component

HT317ATZ

Public Made by Adom

by adom

HTCSEMI Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-220. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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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