onsemi FSB6726

Overview

FSB6726 from Fairchild Semiconductor is a PNP general-purpose amplifier in SuperSOT™-3 package, rated for 1.0 A continuous collector current, 30 V V_CEO, and 500 mW total dissipation at T_A = 25°C. It delivers V_CE(sat) ≤ 500 mV at I_C = 1 A / I_B = 100 mA and h_FE ≥ 60 at I_C = 100 mA, used in medium-power switching and linear amplification stages of industrial power supplies and motor control interfaces.

For engineers reviewing the FSB6726 datasheet, pinout, applications, or equivalent options, key selection considerations include its PNP polarity, SuperSOT™-3 thermal resistance (R_θJA = 250°C/W), guaranteed V_BE(on) ≤ 1.2 V at I_C = 1 A, and specified BVCBO = 40 V - all critical for discrete transistor replacement and thermal-limited board-level designs.

Technical Context

The FSB6726 operates as a silicon PNP bipolar junction transistor fabricated in Process 77, optimized for medium-power linear amplification and saturated switching. Its DC current gain h_FE ranges from 50 to 250 across I_C = 100 mA–1 A, with V_CE(sat) tightly specified at 500 mV max under high-current drive conditions.

Small-signal parameters include h_fe = 25 at 50 mA/10 V/20 MHz and C_cb = 30 pF at 10 V/1 MHz, supporting stable operation in audio-frequency amplifiers and low-MHz switching nodes. The device's BVEBO = 5 V and IEBO ≤ 100 nA confirm robust emitter-base reverse blocking capability.

Key Specifications

Pinout & Package

FSB6726 is housed in the SuperSOT™-3 surface-mount package (3-pin, single-row, gull-wing leads), with pin 1 = Emitter, pin 2 = Base, pin 3 = Collector - confirmed by Fairchild's official package drawing for fsb6726lwp Pr77 RevA.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP transistor applications.

Compared with MJD2955G and ZTX753, the FSB6726 offers optimal balance of 1 A current capability, SuperSOT™-3 footprint, and 30 V V_CEO for space-constrained industrial controls - making it preferred where board area and thermal mass are limited but TO-220 is impractical.

Availability

FSB6726 is available at Aetrix Electronics and suitable for industrial power supply control, DC motor direction switching, and LED driver circuits requiring stable component supply and long-term manufacturability.

Supply support for FSB6726 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete devices before its acquisition by ON Semiconductor in 2016.

The FSB6726 belongs to Fairchild's general-purpose PNP BJT family designed for medium-power switching and amplification in industrial, automotive, and consumer power systems.

FAQ

What is the maximum continuous collector current rating for the FSB6726?

The FSB6726 has a maximum continuous collector current rating of 1.0 A at T_A = 25°C, as specified in its Absolute Maximum Ratings table. This rating assumes proper PCB copper area and ambient conditions; derating applies above 25°C per the R_θJA = 250°C/W thermal resistance. The FSB6726 must not exceed this limit in sustained operation to avoid junction overheating.

Does the FSB6726 have a documented V_CE(sat) specification at high current?

Yes, the FSB6726 specifies V_CE(sat) ≤ 500 mV at I_C = 1 A and I_B = 100 mA, per its ON CHARACTERISTICS table. This value is measured under pulsed conditions (≤300 µs, ≤2% duty cycle) but reflects real-world saturation behavior in switching applications. The FSB6726 achieves this low drop while maintaining reliable turn-off due to its defined h_FE range.

What package type does the FSB6726 use, and is it RoHS compliant?

The FSB6726 uses the SuperSOT™-3 surface-mount package, a 3-pin gull-wing leaded outline measuring 2.9 mm × 1.3 mm. While the original Fairchild datasheet (RevA) does not explicitly declare RoHS status, ON Semiconductor's post-acquisition documentation confirms legacy Fairchild discrete devices-including FSB6726-are manufactured to RoHS-compliant standards. The FSB6726 meets lead-free soldering requirements per J-STD-020.

Can the FSB6726 replace the FSB660 in existing designs?

The FSB6726 is not a direct replacement for the FSB660: although both are PNP transistors in SuperSOT™-3, the FSB660 has V_CEO = 40 V and h_FE = 30–150, whereas the FSB6726 specifies V_CEO = 30 V and h_FE = 50–250. Substituting FSB6726 into an FSB660 design may compromise voltage margin. Verify V_CEO headroom and bias network compatibility before using FSB6726 as an alternative.

What is the thermal resistance (R_θJA) of the FSB6726, and how does it affect layout?

The FSB6726 has a junction-to-ambient thermal resistance of 250°C/W under standard JEDEC test conditions (single-layer 1 in² copper pad). This high R_θJA means PCB copper area directly impacts safe operating power: doubling copper area reduces R_θJA by ~20–30%. For reliable 500 mW operation, the FSB6726 requires at least 0.5 in² of 2-oz copper connected to the collector pad. Layout decisions for the FSB6726 must prioritize thermal relief and copper fill to prevent thermal runaway.