Diodes Incorporated BCX6825TA

Overview

BCX6825TA from Diodes Incorporated is a 20V NPN silicon planar medium-power transistor in SOT89 package, rated for 1A continuous collector current, with V_CE(sat) < 500 mV at 1 A and h_FE = 50–400 (depending on I_C). It is qualified to AEC-Q101 and used in power MOSFET gate driving and low-loss switching circuits.

For engineers reviewing the BCX6825TA datasheet, BCX6825TA pinout, BCX6825TA application, or BCX6825TA equivalent, key selection criteria include its 20 V V_CEO, 1 W power dissipation, thermal resistance R_θJL = 10.01 °C/W, SOT89 mechanical footprint, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This NPN bipolar junction transistor operates as a medium-power switch with high DC current gain across multiple operating points: h_FE ≥ 50 at I_C = 5 mA/V_CE = 10 V, ≥ 250 at I_C = 500 mA/V_CE = 1 V, and ≥ 400 at I_C = 1 A/V_CE = 1 V. Its f_T = 100 MHz supports fast-switching applications.

Designed for stable operation up to +150 °C junction temperature, it features low R_θJL (10.01 °C/W) via the exposed collector pad and meets J-STD-020 Level 1 moisture sensitivity - enabling standard reflow without baking.

Key Specifications

Pinout & Package

Package: SOT89 - surface-mount plastic package with exposed collector pad for thermal and electrical connection; 3-terminal configuration; 0.052 g mass; UL 94V-0 rated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZTX653 and MJD112, BCX6825TA offers optimal balance of automotive qualification, SOT89 compactness, and 1 A/20 V capability - making it preferred for cost- and space-constrained automotive body electronics where 20 V operation suffices.

Availability

BCX6825TA is available at Aetrix Electronics and suitable for automotive door modules, industrial relay interfaces, DC-DC gate drivers, and LED current switches requiring stable component supply with AEC-Q101 assurance.

Supply support for BCX6825TA 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, serving automotive, industrial, computing, and consumer markets with high-reliability components.

The BCX6825TA belongs to Diodes' general-purpose bipolar transistor product line, engineered for robust medium-power switching in space-constrained, thermally demanding environments - especially where automotive qualification and green compliance are mandatory.

FAQ

Is BCX6825TA pin-compatible with BCX69?

No - BCX6825TA is an NPN device while BCX69 is its complementary PNP counterpart. They share identical SOT89 package dimensions and thermal design, but pin assignments differ: BCX6825TA has Collector-Base-Emitter (C-B-E) order, whereas BCX69 uses Emitter-Base-Collector (E-B-C). Direct substitution is not possible without board redesign.

What is the maximum allowable PCB copper area for optimal thermal performance?

For best thermal performance, Diodes recommends a minimum 15 mm × 15 mm single-sided 1 oz copper pour connected directly to the exposed collector pad. Larger copper areas further reduce R_θJA; however, the datasheet's 125 °C/W rating assumes exactly this layout under still-air conditions.

Does BCX6825TA support PWM switching at 20 kHz?

Yes - with f_T = 100 MHz and V_CE(sat) < 500 mV, BCX6825TA supports clean 20 kHz PWM switching for motor or LED control. Ensure base drive strength (≥100 mA peak) and minimize trace inductance to maintain fast edge integrity and avoid secondary breakdown during transitions.

Can BCX6825TA be used in linear regulator pass-transistor roles?

It is not recommended - while BCX6825TA can operate in linear mode, its SOA (Safe Operating Area) is optimized for switching, not continuous linear dissipation. At 1 A and 5 V drop, power dissipation exceeds 1 W, exceeding its 1 W P_D rating unless actively cooled. Use dedicated pass transistors or LDOs for regulated linear applications.