onsemi 2SD1805F-TL-E

Overview

2SD1805F-TL-E from onsemi is an NPN bipolar junction transistor (BJT) optimized for high-current switching applications, featuring V_CEO = 20 V, I_C = 5 A continuous, V_CE(sat) = 220 mV (typ.) at I_C = 3 A / I_B = 60 mA, and fast switching with t_on = 30 ns. It is used in lamp drivers, relay drivers, and strobe circuits where low saturation voltage and compact DPAK packaging are critical.

For engineers reviewing the 2SD1805F-TL-E datasheet, pinout, applications, or equivalent options, key selection criteria include verified DC current gain (h_FE = 95–560), thermal performance under T_C = 25°C (P_C = 15 W), and Pb-free DPAK/TP-FA package compatibility with automated assembly.

Technical Context

This device operates as a single NPN power switch with base-controlled conduction. Its low V_CE(sat) and high I_C rating support efficient on-state power delivery in pulse-driven loads, while f_T = 120 MHz enables reliable operation in medium-frequency switching up to several MHz.

The 2SD1805F-TL-E uses a DPAK (TP-FA) thermally enhanced surface-mount package with exposed collector tab for direct PCB heat sinking. Absolute maximum ratings include V_CBO = 60 V, T_j = 150°C, and pulse current capability of I_CP = 8 A, confirming suitability for transient-heavy industrial drive stages.

Key Specifications

Pinout & Package

DPAK (TP-FA) package with exposed collector tab (Case 369AH), thermally optimized for surface-mount PCB mounting and direct heatsinking. Pin 1 = Base, Pin 2 = Collector (tab), Pin 3 = Emitter.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD1805T4G and 2SD2142-Y, the 2SD1805F-TL-E delivers optimal balance of low-loss switching, thermal capability, and industry-standard DPAK manufacturability - making it the preferred choice for new 12–20 V, 3–5 A switching designs requiring production scalability and thermal headroom.

Availability

2SD1805F-TL-E is available at Aetrix Electronics and suitable for lamp drivers, relay drivers, strobes, and linear voltage regulators requiring stable component supply, RoHS-compliant packaging, and high-volume tape-and-reel delivery.

Supply support for 2SD1805F-TL-E 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 focused on energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The 2SD1805F-TL-E belongs to onsemi's general-purpose power bipolar transistor family, engineered specifically for high-current, low-saturation switching in cost-sensitive industrial and consumer power interfaces.

FAQ

What is the maximum continuous collector current rating for the 2SD1805F-TL-E?

The 2SD1805F-TL-E is rated for 5 A continuous collector current (I_C) at case temperature T_C = 25°C. This rating assumes proper PCB copper area or heatsinking to maintain the collector tab below 25°C. At higher ambient or case temperatures, derating per Figure 11 in the datasheet applies - e.g., ~3.5 A at T_C = 75°C. The 2SD1805F-TL-E achieves this with its DPAK-exposed collector design, enabling 15 W dissipation when mounted correctly.

Does the 2SD1805F-TL-E have Pb-free construction?

Yes, the 2SD1805F-TL-E is explicitly marked as Pb-free in the onsemi datasheet and ordering information. The "−E" suffix denotes compliance with RoHS Directive 2011/65/EU, and the device uses lead-free matte tin plating on terminals. This makes the 2SD1805F-TL-E suitable for environmentally regulated manufacturing without requiring exemption waivers or special processing.

What is the typical V_CE(sat) of the 2SD1805F-TL-E under standard switching conditions?

The typical collector-emitter saturation voltage (V_CE(sat)) of the 2SD1805F-TL-E is 220 mV at I_C = 3 A and I_B = 60 mA, per the Electrical Characteristics table. This value is confirmed across production lots and represents the on-state voltage drop that directly determines conduction loss - for example, 0.66 W at 3 A. The 2SD1805F-TL-E maintains this low saturation even at elevated junction temperatures, supporting stable performance in thermally demanding lamp and relay driver applications.

Can the 2SD1805F-TL-E replace older 2SD1805 variants in existing designs?

Yes, the 2SD1805F-TL-E is a direct replacement for prior 2SD1805 versions in the same DPAK/TP-FA package, including mechanical and electrical compatibility. The "F" grade indicates h_FE binning of 160–320 at I_C = 500 mA, and the "TL-E" suffix confirms tape-and-reel packaging and Pb-free finish. No PCB or schematic changes are needed when upgrading to the 2SD1805F-TL-E, and its validated switching times and thermal specs ensure identical functional behavior in strobe, regulator, and driver circuits.

What is the gain-bandwidth product (f_T) of the 2SD1805F-TL-E, and how does it affect switching performance?

The gain-bandwidth product (f_T) of the 2SD1805F-TL-E is 120 MHz, measured at V_CE = 10 V and I_C = 50 mA. This parameter reflects the transistor's intrinsic speed limit and correlates strongly with achievable switching edge rates. In practice, the 2SD1805F-TL-E sustains clean turn-on (30 ns) and fall (40 ns) times because f_T supports sufficient current gain at frequencies well above typical PWM or strobe trigger bandwidths - ensuring reliable, jitter-free operation in the 2SD1805F-TL-E's target applications.