HT277ARZ from HTCSEMI, 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	OUT1	output	Output of op-amp A. Rail-to-rail output swing under light load; typical source current 1.5mA, sink current 3µA. Short-circuit protected to GND.
2	-IN1	input	Inverting input of op-amp A. Very high input impedance; typical input bias current 1pA, input offset current 1pA, input offset voltage 1.5mV typ / 5mV max at VCC=3V.
3	+IN1	input	Non-inverting input of op-amp A. Input common-mode range extends from V- (0V) to VCC-1.3V.
4	V-	power_in	Negative supply / ground rail. In single-supply operation this is tied to GND. Input common-mode range includes this rail.
5	+IN2	input	Non-inverting input of op-amp B. Input common-mode range extends from V- (0V) to VCC-1.3V.
6	-IN2	input	Inverting input of op-amp B. High input impedance; ~1pA input bias current.
7	OUT2	output	Output of op-amp B. Rail-to-rail output swing under light load; short-circuit protected to GND.
8	VCC	power_in	Positive supply rail. Operating range 1.4V to 7V; absolute maximum 8.5V. Internally decouple with a ceramic capacitor to V-.

Key specifications

Parameter	Value
Manufacturer	HTCSEMI
Package	SOP-8
Category	Op-amp/Cmp
Pins	8

Ordering variants

Same part, different packaging or reel option.

HT277ARZ

CAD (KiCad official)

Symbol: HT277ARZ
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: HTCSEMI datasheet (2 pp, sha256 9624c6b783dcb12a, 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