Diodes Incorporated FCX1051ATA

Overview

FCX1051ATA from Diodes Incorporated is a 40V, 3A NPN medium-power transistor in SOT89 package, featuring V_CE(sat) ≤ 25 mV at 200 mA, R_sat = 57 mΩ, and 2 W power dissipation on 40 mm × 40 mm PCB. It serves as a high-current switch in motor drive, strobe flash, and MOSFET/IGBT gate-driving circuits.

For engineers reviewing the FCX1051ATA datasheet, FCX1051ATA pinout, FCX1051ATA application, or FCX1051ATA equivalent, key selection criteria include verified V_CE(sat) performance at ≥3 A, thermal derating behavior on defined copper areas, complementary pairing with FCX1151A, and AEC-Q101 readiness for automotive gate-drive use cases.

Technical Context

This NPN bipolar junction transistor operates with guaranteed BV_CEO ≥ 40 V and supports continuous collector current up to 3 A under specified PCB thermal conditions. Its low saturation voltage (17–250 mV across 0.2–5 A) and high DC current gain (h_FE = 440 @ 10 mA, 130 @ 5 A) enable efficient switching in medium-power linear and saturated-mode applications.

The device uses a planar epitaxial die structure with matte tin-plated leads and is qualified to J-STD-020 moisture sensitivity Level 1. Thermal resistance θ_JA is 125 °C/W (15 mm × 15 mm PCB) and 62.5 °C/W (40 mm × 40 mm PCB), directly tied to its dual power dissipation ratings of 1 W and 2 W.

Key Specifications

Pinout & Package

SOT89 surface-mount package with molded green plastic case (UL 94V-0), 0.05 g weight, and matte tin-plated leads solderable per MIL-STD-202 Method 208. Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base - confirmed by top-view marking "051" and symbol diagram in DS33077 Rev. 3-2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-power transistor applications.

Compared with ZXTN2012ZTA and MJD122T4G, FCX1051ATA uniquely balances 40 V/3 A rating, ultra-low 17 mV V_CE(sat) at low current, and SOT89 thermal efficiency-making it optimal for compact, thermally constrained gate-drive and strobe circuits where both speed and conduction loss matter.

Availability

FCX1051ATA is available at Aetrix Electronics and suitable for motor drive, strobe flash, and MOSFET/IGBT gate-driving applications requiring stable component supply, automotive-grade traceability, and RoHS-compliant packaging.

Supply support for FCX1051ATA 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 the Americas.

The FCX1051ATA belongs to Diodes' FCX series of medium-power bipolar transistors, engineered specifically for high-reliability switching in automotive, industrial, and consumer power-control systems where low saturation voltage and thermal robustness are critical.

FAQ

What is the maximum continuous collector current for FCX1051ATA under standard PCB conditions?

The FCX1051ATA supports 3 A continuous collector current when mounted on a 40 mm × 40 mm × 0.6 mm FR4 PCB with single-sided 1 oz copper. On smaller 15 mm × 15 mm boards, the rating drops to 1 A due to higher thermal resistance (125 °C/W vs. 62.5 °C/W).

Does FCX1051ATA meet automotive qualification standards?

FCX1051ATA is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101 out-of-box, Diodes states it is suitable for automotive applications requiring specific change control-and offers AEC-Q101 qualification upon request with defined test plans and lot traceability.

How does the SOT89 package contribute to thermal performance?

The SOT89 package features an exposed collector tab that serves as the primary thermal path. When soldered to a large copper area (≥40 mm²), it achieves θ_JA = 62.5 °C/W, enabling 2 W power dissipation without a heatsink-critical for space-constrained gate-drive and converter designs.

What is the significance of the "051" top-marking on FCX1051ATA?

The "051" marking is the product type code per Diodes' internal identification system and corresponds exclusively to the FCX1051A family. It appears adjacent to the emitter pin in top-view orientation and is used for visual verification during assembly and inspection-distinct from date or lot codes which appear elsewhere on the package.