Part of the Day · BC847 — SOT-23 NPN general-purpose transistor (marking 1H)

Part of the Day · 2026-10-27

One of the most common 45V/100mA-class SMD NPN small-signal transistors. It is often found amplifying signals or switching LEDs and other small loads, and is marked 1H plus a one-letter factory code.

Actual size

↓ Actual size, left edge aligned to 0 on the ruler

One ruler tick = 1mm. On PC this is actual size on a 24-inch FHD monitor at 100% zoom; on iPhone it adjusts automatically. For other screens, use “Calibrate ruler” below.

Enlarged (SOT-23 · top view · approx. 20×)

Pins 1 Base · 2 Emitter · 3 Collector

Package SOT-23 · Marking 1H

Key specifications

Values are from the Nexperia datasheet.

Marking and pins

Marking code 1H · Pins 1 Base · 2 Emitter · 3 Collector

Typical uses

• General-purpose signal amplification — small signals such as sensor and audio front ends
• General-purpose switching — drivers for loads of 100mA or less such as LEDs and small relays

Companion & similar parts

• BC857 — PNP complement (stated in the datasheet) — opposite polarity, not a substitute
• BC847C — Gain-grade version of the same BC847 (hFE 420~800, marking code 1G)
• BC817 — Also a SOT-23 NPN, but a larger 500mA type

The Nexperia marking code is 1H followed by a one-letter factory code (1H%). The A, B and C grades use different codes (1E, 1F, 1G), and other makers may use different codes.