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TCZM30B

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Tak Cheong Zener Diodes, LL-34. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TCZM30B

Tak Cheong · Zener Diodes · LL-34

TCZM30B from Tak Cheong, in a LL-34. 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 Cathode passive Cathode terminal, marked by the color band (blue) denoting negative polarity; for the TCZM30B the zener voltage is 30 V nominal (29.40 to 30.60 V) at IZT = 2 mA.
2 Anode passive Anode terminal, the end opposite the cathode color band, of the two-terminal LL-34 (Mini-MELF) zener diode; forward voltage is 1 V maximum at IF = 100 mA.

Key specifications

Parameter Value
Manufacturer Tak Cheong
Package LL-34
Category Diodes
Pins 2

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
Zener Voltage VZ 29.4 30 30.6 V @ IZT = 2 mA, TA = 25°C 2
Zener Voltage Tolerance -2 2 % TCZMxxxB 1
Test Current IZT 2 mA TA = 25°C 2
Zener Impedance ZZT 75 Ω @ IZT = 2 mA 2
Knee Test Current IZK 0.5 mA TA = 25°C 2
Zener Knee Impedance ZZK 282 Ω @ IZK = 0.5 mA 2
Reverse Current IR 0.045 A @ VR = 21.0 V 2
Reverse Voltage VR 21 V test voltage for IR 2
Forward Voltage VF 1 V IF = 100 mA, all types 2
Power Dissipation PD 500 mW TA = 25°C 1
Storage Temperature Range -65 175 °C 1
Operating Junction Temperature 175 °C 1

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts tin  Matte Tin (Sn) Terminal Finish  Color band Indicates Negative Polarity 1

CAD (KiCad official)

  • Symbol: TCZM30B
  • Footprint: Diode_SMD:D_MiniMELF
  • 3D model: LL-34 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Tak Cheong datasheet (6 pp, sha256 259e51f960aecdb7, retrieved 2026-10-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-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