Diodes Incorporated BAT54SQ-7-F

Overview

BAT54SQ-7-F from Diodes Incorporated is a surface-mount Schottky barrier diode in SOT23 package, rated for 30 V peak reverse voltage, 200 mA average forward current, and 0.8 V max forward voltage at 100 mA. It features a PN junction guard ring for transient and ESD protection, and is RoHS-compliant, halogen-free, and qualified to AEC-Q standards for automotive-grade reliability.

For engineers reviewing the BAT54SQ-7-F datasheet, BAT54SQ-7-F pinout, BAT54SQ-7-F application, or BAT54SQ-7-F equivalent, key selection criteria include low forward voltage drop, fast reverse recovery time (5.0 ns), total capacitance (10 pF at 1 V), thermal resistance (500 °C/W), and SOT23 mechanical compatibility in space-constrained power management and signal routing designs.

Technical Context

This Schottky diode operates with a metal–semiconductor junction enabling low turn-on voltage and minimal forward conduction loss. Its guard ring structure suppresses edge breakdown, improving robustness against ESD transients and repetitive voltage surges up to 30 V.

Designed for high-speed switching, it achieves 5.0 ns reverse recovery time under 10 mA forward/1 mA reverse transition conditions with 100 Ω load. Thermal performance is defined by 500 °C/W junction-to-ambient resistance on FR-4 board with recommended pad layout.

Key Specifications

Pinout & Package

Package: SOT23 (Standard) - 3-terminal surface-mount plastic package, 2.9 mm × 1.3 mm footprint, 1.0 mm height, JEDEC-compliant outline with matte tin-plated Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SBAT54DW-7-F and BAT54C-7-F, BAT54SQ-7-F offers single-diode simplicity, smallest PCB area, and optimized thermal path via exposed cathode tab-making it preferred for discrete clamping in compact consumer and industrial PCBs where layout density and thermal margin are critical.

Availability

BAT54SQ-7-F is available at Aetrix Electronics and suitable for USB interface protection, low-voltage rail clamping, automotive CAN bus transient suppression, and RF signal path isolation requiring stable component supply across production lifecycles.

Supply support for BAT54SQ-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The BAT54 family belongs to Diodes' high-reliability Schottky diode product line, engineered specifically for ESD-hardened signal integrity and low-loss power routing in automotive, industrial, and portable electronics.

FAQ

What is the marking code for BAT54SQ-7-F on the SOT23 package?

The top-side marking for BAT54SQ-7-F is "KL4" followed by a two-character date code (e.g., "KL4KD" for December 2023), per Diodes' DS11005 Rev. 34. "KL4" uniquely identifies the BAT54S variant within the BAT54 series, distinguishing it from BAT54 (KL1), BAT54A (KL2), and BAT54C (KL3).

Does BAT54SQ-7-F have an automotive-grade qualification?

Yes-BAT54SQ-7-F is the automotive-compliant version of the BAT54S, qualified to AEC-Q200 standards for passive components. It meets stress testing requirements including temperature cycling, humidity bias, and mechanical shock, and operates across -65°C to +150°C junction temperature range.

How does the PN junction guard ring improve reliability?

The integrated PN junction guard ring prevents premature edge breakdown under high electric field stress, increasing surge withstand capability and ESD immunity. In practice, this allows BAT54SQ-7-F to sustain 8 kV HBM ESD events without parameter shift, eliminating need for additional TVS devices in many I/O protection schemes.

Can BAT54SQ-7-F replace BAT54-7-F in existing designs?

No-BAT54SQ-7-F is not a direct replacement for BAT54-7-F. While both share SOT23 packaging and basic electrical ratings, BAT54SQ-7-F is automotive-qualified (AEC-Q200), has tighter process controls, and carries different traceability and lot documentation. Use only where automotive reliability and qualification are explicitly required.