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MC34118G-S28-R
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UTC(Unisonic Tech) Audio Power OpAmps, SOP-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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Symbol & Footprint
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README
markdownMC34118G-S28-R
UTC(Unisonic Tech) · Audio Power OpAmps · SOP-28-300mil
MC34118G-S28-R from UTC(Unisonic Tech), in a SOP-28-300mil. 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 | Output of the filter, with output impedance less than 50Ω. |
| 2 | FI | input | Input of the filter, with input impedance less than 1MΩ. |
| 3 | CD | input | Chip disable input: logic low below 0.8V sets normal operation and logic high above 2V disables the IC, with a nominal input impedance of 90 kΩ. |
| 4 | VCC | power_in | Requires a supply voltage of +2.8V to +6.5V at 5mA, and an AGC circuit reduces receive attenuator gain by 25dB when VCC falls below 3.5V in receive mode. |
| 5 | HTO+ | output | Output of the second hybrid amplifier, whose gain is internally set at -1. |
| 6 | HTO- | output | Output of the first hybrid amplifier, whose gain is set by external resistors. |
| 7 | HTI | input | Input and summing node of the first hybrid amplifier, with DC level about equal to VB. |
| 8 | TXO | output | Output of the transmit attenuator, with DC level about VB. |
| 9 | TXI | input | Input of the transmit attenuator, with maximum signal level of 350 mVrms and input impedance of 10 kΩ. |
| 10 | MCO | output | Output of the microphone amplifier, whose gain is set by external resistors, with load current of 0 to ±1 mA. |
| 11 | MCI | input | Summing node input of the microphone amplifier, with DC level VB. |
| 12 | MUT | input | Mute input: logic low below 0.8V gives normal operation and logic high above 2V mutes the microphone amplifier, with input impedance of 90 kΩ. |
| 13 | VLC | input | Volume control input sensed with respect to VB, with recommended operating range 0.3×VB to VB. |
| 14 | CT | passive | Sets the response time for switching modes through the RC network connected at this pin. |
| 15 | VB | power_out | Outputs about Vcc/2 as the system AC ground that biases the volume control, and requires a filter capacitor. |
| 16 | CPT | passive | Sets the time constant for the transmit background noise monitor through the RC at this pin. |
| 17 | TLI2 | input | Input to the transmit level detector on the microphone/speaker side. |
| 18 | TLO2 | output | Output of the transmit level detector on the microphone/speaker side, and also the input to the transmit background noise monitor. |
| 19 | RLO2 | output | Output of the receive level detector on the microphone/speaker side. |
| 20 | RLI2 | input | Input to the receive level detector on the microphone/speaker side. |
| 21 | RXI | input | Input to the receive attenuator and dial tone detector, with maximum input level of 350 mVrms and input impedance of 10 kΩ. |
| 22 | RXO | output | Output of the receive attenuator, with DC level 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, and also the input to the transmit background noise monitor. |
| 25 | RLO1 | output | Output of the receive level detector on the line side. |
| 26 | RLI1 | input | Input to the receive level detector on the line side. |
| 27 | CPR | passive | Sets the time constant for the receive background noise monitor through the RC at this pin. |
| 28 | GND | power_in | Ground. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC(Unisonic Tech) |
| Package | SOP-28-300mil |
| Category | Amplifiers |
| 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 | 5 | ||
| Voltage at Pin 3 | V3 | -1 | V | Upper limit printed as VCC+1 | 5 | ||
| Voltage at Pin 12 (mute) | V12 | -1 | V | Upper limit printed as VCC+1 | 5 | ||
| Voltage at Pin 13 (VLC) | V13 | -1 | V | Upper limit printed as VCC+0.5 | 5 | ||
| Voltage at Pin 9, Pin 21, and Pin 2 | V9, 21, 2 | -0.5 | V | Upper limit printed as VCC+0.5 | 5 | ||
| Storage Temperature | TSTR | -65 | 150 | °С | 5 | ||
| Supply Voltage | V4 | 3.5 | 6.5 | V | 5 | ||
| Voltage at Pin 3 | V3 | 0 | V | Upper limit printed as VCC | 5 | ||
| Voltage at Pin 12 (MUTE) | V12 | 0 | V | Upper limit printed as VCC | 5 | ||
| IVB Current (Pin 15) | IVB | 500 | µA | 5 | |||
| Attenuator Input Signal Voltage at Pin 9, Pin 21 | V9, V21 | 350 | mVrms | 5 | |||
| Load Current RXO, TXO (Pin 8, Pin 22) | -2 | 2 | mA | Printed as 0~+-2 mA | 5 | ||
| Load Current MCO (Pin 10) | -1 | 1 | mA | Printed as 0~+-1 mA | 5 | ||
| Load Current HTO-, HTO+ (Pin 6, Pin 5) | -0.5 | 0.5 | mA | Printed as 0~+-0.5 mA | 5 | ||
| Ambient Operating Temperature | TOPR | -20 | 60 | °С | 5 | ||
| V+ Supply Current | ICC | 5.5 | 8 | mA | VCC=6.5V, CD=0.8V | 5 | |
| V+ Supply Current | ICC | 600 | 800 | µA | VCC=6.5V, CD=2V | 5 | |
| CD Input Resistance | RCD | 50 | 90 | kΩ | VCC=VCD=6.5V | 5 | |
| CD High Input Voltage | VCDH | 2 | V | Printed as 2 VCC | 5 | ||
| CD Low Input Voltage | VCDL | 0.8 | V | 5 | |||
| VB Output Voltage | VB | 1.8 | 2.1 | 2.4 | V | VCC=5V | 5 |
| Gain RX Mode, RXI=150mVrms | GRX | 4 | 6 | 8 | dB | VCC=5V | 5 |
| Gain Change | GRX1 | -0.5 | 0 | 0.5 | dB | VCC=3.5V vs. VCC=5V | 5 |
| AGC Gain Change | GRX2 | -25 | -15 | dB | VCC=3.5V vs. VCC=5V | 5 | |
| Idle Mode Gain, RXI=150mVrms | GRXI | -22 | -20 | -17 | dB | Idle Mode, RXI=150mVrms | 5 |
| RX to TX Mode Range | GRX3 | 49 | 52 | 54 | dB | (f=1kHz, VLC=VB) | 5 |
| Volume Control Range | VCR | 27 | 35 | dB | 5 | ||
| RXO Low Voltage | VRXOL | -1.5 | -1 | V | IOUT=+1mA, RXI=VB-1V, output measured with respect to VB | 5 | |
| RXI Input Resistance | RRXI | 7 | 10 | 14 | kΩ | RXI<350mVrs | 5 |
| Transmit Attenuator Gain | GTX | 4 | 6 | 8 | dB | TX Mode, TXI=150mVrms (f=1kHz) | 6 |
| Idle Mode Gain, TXI=150mVrms | GTXI | -22 | -20 | -17 | dB | Idle Mode, TXI=150mVrms | 6 |
| TX to RX Mode Range | GTXI | 49 | 52 | 54 | dB | 6 | |
| TXI Input Resistance | RTXI | 7 | 10 | 14 | kΩ | TXI<350mVrs | 6 |
| Gain Tracking | GTR | -0.1 | 0.1 | dB | GRX+GTX, @TX, IDIE, RX | 6 | |
| CT Source Current (Switching to RX Mode) | ICTR | -85 | -60 | -40 | µA | Switching to RX Mode | 6 |
| CT Sink Current (Switching to TX Mode) | ICTT | 40 | 60 | 85 | µA | Switching to TX Mode | 6 |
| CT Fast Idle Internal Resistance | RFI | 1.5 | 2 | 3.6 | kΩ | 6 | |
| Dial Tone Detector Threshold | VDT | 10 | 15 | 20 | mV | 6 | |
| Output Offset | MCOVOS | -50 | 0 | 50 | mV | VMCO-VB, RF=180 kΩ | 6 |
| Open Loop Gain | AVOLM | 70 | 80 | dB | F<100Hz | 6 | |
| MUT Input Resistance | RMUT | 50 | 90 | kΩ | VCC=VMUT=6.5V | 6 | |
| MUT High Input Voltage | VMUTH | 2 | V | Printed as 2 Vcc | 6 | ||
| MUT Low Input Voltage | VMUTL | 0 | 0.8 | V | 6 | ||
| HTO- Offset | HVOS | -20 | 0 | 20 | mV | VHTO-~VB, RF=51kΩ | 6 |
| HTO- to HTO+ Offset | HBVOS | -30 | 0 | 30 | mV | RF =51kΩ | 6 |
| Open Loop Gain | AVOLH | 60 | 80 | dB | HTI to HTO-, F<100Hz | 6 | |
| Closed Loop Gain | AVCLH | -0.35 | 0 | 0.35 | dB | HTO- to HTO+ | 6 |
| Transmit-Receive Switching Threshold ratio | ITH | 0.8 | 1 | 1.2 | Ratio of current at RLI1+RLI2 to 20A at TLI1+TLI2 to switch from Tx to Rx | 7 | |
| Voltage Offset at FO | FOVOS | -200 | -90 | 0 | mV | VFO-VB, 220kΩ from VB to FI | 7 |
| FO Sink Current | IFO | 150 | 260 | 400 | µA | 7 | |
| System Distortion RX Mode (f=1kHz) | THDR | 0.5 | 3 | % | from FI to RXO, FO connected to RXI | 7 | |
| System Distortion TX Mode (f=1kHz) | THD | 0.8 | 3 | % | from MCI to HTO-/HTO+, includes TX attenuator | 7 | |
| VCC Supply Current temperature coefficient | -0.3 | %/°С | CD=0.8V | 7 | |||
| VCC Supply Current temperature coefficient | -0.4 | %/°С | CD=2V | 7 | |||
| VB Output Voltage temperature coefficient | VB | 0.8 | %/°С | VCC=5V | 7 | ||
| Attenuator Gain temperature coefficient (Max Gain) | 0.0008 | dB/°С | Max Gain | 7 | |||
| Dial Tone Detector Threshold temperature coefficient | 20 | µV/°С | 7 |
CAD (KiCad official)
- Symbol:
MC34118G-S28-R - Footprint:
Package_SO:SOP-28_8.4x18.16mm_P1.27mm - 3D model: SOP-28-300mil (KiCad packages3D, STEP)
- 3D model files:
mc34118g-s28-r-etched.step/mc34118g-s28-r-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mc34118g-s28-r.step/mc34118g-s28-r.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UTC(Unisonic Tech) datasheet (15 pp, sha256
74431b3e974e485c, retrieved 2026-10-26, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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).