Product Overview
Low Saturation Medium Power Silicon Bipolar Switching Device
Condition
Unused new old stock (NOS). Package face is marked across three lines: ZTX, 789, A. Straight through-hole leads are clean and intact.
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Product Overview
Diodes Incorporated ZTX789A is a PNP medium power bipolar transistor housed in an E-Line-3 through-hole package. Originally developed by Zetex, this low-saturation silicon device handles 3 A of continuous collector current and 8 A peak pulse current with a total power dissipation rating of 1 W. With a collector-emitter breakdown rating of 25 V and high transition frequency, it delivers efficient switching performance where standard small-signal TO-92 devices lack adequate current capability.
Key Features
- Transistor polarity: PNP
- Collector-emitter breakdown voltage (VCEO): 25 V
- Continuous collector current (IC): 3 A
- Peak pulse current (ICM): 8 A
- Total power dissipation (Ptot): 1 W
- Transition frequency (fT): 100 MHz
- Package: E-Line-3 through-hole
Applications
- Drop-in replacement for audio amplifier drivers and pre-driver stages requiring low distortion and solid current headroom.
- High-efficiency power switching in low-voltage battery management systems and DC motor drive circuits.
- Custom robotics and microcontroller output stages controlling solenoids, relays, or high-power LEDs.
Frequently Asked Questions
What is the primary advantage of the ZTX789A over standard small-signal PNP transistors?
The ZTX789A delivers up to 3 A continuous current and a 1 W power rating in a compact E-Line footprint, offering significantly lower saturation voltage and higher current handling than typical general-purpose devices.
Are the leads formatted for standard through-hole breadboards and PCBs?
Yes, the straight three-pin leads fit standard through-hole circuit boards and 0.1-inch prototyping spacing.
Can I purchase the exact quantity needed for my project?
Units are offered individually so you can order the precise count required for your build or repair without buying excess stock. More pieces cost less each, and the price-break table on this page shows what each quantity costs. Shipping is $8 flat rate, free once the order passes $28, and orders leave the Idaho warehouse the same or next business day.
High-current switching in a compact footprint is the quiet hero of clean circuit design. Put this where standard small-signal transistors run out of steam and let your board run cool.
