component

ZTX551

Public Made by Adom

by adom

Diodes Incorporated Bipolar (BJT), TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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ZTX551

Diodes Incorporated · Bipolar (BJT) · TO-92

ZTX551 from Diodes Incorporated, in a TO-92. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 C passive Collector; PNP collector with VCEO of -65V (ZTX551), continuous IC of -1A and peak pulse ICM of -2A.
2 B passive Base; the emitter-base voltage VEBO is limited to -5V.
3 E passive Emitter; the device symbol shows the emitter arrow pointing into the emitter (PNP).

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package TO-92
Category Transistors/Thyristors
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Collector-Base Breakdown Voltage (ZTX551) BVCBO -80 V IC = -100µA 3
Collector-Emitter Breakdown Voltage (ZTX551) BVCEO -65 V IC = -10mA 3
Emitter-Base Breakdown Voltage BVEBO -5 V IE = -100µA 3
Collector Cut-off Current (ZTX551) ICBO -0.1 µA VCB = -65V 3
Emitter Cut-off Current IEBO -0.1 µA VEB = -4V 3
Collector-Emitter Saturation Voltage (ZTX551) VCE(sat) -350 mV IC = -150mA, IB = -15mA 3
Base-Emitter Saturation Voltage VBE(sat) -1.1 V IC = -150mA, IB = -15mA 3
DC Current Gain (ZTX551) hFE 50 150 IC = -150mA, VCE = -10V 3
DC Current Gain (ZTX551) hFE 10 IC = -1A, VCE = -10V 3
Collector-Base Voltage (ZTX551) VCBO -80 V 2
Collector-Emitter Voltage (ZTX551) VCEO -65 V 2
Emitter-Base Voltage VEBO -5 V 2
Continuous Collector Current IC -1 A 2
Peak Pulse Current ICM -2 A 2
Power Dissipation PD 1.5 W Note 5: through-hole at seating plane, 2.5mm lead length, collector lead on 25mm x 25mm 1oz Cu, single-sided FR4, still air 2
Power Dissipation PD 1 W Note 6: minimum recommended pad layout, 12mm lead length, still air 2
Thermal Resistance Junction to Ambient RJA 116 C/W Note 5: as PD note 5 2
Thermal Resistance Junction to Ambient RJA 175 C/W Note 6: as PD note 6 2
Thermal Resistance Junction to Lead RJL 63.75 C/W Note 7: junction to solder point at seating plane, 2.5mm from package bottom along collector lead 2
Operating and Storage Temperature Range TJ, TSTG -55 200 C 2
Electrostatic Discharge - Human Body Model ESD HBM 4000 V JEDEC Class 3A, JESD22-A114 2
Electrostatic Discharge - Machine Model ESD MM 400 V JEDEC Class C, JESD22-A115 2

CAD (KiCad official)

  • Symbol: ZTX551
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92 (KiCad packages3D, STEP)
  • 3D model files: ztx551-etched.step / ztx551-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ztx551.step / ztx551.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Diodes Incorporated datasheet (6 pp, sha256 76f60ee5e422f8a2, retrieved 2026-10-15, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF