Texas Instruments SN65220YZBT

Overview

SN65220YZBT from Texas Instruments is a dual-channel unidirectional transient voltage suppressor (TVS) designed for ESD protection of USB full-speed and low-speed data lines (D+ and D−). It features 6.5-V minimum breakdown voltage, 35-pF typical input capacitance, ≤1-µA leakage at 6 V, −40°C to +85°C operating range, and DSBGA-4 (YZB) package with 0.925 mm × 0.925 mm body size - deployed in USB host, hub, and peripheral ports.

For engineers reviewing the SN65220YZBT datasheet, SN65220YZBT pinout, SN65220YZBT application, or SN65220YZBT equivalent, this page delivers verified electrical specs, validated pin functions, confirmed USB port protection use cases, and real-world layout guidance for ESD robustness in submicron 3-V/5-V systems.

Technical Context

The SN65220YZBT integrates two independent unidirectional TVS diodes optimized for USB signal integrity: each channel clamps transients above 6.5 V while maintaining ≤35 pF capacitance to avoid signal distortion at 12 Mbps full-speed rates. Its structure uses Zener-triggered bipolar transistor action for positive transients and forward-biased diode conduction for negative transients.

It operates without external power supply, relying solely on transient voltage thresholds for activation. The device enters low-impedance conduction mode only when input voltage exceeds breakdown, shunting surge current directly to local GND - requiring solid ground-plane routing and minimal trace inductance per TI layout guidelines.

Key Specifications

Pinout & Package

SN65220YZBT uses a 4-ball DSBGA (YZB) package with 0.925 mm × 0.925 mm body size and 0.4-mm ball pitch. Ground connections are assigned to both A2 and B2 balls for low-inductance return paths.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Compared with TPD2E001DRSR and SP1001-01WTG, SN65220YZBT uniquely balances dual-channel integration, 6.5-V clamping headroom for 5-V USB, and 35-pF capacitance suitable for full-speed operation - making it optimal for cost-sensitive, space-constrained USB endpoints where 12-Mbps performance and ±15-kV ESD immunity are jointly required.

Availability

SN65220YZBT is available at Aetrix Electronics and suitable for USB full-speed host ports, USB peripheral interfaces, and industrial USB device connections requiring stable component supply and guaranteed long-term sourcing.

Supply support for SN65220YZBT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in interface protection and USB system solutions.

The SNx52x0 family - including SN65220YZBT - was engineered specifically for USB port-level ESD hardening in cost-sensitive consumer and industrial endpoints, emphasizing compact packaging, system-level compliance, and seamless integration with standard USB PHY layouts.

FAQ

What is the maximum data rate supported by SN65220YZBT?

SN65220YZBT supports up to 12 Mbps, matching USB full-speed specification. Its 35-pF typical input capacitance limits usability to full-speed and low-speed USB (1.5 Mbps), and it is explicitly unsuitable for high-speed USB 2.0 (480 Mbps) due to signal integrity degradation. TI's datasheet confirms this limitation in Section 3 and Figure 10-1.

Does SN65220YZBT require an external power supply?

No, SN65220YZBT does not require an external power supply. As a passive TVS device composed of integrated p-n junction structures, it activates solely in response to transient overvoltage events - conducting only when input voltage exceeds its 6.5-V breakdown threshold. This is confirmed in Section 11 of the official TI datasheet.

How should SN65220YZBT be laid out on the PCB for optimal ESD performance?

For optimal ESD performance, SN65220YZBT must be placed within 2 mm of the USB connector, with D+ and D− traces routed directly to A1 and B1 pins. Both A2 and B2 ground balls require low-inductance connections to a solid ground plane using ≥2 vias each. Avoid daisy-chained ground traces - TI's Layout Guidelines (Section 12.1) mandate direct ground-plane attachment to prevent L(di/dt) voltage spikes during ESD events.

Is SN65220YZBT compatible with 5-V USB transceivers?

Yes, SN65220YZBT is explicitly designed for 3-V and 5-V USB circuits. Its 6.5-V minimum breakdown voltage provides safe margin above the 5.5-V absolute maximum rating of standard USB transceivers, preventing premature clamping during normal operation while ensuring robust protection against ESD transients. This is stated in Section 9.3 and Table 7-5 of the TI datasheet.

What is the meaning of "YZB" in SN65220YZBT?

"YZB" denotes the DSBGA-4 (Die Size Ball Grid Array, 4-ball) package type for SN65220YZBT - a chip-scale package measuring 0.925 mm × 0.925 mm with 0.4-mm ball pitch. This identifier is defined in TI's Mechanical, Packaging, and Orderable Information section and distinguishes it from SOT-23 (DBV) and PDIP (P) variants of the same SN65220 device family.