HT6508ARZ 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	RO	output	Receiver Output. Logic-level output of the differential receiver comparing A and B. High when A-B > +0.2V, low when A-B < -0.2V; fail-safe high when inputs are open. High-impedance when RE is high. VOH ≥ 2.5V at Io = -1.5mA; VOL ≤ 0.4V at Io = 2.5mA.
2	/RE	input	Receiver Output Enable, active low. Drive low to enable the receiver output RO; drive high to place RO in high-impedance state. TTL/CMOS compatible input (VIH ≥ 2.0V, VIL ≤ 0.8V).
3	DE	input	Driver Output Enable, active high. Drive high to enable driver outputs A and B; drive low to place driver outputs in high-impedance state. TTL/CMOS compatible input (VIH ≥ 2.0V, VIL ≤ 0.8V).
4	DI	input	Driver Input. Logic-level input to the differential driver. When DE=1: DI=0 forces A=0/B=1, DI=1 forces A=1/B=0. TTL/CMOS compatible (VIH ≥ 2.0V, VIL ≤ 0.8V).
5	GND	power_in	Ground reference. All voltages are referenced to this pin.
6	A	bidirectional	Non-inverting Driver Output / Non-inverting Receiver Input (RS-485/RS-422 bus line A). Withstands -7V to +12V common-mode; input resistance ≥12kΩ. Short-circuit current limited to 250mA over -7V ≤ Vo ≤ 12V; protected by thermal shutdown.
7	B	bidirectional	Inverting Driver Output / Inverting Receiver Input (RS-485/RS-422 bus line B). Withstands -7V to +12V common-mode; input resistance ≥12kΩ. Short-circuit current limited to 250mA over -7V ≤ Vo ≤ 12V; protected by thermal shutdown.
8	VCC	power_in	Supply voltage input. Single 3.3V ±0.3V supply. No-load quiescent supply current typically 120µA (RE=0V, DE=0V). Absolute maximum 7V.

Key specifications

Parameter	Value
Manufacturer	HTCSEMI
Package	SOP-8
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

HT6508ARZ
HT6508ARZANZ
HT6508ARZARMZ

CAD (KiCad official)

Symbol: HT6508ARZ
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 (8 pp, sha256 0ee06570b6c5b4de, 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