Vishay General Semiconductor - Diodes Division GSOT12-HT3-GS08

Overview

GSOT12-HT3-GS08 from Vishay Semiconductors is a single-line bidirectional asymmetrical (BiAs) ESD protection diode in LLP75-3B package, rated for 12 V reverse standoff voltage (VRWM), ±30 kV IEC 61000-4-2 ESD immunity, and 12 A peak pulse current (IPPM), used to safeguard high-speed data lines such as USB 2.0 or HDMI interfaces against transient overvoltage events.

For engineers reviewing the GSOT12-HT3-GS08 datasheet, GSOT12-HT3-GS08 pinout, GSOT12-HT3-GS08 application, or GSOT12-HT3-GS08 equivalent, key selection criteria include clamping voltage at 12 A (21.2–26 V), low leakage (<1 µA at 12 V), 115–150 pF capacitance at 0 V bias, and compatibility with space-constrained PCB layouts requiring LLP75 footprint.

Technical Context

The GSOT12-HT3-GS08 operates in BiAs-mode: pin 1 is grounded, pin 3 connects to the protected signal line, and pin 2 serves as internal connection node enabling asymmetrical clamping-forward conduction clamps negative transients near ground (VF ≤ 2.2 V at 12 A), while reverse breakdown (VBR = 13.5–15 V) handles positive surges.

This device delivers bidirectional protection without external biasing, achieves MSL level 1 moisture sensitivity, and maintains stable performance across –40 °C to +125 °C junction temperature range, with UL 94 V-0 molding compound and lead-free matte tin (e3) termination.

Key Specifications

Pinout & Package

GSOT12-HT3-GS08 uses the LLP75-3B surface-mount package: 1.6 mm × 1.6 mm body, 0.55 mm height, 0.5 mm pitch, matte tin (e3) terminations, and UL 94 V-0 flame-retardant molding compound.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ESD protection applications.

Compared with SMAJ12A-E3/57T and TPD2E001DRYR, GSOT12-HT3-GS08 uniquely combines 12 V standoff, ±30 kV ESD rating, and 50 pF capacitance at operating bias-enabling robust, high-speed protection in space-limited 12 V interface designs without sacrificing signal fidelity or requiring layout redesign.

Availability

GSOT12-HT3-GS08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI hot-plug detection circuits, and industrial sensor I/O conditioning requiring stable component supply, consistent parametric performance, and full traceability.

Supply support for GSOT12-HT3-GS08 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

Vishay Semiconductors is a global manufacturer of discrete semiconductors and passive components, specializing in high-reliability, application-optimized devices for automotive, industrial, computing, and consumer markets.

The GSOT-HT3 series was developed specifically for high-density, high-speed data line ESD protection, emphasizing low capacitance, asymmetrical clamping, and LLP packaging to meet miniaturization and signal integrity demands in modern connectivity interfaces.

FAQ

What is the maximum operating temperature range for GSOT12-HT3-GS08?

The GSOT12-HT3-GS08 is rated for junction temperatures from –40 °C to +125 °C, making it suitable for deployment in harsh environments such as industrial control cabinets or under-hood automotive modules. This range is validated per the absolute maximum ratings table in Vishay Document Number 85822, Rev. 1.8, and applies to continuous operation under specified electrical conditions. Thermal design must ensure that PCB copper area and airflow maintain junction temperature within this limit during peak transient events.

Does GSOT12-HT3-GS08 require an external bias or control signal to function?

No, GSOT12-HT3-GS08 operates passively and requires no external bias, power, or control signals. Its BiAs-mode protection relies solely on internal diode structures between pins 1, 2, and 3. When pin 1 is connected to ground and pin 3 to the protected line, the device automatically clamps transients in both polarities-forward conduction for negative excursions and reverse breakdown for positive surges-without any active circuitry or configuration.

How does the capacitance of GSOT12-HT3-GS08 vary with applied voltage?

The GSOT12-HT3-GS08 exhibits voltage-dependent capacitance: 115–150 pF at 0 V bias, dropping to 50 pF at 6 V reverse bias. This behavior results from the depletion region widening in the internal PN junction as reverse voltage increases. For USB 2.0 or other 12 V-tolerant data lines operating near common-mode voltage, the effective capacitance remains low-preserving signal integrity and minimizing jitter or attenuation in high-speed applications.

Is GSOT12-HT3-GS08 compatible with lead-free reflow soldering processes?

Yes, GSOT12-HT3-GS08 is fully compatible with lead-free reflow soldering. It carries an MSL level 1 rating per J-STD-020, has no floor life limitation, and is qualified for peak temperatures up to 260 °C for 10 seconds at the terminals. The matte tin (e3) lead finish and UL 94 V-0 molding compound ensure reliable wetting and thermal stability during standard Pb-free reflow profiles used in high-volume SMT assembly.

Can GSOT12-HT3-GS08 be used to protect a 5 V logic line?

GSOT12-HT3-GS08 is not recommended for protecting 5 V logic lines because its 12 V reverse standoff voltage (VRWM) is significantly higher than the 5 V rail-resulting in insufficient margin before conduction begins and potential signal interference. For 5 V applications, lower VRWM devices such as GSOT05-HT3-GS08 (5 V VRWM) or TPD2E001DRYR (5 V VRWM) provide tighter clamping and lower leakage, ensuring reliable operation without false triggering during normal logic transitions.