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HT8487EARZ

HTCSEMI · RS-485/RS-422 ICs · SOP-8

HT8487EARZ from HTCSEMI, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	RO	output	Receiver output, three-state, high when A-B ≥ +0.2V or the inputs are open, low when A-B ≤ -0.2V, and high-impedance when RE is high.
2	RE	input	Receiver output enable, active low; RO is enabled when RE is 0 and high-impedance when RE is 1, with input thresholds VIH 2.0V min and VIL 0.8V max.
3	DE	input	Driver output enable, active high; driver outputs are enabled when DE is 1 and high-impedance when DE is 0, with VIH 2.0V min and VIL 0.8V max.
4	DI	input	Driver input; a low on DI forces the non-inverting driver output low and a high forces it high when DE is high, with VIH 2.0V min and VIL 0.8V max.
5	GND	power_in	Ground reference for the device; all voltages are referenced to device ground.
6	A	bidirectional	Non-inverting receiver input and driver output on the RS-485/RS-422 bus, with -7V to +12V common-mode input range and ±15kV HBM ESD protection.
7	B	bidirectional	Inverting receiver input and driver output on the RS-485/RS-422 bus, with -7V to +12V common-mode input range and ±15kV HBM ESD protection.
8	VCC	power_in	Positive supply input, operated from a single 5V ±5% supply with an absolute maximum of 12V.

Key specifications

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

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Differential Driver Output (with load) RS-422	VOD2	2			V	R = 50Ω (RS-422)	2
Differential Driver Output (with load) RS-485	VOD2	1.5		5	V	R = 27Ω (RS-485), Figure 4	2
Change in Magnitude of Driver Differential Output Voltage	∆VOD			0.2	V	R = 27Ω or 50Ω, Figure 4	2
Change in Magnitude of Driver Common-Mode Output Voltage	∆VOC			0.2	V	R = 27Ω or 50Ω, Figure 4	2
Input High Voltage	VIH	2			V	DE, DI, RE	2
Input Low Voltage	VIL			0.8	V	DE, DI, RE	2
Input Current	IIN1	-2		2	µA	DE, DI, RE	2
Receiver Differential Threshold Voltage	VTH	-0.2		0.2	V	-7V ≤ VCM ≤12V	2
Receiver Output High Voltage	VOH	3.5			V	IO = -4mA, VID = 200mV	2
Receiver Output Low Voltage	VOL			0.4	V	IO = 4mA, VID = -200mV	2
Three-State Output Current at Receiver	IOZR	-1		1	µA	0.4V ≤ VO ≤ 2.4V	2
No-Load Supply Current, DE = VCC	ICC		500	900	µA	DE = VCC	2
No-Load Supply Current, DE = 0V	ICC		300	500	µA	DE = 0V	2
Driver Short-Circuit Current, VO = High	IOSD1	35		250	mA	-7V ≤ VO ≤ 12V (Note 4)	2
Driver Short-Circuit Current, VO = Low	IOSD2	35		250	mA	-7V ≤ VO ≤12V (Note 4)	2
Receiver Short-Circuit Current	IOSR	7		95	mA	0V ≤ VO ≤ VCC	2
Driver Input to Output tPLH	tPLH	10	30	60	ns	RDIFF = 54, CL1 = CL2 = 100pF	3
Driver Input to Output tPHL	tPHL	10	30	60	ns	RDIFF = 54, CL1 = CL2 = 100pF	3
Driver Output Skew	tSKEW		5	10	ns	RDIFF = 54, CL1 = CL2 = 100pF	3
Driver Enable to Output High	tZH		40	70	ns	CL= 100pF, S2 closed	3
Driver Enable to Output Low	tZL		40	70	ns	CL= 100pF, S1 closed	3
Driver Disable Time from Low	tLZ		40	70	ns	CL= 15pF, S1 closed	3
Driver Disable Time from High	tHZ		40	70	ns	CL= 15pF, S2 closed	3
Receiver Enable to Output Low	tZL		20	50	ns	CRL = 15pF, S1 closed	3
Receiver Enable to Output High	tZH		20	50	ns	CRL = 15pF, S2 closed	3
Receiver Disable Time from Low	tLZ		20	50	ns	CRL = 15pF, S1 closed	3
Receiver Disable Time from High	tHZ		20	50	ns	CRL = 15pF, S2 closed	3
Differential Receiver Skew	tSKD			13	ns	RDIFF = 54, CL1 = CL2 = 100pF	3
Maximum Data Rate	fMAX	2.5			Mbps		3
Differential Driver Output (no load)	VOD1			5	V		2
Driver Common-Mode Output Voltage	VOC			3	V	R = 27Ω or 50Ω, Figure 4	2
Receiver Input Hysteresis	∆VTH		70		mV	VCM = 0V	2
Supply Voltage	VCC			12	V		1
Driver Output Voltage (A, B)		-8		12.5	V		1
Receiver Input Voltage (A, B)		-8		12.5	V		1
Continuous Power Dissipation 8-Pin SO				471	mW	derate 5.88mW/°C	1
Operating Temperature Range		-40		85	°C		1
Storage Temperature Range		-65		160	°C		1
Lead Temperature (soldering, 10sec)				300	°C		1

CAD (KiCad official)

Symbol: HT8487EARZ
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)
3D model files: ht8487earz-etched.step / ht8487earz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ht8487earz.step / ht8487earz.glb are the bare package body.

Provenance

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

Datasheet: HTCSEMI datasheet (5 pp, sha256 8a8f03b673f18fb4, retrieved 2026-10-26, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF