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Contents

Pinout
Key specifications
Electrical characteristics
CAD (KiCad official)
Provenance

README

markdown

HT317ATZ

HTCSEMI · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-220

HT317ATZ from HTCSEMI, in a TO-220. 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	ADJ/GND	passive	Adjustment pin; connects to the R1/R2 divider that sets the output voltage (Vout = 1.25 V(1+R2/R1) + IADJ*R2), with IADJ typically 50 µA and max 100 µA.
2	Output	power_out	Regulated output, adjustable from 1.2 V to 37 V at more than 1.5 A; the heatsink tab is connected to this pin.
3	Input	power_in	Unregulated input; the input-output voltage differential must not exceed 40 V.

Key specifications

Parameter	Value
Manufacturer	HTCSEMI
Package	TO-220
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
Input-Output Voltage Differential	Vi - Vo			40	Vdc		2
Operating Junction Temperature Range	TJ	-40		150	C		2
Storage Junction Temperature Range	Tstg	-65		150	C		2
Line Regulation (TA=+25C)	Regline		0.01	0.04	%/V	3.0 V ≤ Vi - Vo ≤ 40 V, TA=+25C	3
Load Regulation (TJ=+25C)	Regload		5	25	mV	10mA ≤ Io ≤ Imax, Vin 5V	3
Load Regulation (TJ=+25C)	Regload		0.1	0.5	%	10mA ≤ Io ≤ Imax, Vin5 V	3
Thermal Regulation (TA=+25C)			0.03	0.07	%/W	TA=+25C, 20 ms pulse	3
Adjustment Pin Current	IAdj		50	100	µA		3
Adjustment Pin Current Change	IAdj		0.2	5	µA	2.5 V ≤ Vi - Vo ≤ 40 V, 10mA ≤ IL ≤ Imax, PD ≤ Pmax	3
Reference Voltage (Note 4)	Vref	1.2	1.25	1.3	V	3.0 V ≤ Vi - Vo ≤ 40 V, 10mA ≤ IL ≤ Imax, PD ≤ Pmax	3
Line Regulation (Note 3)	Regline		0.02	0.07	%/V	3.0 V ≤ Vi - Vo ≤ 40 V	3
Load Regulation (Note 3)	Regload		20	70	mV	10mA ≤ Io ≤ Imax, Vin 5V	3
Load Regulation (Note 3)	Regload		0.3	1.5	%	10mA ≤ Io ≤ Imax, Vin5 V	3
Minimum Load Current to Maintain Regulation	ILmin		3.5	10	mA	Vi - Vo = 40 V	3
Maximum Output Current	Imax	1.5	2.2		A	Vi - Vo ≤ 15 V, P ≤ 20 W	3
Maximum Output Current	Imax	0.15	0.4		A	Vi - Vo = 40 V, P ≤ 20 W, TA=+25C	3
Ripple Rejection (with Cadj)	RR	65	80		dB	Cadj = 10 µF, Vo = 10 V, f = 120 Hz (Note 5)	3
Long-Term Stability	S		0.3	1	%/1.0 k Hrs.	Tj = Thigh (Note 6), TA=+25C for endpoint measurements	3
Temperature Stability	Ts		0.7			Tlow ≤ Tj ≤ Thigh	3
Ripple Rejection (without Cadj)	RR		66		dB	Without Cadj, Vo = 10 V, f = 120 Hz (Note 5)	3
RMS Noise, % of Vo	N		0.003		% of Vo	TA=+25C, 10 Hz ≤ f ≤ 10 kHz	3
Thermal Resistance Junction to Case	RJC		5		°C/W		3

CAD (KiCad official)

Symbol: HT317ATZ
Footprint: Package_TO_SOT_THT:TO-220-3_Vertical
3D model: TO-220 (KiCad packages3D, STEP)
3D model files: ht317atz-etched.step / ht317atz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ht317atz.step / ht317atz.glb are the bare package body.

Provenance

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

Datasheet: HTCSEMI datasheet (6 pp, sha256 cb20a4cdbb6ac2d3, retrieved 2026-10-18, 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