Vishay General Semiconductor - Diodes Division S1FLJ-GS18

Overview

S1FLJ-GS18 from Vishay Semiconductors is a high-voltage standard recovery surface-mount rectifier diode in the eSMP® Series, rated for 600 V repetitive peak reverse voltage (V_RRM), 1.5 A average forward current at 75 °C case temperature, and 22 A non-repetitive surge current. It features glass passivation, low-profile SMF (DO-219AB) packaging, and is optimized for automated placement in power supply input stages.

For engineers reviewing the S1FLJ-GS18 datasheet, S1FLJ-GS18 pinout, S1FLJ-GS18 application, or S1FLJ-GS18 equivalent, key selection criteria include its 600 V blocking capability, 1.1 V typical forward voltage at 1 A, 1800 ns reverse recovery time, 4 pF junction capacitance, and compatibility with wave/reef soldering processes under IPC-J-STD-020 standards.

Technical Context

The S1FLJ-GS18 operates as a single-diode, unidirectional, standard recovery rectifier with cathode band marking and polarity-sensitive mounting. Its thermal resistance junction-to-ambient is 180 K/W when mounted on a 3 mm × 3 mm Cu pad (≥40 μm thick), limiting continuous operation to ≤75 °C case temperature for full 1.5 A rating.

Electrical behavior is defined by fixed parameters across the S1FLx family: 10 μA max reverse leakage at 25 °C and 50 μA at 125 °C, consistent 1.1 V forward voltage at 1 A, and stable 4 pF junction capacitance at 4 V / 1 MHz - all confirmed for the S1FLJ-GS18 variant specifically.

Key Specifications

Pinout & Package

Package: SMF (DO-219AB), low-profile surface-mount case with cathode band marking; dimensions 3.5 mm × 1.9 mm × 1.08 mm (L × W × H); weight ≈15 mg; compatible with 8 mm tape (GS18: 10K/reel, MOQ = 50K).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage standard recovery rectifier applications.

Compared with STTH1L06S and MUR160, the S1FLJ-GS18 delivers optimal balance of compact SMF packaging, industry-standard 1800 ns recovery, and proven reliability in automated SMT production - making it preferred for new high-density AC-DC designs where thermal management and assembly yield are critical.

Availability

S1FLJ-GS18 is available at Aetrix Electronics and suitable for AC-DC power supplies, industrial motor drive front-ends, and LED driver bulk rectification requiring stable component supply, consistent parametric performance, and full traceability from wafer to shipment.

Supply support for S1FLJ-GS18 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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with emphasis on reliability, precision, and power efficiency.

The eSMP® Series, including S1FLJ-GS18, was engineered for high-voltage surface-mount rectification in space-constrained industrial and consumer power systems where automated assembly and thermal performance are essential.

FAQ

What is the maximum ambient temperature for continuous operation of the S1FLJ-GS18 at 1.5 A?

The S1FLJ-GS18 is rated for 1.5 A average forward current only at T_L = 75 °C (lead temperature), not ambient. With R_thJA = 180 K/W and 1.5 A × 1.1 V = 1.65 W dissipation, ambient must be ≤55 °C on a 3 mm × 3 mm Cu pad to avoid exceeding 150 °C junction limit. Derating is required above that ambient.

Is the S1FLJ-GS18 suitable for high-frequency switching applications like PFC or LLC resonant converters?

No. The S1FLJ-GS18 has a 1800 ns reverse recovery time, which causes excessive switching loss and EMI in topologies operating above 20 kHz. It is intended exclusively for line-frequency (50/60 Hz) and low-frequency (<1 kHz) rectification. For PFC or LLC, fast recovery or ultrafast diodes with t_rr < 100 ns are required.

Does the S1FLJ-GS18 meet RoHS and REACH compliance requirements?

Yes. Per Vishay documentation (www.vishay.com/doc?99912), the S1FLJ-GS18 is categorized as "RoHS-compliant" and "REACH-compliant", with no SVHC substances above threshold. Material declarations and test reports are available upon request through Aetrix Electronics' compliance portal.

What is the recommended PCB footprint for the S1FLJ-GS18 in the SMF (DO-219AB) package?

Vishay specifies a footprint with 1.3 mm × 1.3 mm solder pads, 2.9 mm center-to-center spacing, and 1.4 mm pad width - detailed in document S8-V-3915.01-001. Thermal relief to internal ground planes is discouraged; solid copper connections to ≥9 mm² thermal pads are required to achieve rated I_F(AV).

Can the S1FLJ-GS18 replace the S1FLK-GS18 in an existing design?

No. While both share the same package and thermal specs, the S1FLK-GS18 is rated for 800 V V_RRM, whereas the S1FLJ-GS18 is rated for 600 V. Substituting S1FLJ-GS18 into a design relying on 800 V blocking margin risks catastrophic failure under transient overvoltage conditions. Voltage ratings are not interchangeable.