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HT34118ARWZ

Public Made by Adom

by adom

HTCSEMI Audio Interface ICs, SOP-28. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Contents

README

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HT34118ARWZ

HTCSEMI · Audio Interface ICs · SOP-28

HT34118ARWZ from HTCSEMI, in a SOP-28. 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 FO output Filter output with output impedance less than 50 Ω.
2 FI input Filter input with input impedance greater than 1.0 MΩ.
3 CD input Chip Disable: logic low (<0.8 V) sets normal operation, logic high (>2.0 V) powers down the IC; input impedance nominally 90 kΩ.
4 VCC power_in Supply voltage of +2.8 to +6.5 V is required at about 5.0 mA; as VCC falls from 3.5 to 2.8 V an AGC reduces the receive attenuator gain by about 25 dB in receive mode.
5 HTO+ output Output of the second hybrid amplifier with gain internally set at -1.0, giving a differential output with HTO- to the hybrid transformer.
6 HTO- output Output of the first hybrid amplifier, with gain set by external resistors.
7 HTI input Input and summing node of the first hybrid amplifier; DC level is about VB.
8 TXO output Output of the transmit attenuator; DC level is approximately VB.
9 TXI input Input to the transmit attenuator; max signal level 350 mVrms, input impedance about 10 kΩ.
10 MCO output Output of the microphone amplifier, with gain set by external resistors.
11 MCI input Input and summing node of the microphone amplifier; DC level is about VB.
12 MUT input Mute input: logic low (<0.8 V) sets normal operation, logic high (>2.0 V) mutes the microphone amplifier; ground if unused.
13 VLC input Volume control input: at VLC = VB the receive attenuator is at maximum gain in receive mode, at 0.3 VB the receive gain is down 35 dB; no effect on transmit mode.
14 CT passive An RC at this pin sets the response time for the circuit to switch modes.
15 VB power_out Output voltage of about VCC/2 serving as system AC ground and biasing the volume control; a filter capacitor is required.
16 CPT passive An RC at this pin sets the time constant for the transmit background monitor.
17 TLI2 input Input to the transmit level detector on the mike/speaker side.
18 TLO2 output Output of the transmit level detector on the mike/speaker side and input to the transmit background monitor.
19 RLO2 output Output of the receive level detector on the mike/speaker side.
20 RLI2 input Input to the receive level detector on the mike/speaker side.
21 RXI input Input to the receive attenuator and dial tone detector; max input level 350 mVrms, input impedance about 10 kΩ.
22 RXO output Output of the receive attenuator; DC level is approximately VB.
23 TLI1 input Input to the transmit level detector on the line side.
24 TLO1 output Output of the transmit level detector on the line side.
25 RLO1 output Output of the receive level detector on the line side and input to the receive background monitor.
26 RLI1 input Input to the receive level detector on the line side.
27 CPR passive An RC at this pin sets the time constant for the receive background monitor.
28 GND power_in Ground pin for the entire IC.

Key specifications

Parameter Value
Manufacturer HTCSEMI
Package SOP-28
Category Communication Interface Chip/UART/485/232
Pins 28

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
Supply Voltage VCC -1 7 V 8
Storage Temperature Range Tstg -65 150 °C 8
Supply Voltage VCC 3.5 6.5 V Pin 4 9
VB Current IVB 500 µA Pin 15 9
Attenuator Input Signal Voltage VIN 0 350 mVrms Pins 9, 21 9
Microphone Amplifier, Hybrid Amplifier Gain G 0 40 dB 9
Load Current RXO, TXO IL 0 2 mA Pins 8, 22 9
Load Current MCO IL 0 1 mA Pin 10 9
Load Current HTO-, HTO+ IL 0 5 mA Pins 6, 5 9
Operating Temperature TA -25 70 °C 9
VCC Supply Current ICC 10 mA VCC =6.5 V, CD =0.8 V 9
VCC Supply Current ICC 1 mA VCC =6.5 V, CD =2.0 V 9
CD Input Resistance RCD 37.5 kΩ VCC = VCD = 6.5 V 9
CD Input High Voltage VCDH 2 V VCC = VCD = 6.5 V 9
CD Input Low Voltage VCDL 0 0.8 V VCC = VCD = 6.5 V 9
Receive Attenuator Gain GRX 1.5 10 dB Rx Mode, RXI=150 mVrms, VCC=5.0 V, f=1.0 KHz 9
Gain Change VCC=3.5 V versus VCC=5.0 V ΔGRX1 -0.5 0.5 dB @25°C 9
AGC Gain Change VCC=2.8 V versus VCC=5.0 V ΔGRX2 -15 dB @25°C 9
Receive Attenuator Idle Gain GRX1 -25 -15 dB Idle Mode, RXI=150mVrms 9
Receive Attenuator Range (Rx to Tx Mode) ΔGRX3 49 54 dB @25°C 9
Volume Control Range VCR 27 dB Rx Mode, 0.3VB<VLC<VB 9
ΔRXO DC Voltage Rx to Tx Mode ΔVRXO -190 190 mV 10
RXO High Voltage VRXOH 2.8 V IOUT= -1.0 mA,RXI=VB+1.5V, VCT=2.6 V 10
RXI Input Resistance RRXI 5.25 17.5 kΩ RXI=350 mVrms, f = 1.0 KHz 10
Transmit Attenuator Gain GTX 1.5 10 dB Tx Mode, TXI=150 mVrms, f=1.0 KHz 10
Transmit Attenuator Idle Gain GTXI -25 -15 dB Idle Mode, RXI=-150 mVrms 10
Transmit Attenuator Range (Tx to Rx Mode) ΔGTXI 49 54 dB @25°C 10
ΔTXO DC Voltage Tx to Rx Mode ΔVTXO -190 190 mV 10
TXO High Voltage VTXOH 2.8 V IOUT= -1.0 mA,TXI=VB+1.5V, VCT=1.6 V 10
TXI Input Resistance RTXI 5.25 17.5 kΩ TXI=350 mVrms, f = 1.0 KHz 10
CT Source Current (switching to Rx mode) ICTR -106 -30 µA f = 1 KHz, VLC = VB =CT 10
CT Sink Current (switching to Tx mode) ICTT 30 106 µA f = 1 KHz, VLC = VB =CT 10
CT Fast Idle Internal Resistance RFI 1.5 3.6 kΩ @25°C 10
Dial Tone Detector Threshold VDT 10 20 mV @25°C 10
Microphone Amp Output Offset MCOVOS -62 62 mV VMCO - VB, Feedback R= 180 KΩ 10
Microphone Amp Open Loop Gain AVOLM 60 dB f = 100 Hz 10
Microphone Amp Output High Voltage VMCOH 2.8 V IOUT=-1.0 mA,VMCI=VB+1.5 V 10
Microphone Amp Output Low Voltage VMCOL 250 mV IOUT=1.0 mA, VMCI=VB - 1.0 V 10
Muting (ΔGain) GMT 52 dB f = 1.0 Khz,VMCI = 150 mV, 0.8 V ≤ VMUT ≤ 2.0 V 10
MUT Input Resistance RMUT 37.5 kΩ VCC = VMUT = 6.5 V 10
MUT Input-High VMUTH 2 V 10
MUT Input-Low VMUTL 0 0.8 V 10
Hybrid Open Loop Gain AVOLH 57 dB HTI to HTO-, f = 100 Hz, VHTI = 20 mV 11
Hybrid Closed Loop Gain AVCLH -2.8 2.2 dB HTO- to HTO+ 11
HTO- High Voltage VHT-H 2.8 V IOUT=-5.0 mA, VHTI=VB -1.0 V 11
HTO- Low Voltage VHT-L 375 mV IOUT=5.0 mA, VHTI=VB +1.5 V 11
HTO+ High Voltage VHT+H 2.8 V IOUT=-5.0 mA,VHTI=VB +1.5 V 11
HTO+ Low Voltage VHT+L 562 mV IOUT=5.0 mA, VHTI=VB -1.0 V 11
Transmit-Receive Switching Threshold ITH 0.8 1.2 Ratio of Current at RLI1 + RLI2 to 20 µA at TLI1 + TLI2 to switch from Tx to Rx 11
FO Sink Current IFO 112 500 µA VB = VFO, VFI = 0 V 11

CAD (KiCad official)

  • Symbol: HT34118ARWZ
  • Footprint: Package_SO:SOP-28_8.4x18.16mm_P1.27mm
  • 3D model: SOP-28 (KiCad packages3D, STEP)
  • 3D model files: ht34118arwz-etched.step / ht34118arwz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ht34118arwz.step / ht34118arwz.glb are the bare package body.

Provenance

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

  • Datasheet: HTCSEMI datasheet (14 pp, sha256 0954d559d744c7b2, retrieved 2026-10-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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