component
HT34118ANZ
Public Made by Adomby adom
HTCSEMI Audio Interface ICs, DIP-28. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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Datasheet
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README
markdownHT34118ANZ
HTCSEMI · Audio Interface ICs · DIP-28
HT34118ANZ from HTCSEMI, in a DIP-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 at about 5.0 mA; as VCC falls from 3.5 to 2.8 V an AGC circuit reduces 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 for 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 with max signal level 350 mVrms and 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 without affecting the rest of the circuit. |
| 13 | VLC | input | Volume control input: when VLC = VB the receive attenuator is at maximum gain in receive mode, and at 0.3 VB the receive gain is down 35 dB; no effect in 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 with max input level 350 mVrms and 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 | DIP-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 |
|---|---|---|---|---|---|---|---|
| VCC Supply Current (CD=0.8V) | ICC | 10 | mA | VCC=6.5 V, CD=0.8 V | 9 | ||
| VCC Supply Current (CD=2.0V) | 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 | 6.5 | V | VCC = VCD = 6.5 V; max printed as VCC | 9 | |
| CD Input Low Voltage | VCDL | 0 | 0.8 | V | VCC = VCD = 6.5 V | 9 | |
| VB Output Voltage | VB | 13.5 | 3 | V | 9 | ||
| Volume Control Range | VCR | 27 | dB | Rx Mode, 0.3VB<VLC<VB | 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=3.5V vs 5.0V | ΔGRX1 | -0.5 | 0.5 | dB | @25°C | 9 | |
| AGC Gain Change VCC=2.8V vs 5.0V | ΔGRX2 | -15 | dB | @25°C | 9 | ||
| Idle Mode Receive Gain | GRX1 | -25 | -15 | dB | Idle Mode, RXI=150mVrms | 9 | |
| Receive Attenuator Range | ΔGRX3 | 49 | 54 | dB | Range (Rx to Tx Mode), @25°C | 9 | |
| ΔRXO DC Voltage | ΔVRXO | -190 | 190 | mV | Rx to Tx Mode | 10 | |
| RXO High Voltage | VRXOH | 2.8 | V | IOUT=-1.0 mA, RXI=VB+1.5V, VCT=2.6 V | 10 | ||
| RXO Low Voltage | VRXOL | -0.75 | V | IOUT=+1.0 mA, RXI=VB-1.0V, VCT=2.6 V; measured with respect to VB (printed VB-0.75) | 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 Idle Gain | GTXI | -25 | -15 | dB | Idle Mode, RXI=-150 mVrms | 10 | |
| Transmit Attenuator Range | ΔGTXI | 49 | 54 | dB | Range (Tx to Rx Mode), @25°C | 10 | |
| ΔTXO DC Voltage | ΔVTXO | -190 | 190 | mV | Tx to Rx Mode | 10 | |
| TXO High Voltage | VTXOH | 2.8 | V | IOUT=-1.0 mA, TXI=VB+1.5V, VCT=1.6 V | 10 | ||
| TXO Low Voltage | VTXOL | -0.75 | V | IOUT=+1.0 mA, TXI=VB-1.0V, VCT=1.6 V; measured with respect to VB (printed VB-0.75) | 10 | ||
| TXI Input Resistance | RTXI | 5.25 | 17.5 | kΩ | TXI=350 mVrms, f=1.0 kHz | 10 | |
| CT Source Current | ICTR | -106 | -30 | µA | f=1 kHz, VLC=VB=CT, switching to Rx mode | 10 | |
| CT Sink Current | ICTT | 30 | 106 | µA | f=1 kHz, VLC=VB=CT, switching to Tx mode | 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 | |
| Mic Amp Open Loop Gain | AVOLM | 60 | dB | f=100 Hz | 10 | ||
| Mic Amp Output High Voltage | VMCOH | 2.8 | V | IOUT=-1.0 mA, VMCI=VB+1.5 V | 10 | ||
| Mic 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 | 6.5 | V | max printed as VCC | 10 | |
| MUT Input Low | VMUTL | 0 | 0.8 | V | 10 | ||
| HTO- Offset | HVOS | -25 | 25 | mV | VHTO- - VB, Feedback R=51 kΩ (printed VB-25 / VB+25) | 11 | |
| HTO- to HTO+ Offset | HBVOS | -37 | 37 | mV | Feedback R=51 kΩ (printed VB-37 / VB+37) | 11 | |
| 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; @25°C | 11 | ||
| Voltage Offset at FO | FOVOS | -250 | 25 | mV | VFO-VB, 220 kΩ from VB to FI (printed VB-250 / VB+25) | 11 | |
| FO Sink Current | IFO | 112 | 500 | µA | VB=VFO, VFI=0 V | 11 | |
| Supply Voltage (recommended) | VCC | 3.5 | 6.5 | V | Pin 4 | 9 | |
| Input Voltage at CD, MUT | VIN | 0 | 6.5 | V | max printed as VCC | 9 | |
| VB Current | IVB | 500 | µA | Pin 15 | 9 | ||
| Attenuator Input Signal Voltage | VIN | 0 | 350 | mVrms | Pins 9, 21 | 9 | |
| Mic/Hybrid Amplifier Gain | G | 0 | 40 | dB | 9 | ||
| Operating Temperature | TA | -25 | 70 | °C | 9 | ||
| Supply Voltage (absolute max) | VCC | -1 | 7 | V | 8 | ||
| Input Voltage at CD, MUT | VIN | -1 | V | -1.0 to VCC+1.0 V | 8 | ||
| Storage Temperature Range | Tstg | -65 | 150 | °C | 8 |
CAD (KiCad official)
- Symbol:
HT34118ANZ - Footprint:
Package_DIP:DIP-28_W7.62mm - 3D model: DIP-28 (KiCad packages3D, STEP)
- 3D model files:
ht34118anz-etched.step/ht34118anz-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ht34118anz.step/ht34118anz.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: HTCSEMI datasheet (14 pp, sha256
0954d559d744c7b2, retrieved 2026-10-24, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).