component
TCZM30B
Public Made by Adomby adom
Tak Cheong Zener Diodes, LL-34. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownTCZM30B
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, primaryclaude-sonnet-5-5(text), consensusclaude-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).