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Contents

Pinout
Key specifications
Electrical characteristics
CAD (KiCad official)
Provenance

README

markdown

HT2785AH33RZ

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

HT2785AH33RZ 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, which must have a 2.2 µF capacitor connected from VIN to GND; the datasheet rates DC operating input up to 450 V with an absolute maximum of 700 V (1 ms peak, 650 V max peak, non-repeated).
2	GND	power_in	Ground connection, which is also the thermal tab of the SOT-89 package.
3	VOUT	power_out	Regulator output, which requires a 22 µF or larger MLCC capacitor from VOUT to GND; the absolute maximum output voltage rating is −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	25		450	V	DC	3
Output Voltage Accuracy	VOUT	3.1515	3.3	3.4485	V	TJ = 25°C, Iout = 100 A, 25 V ≤ Vin ≤ 450 V	3
Output Voltage Accuracy	VOUT	3.135	3.3	3.465	V	−40°C ≤ TJ ≤ 85°C, Iout = 100 A, 25 V ≤ Vin ≤ 450 V	3
Line Regulation	RegLINE	-0.5	0.2	0.5	%	25 V ≤ Vin ≤ 450 V, Iout = 100 A	3
Load Regulation	RegLOAD	-1	0.6	1	%	100 A ≤ IOUT ≤ 10 mA, Vin = 35 V	3
Maximum Output Current	IOUT			10.5	mA	35 V ≤ Vin ≤ 450 V	3
Quiescent Current	IQ		7.5	14	A	IOUT = 0, 25 V ≤ Vin ≤ 450 V	3
Ground Current	IGND		15		A	25 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
Noise	VNOISE		240		Vrms	f = 100 Hz to 100 kHz, Vin = 340 VDC, Iout = 100 A	3
Thermal Shutdown Temperature	TSD		145		°C	Temperature increasing from TJ = +25°C (Note 5)	3
Thermal Shutdown Hysteresis	TSDH		10		°C	Temperature falling from TSD (Note 5)	3
Input Voltage	VIN	-0.3		700	V	Note 1: peak 650 V max 1 ms non repeated for 1 s	2
Output Voltage	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 Resistance, Junction-to-Air	RJA		79		°C/W	SOT-89 package	2

CAD (KiCad official)

Symbol: HT2785AH33RZ
Footprint: Package_TO_SOT_SMD:SOT-89-3
3D model: SOT-89 (KiCad packages3D, STEP)
3D model files: ht2785ah33rz-etched.step / ht2785ah33rz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ht2785ah33rz.step / ht2785ah33rz.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