1. General Information/Overview

️· Product Type: USB Series Varistors (also referred to as Multilayer Varistors)
️· Function: These are surge protection devices used to protect sensitive electronics from voltage transients and electrostatic discharge (ESD). They limit voltage spikes.
️· Key Features (Implied): Low capacitance, suitable for high-speed data lines (USB, etc.), ESD protection.

2. Part Number Variations and Specifications

The document details several different part numbers with varying physical dimensions and electrical characteristics. Here's a summary of the key part numbers, broken down by their distinct characteristics:

️· USB0001 / USB0005 / USB0006 (Single): These are single-terminal devices. Dimensions and electrical values are provided in a table.
- Dimensions: Details the physical layout of pads with measurements.
- Electrical Values: These are crucial for circuit design and include:
■ Dimensions (L, W, T, BW, BL, P)
■ Leakage Current (I L)
■ Breakdown Voltage (V B)
■ Transient Energy Rating (E T)
■ Peak Current Rating (I P)
■ Capacitance (Cap) - often "REF" (Reference value) implying it's a characteristic value but not a strict spec
️· USB0002 (Dual): A dual-terminal device with similar electrical and dimensional characteristics.
️· USB0004 (Quad): A quad-terminal device, generally with larger physical dimensions and higher rated values (energy, current, etc.) compared to the single/dual variants.

3. Typical S21 Characteristics

️· S21 Characteristics: A graph is included representing the frequency response of the varistor, often used to see how effectively it attenuates high-frequency signals. (This is a common representation in RF or high-speed data circuit design).

4. Typical Pulse Rating Curve

️· Pulse Rating: A graph showing how the varistor’s performance is affected by different pulse durations.

5. Pad Layout Information & Terminology

The diagrams and tables provide detailed information about the physical layout of the pads (connection points) on the device.

️· Pad labels: L (Length), W (Width), T (Thickness), BW (Body Width), BL (Body Length), P (Pad), D, C, E, A, B.
️· Suffix/Notation: Values are often presented as "±" (plus/minus) or "REF" (reference) indicating tolerance or a characteristic value.
️· Units: Dimensions are given in both millimeters (mm) and inches (in).

6. Physical Dimensions Table

Characteristic	USB0001	USB0002	USB0004	USB0005 / USB0006
A	0.89 (0.035)
B	0.76 (0.030)
C	2.54 (0.100)
D	0.76 (0.030)
E	N/A
L	1.60±0.15 (0.063±0.006)	1.00±0.15 (0.039±0.006)	1.60±0.20 (0.063±0.008)	1.0±0.10 (0.040±0.004)
W	0.80±0.15 (0.032±0.006)	1.37±0.15 (0.054±0.006)	3.20±0.20 (0.126±0.008)	0.50±0.10 (0.020±0.004)
T	0.90 Max (0.035 Max)	0.66 Max (0.026 Max)	1.22 Max (0.048 Max)	0.60 Max (0.024 Max)
BW	N/A	0.36±0.10 (0.014±0.004)	0.41±0.10 (0.016±0.004)	N/A
BL	N/A	0.20±0.10 (0.008±0.004)	0.18+0.25/-0.08 (0.007+.01/-.003)	N/A

Summary & Key Takeaways

️· Variety of Options: The USB Series Varistors provide a selection of different part numbers to suit various application requirements for surge protection.
️· Detailed Specifications: The document provides extensive details on physical dimensions, electrical values (breakdown voltage, leakage current, energy rating, capacitance), and expected frequency response. Circuit designers need to refer to all parameters, not just the "big" values.
️· High-Speed Data Protection: These are explicitly designed for use with high-speed data lines where surge protection must not introduce excessive capacitance or signal degradation.
️· Careful Selection: Circuit designers must carefully select the appropriate part number based on the specific voltage, current, and energy levels expected in their application.
️· Terminology: understanding terms like "REF," "Max," "+/-" is crucial for interpreting the datasheet.