Diodes Incorporated FZT948TA

Overview

FZT948TA from Diodes Incorporated is a 20V PNP medium-power transistor in SOT223 package, rated for -6A continuous collector current and -20A peak pulse current, with low V_CE(sat) down to -360mV at -6A/-250mA drive, and DC current gain (h_FE) of 60–130 at -10A. It serves as a high-current switching or linear amplification device in automotive power control, industrial motor drivers, and DC-DC converter output stages.

For engineers reviewing the FZT948TA datasheet, FZT948TA pinout, FZT948TA application, or FZT948TA equivalent, key selection criteria include its -20V V_CEO, -6A I_C, thermal resistance R_θJA = 42°C/W (on 52mm×52mm 2oz Cu), h_FE hold-up to -20A, and AEC-Q101 qualification readiness for automotive-grade reliability.

Technical Context

The FZT948TA is a silicon PNP bipolar junction transistor optimized for medium-power switching and linear operation. Its design emphasizes high-current capability (-6A continuous, -20A pulsed), stable gain across wide current range (h_FE = 15–200 from -20A to -10mA), and robust thermal performance with R_θJL = 8.84°C/W enabling efficient heat transfer through the collector lead.

It features low saturation voltage (V_CE(sat) ≤ -450mV at -6A) and fast switching (t_on/t_off ≈ 120/126ns), supported by f_T = 80MHz and C_obo = 163pF. The device meets RoHS 3, halogen-free, and antimony-free "Green" requirements, with JEDEC Class 3B HBM ESD rating (4kV).

Key Specifications

Pinout & Package

Package: SOT223 (Type DN), surface-mount, 4-pin configuration with collector tab (pin 1), emitter (pin 2), base (pin 3), and collector (pin 4). Molded plastic body, matte tin-plated leads, UL 94V-0 rated, weight ≈ 0.112g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXTN25050DFH and MJD2955T4G, the FZT948TA delivers optimal balance of SMT compatibility, -6A current, -20V rating, and 42°C/W thermal resistance-making it ideal for compact, high-reliability 12V automotive and industrial power switches where board space and thermal management are constrained.

Availability

FZT948TA is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC motor drivers, and 12V DC-DC converter output stages requiring stable component supply, AEC-Q101-aligned manufacturing, and consistent SOT223 packaging.

Supply support for FZT948TA 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 distribution operations across Asia, Europe, and North America.

The FZT948TA belongs to Diodes' high-reliability power transistor product line, engineered specifically for automotive and industrial applications demanding robust thermal performance, high-current switching, and compliance with stringent environmental standards including AEC-Q101 and RoHS 3.

FAQ

What is the maximum operating temperature for FZT948TA?

The FZT948TA has an operating junction temperature range of -55°C to +150°C. Its absolute maximum storage temperature matches this range. Derating begins at +25°C ambient, with power dissipation dropping linearly at 24mW/°C on 52mm×52mm 2oz Cu PCB-allowing ~2.4W at +70°C ambient before reaching the 3.0W PD limit.

Is FZT948TA qualified to AEC-Q101?

The FZT948TA is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified as a standard AEC-Q101 part, Diodes states it is suitable for automotive applications requiring specific change control and can be qualified upon request-making it appropriate for Tier-1 suppliers developing AEC-compliant modules.

Can FZT948TA replace a MOSFET in high-side switching?

FZT948TA functions as a PNP BJT-not a MOSFET-and requires continuous base current for saturation, unlike voltage-driven MOSFETs. It is viable for high-side switching where base drive circuitry is available and where its -360mV V_CE(sat) at -6A offers lower conduction loss than many small-signal P-channel MOSFETs in the same package, but it lacks inherent gate protection and has slower switching than most logic-level MOSFETs.

What is the recommended PCB layout for thermal performance?

For optimal thermal performance, Diodes specifies mounting on 52mm×52mm 2oz copper on FR4. The SOT223 collector tab (pins 1 and 4) must connect to a large copper pour via multiple thermal vias. Pad dimensions should follow Diodes' suggested layout: 2.30mm × 6.40mm for main pad, with 1.20mm × 3.30mm inner cutouts and 1.60mm × 8.00mm outer outline-ensuring mechanical stability and thermal conduction.