500 mW surface-mount silicon planar Zener diode with a nominal 5.1 V breakdown, in a SOD-123 package. The Zener voltage is 4.8-5.4 V at a 5 mA test current, and the cathode band marks polarity. Used for voltage clamping, simple shunt references, and rail protection. Reverse-biased above Vz it conducts and holds the voltage; forward drop is 0.9 V.

Pinout

Pin	Name	Type	Function
1	K	passive	Cathode of the Zener diode. Marked by the cathode band on the SOD-123 package top. Reverse-breakdown at nominally 5.1 V (4.8–5.4 V) when biased more positive than the anode by Vz; test current Izt = 5 mA, Zzt = 60 Ω, Ir ≤ 2.0 µA @ Vr = 2.0 V.
2	A	passive	Anode of the Zener diode. Forward voltage Vf = 0.9 V @ If = 10 mA; typical Zener operation reverse-biases anode negative with respect to cathode.

Key specifications

Parameter	Value
Type	Zener diode (silicon planar)
Zener voltage (Vz)	5.1 V nominal (4.8-5.4 V @ Iz = 5 mA)
Power dissipation	500 mW
Test current (Iz)	5 mA
Forward voltage (Vf)	0.9 V
Package	SOD-123
Body (L×W×H)	2.65 × 1.55 × 1.35 mm

Ordering variants

Same part, different packaging or reel option.

BZT52C5V1-7-F (SOD-123, 7" reel)
BZT52C5V1-13-F (SOD-123, 13" reel)

CAD (KiCad official)

Symbol: Device:D_Zener
Footprint: Diode_SMD:D_SOD-123
3D model: SOD-123 (KiCad packages3D)

Provenance

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

Datasheet: Diodes Incorporated datasheet (5 pp, sha256 0fbd7d137524820f, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude) — every pin and dimension is cited to a datasheet page; refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF