Texas Instruments SN65220DBVRG4

Overview

SN65220DBVRG4 from Texas Instruments is a dual unidirectional transient voltage suppressor (TVS) designed for ESD protection of USB full-speed and low-speed D+ and D− data lines. 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 SOT-23-6 package. It safeguards submicron 3-V/5-V USB transceivers against 15-kV HBM ESD events.

For engineers reviewing the SN65220DBVRG4 datasheet, SN65220DBVRG4 pinout, SN65220DBVRG4 application, or SN65220DBVRG4 equivalent, key selection criteria include standoff voltage margin vs. 5-V USB supply, low-capacitance impact on 12-Mbps signal integrity, ground-pin layout for ESD current shunting, and compatibility with standard SOT-23 PCB footprints.

Technical Context

The SN65220DBVRG4 integrates two independent unidirectional TVS diodes in a single SOT-23-6 package, each protecting one USB differential line (D+, D−) to local ground. Its Zener-based clamping architecture activates at ≥6.5 V, enabling robust suppression of fast-rising ESD transients while remaining non-conductive during normal 0–3.3/5-V USB signaling.

It operates without external power, relying solely on transient overvoltage to trigger conduction. The dual-ground-pin configuration (Pins 2 and 5) minimizes inductance in the surge-current return path, critical for maintaining clamping speed and effectiveness under IEC 61000-4-2 system-level ESD stress.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, 1.45 mm max height, gull-wing leads, RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD2E001DRSR and SP1001-01UTG, the SN65220DBVRG4 delivers higher 6.5-V standoff and 15-kV HBM rating essential for robust 5-V USB full-speed port protection, while its 35-pF capacitance remains acceptable for 12-Mbps signaling-making it the optimal choice where system-level ESD compliance is prioritized over ultra-high-speed data integrity.

Availability

SN65220DBVRG4 is available at Aetrix Electronics and suitable for USB full-speed host ports, industrial USB peripheral interfaces, embedded medical device controllers, and automotive docking station designs requiring stable component supply and long-term manufacturability.

Supply support for SN65220DBVRG4 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 delivering analog and embedded processing solutions, with leadership in interface, power management, and signal chain technologies.

The SN65220DBVRG4 belongs to TI's USB transient suppressor product line, engineered specifically to provide system-level ESD robustness for legacy USB 1.x ports without compromising signal fidelity or requiring redesign of existing 5-V transceiver architectures.

FAQ

What is the primary circuit role of the SN65220DBVRG4 in a USB design?

The SN65220DBVRG4 serves as a dual unidirectional transient voltage suppressor, placed directly on the D+ and D− lines of a USB full-speed or low-speed port to clamp ESD and electrical noise transients to ground. Its function is purely protective-it does not participate in signal transmission or protocol handling. Each channel independently clamps overvoltage events above 6.5 V while remaining high-impedance during normal 0–3.3/5-V signaling, ensuring zero impact on USB data integrity. This role is confirmed in the device's functional block diagram and typical application schematic.

Can the SN65220DBVRG4 be used in high-speed USB 2.0 applications?

No, the SN65220DBVRG4 is not suitable for high-speed USB 2.0 (480 Mbps) applications. Its 35-pF typical input capacitance introduces excessive signal attenuation and jitter at 480 Mbps, degrading eye diagram opening and violating USB 2.0 electrical specifications. The datasheet explicitly states that this capacitance "makes it unsuitable for high-speed USB 2.0 applications." It is qualified only for USB 1.1 full-speed (12 Mbps) and low-speed (1.5 Mbps) operation, where 35 pF remains within acceptable limits for rise/fall time and impedance matching.

How should the two GND pins (Pins 2 and 5) of the SN65220DBVRG4 be routed on the PCB?

Pins 2 and 5 of the SN65220DBVRG4 must each connect via separate, short, wide traces directly to a solid ground plane-never daisy-chained or routed through vias in series. The datasheet mandates this dual-ground topology to minimize total surge-current loop inductance, which directly impacts clamping speed and voltage overshoot during ESD events. Layout guidelines specify using multiple vias per GND pad and avoiding narrow traces; failure to implement both GND connections degrades ESD protection performance and may cause non-compliance with IEC 61000-4-2 testing.

What is the significance of the 6.5-V minimum breakdown voltage for the SN65220DBVRG4?

The 6.5-V minimum breakdown voltage ensures the SN65220DBVRG4 remains fully non-conductive during all valid USB operating conditions-including worst-case 5.5-V VBUS tolerance and transient overshoots-while reliably triggering during ESD events exceeding 6.5 V. This 1-V design margin prevents false clamping that could distort D+/D− differential signaling or load the transceiver output stage. The value is measured at 1 mA per terminal and is guaranteed across temperature, making it a critical parameter for safe integration with 5-V-tolerant USB PHYs.

Is the SN65220DBVRG4 compliant with RoHS and REACH regulations?

Yes, the SN65220DBVRG4 is RoHS-compliant, as confirmed in the TI Packaging Information table where "RoHS" is marked "Yes" for the DBVR variant (identical packaging and process). It uses NiPdAu lead finish and meets EU Directive 2011/65/EU requirements. REACH SVHC status aligns with TI's general compliance policy; no substances of very high concern are intentionally added, and full material declarations are available via TI's Product Compliance page. The G4 suffix denotes tape-and-reel packaging per TI's internal ordering convention and does not affect chemical compliance.