LINE, 105OHM6	4059
UCC5639FQP Texas Instruments	SCSI TERMINATOR, 15-LINE, 105OHM	8582

Interface - Signal Terminators

1. Overview

Signal terminators are specialized integrated circuits designed to match impedances and suppress signal reflections in high-speed transmission lines. They play a critical role in maintaining signal integrity by ensuring that voltage and current signals propagate without distortion. These devices are essential in modern electronics, particularly in applications requiring high-frequency data transmission, such as telecommunications, computing, and industrial automation.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Resistive Terminators	Fixed or adjustable resistors to match transmission line impedance	DDR memory interfaces, RS-485 buses
Capacitive Terminators	Block DC signals while allowing AC signals to pass	High-speed ADC/DAC interfaces
Active Terminators	Dynamic impedance adjustment with voltage regulation	Fiber optic communication systems
Differential Terminators	Balanced termination for differential signaling	Ethernet (10GBASE-T), USB 3.0

3. Structure and Composition

Signal terminators typically consist of: - Precision resistors/capacitors embedded in silicon or ceramic substrates. - Package housing (e.g., SMT, TSSOP) with thermal dissipation features. - Internal ESD protection layers to prevent voltage spikes. - Multi-layer metallization for high-frequency signal routing.

4. Key Technical Specifications

Parameter	Description
Termination Resistance ( )	Matches transmission line impedance (e.g., 50 , 75 , 100 ).
Frequency Range (GHz)	Determines suitability for high-speed applications (e.g., 0.1-10 GHz).
Power Handling (W)	Maximum power dissipation without thermal degradation.
Capacitance (pF)	Affects signal rise/fall time in capacitive terminators.
Impedance Tolerance (%)	Accuracy of impedance matching (e.g., 2%, 5%).

5. Application Fields

Telecommunications: 5G base stations, optical transceivers.
Computing: Motherboard PCIe interfaces, GPU memory buses.
Industrial: PLCs, motor drive signal lines.
Automotive: CAN FD bus systems, ADAS sensors.

Case Study: In 10GBASE-T Ethernet, differential terminators ensure 100 impedance matching to reduce crosstalk and bit error rates.

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
TI (Texas Instruments)	SN75LBC176	RS-485 line driver with integrated termination
Analog Devices	ADN4661	Low-power LVDS signal terminator
Infineon Technologies	TLE5012B	Automotive CAN FD controller with termination
STMicroelectronics	TS922	Rail-to-rail op-amp for active termination circuits

7. Selection Guidelines

Key considerations: 1. Impedance match: Align with transmission line characteristics. 2. Frequency compatibility: Ensure specifications exceed system requirements. 3. Environmental factors: Temperature range, vibration resistance. 4. Package size: Prioritize SMT for high-density PCBs.
Case Study: For aerospace applications, select terminators with 2% impedance tolerance and -55 C to +125 C operating range.

8. Industry Trends

Development of terahertz-range terminators for 6G networks.
Integration with AI-driven impedance tuning in active terminators.
Adoption of nanomaterial-based substrates for improved thermal management.
Growth in automotive Ethernet terminators due to vehicle electrification.