HT6873B5SPNR from Jiaxing Heroic Elec Tech HT6873, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	CTRL	input	Shutdown and ACF mode control terminal. Voltage on CTRL selects operating mode: ≥2.00 V = ACF-Off, 1.55-1.85 V = ACF-1 (~3% max THD+N), 1.10-1.40 V = ACF-2 (~10% max THD+N), and ≤0.30 V = Shutdown. Typically driven from VDD via a switch with an external pull-down resistor (RPD).
2	BYPASS	passive	Analog reference / mid-supply bypass terminal. Nominal voltage is VDD/2. Bypass to GND with a 1 µF capacitor (CB) for PSRR and low-noise performance.
3	IN-	input	Negative differential audio input. AC-couple through CIN (1 µF) and series RIN (12 kΩ) to the source (or to ground for single-ended input).
4	IN+	input	Positive differential audio input. AC-couple through CIN (1 µF) and series RIN (12 kΩ) to the audio source. Voltage gain Av = 25.5 dB with RIN = 12 kΩ.
5	OUT+	output	Positive Class-D BTL output. Connects directly to one speaker terminal (filter-less). Switching carrier is ~470 kHz PWM.
6	VDD	power_in	Power supply input. Recommended 2.5 V to 6 V (typ. 5 V); absolute max 6.5 V. Decouple with 220 µF (CS2) bulk and 1 µF (CS1) ceramic to GND close to the pin.
7	GND	power_in	Device ground / VSS. Common return for power supply, input coupling, and CTRL pull-down.
8	OUT-	output	Negative Class-D BTL output. Connects directly to the other speaker terminal (filter-less). Together with OUT+ forms the bridge-tied load driving the speaker.

Key specifications

Parameter	Value
Manufacturer	Jiaxing Heroic Elec Tech HT6873
Package	SOP-8
Category	Op-amp/Cmp
Pins	8

Ordering variants

Same part, different packaging or reel option.

HT6873B5SPNT
HT6873B5SPNR
HT6873B5SPET
HT6873B5SPER

CAD (KiCad official)

Symbol: HT6873B5SPNR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ht6873b5spnr.step`	122 KB	You want the bare part, or you mark your own boards.
`ht6873b5spnr-etched.step`	2.7 MB	You want the part with `HT6873B5SPNR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 648 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: Jiaxing Heroic Elec Tech HT6873 datasheet (16 pp, sha256 1e59a0341bfd7353, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF