onsemi SL24T3

Overview

SL24T3 from onsemi is a unidirectional transient voltage suppression (TVS) diode in SOT-23 package, designed for high-speed I/O line protection with 24 V working peak reverse voltage, <5 pF junction capacitance, 300 W peak pulse power (8 × 20 µs), and IEC 61000-4-2 Level 4 ESD compliance. It integrates a series-compensating diode to achieve low capacitance and is used in USB 2.0, HDMI, and Ethernet PHY interfaces.

For engineers reviewing the SL24T3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage at 5 A (≤55 V), breakdown voltage range (26.7–29 V), reverse leakage ≤1.0 µA at VRWM, thermal resistance (R_JA = 556 °C/W on FR-5), and Pb-free SOT-23 (Case 318, Style 26) packaging for automated assembly.

Technical Context

The SL24T3 implements a series-connected TVS + compensating diode architecture to reduce effective junction capacitance below 5 pF-critical for preserving signal integrity on >100 Mbps data lines. Its unidirectional configuration requires external inverse-parallel pairing for bidirectional protection.

It operates within -55 °C to +150 °C junction temperature range, supports 260 °C/10 s soldering, and delivers 55 V clamping voltage at 5 A surge current. The device is rated for 300 W peak power per IEC 61000-4-5 lightning surge (12 A) and meets IEC 61000-4-4 EFT (40 A).

Key Specifications

Pinout & Package

SOT-23 (TO-236) package with void-free thermosetting plastic case, UL 94 V-0 flammability rating, and corrosion-resistant solderable finish. Designed for optimal automated board assembly and available in 13-inch tape-and-reel (10,000 units).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TVS diode applications.

Compared with SMAJ24A and TPD2E001DRYR, the SL24T3 uniquely balances 24 V operating voltage, sub-5 pF capacitance, and 300 W surge capability in a compact SOT-23-making it optimal for space-constrained, high-speed industrial interfaces requiring both ESD and lightning protection.

Availability

SL24T3 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI 1.4 TMDS channel safeguarding, and industrial RS-485 transceiver hardening requiring stable component supply across production lifecycles.

Supply support for SL24T3 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.

The SL24T3 belongs to the SL05T1 Series of low-capacitance TVS diodes engineered specifically for high-speed data line protection in communication systems, computers, and peripherals-where preserving signal fidelity under ESD stress is critical.

FAQ

What is the maximum clamping voltage of the SL24T3 at 5 A surge current?

The SL24T3 has a maximum clamping voltage (VC) of 55 V at 5 A peak pulse current (8 × 20 µs waveform). This value is specified in the Electrical Characteristics table of the official datasheet and ensures downstream components like USB transceivers or HDMI receivers remain within their absolute maximum voltage ratings during transient events. The SL24T3 achieves this while maintaining low capacitance and fast response time.

Can the SL24T3 be used for bidirectional line protection?

No-the SL24T3 is a unidirectional TVS diode. For bidirectional protection, two SL24T3 devices must be connected in inverse-parallel (anode-to-anode or cathode-to-cathode), as documented in Figure 6 of the datasheet. This configuration enables clamping of both positive and negative transients while retaining the low-capacitance advantage. Using a single SL24T3 alone only protects against positive-going surges relative to ground.

What does the "T3" suffix indicate in SL24T3?

The "T3" suffix in SL24T3 denotes the tape-and-reel packaging option: 13-inch reel containing 10,000 units. In contrast, "T1" indicates a 7-inch reel with 3,000 units. This designation is defined in the Ordering Information section of the SL05T1 Series datasheet and applies uniformly across the family (SL05T3, SL15T3, SL24T3). The "SL24" portion specifies the 24 V VRWM variant.

Is the SL24T3 RoHS-compliant and lead-free?

Yes-the SL24T3 is offered in a Pb-free SOT-23 package compliant with RoHS Directive 2011/65/EU. The datasheet explicitly states "Pb-Free Packages are Available" and confirms corrosion-resistant, easily solderable finish. It meets JEDEC J-STD-020 MSL1 classification, allowing indefinite storage before reflow. The SL24T3G variant (not SL24T3) is the fully green-marked version, but SL24T3 itself is also lead-free per onsemi's packaging standards.

How does the series-compensating diode in the SL24T3 reduce capacitance?

The SL24T3 integrates a TVS diode in series with a compensating diode, exploiting the physics of capacitors in series: 1/C_T = 1/C₁ + 1/C₂. This topology reduces total junction capacitance to 3.5 pF (typ.)-well below conventional TVS diodes (~15–30 pF). As confirmed in Figure 5 and Applications Background, the compensating diode remains forward-biased during normal operation, contributing negligible capacitance, while the TVS handles surge conduction when reversed.