# ZMM5262B

**JSMSEMI** · Zener Diodes · MiniMELF

ZMM5262B from JSMSEMI, in a MiniMELF. 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 | K | passive | Cathode, marked by the color band on the glass MINI-MELF case; for ZMM5262B the nominal zener voltage is 51 V at IZT = 2.5 mA. |
| 2 | A | passive | Anode terminal of the zener diode; the datasheet gives a maximum DC zener current of 8.9 mA and forward voltage of 1.1 V at IF = 200 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | JSMSEMI |
| Package | MiniMELF |
| 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 tolerance (B suffix) | VZ | -5 |  | 5 | % | Standard zener voltage tolerance with B suffix | 1 |
| Nominal zener voltage | VZ |  | 51 |  | V | @ IZT = 2.5 mA | 2 |
| Zener test current | IZT |  | 2.5 |  | mA |  | 2 |
| Maximum zener impedance | ZZT |  |  | 125 | Ω | @ IZT | 2 |
| Maximum zener impedance (knee) | ZZK |  |  | 1100 | Ω | @ IZK | 2 |
| Maximum reverse leakage current | IR |  |  | 0.1 | µA | @ VR = 39 V | 2 |
| Maximum DC zener current | IZM |  |  | 8.9 | mA |  | 2 |
| Forward voltage | VF |  |  | 1.1 | V | IF=200mA | 1 |
| Power dissipation | Ptot |  |  | 500 | mW | Tamb=75°C (Note 1) | 1 |
| Junction temperature | TJ |  |  | 175 | °C |  | 1 |
| Storage temperature range | TSTG | -55 |  | 175 | °C |  | 1 |
| Thermal resistance junction to ambient | RθJA |  |  | 300 | K/W | Note 1: electrodes kept at ambient temperature | 1 |
| Typical temperature coefficient of zener voltage | αVZ |  | 0.096 |  | %/°C |  | 2 |

## CAD (KiCad official)

- Symbol: `ZMM5262B`
- Footprint: `Diode_SMD:D_MiniMELF`
- 3D model: MiniMELF (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [JSMSEMI datasheet](docs/zmm5262b-datasheet.pdf) (3 pp, sha256 `b74ebcbe7485926a`, 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](docs/zmm5262b-datasheet.pdf)