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Contents

Pinout
Key specifications
Electrical characteristics
CAD (KiCad official)
Provenance

README

markdown

HT2785AH50RZ

HTCSEMI · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89

HT2785AH50RZ from HTCSEMI, in a SOT-89. 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	VIN	power_in	Supply voltage input with a DC operating range of 25 V to 450 V (3.3 V option) and an absolute maximum of -0.3 V to 700 V; connect a 2.2 μF capacitor from VIN to GND.
2	GND	power_in	Ground connection, which is also electrically the tab of the SOT-89 package.
3	VOUT	power_out	Regulator output providing 3.3 V, 5 V, 12 V or 15 V at up to 10 mA; connect 22 μF or larger MLCC capacitor from VOUT to GND, with absolute maximum rating of -0.3 V to 18 V.

Key specifications

Parameter	Value
Manufacturer	HTCSEMI
Package	SOT-89
Category	Power Management (PMIC)
Pins	3

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Operating Input Voltage DC	VIN	50		450	V		3
Output Voltage Accuracy (TJ = 25°C)	VOUT	4.775	5	5.225	V	TJ = 25°C, Iout = 100 A, 50 V ≤ Vin ≤ 450 V	3
Output Voltage Accuracy (−40°C ≤ TJ ≤ 85°C)	VOUT	4.75	5	5.25	V	−40°C ≤ TJ ≤ 85°C, Iout = 100 A, 50 V ≤ Vin ≤ 450 V	3
Line Regulation	RegLINE	-0.5	0.2	0.5	%	50 V ≤ Vin ≤ 450 V, Iout = 100 A	3
Load Regulation	RegLOAD	-1	0.62	1	%	100 A ≤ IOUT ≤ 10 mA, Vin = 55 V	3
Maximum Output Current	IOUT			10.5	mA	55 V ≤ Vin ≤ 450 V	3
Quiescent Current	IQ	16		21	A	IOUT = 0, 50 V ≤ Vin ≤ 450 V	3
Ground Current	IGND			23	A	50 V ≤ Vin ≤ 450 V, 0 < IOUT ≤ 10 mA	3
Power Supply Rejection Ratio	PSRR	70			dB	Vin = 340 VDC +1 Vpp modulation, Iout = 100 A, f = 1 kHz	3
Output Noise	VNOISE			300	Vrms	f = 100 Hz to 100 kHz, Vin = 340 VDC, Iout = 100 A	3
Input Voltage (absolute maximum)	VIN	-0.3		700	V	Note 1	2
Output Voltage (absolute maximum)	VOUT	-0.3		18	V		2
Maximum Junction Temperature	TJ(MAX)			150	°C		2
Storage Temperature	TSTG	-55		150	°C		2
ESD Capability, Human Body Model	ESDHBM			2000	V	All pins except HV pin no.1 (Note 2)	2
ESD Capability, Machine Model	ESDMM			200	V	Note 2	2
Thermal Shutdown Temperature	TSD		145		°C	Temperature increasing from TJ = +25°C	3
Thermal Shutdown Hysteresis	TSDH		10		°C	Temperature falling from TSD	3
Thermal Resistance, Junction-to-Air	RJA		79		°C/W		2

CAD (KiCad official)

Symbol: HT2785AH50RZ
Footprint: Package_TO_SOT_SMD:SOT-89-3
3D model: SOT-89 (KiCad packages3D, STEP)
3D model files: ht2785ah50rz-etched.step / ht2785ah50rz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ht2785ah50rz.step / ht2785ah50rz.glb are the bare package body.

Provenance

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

Datasheet: HTCSEMI datasheet (14 pp, sha256 94901f0a04ddd533, retrieved 2026-11-05, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-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